/* ==========================================================================
   MULAN TEA STORY — Global Tea Supply Chain Group
   Palette: Deep Forest Green #0F2D23 | Tea Gold #B08D57 | Ivory White #F7F5EF
   2026 升级版本：杂志级排版 · 极简高级感 · 优雅流程 · 简约动态
   ========================================================================== */

:root {
  --green: #0F2D23;
  --green-2: #14382C;
  --green-3: #1B4A38;
  --gold: #B08D57;
  --gold-2: #C9A36B;
  --gold-light: #E6D5B0;
  --gold-dark: #8C6F3F;
  --ivory: #F7F5EF;
  --ivory-2: #EFEBDF;
  --ink: #1A1A1A;
  --ink-2: #4A4A4A;
  --ink-3: #8A8A8A;
  --line: rgba(15, 45, 35, .12);
  --line-soft: rgba(15, 45, 35, .06);
  --white: #FFFFFF;

  --shadow-sm: 0 2px 12px rgba(15, 45, 35, .06);
  --shadow-md: 0 20px 60px rgba(15, 45, 35, .12);
  --shadow-lg: 0 40px 100px rgba(15, 45, 35, .18);

  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --maxw: 1280px;
  --pad-x: 32px;

  /* 杂志级字体 */
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-display: "Playfair Display", "Cormorant Garamond", Georgia, serif;
  --font-en: "Inter", "Helvetica Neue", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--ivory);
  line-height: 1.75;
  font-size: 15px;
  font-smooth: always;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection { background: var(--gold); color: var(--green); }

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color .3s ease, opacity .3s ease; }
a:hover { color: var(--gold); }

/* ============================   Layout   ============================= */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: var(--pad-x);
  padding-right: var(--pad-x);
}

.section { padding: 140px 0; position: relative; }
.section--tight { padding: 100px 0; }
.section--green { background: var(--green); color: var(--ivory); }
.section--dark { background: #0A1B14; color: var(--ivory); }
.section-alt { background: linear-gradient(180deg, #FAF7EE 0%, #F3EEDF 100%); }

/* ============================   字体 Typography   ============================= */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: -0.005em;
  color: var(--green);
  margin: 0 0 .7em;
  line-height: 1.28;
}
.section--green h1, .section--green h2, .section--green h3,
.section--dark h1, .section--dark h2, .section--dark h3 { color: var(--ivory); }

h1 { font-size: clamp(48px, 5.5vw, 88px); font-weight: 700; }
h2 { font-size: clamp(32px, 3.6vw, 52px); font-weight: 600; }
h3 { font-size: 20px; font-weight: 600; letter-spacing: .02em; }
p  { margin: 0 0 1em; color: var(--ink-2); }
.section--green p, .section--dark p { color: rgba(247, 245, 239, .82); }

p.lead { font-size: 16px; }

/* ============================   小字眉 Eyebrow   ============================= */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: .5em;
  text-transform: uppercase;
  color: var(--gold);
  font-weight: 500;
  margin-bottom: 28px;
  position: relative;
}
.eyebrow::before {
  content: "";
  display: block;
  width: 36px;
  height: 1px;
  background: var(--gold);
  flex-shrink: 0;
}
.section--green .eyebrow, .section--dark .eyebrow { color: var(--gold-2); }
.section--green .eyebrow::before, .section--dark .eyebrow::before { background: var(--gold-2); }

/* ============================   Section Head   ============================= */
.section-head {
  text-align: center;
  max-width: 860px;
  margin: 0 auto 80px;
}
.section-head .eyebrow { display: inline-flex; }
.section-head .lead {
  font-family: var(--font-serif);
  font-size: clamp(24px, 2.6vw, 34px);
  color: var(--green);
  font-weight: 600;
  line-height: 1.4;
  margin-top: 8px;
  letter-spacing: .01em;
}
.section-head .lead em {
  display: block;
  color: var(--ink-2);
  font-style: normal;
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 400;
  margin-top: 16px;
  letter-spacing: .3em;
  text-transform: uppercase;
  opacity: .85;
}
.section--green .section-head .lead { color: var(--gold-2); }
.section--green .section-head .lead em { color: rgba(247, 245, 239, .7); }

/* ============================   分隔线 Dividers   ============================= */
.hairline {
  width: 40px;
  height: 1px;
  background: var(--gold);
  margin: 0 auto;
  opacity: .6;
}

/* ============================   Header / Nav   ============================= */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(247, 245, 239, .88);
  backdrop-filter: saturate(140%) blur(20px);
  -webkit-backdrop-filter: saturate(140%) blur(20px);
  border-bottom: 1px solid var(--line-soft);
  transition: background .3s ease, box-shadow .3s ease, border-color .3s ease;
}
.site-header.is-transparent {
  background: transparent;
  border-bottom-color: transparent;
}
.site-header.is-scrolled {
  background: rgba(247, 245, 239, .95);
  border-bottom-color: rgba(15, 45, 35, .1);
  box-shadow: var(--shadow-sm);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 92px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 16px;
  font-weight: 700;
  letter-spacing: .08em;
}
.brand-mark {
  width: 46px; height: 46px;
  border-radius: 12px;
  background: var(--green);
  display: grid;
  place-items: center;
  flex-shrink: 0;
  overflow: hidden;
  transition: transform .4s ease;
  box-shadow: 0 4px 14px rgba(15, 45, 35, .18);
  border: 1px solid rgba(176, 141, 87, .3);
}
.brand-mark img {
  width: 100%; height: 100%;
  object-fit: contain;
  padding: 4px;
}
.brand:hover .brand-mark { transform: rotate(-2deg) scale(1.03); }

.brand-text {
  display: inline-flex;
  flex-direction: column;
  line-height: 1.15;
}
.brand-text strong {
  font-family: var(--font-en);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .32em;
  color: var(--green);
}
.brand-text small {
  display: block;
  font-family: var(--font-en);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .35em;
  color: var(--ink-3);
  margin-top: 6px;
  text-transform: uppercase;
}

.site-header.is-transparent .brand-mark {
  background: rgba(247, 245, 239, .12);
  border-color: rgba(247, 245, 239, .25);
}
.site-header.is-transparent .brand-text strong { color: var(--ivory); }
.site-header.is-transparent .brand-text small { color: rgba(247,245,239,.65); }

