:root {
  --bg: #fffaf6;
  --surface: #ffffff;
  --surface-soft: #fff4ec;
  --text: #25201d;
  --muted: #6c625d;
  --brand: #ff5b21;
  --brand-2: #ff9a4a;
  --brand-rgb: 255, 91, 33;
  --line: rgba(77, 57, 47, 0.12);
  --shadow: 0 24px 70px rgba(82, 47, 28, 0.12);
  --shadow-sm: 0 12px 34px rgba(82, 47, 28, 0.10);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 16px;
  --container: 1180px;
}

body.page-water {
  --bg: #f4fbff;
  --surface-soft: #eaf8ff;
  --brand: #1389c9;
  --brand-2: #58c6e8;
  --brand-rgb: 19, 137, 201;
  --shadow: 0 24px 70px rgba(21, 105, 150, 0.14);
  --shadow-sm: 0 12px 34px rgba(21, 105, 150, 0.11);
}

body.page-renu {
  --bg: #f7fcfb;
  --surface-soft: #eaf8f4;
  --brand: #169e91;
  --brand-2: #65cdb8;
  --brand-rgb: 22, 158, 145;
  --shadow: 0 24px 70px rgba(16, 105, 96, 0.14);
  --shadow-sm: 0 12px 34px rgba(16, 105, 96, 0.11);
}

body.page-gold {
  --bg: #fbfaf6;
  --surface-soft: #f6f0df;
  --brand: #ae7d1f;
  --brand-2: #d7b85e;
  --brand-rgb: 174, 125, 31;
  --shadow: 0 24px 70px rgba(27, 43, 78, 0.18);
  --shadow-sm: 0 12px 34px rgba(72, 52, 20, 0.13);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 8% 0%, rgba(var(--brand-rgb), .10), transparent 30rem),
    radial-gradient(circle at 92% 18%, rgba(var(--brand-rgb), .07), transparent 24rem),
    var(--bg);
  line-height: 1.78;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; }
button, input, textarea, select { font: inherit; }

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  transform: translateY(-140%);
  background: var(--text);
  color: #fff;
  padding: 10px 16px;
  border-radius: 10px;
  z-index: 9999;
}
.skip-link:focus { transform: translateY(0); }

.container {
  width: min(calc(100% - 40px), var(--container));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, .82);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(83, 66, 57, .08);
  transition: box-shadow .25s ease, background .25s ease;
}
.site-header.is-scrolled {
  box-shadow: 0 10px 36px rgba(44, 31, 24, .08);
  background: rgba(255, 255, 255, .94);
}
.header-inner {
  min-height: 82px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}
.brand-link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  min-width: 220px;
}
.brand-logo {
  width: 250px;
  height: auto;
}
.site-nav { display: flex; align-items: center; gap: 8px; }
.site-nav a {
  text-decoration: none;
  color: #504640;
  font-weight: 700;
  letter-spacing: .02em;
  padding: 11px 17px;
  border-radius: 999px;
  transition: .2s ease;
}
.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--brand);
  background: rgba(var(--brand-rgb), .10);
}
.nav-toggle {
  display: none;
  width: 46px;
  height: 46px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: #fff;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
}
.nav-toggle span {
  width: 21px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: .2s ease;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.hero {
  padding: 76px 0 62px;
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(360px, .98fr);
  gap: 64px;
  align-items: center;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 20px;
  color: var(--brand);
  font-weight: 800;
  letter-spacing: .14em;
  text-transform: uppercase;
  font-size: .82rem;
}
.eyebrow::before {
  content: "";
  width: 36px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
}
.hero h1 {
  margin: 0;
  font-size: clamp(2.65rem, 5.5vw, 5.2rem);
  line-height: 1.04;
  letter-spacing: -.055em;
}
.hero h1 .accent { color: var(--brand); }
.hero-lead {
  margin: 26px 0 0;
  max-width: 670px;
  color: var(--muted);
  font-size: clamp(1.08rem, 1.65vw, 1.3rem);
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 50px;
  padding: 12px 21px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 800;
  border: 1px solid transparent;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  box-shadow: 0 13px 30px rgba(var(--brand-rgb), .28);
}
.btn-secondary {
  background: rgba(255,255,255,.82);
  border-color: var(--line);
  color: var(--text);
}
.btn svg { width: 18px; height: 18px; }

