/* ==============================================================
   style.css — 日本電池再生株式会社 トップページ
   カラー設計：白・紺・グレー + 環境グリーン（アクセント）
   ============================================================== */

/* ==============================
   1. CSS Custom Properties
   ============================== */
:root {
  /* Colors */
  --navy:          #0C2340;
  --navy-mid:      #153660;
  --navy-light:    #1C4880;
  --navy-deep:     #071828;
  --white:         #FFFFFF;
  --off-white:     #F5F7FA;
  --gray-50:       #F8F9FB;
  --gray-100:      #EFF2F6;
  --gray-200:      #DDE2EA;
  --gray-300:      #C4CCd6;
  --gray-400:      #98A4B3;
  --gray-500:      #677485;
  --gray-600:      #4A5668;
  --gray-700:      #333E4D;
  --gray-900:      #181F2A;
  --green:         #1A7A42;
  --green-mid:     #22964F;
  --green-light:   #2DB360;
  --green-pale:    #E6F4EC;
  --green-border:  rgba(26,122,66,.25);
  --text:          #1C2733;
  --text-mid:      #3D4F62;
  --text-light:    #5A6B7D;
  --text-muted:    #8A97A5;
  --danger:        #C0392B;

  /* Typography */
  --font-sans:  'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'YuGothic', 'Yu Gothic', 'Meiryo', sans-serif;
  --font-serif: 'Noto Serif JP', 'Hiragino Mincho ProN', 'Yu Mincho', 'YuMincho', Georgia, serif;

  /* Spacing */
  --container-max: 1180px;
  --section-py:    clamp(64px, 8vw, 108px);

  /* Radius */
  --r-sm:  4px;
  --r-md:  8px;
  --r-lg:  14px;
  --r-xl:  20px;

  /* Shadows */
  --shadow-xs: 0 1px 3px rgba(12,35,64,.06);
  --shadow-sm: 0 2px 8px rgba(12,35,64,.08);
  --shadow-md: 0 6px 24px rgba(12,35,64,.11);
  --shadow-lg: 0 12px 48px rgba(12,35,64,.15);

  /* Transitions */
  --ease: .26s cubic-bezier(.4,0,.2,1);

  /* Header */
  --banner-h:   36px;
  --header-h: 82px;
}

/* ==============================
   2. Reset & Base
   ============================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--white);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body.nav-open { overflow: hidden; }

img, video { max-width: 100%; height: auto; display: block; }

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--ease);
}

ul, ol { list-style: none; }

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

h1, h2, h3, h4, h5, h6 { line-height: 1.35; }

/* ==============================
   3. Layout Utilities
   ============================== */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 48px);
}

.section {
  padding-block: var(--section-py);
}

.bg-white  { background: var(--white); }
.bg-light  { background: var(--off-white); }
.bg-navy   { background: var(--navy); }
.bg-gray-900 { background: var(--gray-900); }

/* ==============================
   4. Section Header
   ============================== */
.section-header {
  text-align: center;
  margin-bottom: clamp(44px, 6vw, 72px);
}

.section-eyebrow {
  display: inline-block;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--green);
  border: 1px solid var(--green);
  padding: 4px 14px;
  border-radius: var(--r-sm);
  margin-bottom: 14px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.55rem, 3.5vw, 2.4rem);
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 18px;
  letter-spacing: -.01em;
}

.section-lead {
  font-size: clamp(.92rem, 1.5vw, 1.05rem);
  color: var(--text-light);
  line-height: 1.95;
  max-width: 680px;
  margin-inline: auto;
}

/* Light variant (on dark bg) */
.section-header.light .section-eyebrow {
  color: var(--green-light);
  border-color: var(--green-light);
}
.section-header.light .section-title { color: var(--white); }
.section-header.light .section-lead  { color: rgba(255,255,255,.72); }

/* ==============================
   5. Buttons
   ============================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: .7em 1.7em;
  border-radius: var(--r-md);
  font-size: .95rem;
  font-weight: 600;
  letter-spacing: .03em;
  border: 2px solid transparent;
  cursor: pointer;
  transition: background var(--ease), color var(--ease),
              border-color var(--ease), transform var(--ease), box-shadow var(--ease);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--green);
  color: var(--white);
  border-color: var(--green);
}
.btn-primary:hover {
  background: var(--green-mid);
  border-color: var(--green-mid);
}

.btn-ghost {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,.55);
}
.btn-ghost:hover {
  background: rgba(255,255,255,.1);
  border-color: var(--white);
}

.btn-lg  { padding: .85em 2.2em; font-size: 1.02rem; }
.btn-block { width: 100%; }

/* ==============================
   6. Placeholder Image Boxes
   ============================== */
.placeholder-img-box {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: var(--gray-100);
  border: 2px dashed var(--gray-300);
  border-radius: var(--r-lg);
  padding: 32px 24px;
  min-height: 220px;
  color: var(--gray-400);
  text-align: center;
  font-size: .85rem;
  line-height: 1.65;
}
.placeholder-img-box.sm    { min-height: 200px; }
.placeholder-img-box.graph { min-height: 260px; }
.placeholder-img-box.logo-area { min-height: 300px; }
.placeholder-icon { font-size: 2.8rem; color: var(--gray-300); }

/* ==============================
   7. Footnotes / Notes / Disclaimers
   ============================== */
.section-footnote {
  font-size: .78rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: 10px;
}

/* Inline note block */
.note-block {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  background: var(--gray-100);
  border-left: 4px solid var(--gray-300);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  padding: 14px 18px;
  font-size: .83rem;
  color: var(--text-light);
  line-height: 1.75;
}
.note-block i { color: var(--navy-light); flex-shrink: 0; margin-top: 2px; }

/* ==============================
   7b. SITE TOP BANNER
   ============================== */
.site-top-banner {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 1001;
  height: var(--banner-h);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--navy-deep);
  color: rgba(255, 255, 255, .92);
  font-size: .8125rem;
  font-weight: 500;
  letter-spacing: .12em;
  text-align: center;
  padding-inline: 16px;
  border-bottom: 1px solid rgba(255, 255, 255, .08);
}

/* ==============================
   8. HEADER
   ============================== */
/* ==============================
   ヘッダー — ミニマル・上品リデザイン
   ============================== */
.site-header {
  position: fixed;
  inset-block-start: var(--banner-h);
  inset-inline: 0;
  z-index: 1000;
  height: var(--header-h);
  /* ロゴ画像の背景色 #1a1e23 に完全一致させてシームレスに表示 */
  background: #1a1e23;
  border-bottom: 1px solid rgba(255,255,255,.07);
  transition: background var(--ease), box-shadow var(--ease);
}

/* ヘッダーロゴ */
.header-logo {
  flex: 0 0 auto;
  min-width: 0;
}
.header-logo-link {
  display: block;
  line-height: 0;
  text-decoration: none;
  transition: opacity var(--ease);
}
.header-logo-link:hover { opacity: .85; }

.header-logo-img {
  display: block;
  height: 40px;
  width: auto;
  max-width: min(360px, calc(100vw - 140px));
  object-fit: contain;
  object-position: left center;
}
.header-logo-link:hover .header-logo-img {
  opacity: .88;
}

/* 旧ロゴ関連クラス（非表示） */
.header-logo-block,
.header-company-name,
.header-logo-img-raw,
.header-logo-svg-fb,
.header-logo-svg,
.header-logo-img-blend,
.header-logo-ja { display: none; }
.site-header.scrolled {
  background: #1a1e23;
  box-shadow: 0 1px 0 rgba(255,255,255,.05), 0 4px 24px rgba(0,0,0,.35);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 8px;
  /* ロゴ | flex-1スペーサー | ナビ | CTA の構造 */
}

/* 旧テキストロゴ用クラス（後方互換・非表示） */
.logo-mark, .logo-text, .logo-main, .logo-sub { display: none; }

/* Nav — 余白を広げ、上品なフォントウェイトに */
.site-nav ul {
  display: flex;
  align-items: center;
  gap: 0;
}
.site-nav ul li a {
  display: block;
  padding: 6px 13px;
  color: rgba(255,255,255,.68);
  font-size: .80rem;
  font-weight: 400;
  letter-spacing: .04em;
  border-radius: 4px;
  transition: color var(--ease);
  white-space: nowrap;
  /* ホバー時に下線スタイルのみ（背景色なし = よりミニマル） */
  position: relative;
}
.site-nav ul li a::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 13px;
  right: 13px;
  height: 1px;
  background: var(--green-light);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .28s ease;
}
.site-nav ul li a:hover {
  color: rgba(255,255,255,.95);
}
.site-nav ul li a:hover::after {
  transform: scaleX(1);
}
/* お問い合わせ: アウトラインボタン → グリーン実線ボタン */
.btn-nav-contact {
  background: transparent !important;
  color: rgba(255,255,255,.90) !important;
  padding: 7px 18px !important;
  border-radius: 4px !important;
  border: 1px solid rgba(45,179,96,.55) !important;
  font-size: .80rem !important;
  font-weight: 500 !important;
  letter-spacing: .05em !important;
  margin-left: 8px;
  transition: background var(--ease), border-color var(--ease), color var(--ease) !important;
}
.btn-nav-contact::after { display: none !important; }
.btn-nav-contact:hover {
  background: var(--green) !important;
  border-color: var(--green) !important;
  color: var(--white) !important;
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 4px;
  border-radius: var(--r-sm);
  flex-shrink: 0;
  transition: background var(--ease);
}
.nav-toggle:hover { background: rgba(255,255,255,.1); }
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: transform var(--ease), opacity var(--ease);
  margin: 0 auto;
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ==============================
   9. HERO
   ============================== */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: calc(var(--banner-h) + var(--header-h));
  background: var(--navy-deep);
}

/* ==============================================================
   Hero Background — Ken Burns Cinematic Animation
   映画的なKen Burns効果: ゆっくりとした前進＋奥行き感のある横移動
   ループ: 18秒 alternate（行き/戻り = 実質36秒の緩やかな動き）
   ============================================================== */
.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
  /* 画像ロード前の背景色 */
  background: #071828;
}

/* ベース背景レイヤー（拡大余白込み） */
.hero-bg-img {
  position: absolute;
  /* Ken Burns用の余白: 拡大してもエッジが見えないよう */
  inset: -10%;
  width: 120%;
  height: 120%;
  background-position: center 40%;  /* 電池群の中心をやや上に */
  background-repeat: no-repeat;
  background-size: cover;
  /* GPU アクセラレーション */
  will-change: transform, filter;
  transform-origin: center center;
}

/* -----------------------------------------------
   産業用鉛蓄電池施設 — 高品質メインビジュアル
   現在: SVGインライン描画（外部URLなし・コンソールエラーゼロ）
   本番: images/hero-bg.jpg を配置 → JS が自動で上書き設定
   Ken Burns アニメーションは .hero-bg-img--main 要素全体（SVGごと）に適用
----------------------------------------------- */
/* 産業用鉛蓄電池施設 — 高品質メインビジュアル（nano-banana-pro生成・98点）
   ローカル画像: images/hero-bg.jpg（PNG, 5.9MB, 整然とした電池列・ネイビー/グレー/ホワイト）
   Fallback: CSS グラデーション（画像読み込み失敗時） */
.hero-bg-img--main {
  background-image: url('images/hero-bg.jpg');
  background-position: center 40%;
  animation: heroPan 18s cubic-bezier(0.37, 0, 0.63, 1) infinite alternate;
}

/* HTML内のSVGフォールバック要素は非表示（画像で上書き） */
.hero-svg-facility {
  display: none !important;
}

/* -----------------------------------------------
   Ken Burns: 3段階の映画的カメラワーク
   0%   → ゆるやかなズームイン開始（電池群の正面から奥へ視線）
   50%  → 中間点: わずかに右へパン（電池列の広がりを見せる）
   100% → ズームイン完了＋左下へ（手前の電池端子に近づく感覚）
   brightness: 微細な明暗変化で電池が「浮かび上がる」演出
----------------------------------------------- */
@keyframes heroPan {
  0% {
    transform: scale(1.00) translate(0%,   0%);
    filter: brightness(.90) contrast(1.02);
  }
  30% {
    transform: scale(1.04) translate(1%,  -0.5%);
    filter: brightness(.84) contrast(1.04);
  }
  65% {
    transform: scale(1.08) translate(-0.5%, -0.8%);
    filter: brightness(.80) contrast(1.05);
  }
  100% {
    transform: scale(1.13) translate(-2%,  -1.5%);
    filter: brightness(.76) contrast(1.06);
  }
}

/* -----------------------------------------------
   ビネット効果: 中央が明るく、周辺・上下が暗く
   電池群が「浮き出て見える」立体感を演出
----------------------------------------------- */
.hero-bg-vignette {
  position: absolute;
  inset: 0;
  background:
    /* 中央楕円形ハイライト: 電池群の列方向に沿って */
    radial-gradient(
      ellipse 70% 55% at 62% 50%,
      transparent 35%,
      rgba(7,24,40,.50) 75%,
      rgba(7,24,40,.78) 100%
    ),
    /* 上辺: ヘッダーとのなじみ */
    linear-gradient(
      to bottom,
      rgba(7,24,40,.45) 0%,
      transparent 20%,
      transparent 65%,
      rgba(7,24,40,.55) 100%
    );
  z-index: 1;
}

/* -----------------------------------------------
   テキストオーバーレイ
   左〜中央左: テキストエリアを確実に暗く（可読性確保）
   右側: 電池施設ビジュアルを見せる（50%〜以降は薄く）
----------------------------------------------- */
.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    /* 横方向: 左端100%→中央60%→右端10% */
    linear-gradient(
      108deg,
      rgba(5,18,32,.95)  0%,
      rgba(7,24,40,.85) 28%,
      rgba(7,24,40,.60) 50%,
      rgba(7,24,40,.22) 72%,
      rgba(7,24,40,.05) 100%
    ),
    /* 縦方向: トップ/ボトム強調 */
    linear-gradient(
      to bottom,
      rgba(7,24,40,.60) 0%,
      transparent       22%,
      transparent       68%,
      rgba(7,24,40,.55) 100%
    );
  z-index: 2;
}

.hero-content {
  position: relative;
  z-index: 3;
  color: var(--white);
  padding-block: clamp(72px, 12vw, 150px);
  max-width: 680px;  /* かずっくないようやや紞め */
}

/* Heroアイコンバッジ — アップログテキストの替りに小さなバッジ */
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: .70rem;
  font-weight: 500;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: rgba(45,179,96,.85);
  margin-bottom: 28px;
  /* ボーダーなしでミニマルに */
}
.hero-eyebrow i {
  font-size: .65rem;
  opacity: .7;
}

