/* ==============================================================
   superk-product.css
   鉛電池活性化剤 ITEアクティベータースーパーK® 製品紹介ページ
   日本電池再生株式会社

   デザイン方針：
   - ベースカラー：白・紺・グレー
   - アクセント：落ち着いた緑
   - 雰囲気：科学的・誠実・上質・わかりやすい
   - 大学・研究機関・技術系企業が監修したような落ち着きと信頼感
   ============================================================== */

/* ==============================
   1. CSS Custom Properties
   ============================== */
:root {
  /* ── Core Colors ── */
  --navy:       #0C2340;   /* ダークネイビー（主色） */
  --navy-mid:   #163660;   /* ミッドネイビー */
  --navy-light: #1C4880;   /* ライトネイビー */
  --navy-deep:  #061624;   /* ディープネイビー（最暗） */
  --navy-pale:  #E8EDF5;   /* 極淡ネイビー */

  --white:      #FFFFFF;
  --gray-25:    #FAFBFC;   /* ほぼ白 */
  --gray-50:    #F4F6F9;   /* 背景ライト */
  --gray-100:   #EAEEF3;
  --gray-200:   #D8DFE8;
  --gray-300:   #B8C3D0;
  --gray-400:   #8C9BAC;
  --gray-500:   #637282;
  --gray-600:   #485664;
  --gray-700:   #323D4A;
  --gray-900:   #151C26;

  --green:      #1B7A40;   /* ベースグリーン */
  --green-mid:  #218F4A;   /* ミッドグリーン */
  --green-light:#27AA57;   /* ライトグリーン */
  --green-pale: #E2F2EA;   /* 極淡グリーン */

  /* ── Text ── */
  --text:       #1C2733;
  --text-mid:   #3D4F62;
  --text-light: #596C7F;
  --text-muted: #8A98A8;

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

  /* ── Layout ── */
  --container:  1100px;
  --header-h:   70px;

  /* ── Radii ── */
  --r-sm:  4px;
  --r-md:  8px;
  --r-lg:  12px;
  --r-xl:  18px;
  --r-2xl: 26px;

  /* ── Shadows ── */
  --sh-xs:  0 1px 3px  rgba(12,35,64,.06);
  --sh-sm:  0 2px 8px  rgba(12,35,64,.08);
  --sh-md:  0 4px 18px rgba(12,35,64,.11);
  --sh-lg:  0 8px 32px rgba(12,35,64,.14);
  --sh-xl:  0 16px 48px rgba(12,35,64,.17);

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


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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; height: auto; display: block; }
a   { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }

sup {
  font-size: .56em;
  vertical-align: super;
  line-height: 0;
}

.sp-br-pc { display: block; }


/* ==============================
   3. Layout Utilities
   ============================== */
.sp-container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 52px);
}

.sp-section {
  padding: clamp(68px, 9vw, 112px) 0;
}

.sp-section--light      { background: var(--gray-50); }
.sp-section--white      { background: var(--white); }

.sp-section--navy {
  background: linear-gradient(
    148deg,
    var(--navy-deep) 0%,
    var(--navy)      55%,
    #12325A          100%
  );
}

.sp-section--conclusion {
  background: linear-gradient(
    148deg,
    var(--navy-deep) 0%,
    #0C2D4E          50%,
    #123050          100%
  );
}


/* ==============================
   4. Section Header (汎用)
   ============================== */
.sp-sec-hd {
  text-align: center;
  margin-bottom: clamp(40px, 6vw, 60px);
}

.sp-sec-hd--left {
  text-align: left;
  margin-bottom: 32px;
}

/* ライト背景用 */
.sp-sec-hd--light .sp-sec-eyebrow { color: rgba(255,255,255,.4); }
.sp-sec-hd--light .sp-sec-title   { color: var(--white); }
.sp-sec-hd--light .sp-sec-rule    { background: rgba(255,255,255,.12); }
.sp-sec-hd--light .sp-sec-rule::before { background: var(--green-light); }

.sp-sec-eyebrow {
  display: block;
  font-size: .66rem;
  font-weight: 700;
  letter-spacing: .22em;
  color: var(--navy-light);
  margin-bottom: 12px;
}

.sp-sec-eyebrow--light { color: rgba(255,255,255,.4); }

.sp-sec-title {
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 2.7vw, 2rem);
  font-weight: 700;
  color: var(--navy);
  line-height: 1.4;
  letter-spacing: -.02em;
  margin-bottom: 8px;
}

.sp-sec-title--light { color: var(--white); }

.sp-sec-note {
  font-size: .75rem;
  color: var(--text-muted);
  margin-bottom: 0;
  margin-top: 6px;
}

/* デコレーティブルール */
.sp-sec-rule {
  width: 72px;
  height: 2px;
  background: var(--gray-200);
  border-radius: 2px;
  margin: 16px auto 0;
  position: relative;
  overflow: visible;
}
.sp-sec-rule--left { margin-left: 0; }
.sp-sec-rule--light {
  background: rgba(255,255,255,.1);
}

