/* ============================================================
   沙海驼绫 · 落地页样式
   东方古典 · 红金大气 · 单页长滚动
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
  /* Vermilion (default) */
  --c-red: #b3322a;
  --c-red-deep: #7d1f1a;
  --c-red-soft: #d96c54;
  --c-gold: #b8924b;
  --c-gold-bright: #d4af6a;
  --c-gold-pale: #e7d3a3;
  --c-ink: #653224;
  --c-ink-soft: #4a382d;
  --c-paper: #f8f1e1;
  --c-paper-warm: #f3e7cd;
  --c-paper-deep: #ead7b3;
  --c-sand: #e8d5b7;
  --c-camel: #b58a5e;
  --c-camel-deep: #8a5d33;

  --c-bg: #f8f1e1;
  --c-bg-2: #f3e7cd;
  --c-bg-deep: #653224;
  --c-bg-mid: #3a261a;

  --font-zh: 'Noto Serif SC', 'Songti SC', 'STSong', serif;
  --font-display: 'Noto Serif SC', 'STSong', serif;
  --font-en: 'Cormorant Garamond', 'Times New Roman', serif;
  --font-num: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-brush: 'Ma Shan Zheng', 'Noto Serif SC', serif;

  --shadow-sm: 0 2px 12px rgba(101, 50, 36, 0.06);
  --shadow-md: 0 14px 40px -10px rgba(101, 50, 36, 0.18);
  --shadow-lg: 0 30px 80px -20px rgba(101, 50, 36, 0.28);

  --r-sm: 4px;
  --r-md: 8px;
}

/* palette: ink (deep ink + gold) */
[data-palette="ink"] {
  --c-red: #6e2722;
  --c-red-deep: #3a1410;
  --c-bg: #f0e9d8;
  --c-bg-2: #e6dcc1;
  --c-gold: #c5a25a;
  --c-gold-bright: #e0bf76;
}
/* palette: sand (lighter, warm sand) */
[data-palette="sand"] {
  --c-red: #ad4530;
  --c-red-deep: #8d3220;
  --c-bg: #faf3e3;
  --c-bg-2: #f0e3c5;
  --c-camel: #c39466;
}

/* font: brush (ma shan zheng for display) */
[data-display-font="brush"] {
  --font-display: 'Ma Shan Zheng', 'Noto Serif SC', serif;
}
[data-display-font="xiaowei"] {
  --font-display: 'ZCOOL XiaoWei', 'Noto Serif SC', serif;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-zh);
  color: var(--c-ink);
  background: var(--c-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
a { color: inherit; text-decoration: none; }
ul, ol { padding: 0; margin: 0; list-style: none; }
em { font-style: normal; }


/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 30px;
  font-family: var(--font-zh);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.15em;
  border-radius: 2px;
  position: relative;
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}
.btn--lg { padding: 18px 38px; font-size: 16px; }
.btn--primary {
  background: var(--c-red);
  color: var(--c-paper);
  box-shadow: 0 8px 24px -6px rgba(179, 50, 42, 0.5),
              inset 0 0 0 1px var(--c-gold-bright);
}
.btn--primary::before {
  content: '';
  position: absolute;
  inset: 4px;
  border: 1px solid rgba(232, 211, 163, 0.45);
  border-radius: 1px;
  pointer-events: none;
}
.btn--primary:hover {
  background: var(--c-red-deep);
  transform: translateY(-2px);
  box-shadow: 0 14px 32px -8px rgba(179, 50, 42, 0.6),
              inset 0 0 0 1px var(--c-gold-bright);
}
.btn--ghost {
  color: var(--c-red);
  border: 1px solid currentColor;
  background: transparent;
}
.btn--ghost:hover {
  background: var(--c-red);
  color: var(--c-paper);
}


/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 80;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 48px;
  background: rgba(248, 241, 225, 0.0);
  backdrop-filter: blur(0);
  transition: background 0.4s, padding 0.4s, box-shadow 0.4s;
}
.nav.is-scrolled {
  background: rgba(248, 241, 225, 0.92);
  backdrop-filter: blur(12px);
  padding: 12px 48px;
  box-shadow: 0 1px 0 rgba(184, 146, 75, 0.18), 0 6px 18px -10px rgba(101, 50, 36, 0.18);
}
.nav__brand { display: flex; align-items: center; gap: 12px; }
.nav__logo { width: 36px; height: auto; filter: drop-shadow(0 2px 6px rgba(0, 0, 0, 0.2)); }
.nav__name { display: flex; flex-direction: column; line-height: 1.1; }
.nav__name-zh { font-family: var(--font-display); font-size: 18px; font-weight: 600; letter-spacing: 0.2em; color: var(--c-ink); }
.nav__name-en { font-family: var(--font-en); font-size: 10px; letter-spacing: 0.25em; color: var(--c-gold); margin-top: 2px; }

.nav__links {
  display: flex;
  gap: 38px;
  font-family: var(--font-display);
  font-size: 15px;
  letter-spacing: 0.18em;
}
.nav__links a {
  position: relative;
  padding: 6px 0;
  transition: color 0.25s;
}
.nav__links a::after {
  content: '';
  position: absolute;
  left: 50%; bottom: 0;
  width: 0; height: 1px;
  background: var(--c-red);
  transition: all 0.3s;
  transform: translateX(-50%);
}
.nav__links a:hover { color: var(--c-red); }
.nav__links a:hover::after { width: 100%; }

.nav__cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  background: var(--c-red);
  color: var(--c-paper);
  font-size: 14px;
  letter-spacing: 0.18em;
  border-radius: 2px;
  box-shadow: inset 0 0 0 1px var(--c-gold-bright);
  transition: all 0.25s;
}
.nav__cta:hover { background: var(--c-red-deep); }
.nav__cta-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--c-gold-bright);
  box-shadow: 0 0 8px var(--c-gold-bright);
}


/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  padding: 0 48px;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 70% 30%, #fff3d0 0%, transparent 55%),
    linear-gradient(180deg, #faf3e3 0%, #f3e7cd 60%, #e8d5b7 100%);
}
.hero__bg { position: absolute; inset: 0; overflow: hidden; z-index: 0; }
.hero__sun {
  position: absolute;
  top: 14%; right: 16%;
  width: 320px; height: 320px;
  border-radius: 50%;
  background:
    radial-gradient(circle, rgba(212, 175, 106, 0.55) 0%, rgba(232, 211, 163, 0.18) 40%, transparent 70%);
  filter: blur(8px);
}
.hero__dunes {
  position: absolute;
  left: -10%; right: -10%;
  height: 50%;
  background-repeat: no-repeat;
  background-size: cover;
}
.hero__dunes--1 {
  bottom: -2%;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1600 600' preserveAspectRatio='none'><path d='M0 500 Q 300 380 600 440 T 1200 420 T 1600 460 L 1600 600 L 0 600 Z' fill='%23b58a5e' opacity='0.85'/></svg>");
}
.hero__dunes--2 {
  bottom: 6%;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1600 600' preserveAspectRatio='none'><path d='M0 480 Q 400 360 800 410 T 1600 420 L 1600 600 L 0 600 Z' fill='%23c39466' opacity='0.65'/></svg>");
}
.hero__dunes--3 {
  bottom: 14%;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1600 600' preserveAspectRatio='none'><path d='M0 440 Q 500 380 1000 400 T 1600 420 L 1600 600 L 0 600 Z' fill='%23d8b88a' opacity='0.45'/></svg>");
}
.hero__cloud {
  position: absolute;
  width: 260px; height: 90px;
  opacity: 0.55;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 260 90' fill='none' stroke='%23b8924b' stroke-width='1.4'><path d='M10 60 Q 10 30 40 30 Q 50 10 80 20 Q 100 8 130 25 Q 160 10 180 30 Q 220 25 230 50 Q 250 60 240 80 L 20 80 Q 5 80 10 60 Z'/></svg>");
  background-repeat: no-repeat;
  background-size: contain;
}
.hero__cloud--a { top: 18%; left: 8%; animation: drift 28s linear infinite; }
.hero__cloud--b { top: 30%; right: 22%; width: 200px; animation: drift 36s linear infinite reverse; opacity: 0.4; }
[data-show-clouds="false"] .hero__cloud { display: none; }

