/* ============================================================
   圣元药业全球牛磺酸 B2B 出海门户 · 共享样式
   Design System: DESIGN.md v1.0 (Modern Minimal 医药科技蓝绿)
   基底：Stripe 信任层次 × Apple Editorial 留白 × Supabase 翠绿数据语言
   零外部依赖：无 CDN 字体 / 图标，全部系统回退栈 + 内联 SVG
   ============================================================ */

/* ---------- 0. Design Tokens ---------- */
:root {
  /* Primary 青蓝 */
  --color-primary: #0e7490;
  --color-primary-hover: #0c5f76;
  --color-primary-soft: #e0f2f6;
  /* Accent 翠绿 */
  --color-accent: #059669;
  --color-accent-hover: #047857;
  --color-accent-soft: #d1fae5;
  /* Gold 认证点缀（仅限认证/信任语义） */
  --color-gold: #f59e0b;
  --color-gold-soft: #fef3c7;
  /* Neutral */
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-2: #f1f5f9;
  --color-border: #e2e8f0;
  --color-text-primary: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #64748b;
  /* Semantic */
  --color-success: #059669;
  --color-warning: #f59e0b;
  --color-danger: #dc2626;
  --color-info: #0e7490;
  /* Fonts（自托管约束：本地无 Inter 时按系统栈回退，生产环境自托管 woff2） */
  --font-heading: 'Source Serif 4', 'Noto Serif SC', 'Songti SC', 'STSong', Georgia, 'Times New Roman', serif;
  --font-body: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'IBM Plex Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  /* Spacing (8pt) */
  --space-xs: 4px; --space-sm: 8px; --space-md: 16px; --space-lg: 24px;
  --space-xl: 32px; --space-2xl: 48px; --space-3xl: 64px; --space-4xl: 96px;
  /* Radius */
  --radius-sm: 8px; --radius-md: 12px;
  /* Shadow */
  --shadow-raised: 0 1px 3px rgba(15,23,42,.08);
  --shadow-floating: 0 6px 16px rgba(15,23,42,.12);
  --shadow-overlay: 0 12px 32px rgba(15,23,42,.18);
  --shadow-sticky: 0 1px 2px rgba(15,23,42,.06);
  /* Type scale */
  --fs-display: clamp(2.25rem, 1.5rem + 3vw, 3.5rem);
  --fs-h1: clamp(1.875rem, 1.4rem + 2vw, 2.5rem);
  --fs-h2: clamp(1.5rem, 1.2rem + 1.2vw, 2rem);
  --fs-h3: clamp(1.25rem, 1.1rem + 0.6vw, 1.5rem);
  --fs-body: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  --nav-h: 72px;
}
:root[data-theme="dark"] {
  --color-bg: #0f172a; --color-surface: #1e293b; --color-surface-2: #162033;
  --color-border: #334155; --color-text-primary: #f8fafc;
  --color-text-secondary: #94a3b8; --color-text-muted: #94a3b8;
}

/* ---------- 1. Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.65;
  color: var(--color-text-primary);
  background: var(--color-bg);
}
img, svg { display: block; max-width: 100%; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-hover); }
ul[class], ol[class] { list-style: none; }
button { font-family: inherit; cursor: pointer; }
:focus-visible { outline: 2px solid var(--color-gold); outline-offset: 2px; border-radius: 2px; }

h1, h2 { font-family: var(--font-heading); letter-spacing: -0.01em; }
h1 { font-size: var(--fs-h1); font-weight: 700; line-height: 1.15; }
h2 { font-size: var(--fs-h2); font-weight: 600; line-height: 1.25; }
h3 { font-size: var(--fs-h3); font-weight: 600; line-height: 1.35; }
.mono { font-family: var(--font-mono); }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.prose { max-width: 720px; }
.section { padding: var(--space-4xl) 0; }
.section-alt { background: var(--color-surface); border-top: 1px solid var(--color-border); border-bottom: 1px solid var(--color-border); }
.section-head { max-width: 720px; margin-bottom: var(--space-2xl); }
.section-head p { color: var(--color-text-secondary); margin-top: var(--space-md); }
.eyebrow {
  display: inline-block; font-size: 0.75rem; font-weight: 600; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--color-primary); margin-bottom: var(--space-md);
  font-family: var(--font-mono);
}
.eyebrow-accent { color: var(--color-accent); }
.eyebrow-gold { color: #b45309; }