/* Heroタイトル — AIMING FOR ZERO WASTE 構成 */
.hero-title {
  font-family: var(--font-sans, 'Noto Sans JP', sans-serif);
  font-size: clamp(2.6rem, 6.5vw, 5.2rem);
  font-weight: 700;
  line-height: 1.10;
  margin-bottom: 28px;
  letter-spacing: .01em;
  animation: heroTextIn 1.0s cubic-bezier(0.22, 1, 0.36, 1) both;
  animation-delay: 0.15s;
}

/* 英語メインコピー: AIMING FOR ZERO WASTE */
.hero-title-main {
  display: block;
  font-family: 'Helvetica Neue', 'Arial', sans-serif;
  font-size: clamp(2.6rem, 6.5vw, 5.2rem);
  font-weight: 800;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--white);
  line-height: 1.10;
  /* テキストに力強さとエレガンスを付与 */
  text-shadow: 0 2px 24px rgba(0,0,0,.45);
  margin-bottom: .30em;
}

/* 日本語サブコピー: 鉛電池延命 × コスト削減 × 環境負荷削減 */
.hero-title-sub {
  display: inline-block;
  font-style: normal;
  font-family: var(--font-sans, 'Noto Sans JP', sans-serif);
  font-size: clamp(.95rem, 2.0vw, 1.35rem);
  font-weight: 500;
  letter-spacing: .14em;
  color: rgba(255,255,255,.90);
  padding-bottom: .20em;
  border-bottom: 2px solid rgba(45,179,96,.55);
  margin-top: .18em;
  text-shadow: 0 1px 8px rgba(0,0,0,.40);
  /* 3要素が長くなるので折り返し時も自然に */
  white-space: nowrap;
}

/* × 記号はグリーンアクセント */
.hero-title-x {
  color: var(--green-light, #2db360);
  font-weight: 700;
  margin: 0 .30em;
  opacity: .90;
}

/* SP: 改行制御 */
.br-always { display: block; }

/* SP: 3要素が収まるようサイズ・letter-spacingを下げる */
@media (max-width: 600px) {
  .hero-title-main {
    font-size: clamp(2.1rem, 10vw, 2.8rem);
    letter-spacing: .04em;
  }
  .hero-title-sub {
    font-size: clamp(.78rem, 4.0vw, 1.0rem);
    letter-spacing: .06em;
    white-space: normal;   /* 極小画面では折り返しを許可 */
  }
  .hero-title-x {
    margin: 0 .20em;
  }
}

/* =====================================================
   Hero 説明文ブロック — 2段構成
   上段: 「資源をめぐらせ、未来を変える。」（大・印象的）
   下段: サーキュラーエコノミー〜（補足文）
===================================================== */
.hero-desc-block {
  margin-bottom: 40px;
  animation: heroTextIn 1.0s cubic-bezier(0.22, 1, 0.36, 1) both;
  animation-delay: 0.28s;
}

/* 上段: キャッチフレーズ */
.hero-desc-catch {
  font-family: var(--font-serif, 'Noto Serif JP', serif);
  font-size: clamp(1.25rem, 2.8vw, 1.75rem);
  font-weight: 600;
  color: rgba(255,255,255,.96);
  letter-spacing: .08em;
  line-height: 1.5;
  margin-bottom: .65em;
  /* 左にグリーンのアクセントライン */
  padding-left: 1em;
  border-left: 3px solid rgba(45,179,96,.75);
  text-shadow: 0 2px 16px rgba(0,0,0,.50);
}

/* 下段: 補足説明文 */
.hero-desc-body {
  font-size: clamp(.84rem, 1.55vw, .97rem);
  color: rgba(255,255,255,.58);
  line-height: 2.05;
  font-weight: 300;
  letter-spacing: .03em;
  padding-left: 1em; /* キャッチと揃える */
  text-shadow: 0 1px 6px rgba(0,0,0,.30);
}

/* 旧 .hero-desc（後方互換） */
.hero-desc {
  font-size: clamp(.88rem, 1.6vw, 1.0rem);
  color: rgba(255,255,255,.60);
  line-height: 1.95;
  margin-bottom: 40px;
  font-weight: 300;
  letter-spacing: .02em;
  animation: heroTextIn 1.0s cubic-bezier(0.22, 1, 0.36, 1) both;
  animation-delay: 0.28s;
}

/* SP: 文字サイズと余白を調整 */
@media (max-width: 640px) {
  .hero-desc-catch {
    font-size: clamp(1.1rem, 5.5vw, 1.35rem);
    letter-spacing: .05em;
    padding-left: .75em;
  }
  .hero-desc-body {
    font-size: clamp(.82rem, 3.8vw, .92rem);
    line-height: 1.90;
    padding-left: .75em;
  }
}

@keyframes heroTextIn {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .hero-title, .hero-desc { animation: none; }
}
.br-pc { display: none; }

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 52px;
  animation: heroTextIn 1.0s cubic-bezier(0.22, 1, 0.36, 1) both;
  animation-delay: 0.40s;
}

/* Hero CTA ボタンリファイン */
.hero-cta-group .btn-primary {
  background: var(--green);
  border-color: var(--green);
  font-weight: 500;
  letter-spacing: .04em;
  box-shadow: 0 4px 20px rgba(26,122,66,.35);
}
.hero-cta-group .btn-ghost {
  border-color: rgba(255,255,255,.30);
  font-weight: 400;
  letter-spacing: .04em;
}
.hero-cta-group .btn-ghost:hover {
  border-color: rgba(255,255,255,.65);
  background: rgba(255,255,255,.07);
}

/* Hero stats — ボーダレス・グラスモーフィズム */
.hero-stats {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  padding: 16px 0;
  /* ボーダーを細線のみにしてグラスパネルを減らす */
  border-top: 1px solid rgba(255,255,255,.10);
  gap: 0;
  width: fit-content;
  animation: heroTextIn 1.0s cubic-bezier(0.22, 1, 0.36, 1) both;
  animation-delay: 0.50s;
}
.hero-stat {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 4px 22px 4px 0;
  margin-right: 22px;
  font-size: .78rem;
  color: rgba(255,255,255,.55);
  font-weight: 400;
  letter-spacing: .04em;
}
.hero-stat:first-child { padding-left: 0; }
.hero-stat-icon {
  color: var(--green-light);
  font-size: .9rem;
  opacity: .8;
}
.hero-stat-divider {
  width: 1px;
  height: 18px;
  background: rgba(255,255,255,.12);
  margin-right: 22px;
}

/* Hero scroll indicator */
.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: rgba(255,255,255,.45);
  transition: color var(--ease);
}
.hero-scroll:hover { color: var(--green-light); }
.hero-scroll-text {
  font-size: .6rem;
  letter-spacing: .2em;
  font-weight: 600;
}
.hero-scroll-icon {
  font-size: .95rem;
  animation: bounce 2.2s ease-in-out infinite;
}
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(7px); }
}

/* ==============================
   10. SECTION: 課題
   ============================== */
.issue-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  margin-bottom: 40px;
}

.issue-card {
  background: var(--white);
  border-radius: var(--r-xl);
  padding: 34px 26px;
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-xs);
  transition: box-shadow var(--ease), transform var(--ease), border-color var(--ease);
}
.issue-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
  border-color: var(--gray-300);
}

.issue-card-icon {
  width: 52px;
  height: 52px;
  background: var(--green-pale);
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--green);
  font-size: 1.25rem;
  margin-bottom: 18px;
}
.issue-card-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 10px;
  line-height: 1.45;
}
.issue-card-text {
  font-size: .875rem;
  color: var(--text-light);
  line-height: 1.9;
}

/* 課題の数字 */
.issue-data-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  background: var(--white);
  border-radius: var(--r-xl);
  padding: 28px 32px;
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-xs);
}
.issue-data-item { text-align: center; }
.issue-data-num {
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  color: var(--navy);
  font-weight: 600;
  margin-bottom: 6px;
}
.issue-data-num strong { font-size: 1.15em; color: var(--green); }
.issue-data-label {
  font-size: .78rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ======================================================
   SECTION 1 (compact) — 鉛電池の重要性
   li-* プレフィックス
   ====================================================== */

/* ① インパクト数字行 */
.li-impact-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2px;
  background: var(--gray-200);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  margin-bottom: 32px;
}
.li-impact-item {
  background: var(--white);
  padding: 28px 20px 24px;
  text-align: center;
  transition: background var(--ease);
}
.li-impact-item:hover { background: var(--gray-50); }
.li-impact-num {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 3.5vw, 2.8rem);
  font-weight: 700;
  color: var(--navy);
  line-height: 1;
  margin: 0 0 10px;
}
.li-impact-unit {
  font-size: .48em;
  font-weight: 600;
  color: var(--navy-mid);
  letter-spacing: .04em;
}
.li-impact-label {
  font-size: .78rem;
  color: var(--text-light);
  line-height: 1.65;
  margin: 0;
}
.li-impact-note {
  display: block;
  font-size: .72rem;
  color: var(--text-muted);
  margin-top: 3px;
  font-style: italic;
}

/* ② メイングリッド：強み3カード | 用途バンド */
.li-main-grid {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 22px;
  margin-bottom: 28px;
  align-items: stretch;
}

/* 強みカード列 */
.li-strength-col {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.li-strength-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-lg);
  padding: 20px 22px;
  box-shadow: var(--shadow-xs);
  transition: box-shadow var(--ease), transform var(--ease);
}
.li-strength-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.li-strength-card--accent {
  border-left: 3px solid var(--green);
}
.li-strength-icon {
  width: 42px;
  height: 42px;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--r-md);
  background: rgba(12,35,64,.07);
  color: var(--navy);
  font-size: 1.1rem;
}
.li-strength-icon--green {
  background: var(--green-pale);
  color: var(--green);
}
.li-strength-title {
  font-size: .98rem;
  font-weight: 700;
  color: var(--navy);
  margin: 0 0 6px;
  line-height: 1.4;
}
.li-strength-text {
  font-size: .845rem;
  color: var(--text-light);
  line-height: 1.85;
  margin: 0;
}

/* 用途バンド */
.li-use-band {
  background: linear-gradient(160deg, var(--navy-deep) 0%, var(--navy) 60%, var(--navy-mid) 100%);
  border-radius: var(--r-xl);
  padding: 28px 26px;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}
.li-use-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 90% 10%, rgba(255,255,255,.08), transparent 30%);
  pointer-events: none;
}
.li-use-band-eyebrow {
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .1em;
  color: rgba(255,255,255,.55);
  margin: 0 0 10px;
}
.li-use-band-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--white);
  line-height: 1.4;
  margin: 0 0 20px;
}
.li-use-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.li-use-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: .87rem;
  color: rgba(255,255,255,.88);
  line-height: 1.5;
}
.li-use-list li i {
  width: 18px;
  text-align: center;
  color: var(--green-light);
  flex-shrink: 0;
  font-size: .9rem;
}

/* ③ ハイライト締め */
.li-highlight {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  background: linear-gradient(135deg, var(--navy-deep), var(--navy));
  border-radius: var(--r-xl);
  padding: 28px 32px;
  box-shadow: var(--shadow-md);
}
.li-highlight-icon {
  font-size: 1.6rem;
  color: var(--green-light);
  flex-shrink: 0;
  margin-top: 3px;
  opacity: .85;
}
.li-highlight-text {
  font-size: .97rem;
  color: rgba(255,255,255,.90);
  line-height: 1.9;
  margin: 0;
}
.li-highlight-text strong {
  color: var(--white);
  font-weight: 700;
}

/* ─── ビジュアルバナー ─── */
.li-visual-banner {
  margin: 0 0 36px;
  padding: 0;
  border: 0;
}
.li-visual-banner-frame {
  border-radius: var(--r-xl);
  overflow: hidden;
  box-shadow:
    0 2px 8px rgba(12,35,64,.10),
    0 8px 32px rgba(12,35,64,.10);
  line-height: 0;            /* inline-block の余白を消す */
  background: var(--navy-deep);
}
.li-visual-banner-img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 21 / 9;
  object-fit: cover;
  object-position: center center;
  /* 既存ページのネイビー/ブルーグレー基調に自然に馴染むよう
     彩度をわずかに落とし、明るさを微調整 */
  filter: saturate(.92) brightness(.97) contrast(1.02);
  transition: filter .4s ease;
}
.li-visual-banner-frame:hover .li-visual-banner-img {
  filter: saturate(1) brightness(1) contrast(1.02);
}
.li-visual-banner-caption {
  display: flex;
  align-items: center;
  gap: 7px;
  margin-top: 10px;
  padding: 0 4px;
  font-size: .78rem;
  color: var(--text-muted);
  line-height: 1.6;
  font-style: italic;
}
.li-visual-banner-caption i {
  font-size: .78rem;
  color: var(--gray-400);
  flex-shrink: 0;
  font-style: normal;
}

/* レスポンシブ */
@media (max-width: 900px) {
  .li-main-grid { grid-template-columns: 1fr; }
  .li-use-band { padding: 24px 22px; }
}
@media (max-width: 640px) {
  .li-impact-row { grid-template-columns: repeat(2, 1fr); }
  .li-highlight { flex-direction: column; gap: 10px; padding: 22px 20px; }
  .li-strength-card { padding: 16px 18px; }
  .li-visual-banner-frame { border-radius: var(--r-lg); }
}

/* ======================================================
   SECTION 1 — 市場規模・成長性
   lm-* プレフィックス
   ====================================================== */

/* ─── セクション全体 ─── */
.lm-section {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-xl);
  padding: clamp(32px, 5vw, 52px) clamp(24px, 4vw, 48px);
  margin-bottom: 32px;
  box-shadow: 0 2px 16px rgba(12,35,64,.06);
}

/* ─── ヘッダー ─── */
.lm-header {
  text-align: center;
  margin-bottom: 32px;
}
.lm-eyebrow {
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .16em;
  color: var(--navy-light);
  margin: 0 0 12px;
}
.lm-title {
  font-family: var(--font-serif);
  font-size: clamp(1.15rem, 2.5vw, 1.7rem);
  font-weight: 700;
  color: var(--navy);
  line-height: 1.45;
  margin: 0 0 12px;
  letter-spacing: -.01em;
}
.lm-subtitle {
  font-size: .97rem;
  color: var(--text-light);
  line-height: 1.7;
  margin: 0;
}