@keyframes drift {
  0%   { transform: translateX(0); }
  50%  { transform: translateX(40px); }
  100% { transform: translateX(0); }
}

.hero__seal-mark {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--font-brush);
  font-size: 60vw;
  color: rgba(179, 50, 42, 0.04);
  z-index: 0;
  user-select: none;
  pointer-events: none;
  line-height: 1;
  letter-spacing: -0.05em;
}

.hero__inner {
  position: relative;
  z-index: 2;
  min-height: 100vh;
  padding-top: 110px;
  padding-bottom: 180px;
  display: grid;
  grid-template-columns: 80px 1fr 100px;
  gap: 40px;
  align-items: center;
}

.hero__rail {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  height: 60vh;
  justify-content: center;
}
.hero__rail-line {
  flex: 1;
  width: 1px;
  background: linear-gradient(to bottom, transparent, var(--c-gold) 30%, var(--c-gold) 70%, transparent);
  min-height: 80px;
}
.hero__rail-text {
  writing-mode: vertical-rl;
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.35em;
  color: var(--c-gold);
  white-space: nowrap;
}
.hero__rail--right { gap: 28px; }
.hero__rail--right .hero__rail-cn {
  writing-mode: vertical-rl;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 18px;
  letter-spacing: 0.6em;
  color: var(--c-red);
  line-height: 2;
}
.hero__seal {
  width: 56px;
  height: auto;
  filter: drop-shadow(0 4px 12px rgba(179, 50, 42, 0.3));
  animation: sealFloat 6s ease-in-out infinite;
}
@keyframes sealFloat { 50% { transform: translateY(-6px); } }
[data-show-seals="false"] .hero__seal { display: none; }

.hero__center {
  text-align: center;
  position: relative;
}
.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.4em;
  color: var(--c-red);
  margin: 0 0 36px;
}
.hero__eyebrow-flourish {
  display: inline-block;
  width: 60px; height: 1px;
  background: var(--c-red);
  position: relative;
}
.hero__eyebrow-flourish::before,
.hero__eyebrow-flourish::after {
  content: '';
  position: absolute;
  width: 4px; height: 4px;
  top: -1.5px;
  background: var(--c-gold-bright);
  border-radius: 50%;
}
.hero__eyebrow-flourish::before { left: -2px; }
.hero__eyebrow-flourish::after  { right: -2px; }

.hero__title {
  margin: 0 0 32px;
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1;
}
.hero__title-row { display: inline-flex; gap: 6px; }
.hero__char {
  display: inline-block;
  font-size: clamp(80px, 11vw, 168px);
  color: var(--c-ink);
  position: relative;
  padding: 0 6px;
  text-shadow: 0 8px 24px rgba(101, 50, 36, 0.1);
}
.hero__char--accent {
  color: var(--c-red);
  text-shadow: 0 8px 24px rgba(179, 50, 42, 0.25);
}
.hero__char--accent::after {
  content: '';
  position: absolute;
  bottom: 8%;
  left: 50%;
  transform: translateX(-50%);
  width: 70%;
  height: 4px;
  background: linear-gradient(90deg, transparent, var(--c-gold-bright), transparent);
  opacity: 0.6;
}

.hero__slogan {
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 24px);
  font-weight: 500;
  letter-spacing: 0.1em;
  margin: 0 0 18px;
  color: var(--c-ink-soft);
}
.hero__slogan em {
  color: var(--c-red);
  border-bottom: 2px dotted var(--c-gold-bright);
  padding-bottom: 2px;
}
.hero__sub {
  font-family: var(--font-en), var(--font-display);
  font-size: 15px;
  letter-spacing: 0.18em;
  line-height: 2;
  color: var(--c-ink-soft);
  margin: 0 0 44px;
}

.hero__actions {
  display: inline-flex;
  gap: 20px;
  align-items: center;
}

.hero__scroll {
  position: absolute;
  left: 50%;
  bottom: 80px;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.4em;
  color: var(--c-gold);
  z-index: 3;
}
.hero__scroll-bar {
  width: 1px; height: 50px;
  background: linear-gradient(to bottom, var(--c-gold), transparent);
  position: relative;
  overflow: hidden;
}
.hero__scroll-bar::after {
  content: '';
  position: absolute;
  top: -50%;
  left: 0; right: 0;
  height: 50%;
  background: var(--c-gold-bright);
  animation: scrollDrop 1.8s ease-in-out infinite;
}
@keyframes scrollDrop {
  0% { top: -50%; }
  100% { top: 100%; }
}

.hero__stats {
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: min(1200px, calc(100% - 96px));
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 26px 56px;
  background:
    linear-gradient(180deg, rgba(101, 50, 36, 0.92), rgba(101, 50, 36, 0.98));
  border-top: 1px solid var(--c-gold);
  z-index: 4;
  box-shadow: 0 -10px 40px -10px rgba(101, 50, 36, 0.3);
}
.hero__stat { display: flex; flex-direction: column; align-items: center; color: var(--c-paper); flex: 1; }
.hero__stat-num {
  font-family: var(--font-num);
  font-size: 44px;
  font-weight: 400;
  color: var(--c-gold-bright);
  line-height: 1;
  margin-bottom: 8px;
}
.hero__stat-num sup {
  font-size: 14px;
  font-family: var(--font-en);
  color: var(--c-gold);
  margin-left: 2px;
}
.hero__stat-label {
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: rgba(248, 241, 225, 0.75);
}
.hero__stat-div {
  width: 1px;
  height: 50px;
  background: linear-gradient(to bottom, transparent, var(--c-gold) 50%, transparent);
}


/* ============================================================
   Section commons
   ============================================================ */
.section {
  position: relative;
  padding: 160px 48px 140px;
  max-width: 1600px;
  margin: 0 auto;
}
.section--structure,
.section--products {
  background: var(--c-bg-deep);
  color: var(--c-paper);
  max-width: none;
  margin: 0;
}

.section__chapter {
  display: flex;
  align-items: center;
  gap: 22px;
  margin-bottom: 60px;
  max-width: 1300px;
  margin-left: auto; margin-right: auto;
}
.section__chapter-no {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 600;
  color: var(--c-red);
  width: 64px; height: 64px;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1.5px solid var(--c-red);
  position: relative;
  background: var(--c-paper);
}
.section__chapter-no::before,
.section__chapter-no::after {
  content: '';
  position: absolute;
  width: 8px; height: 8px;
  background: var(--c-red);
}
.section__chapter-no::before { top: -1px; left: -1px; }
.section__chapter-no::after { bottom: -1px; right: -1px; }
.section__chapter-cn {
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: 0.3em;
  color: var(--c-ink);
}
.section__chapter-en {
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.4em;
  color: var(--c-gold);
  margin-left: auto;
}
.section__chapter--light .section__chapter-no { background: transparent; color: var(--c-gold-bright); border-color: var(--c-gold-bright); }
.section__chapter--light .section__chapter-no::before,
.section__chapter--light .section__chapter-no::after { background: var(--c-gold-bright); }
.section__chapter--light .section__chapter-cn { color: var(--c-paper); }
.section__chapter--light .section__chapter-en { color: var(--c-gold); }