.sp-sec-rule::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 28px;
  height: 100%;
  background: var(--navy);
  border-radius: 2px;
}

.sp-sec-rule--light::before { background: var(--green-light); }


/* ==============================
   5. Header
   ============================== */
.sp-header {
  position: sticky;
  top: 0;
  z-index: 500;
  height: var(--header-h);
  background: rgba(6, 22, 36, .97);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255,255,255,.07);
}

.sp-header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 52px);
  height: 100%;
  display: flex;
  align-items: center;
  gap: 16px;
}

/* ロゴ */
.sp-header-logo {
  display: flex;
  align-items: center;
  gap: 11px;
  flex-shrink: 0;
  text-decoration: none;
}

.sp-header-logo-img {
  height: 32px;
  width: auto;
  object-fit: contain;
  filter: brightness(1.08);
}

.sp-header-company {
  font-size: .78rem;
  font-weight: 600;
  color: rgba(255,255,255,.72);
  letter-spacing: .04em;
  white-space: nowrap;
}

/* ページ内ナビ */
.sp-header-nav {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0 auto;
}

.sp-nav-link {
  font-size: .74rem;
  font-weight: 500;
  letter-spacing: .04em;
  color: rgba(255,255,255,.5);
  padding: 6px 12px;
  border-radius: var(--r-md);
  transition: color .2s, background .2s;
  white-space: nowrap;
}
.sp-nav-link:hover {
  color: var(--white);
  background: rgba(255,255,255,.07);
}

/* 戻るリンク */
.sp-header-back {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: .74rem;
  color: rgba(255,255,255,.42);
  letter-spacing: .04em;
  white-space: nowrap;
  flex-shrink: 0;
  transition: color .2s;
  text-decoration: none;
}
.sp-header-back:hover { color: rgba(255,255,255,.78); }
.sp-header-back i { font-size: .64rem; }


/* ==============================
   5.9 製品パッケージ シネマティックビジュアル  .skp-*
   ============================== */

/* セクション外枠 */
.skp-visual-section {
  background: var(--gray-50);
  padding: 0 0 0;
}

/* コンテナ */
.skp-visual-container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px 40px;
}

/* フレーム本体 */
.skp-visual-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 6;
  overflow: hidden;
  border-radius: var(--r-xl);
  box-shadow:
    0 2px 4px  rgba(0,0,0,.06),
    0 10px 32px rgba(0,0,0,.12),
    0 28px 64px rgba(10,20,40,.14);
}

/* 写真 */
.skp-visual-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center center;
  display: block;
  /* 白・紺・グレー基調に合わせ若干脱彩色 */
  filter: brightness(.9) contrast(1.04) saturate(.88);
  transition: transform 1s cubic-bezier(.25,.46,.45,.94),
              filter     1s cubic-bezier(.25,.46,.45,.94);
}
.skp-visual-frame:hover .skp-visual-photo {
  transform: scale(1.03);
  filter: brightness(.85) contrast(1.06) saturate(.90);
}

/* 上部グラデーション */
.skp-grad-top {
  position: absolute;
  inset: 0 0 auto 0;
  height: 30%;
  background: linear-gradient(to bottom, rgba(6,14,28,.30) 0%, transparent 100%);
  pointer-events: none;
}

/* 下部グラデーション */
.skp-grad-bottom {
  position: absolute;
  inset: auto 0 0 0;
  height: 50%;
  background: linear-gradient(to top, rgba(6,14,28,.55) 0%, transparent 100%);
  pointer-events: none;
}

/* 右側グラデーション（テキストエリア） */
.skp-grad-right {
  position: absolute;
  inset: 0 0 0 auto;
  width: 52%;
  background: linear-gradient(
    to left,
    rgba(6,14,28,.78) 0%,
    rgba(6,14,28,.52) 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(195,162,58,.85) 30%,
    rgba(210,178,72,.85) 70%,
    transparent 100%
  );
  border-radius: 2px 0 0 2px;
}

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

/* PRODUCT PACKAGE */
.skp-overlay-eyebrow {
  margin: 0;
  font-family: var(--font-sans);
  font-size: .64rem;
  font-weight: 500;
  letter-spacing: .26em;
  color: rgba(195,165,70,.85);
  text-transform: uppercase;
}

/* 製品名 */
.skp-overlay-heading {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.55rem;
  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);
}

/* サブテキスト */
.skp-overlay-sub {
  margin: 0;
  font-family: var(--font-sans);
  font-size: .78rem;
  font-weight: 400;
  color: rgba(220,228,240,.72);
  letter-spacing: .08em;
  text-align: right;
}

/* バッジ群 */
.skp-overlay-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 4px;
}