/* ─── リード文 ─── */
.lm-lead-block {
  max-width: 820px;
  margin: 0 auto 36px;
  padding: 24px 28px;
  background: var(--gray-50);
  border-left: 4px solid var(--navy-mid);
  border-radius: 0 var(--r-lg) var(--r-lg) 0;
}
.lm-lead-block p {
  font-size: .95rem;
  color: var(--text-mid);
  line-height: 2;
  margin: 0 0 14px;
}
.lm-lead-block p:last-child { margin-bottom: 0; }
.lm-lead-block strong { color: var(--navy); font-weight: 700; }

/* ─── KPI 数字カード ─── */
.lm-kpi-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}
.lm-kpi-card {
  flex: 1;
  min-width: 160px;
  max-width: 220px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-top: 3px solid var(--navy-mid);
  border-radius: var(--r-lg);
  padding: 22px 16px 20px;
  text-align: center;
  box-shadow: 0 1px 6px rgba(12,35,64,.07);
  transition: transform .2s ease, box-shadow .2s ease;
}
.lm-kpi-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(12,35,64,.12);
}
.lm-kpi-card--accent {
  border-top-color: var(--navy);
  background: var(--gray-50);
}
.lm-kpi-card--highlight {
  border-top-color: var(--green);
  background: #f5faf7;
  border-color: #b8d8c4;
}
.lm-kpi-year {
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--text-muted);
  margin: 0 0 8px;
}
.lm-kpi-num {
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  font-weight: 400;
  color: var(--navy-mid);
  line-height: 1.15;
  margin: 0 0 8px;
}
.lm-kpi-num strong {
  font-size: 1.35em;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -.02em;
}
.lm-kpi-card--highlight .lm-kpi-num strong { color: var(--green); }
.lm-kpi-unit {
  font-size: .55em;
  font-weight: 600;
  color: var(--navy-mid);
  letter-spacing: .04em;
  vertical-align: baseline;
  margin-left: 2px;
}
.lm-kpi-label {
  font-size: .75rem;
  color: var(--text-light);
  line-height: 1.55;
  margin: 0;
}
.lm-kpi-note {
  display: block;
  font-size: .7rem;
  color: var(--text-muted);
  margin-top: 3px;
  font-style: italic;
}
/* 矢印 */
.lm-kpi-arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  color: var(--navy-mid);
  flex-shrink: 0;
  opacity: .55;
}
.lm-kpi-arrow i { font-size: 1.6rem; }
.lm-kpi-arrow-label {
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .06em;
}

/* ─── 比較表 ─── */
.lm-table-wrap {
  margin-bottom: 32px;
}
.lm-table-eyebrow {
  font-size: .7rem;
  font-weight: 800;
  letter-spacing: .14em;
  color: var(--navy-light);
  margin: 0 0 6px;
}
.lm-table-heading {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--navy);
  margin: 0 0 14px;
}
.lm-table-scroll { overflow-x: auto; }
.lm-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .9rem;
}
.lm-table thead tr {
  background: var(--navy);
}
.lm-table thead th {
  padding: 12px 18px;
  color: rgba(255,255,255,.9);
  font-weight: 600;
  font-size: .82rem;
  letter-spacing: .04em;
  text-align: center;
  white-space: nowrap;
}
.lm-table thead th:first-child { text-align: left; }
.lm-table tbody tr {
  border-bottom: 1px solid var(--gray-100);
}
.lm-table tbody tr:last-child { border-bottom: none; }
.lm-table tbody td {
  padding: 13px 18px;
  color: var(--text-mid);
  text-align: center;
  line-height: 1.6;
}
.lm-table tbody td:first-child {
  text-align: left;
  color: var(--text);
  font-weight: 500;
}
.lm-tr-highlight {
  background: rgba(12,35,64,.04);
}
.lm-tr-highlight td { color: var(--navy) !important; }
.lm-td-rate {
  font-weight: 600;
  color: var(--text-mid);
}
.lm-td-rate--lead {
  color: var(--green) !important;
}
.lm-td-na { color: var(--text-muted); }
/* 表の補足 */
.lm-table-note {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-top: 14px;
  padding: 16px 20px;
  background: rgba(12,35,64,.04);
  border-left: 3px solid var(--navy-mid);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  font-size: .83rem;
  color: var(--text-light);
  line-height: 1.85;
}
.lm-table-note i {
  color: var(--navy-light);
  flex-shrink: 0;
  margin-top: 2px;
}
.lm-table-note p { margin: 0; }
.lm-table-note strong { color: var(--navy); font-weight: 700; }

/* ─── 本文テキスト ─── */
.lm-body-text {
  max-width: 820px;
  margin: 0 auto 32px;
}
.lm-body-text p {
  font-size: .95rem;
  color: var(--text-mid);
  line-height: 2;
  margin: 0 0 18px;
}
.lm-body-text p:last-child { margin-bottom: 0; }
.lm-body-text strong { color: var(--navy); font-weight: 700; }

/* ─── 強調メッセージ ─── */
.lm-conclusion {
  display: flex;
  align-items: center;
  gap: 20px;
  background: linear-gradient(135deg, var(--navy-deep) 0%, var(--navy) 60%, var(--navy-mid) 100%);
  border-radius: var(--r-lg);
  padding: 24px 32px;
  box-shadow: 0 4px 20px rgba(12,35,64,.18);
}
.lm-conclusion-icon {
  font-size: 1.8rem;
  color: var(--green-light);
  flex-shrink: 0;
  opacity: .85;
}
.lm-conclusion-text {
  font-size: clamp(.92rem, 1.6vw, 1.05rem);
  color: rgba(255,255,255,.9);
  line-height: 1.85;
  margin: 0;
}
.lm-conclusion-text strong {
  color: #7dd3b0;
  font-weight: 700;
}

/* ─── レスポンシブ ─── */
@media (max-width: 860px) {
  .lm-kpi-row { gap: 8px; }
  .lm-kpi-card { min-width: 130px; }
  .lm-kpi-arrow { display: none; }
}
@media (max-width: 640px) {
  .lm-section { padding: 24px 18px; }
  .lm-kpi-row { flex-direction: column; align-items: stretch; }
  .lm-kpi-card { max-width: 100%; min-width: unset; }
  .lm-kpi-arrow { display: none; }
  .lm-lead-block { padding: 18px 16px; }
  .lm-conclusion { flex-direction: column; gap: 12px; padding: 20px 18px; }
}

/* ======================================================
   SECTION 1 (new) — エネルギーインフラ
   ei-* プレフィックス
   ====================================================== */

/* ① 指標行 */
.ei-stats-row {
  display: flex;
  align-items: stretch;
  gap: 0;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-sm);
  padding: 32px 28px;
  margin-bottom: 52px;
  flex-wrap: wrap;
}
.ei-stat-item {
  flex: 1;
  min-width: 160px;
  text-align: center;
  padding: 0 20px;
}
.ei-stat-num {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--navy);
  line-height: 1.1;
  margin-bottom: 10px;
}
.ei-stat-num--sm {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
}
.ei-stat-unit {
  font-size: .52em;
  font-weight: 500;
  color: var(--navy-mid);
  letter-spacing: .04em;
}
.ei-stat-label {
  font-size: .8rem;
  color: var(--text-light);
  line-height: 1.7;
}
.ei-stat-divider {
  width: 1px;
  background: var(--gray-200);
  margin: 8px 0;
  align-self: stretch;
  flex-shrink: 0;
}

/* ② サブタイトルブロック */
.ei-section-label {
  margin-bottom: 28px;
}
.ei-sub-title {
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 2.4vw, 1.9rem);
  font-weight: 600;
  color: var(--navy);
  margin: 12px 0 10px;
  line-height: 1.4;
  letter-spacing: -.01em;
}
.ei-sub-lead {
  font-size: .94rem;
  color: var(--text-light);
  line-height: 1.9;
  max-width: 780px;
}

/* ③ ダークバンド（活用領域） */
.ei-band {
  background: linear-gradient(135deg, var(--navy-deep) 0%, var(--navy) 55%, var(--navy-mid) 100%);
  border-radius: var(--r-xl);
  padding: clamp(32px, 5vw, 52px) clamp(28px, 5vw, 52px);
  margin: 48px 0 0;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.ei-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 15% 20%, rgba(255,255,255,.07), transparent 30%),
    radial-gradient(circle at 85% 80%, rgba(26,122,66,.12), transparent 28%);
  pointer-events: none;
}
.ei-band-head {
  position: relative;
  z-index: 1;
  margin-bottom: 28px;
  max-width: 860px;
}
.ei-band-eyebrow {
  background: rgba(255,255,255,.14);
  color: rgba(255,255,255,.9);
}
.ei-band-title {
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 2.4vw, 1.9rem);
  font-weight: 600;
  color: var(--white);
  margin: 14px 0 12px;
  line-height: 1.4;
}
.ei-band-lead {
  font-size: .94rem;
  color: rgba(255,255,255,.80);
  line-height: 1.9;
  margin: 0;
}
.ei-band-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.ei-band-card {
  background: rgba(255,255,255,.09);
  border: 1px solid rgba(255,255,255,.14);
  border-radius: var(--r-lg);
  padding: 26px 28px;
  backdrop-filter: blur(8px);
  transition: background var(--ease);
}
.ei-band-card:hover {
  background: rgba(255,255,255,.14);
}
.ei-band-card-icon {
  font-size: 1.4rem;
  color: var(--green-light);
  margin-bottom: 12px;
  display: block;
}
.ei-band-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 10px;
}
.ei-band-card-text {
  font-size: .88rem;
  color: rgba(255,255,255,.82);
  line-height: 1.9;
  margin: 0;
}

/* ④ リサイクル 2カードグリッド */
.ei-recycle-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
  margin-bottom: 32px;
}

/* ⑤ プロセスフロー */
.ei-process {
  display: flex;
  align-items: stretch;
  gap: 0;
  margin-bottom: 48px;
  flex-wrap: wrap;
}
.ei-step {
  flex: 1;
  min-width: 140px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-lg);
  padding: 22px 18px;
  box-shadow: var(--shadow-xs);
  transition: box-shadow var(--ease), transform var(--ease);
}
.ei-step:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}
.ei-step-num {
  display: inline-flex;
  width: 32px;
  height: 32px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--green-pale);
  color: var(--green);
  font-weight: 800;
  font-size: .9rem;
  margin-bottom: 12px;
}
.ei-step-title {
  font-size: .98rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 8px;
}
.ei-step-text {
  font-size: .84rem;
  color: var(--text-light);
  line-height: 1.8;
  margin: 0;
}
.ei-step-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 10px;
  color: var(--gray-300);
  font-size: .9rem;
  flex-shrink: 0;
  align-self: center;
}

/* ⑥ FUTUREハイライト */
.ei-highlight {
  background: linear-gradient(160deg, var(--white), var(--off-white));
  border: 1px solid rgba(31,111,178,.13);
  border-left: 4px solid var(--navy-mid);
  border-radius: var(--r-xl);
  padding: clamp(26px, 4vw, 40px) clamp(24px, 4vw, 40px);
  box-shadow: var(--shadow-sm);
}
.ei-highlight-title {
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 14px;
  line-height: 1.45;
}
.ei-highlight-text {
  font-size: .97rem;
  color: var(--text-mid);
  line-height: 2;
  margin: 0;
}
.ei-highlight-text strong {
  color: var(--navy);
  font-weight: 700;
}

/* レスポンシブ */
@media (max-width: 900px) {
  .ei-band-grid,
  .ei-recycle-grid {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 640px) {
  .ei-stats-row {
    flex-direction: column;
    gap: 20px;
    padding: 22px 18px;
  }
  .ei-stat-divider {
    width: 100%;
    height: 1px;
    margin: 0;
  }
  .ei-process {
    flex-direction: column;
    gap: 12px;
  }
  .ei-step-arrow {
    transform: rotate(90deg);
    padding: 4px 0;
  }
}

/* ==============================
   11. SECTION: 提案
   ============================== */
/* Flow */
/* ================================================
   SECTION 2 — 鉛電池劣化の主たる原因
   サルフェーション図解・補足説明・CTA
   ================================================ */

/* =====================================================
   劣化鉛電池 シネマティックビジュアル  .db-*
   ===================================================== */

/* 外枠：余白とキャプション込みのfigure */
.db-visual {
  margin: 8px 0 56px;
  padding: 0;
}

/* 写真フレーム本体 */
.db-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 6;
  overflow: hidden;
  border-radius: 12px;
  /* 上品な多重シャドウ */
  box-shadow:
    0 2px 4px  rgba(0,0,0,.08),
    0 8px 24px rgba(0,0,0,.14),
    0 24px 64px rgba(10,20,40,.18);
  /* 細い枠線で引き締め */
  outline: 1px solid rgba(255,255,255,.06);
}

/* 写真 */
.db-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 38%;
  display: block;
  /* 白・紺・グレー基調に合わせ、やや脱彩色 */
  filter: brightness(.84) contrast(1.06) saturate(.78);
  transition: transform 1s cubic-bezier(.25,.46,.45,.94),
              filter     1s cubic-bezier(.25,.46,.45,.94);
}
.db-frame:hover .db-photo {
  transform: scale(1.04);
  filter: brightness(.78) contrast(1.09) saturate(.82);
}

/* 上部グラデーション（空などの明るさを抑える） */
.db-grad-top {
  position: absolute;
  inset: 0 0 auto 0;
  height: 40%;
  background: linear-gradient(
    to bottom,
    rgba(8,16,34,.32) 0%,
    transparent 100%
  );
  pointer-events: none;
}

/* 下部グラデーション（テキスト背景） */
.db-grad-bottom {
  position: absolute;
  inset: auto 0 0 0;
  height: 62%;
  background: linear-gradient(
    to top,
    rgba(6,14,30,.82) 0%,
    rgba(6,14,30,.48) 45%,
    transparent 100%
  );
  pointer-events: none;
}

/* 左ボーダーアクセント（ネイビー系ゴールドライン） */
.db-accent-line {
  position: absolute;
  top: 18%;
  bottom: 18%;
  left: 0;
  width: 3px;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    rgba(180,150,60,.9) 30%,
    rgba(200,168,72,.9) 70%,
    transparent 100%
  );
  border-radius: 0 2px 2px 0;
}

/* テキストブロック（左下） */
.db-caption-block {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 28px 40px 30px 44px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

/* FIELD DOCUMENTATION */
.db-eyebrow {
  margin: 0;
  font-family: 'Noto Sans JP', sans-serif;
  font-size: .66rem;
  font-weight: 500;
  letter-spacing: .28em;
  color: rgba(200,175,90,.85);
  text-transform: uppercase;
}

/* 使用済み鉛電池の一例 */
.db-heading {
  margin: 0;
  font-family: 'Noto Serif JP', serif;
  font-size: 1.45rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: .05em;
  line-height: 1.25;
  text-shadow: 0 1px 8px rgba(0,0,0,.6);
}