.section__title {
  font-family: var(--font-display);
  font-size: clamp(36px, 4vw, 60px);
  line-height: 1.25;
  font-weight: 600;
  margin: 0 0 28px;
  letter-spacing: 0.04em;
  position: relative;
}
.section__title em {
  color: var(--c-red);
  font-weight: 700;
  position: relative;
}
.section__title--light em { color: var(--c-gold-bright); }
.section__title--light { color: var(--c-paper); }
.section__title--center { text-align: center; }
.section__title-vline {
  display: inline-block;
  width: 4px; height: 28px;
  background: var(--c-red);
  margin-right: 14px;
  vertical-align: -6px;
}

.section__lead {
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 2;
  letter-spacing: 0.06em;
  color: var(--c-ink-soft);
  margin: 0 0 24px;
  max-width: 56ch;
}
.section__lead--center { margin-left: auto; margin-right: auto; text-align: center; }
.section__lead--light { color: rgba(248, 241, 225, 0.78); }
.section__lead strong { color: var(--c-red); font-weight: 600; }
.section__lead--light strong { color: var(--c-gold-bright); }
.section__lead em { color: var(--c-red); }
.section__lead--light em { color: var(--c-gold-bright); }

.section__body {
  font-size: 16px;
  line-height: 2;
  color: var(--c-ink-soft);
  max-width: 60ch;
  margin: 0 0 28px;
}
.section__body--quote {
  font-family: var(--font-display);
  font-size: 16.5px;
  color: var(--c-ink);
  padding: 22px 26px;
  border-left: 3px solid var(--c-red);
  background: rgba(212, 175, 106, 0.1);
  letter-spacing: 0.04em;
}
.section__body--quote em {
  display: inline-block;
  margin-top: 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  color: var(--c-red);
  letter-spacing: 0.1em;
}


/* ============================================================
   Source / 产地溯源 · 稀有
   ============================================================ */
.section--source { background: linear-gradient(180deg, var(--c-bg-2) 0%, var(--c-bg) 100%); }
.source__head { text-align: center; max-width: 800px; margin: 0 auto 56px; }

/* 三纤维对比 */
.fiber-cmp {
  max-width: 1000px;
  margin: 0 auto 44px;
  border: 1px solid rgba(184, 146, 75, 0.4);
  background: var(--c-paper);
  box-shadow: var(--shadow-sm);
}
.fiber-cmp__row {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.6fr;
  align-items: center;
  gap: 24px;
  padding: 22px 36px;
  border-bottom: 1px solid rgba(184, 146, 75, 0.18);
}
.fiber-cmp__row:last-child { border-bottom: none; }
.fiber-cmp__row--head {
  background: var(--c-ink);
  color: var(--c-gold-bright);
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.25em;
  padding: 16px 36px;
}
.fiber-cmp__row--star {
  background: linear-gradient(90deg, rgba(179, 50, 42, 0.08), rgba(212, 175, 106, 0.06));
  border-top: 1px solid var(--c-red);
}
.fiber-cmp__name {
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: 0.08em;
  color: var(--c-ink);
}
.fiber-cmp__row--star .fiber-cmp__name { color: var(--c-red); font-weight: 600; }
.fiber-cmp__val {
  font-family: var(--font-num);
  font-size: 30px;
  color: var(--c-ink);
  letter-spacing: 0.02em;
}
.fiber-cmp__row--star .fiber-cmp__val { color: var(--c-red); }
.fiber-cmp__val small { font-family: var(--font-display); font-size: 13px; margin-left: 4px; color: var(--c-ink-soft); }
.fiber-cmp__bar {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  height: 14px;
}
.fiber-cmp__bar i {
  display: block;
  height: 8px;
  background: linear-gradient(90deg, var(--c-camel), var(--c-gold-bright));
  border-radius: 4px;
  min-width: 6px;
}
.fiber-cmp__row--star .fiber-cmp__bar i { background: linear-gradient(90deg, var(--c-red), var(--c-gold-bright)); }
.fiber-cmp__bar b {
  font-family: var(--font-num);
  font-size: 17px;
  color: var(--c-ink-soft);
  font-weight: 400;
  white-space: nowrap;
}

.source__punch {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 80px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2vw, 24px);
  line-height: 1.9;
  color: var(--c-ink);
  letter-spacing: 0.04em;
}
.source__punch em { color: var(--c-red); font-weight: 700; font-family: var(--font-num); font-size: 1.15em; padding: 0 4px; }
.source__punch span {
  display: block;
  margin-top: 16px;
  font-size: 15px;
  color: var(--c-ink-soft);
  letter-spacing: 0.12em;
}

/* 三大产区 */
.regions {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 1300px;
  margin: 0 auto 90px;
}
.region {
  background: var(--c-paper);
  border: 1px solid rgba(184, 146, 75, 0.3);
  border-top: 3px solid var(--c-red);
  padding: 34px 30px 30px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: all 0.4s;
}
.region:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.region__head { margin-bottom: 22px; }
.region__no {
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.35em;
  color: var(--c-gold);
}
.region__name {
  font-family: var(--font-display);
  font-size: 30px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--c-red-deep);
  margin: 6px 0 8px;
}
.region__tag {
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--c-ink-soft);
}
.region__stat {
  display: flex;
  flex-direction: column;
  padding: 18px 0;
  margin-bottom: 18px;
  border-top: 1px dashed rgba(184, 146, 75, 0.4);
  border-bottom: 1px dashed rgba(184, 146, 75, 0.4);
}
.region__stat-num {
  font-family: var(--font-num);
  font-size: 44px;
  color: var(--c-red);
  line-height: 1;
}
.region__stat-num small { font-family: var(--font-display); font-size: 16px; color: var(--c-ink); margin-left: 6px; }
.region__stat-sub { font-size: 13px; color: var(--c-ink-soft); letter-spacing: 0.08em; margin-top: 8px; }
.region__body {
  font-size: 14.5px;
  line-height: 1.95;
  color: var(--c-ink-soft);
  margin: 0 0 20px;
  flex: 1;
}
.region__body strong { color: var(--c-red); font-weight: 600; }
.region__body em { color: var(--c-camel-deep); font-weight: 500; }
.region__neck {
  font-family: var(--font-display);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--c-paper);
  background: var(--c-ink);
  padding: 10px 16px;
  border-left: 2px solid var(--c-gold-bright);
}

/* 总结：两万吨 */
.grand {
  max-width: 1300px;
  margin: 0 auto 60px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  background: linear-gradient(135deg, var(--c-red) 0%, var(--c-red-deep) 100%);
  color: var(--c-paper);
  box-shadow: var(--shadow-md);
  position: relative;
}
.grand::before {
  content: '';
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(212, 175, 106, 0.45);
  pointer-events: none;
}
.grand__left { padding: 48px 44px; display: flex; flex-direction: column; justify-content: center; }
.grand__eyebrow {
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.15em;
  color: var(--c-gold-bright);
  margin-bottom: 12px;
}
.grand__num {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 22px;
}
.grand__num span {
  font-family: var(--font-num);
  font-size: 110px;
  line-height: 0.9;
  color: var(--c-gold-bright);
  letter-spacing: -0.02em;
}
.grand__num small { font-family: var(--font-display); font-size: 28px; font-weight: 500; }
.grand__cmp {
  font-family: var(--font-display);
  font-size: 14.5px;
  line-height: 1.95;
  color: rgba(248, 241, 225, 0.85);
  margin: 0;
}
.grand__cmp b { color: var(--c-gold-bright); font-weight: 600; }
.grand__table {
  padding: 36px 44px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: rgba(101, 50, 36, 0.18);
}
.grand__tr {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(212, 175, 106, 0.2);
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.05em;
  color: rgba(248, 241, 225, 0.9);
}
.grand__tr--head {
  color: var(--c-gold-bright);
  font-size: 12px;
  letter-spacing: 0.2em;
  border-bottom-color: rgba(212, 175, 106, 0.5);
}
.grand__tr span:nth-child(2), .grand__tr span:nth-child(3) { font-family: var(--font-num); font-size: 16px; }
.grand__tr--head span:nth-child(2), .grand__tr--head span:nth-child(3) { font-family: var(--font-display); font-size: 12px; }
.grand__tr--total {
  border-bottom: none;
  color: var(--c-gold-bright);
  font-weight: 600;
  border-top: 1px solid var(--c-gold-bright);
  margin-top: 4px;
  padding-top: 16px;
}