.hero-visual {
  position: relative;
  min-height: 520px;
}
.hero-card {
  position: absolute;
  inset: 22px 8px 12px 40px;
  border-radius: 36px;
  background: linear-gradient(145deg, rgba(255,255,255,.96), rgba(255,255,255,.76));
  border: 1px solid rgba(255,255,255,.86);
  box-shadow: var(--shadow);
  overflow: hidden;
  display: grid;
  place-items: center;
}
.hero-card::before,
.hero-card::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(2px);
}
.hero-card::before {
  width: 330px;
  height: 330px;
  right: -80px;
  top: -120px;
  background: rgba(var(--brand-rgb), .16);
}
.hero-card::after {
  width: 260px;
  height: 260px;
  left: -90px;
  bottom: -90px;
  background: rgba(var(--brand-rgb), .09);
}
.molecule-art {
  position: relative;
  width: min(86%, 470px);
  aspect-ratio: 1;
  border-radius: 50%;
  border: 1px solid rgba(var(--brand-rgb), .18);
  background:
    radial-gradient(circle at center, rgba(var(--brand-rgb), .18) 0 10%, transparent 10.5%),
    radial-gradient(circle at 35% 35%, rgba(var(--brand-rgb), .15) 0 6%, transparent 6.5%),
    radial-gradient(circle at 67% 32%, rgba(var(--brand-rgb), .18) 0 7%, transparent 7.5%),
    radial-gradient(circle at 30% 67%, rgba(var(--brand-rgb), .12) 0 7%, transparent 7.5%),
    radial-gradient(circle at 70% 70%, rgba(var(--brand-rgb), .16) 0 8%, transparent 8.5%),
    repeating-radial-gradient(circle at center, transparent 0 52px, rgba(var(--brand-rgb), .13) 53px 54px, transparent 55px 84px);
}
.molecule-art .core {
  position: absolute;
  inset: 50%;
  width: 118px;
  height: 118px;
  transform: translate(-50%, -50%);
  border-radius: 36px;
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 1.25rem;
  line-height: 1.15;
  text-align: center;
  font-weight: 900;
  background: linear-gradient(145deg, var(--brand), var(--brand-2));
  box-shadow: 0 18px 38px rgba(var(--brand-rgb), .30);
}
.orbit-dot {
  position: absolute;
  width: 18px;
  height: 18px;
  border: 4px solid #fff;
  border-radius: 50%;
  background: var(--brand);
  box-shadow: 0 5px 16px rgba(var(--brand-rgb), .25);
}
.orbit-dot:nth-child(2) { top: 11%; left: 48%; animation: float 4.6s ease-in-out infinite; }
.orbit-dot:nth-child(3) { right: 13%; top: 48%; animation: float 5.2s ease-in-out infinite .7s; }
.orbit-dot:nth-child(4) { bottom: 14%; left: 50%; animation: float 4.2s ease-in-out infinite 1.1s; }
.orbit-dot:nth-child(5) { left: 13%; top: 50%; animation: float 5.5s ease-in-out infinite .4s; }
.hero-note {
  position: absolute;
  right: -4px;
  bottom: 0;
  width: 205px;
  padding: 18px 19px;
  border-radius: 20px;
  color: #fff;
  background: linear-gradient(145deg, var(--brand), var(--brand-2));
  box-shadow: 0 16px 35px rgba(var(--brand-rgb), .25);
  font-weight: 800;
  line-height: 1.5;
}
.hero-note small { display: block; opacity: .82; font-weight: 600; margin-top: 4px; }
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }

.product-hero-card {
  position: absolute;
  inset: 0;
  border-radius: 36px;
  overflow: hidden;
  box-shadow: var(--shadow);
  background: #fff;
}
.product-hero-card img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  padding: 26px;
}
.product-hero-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255,255,255,0) 56%, rgba(4, 35, 54, .06));
  pointer-events: none;
}