.skp-overlay-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 13px;
  font-size: .68rem;
  font-weight: 500;
  letter-spacing: .07em;
  color: rgba(195,165,70,.90);
  border: 1px solid rgba(180,150,55,.38);
  border-radius: 999px;
  background: rgba(6,14,28,.32);
  backdrop-filter: blur(4px);
}
.skp-overlay-badge i { font-size: .65rem; opacity: .8; }

/* 下部キャプション */
.skp-visual-caption {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 12px 0 0;
  font-size: .72rem;
  color: var(--text-muted);
  letter-spacing: .04em;
  line-height: 1.6;
}
.skp-visual-caption i { font-size: .68rem; opacity: .55; flex-shrink: 0; }

/* ── レスポンシブ ── */
@media (max-width: 960px) {
  .skp-visual-frame    { aspect-ratio: 16 / 7; }
  .skp-overlay-heading { font-size: 1.25rem; }
  .skp-overlay-text    { right: 28px; max-width: 340px; }
}

@media (max-width: 640px) {
  .skp-visual-container { padding: 0 16px 32px; }
  .skp-visual-frame     { aspect-ratio: 4 / 3; border-radius: var(--r-lg); }
  /* スマホでは下部中央レイアウトに切り替え */
  .skp-grad-right       { display: none; }
  .skp-grad-bottom {
    height: 70%;
    background: linear-gradient(to top, rgba(6,14,28,.80) 0%, rgba(6,14,28,.40) 55%, transparent 100%);
  }
  .skp-overlay-text {
    top: auto;
    bottom: 20px;
    right: 50%;
    transform: translateX(50%);
    align-items: center;
    text-align: center;
    max-width: 90%;
  }
  .skp-overlay-heading { font-size: 1.05rem; text-align: center; }
  .skp-overlay-sub     { text-align: center; }
  .skp-overlay-badges  { justify-content: center; }
  .skp-accent-line     { display: none; }
}

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

/* ==============================
   6. Hero Section
   ============================== */
.sp-hero {
  background: linear-gradient(
    148deg,
    var(--navy-deep) 0%,
    #0D2745          48%,
    #12345C          100%
  );
  padding: clamp(60px, 8.5vw, 106px) 0 clamp(72px, 10vw, 120px);
  position: relative;
  overflow: hidden;
}

/* 背景テクスチャ */
.sp-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 55% 60% at 88% 18%, rgba(27,122,64,.1),  transparent),
    radial-gradient(ellipse 35% 45% at 8%  78%, rgba(255,255,255,.04), transparent);
}

.sp-hero-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 52px);
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: clamp(44px, 7vw, 88px);
  align-items: center;
  position: relative;
}

/* ── エイブロー ── */
.sp-hero-eyebrow { margin-bottom: 20px; }

.sp-eyebrow-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: .64rem;
  font-weight: 700;
  letter-spacing: .2em;
  color: rgba(255,255,255,.55);
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: var(--r-sm);
  padding: 6px 14px;
}

.sp-eyebrow-badge-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--green-light);
  border-radius: 50%;
  flex-shrink: 0;
  animation: sp-dot-blink 2.2s ease-in-out infinite;
}

@keyframes sp-dot-blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: .3; }
}

/* ── タイトル ── */
.sp-hero-title {
  margin-bottom: 20px;
  line-height: 1.3;
}

.sp-hero-title-type {
  display: block;
  font-family: var(--font-sans);
  font-size: clamp(.88rem, 1.35vw, 1rem);
  font-weight: 400;
  color: rgba(255,255,255,.48);
  letter-spacing: .1em;
  margin-bottom: 8px;
}

.sp-hero-product-name {
  display: block;
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3.8vw, 2.8rem);
  font-weight: 700;
  color: #C6DECE;           /* 淡いグリーンホワイト */
  letter-spacing: -.015em;
  line-height: 1.22;
  font-style: normal;
}

/* ── サブタイトル ── */
.sp-hero-subtitle {
  font-size: clamp(.9rem, 1.5vw, 1.05rem);
  color: rgba(255,255,255,.62);
  line-height: 1.85;
  margin-bottom: 30px;
  letter-spacing: .01em;
}

/* ── リード文ボックス ── */
.sp-hero-lead {
  margin-bottom: 30px;
  padding: 22px 26px;
  background: rgba(255,255,255,.05);
  border-left: 3px solid rgba(39,170,87,.55);
  border-radius: 0 var(--r-lg) var(--r-lg) 0;
}
.sp-hero-lead p {
  font-size: .91rem;
  color: rgba(255,255,255,.74);
  line-height: 2.05;
  margin-bottom: 12px;
}
.sp-hero-lead p:last-child { margin-bottom: 0; }
.sp-hero-lead strong {
  color: #B4D4BE;
  font-weight: 700;
}