.source__vow {
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.2vw, 28px);
  line-height: 1.8;
  color: var(--c-ink);
  letter-spacing: 0.04em;
}
.source__vow em { color: var(--c-red); font-weight: 700; }


/* ============================================================
   Prologue
   ============================================================ */
.prologue {
  padding: 80px 48px;
  text-align: center;
  background: var(--c-bg);
}
.prologue__rule {
  width: 200px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-gold), transparent);
  margin: 0 auto 36px;
  position: relative;
}
.prologue__rule::after {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%) rotate(45deg);
  width: 8px; height: 8px;
  background: var(--c-gold-bright);
}
.prologue__rule:last-child { margin: 36px auto 0; }
.prologue__cn {
  font-family: var(--font-display);
  font-size: clamp(20px, 2vw, 26px);
  line-height: 2.1;
  letter-spacing: 0.12em;
  margin: 0 0 16px;
  color: var(--c-ink);
}
.prologue__cn em {
  font-family: var(--font-num);
  color: var(--c-red);
  font-size: 1.4em;
  padding: 0 4px;
}
.prologue__quote {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.2vw, 42px);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--c-red);
  margin: 0 0 28px;
  line-height: 1.5;
}
.prologue__by {
  font-family: var(--font-display);
  font-size: 15px;
  letter-spacing: 0.3em;
  color: var(--c-camel-deep);
  margin: 22px 0 0;
}
.prologue__en {
  font-family: var(--font-en);
  font-size: 13px;
  letter-spacing: 0.45em;
  color: var(--c-gold);
  margin: 0;
}


/* ============================================================
   Origin
   ============================================================ */
.origin__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  max-width: 1300px;
  margin: 0 auto 100px;
}

.origin__bullets {
  display: grid;
  gap: 22px;
  margin: 40px 0 0;
}
.origin__bullets li {
  display: grid;
  grid-template-columns: 50px 1fr;
  gap: 18px;
  padding: 18px 22px;
  background: rgba(255, 255, 255, 0.5);
  border-left: 2px solid var(--c-red);
  font-size: 15px;
  line-height: 1.75;
}
.origin__bullet-num {
  font-family: var(--font-num);
  font-size: 32px;
  color: var(--c-red);
  line-height: 1;
}
.origin__bullets b { color: var(--c-ink); font-weight: 600; }

.origin__art { position: relative; display: flex; flex-direction: column; align-items: center; gap: 48px; }
.origin__circle {
  position: relative;
  width: 480px; height: 480px;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(circle, #faf3e3 0%, #e8d5b7 70%, transparent 100%);
  border-radius: 50%;
}
.origin__circle-ring,
.origin__circle-ring--2 {
  position: absolute;
  inset: 24px;
  border-radius: 50%;
  border: 1px solid var(--c-gold);
  pointer-events: none;
}
.origin__circle-ring::before {
  content: '';
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  border: 1px dashed var(--c-gold);
  opacity: 0.5;
  animation: ringSpin 90s linear infinite;
}
.origin__circle-ring--2 { inset: 60px; border-color: rgba(184, 146, 75, 0.4); }
@keyframes ringSpin { to { transform: rotate(360deg); } }
.origin__camel { width: 80%; height: auto; position: relative; z-index: 1; }
.origin__circle-stamp {
  position: absolute;
  right: 6%;
  top: 12%;
  width: 64px; height: 80px;
  background: var(--c-red);
  color: var(--c-gold-bright);
  font-family: var(--font-brush);
  font-size: 22px;
  letter-spacing: 0;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  border: 2px solid var(--c-gold-bright);
  outline: 1px solid var(--c-red);
  outline-offset: 4px;
  line-height: 1.2;
  box-shadow: 0 8px 20px -4px rgba(179, 50, 42, 0.5);
  writing-mode: vertical-rl;
  transform: rotate(-4deg);
}

.origin__numbers { text-align: center; }
.origin__big-num {
  display: inline-flex;
  align-items: baseline;
  gap: 12px;
}
.origin__big-num-val {
  font-family: var(--font-num);
  font-size: 140px;
  font-weight: 400;
  color: var(--c-red);
  line-height: 0.9;
  letter-spacing: -0.02em;
}
.origin__big-num-unit {
  font-family: var(--font-display);
  font-size: 28px;
  color: var(--c-ink);
  font-weight: 500;
}
.origin__big-num-unit small { font-size: 14px; color: var(--c-ink-soft); margin-left: 4px; }
.origin__big-num-cap {
  font-family: var(--font-display);
  font-size: 15px;
  letter-spacing: 0.25em;
  color: var(--c-ink-soft);
  margin: 16px 0 0;
}


/* ---------- Scarcity row ---------- */
.scarcity {
  max-width: 1300px;
  margin: 0 auto;
  background:
    linear-gradient(135deg, var(--c-red) 0%, var(--c-red-deep) 100%);
  color: var(--c-paper);
  padding: 56px 56px 60px;
  position: relative;
  box-shadow: var(--shadow-md);
}
.scarcity::before {
  content: '';
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(212, 175, 106, 0.55);
  pointer-events: none;
}
.scarcity::after {
  content: '';
  position: absolute;
  inset: 14px;
  border: 1px dotted rgba(212, 175, 106, 0.3);
  pointer-events: none;
}
.scarcity__head {
  display: flex;
  align-items: baseline;
  gap: 24px;
  margin-bottom: 40px;
  border-bottom: 1px solid rgba(212, 175, 106, 0.35);
  padding-bottom: 24px;
}
.scarcity__head-cn {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.3em;
  color: var(--c-gold-bright);
}
.scarcity__head-en {
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.4em;
  color: rgba(212, 175, 106, 0.65);
  margin-left: auto;
}
.scarcity__row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
}
.scarcity__cell { text-align: center; }
.scarcity__big {
  font-family: var(--font-num);
  font-size: 76px;
  color: var(--c-gold-bright);
  line-height: 1;
  margin-bottom: 16px;
}
.scarcity__big small {
  font-family: var(--font-display);
  font-size: 22px;
  color: var(--c-paper);
  margin-left: 4px;
  font-weight: 500;
}
.scarcity__cell p {
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.15em;
  line-height: 1.9;
  color: rgba(248, 241, 225, 0.85);
  margin: 0;
}


/* ============================================================
   Heritage / Timeline
   ============================================================ */
.section--heritage { background: linear-gradient(180deg, var(--c-bg) 0%, var(--c-bg-2) 100%); }
.heritage__head { text-align: center; margin-bottom: 80px; max-width: 1300px; margin-left: auto; margin-right: auto; }