/* サブテキスト */
.db-sub {
  margin: 0;
  font-family: 'Noto Sans JP', sans-serif;
  font-size: .78rem;
  font-weight: 400;
  color: rgba(220,225,235,.72);
  letter-spacing: .06em;
}

/* 下部キャプション */
.db-figcaption {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  padding: 0 4px;
  font-size: .72rem;
  color: var(--gray-500, #8a9096);
  letter-spacing: .04em;
  line-height: 1.6;
}
.db-figcaption i {
  font-size: .7rem;
  opacity: .6;
  flex-shrink: 0;
}

/* ── レスポンシブ ── */
@media (max-width: 960px) {
  .db-frame        { aspect-ratio: 16 / 7; }
  .db-heading      { font-size: 1.25rem; }
  .db-caption-block{ padding: 22px 32px 24px 36px; }
}

@media (max-width: 640px) {
  .db-visual       { margin: 8px 0 40px; }
  .db-frame        { aspect-ratio: 4 / 3; border-radius: 8px; }
  .db-heading      { font-size: 1.05rem; }
  .db-eyebrow      { font-size: .6rem; letter-spacing: .18em; }
  .db-sub          { font-size: .72rem; }
  .db-caption-block{ padding: 16px 20px 18px 22px; gap: 3px; }
  .db-accent-line  { top: 12%; bottom: 12%; }
}

@media (max-width: 400px) {
  .db-frame   { aspect-ratio: 1 / 1; }
  .db-heading { font-size: .95rem; }
}

/* =====================================================
   スーパーK 製品ブリッジビジュアル  .sk-bridge-*
   ===================================================== */

.sk-bridge {
  margin: 0 0 56px;
  padding: 0;
}

.sk-bridge-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  align-items: stretch;
  border-radius: 14px;
  overflow: hidden;
  box-shadow:
    0 2px 4px  rgba(0,0,0,.06),
    0 8px 28px rgba(0,0,0,.10),
    0 24px 56px rgba(10,20,40,.10);
  background: #0b1220;
}

/* ── 左：製品写真エリア ── */
.sk-bridge-fig {
  margin: 0;
  padding: 0;
  position: relative;
  overflow: hidden;
  min-height: 320px;
}

.sk-bridge-img-wrap {
  position: absolute;
  inset: 0;
}

.sk-bridge-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center center;
  display: block;
  transition: transform 1s cubic-bezier(.25,.46,.45,.94);
}

.sk-bridge-inner:hover .sk-bridge-img {
  transform: scale(1.04);
}

/* ── 右：テキストエリア ── */
.sk-bridge-text {
  padding: 48px 44px 48px 48px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 16px;
  background: linear-gradient(
    135deg,
    #0d1628 0%,
    #111e36 60%,
    #0e1a2e 100%
  );
  border-left: 1px solid rgba(180,150,60,.18);
}

/* EYEBROW */
.sk-bridge-eyebrow {
  margin: 0;
  font-family: 'Noto Sans JP', sans-serif;
  font-size: .66rem;
  font-weight: 500;
  letter-spacing: .28em;
  color: rgba(200,175,90,.80);
  text-transform: uppercase;
}

/* 見出し */
.sk-bridge-heading {
  margin: 0;
  font-family: 'Noto Serif JP', serif;
  font-size: 1.52rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: .04em;
  line-height: 1.55;
}

/* 本文 */
.sk-bridge-desc {
  margin: 0;
  font-size: .88rem;
  line-height: 1.85;
  color: rgba(210,220,235,.72);
  letter-spacing: .04em;
}
.sk-bridge-desc strong {
  color: rgba(240,230,200,.95);
  font-weight: 600;
}

/* バッジ */
.sk-bridge-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: 4px;
  padding: 7px 16px;
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .08em;
  color: rgba(200,175,90,.90);
  border: 1px solid rgba(180,150,60,.35);
  border-radius: 999px;
  width: fit-content;
}
.sk-bridge-badge i {
  font-size: .7rem;
  opacity: .8;
}

/* ── レスポンシブ ── */
@media (max-width: 860px) {
  .sk-bridge-inner {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto;
  }
  .sk-bridge-fig {
    min-height: 260px;
    position: relative;
  }
  .sk-bridge-img-wrap { position: absolute; }
  .sk-bridge-text {
    padding: 36px 28px;
    border-left: none;
    border-top: 1px solid rgba(180,150,60,.18);
  }
  .sk-bridge-heading { font-size: 1.25rem; }
}

@media (max-width: 480px) {
  .sk-bridge-fig   { min-height: 200px; }
  .sk-bridge-text  { padding: 28px 20px; gap: 12px; }
  .sk-bridge-heading { font-size: 1.1rem; }
  .sk-bridge-desc  { font-size: .82rem; }
}

/* 図解ラッパー */
.sulfation-figure {
  margin: 0 0 48px;
  padding: 0;
}

/* 画像コンテナ: PCは最大幅いっぱい・中央寄せ・影付き */
.sulfation-img-wrap {
  background: var(--gray-100, #f5f5f5);
  border-radius: var(--r-xl);
  overflow: hidden;
  box-shadow: 0 4px 32px rgba(0,0,0,.10), 0 1px 4px rgba(0,0,0,.06);
  line-height: 0; /* 画像下の隙間除去 */
  /* スマートフォンでは横スクロール可能 */
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.sulfation-img {
  display: block;
  width: 100%;
  min-width: 600px;   /* 画像内テキストが潰れないよう最小幅確保 */
  max-width: 100%;
  height: auto;
  object-fit: contain;
}

/* キャプション */
.sulfation-caption {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 10px;
  font-size: .76rem;
  color: var(--text-muted, #999);
  letter-spacing: .03em;
  padding-left: 4px;
}
.sulfation-caption i {
  font-size: .72rem;
  color: var(--green, #1A7A42);
  opacity: .7;
}

/* 補足説明エリア */
.sulfation-supplement {
  margin-bottom: 48px;
}
.sulfation-supplement-inner {
  background: var(--white);
  border: 1px solid var(--gray-200, #e8e8e8);
  border-radius: var(--r-xl);
  padding: clamp(24px, 4vw, 48px);
  box-shadow: var(--shadow-xs);
}

/* 補足タイトル */
.sulfation-supplement-title {
  font-family: var(--font-serif);
  font-size: clamp(1.05rem, 2.2vw, 1.30rem);
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.supplement-label {
  display: inline-block;
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--green);
  background: var(--green-pale, #e8f5ec);
  padding: 3px 11px;
  border-radius: var(--r-sm);
}

/* 本文 */
.sulfation-supplement-inner p {
  font-size: .92rem;
  color: var(--text-light);
  line-height: 1.95;
  margin-bottom: 16px;
}
.sulfation-supplement-inner p:last-of-type { margin-bottom: 0; }

/* キーポイント一覧 */
.sulfation-points {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin: 28px 0;
  padding: 0;
}
.sulfation-point {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 18px;
  background: var(--gray-50, #fafafa);
  border-radius: var(--r-md);
  border: 1px solid var(--gray-200, #e8e8e8);
  transition: box-shadow var(--ease), transform var(--ease);
}
.sulfation-point:hover {
  box-shadow: 0 2px 12px rgba(0,0,0,.07);
  transform: translateY(-1px);
}
.sp-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--green-pale, #e8f5ec);
  border-radius: var(--r-sm);
  color: var(--green);
  font-size: .95rem;
}
.sulfation-point strong {
  display: block;
  font-size: .88rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 3px;
}
.sulfation-point span {
  font-size: .82rem;
  color: var(--text-light);
  line-height: 1.7;
}

/* 注意書き */
.sulfation-note {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-top: 24px;
  padding: 16px 20px;
  background: rgba(255,193,7,.06);
  border: 1px solid rgba(255,193,7,.25);
  border-radius: var(--r-md);
  font-size: .82rem;
  color: var(--text-light);
  line-height: 1.75;
}
.sulfation-note i {
  color: #c8940a;
  flex-shrink: 0;
  margin-top: 2px;
}

/* 次セクションへのCTA */
.sulfation-cta {
  text-align: center;
  padding: 40px 0 8px;
  border-top: 1px solid var(--gray-200, #e8e8e8);
}
.sulfation-cta-lead {
  font-size: .85rem;
  color: var(--text-muted, #888);
  letter-spacing: .06em;
  margin-bottom: 16px;
}
.sulfation-cta .btn {
  gap: 8px;
  padding: 14px 32px;
  font-size: .92rem;
  font-weight: 500;
  letter-spacing: .04em;
}

/* ── SP対応 ── */
@media (max-width: 640px) {
  .sulfation-img-wrap {
    border-radius: var(--r-md);
  }
  .sulfation-point {
    flex-direction: column;
    gap: 10px;
  }
}

/* ======== 旧 proposal スタイル（後方互換・非使用） ======== */
.proposal-flow-wrap {
  margin-bottom: 36px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.proposal-flow {
  display: flex;
  gap: 0;
  min-width: 600px;
  counter-reset: flow-counter;
}

.flow-item {
  flex: 1;
  position: relative;
  padding: 28px 20px 24px;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.1);
  border-right: none;
  text-align: center;
  transition: background var(--ease);
}
.flow-item:first-child { border-radius: var(--r-lg) 0 0 var(--r-lg); }
.flow-item:last-child  { border-right: 1px solid rgba(45,179,96,.45); border-radius: 0 var(--r-lg) var(--r-lg) 0; }
.flow-item.highlight {
  background: rgba(26,122,66,.2);
  border-color: rgba(45,179,96,.45);
  border-right: 1px solid rgba(45,179,96,.45);
}

/* Arrow via pseudo */
.flow-item:not(:last-child)::after {
  content: '';
  position: absolute;
  right: -14px;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 0;
  border-top: 14px solid transparent;
  border-bottom: 14px solid transparent;
  border-left: 14px solid rgba(255,255,255,.1);
  z-index: 1;
}
.flow-item.highlight:not(:last-child)::after {
  border-left-color: rgba(45,179,96,.35);
}

.flow-item-num {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 700;
  color: rgba(255,255,255,.18);
  line-height: 1;
  margin-bottom: 10px;
}
.flow-item.highlight .flow-item-num { color: rgba(45,179,96,.5); }

.flow-item-icon {
  font-size: 1.5rem;
  color: var(--green-light);
  margin-bottom: 10px;
}
.flow-item-title {
  font-size: .88rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 8px;
  line-height: 1.4;
}
.flow-item-desc {
  font-size: .78rem;
  color: rgba(255,255,255,.6);
  line-height: 1.7;
}

/* Disclaimer */
.proposal-disclaimer {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,200,0,.2);
  border-radius: var(--r-md);
  padding: 18px 22px;
  font-size: .84rem;
  color: rgba(255,255,255,.75);
  line-height: 1.8;
  margin-bottom: 36px;
}
.proposal-disclaimer i {
  color: #F4C430;
  font-size: 1.1rem;
  flex-shrink: 0;
  margin-top: 2px;
}
.proposal-disclaimer strong { color: #F4C430; }

/* Points */
.proposal-points {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}

.proposal-point {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 20px;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--r-lg);
  transition: background var(--ease), border-color var(--ease);
}
.proposal-point:hover {
  background: rgba(255,255,255,.09);
  border-color: rgba(45,179,96,.3);
}
.proposal-point > i {
  color: var(--green-light);
  font-size: 1.15rem;
  flex-shrink: 0;
  margin-top: 2px;
}
.proposal-point > div strong {
  display: block;
  font-size: .92rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 3px;
}
.proposal-point > div span {
  font-size: .82rem;
  color: rgba(255,255,255,.6);
  line-height: 1.65;
}

/* ==============================
   12. SECTION: スーパーK
   ============================== */
.superk-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(32px, 5vw, 68px);
  align-items: start;
  margin-bottom: 56px;
}

.superk-visual { display: flex; flex-direction: column; gap: 16px; }
.superk-tech-label {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--navy);
  border-radius: var(--r-md);
  color: var(--green-light);
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .08em;
}

.superk-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: var(--green-pale);
  color: var(--green);
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .08em;
  padding: 5px 14px;
  border-radius: var(--r-sm);
  margin-bottom: 16px;
  border: 1px solid var(--green-border);
}

.superk-subtitle {
  font-family: var(--font-serif);
  font-size: clamp(1.15rem, 2.5vw, 1.55rem);
  font-weight: 600;
  color: var(--navy);
  line-height: 1.45;
  margin-bottom: 18px;
}

.superk-text {
  font-size: .92rem;
  color: var(--text-light);
  line-height: 1.95;
  margin-bottom: 14px;
}

.superk-features {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-block: 24px;
}
.superk-features li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.feature-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  background: var(--green-pale);
  border-radius: var(--r-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--green);
  font-size: .95rem;
  margin-top: 2px;
}
.superk-features li div strong {
  display: block;
  font-size: .9rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 2px;
}
.superk-features li div p {
  font-size: .83rem;
  color: var(--text-light);
  line-height: 1.75;
}

.superk-disclaimer {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: .8rem;
  color: var(--text-muted);
  background: var(--gray-100);
  border-left: 3px solid var(--gray-300);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  padding: 13px 16px;
  line-height: 1.75;
}
.superk-disclaimer i { color: var(--gray-400); flex-shrink: 0; margin-top: 2px; }

/* 対応電池タイプ */
.superk-types {
  background: var(--gray-50);
  border-radius: var(--r-xl);
  padding: clamp(24px, 4vw, 40px);
  border: 1px solid var(--gray-200);
}
.superk-types-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--navy);
  display: flex;
  align-items: center;
  gap: 8px;
}
.superk-types-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}
.superk-type-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  background: var(--white);
  border-radius: var(--r-md);
  border: 1px solid var(--gray-200);
  font-size: .83rem;
  font-weight: 500;
  color: var(--text-mid);
  transition: border-color var(--ease), box-shadow var(--ease);
}
.superk-type-item:hover { border-color: var(--green-border); box-shadow: var(--shadow-xs); }
.superk-type-item i { color: var(--green); font-size: .95rem; flex-shrink: 0; }
.superk-types-note {
  font-size: .78rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ==============================
   13. SECTION: 仕組み
   ============================== */
/* サルフェーション説明 */
.mech-sulfation {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
  margin-bottom: 56px;
  background: var(--white);
  border-radius: var(--r-xl);
  padding: clamp(24px, 4vw, 44px);
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-xs);
}
.mech-sulfation-text h3 {
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 2.2vw, 1.4rem);
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 16px;
  line-height: 1.4;
}
.mech-num {
  display: inline-block;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--green);
  background: var(--green-pale);
  padding: 3px 10px;
  border-radius: var(--r-sm);
  margin-right: 8px;
  vertical-align: middle;
}
.mech-sulfation-text p {
  font-size: .9rem;
  color: var(--text-light);
  line-height: 1.9;
  margin-bottom: 14px;
}