/* ---------- 2. Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 24px; border-radius: var(--radius-sm); font-size: 0.9375rem;
  font-weight: 600; line-height: 1; border: 1px solid transparent;
  transition: all .18s ease; white-space: nowrap;
}
.btn svg { width: 18px; height: 18px; }
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-hover); color: #fff; transform: translateY(-1px); box-shadow: var(--shadow-floating); }
.btn-primary:active { transform: none; box-shadow: inset 0 2px 4px rgba(0,0,0,.15); }
.btn-secondary { background: var(--color-surface); color: var(--color-primary); border-color: var(--color-primary); }
.btn-secondary:hover { background: var(--color-primary-soft); color: var(--color-primary-hover); }
.btn-ghost { background: transparent; color: var(--color-primary); padding: 12px 8px; }
.btn-ghost:hover { text-decoration: underline; }
.btn-lg { padding: 15px 32px; font-size: 1rem; }
.btn-sm { padding: 8px 16px; font-size: 0.875rem; }
.btn[disabled] { opacity: .5; cursor: not-allowed; pointer-events: none; }
.btn-accent { background: var(--color-accent); color: #fff; }
.btn-accent:hover { background: var(--color-accent-hover); color: #fff; }

/* ---------- 3. Header / Navigation ---------- */
.site-header {
  position: sticky; top: 0; z-index: 200;
  background: rgba(255,255,255,.94); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border); box-shadow: var(--shadow-sticky);
}
.nav-inner { display: flex; align-items: center; gap: var(--space-lg); height: var(--nav-h); }
.brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand-mark { width: 36px; height: 36px; flex-shrink: 0; }
.brand-text { line-height: 1.15; }
.brand-text strong { display: block; font-size: 1rem; color: var(--color-text-primary); font-weight: 700; }
.brand-text small { display: block; font-size: 0.6875rem; color: var(--color-text-muted); letter-spacing: .04em; }
.main-nav { display: flex; align-items: center; gap: 2px; margin-left: auto; }
.main-nav a {
  padding: 8px 11px; font-size: 0.875rem; font-weight: 500; color: var(--color-text-secondary);
  border-radius: 6px; position: relative;
}
.main-nav a:hover { color: var(--color-primary); background: var(--color-primary-soft); }
.main-nav a.active { color: var(--color-primary); font-weight: 600; }
.main-nav a.active::after {
  content: ""; position: absolute; left: 11px; right: 11px; bottom: -2px;
  height: 2px; background: var(--color-primary); border-radius: 1px;
}
.nav-actions { display: flex; align-items: center; gap: var(--space-md); }
/* 语言切换 */
.lang-switch { position: relative; }
.lang-btn {
  display: inline-flex; align-items: center; gap: 6px; background: none;
  border: 1px solid var(--color-border); border-radius: var(--radius-sm);
  padding: 8px 12px; font-size: 0.8125rem; font-weight: 600; color: var(--color-text-secondary);
}
.lang-btn:hover { border-color: var(--color-primary); color: var(--color-primary); }
.lang-btn svg { width: 15px; height: 15px; }
.lang-menu {
  position: absolute; top: calc(100% + 8px); right: 0; z-index: 300;
  min-width: 150px; background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-md); box-shadow: var(--shadow-floating); padding: 6px;
  display: none;
}
.lang-menu.open { display: block; }
.lang-menu a {
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px 12px; border-radius: 6px; font-size: 0.875rem; color: var(--color-text-primary);
}
.lang-menu a:hover { background: var(--color-primary-soft); }
.lang-menu a .code { font-family: var(--font-mono); font-size: 0.6875rem; color: var(--color-text-muted); }
.lang-menu a.current { color: var(--color-primary); font-weight: 600; }
/* 汉堡 */
.nav-toggle { display: none; background: none; border: none; padding: 8px; color: var(--color-text-primary); }
.nav-toggle svg { width: 24px; height: 24px; }
.nav-overlay { position: fixed; inset: 0; background: rgba(15,23,42,.4); z-index: 350; display: none; }
.nav-overlay.open { display: block; }