.timeline {
  position: relative;
  max-width: 1300px;
  margin: 0 auto;
  padding: 0 60px;
}
.timeline::before {
  content: '';
  position: absolute;
  top: 50%; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--c-gold) 10%, var(--c-gold) 90%, transparent);
  transform: translateY(-50%);
}
.timeline {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 24px;
}
.timeline__item {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 60px 0;
}
.timeline__item:nth-child(even) { flex-direction: column-reverse; }
.timeline__item:nth-child(even) .timeline__card { margin-top: 0; margin-bottom: 24px; }
.timeline__year {
  font-family: var(--font-num);
  font-size: 32px;
  color: var(--c-red);
  margin: 0;
}
.timeline__dot {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--c-red);
  outline: 2px solid var(--c-gold-bright);
  outline-offset: 3px;
  box-shadow: 0 0 0 6px var(--c-bg-2);
  z-index: 2;
}
.timeline__item--current .timeline__dot {
  background: var(--c-gold-bright);
  outline-color: var(--c-red);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 6px var(--c-bg-2), 0 0 0 6px var(--c-bg-2); }
  50%      { box-shadow: 0 0 0 6px var(--c-bg-2), 0 0 0 14px rgba(212,175,106,0.35); }
}
.timeline__card {
  background: var(--c-paper);
  border: 1px solid rgba(184, 146, 75, 0.3);
  padding: 18px 16px;
  text-align: center;
  margin-top: 24px;
  position: relative;
  box-shadow: var(--shadow-sm);
}
.timeline__card h4 {
  font-family: var(--font-display);
  margin: 0 0 6px;
  font-size: 16px;
  letter-spacing: 0.15em;
  color: var(--c-red-deep);
  font-weight: 600;
}
.timeline__card p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-ink-soft);
}


/* ============================================================
   Structure / Fiber
   ============================================================ */
.section--structure {
  background:
    radial-gradient(ellipse at 30% 20%, rgba(179, 50, 42, 0.18) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(212, 175, 106, 0.12) 0%, transparent 50%),
    var(--c-bg-deep);
  padding: 160px 48px;
}
.structure__head { text-align: center; max-width: 900px; margin: 0 auto 80px; }

.fiber {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  max-width: 1300px;
  margin: 0 auto 120px;
  align-items: center;
}
.fiber__viz {
  position: relative;
  aspect-ratio: 1 / 1;
  display: flex; align-items: center; justify-content: center;
}
.fiber__svg {
  width: 100%; height: 100%;
  filter: drop-shadow(0 30px 60px rgba(212, 175, 106, 0.15));
}
[data-hollow-anim="true"] .fiber__scales circle {
  animation: scaleRipple 8s ease-in-out infinite;
}
.fiber__scales circle:nth-child(1) { animation-delay: 0s; }
.fiber__scales circle:nth-child(2) { animation-delay: 0.4s; }
.fiber__scales circle:nth-child(3) { animation-delay: 0.8s; }
.fiber__scales circle:nth-child(4) { animation-delay: 1.2s; }
@keyframes scaleRipple {
  0%, 100% { opacity: 0.4; }
  50%      { opacity: 0.85; }
}
[data-hollow-anim="true"] .fiber__air circle {
  animation: airFloat 5s ease-in-out infinite;
}
.fiber__air circle:nth-child(2) { animation-delay: 0.5s; }
.fiber__air circle:nth-child(3) { animation-delay: 1s; }
.fiber__air circle:nth-child(4) { animation-delay: 1.5s; }
.fiber__air circle:nth-child(5) { animation-delay: 2s; }
.fiber__air circle:nth-child(6) { animation-delay: 2.5s; }
@keyframes airFloat {
  0%, 100% { transform: translate(0, 0); }
  50%      { transform: translate(4px, -6px); }
}

.fiber__hot {
  position: absolute;
  transform: translate(-50%, -50%);
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 4;
}
.fiber__hot-dot {
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--c-red);
  outline: 2px solid var(--c-gold-bright);
  outline-offset: 3px;
  position: relative;
}
.fiber__hot-dot::after {
  content: '';
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  border: 1px solid var(--c-gold-bright);
  animation: pulse2 2s ease-in-out infinite;
}
@keyframes pulse2 {
  0%, 100% { transform: scale(1); opacity: 0.8; }
  50%      { transform: scale(1.6); opacity: 0; }
}
.fiber__hot-label {
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.2em;
  padding: 4px 10px;
  background: rgba(212, 175, 106, 0.95);
  color: var(--c-bg-deep);
  border-radius: 2px;
  white-space: nowrap;
}

.fiber__panel { padding: 8px 0; }
.fiber__tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid rgba(212, 175, 106, 0.3);
  margin-bottom: 28px;
}
.fiber__tab {
  padding: 14px 18px;
  font-family: var(--font-display);
  font-size: 15px;
  letter-spacing: 0.2em;
  color: rgba(248, 241, 225, 0.55);
  border-bottom: 2px solid transparent;
  transition: all 0.25s;
}
.fiber__tab:hover { color: var(--c-gold-bright); }
.fiber__tab.is-active { color: var(--c-gold-bright); border-bottom-color: var(--c-gold-bright); }

.fiber__pane { display: none; }
.fiber__pane.is-active { display: block; animation: fadeUp 0.5s ease; }
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}
.fiber__pane-en {
  display: block;
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.4em;
  color: var(--c-gold);
  margin-bottom: 8px;
}
.fiber__pane h3 {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 600;
  letter-spacing: 0.06em;
  margin: 0 0 18px;
  color: var(--c-paper);
}
.fiber__pane p {
  font-size: 16px;
  line-height: 2;
  color: rgba(248, 241, 225, 0.78);
  margin: 0 0 24px;
}
.fiber__pane strong { color: var(--c-gold-bright); }
.fiber__pane em { color: var(--c-red-soft); font-weight: 500; }
.fiber__pane ul {
  border-top: 1px solid rgba(212, 175, 106, 0.2);
  padding-top: 18px;
  display: grid;
  gap: 12px;
}
.fiber__pane ul li {
  display: flex;
  justify-content: space-between;
  font-size: 14px;
  font-family: var(--font-display);
  color: rgba(248, 241, 225, 0.7);
}
.fiber__pane ul li b {
  color: var(--c-gold-bright);
  font-family: var(--font-num);
  font-size: 18px;
  font-weight: 400;
  letter-spacing: 0.05em;
}

/* virtues */
.virtues {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  max-width: 1300px;
  margin: 0 auto;
}
.virtue {
  text-align: center;
  padding: 40px 24px;
  background: rgba(212, 175, 106, 0.06);
  border: 1px solid rgba(212, 175, 106, 0.2);
  position: relative;
  transition: all 0.4s;
}
.virtue::before, .virtue::after {
  content: '';
  position: absolute;
  width: 14px; height: 14px;
  border: 1px solid var(--c-gold-bright);
}
.virtue::before { top: 6px; left: 6px; border-right: none; border-bottom: none; }
.virtue::after { bottom: 6px; right: 6px; border-left: none; border-top: none; }
.virtue:hover {
  background: rgba(212, 175, 106, 0.12);
  transform: translateY(-4px);
}
.virtue__seal {
  display: inline-flex;
  align-items: center; justify-content: center;
  width: 64px; height: 64px;
  background: var(--c-red);
  color: var(--c-gold-bright);
  font-family: var(--font-brush);
  font-size: 36px;
  margin-bottom: 20px;
  border: 1.5px solid var(--c-gold-bright);
  outline: 1px solid var(--c-red);
  outline-offset: 3px;
}
.virtue h4 {
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: 0.25em;
  margin: 0 0 12px;
  color: var(--c-paper);
}
.virtue p {
  font-size: 13px;
  line-height: 1.9;
  letter-spacing: 0.1em;
  color: rgba(248, 241, 225, 0.7);
  margin: 0;
}


/* ============================================================
   Authenticity / Compare slider
   ============================================================ */
.section--auth { background: var(--c-bg-2); }
.auth__head { text-align: left; max-width: 900px; margin: 0 0 60px 100px; }

.compare {
  max-width: 1300px;
  margin: 0 auto 100px;
  text-align: center;
}
.compare__viewport {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  user-select: none;
  cursor: ew-resize;
  box-shadow: var(--shadow-lg);
  background: #000;
}
.compare__pane {
  position: absolute;
  inset: 0;
  overflow: hidden;
}
.compare__pane img {
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
}
.compare__pane--fake .compare__fake-bg {
  position: absolute; inset: 0;
}
.compare__pane--fake .compare__fake-bg img {
  width: 100%; height: 100%;
  object-fit: cover;
  filter: grayscale(0.55) brightness(1.18) contrast(0.85) saturate(0.5) hue-rotate(-12deg);
}
.compare__pane--fake::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(45deg, rgba(255,255,255,0.04) 0 2px, transparent 2px 6px);
}
.compare__pane--real {
  clip-path: inset(0 0 0 50%);
}