.gold-hero {
  background:
    radial-gradient(circle at 78% 28%, rgba(215, 184, 94, .18), transparent 24rem),
    radial-gradient(circle at 92% 8%, rgba(27, 43, 78, .09), transparent 22rem);
}
.gold-product-card {
  background: linear-gradient(145deg, #fff, #f4ead0);
  border: 1px solid rgba(174, 125, 31, .18);
}
.gold-product-card img { object-position: center; }
.gold-product-card::after {
  background: linear-gradient(180deg, transparent 58%, rgba(20, 34, 68, .32));
}
.gold-badge {
  position: absolute;
  right: -6px;
  bottom: -8px;
  width: 128px;
  height: 128px;
  border-radius: 50%;
  color: #1c2d55;
  background: linear-gradient(145deg, #f8e8a7, #c8962e);
  border: 5px solid rgba(255,255,255,.9);
  box-shadow: 0 18px 42px rgba(65, 44, 10, .22);
  display: grid;
  place-content: center;
  text-align: center;
  line-height: 1;
}
.gold-badge strong { font-size: 2rem; }
.gold-badge span { position: absolute; right: 24px; top: 23px; font-size: .72rem; font-weight: 900; }
.gold-badge small { margin-top: 7px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; font-size: .65rem; }
.gold-story-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, .92fr);
  gap: 42px;
  align-items: stretch;
}
.gold-story-image {
  margin: 0;
  min-height: 480px;
  overflow: hidden;
  border-radius: 30px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(174, 125, 31, .12);
}
.gold-story-image img { width: 100%; height: 100%; object-fit: cover; }
.gold-story-copy {
  padding: 44px;
  border-radius: 30px;
  background: linear-gradient(145deg, #17284e, #263c6e);
  color: #fff;
  box-shadow: var(--shadow);
}
.gold-story-copy h3 { margin: 24px 0 15px; font-size: clamp(1.7rem, 3vw, 2.5rem); line-height: 1.25; }
.gold-story-copy p { color: rgba(255,255,255,.78); margin: 0 0 17px; }
.gold-symbol {
  display: inline-flex;
  align-items: flex-start;
  gap: 4px;
  font-size: 3.6rem;
  font-weight: 900;
  color: #f0cf72;
  line-height: 1;
}
.gold-symbol small { font-size: .78rem; margin-top: 4px; }
.gold-gallery { margin-bottom: 22px; }
.gold-gallery .gallery-main img,
.gold-gallery .gallery-side img { object-fit: cover; padding: 0; }
.gold-use-cards { margin-top: 22px; }
.video-grid-single { align-items: stretch; }
.gold-product-panel { height: 100%; }
.gold-product-panel img { height: 400px; object-fit: contain; padding: 18px; background: linear-gradient(145deg, #edf3f8, #fff); }

.section { padding: 88px 0; }
.section-tight { padding: 62px 0; }
.section-soft {
  background: linear-gradient(180deg, rgba(255,255,255,.65), rgba(var(--brand-rgb), .05));
  border-top: 1px solid rgba(var(--brand-rgb), .08);
  border-bottom: 1px solid rgba(var(--brand-rgb), .08);
}
.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: 36px;
}
.section-heading > div { max-width: 760px; }
.kicker {
  margin: 0 0 10px;
  color: var(--brand);
  font-size: .84rem;
  font-weight: 900;
  letter-spacing: .15em;
  text-transform: uppercase;
}
.section-title {
  margin: 0;
  font-size: clamp(2rem, 3.6vw, 3.35rem);
  line-height: 1.16;
  letter-spacing: -.035em;
}
.section-desc {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.two-col {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}
.three-col {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}
.card {
  background: rgba(255,255,255,.88);
  border: 1px solid rgba(76,55,44,.10);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}
.feature-card {
  position: relative;
  padding: 34px;
  overflow: hidden;
}
.feature-card::after {
  content: "";
  position: absolute;
  width: 150px;
  height: 150px;
  right: -56px;
  bottom: -64px;
  border-radius: 50%;
  background: rgba(var(--brand-rgb), .08);
}
.feature-number {
  display: inline-grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 15px;
  color: #fff;
  background: linear-gradient(145deg, var(--brand), var(--brand-2));
  font-weight: 900;
  box-shadow: 0 10px 24px rgba(var(--brand-rgb), .2);
}
.feature-card h3 { margin: 22px 0 10px; font-size: 1.36rem; }
.feature-card p { margin: 0; color: var(--muted); }