/* ---------- 4. 16:9 Widescreen Video Hero Banner (Apple B2B Style) ---------- */
.hero-video-wrapper {
  position: relative;
  overflow: hidden;
  min-height: 56.25vw; /* 16:9 Aspect Ratio */
  max-height: 720px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 80px 0 70px 0;
  background: #0b1329;
  color: #f8fafc;
  border-bottom: 1px solid var(--color-border);
}
@media (min-width: 1440px) {
  .hero-video-wrapper {
    height: 680px;
  }
}
@media (max-width: 768px) {
  .hero-video-wrapper {
    min-height: 540px;
    padding: 60px 0 80px 0;
  }
}

.hero-video-bg {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: translate(-50%, -50%);
  z-index: 1;
}

.hero-video-overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  background: linear-gradient(180deg, rgba(11, 19, 41, 0.82) 0%, rgba(11, 19, 41, 0.48) 50%, rgba(11, 19, 41, 0.94) 100%);
  backdrop-filter: blur(1px);
}

.hero-content {
  position: relative;
  z-index: 10;
}

.hero-video-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(14, 116, 144, 0.25);
  border: 1px solid rgba(165, 243, 252, 0.4);
  backdrop-filter: blur(12px);
  color: #a5f3fc;
  padding: 6px 16px;
  border-radius: 9999px;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  font-family: var(--font-mono);
  margin-bottom: var(--space-lg);
  box-shadow: 0 4px 14px rgba(14, 116, 144, 0.3);
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulse-ring 1.8s infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1.05); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-video-title {
  color: #ffffff;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
  font-size: clamp(2.3rem, 1.6rem + 3.2vw, 3.8rem);
  font-weight: 800;
  line-height: 1.12;
}

.hero-video-title-gradient {
  background: linear-gradient(135deg, #ffffff 0%, #a5f3fc 50%, #34d399 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-video-lede {
  color: #cbd5e1 !important;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.6);
  font-size: clamp(1.05rem, 0.95rem + 0.5vw, 1.25rem);
  line-height: 1.7;
}

.hero-video-note {
  color: #94a3b8 !important;
}

.btn-glass {
  background: rgba(255, 255, 255, 0.12);
  color: #ffffff !important;
  border: 1px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(12px);
}
.btn-glass:hover {
  background: rgba(255, 255, 255, 0.25);
  color: #ffffff !important;
  border-color: rgba(255, 255, 255, 0.6);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
}

.hero-btn-glow {
  box-shadow: 0 4px 20px rgba(14, 116, 144, 0.5);
}

/* 视频下方画音控制栏 */
.hero-video-controls {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.hero-live-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(15, 23, 42, 0.65);
  border: 1px solid rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(12px);
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.78rem;
  color: #cbd5e1;
}

.live-pulse {
  width: 7px;
  height: 7px;
  background: #ef4444;
  border-radius: 50%;
  animation: pulse-ring-red 1.5s infinite;
}

@keyframes pulse-ring-red {
  0% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.7); }
  70% { box-shadow: 0 0 0 6px rgba(239, 68, 68, 0); }
  100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0); }
}

.hero-audio-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(15, 23, 42, 0.75);
  border: 1px solid rgba(165, 243, 252, 0.3);
  backdrop-filter: blur(12px);
  color: #a5f3fc;
  padding: 8px 16px;
  border-radius: 9999px;
  font-size: 0.8125rem;
  font-weight: 600;
  transition: all 0.2s ease;
}
.hero-audio-btn:hover {
  background: rgba(14, 116, 144, 0.6);
  color: #ffffff;
  border-color: #a5f3fc;
  transform: translateY(-1px);
}
.hero-audio-btn svg {
  width: 16px;
  height: 16px;
}

