/* ============================================================
   Let-Lab Help-Lab · 研酶伙伴平台
   品牌色: 皇家蓝 #0F4E9B / 卡片 #1557A8 / 青色 #0891B2 / 金色 #F59E0B
   ============================================================ */

:root {
  --royal: #0F4E9B;
  --royal-dark: #0B3A75;
  --royal-deep: #072A57;
  --card-blue: #1557A8;
  --cyan: #0891B2;
  --cyan-light: #22D3EE;
  --gold: #F59E0B;
  --gold-light: #FBBF24;
  --ink: #101828;
  --ink-soft: #475467;
  --gray-bg: #F8FAFC;
  --gray-line: #E4E7EC;
  --white: #FFFFFF;
  --radius: 16px;
  --shadow: 0 12px 40px rgba(7, 42, 87, 0.10);
  --shadow-lg: 0 24px 60px rgba(7, 42, 87, 0.16);
  --font-en: 'Inter', 'Helvetica Neue', sans-serif;
  --font-cn: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-cn);
  color: var(--ink);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.container {
  width: min(1200px, 92%);
  margin: 0 auto;
}

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

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 15px;
  transition: all .25s ease;
  border: 2px solid transparent;
  cursor: pointer;
  text-align: center;
}
.btn-primary {
  background: var(--royal);
  color: var(--white);
}
.btn-primary:hover { background: var(--royal-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(15, 78, 155, .35); }
.btn-ghost {
  background: transparent;
  color: var(--royal);
  border-color: var(--royal);
}
.btn-ghost:hover { background: rgba(15, 78, 155, .08); transform: translateY(-2px); }
.btn-light { background: var(--white); color: var(--royal); }
.btn-light:hover { background: #E8F0FA; transform: translateY(-2px); }
.btn-outline-light { background: transparent; color: var(--white); border-color: rgba(255,255,255,.6); }
.btn-outline-light:hover { border-color: var(--white); background: rgba(255,255,255,.12); transform: translateY(-2px); }
.btn-lg { padding: 15px 34px; font-size: 16px; border-radius: 12px; }
.btn-sm { padding: 8px 18px; font-size: 14px; }
.btn-block { width: 100%; }
.link-arrow { color: var(--royal); font-weight: 600; }
.link-arrow:hover { color: var(--cyan); }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 14px 0;
  transition: all .3s ease;
  background: transparent;
}
.site-header.scrolled {
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(14px);
  box-shadow: 0 2px 20px rgba(7,42,87,.08);
  padding: 8px 0;
}
.site-header.scrolled .brand-text small { color: var(--ink-soft); }

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: nowrap;
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 56px; height: 56px;
  display: grid; place-items: center;
  border-radius: 12px;
  position: relative;
}
.brand-logo {
  position: absolute;
  width: 56px; height: 56px;
  object-fit: contain;
  transition: opacity .25s ease;
}
.brand-logo-white { opacity: 1; }
.brand-logo-dark { opacity: 0; }
.site-header.scrolled .brand-logo-white { opacity: 0; }
.site-header.scrolled .brand-logo-dark { opacity: 1; }
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-text strong {
  font-family: var(--font-en);
  font-size: 18px;
  color: var(--royal-dark);
  letter-spacing: -0.3px;
}
.brand-text strong em { font-style: normal; color: var(--cyan); }
.brand-text small { font-size: 11px; color: rgba(255,255,255,.85); letter-spacing: .5px; }
.site-header:not(.scrolled) .brand-text strong { color: var(--white); }
.site-header:not(.scrolled) .brand-text em { color: var(--cyan-light); }

.main-nav { display: flex; gap: 22px; white-space: nowrap; flex-shrink: 1; }
.main-nav a {
  font-size: 15px;
  font-weight: 500;
  color: rgba(255,255,255,.9);
  transition: color .2s;
  position: relative;
  white-space: nowrap;
  flex-shrink: 0;
}
.site-header.scrolled .main-nav a { color: var(--ink-soft); }
.main-nav a:hover, .site-header.scrolled .main-nav a:hover { color: var(--cyan); }
.main-nav a::after {
  content: '';
  position: absolute;
  left: 0; bottom: -5px;
  width: 0; height: 2px;
  background: var(--cyan);
  transition: width .25s;
}
.main-nav a:hover::after { width: 100%; }