.prose-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(300px, .9fr);
  gap: 56px;
  align-items: start;
}
.prose h2, .prose h3 { line-height: 1.3; }
.prose h2 { font-size: clamp(2rem, 3.4vw, 3.2rem); margin: 0 0 22px; }
.prose h3 { font-size: 1.35rem; margin: 30px 0 10px; }
.prose p { color: var(--muted); margin: 0 0 17px; }
.callout {
  padding: 30px;
  border-radius: var(--radius-lg);
  background: linear-gradient(145deg, rgba(var(--brand-rgb), .13), rgba(255,255,255,.88));
  border: 1px solid rgba(var(--brand-rgb), .16);
}
.callout strong { color: var(--brand); }
.quote {
  margin: 0;
  padding-left: 22px;
  border-left: 4px solid var(--brand);
  font-size: 1.22rem;
  font-weight: 800;
  line-height: 1.7;
}
.quote small { display: block; color: var(--muted); font-weight: 600; margin-top: 10px; }

.media-card { overflow: hidden; }
.media-card img { width: 100%; height: 300px; object-fit: cover; }
.media-card .content { padding: 24px; }
.media-card h3 { margin: 0 0 8px; }
.media-card p { margin: 0; color: var(--muted); }
.media-card.tall img { height: 470px; object-fit: contain; background: #fff; padding: 14px; }

.benefit-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}
.benefit-card {
  overflow: hidden;
  border-radius: 22px;
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: 0 10px 30px rgba(42, 31, 24, .07);
  transition: transform .2s ease, box-shadow .2s ease;
}
.benefit-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-sm); }
.benefit-card img { width: 100%; aspect-ratio: 1; object-fit: cover; }
.benefit-card h3 { margin: 0; padding: 18px 20px 20px; font-size: 1.05rem; }

.steps {
  counter-reset: step;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}
.step {
  position: relative;
  padding: 30px;
  border-radius: 24px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
}
.step::before {
  counter-increment: step;
  content: "0" counter(step);
  display: block;
  margin-bottom: 34px;
  color: var(--brand);
  font-weight: 900;
  letter-spacing: .08em;
}
.step h3 { margin: 0 0 10px; }
.step p { margin: 0; color: var(--muted); }

.video-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}
.video-card {
  overflow: hidden;
  border-radius: 24px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
}
.video-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  background: #151515;
}
.video-frame img,
.video-frame iframe { width: 100%; height: 100%; object-fit: cover; border: 0; }
.video-play {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  border: 0;
  cursor: pointer;
  color: #fff;
  background: rgba(var(--brand-rgb), .94);
  box-shadow: 0 15px 34px rgba(0,0,0,.25);
  display: grid;
  place-items: center;
  transition: transform .2s ease;
}
.video-play:hover { transform: scale(1.06); }
.video-play svg { width: 28px; height: 28px; margin-left: 4px; }
.video-info { padding: 20px 22px 23px; }
.video-info h3 { margin: 0; font-size: 1.08rem; }
.video-info p { margin: 7px 0 0; color: var(--muted); font-size: .94rem; }

.doc-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 14px;
}
.doc-link {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  padding: 17px 18px;
  border-radius: 17px;
  background: rgba(255,255,255,.9);
  border: 1px solid var(--line);
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.doc-link:hover {
  transform: translateY(-2px);
  border-color: rgba(var(--brand-rgb), .4);
  box-shadow: 0 10px 25px rgba(var(--brand-rgb), .10);
}
.doc-icon {
  flex: 0 0 42px;
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 13px;
  color: var(--brand);
  background: rgba(var(--brand-rgb), .11);
}
.doc-icon svg { width: 21px; height: 21px; }
.doc-link strong { display: block; line-height: 1.35; }
.doc-link small { display: block; margin-top: 4px; color: var(--muted); }

.gallery {
  display: grid;
  grid-template-columns: 1.25fr .75fr;
  gap: 22px;
}
.gallery-main,
.gallery-side { overflow: hidden; border-radius: 26px; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow-sm); }
.gallery-main img { width: 100%; height: 100%; min-height: 520px; object-fit: contain; padding: 14px; }
.gallery-side img { width: 100%; height: 100%; min-height: 520px; object-fit: cover; }