.compare__tag {
  position: absolute;
  top: 28px;
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 14px 22px;
  font-family: var(--font-display);
  background: rgba(101, 50, 36, 0.92);
  color: var(--c-paper);
  box-shadow: var(--shadow-md);
}
.compare__tag-no {
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.45em;
  opacity: 0.75;
  margin-bottom: 4px;
}
.compare__tag-cn { font-size: 18px; letter-spacing: 0.18em; }
.compare__tag--fake { left: 28px; border-left: 3px solid #888; }
.compare__tag--real {
  right: 28px;
  background: var(--c-red);
  border-right: 3px solid var(--c-gold-bright);
}
.compare__tag--real .compare__tag-no { color: var(--c-gold-bright); }

.compare__notes {
  position: absolute;
  bottom: 28px;
  display: flex; flex-direction: column; gap: 10px;
  padding: 18px 22px;
  background: rgba(101, 50, 36, 0.88);
  color: var(--c-paper);
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.1em;
  backdrop-filter: blur(8px);
}
.compare__notes li { display: flex; align-items: center; gap: 10px; }
.compare__notes-dot {
  width: 22px; height: 22px;
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 600;
  border-radius: 50%;
  font-size: 14px;
}
.compare__notes--fake { left: 28px; }
.compare__notes--fake .compare__notes-dot { background: #555; color: #fff; }
.compare__notes--real { right: 28px; background: rgba(125, 31, 26, 0.92); }
.compare__notes--real .compare__notes-dot { background: var(--c-gold-bright); color: var(--c-red-deep); }

.compare__handle {
  position: absolute;
  top: 0; bottom: 0;
  left: 50%;
  width: 2px;
  background: var(--c-gold-bright);
  transform: translateX(-50%);
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  pointer-events: none;
}
.compare__handle-line {
  flex: 1;
  width: 2px;
  background: var(--c-gold-bright);
  box-shadow: 0 0 12px rgba(212, 175, 106, 0.8);
}
.compare__handle-grip {
  width: 56px; height: 56px;
  border-radius: 50%;
  background: var(--c-red);
  border: 2px solid var(--c-gold-bright);
  color: var(--c-gold-bright);
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 8px 24px -4px rgba(179, 50, 42, 0.5),
              inset 0 0 0 4px var(--c-red);
  pointer-events: all;
  cursor: ew-resize;
}

.compare__hint {
  margin: 20px 0 0;
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.25em;
  color: var(--c-ink-soft);
}


/* 三大鉴别法 */
.auth__methods {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 1300px;
  margin: 0 auto 60px;
}
.auth__method {
  padding: 36px 32px;
  background: var(--c-paper);
  border-top: 3px solid var(--c-red);
  position: relative;
  box-shadow: var(--shadow-sm);
  transition: all 0.35s;
}
.auth__method:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.auth__method-no {
  display: inline-block;
  font-family: var(--font-brush);
  font-size: 40px;
  color: var(--c-red);
  margin-bottom: 12px;
}
.auth__method h4 {
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: 0.2em;
  margin: 0 0 14px;
  color: var(--c-ink);
}
.auth__method p {
  margin: 0;
  font-size: 14.5px;
  line-height: 2;
  color: var(--c-ink-soft);
}
.auth__method strong { color: var(--c-red); font-weight: 600; }
.auth__method em { color: var(--c-camel-deep); font-style: italic; }

.auth__promise {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 24px 36px;
  background: var(--c-ink);
  color: var(--c-paper);
  font-family: var(--font-display);
  font-size: 16px;
  letter-spacing: 0.15em;
  border: 1px solid var(--c-gold);
  outline: 1px solid var(--c-ink);
  outline-offset: 4px;
}
.auth__promise-mark {
  flex-shrink: 0;
  width: 56px; height: 56px;
  background: var(--c-red);
  color: var(--c-gold-bright);
  font-family: var(--font-brush);
  font-size: 22px;
  display: flex; align-items: center; justify-content: center;
  border: 1.5px solid var(--c-gold-bright);
  letter-spacing: 0;
  line-height: 1.1;
  text-align: center;
}
.auth__promise p { margin: 0; }
.auth__promise strong { color: var(--c-gold-bright); }


/* ============================================================
   Products
   ============================================================ */
.section--products {
  background:
    radial-gradient(ellipse at 50% 0%, rgba(179, 50, 42, 0.15) 0%, transparent 50%),
    var(--c-bg-deep);
  padding-bottom: 100px;
}
.products__head { text-align: center; max-width: 900px; margin: 0 auto 80px; }

.products__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: auto auto;
  gap: 28px;
  max-width: 1400px;
  margin: 0 auto 100px;
}
.product {
  background: rgba(248, 241, 225, 0.04);
  border: 1px solid rgba(212, 175, 106, 0.18);
  overflow: hidden;
  transition: all 0.4s;
}
.product:hover {
  border-color: rgba(212, 175, 106, 0.5);
  transform: translateY(-6px);
  box-shadow: 0 30px 60px -20px rgba(0, 0, 0, 0.5);
}
.product--hero {
  grid-column: 1 / span 2;
  grid-row: 1 / span 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
}
.product__img {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: #2a1610;
}
.product__img img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.8s ease;
}
.product:hover .product__img img { transform: scale(1.05); }
.product--hero .product__img,
.product__img--cover {
  aspect-ratio: unset;
  height: 100%;
}
.product__badge {
  position: absolute;
  top: 20px; left: 20px;
  background: var(--c-red);
  color: var(--c-gold-bright);
  padding: 6px 14px;
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.25em;
  border: 1px solid var(--c-gold-bright);
}
.product__body { padding: 28px 30px 30px; color: var(--c-paper); }
.product--hero .product__body { padding: 48px; display: flex; flex-direction: column; justify-content: center; }
.product__series {
  display: block;
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.4em;
  color: var(--c-gold);
  margin-bottom: 10px;
}
.product__name {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.15em;
  margin: 0 0 12px;
  color: var(--c-paper);
}
.product--hero .product__name { font-size: 32px; }
.product__desc {
  font-size: 14px;
  line-height: 1.9;
  color: rgba(248, 241, 225, 0.68);
  margin: 0 0 14px;
}
.product--hero .product__desc { font-size: 16px; }
.product__meta {
  display: flex;
  gap: 24px;
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid rgba(212, 175, 106, 0.2);
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: rgba(248, 241, 225, 0.6);
}
.product__meta b { color: var(--c-gold-bright); font-family: var(--font-num); font-size: 18px; font-weight: 400; margin-left: 6px; }

.texture {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 40px;
  align-items: stretch;
  background: rgba(212, 175, 106, 0.06);
  border: 1px solid rgba(212, 175, 106, 0.18);
}
.texture__caption {
  padding: 60px 50px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  color: var(--c-paper);
}
.texture__caption-en {
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.4em;
  color: var(--c-gold);
  margin-bottom: 14px;
}
.texture__caption h3 {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 600;
  letter-spacing: 0.1em;
  margin: 0 0 18px;
}
.texture__caption p {
  font-size: 15px;
  line-height: 2;
  color: rgba(248, 241, 225, 0.72);
  margin: 0;
}
.texture__img { overflow: hidden; min-height: 380px; }
.texture__img img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 1.2s ease;
}
.texture:hover .texture__img img { transform: scale(1.04); }