.nav-cta { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.search-toggle {
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  width: 38px; height: 38px;
  display: grid; place-items: center;
  border-radius: 10px;
  color: rgba(255,255,255,.9);
  transition: all .2s;
}
.site-header.scrolled .search-toggle { color: var(--royal); }
.search-toggle:hover { background: rgba(255,255,255,.15); }
.site-header.scrolled .search-toggle:hover { background: rgba(15,78,155,.1); }
.nav-toggle { display: none; background: none; border: none; font-size: 26px; color: var(--royal); cursor: pointer; }
.site-header:not(.scrolled) .nav-toggle { color: var(--white); }

/* ---------- 站内搜索面板 ---------- */
.search-panel {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(7, 42, 87, .55);
  backdrop-filter: blur(8px);
  opacity: 0;
  visibility: hidden;
  transition: opacity .25s ease, visibility .25s;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 12vh 20px 40px;
}
.search-panel.open { opacity: 1; visibility: visible; }
.search-panel-inner {
  width: min(720px, 100%);
  background: var(--white);
  border-radius: 20px;
  box-shadow: 0 30px 80px rgba(7,42,87,.35);
  overflow: hidden;
  transform: translateY(-16px) scale(.98);
  transition: transform .3s ease;
}
.search-panel.open .search-panel-inner { transform: translateY(0) scale(1); }
.search-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 22px;
  border-bottom: 1px solid var(--gray-line);
}
.search-bar-ico { font-size: 20px; }
.search-bar input {
  flex: 1;
  border: none;
  outline: none;
  font-family: var(--font-cn);
  font-size: 17px;
  color: var(--ink);
  background: transparent;
}
.search-bar input::placeholder { color: #98A2B3; }
.search-close {
  background: none;
  border: none;
  font-size: 18px;
  color: var(--ink-soft);
  cursor: pointer;
  width: 34px; height: 34px;
  border-radius: 8px;
  transition: all .2s;
}
.search-close:hover { background: var(--gray-bg); color: var(--ink); }

.search-results {
  max-height: 56vh;
  overflow-y: auto;
  padding: 10px 12px;
}
.search-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 14px;
  border-radius: 12px;
  transition: background .2s;
}
.search-item:hover { background: var(--gray-bg); }
.si-type {
  flex-shrink: 0;
  font-size: 11px;
  font-weight: 700;
  color: var(--cyan);
  background: rgba(8,145,178,.1);
  padding: 3px 10px;
  border-radius: 100px;
  margin-top: 3px;
}
.si-body { flex: 1; display: flex; flex-direction: column; gap: 2px; }
.si-body strong { font-size: 15.5px; color: var(--ink); }
.si-body mark {
  background: rgba(245,158,11,.25);
  color: #92400E;
  border-radius: 3px;
  padding: 0 2px;
}
.si-en { font-family: var(--font-en); font-size: 12px; color: var(--ink-soft); }
.si-desc { font-size: 13px; color: var(--ink-soft); line-height: 1.5; }
.si-arrow { color: var(--cyan); font-weight: 700; margin-top: 4px; }

.search-empty { text-align: center; padding: 40px 20px; color: var(--ink-soft); }
.search-empty .sub { font-size: 13px; color: #98A2B3; margin-top: 8px; }
.search-hint {
  text-align: center;
  padding: 14px;
  font-size: 12.5px;
  color: #98A2B3;
  border-top: 1px solid var(--gray-line);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(160deg, var(--royal-deep) 0%, var(--royal) 55%, var(--card-blue) 100%);
  color: var(--white);
  padding: 130px 0 90px;
  overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; pointer-events: none; }
.orb { position: absolute; border-radius: 50%; filter: blur(60px); opacity: .5; }
.orb-1 { width: 420px; height: 420px; background: var(--cyan); top: -120px; right: -80px; }
.orb-2 { width: 320px; height: 320px; background: var(--gold); bottom: -100px; left: 10%; opacity: .25; }
.orb-3 { width: 220px; height: 220px; background: var(--cyan-light); top: 40%; left: -60px; opacity: .2; }
.grid-lines {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, #000 30%, transparent 75%);
}