/* ── バッジリスト ── */
.sp-hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}
.sp-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .05em;
  color: rgba(255,255,255,.68);
  background: rgba(255,255,255,.065);
  border: 1px solid rgba(255,255,255,.11);
  border-radius: 999px;
  padding: 6px 15px;
  transition: background .2s, border-color .2s;
}
.sp-hero-badge:hover {
  background: rgba(255,255,255,.09);
  border-color: rgba(255,255,255,.16);
}
.sp-hero-badge i { color: var(--green-light); font-size: .76rem; }

/* ── 商品写真 figure ── */
.sp-hero-fig {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.sp-hero-img-frame {
  background: var(--white);
  border-radius: var(--r-2xl);
  padding: 32px;
  width: 100%;
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  box-shadow:
    0 0 0 1px rgba(255,255,255,.09),
    0 10px 40px rgba(0,0,0,.32),
    0 3px 10px rgba(0,0,0,.2);
  position: relative;
}

/* 微細なグローリング */
.sp-hero-img-frame::after {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  border: 2px solid rgba(39,170,87,.15);
  pointer-events: none;
}

.sp-hero-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  filter: saturate(1.04) brightness(1.01);
}

.sp-hero-figcaption { text-align: center; }

.sp-figcap-name {
  display: block;
  font-family: var(--font-serif);
  font-size: .87rem;
  font-weight: 600;
  color: rgba(255,255,255,.82);
  line-height: 1.5;
  margin-bottom: 4px;
  letter-spacing: .01em;
}

.sp-figcap-type {
  display: block;
  font-size: .68rem;
  color: rgba(255,255,255,.32);
  letter-spacing: .07em;
}


/* ==============================
   7. Feature Grid (Section 2)
   ============================== */
.sp-feat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.sp-feat-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-xl);
  padding: 28px 22px 26px;
  box-shadow: var(--sh-xs);
  position: relative;
  overflow: hidden;
  transition: transform .26s var(--ease), box-shadow .26s var(--ease);
}

/* 上部カラーライン */
.sp-feat-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gray-200);
  transition: background .26s;
}
.sp-feat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--sh-lg);
}
.sp-feat-card:hover::before { background: var(--navy); }

/* アイコン */
.sp-feat-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  margin-bottom: 18px;
  flex-shrink: 0;
}
.sp-feat-icon--1 { background: rgba(12,35,64,.07);  color: var(--navy); }
.sp-feat-icon--2 { background: rgba(22,54,96,.07);  color: var(--navy-mid); }
.sp-feat-icon--3 { background: rgba(27,122,64,.09); color: var(--green); }
.sp-feat-icon--4 { background: rgba(27,122,64,.09); color: var(--green); }

.sp-feat-title {
  font-size: .93rem;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.5;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--gray-100);
}

.sp-feat-text {
  font-size: .84rem;
  color: var(--text-light);
  line-height: 1.95;
  margin: 0;
}


/* ==============================
   8. About / Spec (Section 3)
   ============================== */
.sp-about-grid {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: clamp(36px, 5.5vw, 68px);
  align-items: start;
}

.sp-about-text p {
  font-size: .95rem;
  color: var(--text-mid);
  line-height: 2.1;
  margin-bottom: 20px;
}
.sp-about-text p:last-child { margin-bottom: 0; }
.sp-about-text strong { color: var(--navy); font-weight: 700; }

/* 製品仕様カード */
.sp-spec-card {
  background: var(--gray-25);
  border: 1px solid var(--gray-200);
  border-top: 3px solid var(--navy);
  border-radius: var(--r-xl);
  padding: 26px 22px;
  box-shadow: var(--sh-md);
  position: sticky;
  top: calc(var(--header-h) + 20px);
}

.sp-spec-eyebrow {
  font-size: .64rem;
  font-weight: 700;
  letter-spacing: .17em;
  color: var(--navy-light);
  margin-bottom: 7px;
}

.sp-spec-title {
  font-family: var(--font-serif);
  font-size: .96rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 18px;
  padding-bottom: 13px;
  border-bottom: 1px solid var(--gray-200);
  line-height: 1.4;
}

.sp-spec-list {
  display: flex;
  flex-direction: column;
}

.sp-spec-row {
  display: grid;
  grid-template-columns: 5em 1fr;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--gray-100);
  font-size: .82rem;
  line-height: 1.7;
}
.sp-spec-row:last-child { border-bottom: none; }
.sp-spec-row dt { font-weight: 700; color: var(--navy); white-space: nowrap; padding-top: 1px; }
.sp-spec-row dd { color: var(--text-light); }

/* 正式名称行：長い製品名を1行に収める */
.sp-spec-dd--product-name {
  font-size: .72rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  letter-spacing: -.03em;
}


/* ==============================
   9. R&D Section (Section 4 — navy bg)
   ============================== */
.sp-rd-lead {
  max-width: 760px;
  margin: 0 auto 44px;
  text-align: center;
}
.sp-rd-lead p {
  font-size: .95rem;
  color: rgba(255,255,255,.68);
  line-height: 2.1;
}
.sp-rd-lead strong { color: rgba(255,255,255,.92); font-weight: 700; }