.nav-menu { flex: 1; display: flex; justify-content: center; }
.nav-menu ul {
  list-style: none; margin: 0; padding: 0;
  display: flex; gap: 4px; flex-wrap: wrap;
}
.nav-menu li { position: relative; }
.nav-menu a {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  padding: 10px 18px;
  font-family: var(--font-serif);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .1em;
  color: var(--green);
  position: relative;
  transition: color .3s ease;
  line-height: 1.2;
}
.nav-menu a span {
  font-family: var(--font-en);
  font-size: 9px;
  color: var(--ink-3);
  letter-spacing: .22em;
  margin-top: 4px;
  font-weight: 400;
  text-transform: uppercase;
}
.nav-menu a::after {
  content: "";
  position: absolute;
  left: 18px; right: 18px; bottom: 4px;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transition: transform .4s ease;
  transform-origin: left;
}
.nav-menu a:hover,
.nav-menu a.nav-link-active { color: var(--green); }
.nav-menu a:hover::after,
.nav-menu a.nav-link-active::after { transform: scaleX(1); }
.nav-menu a.nav-link-active { color: var(--gold); }
.nav-menu a.nav-link-active span { color: var(--gold-dark); }

.site-header.is-transparent .nav-menu a { color: var(--ivory); }
.site-header.is-transparent .nav-menu a span { color: rgba(247,245,239,.55); }
.site-header.is-transparent .nav-menu a:hover,
.site-header.is-transparent .nav-menu a.nav-link-active { color: var(--gold-2); }

/* Mobile toggle */
.nav-toggle {
  display: none;
  width: 44px; height: 44px;
  background: transparent;
  border: 1px solid rgba(15, 45, 35, .15);
  border-radius: 10px;
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
}
.nav-toggle span {
  position: absolute;
  left: 12px; right: 12px;
  height: 1px; background: var(--green);
  transition: all .3s ease;
}
.nav-toggle span:nth-child(1) { top: 17px; }
.nav-toggle span:nth-child(2) { top: 22px; }
.nav-toggle span:nth-child(3) { top: 27px; }
.site-header.is-transparent .nav-toggle { border-color: rgba(247,245,239,.3); }
.site-header.is-transparent .nav-toggle span { background: var(--ivory); }

/* ============================   Hero   ============================= */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  color: var(--ivory);
  background:
    radial-gradient(ellipse at 20% 20%, rgba(176, 141, 87, .15) 0%, transparent 55%),
    radial-gradient(ellipse at 80% 60%, rgba(176, 141, 87, .1) 0%, transparent 55%),
    linear-gradient(135deg, #0A1B14 0%, #14382C 50%, #0A1B14 100%);
}
.hero-media {
  position: absolute; inset: 0;
  background-size: cover;
  background-position: center;
  filter: saturate(1.08) brightness(.92);
  opacity: .75;
  transition: transform 2.5s ease, opacity 1.5s ease;
}
.hero-media::after {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 80% 100% at 30% 40%, transparent 0%, rgba(10,27,20,.4) 70%, rgba(10,27,20,.85) 100%);
}
.hero-overlay {
  position: absolute; inset: 0;
  background:
    linear-gradient(120deg, rgba(10, 27, 20, .7) 0%, rgba(10, 27, 20, .35) 45%, rgba(10, 27, 20, .1) 100%),
    linear-gradient(180deg, rgba(10, 27, 20, .15) 0%, rgba(10, 27, 20, .8) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  padding: 200px 0 120px;
  max-width: 900px;
  opacity: 1;
}
.hero .eyebrow {
  color: var(--gold-2);
  margin-bottom: 32px;
}
.hero .eyebrow::before { background: var(--gold-2); }
.hero h1 {
  color: var(--ivory);
  font-size: clamp(52px, 6.5vw, 96px);
  line-height: 1.05;
  margin-bottom: 24px;
  font-weight: 700;
  letter-spacing: -0.015em;
  font-family: var(--font-serif);
  text-shadow: 0 2px 40px rgba(10, 27, 20, .55), 0 0 20px rgba(10,27,20,.6);
}
.hero h1 em {
  display: block;
  font-style: normal;
  color: var(--gold-2);
  margin-top: 10px;
  font-family: var(--font-display);
  font-weight: 500;
}
.hero h1 span {
  display: block;
  color: var(--gold-2);
  font-family: var(--font-display);
  font-size: .36em;
  letter-spacing: .18em;
  font-weight: 400;
  font-style: italic;
  margin-top: 24px;
  line-height: 1.4;
  opacity: .95;
}
.hero p.lead {
  font-size: clamp(15px, 1.3vw, 17px);
  color: rgba(247, 245, 239, .92);
  max-width: 720px;
  line-height: 1.9;
  margin-bottom: 48px;
}
.hero p.lead em {
  display: block;
  font-family: var(--font-en);
  font-style: normal;
  color: rgba(247, 245, 239, .7);
  font-size: 13px;
  letter-spacing: .2em;
  text-transform: uppercase;
  margin-top: 16px;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

/* Hero 装饰 */
.hero-decor {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
}
.hero-decor-line {
  position: absolute;
  right: 8%;
  top: 30%;
  width: 1px;
  height: 220px;
  background: linear-gradient(180deg, transparent, rgba(176, 141, 87, .5), transparent);
}
.hero-decor-label {
  position: absolute;
  right: 5%;
  top: 25%;
  font-family: var(--font-en);
  font-size: 10px;
  letter-spacing: .5em;
  color: var(--gold-2);
  writing-mode: vertical-rl;
  opacity: .7;
}

/* ============================   按钮 Buttons   ============================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 18px 34px;
  border-radius: 4px;
  font-family: var(--font-en);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .35em;
  text-transform: uppercase;
  transition: all .3s ease;
  cursor: pointer;
  border: 1px solid transparent;
  line-height: 1;
}
.btn-gold {
  background: var(--gold);
  color: var(--green);
  border-color: var(--gold);
  box-shadow: 0 8px 24px rgba(176, 141, 87, .35);
  position: relative;
  overflow: hidden;
}
.btn-gold::before {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 100%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(247, 245, 239, .4), transparent);
  transition: left .6s ease;
}
.btn-gold:hover::before { left: 100%; }
.btn-gold:hover {
  background: var(--gold-2);
  border-color: var(--gold-2);
  color: var(--green);
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(176, 141, 87, .45);
}
.btn-outline {
  background: transparent;
  color: var(--ivory);
  border-color: rgba(247, 245, 239, .4);
}
.btn-outline:hover {
  border-color: var(--gold-2);
  color: var(--gold-2);
  background: rgba(176, 141, 87, .12);
}
.btn-dark {
  background: var(--green);
  color: var(--ivory);
  border-color: var(--green);
}
.btn-dark:hover {
  background: var(--green-3);
  color: var(--gold-2);
  transform: translateY(-2px);
}