.notice {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 20px 22px;
  border-radius: 18px;
  background: rgba(var(--brand-rgb), .08);
  border: 1px solid rgba(var(--brand-rgb), .16);
  color: #4f4540;
}
.notice svg { flex: 0 0 22px; width: 22px; height: 22px; color: var(--brand); margin-top: 3px; }
.notice p { margin: 0; }

.cta {
  padding: 52px;
  border-radius: 34px;
  color: #fff;
  background:
    radial-gradient(circle at 15% 20%, rgba(255,255,255,.20), transparent 22rem),
    linear-gradient(135deg, var(--brand), var(--brand-2));
  box-shadow: 0 24px 55px rgba(var(--brand-rgb), .25);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}
.cta h2 { margin: 0; font-size: clamp(2rem, 4vw, 3.2rem); line-height: 1.18; }
.cta p { margin: 14px 0 0; opacity: .88; }
.cta .btn-secondary { white-space: nowrap; background: #fff; border: 0; }

.site-footer {
  margin-top: 84px;
  padding: 50px 0 34px;
  background: #2a2522;
  color: rgba(255,255,255,.78);
}
.footer-top {
  display: grid;
  grid-template-columns: 1.3fr .7fr;
  gap: 40px;
  align-items: start;
}
.footer-logo { width: 255px; filter: drop-shadow(0 8px 20px rgba(0,0,0,.18)); }
.footer-copy { margin: 18px 0 0; max-width: 560px; }
.footer-nav { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 10px; }
.footer-nav a { text-decoration: none; color: #fff; padding: 8px 12px; border-radius: 10px; background: rgba(255,255,255,.06); }
.footer-bottom {
  margin-top: 34px;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,.11);
  font-size: .88rem;
  display: flex;
  justify-content: space-between;
  gap: 20px;
}

.reveal { opacity: 0; transform: translateY(20px); transition: opacity .65s ease, transform .65s ease; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}

@media (max-width: 980px) {
  .brand-link { min-width: auto; }
  .brand-logo { width: 210px; }
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: absolute;
    left: 20px;
    right: 20px;
    top: calc(100% + 10px);
    padding: 12px;
    border-radius: 20px;
    background: rgba(255,255,255,.97);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--line);
    display: grid;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: .2s ease;
  }
  .site-nav.is-open { opacity: 1; visibility: visible; transform: translateY(0); }
  .site-nav a { text-align: center; }
  .hero { padding-top: 54px; }
  .hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .hero-visual { min-height: 500px; }
  .hero-card { inset: 0 28px 0 28px; }
  .product-hero-card { inset: 0 34px; }
  .prose-grid { grid-template-columns: 1fr; gap: 30px; }
  .three-col, .steps { grid-template-columns: 1fr 1fr; }
  .benefit-grid { grid-template-columns: repeat(2, 1fr); }
  .gallery { grid-template-columns: 1fr; }
  .gold-story-grid { grid-template-columns: 1fr; }
  .gallery-main img, .gallery-side img { min-height: auto; max-height: 630px; }
  .cta { align-items: flex-start; flex-direction: column; }
}

@media (max-width: 700px) {
  .container { width: min(calc(100% - 28px), var(--container)); }
  .header-inner { min-height: 70px; }
  .brand-logo { width: 180px; }
  .hero { padding: 44px 0 46px; }
  .hero h1 { font-size: clamp(2.55rem, 13vw, 4.2rem); }
  .hero-actions { flex-direction: column; }
  .btn { width: 100%; }
  .hero-visual { min-height: 390px; }
  .hero-card { inset: 0; border-radius: 26px; }
  .product-hero-card { inset: 0; border-radius: 26px; }
  .molecule-art { width: 86%; }
  .molecule-art .core { width: 96px; height: 96px; font-size: 1.05rem; border-radius: 28px; }
  .hero-note { right: 8px; bottom: -12px; width: 175px; font-size: .9rem; }
  .gold-badge { width: 98px; height: 98px; right: -4px; bottom: -10px; }
  .gold-badge strong { font-size: 1.55rem; }
  .gold-badge span { right: 18px; top: 18px; }
  .gold-story-image { min-height: 340px; }
  .gold-story-copy { padding: 30px; }
  .gold-product-panel img { height: 320px; }
  .section { padding: 66px 0; }
  .section-tight { padding: 48px 0; }
  .section-heading { align-items: flex-start; flex-direction: column; margin-bottom: 28px; }
  .two-col, .three-col, .steps, .benefit-grid, .video-grid, .doc-list { grid-template-columns: 1fr; }
  .feature-card { padding: 28px; }
  .media-card img { height: 250px; }
  .media-card.tall img { height: auto; max-height: 560px; }
  .cta { padding: 34px 28px; border-radius: 26px; }
  .footer-top { grid-template-columns: 1fr; }
  .footer-nav { justify-content: flex-start; }
  .footer-bottom { flex-direction: column; }
}