.hero {
  background: linear-gradient(160deg, #f0f9fb 0%, var(--color-bg) 55%, #f0fdf7 100%);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-4xl) 0;
}
.hero h1.display { font-size: var(--fs-display); line-height: 1.08; font-weight: 700; }
.hero .lede { font-size: clamp(1.0625rem, 1rem + 0.4vw, 1.1875rem); color: var(--color-text-secondary); max-width: 720px; margin-top: var(--space-lg); }
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--space-md); margin-top: var(--space-xl); }
.hero-note { margin-top: var(--space-md); font-size: 0.8125rem; color: var(--color-text-muted); }
.page-hero { padding: var(--space-3xl) 0; background: var(--color-surface); border-bottom: 1px solid var(--color-border); }
.page-hero .lede { color: var(--color-text-secondary); max-width: 720px; margin-top: var(--space-md); }
.breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 0.8125rem; color: var(--color-text-muted); margin-bottom: var(--space-lg); }
.breadcrumb a { color: var(--color-text-muted); }
.breadcrumb a:hover { color: var(--color-primary); }

/* ---------- 5. Trust Data Bar ---------- */
.data-bar { background: var(--color-surface-2); border-top: 1px solid var(--color-border); border-bottom: 1px solid var(--color-border); }
.data-bar-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.data-cell { padding: var(--space-xl) var(--space-lg); border-left: 1px solid var(--color-border); }
.data-cell:first-child { border-left: none; }
.data-cell .num {
  font-family: var(--font-mono); font-size: clamp(1.6rem, 1.2rem + 1.6vw, 2.25rem);
  font-weight: 700; color: var(--color-primary); letter-spacing: -0.02em; line-height: 1.1;
}
.data-cell .label { font-weight: 600; margin-top: 6px; font-size: 0.9375rem; }
.data-cell .desc { font-size: 0.8125rem; color: var(--color-text-secondary); margin-top: 2px; }

/* ---------- 6. Cards ---------- */
.card {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-md); padding: var(--space-lg);
  box-shadow: var(--shadow-raised);
}
.grid { display: grid; gap: var(--space-lg); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
/* 赛道分流卡 */
.track-card {
  display: flex; flex-direction: column; position: relative; overflow: hidden;
  padding-top: calc(var(--space-lg) + 4px);
  transition: transform .18s ease, box-shadow .18s ease;
}
.track-card::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 4px; background: var(--color-primary); }
.track-card.track-b::before { background: var(--color-accent); }
.track-card.track-c::before { background: linear-gradient(90deg, var(--color-primary), var(--color-accent)); }
.track-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-floating); }
.track-tag {
  font-family: var(--font-mono); font-size: 0.6875rem; font-weight: 700; letter-spacing: .1em;
  color: var(--color-primary); text-transform: uppercase;
}
.track-card.track-b .track-tag { color: var(--color-accent); }
.track-card h3 { margin-top: var(--space-sm); }
.track-card .track-desc { color: var(--color-text-secondary); font-size: 0.9375rem; margin-top: var(--space-sm); flex-grow: 0; }
.track-card ul { margin: var(--space-md) 0; display: grid; gap: 8px; flex-grow: 1; }
.track-card ul li { display: flex; gap: 8px; font-size: 0.875rem; color: var(--color-text-secondary); }
.track-card ul li svg { width: 16px; height: 16px; flex-shrink: 0; margin-top: 3px; color: var(--color-accent); }
.track-card .btn { align-self: flex-start; }