/* ============================   统计数字 Stats   ============================= */
.stats-row {
  display: flex;
  align-items: center;
  gap: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.stat {
  flex: 1;
  text-align: left;
  padding: 56px 40px;
  position: relative;
  border-right: 1px solid var(--line);
}
.stat:last-child { border-right: none; }
.stat-num {
  font-family: var(--font-display);
  font-size: clamp(48px, 5vw, 72px);
  font-weight: 400;
  color: var(--green);
  letter-spacing: -0.02em;
  line-height: 1;
  display: block;
  margin-bottom: 12px;
}
.stat-num sup {
  font-size: .35em;
  color: var(--gold);
  font-weight: 500;
  vertical-align: super;
  margin-left: 2px;
}
.stat-label {
  font-family: var(--font-serif);
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: .05em;
  display: block;
}
.stat-label span {
  display: block;
  font-family: var(--font-en);
  font-size: 10px;
  color: var(--ink-3);
  letter-spacing: .3em;
  text-transform: uppercase;
  margin-top: 6px;
  font-weight: 400;
}

@media (max-width: 900px) {
  .stats-row { flex-direction: column; }
  .stat { border-right: none; border-bottom: 1px solid var(--line); padding: 40px 24px; }
}

/* ============================   卡片 Cards   ============================= */
.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 44px 32px;
  transition: transform .45s ease, box-shadow .45s ease, border-color .45s ease;
  border: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}
.card h3 {
  font-family: var(--font-serif);
  font-size: 20px;
  margin-bottom: 16px;
  color: var(--green);
  letter-spacing: .02em;
  font-weight: 600;
}
.card p { margin: 0; color: var(--ink-2); font-size: 14px; line-height: 1.85; }
.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-md);
  border-color: rgba(176, 141, 87, .35);
}

.card-icon-wrap {
  width: 52px; height: 52px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--green) 0%, var(--green-3) 100%);
  color: var(--gold-2);
  display: grid; place-items: center;
  font-size: 20px;
  font-weight: 700;
  font-family: var(--font-en);
  margin-bottom: 28px;
  position: relative;
  transition: transform .4s ease;
}
.card:hover .card-icon-wrap { transform: rotate(-4deg) scale(1.06); }
.card-icon-wrap::before {
  content: attr(data-icon);
  font-size: 18px;
  color: var(--gold-2);
  letter-spacing: .1em;
}

/* ============================   产区卡片 Origin region cards   ============================= */
.origin-card {
  display: grid;
  grid-template-columns: 400px 1fr;
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  transition: transform .45s ease, box-shadow .45s ease;
  margin-bottom: 32px;
}
.origin-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.origin-card-img {
  height: 100%;
  min-height: 280px;
  background-size: cover;
  background-position: center;
  position: relative;
}
.origin-card-img::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(15,45,35,.15), rgba(15,45,35,.35));
}
.origin-card-body {
  padding: 40px 44px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.origin-card-body h3 {
  font-family: var(--font-serif);
  font-size: 26px;
  margin-bottom: 16px;
  color: var(--green);
}
.origin-card-body h3 span {
  display: block;
  font-size: 14px;
  color: var(--ink-2);
  font-weight: 500;
  margin-top: 4px;
}
.origin-card-body p {
  font-size: 15px;
  color: var(--ink-2);
  margin: 8px 0;
  line-height: 1.85;
}
.origin-card-body p strong {
  color: var(--green);
  font-weight: 600;
}
.origin-card-tag {
  position: absolute;
  top: 16px;
  left: 16px;
  background: rgba(255,255,255,.92);
  color: var(--green);
  font-size: 12px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 20px;
  z-index: 2;
  letter-spacing: .5px;
}
@media (max-width: 900px) {
  .origin-card { grid-template-columns: 1fr; }
  .origin-card-img { min-height: 220px; }
  .origin-card-body { padding: 28px 24px; }
}

/* ============================   图片卡片 Image cards   ============================= */
.img-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--green);
  aspect-ratio: 4 / 5;
  color: var(--ivory);
  cursor: pointer;
  transition: transform .6s ease, box-shadow .6s ease;
  display: block;
}
.img-card::before {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(10, 27, 20, 0) 0%, rgba(10, 27, 20, .5) 60%, rgba(10, 27, 20, .95) 100%);
  z-index: 1;
  transition: opacity .4s ease;
}
.img-card-img {
  position: absolute; inset: 0;
  background-size: cover;
  background-position: center;
  transform: scale(1.08);
  transition: transform 1.4s cubic-bezier(.2, .8, .2, 1);
}
.img-card:hover .img-card-img { transform: scale(1.15); }
.img-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.img-card-body {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 36px 32px;
  z-index: 2;
}
.img-card-tag {
  font-family: var(--font-en);
  font-size: 10px;
  letter-spacing: .4em;
  text-transform: uppercase;
  color: var(--gold-2);
  margin-bottom: 16px;
  font-weight: 500;
}
.img-card h3 {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 600;
  color: var(--ivory);
  margin: 0 0 10px;
  letter-spacing: .02em;
}
.img-card p {
  font-family: var(--font-en);
  font-size: 12px;
  color: rgba(247, 245, 239, .72);
  margin: 0;
  letter-spacing: .18em;
  text-transform: uppercase;
  font-weight: 400;
}

/* ============================   双栏 Feature   ============================= */
.feature-grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 100px;
  align-items: center;
  margin-bottom: 120px;
}
.feature-grid:last-child { margin-bottom: 0; }
.feature-grid:nth-child(even) { grid-template-columns: 1fr 1.05fr; }
.feature-grid:nth-child(even) .feature-media { order: 2; }

.feature-media {
  position: relative;
  aspect-ratio: 5 / 4;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--green);
  box-shadow: var(--shadow-md);
}
.feature-media img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 1s ease;
}
.feature-media:hover img { transform: scale(1.04); }
.feature-media::after {
  content: "";
  position: absolute;
  left: -30px; bottom: -30px;
  width: 70%; height: 60%;
  border: 1px solid var(--gold);
  border-radius: var(--radius-xl);
  z-index: -1;
  opacity: .5;
}

.feature-body .eyebrow { margin-bottom: 22px; }
.feature-body h2 {
  font-family: var(--font-serif);
  font-size: clamp(32px, 3.4vw, 48px);
  color: var(--green);
  margin-top: 8px;
  margin-bottom: 24px;
  font-weight: 600;
  line-height: 1.3;
}
.feature-body h2 span {
  display: block;
  font-family: var(--font-display);
  font-style: italic;
  font-size: .45em;
  color: var(--gold);
  letter-spacing: .12em;
  margin-top: 14px;
  font-weight: 400;
}
.feature-list {
  list-style: none;
  padding: 0;
  margin: 28px 0 0;
  display: grid;
  gap: 8px;
}
.feature-list li {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
  color: var(--ink-2);
}
.feature-list li:last-child { border-bottom: none; }
.feature-list strong {
  color: var(--green);
  font-weight: 600;
  display: block;
  font-family: var(--font-serif);
  font-size: 17px;
  margin-bottom: 6px;
}
.feature-num {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 400;
  color: var(--gold);
  min-width: 36px;
  line-height: 1;
  padding-top: 4px;
  font-style: italic;
}