.hero-inner { position: relative; z-index: 2; max-width: 900px; }
.hero-logo-wrap { margin-bottom: 22px; }
.hero-logo { width: 300px; height: 300px; object-fit: contain; filter: drop-shadow(0 12px 32px rgba(0,0,0,.28)); }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 16px;
  border-radius: 100px;
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.25);
  font-size: 14px;
  letter-spacing: .3px;
  margin-bottom: 26px;
  backdrop-filter: blur(6px);
}
.hero-badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--gold-light); box-shadow: 0 0 12px var(--gold-light); }

.hero-title {
  font-family: var(--font-en);
  font-size: clamp(52px, 9vw, 108px);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -2px;
  margin-bottom: 22px;
}
.hl-1 { color: var(--white); }
.hl-2 { background: linear-gradient(120deg, var(--cyan-light), var(--gold-light)); -webkit-background-clip: text; background-clip: text; color: transparent; }

.hero-sub {
  font-size: clamp(20px, 3vw, 30px);
  font-weight: 700;
  margin-bottom: 14px;
  color: #F0F6FF;
}
.hero-desc { font-size: 17px; color: rgba(255,255,255,.82); max-width: 620px; margin-bottom: 34px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 60px; }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 700px;
}
.stat {
  background: rgba(255,255,255,.09);
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 14px;
  padding: 18px 16px;
  backdrop-filter: blur(8px);
  text-align: center;
}
.stat strong {
  display: block;
  font-family: var(--font-en);
  font-size: 30px;
  font-weight: 800;
  color: var(--gold-light);
  line-height: 1.1;
}
.stat span { font-size: 13px; color: rgba(255,255,255,.75); }

/* ---------- Section 通用 ---------- */
.section { padding: 96px 0; }
.section-head { max-width: 720px; margin: 0 auto 56px; text-align: center; }
.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2.5px;
  color: var(--cyan);
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-tag.light { color: var(--gold-light); }
.section-head h2 { font-size: clamp(30px, 4vw, 42px); font-weight: 800; color: var(--ink); letter-spacing: -1px; margin-bottom: 14px; }
.section-head p { font-size: 17px; color: var(--ink-soft); }

/* ---------- 卡片 ---------- */
.cards.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.card {
  background: var(--white);
  border: 1px solid var(--gray-line);
  border-radius: var(--radius);
  padding: 36px 30px;
  box-shadow: 0 4px 16px rgba(7,42,87,.04);
  transition: all .3s ease;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: rgba(15,78,155,.25); }
.card-icon {
  width: 64px; height: 64px;
  display: grid; place-items: center;
  font-size: 30px;
  background: linear-gradient(135deg, rgba(15,78,155,.1), rgba(8,145,178,.12));
  border-radius: 16px;
  margin-bottom: 20px;
}
.card h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; color: var(--ink); }
.card p { font-size: 15px; color: var(--ink-soft); }

/* ---------- Lab-to-Lab 市场 ---------- */
.market { background: linear-gradient(180deg, var(--gray-bg) 0%, var(--white) 100%); }
.market-cats {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  margin-bottom: 44px;
}
.market-cat {
  background: var(--white);
  border: 1px solid var(--gray-line);
  border-radius: var(--radius);
  padding: 26px 20px;
  text-align: center;
  transition: all .3s ease;
}
.market-cat:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: rgba(15,78,155,.3); }
.cat-ico { display: block; font-size: 34px; margin-bottom: 12px; }
.market-cat h3 { font-size: 18px; font-weight: 700; margin-bottom: 6px; color: var(--ink); }
.market-cat p { font-size: 13px; color: var(--ink-soft); line-height: 1.5; }