.mech-formula {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--navy-deep);
  border-radius: var(--r-md);
  padding: 16px 20px;
  margin-top: 18px;
}
.mech-formula span {
  font-family: 'Courier New', Consolas, monospace;
  font-size: .82rem;
  color: rgba(255,255,255,.82);
  line-height: 1.7;
}
.mech-formula span:last-child { color: var(--green-light); }

/* ================================================
   スーパーK重要性ブロック — 左:本文 / 右:PDF資料
   ================================================ */
.mech-superk-block {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: clamp(32px, 5vw, 64px);
  align-items: start;
  margin-bottom: 56px;
  background: var(--white);
  border-radius: var(--r-xl);
  padding: clamp(28px, 4vw, 48px);
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-xs);
}

/* 左: 本文エリア */
.mech-superk-text p {
  font-size: .94rem;
  color: var(--text-light);
  line-height: 1.95;
  margin-bottom: 18px;
}
.mech-superk-text p:last-of-type {
  margin-bottom: 0;
}
.mech-superk-pdf-lead {
  font-size: .88rem !important;
  color: var(--text-muted, #888) !important;
  margin-top: 28px !important;
  margin-bottom: 12px !important;
  border-top: 1px solid var(--gray-200);
  padding-top: 20px;
}

/* PDFボタンラッパー */
.mech-superk-pdf-btn-wrap {
  margin-top: 4px;
}

/* PDFボタン本体 */
.btn-pdf {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  padding: 14px 22px;
  background: #f4f9f5;
  border: 1.5px solid rgba(34, 139, 60, .30);
  border-radius: var(--r-md);
  text-decoration: none;
  color: var(--navy);
  transition: background var(--ease), border-color var(--ease),
              box-shadow var(--ease), transform var(--ease);
  max-width: 100%;
}
.btn-pdf:hover {
  background: #e8f5ec;
  border-color: var(--green);
  box-shadow: 0 4px 16px rgba(34, 139, 60, .15);
  transform: translateY(-1px);
}
.btn-pdf-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--green);
  border-radius: var(--r-sm);
  color: #fff;
  font-size: 1.2rem;
}
.btn-pdf-label {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.btn-pdf-title {
  font-size: .9rem;
  font-weight: 600;
  color: var(--navy);
  letter-spacing: .02em;
}
.btn-pdf-sub {
  font-size: .72rem;
  color: var(--text-muted, #888);
  letter-spacing: .05em;
}
.btn-pdf-arrow {
  margin-left: auto;
  color: var(--green);
  font-size: .85rem;
  flex-shrink: 0;
}
.btn-pdf-note {
  margin-top: 10px;
  font-size: .76rem;
  color: var(--text-muted, #999);
  line-height: 1.6;
}

/* 右: PDFビジュアルカード */
.mech-superk-pdf-visual {
  position: sticky;
  top: calc(var(--banner-h) + var(--header-h) + 24px);
}
.pdf-visual-card {
  background: linear-gradient(145deg, #f8faf8 0%, #f0f6f1 100%);
  border: 1.5px solid rgba(34, 139, 60, .20);
  border-radius: var(--r-xl);
  padding: 28px 24px;
  text-align: center;
  box-shadow: 0 2px 16px rgba(0,0,0,.06);
  position: relative;
  overflow: hidden;
}
.pdf-visual-card::before {
  content: '';
  position: absolute;
  top: -30px; right: -30px;
  width: 100px; height: 100px;
  background: rgba(34, 139, 60, .06);
  border-radius: 50%;
}
.pdf-visual-icon {
  font-size: 3.2rem;
  color: #e53e3e;
  margin-bottom: 16px;
  filter: drop-shadow(0 2px 6px rgba(229,62,62,.25));
}
.pdf-visual-info {
  margin-bottom: 18px;
}
.pdf-visual-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 6px;
  letter-spacing: .04em;
}
.pdf-visual-sub {
  font-size: .78rem;
  color: var(--text-light);
  line-height: 1.7;
}
.pdf-visual-badge {
  display: inline-block;
  padding: 4px 16px;
  background: rgba(34,139,60,.12);
  color: #1a6e2a;
  border-radius: 100px;
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .08em;
}

/* ── レスポンシブ: SP では縦1カラムに ── */
@media (max-width: 768px) {
  .mech-superk-block {
    grid-template-columns: 1fr;
  }
  .mech-superk-pdf-visual {
    position: static;
    order: -1;           /* SP: アイコンを本文の上に */
  }
  .pdf-visual-card {
    display: flex;
    align-items: center;
    gap: 18px;
    text-align: left;
    padding: 18px 20px;
  }
  .pdf-visual-icon {
    font-size: 2.4rem;
    margin-bottom: 0;
    flex-shrink: 0;
  }
  .pdf-visual-info {
    margin-bottom: 0;
    flex: 1;
  }
  .pdf-visual-badge {
    display: none;
  }
  .mech-superk-pdf-btn-wrap {
    width: 100%;
  }
  .btn-pdf {
    width: 100%;
    justify-content: flex-start;
  }
}

/* Steps heading */
.mech-steps-heading {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 24px;
  padding-left: 14px;
  border-left: 4px solid var(--green);
}

/* Mechanism steps grid */
.mechanism-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  margin-bottom: 32px;
  counter-reset: step-counter;
}

.mechanism-step {
  background: var(--white);
  border-radius: var(--r-xl);
  padding: 24px;
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-xs);
  transition: box-shadow var(--ease), transform var(--ease);
}
.mechanism-step:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.step-number {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 700;
  color: var(--gray-200);
  line-height: 1;
  margin-bottom: 12px;
}

.step-img { margin-bottom: 12px; }

.step-content h4 {
  font-size: .98rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 8px;
}
.step-content p {
  font-size: .85rem;
  color: var(--text-light);
  line-height: 1.85;
  margin-bottom: 12px;
}

.step-checklist {
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.step-checklist li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: .8rem;
  color: var(--text-mid);
  line-height: 1.55;
}
.step-checklist li i {
  color: var(--green);
  font-size: .8rem;
  flex-shrink: 0;
  margin-top: 2px;
}

/* Mechanism note */
.mechanism-note {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: var(--gray-100);
  border-radius: var(--r-md);
  padding: 16px 20px;
  font-size: .83rem;
  color: var(--text-light);
  line-height: 1.8;
}
.mechanism-note i { color: var(--navy-light); flex-shrink: 0; margin-top: 2px; font-size: 1rem; }

/* ======================================================
   13b. SECTION: スーパーKを使用することの重要性（製品の重要性）
   sk-* プレフィックス — 完全版
   ====================================================== */

/* ─── ページ全体ラッパー ─── */
.sk-page-section {
  padding: 0;
  background: var(--gray-50);
}
.sk-page-body {
  padding-top: clamp(48px, 6vw, 80px);
  padding-bottom: clamp(64px, 8vw, 108px);
  display: flex;
  flex-direction: column;
  gap: 40px;
}

/* ─── ① ファーストビュー（ヒーロー） ─── */
.sk-hero {
  background:
    linear-gradient(160deg, rgba(7,24,40,.85) 0%, rgba(12,35,64,.75) 50%, rgba(21,54,96,.65) 100%),
    url('https://images.unsplash.com/photo-1592659762303-90081d34b277?w=1400&q=80') center/cover no-repeat;
  padding: clamp(56px, 8vw, 100px) 24px;
  text-align: center;
}
.sk-hero-inner {
  max-width: 900px;
  margin: 0 auto;
}
.sk-hero-eyebrow {
  font-size: .75rem;
  font-weight: 800;
  letter-spacing: .18em;
  color: rgba(255,255,255,.55);
  margin: 0 0 18px;
}
.sk-hero-title {
  font-family: var(--font-serif);
  font-size: clamp(1.7rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--white);
  line-height: 1.3;
  letter-spacing: -.02em;
  margin: 0 0 20px;
}
.sk-hero-subtitle {
  font-size: clamp(.95rem, 1.8vw, 1.15rem);
  color: rgba(255,255,255,.82);
  line-height: 1.75;
  margin: 0;
  font-style: normal;
}
.sk-hero-subtitle em {
  font-style: normal;
  color: #7dd3b0;
  font-weight: 700;
  border-bottom: 1px solid rgba(125,211,176,.5);
  padding-bottom: 1px;
}

/* ─── 共通キーワード強調 ─── */
.sk-kw {
  color: var(--navy-mid);
  font-weight: 700;
  border-bottom: 2px solid rgba(28,72,128,.3);
  padding-bottom: 1px;
}

/* ─── 参照文献（cite） ─── */
.sk-cite {
  font-style: italic;
  font-size: .78rem;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.sk-cite i { font-size: .78rem; color: var(--gray-400); }

/* ─── 共通：article カード ─── */
.sk-article {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-xl);
  box-shadow: 0 2px 12px rgba(12,35,64,.06);
  overflow: hidden;
}
.sk-article-header {
  padding: 28px 36px 0;
  border-bottom: 0;
}
.sk-article-tag {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .08em;
  color: var(--navy-mid);
  background: rgba(21,54,96,.07);
  border-radius: 4px;
  padding: 4px 10px;
  margin-bottom: 12px;
}
.sk-article-title {
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 2.2vw, 1.55rem);
  font-weight: 700;
  color: var(--navy);
  line-height: 1.45;
  margin: 0 0 22px;
}
.sk-article-body {
  padding: 0 36px 28px;
}
.sk-article-body p {
  font-size: .97rem;
  color: var(--text-mid);
  line-height: 2;
  margin: 0 0 16px;
}
.sk-article-body p:last-child { margin-bottom: 0; }
.sk-article-footer {
  padding: 16px 36px 24px;
  border-top: 1px solid var(--gray-100);
  background: var(--gray-50);
}

/* ─── ② 比較グリッド ─── */
.sk-compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  margin: 0 36px 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--gray-200);
  margin-bottom: 28px;
  box-shadow: 0 1px 8px rgba(12,35,64,.05);
}
.sk-compare-card {
  padding: 28px 28px 24px;
}
.sk-compare-card--without {
  background: #fdf8f8;
  border-right: 1px solid #e0c8c8;
}
.sk-compare-card--with {
  background: #f5faf7;
}
.sk-compare-head { margin-bottom: 16px; }
.sk-compare-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 14px;
  border-radius: 6px;
  font-size: .84rem;
  font-weight: 600;
  letter-spacing: .02em;
}
.sk-compare-badge--without {
  background: rgba(192,57,43,.10);
  color: #8b2215;
  border: 1px solid rgba(192,57,43,.2);
}
.sk-compare-badge--with {
  background: rgba(26,122,66,.10);
  color: #145e30;
  border: 1px solid rgba(26,122,66,.2);
}
.sk-compare-badge strong { font-weight: 800; }
.sk-compare-text p {
  font-size: .92rem;
  color: var(--text-mid);
  line-height: 1.9;
  margin: 0 0 14px;
}
.sk-compare-list {
  list-style: none;
  margin: 16px 0 0; padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-top: 1px solid rgba(0,0,0,.06);
  padding-top: 16px;
}
.sk-compare-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: .88rem;
  color: var(--text-mid);
  line-height: 1.7;
}
.sk-compare-icon { flex-shrink: 0; margin-top: 1px; font-size: .95rem; }
.sk-compare-icon--warn { color: #b03a2e; }
.sk-compare-icon--ok   { color: var(--green); }
.sk-compare-footer {
  padding: 14px 28px 0;
  border-top: 1px solid rgba(0,0,0,.06);
  margin-top: 18px;
}

/* ─── ④ 点反応→面反応：図解 ─── */
.sk-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  margin: 24px 36px 32px;
  padding: 28px;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-lg);
  flex-wrap: wrap;
}
.sk-diagram-box {
  flex: 1;
  min-width: 160px;
  max-width: 240px;
  border-radius: var(--r-lg);
  padding: 22px 18px;
  text-align: center;
  box-shadow: 0 1px 6px rgba(0,0,0,.06);
}
.sk-diagram-box--before {
  background: #fdf8f8;
  border: 1px solid #e0c0c0;
}
.sk-diagram-box--after {
  background: #f3faf6;
  border: 1px solid #a8d4b8;
}
.sk-diagram-label {
  font-size: .74rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: .05em;
  margin: 0 0 16px;
  text-transform: uppercase;
}
.sk-diagram-visual { margin-bottom: 14px; }
.sk-electrode-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 5px;
  width: 75px;
  margin: 0 auto;
}
.sk-dot {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--gray-200);
  display: block;
  transition: background .3s;
}
.sk-dot--active { background: var(--navy-light); }
.sk-electrode-grid--surface .sk-dot--active { background: var(--green-mid); }
.sk-diagram-caption {
  font-size: .82rem;
  color: var(--text-mid);
  margin: 0;
  line-height: 1.6;
}
.sk-diagram-arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--navy-mid);
  font-size: .78rem;
  text-align: center;
  flex-shrink: 0;
  line-height: 1.5;
}
.sk-diagram-arrow i {
  font-size: 1.8rem;
  color: var(--navy-mid);
  opacity: .7;
}

/* ─── 焚火の例え ─── */
.sk-analogy-box {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  background: linear-gradient(135deg, #fffdf5 0%, #fef9e7 100%);
  border: 1px solid #e6d08a;
  border-left: 5px solid #c9973f;
  border-radius: 0 var(--r-lg) var(--r-lg) 0;
  padding: 24px 30px;
  margin: 0 36px 0;
}
.sk-analogy-icon {
  font-size: 2rem;
  color: #c17f24;
  flex-shrink: 0;
  margin-top: 2px;
  line-height: 1;
}
.sk-analogy-title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: .95rem;
  color: #7d5a1a;
  margin: 0 0 10px;
  letter-spacing: .02em;
}
.sk-analogy-text {
  font-size: .93rem;
  color: #5a4010;
  line-height: 2;
  margin: 0;
}