/* ============================================================
   Promise / 礼盒承诺
   ============================================================ */
.promise {
  background: var(--c-bg);
  padding: 100px 48px;
}
.promise__inner {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--c-gold);
  border-bottom: 1px solid var(--c-gold);
}
.promise__col {
  padding: 50px 36px;
  text-align: center;
  border-right: 1px solid rgba(184, 146, 75, 0.3);
  transition: background 0.3s;
}
.promise__col:last-child { border-right: none; }
.promise__col:hover { background: rgba(212, 175, 106, 0.08); }
.promise__num {
  display: block;
  font-family: var(--font-num);
  font-size: 36px;
  color: var(--c-red);
  margin-bottom: 14px;
}
.promise__col h4 {
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: 0.25em;
  margin: 0 0 14px;
  color: var(--c-ink);
}
.promise__col p {
  font-size: 14px;
  line-height: 1.95;
  color: var(--c-ink-soft);
  margin: 0;
}


/* ============================================================
   Contact
   ============================================================ */
.section--contact { background: linear-gradient(180deg, var(--c-bg) 0%, var(--c-bg-2) 100%); }
.contact {
  max-width: 1300px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.contact__list { margin: 36px 0 36px; display: grid; gap: 22px; }
.contact__list li { display: grid; grid-template-columns: 48px 1fr; gap: 16px; align-items: center; }
.contact__icon {
  width: 48px; height: 48px;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--c-red);
  color: var(--c-gold-bright);
  border: 1px solid var(--c-gold-bright);
}
.contact__list .contact__label {
  display: block;
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.35em;
  color: var(--c-gold);
  margin-bottom: 2px;
  text-transform: uppercase;
}
.contact__list .contact__val {
  display: block;
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: 0.1em;
  color: var(--c-ink);
}

/* QR card */
.qr-card {
  position: relative;
  background: var(--c-paper);
  padding: 48px 40px 36px;
  text-align: center;
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(184, 146, 75, 0.4);
}
.qr-card__corner {
  position: absolute;
  width: 22px; height: 22px;
  border: 2px solid var(--c-red);
}
.qr-card__corner--tl { top: 10px; left: 10px; border-right: none; border-bottom: none; }
.qr-card__corner--tr { top: 10px; right: 10px; border-left: none; border-bottom: none; }
.qr-card__corner--bl { bottom: 10px; left: 10px; border-right: none; border-top: none; }
.qr-card__corner--br { bottom: 10px; right: 10px; border-left: none; border-top: none; }
.qr-card__top img {
  width: 56px;
  margin: 0 auto 12px;
  filter: drop-shadow(0 4px 10px rgba(179, 50, 42, 0.3));
}
.qr-card__title {
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: 0.25em;
  margin: 0 0 6px;
  color: var(--c-red-deep);
  font-weight: 600;
}
.qr-card__sub {
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.4em;
  color: var(--c-gold);
  margin: 0 0 28px;
}
.qr-card__qr {
  position: relative;
  width: 240px; height: 240px;
  margin: 0 auto 24px;
  background: #fff;
  padding: 14px;
  box-shadow: inset 0 0 0 1px var(--c-gold-bright);
}
.qr-card__qr img { width: 100%; height: 100%; object-fit: contain; }
.qr-card__qr::before, .qr-card__qr::after {
  content: '';
  position: absolute;
  width: 18px; height: 18px;
  border: 2px solid var(--c-red);
}
.qr-card__qr::before { top: -4px; left: -4px; border-right: none; border-bottom: none; }
.qr-card__qr::after  { bottom: -4px; right: -4px; border-left: none; border-top: none; }
.qr-card__id { margin: 0 0 4px; font-size: 15px; letter-spacing: 0.15em; color: var(--c-ink); }
.qr-card__id b { color: var(--c-red); font-family: var(--font-num); font-size: 20px; font-weight: 400; margin-left: 4px; }
.qr-card__note {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.25em;
  color: var(--c-ink-soft);
  opacity: 0.75;
}


/* ============================================================
   Footer
   ============================================================ */
.footer {
  background: var(--c-bg-deep);
  color: var(--c-paper);
  padding: 70px 48px 30px;
}
.footer__top {
  max-width: 1400px;
  margin: 0 auto 50px;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 60px;
  align-items: start;
}
.footer__brand { display: flex; gap: 18px; align-items: flex-start; }
.footer__logo { width: 54px; height: auto; filter: drop-shadow(0 4px 10px rgba(179, 50, 42, 0.3)); }
.footer__name-zh {
  display: block;
  font-family: var(--font-display);
  font-size: 24px;
  letter-spacing: 0.3em;
  color: var(--c-paper);
  font-weight: 600;
}
.footer__name-en {
  display: block;
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.35em;
  color: var(--c-gold);
  margin-top: 4px;
}
.footer__motto {
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.2em;
  color: rgba(248, 241, 225, 0.55);
  margin: 14px 0 0;
}

.footer__cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}
.footer__col h5 {
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.3em;
  margin: 0 0 16px;
  color: var(--c-gold-bright);
}
.footer__col a {
  display: block;
  padding: 4px 0;
  font-size: 13px;
  letter-spacing: 0.15em;
  color: rgba(248, 241, 225, 0.6);
  transition: color 0.2s;
}
.footer__col a:hover { color: var(--c-gold-bright); }

.footer__bottom {
  max-width: 1400px;
  margin: 0 auto;
  padding-top: 24px;
  border-top: 1px solid rgba(212, 175, 106, 0.2);
  display: flex;
  justify-content: space-between;
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: rgba(248, 241, 225, 0.4);
}


/* ============================================================
   QR Modal
   ============================================================ */
.qr-modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex; align-items: center; justify-content: center;
  animation: modalIn 0.3s ease;
}
.qr-modal[hidden] { display: none; }
@keyframes modalIn { from { opacity: 0; } to { opacity: 1; } }
.qr-modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(101, 50, 36, 0.7);
  backdrop-filter: blur(8px);
}
.qr-modal__dialog {
  position: relative;
  width: min(440px, 92vw);
  background: var(--c-paper);
  padding: 56px 40px 36px;
  text-align: center;
  box-shadow: 0 40px 100px -20px rgba(0, 0, 0, 0.6);
  border: 1px solid var(--c-gold);
  animation: modalUp 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.qr-modal__dialog::before {
  content: '';
  position: absolute;
  inset: 8px;
  border: 1px dotted rgba(184, 146, 75, 0.4);
  pointer-events: none;
}
@keyframes modalUp {
  from { transform: translateY(20px) scale(0.96); opacity: 0; }
  to   { transform: translateY(0) scale(1); opacity: 1; }
}
.qr-modal__close {
  position: absolute;
  top: 12px; right: 16px;
  width: 36px; height: 36px;
  border-radius: 50%;
  font-size: 24px;
  color: var(--c-ink-soft);
  transition: all 0.25s;
  z-index: 2;
}
.qr-modal__close:hover { background: var(--c-red); color: var(--c-paper); }
.qr-modal__seal img {
  width: 64px;
  margin: 0 auto 16px;
  filter: drop-shadow(0 4px 12px rgba(179, 50, 42, 0.3));
}
.qr-modal__title {
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: 0.2em;
  margin: 0 0 6px;
  color: var(--c-red-deep);
  font-weight: 600;
}
.qr-modal__sub {
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: 0.4em;
  color: var(--c-gold);
  margin: 0 0 26px;
}
.qr-modal__qr {
  width: 240px; height: 240px;
  margin: 0 auto 26px;
  padding: 14px;
  background: #fff;
  box-shadow: inset 0 0 0 1px var(--c-gold-bright);
}
.qr-modal__qr img { width: 100%; height: 100%; object-fit: contain; }
.qr-modal__info {
  display: grid;
  gap: 8px;
  margin: 0 0 18px;
  padding: 16px 24px;
  background: rgba(184, 146, 75, 0.1);
  border: 1px dashed rgba(184, 146, 75, 0.4);
}
.qr-modal__info li {
  display: flex; justify-content: space-between;
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.1em;
}
.qr-modal__info span { color: var(--c-ink-soft); }
.qr-modal__info b { color: var(--c-red); font-weight: 600; font-family: var(--font-num); font-size: 16px; letter-spacing: 0.05em; }
.qr-modal__hint {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--c-ink-soft);
  opacity: 0.7;
}