.sp-rd-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.sp-rd-card {
  background: rgba(255,255,255,.055);
  border: 1px solid rgba(255,255,255,.09);
  border-top: 3px solid var(--green-light);
  border-radius: var(--r-xl);
  padding: 30px 24px;
  transition: background .24s;
}
.sp-rd-card:hover { background: rgba(255,255,255,.085); }

.sp-rd-icon-wrap {
  font-size: 1.5rem;
  color: var(--green-light);
  margin-bottom: 16px;
  opacity: .8;
}

.sp-rd-card-title {
  font-family: var(--font-serif);
  font-size: .96rem;
  font-weight: 600;
  color: var(--white);
  line-height: 1.5;
  margin-bottom: 13px;
}

.sp-rd-card-text {
  font-size: .85rem;
  color: rgba(255,255,255,.63);
  line-height: 2;
  margin: 0;
}


/* ==============================
   10. Team (Section 5)
   ============================== */

/* ── リーダーカード ── */
.sp-leader-wrap {
  display: flex;
  justify-content: center;
  margin-bottom: 40px;
}

.sp-leader-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-2xl);
  max-width: 740px;
  width: 100%;
  box-shadow: var(--sh-xl);
  overflow: hidden;
  position: relative;
}

/* グラデーショントップバー */
.sp-leader-accent {
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--navy)     0%,
    var(--navy-mid) 55%,
    var(--green)    100%
  );
}

.sp-leader-inner {
  display: flex;
  gap: clamp(22px, 4vw, 44px);
  padding: clamp(26px, 4vw, 40px);
  align-items: flex-start;
}

.sp-leader-avatar {
  width: 78px;
  height: 78px;
  border-radius: 50%;
  background: var(--navy-pale);
  border: 2.5px solid var(--navy);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  color: var(--navy);
  flex-shrink: 0;
  opacity: .72;
}

.sp-leader-body { flex: 1; }

.sp-leader-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: .63rem;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--white);
  background: var(--navy);
  border-radius: 999px;
  padding: 4px 13px;
  margin-bottom: 14px;
}
.sp-leader-tag i { color: var(--green-light); font-size: .68rem; }

.sp-leader-name {
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 2.5vw, 1.9rem);
  font-weight: 700;
  color: var(--navy);
  letter-spacing: .04em;
  line-height: 1.25;
  margin-bottom: 8px;
}

.sp-leader-affil {
  font-size: .84rem;
  color: var(--text-light);
  line-height: 1.65;
  margin-bottom: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--gray-100);
}

.sp-leader-desc {
  font-size: .87rem;
  color: var(--text-mid);
  line-height: 2;
  margin: 0;
}
.sp-leader-desc sup { color: var(--navy-light); }

/* ── メンバーグリッド ── */
.sp-team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.sp-team-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-lg);
  padding: 18px 15px;
  text-align: center;
  box-shadow: var(--sh-xs);
  transition: transform .22s var(--ease), box-shadow .22s var(--ease);
  position: relative;
}
.sp-team-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--sh-md);
}

.sp-team-card--intl {
  border-top: 3px solid var(--green);
}

.sp-team-intl-tag {
  position: absolute;
  top: -1px;
  right: 10px;
  font-size: .58rem;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--white);
  background: var(--green);
  border-radius: 0 0 4px 4px;
  padding: 3px 9px;
}

.sp-team-no {
  font-size: .6rem;
  font-weight: 700;
  letter-spacing: .07em;
  color: var(--gray-300);
  margin-bottom: 9px;
}

.sp-team-name {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--navy);
  letter-spacing: .04em;
  line-height: 1.4;
  margin-bottom: 7px;
}

.sp-team-affil {
  font-size: .75rem;
  color: var(--text-light);
  line-height: 1.65;
  margin: 0;
}


/* ==============================
   11. Conclusion (Section 6)
   ============================== */
.sp-conclusion-block {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

/* 装飾ライン＋アイコン */
.sp-conclusion-deco {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 26px;
}

.sp-conclusion-line {
  flex: 1;
  max-width: 100px;
  height: 1px;
  background: linear-gradient(to right, transparent, rgba(255,255,255,.18));
}
.sp-conclusion-line:last-child {
  background: linear-gradient(to left, transparent, rgba(255,255,255,.18));
}

.sp-conclusion-icon {
  font-size: 2.2rem;
  color: var(--green-light);
  opacity: .65;
}

.sp-conclusion-heading {
  font-family: var(--font-serif);
  font-size: clamp(.82rem, 1.35vw, .97rem);
  font-weight: 500;
  letter-spacing: .2em;
  color: rgba(255,255,255,.38);
  margin-bottom: 26px;
}