/* 买家角色卡 */
.persona-card { display: flex; flex-direction: column; gap: var(--space-md); scroll-margin-top: 96px; }
.persona-head { display: flex; align-items: flex-start; gap: var(--space-md); }
.persona-icon {
  width: 44px; height: 44px; flex-shrink: 0; border-radius: var(--radius-sm);
  background: var(--color-primary-soft); color: var(--color-primary);
  display: flex; align-items: center; justify-content: center;
}
.persona-icon svg { width: 22px; height: 22px; }
.persona-id { font-family: var(--font-mono); font-size: 0.6875rem; font-weight: 700; color: var(--color-text-muted); letter-spacing: .08em; }
.persona-roles { font-size: 0.8125rem; color: var(--color-text-muted); font-family: var(--font-mono); }
.spec-list { display: grid; gap: 8px; }
.spec-list li { display: flex; gap: 8px; font-size: 0.875rem; color: var(--color-text-secondary); }
.spec-list li svg { width: 16px; height: 16px; flex-shrink: 0; margin-top: 3px; color: var(--color-accent); }
.spec-list li strong { color: var(--color-text-primary); font-weight: 600; }
.kv-row { display: flex; gap: 8px; font-size: 0.875rem; }
.kv-row dt { color: var(--color-text-muted); flex-shrink: 0; }
.kv-row dd { color: var(--color-text-secondary); }

/* 品牌卡 */
.brand-card { display: flex; flex-direction: column; overflow: hidden; padding: 0; }
.brand-card .brand-visual { height: 200px; position: relative; display: flex; align-items: center; justify-content: center; }
.brand-card .brand-body { padding: var(--space-lg); display: flex; flex-direction: column; gap: var(--space-md); flex-grow: 1; }
.brand-card h3 { font-family: var(--font-heading); }
.brand-card .brand-sub { font-size: 0.8125rem; color: var(--color-text-muted); font-family: var(--font-mono); letter-spacing: .04em; }
.sku-tag {
  display: inline-block; font-family: var(--font-mono); font-size: 0.75rem;
  background: var(--color-surface-2); border: 1px solid var(--color-border);
  border-radius: 6px; padding: 4px 8px; color: var(--color-text-secondary);
}

/* ---------- 7. 认证徽章 & 认证墙 ---------- */
.cert-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--color-gold-soft); border: 1px solid var(--color-gold);
  border-radius: var(--radius-sm); padding: 8px 12px;
  font-size: 0.75rem; font-weight: 600; color: #92400e; letter-spacing: .02em;
}
.cert-badge svg { width: 16px; height: 16px; color: var(--color-gold); flex-shrink: 0; }
.cert-wall { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-lg); }
.cert-card {
  background: var(--color-surface); border: 1px solid var(--color-gold);
  border-radius: var(--radius-md); padding: var(--space-lg);
  box-shadow: var(--shadow-raised); display: flex; flex-direction: column; gap: var(--space-md);
  transition: transform .18s ease, box-shadow .18s ease;
}
.cert-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-floating); }
.cert-card .cert-icon {
  width: 44px; height: 44px; border-radius: 50%; background: var(--color-gold-soft);
  display: flex; align-items: center; justify-content: center; color: var(--color-gold);
}
.cert-card .cert-icon svg { width: 22px; height: 22px; }
.cert-card .cert-no { font-family: var(--font-mono); font-size: 0.75rem; color: #b45309; word-break: break-all; }
.cert-card p { font-size: 0.875rem; color: var(--color-text-secondary); }

/* ---------- 8. 表格（COA / 特性矩阵） ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--color-border); border-radius: var(--radius-md); background: var(--color-surface); }
table.data-table { width: 100%; border-collapse: collapse; font-size: 0.875rem; min-width: 640px; }
.data-table thead th {
  background: var(--color-primary-soft); color: var(--color-text-primary);
  text-align: left; padding: 14px 16px; font-weight: 600; white-space: nowrap;
}
.data-table td { padding: 14px 16px; border-top: 1px solid var(--color-border); vertical-align: top; }
.data-table tbody tr:nth-child(even) { background: var(--color-surface-2); }
.data-table .val { font-family: var(--font-mono); }
.data-table .std { color: var(--color-text-secondary); }
.pill-pass {
  display: inline-block; font-family: var(--font-mono); font-size: 0.75rem; font-weight: 700;
  background: var(--color-accent-soft); color: var(--color-accent-hover);
  border-radius: 999px; padding: 3px 12px;
}