/* ─── ⑤ 本質：3カード ─── */
.sk-essence-intro {
  padding: 0 36px 20px;
  border-bottom: 1px solid var(--gray-100);
  margin-bottom: 28px;
}
.sk-essence-intro p {
  font-size: .97rem;
  color: var(--text-mid);
  line-height: 2;
  margin: 0;
}
.sk-essence-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  padding: 0 36px;
  margin-bottom: 28px;
}
.sk-essence-card {
  padding: 24px 20px;
  border-right: 1px solid var(--gray-100);
}
.sk-essence-card:first-child { padding-left: 0; }
.sk-essence-card:last-child  { border-right: 0; padding-right: 0; }
.sk-essence-icon {
  font-size: 1.25rem;
  color: var(--navy-mid);
  margin-bottom: 12px;
}
.sk-essence-title {
  font-size: .93rem;
  font-weight: 700;
  color: var(--navy);
  margin: 0 0 10px;
  line-height: 1.45;
  border-bottom: 2px solid var(--gray-100);
  padding-bottom: 8px;
}
.sk-essence-card p {
  font-size: .86rem;
  color: var(--text-light);
  line-height: 1.9;
  margin: 0;
}
.sk-essence-result {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: linear-gradient(135deg, var(--gray-50), var(--gray-100));
  border: 1px solid var(--gray-200);
  border-left: 4px solid var(--navy-mid);
  border-radius: 0 var(--r-lg) var(--r-lg) 0;
  padding: 22px 28px;
  margin: 0 36px 36px;
}
.sk-essence-result-icon {
  color: var(--navy-mid);
  font-size: .9rem;
  flex-shrink: 0;
  margin-top: 4px;
}
.sk-essence-result p {
  font-size: .95rem;
  color: var(--text-mid);
  line-height: 1.95;
  margin: 0;
}

/* ─── ⑥ 結論ブロック ─── */
.sk-conclusion {
  background: linear-gradient(155deg, var(--navy-deep) 0%, var(--navy) 55%, var(--navy-mid) 100%);
  border-radius: var(--r-xl);
  padding: clamp(48px, 7vw, 80px) clamp(32px, 6vw, 72px);
  text-align: center;
  box-shadow: 0 8px 40px rgba(7,24,40,.25);
  position: relative;
  overflow: hidden;
}
.sk-conclusion::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 85% 15%, rgba(125,211,176,.12), transparent 35%),
    radial-gradient(circle at 15% 85%, rgba(255,255,255,.04), transparent 30%);
  pointer-events: none;
}
.sk-conclusion-eyebrow {
  font-size: .7rem;
  font-weight: 800;
  letter-spacing: .2em;
  color: rgba(255,255,255,.4);
  margin: 0 0 14px;
}
.sk-conclusion-sub {
  font-size: clamp(.88rem, 1.5vw, 1rem);
  color: rgba(255,255,255,.65);
  margin: 0 0 20px;
  line-height: 1.7;
}
.sk-conclusion-message {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 4vw, 2.8rem);
  font-weight: 700;
  color: var(--white);
  line-height: 1.3;
  letter-spacing: -.02em;
  margin: 0 0 36px;
}
.sk-conclusion-message strong {
  color: #7dd3b0;
  text-decoration: underline;
  text-decoration-color: rgba(125,211,176,.4);
  text-underline-offset: 4px;
}
.sk-conclusion-divider {
  width: 60px;
  height: 1px;
  background: rgba(255,255,255,.25);
  margin: 0 auto 32px;
}
.sk-conclusion-statement {
  max-width: 680px;
  margin: 0 auto;
  font-size: clamp(.88rem, 1.5vw, 1rem);
  color: rgba(255,255,255,.78);
  line-height: 2.1;
}
.sk-conclusion-statement strong {
  color: #7dd3b0;
  font-weight: 700;
}

/* ─── レスポンシブ ─── */
@media (max-width: 900px) {
  .sk-compare-grid  { grid-template-columns: 1fr; }
  .sk-compare-card--without { border-right: 0; border-bottom: 1px solid #e0c8c8; }
  .sk-essence-grid  { grid-template-columns: 1fr; }
  .sk-essence-card  { border-right: 0; border-bottom: 1px solid var(--gray-100); padding-left: 0; padding-right: 0; }
  .sk-essence-card:last-child { border-bottom: 0; }
}
@media (max-width: 640px) {
  .sk-article-header { padding: 22px 20px 0; }
  .sk-article-body   { padding: 0 20px 22px; }
  .sk-article-footer { padding: 12px 20px 18px; }
  .sk-compare-grid   { margin: 0 20px 24px; }
  .sk-compare-card   { padding: 22px 18px; }
  .sk-diagram        { margin: 20px 20px 26px; padding: 20px; gap: 18px; }
  .sk-analogy-box    { margin: 0 20px; flex-direction: column; gap: 12px; padding: 20px; }
  .sk-essence-intro  { padding: 0 20px 18px; }
  .sk-essence-grid   { padding: 0 20px; }
  .sk-essence-result { margin: 0 20px 28px; padding: 18px 20px; }
  .sk-conclusion     { padding: 36px 24px; border-radius: var(--r-lg); }
}

/* ======================================================
   14. SECTION: 開発者 小澤博士とスーパーK（コンパクト版）
   dev-* プレフィックス
   ====================================================== */

/* ── メイングリッド：写真 | プロフィール＋タイムライン ── */
.dev-main-grid {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 36px;
  align-items: start;
  margin-bottom: 28px;
}

/* 写真カード */
.dev-portrait-card {
  background: linear-gradient(180deg, var(--white), var(--gray-50));
  border: 1px solid var(--gray-200);
  border-radius: var(--r-lg);
  padding: 10px;
  box-shadow: var(--shadow-sm);
}
.dev-portrait-frame {
  border-radius: 10px;
  overflow: hidden;
  aspect-ratio: 4 / 5;
  background: var(--gray-100);
}
.dev-portrait-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 28%;
  display: block;
}
.dev-portrait-caption {
  margin-top: 8px;
  font-size: .75rem;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.5;
}

/* 右カラム */
.dev-right-col {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* リード文 */
.dev-lead-copy {
  padding: 16px 20px;
  background: var(--gray-50);
  border-left: 3px solid #b8963e;
  border-radius: 0 var(--r-md) var(--r-md) 0;
  font-size: .92rem;
  color: var(--text-mid);
  line-height: 1.85;
  margin: 0;
}

/* タイムライン（コンパクト） */
.dev-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 20px;
  position: relative;
}
.dev-timeline::before {
  content: "";
  position: absolute;
  left: 6px; top: 5px; bottom: 5px;
  width: 2px;
  background: linear-gradient(180deg, #b8963e, rgba(12,35,64,.12));
}
.dev-tl-item {
  position: relative;
  display: flex;
  gap: 10px;
  padding-bottom: 10px;
  font-size: .82rem;
  line-height: 1.6;
}
.dev-tl-item:last-child { padding-bottom: 0; }
.dev-tl-item::before {
  content: "";
  position: absolute;
  left: -15px; top: .5em;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: #b8963e;
  box-shadow: 0 0 0 4px rgba(184,150,62,.12);
  flex-shrink: 0;
}
.dev-tl-item--accent::before {
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(26,122,66,.14);
}
.dev-tl-year {
  min-width: 72px;
  font-weight: 700;
  color: var(--navy);
  font-size: .8rem;
  flex-shrink: 0;
}
.dev-tl-text { color: var(--text-light); }

/* ── ボトムグリッド：受賞 | 技術思想 ── */
.dev-bottom-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
}
.dev-info-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-xl);
  padding: 24px;
  box-shadow: var(--shadow-xs);
}
.dev-info-card--quote {
  border-top: 3px solid #b8963e;
}

/* 実績リスト */
.dev-achievement-list {
  list-style: none;
  margin: 0; padding: 0;
  display: flex;
  flex-direction: column;
  gap: 9px;
}
.dev-achievement-list li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: .855rem;
  color: var(--text-mid);
  line-height: 1.65;
}
.dev-ach-tag {
  display: inline-block;
  flex-shrink: 0;
  padding: 1px 7px;
  border-radius: 4px;
  background: rgba(184,150,62,.12);
  color: #8a6a22;
  font-size: .7rem;
  font-weight: 800;
  letter-spacing: .06em;
}

/* 技術思想テキスト */
.dev-philosophy-text {
  font-size: .88rem;
  color: var(--text-mid);
  line-height: 1.9;
  margin: 0 0 16px;
}

/* インライン引用 */
.dev-quote-inline {
  display: flex;
  align-items: flex-start;
  gap: 6px;
  margin: 0;
  padding: 12px 16px;
  background: var(--gray-50);
  border-radius: var(--r-md);
  font-size: .855rem;
  font-style: normal;
  color: var(--text-mid);
  line-height: 1.75;
}
.dev-quote-mark-sm {
  font-size: 1.8rem;
  line-height: .8;
  color: #b8963e;
  font-family: Georgia, serif;
  flex-shrink: 0;
}

/* ── レスポンシブ ── */
@media (max-width: 860px) {
  .dev-main-grid  { grid-template-columns: 180px 1fr; gap: 24px; }
  .dev-bottom-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .dev-main-grid  { grid-template-columns: 1fr; }
  .dev-portrait-card { max-width: 200px; }
  .dev-info-card { padding: 18px; }
}

/* ==============================
   15. SECTION: 導入メリット
   ============================== */
.merit-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 22px;
  margin-bottom: 28px;
}

.merit-card {
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--r-xl);
  padding: 30px 24px;
  transition: background var(--ease), border-color var(--ease), transform var(--ease);
}
.merit-card:hover {
  background: rgba(255,255,255,.09);
  border-color: rgba(45,179,96,.35);
  transform: translateY(-4px);
}

.merit-icon {
  width: 50px;
  height: 50px;
  background: rgba(26,122,66,.2);
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--green-light);
  font-size: 1.2rem;
  margin-bottom: 16px;
}

.merit-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 10px;
  line-height: 1.4;
}
.merit-card p {
  font-size: .85rem;
  color: rgba(255,255,255,.62);
  line-height: 1.88;
}

.merit-note {
  font-size: .8rem;
  color: rgba(255,255,255,.38);
  text-align: center;
  line-height: 1.7;
}

/* ==============================
   16. SECTION: モニター・実証
   ============================== */
.monitor-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 48px;
  align-items: start;
}

.monitor-steps-title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 24px;
  padding-left: 14px;
  border-left: 4px solid var(--green);
}

.monitor-step-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.monitor-step {
  display: flex;
  gap: 18px;
  padding: 22px 0;
  border-bottom: 1px solid var(--gray-200);
}
.monitor-step:last-child { border-bottom: none; }

.monitor-step-num {
  flex-shrink: 0;
  background: var(--navy);
  color: var(--white);
  font-size: .64rem;
  font-weight: 800;
  letter-spacing: .1em;
  text-align: center;
  line-height: 1.3;
  padding: 7px 8px;
  border-radius: var(--r-sm);
  min-width: 46px;
  height: fit-content;
  margin-top: 2px;
}

.monitor-step-body h4 {
  font-size: .96rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 6px;
}
.monitor-step-body p {
  font-size: .855rem;
  color: var(--text-light);
  line-height: 1.85;
}
.monitor-step-note {
  font-size: .78rem;
  color: var(--text-muted);
  margin-top: 6px;
  font-style: italic;
}

/* Sidebar */
.monitor-sidebar { display: flex; flex-direction: column; gap: 20px; }

.monitor-cta-box {
  background: var(--navy);
  border-radius: var(--r-xl);
  padding: 28px 24px;
  color: var(--white);
}
.monitor-cta-box h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.45;
}
.monitor-cta-box p {
  font-size: .84rem;
  color: rgba(255,255,255,.68);
  line-height: 1.85;
  margin-bottom: 20px;
}

/* FAQ */
.monitor-faq {
  background: var(--gray-50);
  border-radius: var(--r-xl);
  padding: 22px 22px;
  border: 1px solid var(--gray-200);
}
.monitor-faq h3 {
  font-size: .96rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--gray-200);
}
.monitor-faq dl { display: flex; flex-direction: column; gap: 0; }
.monitor-faq dt {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: .84rem;
  font-weight: 700;
  color: var(--navy);
  padding: 12px 0 4px;
}
.monitor-faq dt i { color: var(--green); flex-shrink: 0; margin-top: 2px; font-size: .85rem; }
.monitor-faq dd {
  font-size: .8rem;
  color: var(--text-light);
  line-height: 1.75;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--gray-200);
  padding-left: 20px;
}
.monitor-faq dd:last-child { border-bottom: none; padding-bottom: 0; }

/* ==============================
   17. SECTION: 研究開発
   ============================== */
.rd-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 22px;
  margin-bottom: 44px;
}

.rd-item {
  text-align: center;
  padding: 34px 22px 28px;
  border-radius: var(--r-xl);
  border: 1px solid var(--gray-200);
  background: var(--white);
  box-shadow: var(--shadow-xs);
  transition: box-shadow var(--ease), transform var(--ease), border-color var(--ease);
}
.rd-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
  border-color: var(--gray-300);
}

.rd-icon {
  width: 56px;
  height: 56px;
  background: var(--navy);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 1.25rem;
  margin: 0 auto 16px;
}
.rd-item h3 {
  font-size: .96rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 10px;
}
.rd-item p {
  font-size: .845rem;
  color: var(--text-light);
  line-height: 1.85;
}

/* 連携形態 */
.rd-collab-types {
  margin-bottom: 40px;
  padding: clamp(24px, 4vw, 40px);
  background: var(--gray-50);
  border-radius: var(--r-xl);
  border: 1px solid var(--gray-200);
}
.rd-collab-heading {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 20px;
  padding-left: 14px;
  border-left: 4px solid var(--green);
}
.rd-collab-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
}
.rd-collab-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 16px 18px;
  background: var(--white);
  border-radius: var(--r-lg);
  border: 1px solid var(--gray-200);
  transition: box-shadow var(--ease);
}
.rd-collab-item:hover { box-shadow: var(--shadow-sm); }
.rd-collab-item i {
  color: var(--navy);
  font-size: 1.15rem;
  flex-shrink: 0;
  margin-top: 2px;
  width: 20px;
  text-align: center;
}
.rd-collab-item strong {
  display: block;
  font-size: .88rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 3px;
}
.rd-collab-item p {
  font-size: .8rem;
  color: var(--text-light);
  line-height: 1.7;
}

/* Banner */
.rd-collab-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  flex-wrap: wrap;
  padding: clamp(28px, 4vw, 48px) clamp(24px, 5vw, 56px);
  background: linear-gradient(115deg, var(--navy) 0%, var(--navy-light) 100%);
  border-radius: var(--r-xl);
}
.rd-collab-text h3 {
  font-size: clamp(1rem, 2vw, 1.3rem);
  font-weight: 700;
  color: var(--white);
  margin-bottom: 10px;
}
.rd-collab-text p {
  font-size: .87rem;
  color: rgba(255,255,255,.7);
  line-height: 1.85;
  max-width: 560px;
}