.verify-box {
  background: var(--white);
  border: 1.5px solid rgba(15,78,155,.18);
  border-radius: 20px;
  padding: 38px 34px;
  box-shadow: var(--shadow);
}
.verify-box > h3 { font-size: 22px; font-weight: 800; color: var(--ink); margin-bottom: 26px; }
.verify-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  margin-bottom: 30px;
}
.verify-step {
  background: var(--gray-bg);
  border: 1px solid var(--gray-line);
  border-radius: 14px;
  padding: 24px 20px;
  text-align: center;
  transition: all .3s;
}
.verify-step:hover { box-shadow: var(--shadow); transform: translateY(-4px); }
.verify-step .step-dot { margin-bottom: 12px; }
.verify-step h4 { font-size: 16px; font-weight: 700; margin-bottom: 6px; color: var(--royal); }
.verify-step p { font-size: 13px; color: var(--ink-soft); line-height: 1.5; }
.verify-cta { text-align: center; }
.verify-note {
  margin-top: 16px;
  font-size: 13.5px;
  color: var(--ink-soft);
  background: rgba(245,158,11,.08);
  border: 1px dashed rgba(245,158,11,.4);
  border-radius: 10px;
  padding: 10px 16px;
  display: inline-block;
}

/* ---------- 服务 ---------- */
.services { background: var(--gray-bg); }
.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.service-item {
  background: var(--white);
  border: 1px solid var(--gray-line);
  border-radius: var(--radius);
  padding: 30px 28px;
  transition: all .3s ease;
  position: relative;
  overflow: hidden;
}
.service-item:hover { box-shadow: var(--shadow); transform: translateY(-4px); }
.service-num {
  font-family: var(--font-en);
  font-size: 40px;
  font-weight: 800;
  color: rgba(15,78,155,.12);
  position: absolute; top: 14px; right: 20px;
}
.service-item h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.service-item p { font-size: 14.5px; color: var(--ink-soft); }

/* ---------- 产品 ---------- */
.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; margin-bottom: 40px; }
.product-card {
  background: var(--white);
  border: 1px solid var(--gray-line);
  border-radius: var(--radius);
  padding: 28px;
  transition: all .3s ease;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.product-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-6px); border-color: rgba(15,78,155,.3); }
.product-top { display: flex; justify-content: space-between; align-items: center; }
.product-code {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--cyan);
  background: rgba(8,145,178,.08);
  padding: 3px 10px;
  border-radius: 100px;
  letter-spacing: .5px;
}
.product-badge {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 100px;
  background: rgba(245,158,11,.12);
  color: #B45309;
}
.product-card h3 { font-size: 18px; font-weight: 700; color: var(--ink); }
.product-card .en-name { font-family: var(--font-en); font-size: 13px; color: var(--ink-soft); margin-bottom: 4px; }
.product-specs { font-size: 13.5px; color: var(--ink-soft); line-height: 1.8; }
.product-specs strong { color: var(--royal); }
.product-foot { margin-top: auto; padding-top: 12px; border-top: 1px dashed var(--gray-line); display: flex; justify-content: space-between; align-items: center; }
.product-price { font-family: var(--font-en); font-size: 13px; color: var(--ink-soft); }
.product-price strong { font-size: 16px; color: var(--royal); }
.product-ask { font-size: 14px; font-weight: 600; color: var(--cyan); }
.product-ask:hover { color: var(--royal); }

.product-note {
  background: linear-gradient(120deg, rgba(15,78,155,.05), rgba(8,145,178,.06));
  border: 1px solid rgba(15,78,155,.15);
  border-radius: 14px;
  padding: 22px 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.product-note p { font-size: 14.5px; color: var(--ink-soft); }