.sp-conclusion-text {
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 2.4vw, 1.55rem);
  font-weight: 600;
  color: rgba(255,255,255,.9);
  line-height: 2;
  margin-bottom: 22px;
  letter-spacing: -.01em;
}
.sp-conclusion-text strong {
  color: #A6CCBA;
  font-weight: 700;
  border-bottom: 1px solid rgba(166,204,186,.3);
  padding-bottom: 2px;
}

.sp-conclusion-sub {
  font-size: .9rem;
  color: rgba(255,255,255,.5);
  line-height: 2;
  margin-bottom: 42px;
}

/* CTA ボタン */
.sp-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--green);
  color: var(--white);
  font-size: .9rem;
  font-weight: 700;
  letter-spacing: .06em;
  padding: 14px 38px;
  border-radius: 999px;
  box-shadow: 0 4px 20px rgba(27,122,64,.42);
  transition:
    background .24s var(--ease),
    transform  .2s  var(--ease),
    box-shadow .24s var(--ease);
  text-decoration: none;
}
.sp-cta-btn:hover {
  background: var(--green-mid);
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(27,122,64,.52);
}
.sp-cta-btn i { font-size: .86rem; }


/* ==============================
   12. Footer
   ============================== */
.sp-footer {
  background: var(--gray-900);
  padding: 38px 0;
  border-top: 1px solid rgba(255,255,255,.05);
}

.sp-footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 52px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  text-align: center;
}

.sp-footer-company {
  font-size: .87rem;
  font-weight: 600;
  color: rgba(255,255,255,.68);
  letter-spacing: .07em;
}

.sp-footer-nav {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
}
.sp-footer-nav a {
  font-size: .74rem;
  color: rgba(255,255,255,.36);
  letter-spacing: .04em;
  transition: color .2s;
}
.sp-footer-nav a:hover { color: rgba(255,255,255,.68); }

.sp-footer-trademark {
  font-size: .7rem;
  color: rgba(255,255,255,.28);
  letter-spacing: .03em;
}

.sp-footer-copy {
  font-size: .68rem;
  color: rgba(255,255,255,.2);
}


/* ==============================
   13. Feature Points（特徴 3ポイント）
   ============================== */
.sp-feat-points {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-top: 36px;
}

.sp-feat-point {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-xl);
  padding: 28px 24px;
  box-shadow: var(--sh-xs);
  position: relative;
  overflow: hidden;
}

.sp-feat-point::after {
  content: "";
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--navy), var(--green));
}

.sp-feat-point-num {
  font-size: .65rem;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--navy-light);
  margin-bottom: 10px;
}

.sp-feat-point-title {
  font-family: var(--font-serif);
  font-size: .97rem;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.5;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--gray-100);
}

.sp-feat-point-text {
  font-size: .85rem;
  color: var(--text-light);
  line-height: 1.95;
  margin: 0;
}


/* ==============================
   14. About Highlight（引用ボックス）
   ============================== */
.sp-about-highlight {
  margin-top: 28px;
  padding: 24px 28px 22px;
  background: var(--navy-pale);
  border-left: 4px solid var(--navy);
  border-radius: 0 var(--r-lg) var(--r-lg) 0;
  position: relative;
}

.sp-about-highlight-icon {
  font-size: 1.6rem;
  color: var(--navy);
  opacity: .18;
  position: absolute;
  top: 16px;
  left: 20px;
}

.sp-about-highlight p {
  font-family: var(--font-serif);
  font-size: .91rem;
  color: var(--navy);
  line-height: 2;
  padding-left: 28px;
  margin-bottom: 10px;
}

.sp-about-highlight-source {
  font-size: .75rem !important;
  color: var(--text-muted) !important;
  font-style: italic;
  padding-left: 28px !important;
  margin-bottom: 0 !important;
}

/* 注意事項ボックス（spec card内） */
.sp-spec-note-box {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-top: 16px;
  padding: 13px 14px;
  background: var(--gray-100);
  border-radius: var(--r-md);
  font-size: .77rem;
  color: var(--text-light);
  line-height: 1.75;
}

.sp-spec-note-box i {
  color: var(--navy-light);
  font-size: .85rem;
  flex-shrink: 0;
  margin-top: 2px;
}

/* sec-lead */
.sp-sec-lead {
  font-size: .93rem;
  color: var(--text-light);
  line-height: 1.85;
  max-width: 640px;
  margin: 10px auto 0;
}


/* ==============================
   15. Mechanism（作用メカニズム）
   ============================== */
.sp-mech-flow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  margin-bottom: 52px;
  max-width: 840px;
  margin-left: auto;
  margin-right: auto;
}

.sp-mech-step {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-xl);
  padding: 26px 28px;
  width: 100%;
  box-shadow: var(--sh-xs);
  transition: box-shadow .22s;
}
.sp-mech-step:hover { box-shadow: var(--sh-md); }

.sp-mech-step--solution {
  border: 2px solid var(--green);
  background: var(--green-pale);
}
.sp-mech-step--solution .sp-mech-step-title { color: var(--green); }
.sp-mech-step--solution .sp-mech-step-num span { background: var(--green); }