/* ---------- 9. 表单 ---------- */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-md); }
.form-field { display: flex; flex-direction: column; gap: 6px; }
.form-field.full { grid-column: 1 / -1; }
.form-field label { font-size: 0.875rem; font-weight: 600; }
.form-field label .req { color: var(--color-danger); }
.form-field input, .form-field select, .form-field textarea {
  height: 44px; border: 1px solid var(--color-border); border-radius: var(--radius-sm);
  padding: 0 14px; font-size: 0.9375rem; font-family: inherit;
  background: var(--color-surface); color: var(--color-text-primary);
  appearance: none; -webkit-appearance: none; width: 100%;
}
.form-field select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23475569' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 12px center; padding-right: 36px;
}
.form-field textarea { height: auto; min-height: 110px; padding: 12px 14px; resize: vertical; line-height: 1.5; }
.form-field input:focus, .form-field select:focus, .form-field textarea:focus {
  outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px var(--color-primary-soft);
}
.form-field input::placeholder, .form-field textarea::placeholder { color: var(--color-text-muted); }
.form-hint { font-size: 0.75rem; color: var(--color-text-muted); }

/* ---------- 10. 画廊 ---------- */
.filter-bar { display: flex; flex-wrap: wrap; gap: var(--space-sm); margin-bottom: var(--space-xl); }
.filter-chip {
  border: 1px solid var(--color-border); background: var(--color-surface);
  border-radius: 999px; padding: 8px 18px; font-size: 0.875rem; font-weight: 500;
  color: var(--color-text-secondary); transition: all .15s ease;
}
.filter-chip:hover { border-color: var(--color-primary); color: var(--color-primary); }
.filter-chip.active { background: var(--color-primary); border-color: var(--color-primary); color: #fff; font-weight: 600; }
.filter-chip .count { font-family: var(--font-mono); font-size: 0.75rem; opacity: .75; margin-left: 4px; }
.gallery-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-lg); }
.gallery-item { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md); overflow: hidden; box-shadow: var(--shadow-raised); transition: transform .18s ease, box-shadow .18s ease; }
.gallery-item:hover { transform: translateY(-2px); box-shadow: var(--shadow-floating); }
.gallery-item.hidden { display: none; }
.ph-img { position: relative; display: flex; align-items: center; justify-content: center; height: 180px; }
.ph-img svg { width: 40px; height: 40px; opacity: .55; }
.ph-label {
  position: absolute; bottom: 8px; right: 10px; font-family: var(--font-mono);
  font-size: 0.625rem; letter-spacing: .06em; color: rgba(255,255,255,.85);
  background: rgba(15,23,42,.35); padding: 2px 8px; border-radius: 999px;
}
.ph-blue { background: linear-gradient(135deg, #0e7490 0%, #155e75 60%, #164e63 100%); color: #a5f3fc; }
.ph-green { background: linear-gradient(135deg, #059669 0%, #047857 60%, #065f46 100%); color: #a7f3d0; }
.ph-slate { background: linear-gradient(135deg, #475569 0%, #334155 60%, #1e293b 100%); color: #cbd5e1; }
.ph-gold { background: linear-gradient(135deg, #d97706 0%, #b45309 60%, #92400e 100%); color: #fde68a; }
.ph-teal-soft { background: linear-gradient(135deg, #e0f2f6 0%, #cffafe 100%); color: #0e7490; }
.gallery-meta { padding: 14px 16px; }
.gallery-meta .cat { font-family: var(--font-mono); font-size: 0.625rem; letter-spacing: .1em; text-transform: uppercase; color: var(--color-primary); font-weight: 700; }
.gallery-meta h4 { font-size: 0.875rem; font-weight: 600; margin-top: 4px; }

/* ---------- 11. 下载卡 / 资源 ---------- */
.dl-card { display: flex; align-items: center; gap: var(--space-md); }
.dl-icon {
  width: 44px; height: 44px; flex-shrink: 0; border-radius: var(--radius-sm);
  background: var(--color-primary-soft); color: var(--color-primary);
  display: flex; align-items: center; justify-content: center;
}
.dl-icon svg { width: 22px; height: 22px; }
.dl-body { flex-grow: 1; min-width: 0; }
.dl-body h4 { font-size: 0.9375rem; font-weight: 600; }
.dl-body .dl-meta { font-size: 0.75rem; color: var(--color-text-muted); font-family: var(--font-mono); margin-top: 2px; }