@media (max-width: 900px) {
  .feature-grid,
  .feature-grid:nth-child(even) { grid-template-columns: 1fr; gap: 40px; }
  .feature-grid:nth-child(even) .feature-media { order: 0; }
}

/* ============================   产业链 Chain   ============================= */
.chain-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  position: relative;
}
.chain-step {
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: 48px 36px;
  border: 1px solid var(--line);
  transition: all .45s ease;
  position: relative;
  overflow: hidden;
}
.chain-step::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), var(--gold-2));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .6s cubic-bezier(.2, .8, .2, 1);
}
.chain-step:hover {
  border-color: rgba(176, 141, 87, .45);
  transform: translateY(-8px);
  box-shadow: var(--shadow-md);
}
.chain-step:hover::before { transform: scaleX(1); }
.chain-num {
  font-family: var(--font-display);
  font-size: 52px;
  font-weight: 400;
  color: var(--gold);
  margin-bottom: 20px;
  display: block;
  font-style: italic;
  line-height: 1;
  opacity: .9;
}
.chain-step h3 {
  font-family: var(--font-serif);
  font-size: 22px;
  margin-bottom: 12px;
  color: var(--green);
  font-weight: 600;
}
.chain-step h3 span {
  display: block;
  font-family: var(--font-en);
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: .28em;
  text-transform: uppercase;
  margin-top: 10px;
  font-weight: 500;
}
.chain-step p {
  font-size: 14px;
  color: var(--ink-2);
  margin: 12px 0 0;
  line-height: 1.85;
}

@media (max-width: 1100px) { .chain-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .chain-grid { grid-template-columns: 1fr; } }

/* ============================   极简流程图 Flow Chart（核心视觉）  ============================= */
.flow {
  position: relative;
  padding: 0;
  background: var(--white);
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-md);
}

.flow-head {
  padding: 64px 80px 0;
  text-align: center;
  border-bottom: 1px solid var(--line);
  padding-bottom: 56px;
}
.flow-head .eyebrow { margin-bottom: 18px; justify-content: center; }
.flow-head h2 {
  font-family: var(--font-serif);
  font-size: clamp(28px, 3vw, 44px);
  font-weight: 600;
  color: var(--green);
  margin: 0 0 14px;
}
.flow-head h2 em {
  display: block;
  font-style: italic;
  font-family: var(--font-display);
  color: var(--gold);
  font-weight: 400;
  margin-top: 8px;
  font-size: .5em;
  letter-spacing: .15em;
}
.flow-head p {
  color: var(--ink-2);
  max-width: 620px;
  margin: 0 auto;
  font-size: 15px;
  line-height: 1.8;
}

.flow-steps {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  position: relative;
}
.flow-step {
  padding: 56px 32px 64px;
  text-align: center;
  position: relative;
  border-right: 1px solid var(--line);
  transition: background .45s ease;
}
.flow-step:last-child { border-right: none; }
.flow-step:hover {
  background: linear-gradient(180deg, rgba(176, 141, 87, .04), transparent);
}

/* 连接线 */
.flow-step::after {
  content: "→";
  position: absolute;
  right: -10px;
  top: 72px;
  font-size: 18px;
  color: var(--gold);
  font-family: var(--font-en);
  opacity: .7;
  z-index: 2;
  background: var(--white);
  padding: 0 4px;
  animation: flow-arrow 1.6s ease-in-out infinite;
}
.flow-step:last-child::after { display: none; }

@keyframes flow-arrow {
  0%, 100% { transform: translateX(0); opacity: .55; }
  50% { transform: translateX(6px); opacity: 1; }
}

.flow-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px; height: 56px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--white);
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 400;
  color: var(--gold);
  margin: 0 auto 28px;
  position: relative;
  z-index: 2;
  font-style: italic;
  box-shadow: 0 4px 14px rgba(15, 45, 35, .06);
  transition: all .45s ease;
}
.flow-step:hover .flow-num {
  background: var(--green);
  color: var(--ivory);
  transform: scale(1.1);
  box-shadow: 0 10px 28px rgba(15, 45, 35, .25);
  border-color: var(--green);
}
.flow-step h3 {
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--green);
  margin: 0 0 10px;
  font-weight: 600;
  letter-spacing: .03em;
  line-height: 1.4;
}
.flow-step h3 span {
  display: block;
  font-family: var(--font-en);
  font-size: 10px;
  color: var(--ink-3);
  letter-spacing: .25em;
  text-transform: uppercase;
  margin-top: 8px;
  font-weight: 500;
}
.flow-step p {
  font-size: 13px;
  color: var(--ink-2);
  margin: 12px auto 0;
  line-height: 1.7;
  max-width: 200px;
}

/* 装饰线条 */
.flow-line {
  position: absolute;
  left: 60px; right: 60px;
  top: 100px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold) 15%, var(--gold) 85%, transparent);
  opacity: .5;
  z-index: 1;
  pointer-events: none;
}

/* flow footer 底部详情 */
.flow-foot {
  display: flex;
  padding: 40px 80px;
  border-top: 1px solid var(--line);
  gap: 60px;
  background: linear-gradient(180deg, var(--ivory), #FAF7EE);
}
.flow-foot-item {
  flex: 1;
  text-align: left;
  position: relative;
}
.flow-foot-num {
  font-family: var(--font-display);
  font-size: 44px;
  font-weight: 400;
  color: var(--gold);
  font-style: italic;
  line-height: 1;
  margin-bottom: 12px;
  opacity: .85;
}
.flow-foot-item h4 {
  font-family: var(--font-serif);
  font-size: 15px;
  color: var(--green);
  font-weight: 600;
  margin: 0 0 8px;
}
.flow-foot-item h4 span {
  display: block;
  font-family: var(--font-en);
  font-size: 10px;
  color: var(--ink-3);
  letter-spacing: .25em;
  text-transform: uppercase;
  margin-top: 6px;
  font-weight: 500;
}
.flow-foot-item p {
  font-size: 13px;
  color: var(--ink-2);
  margin: 0;
  line-height: 1.7;
}