.sp-mech-step-num {
  flex-shrink: 0;
}
.sp-mech-step-num span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--navy);
  color: var(--white);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .04em;
  border-radius: 50%;
}
.sp-mech-step-num--2 span { background: var(--navy-mid); }
.sp-mech-step-num--3 span { background: var(--green); }

.sp-mech-step-body { flex: 1; }

.sp-mech-step-title {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.45;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 9px;
}
.sp-mech-step-title i { font-size: .92rem; opacity: .75; }

.sp-mech-step-text {
  font-size: .88rem;
  color: var(--text-mid);
  line-height: 2;
  margin: 0;
}
.sp-mech-step-text strong { color: var(--navy); font-weight: 700; }

.sp-mech-arrow {
  color: var(--gray-300);
  font-size: 1.1rem;
  padding: 8px 0;
}

/* 比較テーブル */
.sp-compare-wrap {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-xl);
  padding: clamp(24px, 4vw, 40px);
  box-shadow: var(--sh-sm);
}

.sp-compare-heading {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 24px;
  text-align: center;
}

.sp-compare-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 20px;
  align-items: start;
  margin-bottom: 20px;
}

.sp-compare-col {
  border: 1px solid var(--gray-200);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.sp-compare-col--without { border-top: 3px solid var(--gray-400); }
.sp-compare-col--with    { border-top: 3px solid var(--green); }

.sp-compare-col-head {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 13px 18px;
  font-size: .85rem;
  font-weight: 700;
  letter-spacing: .02em;
}

.sp-compare-col--without .sp-compare-col-head {
  background: var(--gray-100);
  color: var(--gray-600);
}
.sp-compare-col--without .sp-compare-col-head i { color: var(--gray-400); }

.sp-compare-col--with .sp-compare-col-head {
  background: var(--green-pale);
  color: var(--green);
}
.sp-compare-col--with .sp-compare-col-head i { color: var(--green-light); }

.sp-compare-list {
  padding: 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sp-compare-list li {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  font-size: .85rem;
  color: var(--text-mid);
  line-height: 1.65;
}

.sp-compare-col--without .sp-compare-list li i {
  color: var(--gray-400);
  flex-shrink: 0;
  margin-top: 2px;
  font-size: .8rem;
}
.sp-compare-col--with .sp-compare-list li i {
  color: var(--green);
  flex-shrink: 0;
  margin-top: 2px;
  font-size: .8rem;
}

.sp-compare-vs {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--gray-300);
  letter-spacing: .06em;
  padding-top: 60px;
}

.sp-compare-note {
  font-size: .77rem;
  color: var(--text-muted);
  line-height: 1.75;
  padding-top: 14px;
  border-top: 1px solid var(--gray-100);
}


/* ==============================
   16. Application（適用対象）
   ============================== */
.sp-app-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 32px;
}

.sp-app-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-xl);
  padding: 26px 20px 22px;
  box-shadow: var(--sh-xs);
  transition: transform .24s var(--ease), box-shadow .24s var(--ease);
}
.sp-app-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--sh-md);
}

.sp-app-icon {
  width: 48px;
  height: 48px;
  background: var(--navy-pale);
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--navy);
  font-size: 1.15rem;
  margin-bottom: 16px;
}

.sp-app-title {
  font-size: .93rem;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.5;
  margin-bottom: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--gray-100);
}

.sp-app-text {
  font-size: .83rem;
  color: var(--text-light);
  line-height: 1.9;
  margin: 0;
}

/* 注意バナー */
.sp-app-caution {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  background: #FFF8E8;
  border: 1px solid #E8C94A;
  border-radius: var(--r-lg);
  padding: 20px 24px;
  margin-bottom: 44px;
}

.sp-app-caution-icon {
  color: #B8860B;
  font-size: 1.2rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.sp-app-caution-title {
  font-size: .9rem;
  font-weight: 700;
  color: #7A5C00;
  margin-bottom: 6px;
  line-height: 1.4;
}

.sp-app-caution-text {
  font-size: .83rem;
  color: #7A5C00;
  line-height: 1.85;
  margin: 0;
}

/* 導入の流れ */
.sp-flow-wrap {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-xl);
  padding: clamp(24px, 4vw, 40px);
}

.sp-flow-heading {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 28px;
  padding-left: 14px;
  border-left: 4px solid var(--green);
}

.sp-flow-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.sp-flow-step {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  padding: 18px 0;
  border-bottom: 1px solid var(--gray-200);
}
.sp-flow-step:last-child { border-bottom: none; padding-bottom: 0; }

.sp-flow-step-num {
  flex-shrink: 0;
  font-size: .63rem;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--white);
  background: var(--navy);
  border-radius: var(--r-sm);
  padding: 5px 10px 5px 8px;
  margin-top: 2px;
  white-space: nowrap;
}