/* ---------- 12. CTA 区块 ---------- */
.cta-band { background: var(--color-primary); color: #fff; padding: var(--space-3xl) 0; }
.cta-band h2 { color: #fff; }
.cta-band p { color: rgba(255,255,255,.82); margin-top: var(--space-md); max-width: 640px; }
.cta-band .btn-primary { background: #fff; color: var(--color-primary); }
.cta-band .btn-primary:hover { background: var(--color-primary-soft); color: var(--color-primary-hover); }
.cta-band .btn-secondary { background: transparent; color: #fff; border-color: rgba(255,255,255,.55); }
.cta-band .btn-secondary:hover { background: rgba(255,255,255,.12); color: #fff; }
.cta-band .cta-actions { display: flex; flex-wrap: wrap; gap: var(--space-md); margin-top: var(--space-xl); }

/* ---------- 13. 提示条 / 备注 ---------- */
.notice {
  display: flex; gap: 10px; align-items: flex-start;
  background: var(--color-gold-soft); border: 1px solid var(--color-gold);
  border-radius: var(--radius-sm); padding: 12px 16px; font-size: 0.8125rem; color: #92400e;
}
.notice svg { width: 18px; height: 18px; flex-shrink: 0; margin-top: 1px; color: var(--color-gold); }
.notice-info { background: var(--color-primary-soft); border-color: var(--color-primary); color: var(--color-primary-hover); }
.notice-info svg { color: var(--color-primary); }

/* ---------- 14. Footer ---------- */
.site-footer { background: #0f172a; color: #94a3b8; margin-top: var(--space-4xl); padding-bottom: 64px; }
.footer-main { display: grid; grid-template-columns: 2fr 1fr 1fr 1.4fr; gap: var(--space-2xl); padding: var(--space-3xl) 0; }
.site-footer h4 { color: #f8fafc; font-size: 0.875rem; font-weight: 600; margin-bottom: var(--space-md); letter-spacing: .02em; }
.site-footer a { color: #94a3b8; }
.site-footer a:hover { color: #e0f2f6; }
.footer-links { display: grid; gap: 10px; font-size: 0.875rem; }
.footer-brand .brand-text strong { color: #f8fafc; }
.footer-brand .brand-text small { color: #64748b; }
.footer-about { font-size: 0.8125rem; margin-top: var(--space-md); line-height: 1.7; max-width: 340px; }
.footer-stock {
  display: inline-flex; align-items: center; gap: 8px; margin-top: var(--space-md);
  font-family: var(--font-mono); font-size: 0.8125rem; color: #f59e0b;
  border: 1px solid rgba(245,158,11,.4); border-radius: 6px; padding: 6px 10px;
}
.footer-contact { display: grid; gap: 10px; font-size: 0.8125rem; }
.footer-contact li { display: flex; gap: 10px; align-items: flex-start; }
.footer-contact svg { width: 16px; height: 16px; flex-shrink: 0; margin-top: 3px; color: #0e7490; }
.footer-langs { display: flex; flex-wrap: wrap; gap: 8px; margin-top: var(--space-md); }
.footer-langs span {
  font-size: 0.6875rem; font-family: var(--font-mono); border: 1px solid #334155;
  border-radius: 999px; padding: 3px 10px; color: #94a3b8;
}
.footer-legal { border-top: 1px solid #1e293b; padding: var(--space-lg) 0; font-size: 0.75rem; line-height: 1.8; }
.footer-legal .lic { font-family: var(--font-mono); color: #cbd5e1; }
.footer-legal p + p { margin-top: 4px; }