@media (max-width: 1200px) {
  .flow-steps { grid-template-columns: repeat(3, 1fr); }
  .flow-step { border-right: 1px solid var(--line); }
  .flow-step:nth-child(3n) { border-right: none; }
  .flow-step:nth-child(-n+3) { border-bottom: 1px solid var(--line); }
  .flow-step::after { display: none; }
  .flow-head { padding: 48px 40px 40px; }
  .flow-foot { padding: 32px 40px; flex-direction: column; gap: 24px; }
}
@media (max-width: 640px) {
  .flow-steps { grid-template-columns: repeat(2, 1fr); }
  .flow-step { border-right: 1px solid var(--line); }
  .flow-step:nth-child(3n) { border-right: 1px solid var(--line); }
  .flow-step:nth-child(2n) { border-right: none; }
  .flow-step:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .flow-step:nth-child(3), .flow-step:nth-child(4) { border-bottom: 1px solid var(--line); }
}

/* ============================   产品 Products   ============================= */
.product-card {
  background: var(--white);
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--line);
  transition: all .5s ease;
  display: flex;
  flex-direction: column;
}
.product-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-md);
  border-color: rgba(176, 141, 87, .4);
}
.product-card-img {
  aspect-ratio: 4 / 3;
  background-size: cover;
  background-position: center;
  background-color: var(--green);
  position: relative;
  transition: transform .8s ease;
}
.product-card-img::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 27, 20, 0) 50%, rgba(10, 27, 20, .4) 100%);
  opacity: 0;
  transition: opacity .4s ease;
}
.product-card:hover .product-card-img::after { opacity: 1; }
.product-card-tag {
  position: absolute;
  top: 20px; left: 20px;
  padding: 8px 16px;
  background: rgba(15, 45, 35, .9);
  color: var(--gold-2);
  font-size: 10px;
  letter-spacing: .3em;
  text-transform: uppercase;
  border-radius: 2px;
  font-family: var(--font-en);
  font-weight: 500;
  z-index: 2;
}
.product-card-body { padding: 32px 28px; flex: 1; display: flex; flex-direction: column; }
.product-card-body h3 {
  font-family: var(--font-serif);
  font-size: 22px;
  margin-bottom: 10px;
  color: var(--green);
  font-weight: 600;
  letter-spacing: .02em;
}
.product-card-body h3 span {
  display: block;
  font-family: var(--font-en);
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: .28em;
  text-transform: uppercase;
  margin-top: 8px;
  font-weight: 500;
}
.product-card-body p { font-size: 14px; color: var(--ink-2); margin: 12px 0 0; flex: 1; line-height: 1.85; }

/* ============================   Trade cities   ============================= */
.city-card {
  position: relative;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-xl);
  overflow: hidden;
  color: var(--ivory);
  transition: transform .6s ease, box-shadow .6s ease;
}
.city-card-img {
  position: absolute; inset: 0;
  background-size: cover; background-position: center;
  transform: scale(1.06);
  transition: transform 1.4s cubic-bezier(.2, .8, .2, 1);
}
.city-card:hover .city-card-img { transform: scale(1.14); }
.city-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
.city-card::before {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(10, 27, 20, .4) 0%, rgba(10, 27, 20, .92) 100%);
  z-index: 1;
}
.city-card-body {
  position: absolute; inset: 0;
  z-index: 2;
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.city-code {
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: .4em;
  color: var(--gold-2);
  font-weight: 500;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(176, 141, 87, .35);
  display: inline-block;
  width: fit-content;
}
.city-card-body h3 {
  font-family: var(--font-serif);
  font-size: clamp(28px, 2.6vw, 36px);
  margin: 0 0 8px;
  color: var(--ivory);
  font-weight: 600;
  letter-spacing: .02em;
}
.city-card-body h3 span {
  display: block;
  font-family: var(--font-display);
  font-style: italic;
  font-size: .5em;
  color: var(--gold-2);
  letter-spacing: .1em;
  margin-top: 8px;
  font-weight: 400;
}
.city-card-body p {
  font-size: 13px;
  color: rgba(247, 245, 239, .82);
  margin: 12px 0 0;
  letter-spacing: .04em;
  line-height: 1.7;
}

/* ============================   支柱 Pillars   ============================= */
.pillars {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 28px;
}
@media (max-width: 1100px) { .pillars { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .pillars { grid-template-columns: 1fr; } }
.pillar {
  padding: 52px 36px 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--white);
  transition: all .5s ease;
  position: relative;
  overflow: hidden;
}
.pillar-num {
  font-family: var(--font-display);
  font-size: 44px;
  font-weight: 400;
  color: var(--gold);
  letter-spacing: -0.01em;
  margin-bottom: 28px;
  display: block;
  line-height: 1;
  font-style: italic;
  opacity: .85;
}
.pillar h3 {
  font-family: var(--font-serif);
  font-size: 22px;
  margin-bottom: 16px;
  color: var(--green);
  font-weight: 600;
}
.pillar h3 span {
  display: block;
  font-family: var(--font-en);
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: .28em;
  text-transform: uppercase;
  margin-top: 10px;
  font-weight: 500;
}
.pillar p { font-size: 14px; color: var(--ink-2); margin: 0; line-height: 1.85; }
.pillar:hover { transform: translateY(-8px); border-color: rgba(176, 141, 87, .5); box-shadow: var(--shadow-md); }

/* ============================   Roadmap / timeline   ============================= */
.roadmap {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
  padding: 24px 0;
}
@media (max-width: 1100px) { .roadmap { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .roadmap { grid-template-columns: 1fr; } }

.roadmap-item {
  position: relative;
  text-align: left;
  padding: 36px 30px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  transition: all .45s ease;
  overflow: hidden;
}
.roadmap-item:hover {
  border-color: rgba(176, 141, 87, .5);
  transform: translateY(-8px);
  box-shadow: var(--shadow-md);
}
.roadmap-year {
  font-family: var(--font-display);
  font-size: 44px;
  font-weight: 400;
  color: var(--gold);
  line-height: 1;
  margin-bottom: 20px;
  letter-spacing: -0.01em;
  display: inline-block;
  font-style: italic;
  opacity: .9;
}
.roadmap-item h3 {
  font-family: var(--font-serif);
  font-size: 19px;
  margin-bottom: 12px;
  color: var(--green);
  font-weight: 600;
  letter-spacing: .02em;
}
.roadmap-item p {
  font-size: 14px;
  color: var(--ink-2);
  margin: 0;
  line-height: 1.75;
}

/* ============================   Goal cards   ============================= */
.goals-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
@media (max-width: 900px) { .goals-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .goals-grid { grid-template-columns: 1fr; } }