body.page-water .product-hero-card, body.page-renu .product-hero-card { background: linear-gradient(180deg, #ffffff, rgba(255,255,255,.96)); }
body.page-water .product-hero-card img, body.page-renu .product-hero-card img { filter: drop-shadow(0 22px 40px rgba(23,64,98,.10)); }

.no-break-title { white-space: nowrap; }
@media (max-width: 900px) { .no-break-title { font-size: clamp(1.5rem, 3.8vw, 2.2rem); } }
@media (max-width: 640px) { .no-break-title { font-size: 1.22rem; letter-spacing: -.02em; } }


/* v1.7 direct product hero images */
body.page-water .hero-visual,
body.page-renu .hero-visual {
  aspect-ratio: 1 / 1;
  min-height: 0;
}
body.page-water .product-hero-card,
body.page-renu .product-hero-card {
  background: #fff;
}
body.page-water .product-hero-card img,
body.page-renu .product-hero-card img {
  width: 100%;
  height: 100%;
  padding: 0;
  object-fit: cover;
  object-position: center;
  filter: none;
}
body.page-water .product-hero-card::after,
body.page-renu .product-hero-card::after {
  display: none;
}


/* v1.8 official science source components */
.science-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}
.science-card {
  position: relative;
  padding: 28px 28px 26px;
  border-radius: 22px;
  background: rgba(255,255,255,.94);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
}
.science-card > span {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 14px;
  color: var(--brand);
  background: rgba(var(--brand-rgb), .11);
  font-weight: 900;
  letter-spacing: .05em;
}
.science-card h3 { margin: 18px 0 8px; font-size: 1.18rem; }
.science-card p { margin: 0; color: var(--muted); }
.source-panel {
  margin-top: 24px;
  padding: 28px;
  border-radius: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  background: linear-gradient(135deg, rgba(var(--brand-rgb), .13), rgba(255,255,255,.92));
  border: 1px solid rgba(var(--brand-rgb), .2);
}
.source-panel strong { font-size: 1.12rem; }
.source-panel p { margin: 6px 0 0; max-width: 680px; color: var(--muted); }
.source-actions { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 10px; flex: 0 0 auto; }
.faq-list { display: grid; gap: 12px; margin-top: 24px; }
.faq-item {
  border-radius: 17px;
  background: rgba(255,255,255,.92);
  border: 1px solid var(--line);
  overflow: hidden;
}
.faq-item summary { cursor: pointer; padding: 18px 21px; font-weight: 800; list-style: none; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; float: right; color: var(--brand); font-size: 1.25rem; line-height: 1; }
.faq-item[open] summary::after { content: "−"; }
.faq-item p { margin: 0; padding: 0 21px 20px; color: var(--muted); }
.official-product-link {
  margin-top: 24px;
  padding: 20px 22px;
  display: grid;
  grid-template-columns: auto minmax(0,1fr) auto;
  align-items: center;
  gap: 16px;
  border-radius: 20px;
  background: rgba(255,255,255,.94);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
}
.official-product-link p { margin: 4px 0 0; color: var(--muted); }
#science .notice, #usage .notice { margin-top: 24px; }
@media (max-width: 900px) {
  .source-panel { align-items: flex-start; flex-direction: column; }
  .source-actions { justify-content: flex-start; }
  .official-product-link { grid-template-columns: auto minmax(0,1fr); }
  .official-product-link .btn { grid-column: 1 / -1; width: 100%; }
}
@media (max-width: 700px) {
  .science-grid { grid-template-columns: 1fr; }
  .science-card { padding: 24px; }
  .source-panel { padding: 24px; }
  .source-actions { width: 100%; }
  .source-actions .btn { width: 100%; }
  .site-nav a { padding: 10px 12px; }
}