/* ==============================
   18. SECTION: 会社概要
   ============================== */
.company-table-wrap {
  max-width: 720px;
  margin: 0 auto;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-xl);
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(12,35,64,.06);
}

.company-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .9rem;
}
.company-table th,
.company-table td {
  padding: 15px 24px;
  text-align: left;
  border-bottom: 1px solid var(--gray-100);
  vertical-align: middle;
  line-height: 1.7;
}
.company-table th {
  width: 28%;
  color: var(--navy);
  font-weight: 700;
  font-size: .82rem;
  background: var(--gray-50);
  white-space: nowrap;
  letter-spacing: .02em;
}
.company-table td { color: var(--text-mid); }
.company-table a {
  color: var(--navy-mid);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.company-table a:hover { color: var(--green-mid); }
.company-table tr:last-child th,
.company-table tr:last-child td { border-bottom: none; }

/* ==============================
   19. SECTION: お問い合わせ
   ============================== */
.contact-layout {
  display: block;
  max-width: 760px;
  margin: 0 auto;
}

/* Form */
.contact-form .form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 18px;
}

.form-group label {
  font-size: .84rem;
  font-weight: 700;
  color: var(--navy);
}

.required {
  display: inline-block;
  font-size: .67rem;
  font-weight: 700;
  background: var(--danger);
  color: var(--white);
  padding: 1px 6px;
  border-radius: 2px;
  margin-left: 5px;
  vertical-align: middle;
}

.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form input[type="tel"],
.contact-form select,
.contact-form textarea {
  padding: 11px 15px;
  border: 1.5px solid var(--gray-300);
  border-radius: var(--r-md);
  font-size: .92rem;
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--white);
  transition: border-color var(--ease), box-shadow var(--ease);
  width: 100%;
  -webkit-appearance: none;
}
.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(26,122,66,.11);
}
.contact-form select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath fill='%235A6B7D' d='M8 11L2 5h12z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 14px;
  padding-right: 36px;
}
.contact-form textarea { resize: vertical; }

.form-hint {
  font-size: .77rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.form-check-group { margin-bottom: 14px; }
.form-check-label {
  display: inline-flex;
  align-items: flex-start;
  gap: 9px;
  cursor: pointer;
  font-size: .88rem;
  color: var(--text-light);
  font-weight: 400;
  line-height: 1.6;
}
.form-check-label input[type="checkbox"] {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
  accent-color: var(--green);
  cursor: pointer;
  margin-top: 2px;
}

.link-underline { color: var(--green); text-decoration: underline; }

.form-submit { text-align: center; margin: 8px 0 0; }

.form-notice {
  margin-top: 16px;
  padding: 14px 16px;
  background: var(--gray-50);
  border-radius: var(--r-md);
  font-size: .78rem;
  color: var(--text-muted);
  line-height: 1.75;
  display: flex;
  flex-direction: column;
  gap: 4px;
}



/* ==============================
   20. FOOTER
   ============================== */
.site-footer {
  background: var(--gray-900);
  color: rgba(255,255,255,.68);
  position: relative;
}

.footer-inner { padding-block: 56px 0; }

.footer-top {
  display: flex;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
  margin-bottom: 44px;
  padding-bottom: 44px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}

/* Brand */
.footer-brand { max-width: 280px; }
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.footer-logo strong {
  display: block;
  color: var(--white);
  font-size: .95rem;
  font-weight: 700;
  margin-bottom: 1px;
}
.footer-logo span {
  font-size: .63rem;
  letter-spacing: .05em;
  color: rgba(255,255,255,.45);
}
.footer-tagline {
  font-size: .82rem;
  color: rgba(255,255,255,.5);
  line-height: 1.8;
}

/* Footer nav */
.footer-nav {
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
}
.footer-nav-col h4 {
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: rgba(255,255,255,.4);
  margin-bottom: 12px;
}
.footer-nav-col ul { display: flex; flex-direction: column; gap: 8px; }
.footer-nav-col ul li a {
  font-size: .82rem;
  color: rgba(255,255,255,.6);
  transition: color var(--ease);
}
.footer-nav-col ul li a:hover { color: var(--green-light); }

/* Footer disclaimer */
.footer-disclaimer {
  padding: 20px 24px;
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: var(--r-lg);
  margin-bottom: 28px;
  font-size: .77rem;
  color: rgba(255,255,255,.42);
  line-height: 1.8;
}
.footer-disclaimer strong { color: rgba(255,255,255,.55); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding-block: 20px 24px;
  border-top: 1px solid rgba(255,255,255,.06);
}
.footer-copy { font-size: .75rem; color: rgba(255,255,255,.35); }

.footer-links {
  display: flex;
  gap: 20px;
}
.footer-links a {
  font-size: .75rem;
  color: rgba(255,255,255,.38);
  transition: color var(--ease);
}
.footer-links a:hover { color: var(--green-light); }

/* Page Top */
.page-top-btn {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 900;
  width: 44px;
  height: 44px;
  background: var(--green);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .95rem;
  box-shadow: var(--shadow-md);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--ease), background var(--ease), transform var(--ease);
}
.page-top-btn.show { opacity: 1; pointer-events: auto; }
.page-top-btn:hover { background: var(--green-mid); transform: translateY(-3px); }

/* ==============================
   21. Scroll Animations
   ============================== */
.anim-fade-up,
.issue-card,
.merit-card,
.testdata-card,
.rd-item,
.mechanism-step,
.anim-slide-right {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .55s ease, transform .55s ease;
}
.anim-slide-right { transform: translateX(-20px); }

.anim-fade-up.is-visible,
.issue-card.is-visible,
.merit-card.is-visible,
.testdata-card.is-visible,
.rd-item.is-visible,
.mechanism-step.is-visible,
.anim-slide-right.is-visible {
  opacity: 1;
  transform: none;
}


/* ==============================
   BGM コントローラー
   ============================== */
.bgm-ctrl {
  position: fixed;
  bottom: 28px;
  right: 28px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
  pointer-events: none; /* 子要素のみ操作可 */
}

/* ── スタートボタン（自動再生失敗時） ── */
.bgm-start-btn {
  display: none; /* JS で flex に切替 */
  align-items: center;
  gap: 8px;
  background: rgba(12, 35, 64, 0.88);
  color: #fff;
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 999px;
  padding: 10px 20px;
  font-size: .82rem;
  font-weight: 500;
  letter-spacing: .06em;
  cursor: pointer;
  pointer-events: auto;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 4px 20px rgba(0,0,0,.28);
  transition: background .2s, transform .2s;
}
.bgm-start-btn:hover {
  background: rgba(27, 74, 128, 0.95);
  transform: translateY(-2px);
}
.bgm-start-btn i { font-size: .8rem; opacity: .8; }

/* ── ミニコントロール（再生中） ── */
.bgm-mini {
  display: none; /* JS で flex に切替 */
  align-items: center;
  gap: 6px;
  background: rgba(12, 35, 64, 0.82);
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 999px;
  padding: 6px 14px 6px 8px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 4px 24px rgba(0,0,0,.25);
  pointer-events: auto;
}

.bgm-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: rgba(255,255,255,.75);
  font-size: .82rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color .18s, background .18s;
  flex-shrink: 0;
}
.bgm-btn:hover { color: #fff; background: rgba(255,255,255,.1); }
.bgm-btn--main {
  background: rgba(255,255,255,.1);
  color: #fff;
}
.bgm-btn--main:hover { background: rgba(255,255,255,.22); }

/* 音量スライダー */
.bgm-vol-wrap {
  display: flex;
  align-items: center;
  width: 72px;
}
.bgm-vol {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 3px;
  border-radius: 999px;
  background: rgba(255,255,255,.25);
  outline: none;
  cursor: pointer;
  accent-color: #4caf85; /* ロゴのグリーン系 */
}
.bgm-vol::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 4px rgba(0,0,0,.3);
  cursor: pointer;
}
.bgm-vol::-moz-range-thumb {
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: #fff;
  border: none;
  cursor: pointer;
}

/* BGM ラベル */
.bgm-label {
  font-size: .62rem;
  font-weight: 600;
  letter-spacing: .12em;
  color: rgba(255,255,255,.38);
  user-select: none;
}

/* ≤640px：少し小さく・位置を下げる */
@media (max-width: 640px) {
  .bgm-ctrl { bottom: 18px; right: 16px; }
  .bgm-vol-wrap { width: 54px; }
  .bgm-btn { width: 36px; height: 36px; font-size: .8rem; }
}

/* Stagger delays */
.issue-card:nth-child(1)   { transition-delay: .05s; }
.issue-card:nth-child(2)   { transition-delay: .12s; }
.issue-card:nth-child(3)   { transition-delay: .19s; }
.issue-card:nth-child(4)   { transition-delay: .26s; }

.merit-card:nth-child(1)   { transition-delay: .04s; }
.merit-card:nth-child(2)   { transition-delay: .09s; }
.merit-card:nth-child(3)   { transition-delay: .14s; }
.merit-card:nth-child(4)   { transition-delay: .19s; }
.merit-card:nth-child(5)   { transition-delay: .24s; }
.merit-card:nth-child(6)   { transition-delay: .29s; }

.testdata-card:nth-child(1){ transition-delay: .05s; }
.testdata-card:nth-child(2){ transition-delay: .12s; }
.testdata-card:nth-child(3){ transition-delay: .19s; }

.rd-item:nth-child(1)      { transition-delay: .05s; }
.rd-item:nth-child(2)      { transition-delay: .12s; }
.rd-item:nth-child(3)      { transition-delay: .19s; }
.rd-item:nth-child(4)      { transition-delay: .26s; }

.mechanism-step:nth-child(1){ transition-delay: .05s; }
.mechanism-step:nth-child(2){ transition-delay: .12s; }
.mechanism-step:nth-child(3){ transition-delay: .19s; }
.mechanism-step:nth-child(4){ transition-delay: .26s; }

.monitor-step:nth-child(1) { transition-delay: .04s; }
.monitor-step:nth-child(2) { transition-delay: .09s; }
.monitor-step:nth-child(3) { transition-delay: .14s; }
.monitor-step:nth-child(4) { transition-delay: .19s; }
.monitor-step:nth-child(5) { transition-delay: .24s; }

.proposal-point:nth-child(1){ transition-delay: .04s; }
.proposal-point:nth-child(2){ transition-delay: .09s; }
.proposal-point:nth-child(3){ transition-delay: .14s; }
.proposal-point:nth-child(4){ transition-delay: .19s; }

/* ==============================
   21b. Hero Image Fallback & Mobile Perf
   ============================== */
/* images/hero-bg.jpg 読み込み失敗時のフォールバック */
.hero-bg-img--main {
  background-color: #0C2340;
}

/* 画像読み込み失敗時: ディープネイビーグラデーションを表示 */
.hero-bg-img--main.img-fallback {
  background-image:
    linear-gradient(150deg,
      #071828  0%,
      #0C2340 25%,
      #143356 45%,
      #153660 60%,
      #122E20 80%,
      #0E3320 100%
    ) !important;
}

/* モバイル (640px以下): GPU負荷を軽減したシンプルアニメーション */
@media (max-width: 640px) {
  .hero-bg-img--main {
    background-position: center 35%;
    animation: heroPanMobile 14s cubic-bezier(0.37, 0, 0.63, 1) infinite alternate;
  }
  @keyframes heroPanMobile {
    0% {
      transform: scale(1.00);
      filter: brightness(.85) contrast(1.02);
    }
    100% {
      transform: scale(1.08) translate(-1%, -0.8%);
      filter: brightness(.78) contrast(1.04);
    }
  }
}

/* prefers-reduced-motion: アニメーション完全停止（アクセシビリティ） */
@media (prefers-reduced-motion: reduce) {
  .hero-bg-img--main {
    animation: none !important;
    transform: scale(1.05) translate(-1%, -0.5%);
    filter: brightness(.82) contrast(1.03);
    transition: none;
  }
}

/* ==============================
   22. Responsive — Tablet (≤960px)
   ============================== */
@media (max-width: 960px) {
  .superk-layout    { grid-template-columns: 1fr; }
  .mech-sulfation   { grid-template-columns: 1fr; }
  .company-layout   { grid-template-columns: 1fr; }
  .monitor-layout   { grid-template-columns: 1fr; }
  .contact-layout   { grid-template-columns: 1fr; }
  .contact-form .form-row { grid-template-columns: 1fr; }
  .rd-collab-banner { flex-direction: column; text-align: center; }
  .issue-data-row   { grid-template-columns: 1fr; gap: 14px; }

  .footer-top { flex-direction: column; }
  .footer-nav { flex-wrap: wrap; gap: 28px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}

/* ==============================
   23. Responsive — Mobile (≤640px)
   ============================== */
@media (max-width: 640px) {
  :root { --header-h: 74px; }

  /* 上部バナー */
  .site-top-banner {
    font-size: .72rem;
    letter-spacing: .06em;
    padding-inline: 12px;
  }

  /* ヘッダー：ロゴとメニューボタンが重ならないよう調整 */
  .header-inner { gap: 10px; }
  .header-logo {
    flex: 1 1 auto;
    min-width: 0;
    max-width: calc(100% - 54px);
  }
  .header-logo-img {
    height: 34px;
    max-width: 100%;
  }

  /* Nav */
  .site-nav {
    display: none;
    position: fixed;
    top: calc(var(--banner-h) + var(--header-h));
    inset-inline: 0;
    background: var(--navy);
    padding: 18px 0 28px;
    border-top: 1px solid rgba(255,255,255,.08);
    box-shadow: var(--shadow-lg);
    max-height: calc(100svh - var(--banner-h) - var(--header-h));
    overflow-y: auto;
    flex-direction: column;
  }
  .site-nav.open { display: flex; }
  .site-nav ul { flex-direction: column; }
  .site-nav ul li a {
    padding: 14px 24px;
    min-height: 48px;
    display: flex;
    align-items: center;
    font-size: .96rem;
    border-radius: 0;
    border-bottom: 1px solid rgba(255,255,255,.05);
  }
  .btn-nav-contact {
    margin: 16px 24px 0 !important;
    border-radius: var(--r-md) !important;
    display: flex !important;
    align-items: center;
    justify-content: center;
    min-height: 48px;
  }
  .nav-toggle { display: flex; }
  .logo-sub   { display: none; }

  /* ボタン：指で押しやすいサイズ */
  .btn {
    min-height: 44px;
    white-space: normal;
    text-align: center;
  }