.goal-card {
  padding: 48px 28px;
  background: var(--white);
  border-radius: var(--radius-xl);
  border: 1px solid var(--line);
  text-align: center;
  transition: all .45s ease;
}
.goal-card:hover {
  border-color: rgba(176, 141, 87, .5);
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}
.goal-num {
  font-family: var(--font-display);
  font-size: clamp(40px, 4vw, 58px);
  font-weight: 400;
  color: var(--green);
  letter-spacing: -0.02em;
  margin-bottom: 14px;
  line-height: 1;
  font-style: italic;
}
.goal-card h3 {
  font-family: var(--font-serif);
  font-size: 18px;
  margin-bottom: 10px;
  color: var(--green);
  font-weight: 600;
  letter-spacing: .03em;
}
.goal-card p {
  font-family: var(--font-en);
  font-size: 11px;
  color: var(--ink-3);
  margin: 0;
  letter-spacing: .25em;
  text-transform: uppercase;
  font-weight: 500;
}

/* ============================   CTA banner   ============================= */
.cta-banner {
  position: relative;
  padding: 160px 0;
  overflow: hidden;
}
.cta-bg {
  position: absolute; inset: 0;
  background-size: cover;
  background-position: center;
}
.cta-bg::after {
  content: "";
  position: absolute; inset: 0;
  background:
    linear-gradient(135deg, rgba(10, 27, 20, .9), rgba(10, 27, 20, .95));
}
.cta-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 860px;
  margin: 0 auto;
}
.cta-content .eyebrow {
  color: var(--gold-2);
  display: inline-flex;
  justify-content: center;
}
.cta-content h2 {
  color: var(--ivory);
  font-family: var(--font-serif);
  font-size: clamp(34px, 4.2vw, 58px);
  margin: 0 0 24px;
  font-weight: 600;
  line-height: 1.25;
}
.cta-content h2 em {
  display: block;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 400;
  color: var(--gold-2);
  font-size: .45em;
  letter-spacing: .14em;
  margin-top: 14px;
}
.cta-content p {
  color: rgba(247, 245, 239, .85);
  font-size: 16px;
  margin-bottom: 48px;
  line-height: 1.85;
}

/* ============================   Contact / Form   ============================= */
.contact-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}
@media (max-width: 900px) { .contact-wrap { grid-template-columns: 1fr; gap: 40px; } }
.contact-info {
  padding-right: 20px;
}
.contact-info h3 {
  font-family: var(--font-serif);
  font-size: 28px;
  color: var(--green);
  margin-bottom: 24px;
  font-weight: 600;
}
.contact-info p { font-size: 15px; color: var(--ink-2); line-height: 1.85; }
.contact-form h3 {
  font-size: 26px;
  color: var(--green);
  margin-bottom: 10px;
  font-weight: 600;
  font-family: var(--font-serif);
}
.contact-form h4 {
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: .3em;
  color: var(--green);
  font-weight: 500;
  margin: 24px 0 10px;
  text-transform: uppercase;
}
.contact-form .email {
  color: var(--gold);
  font-weight: 500;
  letter-spacing: .02em;
}
.contact-form label {
  display: block;
  font-family: var(--font-en);
  font-size: 10px;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 22px 0 10px;
  font-weight: 500;
}
.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  padding: 16px 20px;
  border: 1px solid var(--line);
  background: var(--white);
  border-radius: 8px;
  font-family: var(--font-sans);
  font-size: 15px;
  color: var(--ink);
  transition: border-color .3s ease, background .3s ease, box-shadow .3s ease;
  box-sizing: border-box;
  outline: none;
}
.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  border-color: var(--gold);
  box-shadow: 0 0 0 4px rgba(176, 141, 87, .14);
}
.contact-form textarea {
  min-height: 140px;
  resize: vertical;
  line-height: 1.7;
}
.contact-form .btn-gold {
  margin-top: 32px;
  cursor: pointer;
  border: none;
}

/* ============================   Footer   ============================= */
.site-footer {
  background: #0A1B14;
  color: rgba(247, 245, 239, .75);
  padding: 100px 0 0;
  position: relative;
  overflow: hidden;
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  opacity: .6;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr 1.2fr;
  gap: 60px;
  padding-bottom: 72px;
}
@media (max-width: 1100px) { .footer-grid { grid-template-columns: 1fr 1fr 1fr; gap: 48px; } }
@media (max-width: 680px) { .footer-grid { grid-template-columns: 1fr 1fr; gap: 40px; } }

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.footer-brand .brand-mark {
  width: 56px; height: 56px;
  font-size: 22px;
  background: rgba(247, 245, 239, .08);
  border-color: rgba(176, 141, 87, .3);
  border-radius: 12px;
  overflow: hidden;
}
.footer-brand strong {
  font-family: var(--font-en);
  color: var(--ivory);
  font-size: 14px;
  letter-spacing: .3em;
  font-weight: 700;
}
.footer-brand small {
  display: block;
  font-family: var(--font-display);
  font-size: 12px;
  color: rgba(247, 245, 239, .55);
  letter-spacing: .1em;
  font-style: italic;
}
.footer-brand p {
  font-size: 14px;
  color: rgba(247, 245, 239, .7);
  line-height: 1.8;
  margin: 8px 0 0;
}

.footer-col h4 {
  color: var(--ivory);
  font-family: var(--font-en);
  font-size: 11px;
  letter-spacing: .35em;
  text-transform: uppercase;
  margin: 0 0 28px;
  font-weight: 500;
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(176, 141, 87, .25);
}
.footer-col ul {
  list-style: none;
  padding: 0; margin: 0;
  display: grid;
  gap: 12px;
}
.footer-col a {
  font-size: 14px;
  color: rgba(247, 245, 239, .7);
  transition: color .3s ease;
  letter-spacing: .02em;
  font-family: var(--font-serif);
}
.footer-col a:hover { color: var(--gold-2); }
.footer-col p {
  font-size: 14px;
  color: rgba(247, 245, 239, .7);
  margin: 0 0 10px;
  line-height: 1.8;
}
.footer-contact .email {
  color: var(--gold-2);
  font-weight: 500;
  margin-top: 16px;
  display: block;
  letter-spacing: .02em;
  font-family: var(--font-en);
  font-size: 14px;
}

.footer-bottom {
  border-top: 1px solid rgba(247, 245, 239, .08);
  padding: 32px 0 36px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 12px;
  color: rgba(247, 245, 239, .5);
  letter-spacing: .05em;
  font-family: var(--font-en);
}

/* ============================   网格通用 Grid   ============================= */
.grid {
  display: grid;
  gap: 28px;
}
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-5 { grid-template-columns: repeat(5, 1fr); }
.grid-6 { grid-template-columns: repeat(6, 1fr); }

@media (max-width: 1100px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-5, .grid-6 { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 720px) {
  .grid-2, .grid-3, .grid-4, .grid-5, .grid-6 { grid-template-columns: 1fr; }
}