/* ---------- 流程 ---------- */
.steps { display: flex; align-items: stretch; justify-content: center; gap: 18px; flex-wrap: wrap; }
.step {
  flex: 1;
  min-width: 220px;
  max-width: 300px;
  background: var(--white);
  border: 1px solid var(--gray-line);
  border-radius: var(--radius);
  padding: 34px 28px;
  text-align: center;
  transition: all .3s;
}
.step:hover { box-shadow: var(--shadow); transform: translateY(-4px); }
.step-dot {
  width: 52px; height: 52px;
  margin: 0 auto 18px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--royal), var(--cyan));
  color: var(--white);
  font-family: var(--font-en);
  font-size: 22px;
  font-weight: 800;
  box-shadow: 0 6px 18px rgba(15,78,155,.35);
}
.step h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.step p { font-size: 14px; color: var(--ink-soft); }
.step-arrow { align-self: center; font-size: 30px; color: var(--cyan); font-weight: 700; padding: 0 4px; }

/* ---------- 伙伴计划 ---------- */
.ambassador {
  background: linear-gradient(150deg, var(--royal-deep) 0%, var(--royal) 60%, var(--card-blue) 100%);
  color: var(--white);
}
.ambassador-inner { display: grid; grid-template-columns: 1.3fr 1fr; gap: 60px; align-items: center; }
.ambassador-text h2 { font-size: clamp(30px, 4vw, 42px); font-weight: 800; letter-spacing: -1px; margin: 4px 0 10px; }
.ambassador-text .lead { font-size: 20px; font-weight: 600; color: var(--gold-light); margin-bottom: 14px; }
.ambassador-text p { color: rgba(255,255,255,.82); font-size: 16px; margin-bottom: 20px; }

.check-list { margin: 22px 0 30px; display: flex; flex-direction: column; gap: 12px; }
.check-list li {
  padding-left: 30px;
  position: relative;
  color: rgba(255,255,255,.9);
  font-size: 15.5px;
}
.check-list li::before {
  content: '✓';
  position: absolute; left: 0; top: 0;
  width: 22px; height: 22px;
  display: grid; place-items: center;
  background: rgba(34,211,238,.2);
  border: 1px solid var(--cyan-light);
  color: var(--cyan-light);
  border-radius: 6px;
  font-size: 13px;
  font-weight: 700;
}
.ambassador-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.ambassador-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.mini-stat {
  background: rgba(255,255,255,.09);
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 16px;
  padding: 26px 20px;
  text-align: center;
  backdrop-filter: blur(8px);
  transition: all .3s;
}
.mini-stat:hover { background: rgba(255,255,255,.16); transform: translateY(-4px); }
.mini-stat strong {
  display: block;
  font-family: var(--font-en);
  font-size: 32px;
  font-weight: 800;
  color: var(--gold-light);
}
.mini-stat span { font-size: 13px; color: rgba(255,255,255,.75); }

/* ---------- 为什么选择 ---------- */
.why-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.why-item {
  border-left: 4px solid var(--royal);
  background: var(--white);
  border-radius: 0 14px 14px 0;
  padding: 24px 22px;
  box-shadow: 0 4px 14px rgba(7,42,87,.05);
  transition: all .3s;
}
.why-item:hover { transform: translateX(6px); box-shadow: var(--shadow); }
.why-item h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; color: var(--royal); }
.why-item p { font-size: 14px; color: var(--ink-soft); }

/* ---------- 联系 ---------- */
.contact { background: var(--gray-bg); }
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 56px; }
.contact-info h2 { font-size: clamp(28px, 3.5vw, 38px); font-weight: 800; letter-spacing: -1px; margin-bottom: 14px; }
.contact-info p { color: var(--ink-soft); font-size: 16px; margin-bottom: 30px; }
.contact-lines { display: flex; flex-direction: column; gap: 16px; }
.contact-lines div { display: flex; align-items: center; gap: 12px; font-size: 16px; font-weight: 500; }
.contact-lines span { font-size: 20px; }