/* ---------- 15. 移动端底部吸附 CTA ---------- */
.mobile-cta-bar {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 200;
  display: none; gap: var(--space-sm); padding: 10px 16px calc(10px + env(safe-area-inset-bottom));
  background: rgba(255,255,255,.96); backdrop-filter: blur(8px);
  border-top: 1px solid var(--color-border); box-shadow: 0 -4px 16px rgba(15,23,42,.08);
}
.mobile-cta-bar .btn { flex: 1; }

/* ---------- 16. 杂项 ---------- */
.badge-row { display: flex; flex-wrap: wrap; gap: var(--space-sm); }
.anchor-nav { display: flex; flex-wrap: wrap; gap: var(--space-sm); margin-top: var(--space-lg); }
.anchor-nav a {
  font-size: 0.8125rem; font-weight: 600; font-family: var(--font-mono);
  border: 1px solid var(--color-border); background: var(--color-surface);
  border-radius: 999px; padding: 6px 14px; color: var(--color-text-secondary);
}
.anchor-nav a:hover { border-color: var(--color-primary); color: var(--color-primary); }
.divider { border: none; border-top: 1px solid var(--color-border); margin: var(--space-2xl) 0; }
.mt-md { margin-top: var(--space-md); } .mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); } .mt-2xl { margin-top: var(--space-2xl); }
.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }
.small { font-size: 0.875rem; }

/* ============================================================
   Responsive
   ============================================================ */
/* Tablet 640–1024 */
@media (max-width: 1024px) {
  .main-nav { display: none; }
  .nav-toggle { display: inline-flex; }
  .nav-cta { display: none; }
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .cert-wall { grid-template-columns: repeat(2, 1fr); }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .data-bar-grid { grid-template-columns: repeat(2, 1fr); }
  .data-cell:nth-child(3) { border-left: none; }
  .data-cell { border-top: 1px solid var(--color-border); }
  .data-cell:nth-child(-n+2) { border-top: none; }
  .footer-main { grid-template-columns: 1fr 1fr; }
  /* 移动抽屉导航 */
  .main-nav.drawer-open {
    display: flex; flex-direction: column; align-items: stretch; gap: 4px;
    position: fixed; top: 0; right: 0; bottom: 0; z-index: 400;
    width: min(320px, 86vw); background: var(--color-surface);
    padding: 88px 20px 24px; box-shadow: var(--shadow-overlay); margin: 0;
    overflow-y: auto;
  }
  .main-nav.drawer-open a { font-size: 1rem; padding: 13px 14px; border-radius: var(--radius-sm); }
  .main-nav.drawer-open a.active { background: var(--color-primary-soft); }
  .main-nav.drawer-open a.active::after { display: none; }
  .drawer-close {
    display: none; position: fixed; top: 16px; right: 16px; z-index: 410;
    background: var(--color-surface-2); border: 1px solid var(--color-border);
    border-radius: 50%; width: 40px; height: 40px;
    align-items: center; justify-content: center; color: var(--color-text-primary);
  }
  .drawer-close.open { display: flex; }
  .drawer-close svg { width: 20px; height: 20px; }
}
/* Mobile < 640 */
@media (max-width: 640px) {
  .container { padding: 0 16px; }
  :root { --nav-h: 56px; }
  .brand-mark { width: 30px; height: 30px; }
  .brand-text small { display: none; }
  .section { padding: var(--space-3xl) 0; }
  .hero { padding: var(--space-3xl) 0; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .cert-wall { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: 1fr; }
  .data-bar-grid { grid-template-columns: 1fr; }
  .data-cell { border-left: none; border-top: 1px solid var(--color-border); padding: var(--space-lg); }
  .data-cell:first-child { border-top: none; }
  .form-grid { grid-template-columns: 1fr; }
  .footer-main { grid-template-columns: 1fr; gap: var(--space-xl); }
  .mobile-cta-bar { display: flex; }
  body { padding-bottom: 68px; }
  .hero-actions .btn { flex: 1 1 100%; }
}
/* Desktop only helpers */
@media (min-width: 1025px) {
  .drawer-close { display: none !important; }
}
@media print {
  .site-header, .mobile-cta-bar, .cta-band { display: none; }
}