/* ============================   Fade in animation   ============================= */
/* 默认可见 — JS 负责先隐藏再平滑显示，避免JS不工作时内容消失 */
.fade-in {
  opacity: 1;
  transform: translateY(0);
  transition: opacity .9s cubic-bezier(.2, .8, .2, 1), transform .9s cubic-bezier(.2, .8, .2, 1);
}

/* ============================   Responsive tweaks   ============================= */
@media (max-width: 1100px) {
  .nav-menu { display: none; }
  .nav.is-open .nav-menu {
    display: flex;
    position: absolute;
    top: 92px; left: 0; right: 0;
    background: var(--ivory);
    padding: 20px 32px 32px;
    gap: 4px;
    flex-direction: column;
    box-shadow: var(--shadow-md);
    border-top: 1px solid var(--line);
  }
  .nav.is-open .nav-menu ul {
    flex-direction: column;
    gap: 4px;
  }
  .nav.is-open .nav-menu a {
    padding: 14px 8px;
    border-bottom: 1px solid var(--line);
    align-items: flex-start;
  }
  .nav.is-open .nav-menu li:last-child a { border-bottom: none; }
  .nav { position: relative; }
  .nav-toggle { display: block; }
}
@media (max-width: 760px) {
  :root { --pad-x: 20px; }
  .section { padding: 80px 0; }
  .section--tight { padding: 60px 0; }
  .nav { height: 72px; }
  .brand-mark { width: 40px; height: 40px; border-radius: 10px; }
  .brand-text strong { font-size: 12px; letter-spacing: .28em; }
  .brand-text small { display: none; }
  .hero-content { padding: 160px 0 100px; }
  .hero h1 { font-size: clamp(40px, 12vw, 64px); }
  .footer-brand .brand-mark { width: 48px; height: 48px; }
}

/* ============================   Breadcrumb 面包屑   ============================= */
.breadcrumb-bar {
  background: rgba(15, 45, 35, .04);
  border-bottom: 1px solid rgba(15, 45, 35, .08);
  padding: 14px 0;
  margin-top: 78px;
  font-family: var(--font-en);
  font-size: 13px;
  letter-spacing: .03em;
}
body[data-theme="dark"] .breadcrumb-bar {
  background: rgba(247, 245, 239, .03);
  border-bottom-color: rgba(247, 245, 239, .08);
}
.breadcrumb-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}
.breadcrumb-item {
  color: rgba(15, 45, 35, .55);
  font-weight: 500;
}
body[data-theme="dark"] .breadcrumb-item {
  color: rgba(247, 245, 239, .55);
}
.breadcrumb-item a {
  color: rgba(15, 45, 35, .65);
  text-decoration: none;
  transition: color .2s ease;
}
.breadcrumb-item a:hover {
  color: var(--gold-2, #C8A85B);
}
body[data-theme="dark"] .breadcrumb-item a {
  color: rgba(247, 245, 239, .65);
}
body[data-theme="dark"] .breadcrumb-item a:hover {
  color: var(--gold-2, #C8A85B);
}
.breadcrumb-item.active {
  color: var(--gold-2, #C8A85B);
  font-weight: 600;
}
.breadcrumb-sep {
  color: rgba(15, 45, 35, .35);
  font-size: 12px;
  user-select: none;
}
body[data-theme="dark"] .breadcrumb-sep {
  color: rgba(247, 245, 239, .35);
}
@media (max-width: 720px) {
  .breadcrumb-bar {
    margin-top: 64px;
    padding: 10px 0;
    font-size: 12px;
  }
}

/* ============================   Data Visualization 图表   ============================= */
.viz-section {
  background: linear-gradient(180deg, rgba(15, 45, 35, .03) 0%, rgba(15, 45, 35, .06) 100%);
  border-top: 1px solid rgba(15, 45, 35, .08);
  border-bottom: 1px solid rgba(15, 45, 35, .08);
}
body[data-theme="dark"] .viz-section {
  background: linear-gradient(180deg, rgba(247, 245, 239, .02) 0%, rgba(247, 245, 239, .04) 100%);
  border-top-color: rgba(247, 245, 239, .08);
  border-bottom-color: rgba(247, 245, 239, .08);
}
.viz-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  max-width: 1200px;
  margin: 0 auto;
}
.viz-card {
  background: var(--ivory, #F7F5EF);
  border: 1px solid rgba(15, 45, 35, .1);
  border-radius: 12px;
  padding: 32px 24px;
  text-align: center;
  transition: transform .3s ease, box-shadow .3s ease;
}
body[data-theme="dark"] .viz-card {
  background: rgba(15, 45, 35, .25);
  border-color: rgba(247, 245, 239, .1);
}
.viz-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(15, 45, 35, .12);
}
.viz-card-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gold-1, #E5C77E), var(--gold-2, #C8A85B));
  color: var(--ivory, #F7F5EF);
  font-size: 28px;
  font-family: var(--font-serif);
  font-weight: 700;
}
.viz-card h3 {
  font-family: var(--font-serif);
  font-size: 22px;
  color: var(--green, #0F2D23);
  margin: 0 0 8px;
  font-weight: 700;
}
body[data-theme="dark"] .viz-card h3 {
  color: var(--ivory, #F7F5EF);
}
.viz-card-num {
  font-family: var(--font-serif);
  font-size: 48px;
  font-weight: 900;
  color: var(--gold-2, #C8A85B);
  line-height: 1;
  margin: 8px 0;
}
.viz-card-desc {
  color: var(--ink-2, #6a7d74);
  font-size: 14px;
  line-height: 1.7;
  margin-top: 8px;
}
body[data-theme="dark"] .viz-card-desc {
  color: rgba(247, 245, 239, .65);
}
.viz-bars {
  margin-top: 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.viz-bar-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--ink-2, #6a7d74);
}
body[data-theme="dark"] .viz-bar-row {
  color: rgba(247, 245, 239, .65);
}
.viz-bar-label {
  flex: 0 0 90px;
  text-align: right;
  font-weight: 500;
}
.viz-bar-track {
  flex: 1;
  height: 8px;
  background: rgba(15, 45, 35, .08);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}
body[data-theme="dark"] .viz-bar-track {
  background: rgba(247, 245, 239, .08);
}
.viz-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--gold-1, #E5C77E), var(--gold-2, #C8A85B));
  border-radius: 4px;
  transition: width 1.2s cubic-bezier(.2, .8, .2, 1);
}
.viz-bar-value {
  flex: 0 0 36px;
  text-align: left;
  font-weight: 600;
  color: var(--green, #0F2D23);
}
body[data-theme="dark"] .viz-bar-value {
  color: var(--ivory, #F7F5EF);
}
@media (max-width: 1100px) {
  .viz-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 720px) {
  .viz-grid {
    grid-template-columns: 1fr;
  }
  .viz-card-num { font-size: 36px; }
}