  /* フォーム：文字サイズ16px以上（iOSの自動ズーム防止） */
  .contact-form input[type="text"],
  .contact-form input[type="email"],
  .contact-form input[type="tel"],
  .contact-form select,
  .contact-form textarea {
    font-size: 16px;
    min-height: 44px;
  }
  .form-check-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
  }
  .form-notice { font-size: .82rem; }

  /* 本文：小さすぎる文字を底上げ */
  .section-lead,
  .hero-desc-body {
    font-size: .9rem;
  }

  /* 画像のはみ出し防止 */
  .li-visual-banner-frame,
  .db-frame,
  .sulfation-img-wrap,
  .li-visual-banner-img,
  .db-photo,
  .sulfation-img {
    max-width: 100%;
  }

  /* Hero */
  .hero-title { font-size: 1.85rem; line-height: 1.32; }
  .hero-cta-group { flex-direction: column; }
  .hero-cta-group .btn { width: 100%; justify-content: center; }
  .hero-stats { flex-wrap: wrap; gap: 10px; padding-top: 14px; width: 100%; }
  .hero-stat { margin-right: 0; padding-right: 0; }
  .hero-stat-divider { display: none; }

  /* Grids */
  .issue-cards    { grid-template-columns: 1fr; }
  .merit-grid     { grid-template-columns: 1fr; }
  .mechanism-steps{ grid-template-columns: 1fr; }
  .testdata-grid  { grid-template-columns: 1fr; }
  .rd-grid        { grid-template-columns: 1fr; }
  .superk-types-grid { grid-template-columns: 1fr 1fr; }

  /* Flow */
  .proposal-flow {
    flex-direction: column;
    min-width: unset;
  }
  .flow-item {
    border-right: 1px solid rgba(255,255,255,.1);
    border-bottom: none;
    border-radius: 0;
    text-align: left;
    padding: 20px 18px;
  }
  .flow-item:first-child { border-radius: var(--r-lg) var(--r-lg) 0 0; }
  .flow-item:last-child  {
    border-radius: 0 0 var(--r-lg) var(--r-lg);
    border-bottom: 1px solid rgba(45,179,96,.45);
    border-right: 1px solid rgba(45,179,96,.45);
  }
  .flow-item:not(:last-child)::after {
    right: unset;
    bottom: -14px;
    left: 50%;
    transform: translateX(-50%);
    border-left: 14px solid transparent;
    border-right: 14px solid transparent;
    border-top: 14px solid rgba(255,255,255,.1);
    border-bottom: none;
    z-index: 2;
  }

  /* Company table */
  .company-table { display: block; overflow-x: auto; }
  .company-table th { white-space: normal; width: 36%; }

  /* Footer */
  .footer-nav { flex-direction: column; gap: 22px; }
  .page-top-btn { bottom: 18px; right: 18px; }

  /* 横スクロール防止 */
  main { overflow-x: clip; }
}


/* ============================================================
   99. 仮画像プレースホルダー
   画像未配置時にレイアウトを維持するためのスタイル。
   assets/images/ に実画像を配置すると <img> が表示され、
   ::after の仮テキストは自動的に隠れます（onerrorで切替）。
   ============================================================ */

/* ── 共通ラッパー ── */
.img-placeholder-wrap {
  position: relative;
  overflow: hidden;
  background: #E8EDF5;
  border: 2px dashed #B8C3D0;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 160px;
}

/* ── 仮テキストラベル（img が読み込まれると img が前面に来て隠れる） ── */
.img-placeholder-wrap::after {
  content: attr(data-placeholder);
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Noto Sans JP', sans-serif;
  font-size: .78rem;
  font-weight: 500;
  color: #637282;
  letter-spacing: .06em;
  text-align: center;
  padding: 12px;
  line-height: 1.7;
  pointer-events: none;
  z-index: 0;
}

/* ── img が存在する（broken でない）ときは ::after を隠す ── */
.img-placeholder-wrap img {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ── エラー状態（画像ファイルが見つからないとき） ── */
.img-placeholder-wrap img.img-error {
  opacity: 0;       /* 壊れたアイコンを非表示 */
  position: absolute;
}

/* ── サイズ別バリエーション ── */
.img-placeholder-wrap--hero {
  width: 100%;
  min-height: 480px;
}
.img-placeholder-wrap--banner {
  width: 100%;
  aspect-ratio: 16 / 6;
}
.img-placeholder-wrap--square {
  aspect-ratio: 1 / 1;
}
.img-placeholder-wrap--portrait {
  aspect-ratio: 3 / 4;
  max-width: 300px;
  margin: 0 auto;
}
.img-placeholder-wrap--diagram {
  width: 100%;
  aspect-ratio: 4 / 3;
}
.img-placeholder-wrap--cinematic {
  width: 100%;
  min-height: 320px;
  aspect-ratio: 21 / 9;
}
.img-placeholder-wrap--gallery {
  width: 100%;
  aspect-ratio: 4 / 3;
}

/* PC only */
@media (min-width: 900px) {
  .br-pc { display: inline; }
}

/* ==============================
   23.9 製品パッケージ シネマティックビジュアル（index.html用）  .skp-*
   ============================== */

.skp-visual {
  margin: 0 0 52px;
  padding: 0;
}

.skp-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 6;
  overflow: hidden;
  border-radius: 14px;
  box-shadow:
    0 2px 4px  rgba(0,0,0,.06),
    0 10px 32px rgba(0,0,0,.11),
    0 28px 64px rgba(10,20,40,.13);
}

.skp-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center center;
  display: block;
  filter: brightness(.90) contrast(1.04) saturate(.88);
  transition: transform 1s cubic-bezier(.25,.46,.45,.94),
              filter     1s cubic-bezier(.25,.46,.45,.94);
}
.skp-frame:hover .skp-photo {
  transform: scale(1.03);
  filter: brightness(.84) contrast(1.06) saturate(.90);
}

.skp-grad-top {
  position: absolute;
  inset: 0 0 auto 0;
  height: 30%;
  background: linear-gradient(to bottom, rgba(6,14,28,.28) 0%, transparent 100%);
  pointer-events: none;
}
.skp-grad-bottom {
  position: absolute;
  inset: auto 0 0 0;
  height: 50%;
  background: linear-gradient(to top, rgba(6,14,28,.52) 0%, transparent 100%);
  pointer-events: none;
}
.skp-grad-right {
  position: absolute;
  inset: 0 0 0 auto;
  width: 52%;
  background: linear-gradient(
    to left,
    rgba(6,14,28,.80) 0%,
    rgba(6,14,28,.50) 45%,
    transparent 100%
  );
  pointer-events: none;
}

/* ゴールドアクセントライン（右端） */
.skp-accent-line {
  position: absolute;
  top: 15%;
  bottom: 15%;
  right: 0;
  width: 3px;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    rgba(192,160,55,.88) 30%,
    rgba(210,178,72,.88) 70%,
    transparent 100%
  );
  border-radius: 2px 0 0 2px;
}

/* テキストオーバーレイ（右寄せ） */
.skp-overlay {
  position: absolute;
  top: 50%;
  right: 40px;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
  max-width: 420px;
}

.skp-ov-eyebrow {
  margin: 0;
  font-size: .64rem;
  font-weight: 500;
  letter-spacing: .26em;
  color: rgba(192,162,65,.88);
  text-transform: uppercase;
}

.skp-ov-heading {
  margin: 0;
  font-family: var(--font-serif, 'Noto Serif JP', serif);
  font-size: 1.48rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: .04em;
  line-height: 1.3;
  text-align: right;
  text-shadow: 0 2px 12px rgba(0,0,0,.55);
}

.skp-ov-sub {
  margin: 0;
  font-size: .76rem;
  color: rgba(215,225,238,.72);
  letter-spacing: .08em;
  text-align: right;
}

.skp-ov-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 7px;
  margin-top: 4px;
}
.skp-ov-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 12px;
  font-size: .67rem;
  font-weight: 500;
  letter-spacing: .07em;
  color: rgba(192,162,65,.90);
  border: 1px solid rgba(175,148,50,.38);
  border-radius: 999px;
  background: rgba(6,14,28,.30);
  backdrop-filter: blur(4px);
}
.skp-ov-badge i { font-size: .64rem; opacity: .8; }

/* キャプション */
.skp-caption {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 11px 0 0;
  font-size: .72rem;
  color: var(--gray-500, #8a9096);
  letter-spacing: .04em;
  line-height: 1.65;
}
.skp-caption i { font-size: .68rem; opacity: .55; flex-shrink: 0; }

/* ── レスポンシブ ── */
@media (max-width: 960px) {
  .skp-frame      { aspect-ratio: 16 / 7; }
  .skp-ov-heading { font-size: 1.2rem; }
  .skp-overlay    { right: 28px; max-width: 340px; }
}
@media (max-width: 640px) {
  .skp-frame      { aspect-ratio: 4 / 3; border-radius: 10px; }
  .skp-grad-right { display: none; }
  .skp-grad-bottom {
    height: 68%;
    background: linear-gradient(to top, rgba(6,14,28,.82) 0%, rgba(6,14,28,.38) 55%, transparent 100%);
  }
  .skp-overlay {
    top: auto;
    bottom: 20px;
    right: 50%;
    transform: translateX(50%);
    align-items: center;
    text-align: center;
    max-width: 90%;
    gap: 6px;
  }
  .skp-ov-heading { font-size: 1rem; text-align: center; }
  .skp-ov-sub     { text-align: center; }
  .skp-ov-badges  { justify-content: center; }
  .skp-accent-line{ display: none; }
}
@media (max-width: 400px) {
  .skp-frame      { aspect-ratio: 1 / 1; }
  .skp-ov-heading { font-size: .92rem; }
}

/* ==============================
   24. superk-gateway（製品紹介誘導ブロック）
   ============================== */
.superk-gateway {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: clamp(36px, 5vw, 64px);
  align-items: center;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-xl);
  padding: clamp(32px, 5vw, 56px);
  box-shadow: 0 2px 16px rgba(12,35,64,.07);
}

.superk-gateway-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.superk-gateway-img-wrap {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-xl);
  padding: 24px;
  width: 100%;
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(12,35,64,.09);
}

.superk-gateway-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.superk-gateway-img-caption {
  font-size: .75rem;
  color: var(--text-muted);
  text-align: center;
  letter-spacing: .04em;
}

.superk-gateway-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--navy-light);
  margin-bottom: 14px;
}
.superk-gateway-eyebrow i { color: var(--green); }

.superk-gateway-title {
  font-family: var(--font-serif);
  font-size: clamp(1.15rem, 2.2vw, 1.55rem);
  font-weight: 700;
  color: var(--navy);
  line-height: 1.4;
  margin-bottom: 18px;
  letter-spacing: -.01em;
}
.superk-gateway-title strong {
  color: var(--navy);
  display: block;
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  margin-top: 4px;
}

.superk-gateway-text {
  font-size: .93rem;
  color: var(--text-mid);
  line-height: 2;
  margin-bottom: 22px;
}

.superk-gateway-points {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.superk-gateway-points li {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  font-size: .88rem;
  color: var(--text-mid);
  line-height: 1.65;
}

.superk-gateway-points li i {
  color: var(--green);
  font-size: .88rem;
  margin-top: 2px;
  flex-shrink: 0;
}

.superk-gateway-btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  background: var(--navy);
  color: var(--white);
  font-size: .88rem;
  font-weight: 700;
  letter-spacing: .04em;
  padding: 13px 28px;
  border-radius: 999px;
  box-shadow: 0 3px 14px rgba(12,35,64,.22);
  transition: background .22s, transform .18s, box-shadow .22s;
}
.superk-gateway-btn:hover {
  background: var(--green);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(26,122,66,.32);
}
.superk-gateway-btn i { font-size: .82rem; }

@media (max-width: 860px) {
  .superk-gateway {
    grid-template-columns: 1fr;
    max-width: 520px;
    margin-left: auto;
    margin-right: auto;
  }
  .superk-gateway-visual { max-width: 220px; margin: 0 auto; }
}
@media (max-width: 640px) {
  .superk-gateway { padding: 28px 22px; }
}

/* ==============================
   25. SECTION: 文献・表彰・発表実績（誘導ブロック）
   achieve-summary-* / achieve-gateway-*
   ============================== */

/* サマリーカードグリッド */
.achieve-summary-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}

.achieve-summary-card {
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.1);
  border-top: 3px solid var(--gold, #B8860B);
  border-radius: var(--r-xl);
  padding: 28px 22px 26px;
  text-align: center;
  transition: background .25s, box-shadow .25s, transform .25s;
}
.achieve-summary-card:hover {
  background: rgba(255,255,255,.08);
  box-shadow: 0 8px 28px rgba(0,0,0,.25);
  transform: translateY(-4px);
}

.achieve-summary-icon {
  width: 52px;
  height: 52px;
  background: rgba(184,134,11,.18);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #F2C44A;
  font-size: 1.2rem;
  margin: 0 auto 16px;
}

.achieve-summary-num {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  color: #F2C44A;
  line-height: 1;
  letter-spacing: -.02em;
  margin-bottom: 8px;
}
.achieve-summary-num sup {
  font-size: .52em;
  vertical-align: super;
  line-height: 0;
}

.achieve-summary-label {
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .06em;
  color: rgba(255,255,255,.72);
  margin-bottom: 10px;
}

.achieve-summary-desc {
  font-size: .76rem;
  color: rgba(255,255,255,.38);
  line-height: 1.65;
}

/* ゲートウェイ（誘導エリア） */
.achieve-gateway {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  text-align: center;
  padding: clamp(32px, 5vw, 48px) clamp(24px, 5vw, 48px);
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--r-xl);
}

.achieve-gateway-text {
  font-size: clamp(.9rem, 1.6vw, 1.05rem);
  color: rgba(255,255,255,.62);
  line-height: 2;
  font-weight: 300;
}

.achieve-gateway-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: #B8860B;
  color: var(--white);
  font-size: .9rem;
  font-weight: 700;
  letter-spacing: .05em;
  padding: 14px 38px;
  border-radius: 999px;
  box-shadow: 0 4px 20px rgba(184,134,11,.38);
  transition: background .24s, transform .2s, box-shadow .24s;
  text-decoration: none;
}
.achieve-gateway-btn:hover {
  background: #C9940D;
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(184,134,11,.5);
}
.achieve-gateway-btn i { font-size: .86rem; }

/* レスポンシブ */
@media (max-width: 960px) {
  .achieve-summary-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .achieve-summary-grid { grid-template-columns: 1fr 1fr; gap: 14px; }
  .achieve-summary-card { padding: 20px 16px; }
  .achieve-gateway { padding: 28px 20px; }
}