/* ============================================================
   Reveal-on-scroll
   ============================================================ */
.reveal { opacity: 0; transform: translateY(28px); transition: all 1s cubic-bezier(0.16, 1, 0.3, 1); }
.reveal.is-in { opacity: 1; transform: translateY(0); }


/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1100px) {
  .nav__links { display: none; }
  .hero__inner { grid-template-columns: 1fr; gap: 24px; padding-top: 130px; padding-bottom: 220px; }
  .hero__rail { display: none; }
  .hero__stats { padding: 18px 24px; flex-wrap: wrap; gap: 20px; }
  .hero__stat-div { display: none; }
  .hero__stat-num { font-size: 32px; }
  .origin__grid { grid-template-columns: 1fr; gap: 40px; }
  .origin__circle { width: 360px; height: 360px; }
  .origin__big-num-val { font-size: 100px; }
  .scarcity__row { grid-template-columns: repeat(2, 1fr); gap: 28px; }
  .fiber-cmp__row { grid-template-columns: 1.2fr 1fr; }
  .fiber-cmp__row > .fiber-cmp__bar { grid-column: 1 / -1; }
  .fiber-cmp__row--head span:last-child { display: none; }
  .regions { grid-template-columns: 1fr; }
  .grand { grid-template-columns: 1fr; }
  .timeline { grid-template-columns: 1fr; padding: 0 20px; }
  .timeline::before { left: 50%; right: auto; top: 0; bottom: 0; width: 2px; height: 100%; background: linear-gradient(180deg, transparent, var(--c-gold) 10%, var(--c-gold) 90%, transparent); }
  .timeline__item { padding: 24px 0; }
  .fiber { grid-template-columns: 1fr; gap: 40px; }
  .virtues { grid-template-columns: repeat(2, 1fr); }
  .auth__methods { grid-template-columns: 1fr; }
  .products__grid { grid-template-columns: 1fr 1fr; }
  .product--hero { grid-column: 1 / -1; grid-template-columns: 1fr; }
  .texture { grid-template-columns: 1fr; }
  .promise__inner { grid-template-columns: repeat(2, 1fr); }
  .promise__col:nth-child(2) { border-right: none; }
  .contact { grid-template-columns: 1fr; }
  .footer__top { grid-template-columns: 1fr; }
}

@media (max-width: 680px) {
  .nav, .hero, .section, .prologue, .promise, .footer { padding-left: 24px; padding-right: 24px; }
  .section { padding-top: 100px; padding-bottom: 80px; }
  .auth__head { margin-left: 0; }
  .virtues { grid-template-columns: 1fr 1fr; }
  .products__grid { grid-template-columns: 1fr; }
  .promise__inner { grid-template-columns: 1fr; }
  .promise__col { border-right: none; border-bottom: 1px solid rgba(184, 146, 75, 0.3); }
  .promise__col:last-child { border-bottom: none; }
  .scarcity__row { grid-template-columns: 1fr 1fr; }
  .footer__cols { grid-template-columns: 1fr 1fr; }
  .footer__bottom { flex-direction: column; gap: 8px; text-align: center; }
}


/* ============================================================
   OVERRIDES — 顶部菜单 3x · 圆角矩形
   ============================================================ */
.nav__links { font-size: 16px; gap: 34px; }

/* 圆角矩形 — 所有主要方块组件 */
.nav.is-scrolled { border-radius: 0 0 18px 18px; }
.nav__cta { border-radius: 16px; }
.btn { border-radius: 14px; }
.btn--primary::before { border-radius: 11px; }
.hero__stats { border-radius: 22px 22px 0 0; }
.section__chapter-no { border-radius: 14px; }
.origin__bullets li { border-radius: 4px 14px 14px 4px; }
.origin__circle-stamp { border-radius: 8px; }
.scarcity { border-radius: 24px; }
.scarcity::before { border-radius: 18px; }
.scarcity::after { border-radius: 14px; }
.timeline__card { border-radius: 14px; }
.fiber-cmp { border-radius: 20px; overflow: hidden; }
.fiber__hot-label { border-radius: 8px; }
.fiber__info { border-radius: 16px; }
.virtue { border-radius: 18px; }
.virtue__seal { border-radius: 14px; }
.auth__method { border-radius: 16px; }
.auth__promise { border-radius: 18px; }
.auth__promise-mark { border-radius: 12px; }
.compare__viewport { border-radius: 22px; }
.compare__tag { border-radius: 10px; }
.compare__notes { border-radius: 12px; }
.region { border-radius: 18px; }
.region__neck { border-radius: 10px; }
.grand { border-radius: 24px; }
.grand::before { border-radius: 18px; }
.product { border-radius: 20px; }
.product__badge { border-radius: 8px; }
.texture { border-radius: 20px; overflow: hidden; }
.promise__inner { border-radius: 20px; overflow: hidden; }
.qr-card { border-radius: 22px; }
.qr-card__qr { border-radius: 12px; }
.contact__icon { border-radius: 12px; }
.qr-modal__dialog { border-radius: 24px; }
.qr-modal__dialog::before { border-radius: 18px; }
.qr-modal__qr { border-radius: 12px; }
.qr-modal__close { border-radius: 50%; }
.qr-modal__info { border-radius: 12px; }


/* ============================================================
   COMMENT FIXES
   ============================================================ */

/* [4fe450e1a8] 时间轴圆点遮挡 — 给年份与卡片留出中央净空带，圆点居中不压字 */
.timeline__item {
  min-height: 300px;
  padding: 18px 0;
  justify-content: space-between;
}
.timeline__item, .timeline__item:nth-child(even) { }
.timeline__card { margin-top: 0 !important; margin-bottom: 0 !important; }
.timeline__year { margin: 0; }
.timeline__dot {
  /* 实心底色环遮住背后连线，确保圆点干净悬于净空带 */
  box-shadow: 0 0 0 7px var(--c-bg-2);
}

/* [7fff80f7cf] 产区卡片本地符号线描图 */
.region__head { position: relative; }
.region__symbol {
  position: absolute;
  top: -6px;
  right: -4px;
  width: 78px;
  height: 60px;
  color: var(--c-camel-deep);
  opacity: 0.5;
  pointer-events: none;
}
.region__symbol svg { width: 100%; height: 100%; }
.region:hover .region__symbol { opacity: 0.8; color: var(--c-red); transition: all 0.4s; }
.region__no, .region__name, .region__tag { position: relative; z-index: 1; }

/* [09238d70db] 鉴别法卡片图标填充空白 */
.auth__method { position: relative; }
.auth__method-ico {
  position: absolute;
  top: 28px;
  right: 28px;
  width: 56px;
  height: 56px;
  color: var(--c-red);
  opacity: 0.85;
}
.auth__method-ico svg { width: 100%; height: 100%; }
.auth__method-no { position: relative; z-index: 1; }
@media (max-width: 680px) {
  .auth__method-ico { width: 46px; height: 46px; top: 22px; right: 22px; }
}

/* [e4e4a98d49] 旗舰产品改为上下排版 */
.product--hero {
  grid-template-columns: 1fr;
  grid-template-rows: auto auto;
}
.product--hero .product__img,
.product--hero .product__img--cover {
  aspect-ratio: 16 / 9;
  height: auto;
}
.product--hero .product__body {
  padding: 36px 44px 40px;
}