/* ============================   About Section 4 卡片（紧凑）   ============================= */
.about-section {
  background: linear-gradient(180deg, var(--ivory, #F7F5EF) 0%, #efece3 100%);
  border-bottom: 1px solid rgba(15, 45, 35, .08);
}
body[data-theme="dark"] .about-section {
  background: linear-gradient(180deg, rgba(15, 45, 35, .18) 0%, rgba(15, 45, 35, .06) 100%);
  border-bottom-color: rgba(247, 245, 239, .08);
}
.about-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  max-width: 1280px;
  margin: 0 auto;
}
.about-card {
  background: rgba(255, 255, 255, .6);
  border: 1px solid rgba(15, 45, 35, .08);
  border-radius: 10px;
  padding: 18px 16px 20px;
  text-align: center;
  transition: all .3s ease;
  position: relative;
  overflow: hidden;
}
body[data-theme="dark"] .about-card {
  background: rgba(15, 45, 35, .32);
  border-color: rgba(247, 245, 239, .08);
}
.about-card:hover {
  transform: translateY(-3px);
  border-color: var(--gold-2, #C8A85B);
  box-shadow: 0 8px 22px rgba(15, 45, 35, .1);
}
.about-card-num {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 900;
  color: var(--gold-2, #C8A85B);
  line-height: 1;
  margin-bottom: 8px;
  letter-spacing: .05em;
}
.about-card-title {
  font-family: var(--font-serif);
  font-size: 14px;
  font-weight: 700;
  color: var(--green, #0F2D23);
  margin: 0 0 4px;
  line-height: 1.35;
}
body[data-theme="dark"] .about-card-title {
  color: var(--ivory, #F7F5EF);
}
.about-card-sub {
  font-family: var(--font-en);
  font-size: 9px;
  letter-spacing: .22em;
  color: var(--ink-3, #94a39c);
  text-transform: uppercase;
  margin-bottom: 10px;
  font-weight: 500;
}
.about-card-divider {
  width: 28px;
  height: 1px;
  background: var(--gold-2, #C8A85B);
  margin: 0 auto 10px;
  opacity: .55;
}
.about-card-line {
  font-size: 11.5px;
  color: var(--ink-2, #6a7d74);
  margin: 0 0 4px;
  line-height: 1.55;
}
.about-card-line:last-child { margin-bottom: 0; }
body[data-theme="dark"] .about-card-line {
  color: rgba(247, 245, 239, .72);
}
@media (max-width: 980px) {
  .about-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .about-grid { grid-template-columns: 1fr; }
  .about-card { padding: 16px 14px 18px; }
  .about-card-num { font-size: 20px; }
  .about-card-title { font-size: 13px; }
}

/* ============================   Define Section 4 卡片 + 点击展开   ============================= */
.define-section {
  background: linear-gradient(180deg, var(--ivory, #F7F5EF) 0%, #efece3 100%);
  border-bottom: 1px solid rgba(15, 45, 35, .08);
  padding: 48px 0 36px;
}
body[data-theme="dark"] .define-section {
  background: linear-gradient(180deg, rgba(15, 45, 35, .25) 0%, rgba(15, 45, 35, .12) 100%);
  border-bottom-color: rgba(247, 245, 239, .08);
}
.define-head {
  text-align: center;
  margin-bottom: 28px;
}
.define-head .eyebrow {
  font-size: 11px;
  letter-spacing: .35em;
  color: var(--gold-2, #C8A85B);
  font-weight: 600;
  font-family: var(--font-en, sans-serif);
}
.define-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 1280px;
  margin: 0 auto 24px;
}
.define-card {
  background: rgba(255, 255, 255, .55);
  border: 1px solid rgba(15, 45, 35, .08);
  border-radius: 10px;
  padding: 22px 18px;
  text-align: center;
  transition: all .3s ease;
}
body[data-theme="dark"] .define-card {
  background: rgba(15, 45, 35, .35);
  border-color: rgba(247, 245, 239, .08);
}
.define-card:hover {
  transform: translateY(-3px);
  border-color: var(--gold-2, #C8A85B);
  box-shadow: 0 8px 20px rgba(15, 45, 35, .1);
}
.define-card-num {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 900;
  color: var(--gold-2, #C8A85B);
  line-height: 1;
  margin-bottom: 10px;
  letter-spacing: .05em;
}
.define-card-title {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--green, #0F2D23);
  margin: 0 0 6px;
}
body[data-theme="dark"] .define-card-title {
  color: var(--ivory, #F7F5EF);
}
.define-card-desc {
  font-size: 13px;
  color: var(--ink-2, #6a7d74);
  margin: 0 0 8px;
  line-height: 1.5;
}
body[data-theme="dark"] .define-card-desc {
  color: rgba(247, 245, 239, .75);
}
.define-card-alt {
  font-size: 10px;
  letter-spacing: .25em;
  color: var(--ink-3, #94a39c);
  text-transform: uppercase;
  font-family: var(--font-en, sans-serif);
  font-weight: 500;
}
.define-details {
  max-width: 980px;
  margin: 0 auto;
  border-top: 1px dashed rgba(15, 45, 35, .12);
  padding-top: 18px;
}
body[data-theme="dark"] .define-details {
  border-top-color: rgba(247, 245, 239, .12);
}
.define-details summary {
  list-style: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--gold-2, #C8A85B);
  letter-spacing: .08em;
  user-select: none;
  padding: 6px 14px;
  border: 1px solid var(--gold-2, #C8A85B);
  border-radius: 24px;
  transition: all .25s ease;
  margin: 0 auto;
  display: table;
}
.define-details summary::-webkit-details-marker { display: none; }
.define-details summary::after {
  content: "▾";
  font-size: 11px;
  transition: transform .25s ease;
}
.define-details[open] summary::after { transform: rotate(180deg); }
.define-details summary:hover {
  background: var(--gold-2, #C8A85B);
  color: var(--ivory, #F7F5EF);
}
.define-details-body {
  margin-top: 18px;
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink-2, #4a5b54);
  text-align: justify;
  padding: 0 8px;
}
body[data-theme="dark"] .define-details-body {
  color: rgba(247, 245, 239, .82);
}
@media (max-width: 980px) {
  .define-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .define-grid { grid-template-columns: 1fr; }
  .define-section { padding: 36px 0 28px; }
  .define-card-num { font-size: 24px; }
  .define-card-title { font-size: 15px; }
  .define-details-body { font-size: 14px; }
}