.sp-flow-step-title {
  font-size: .94rem;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.45;
  margin-bottom: 6px;
}

.sp-flow-step-text {
  font-size: .85rem;
  color: var(--text-light);
  line-height: 1.85;
  margin: 0;
}


/* ==============================
   17. R&D Fields タグ
   ============================== */
.sp-rd-fields {
  margin-top: 40px;
  text-align: center;
}

.sp-rd-fields-label {
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .18em;
  color: rgba(255,255,255,.35);
  margin-bottom: 16px;
}

.sp-rd-fields-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

.sp-rd-fields-list li {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: .78rem;
  color: rgba(255,255,255,.65);
  background: rgba(255,255,255,.07);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 999px;
  padding: 6px 14px;
}

.sp-rd-fields-list li i {
  color: var(--green-light);
  font-size: .78rem;
}


/* ==============================
   18. Team Academic（学術的背景）
   ============================== */
.sp-team-academic {
  margin-top: 40px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--r-xl);
  padding: clamp(24px, 4vw, 36px);
  box-shadow: var(--sh-xs);
}

.sp-team-academic-title {
  font-family: var(--font-serif);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 24px;
  padding-left: 14px;
  border-left: 4px solid var(--navy);
}

.sp-team-academic-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
}

.sp-team-academic-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.sp-team-academic-item > i {
  width: 44px;
  height: 44px;
  background: var(--navy-pale);
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--navy);
  font-size: 1.05rem;
  flex-shrink: 0;
}

.sp-team-academic-item strong {
  display: block;
  font-size: .92rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 8px;
  line-height: 1.4;
}

.sp-team-academic-item p {
  font-size: .84rem;
  color: var(--text-light);
  line-height: 1.9;
  margin: 0;
}


/* ==============================
   19. Conclusion Points（まとめポイント）
   ============================== */
.sp-conclusion-points {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin-bottom: 40px;
}

.sp-conclusion-point {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: .84rem;
  color: rgba(255,255,255,.72);
  background: rgba(255,255,255,.07);
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 999px;
  padding: 8px 18px;
}

.sp-conclusion-point i {
  color: var(--green-light);
  font-size: .88rem;
}


/* ==============================
   20. Responsive — ≤960px
   ============================== */
@media (max-width: 960px) {
  /* Hero: 1カラム */
  .sp-hero-inner {
    grid-template-columns: 1fr;
    max-width: 560px;
    text-align: center;
  }
  .sp-hero-fig          { order: -1; }
  .sp-hero-img-frame    { max-width: 240px; margin: 0 auto; }
  .sp-hero-badges       { justify-content: center; }
  .sp-hero-lead         { text-align: left; }

  /* Features */
  .sp-feat-grid         { grid-template-columns: repeat(2, 1fr); }
  .sp-feat-points       { grid-template-columns: 1fr; }

  /* About */
  .sp-about-grid        { grid-template-columns: 1fr; }
  .sp-spec-card         { position: static; }

  /* Mechanism */
  .sp-compare-grid      { grid-template-columns: 1fr; gap: 12px; }
  .sp-compare-vs        { padding-top: 0; }

  /* Application */
  .sp-app-grid          { grid-template-columns: repeat(2, 1fr); }

  /* R&D */
  .sp-rd-grid           { grid-template-columns: 1fr; gap: 16px; }

  /* Team */
  .sp-team-grid         { grid-template-columns: repeat(3, 1fr); }
  .sp-leader-card       { max-width: 560px; margin: 0 auto; }
  .sp-team-academic-grid{ grid-template-columns: 1fr; }

  /* Header */
  .sp-header-nav        { display: none; }
}


/* ==============================
   21. Responsive — ≤640px
   ============================== */
@media (max-width: 640px) {
  .sp-hero-product-name  { font-size: 1.5rem; }
  .sp-hero-title-type    { font-size: .82rem; }

  .sp-feat-grid          { grid-template-columns: 1fr; gap: 14px; }

  .sp-leader-inner {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  .sp-leader-affil       { text-align: center; }

  .sp-team-grid          { grid-template-columns: repeat(2, 1fr); }
  .sp-spec-row           { grid-template-columns: 4.5em 1fr; }

  .sp-app-grid           { grid-template-columns: 1fr; }
  .sp-app-caution        { flex-direction: column; gap: 12px; }

  .sp-flow-step          { flex-direction: column; gap: 10px; }

  .sp-mech-step          { flex-direction: column; gap: 14px; }

  .sp-team-academic-item { flex-direction: column; gap: 10px; }

  .sp-header-company    { display: none; }
  .sp-header-back span  { display: none; }

  .sp-br-pc              { display: inline; }
}


/* ==============================
   22. Responsive — ≤400px
   ============================== */
@media (max-width: 400px) {
  .sp-team-grid          { grid-template-columns: 1fr; }
  .sp-conclusion-points  { flex-direction: column; align-items: center; }
}