.contact-form {
  background: var(--white);
  border: 1px solid var(--gray-line);
  border-radius: var(--radius);
  padding: 34px;
  box-shadow: var(--shadow);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; color: var(--ink); }
.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--gray-line);
  border-radius: 10px;
  font-family: var(--font-cn);
  font-size: 15px;
  color: var(--ink);
  background: var(--white);
  transition: border-color .2s, box-shadow .2s;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none;
  border-color: var(--royal);
  box-shadow: 0 0 0 4px rgba(15,78,155,.1);
}
.form-group textarea { resize: vertical; min-height: 100px; }
.form-note { font-size: 12.5px; color: var(--ink-soft); margin-top: 12px; text-align: center; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--royal-deep);
  color: rgba(255,255,255,.7);
  padding: 48px 0 40px;
}
.footer-inner { display: flex; justify-content: space-between; align-items: center; gap: 30px; flex-wrap: wrap; }
.footer-brand { display: flex; flex-direction: column; align-items: flex-start; gap: 6px; }
.footer-logo img { width: 64px; height: 64px; object-fit: contain; margin-bottom: 4px; }
.footer-brand strong { font-family: var(--font-en); font-size: 20px; color: var(--white); }
.footer-brand strong em { font-style: normal; color: var(--cyan-light); }
.footer-brand p { font-size: 13px; margin-top: 6px; }
.footer-links { display: flex; gap: 22px; }
.footer-links a { font-size: 14px; color: rgba(255,255,255,.65); transition: color .2s; }
.footer-links a:hover { color: var(--cyan-light); }
.footer-copy { width: 100%; text-align: center; font-size: 12.5px; color: rgba(255,255,255,.45); margin-top: 26px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.1); }

/* ---------- 回到顶部 ---------- */
.back-top {
  position: fixed;
  right: 26px; bottom: 26px;
  width: 46px; height: 46px;
  border-radius: 50%;
  border: none;
  background: var(--royal);
  color: var(--white);
  font-size: 20px;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(15,78,155,.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: all .3s;
  z-index: 900;
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { background: var(--royal-dark); }

/* ---------- 响应式 ---------- */
@media (max-width: 992px) {
  .cards.grid-3, .services-grid, .product-grid { grid-template-columns: repeat(2, 1fr); }
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .ambassador-inner { grid-template-columns: 1fr; gap: 40px; }
  .contact-grid { grid-template-columns: 1fr; gap: 36px; }
  .market-cats { grid-template-columns: repeat(3, 1fr); }
  .verify-steps { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .section { padding: 70px 0; }
  .main-nav {
    position: fixed;
    top: 0; right: -100%;
    width: min(320px, 80%);
    height: 100vh;
    background: var(--white);
    flex-direction: column;
    padding: 90px 36px 40px;
    gap: 22px;
    box-shadow: -20px 0 60px rgba(7,42,87,.15);
    transition: right .35s ease;
    z-index: 1100;
  }
  .main-nav.open { right: 0; }
  .main-nav a { color: var(--ink) !important; font-size: 17px; font-weight: 600; }
  .nav-toggle { display: block; z-index: 1200; }
  .nav-cta .btn-sm { display: none; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .steps { flex-direction: column; align-items: center; }
  .step-arrow { transform: rotate(90deg); }
  .hero { min-height: auto; padding: 120px 0 70px; }
  .form-row { grid-template-columns: 1fr; }
  .mobile-only { display: block; }
}

@media (max-width: 560px) {
  .cards.grid-3, .services-grid, .product-grid, .why-grid { grid-template-columns: 1fr; }
  .market-cats { grid-template-columns: repeat(2, 1fr); }
  .verify-steps { grid-template-columns: 1fr; }
  .ambassador-card { grid-template-columns: 1fr 1fr; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .stat strong { font-size: 24px; }
  .contact-form { padding: 24px; }
}

/* ---------- 滚动显示动画 ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.reveal.revealed { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* 打印友好 */
@media print {
  .site-header, .back-top, .hero-actions, .ambassador-actions { display: none; }
  body { color: #000; }
}