/* ============================================================
   ARZENCE — Regulatory Solutions
   医疗器械法规合规服务网站样式
   设计基调：深海军蓝 + 金 #B28A3E，白底，克制、可信、专业
   ============================================================ */

/* ---------- 1. Tokens & Reset ---------- */
:root {
  --navy-900: #0B1F33;
  --navy-800: #102A45;
  --navy-700: #16395C;
  --navy-600: #1E4A77;
  --gold: #B28A3E;
  --gold-soft: #F4EBDC;
  --ink: #1B2534;
  --muted: #5B6675;
  --faint: #8B94A3;
  --line: #E4E8EE;
  --bg: #FFFFFF;
  --bg-soft: #F6F8FA;
  --danger: #B4442E;
  --radius-card: 16px;
  --radius-btn: 999px;
  --ease: cubic-bezier(.4, 0, .2, 1);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei",
          "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Helvetica Neue",
          Arial, sans-serif;
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
::selection { background: var(--gold); color: #fff; }

/* ---------- 2. 布局工具 ---------- */
.container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 96px 0; }
.section-soft { background: var(--bg-soft); }
.section-tight { padding: 64px 0; }

.section-head { max-width: 720px; margin-bottom: 48px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 16px;
}
.eyebrow::before {
  content: "";
  width: 22px; height: 2px;
  background: var(--gold);
  border-radius: 2px;
}
.section-head.center .eyebrow::after {
  content: "";
  width: 22px; height: 2px;
  background: var(--gold);
  border-radius: 2px;
}

h1, h2, h3 { color: var(--navy-900); line-height: 1.3; font-weight: 700; }
h1 { font-size: clamp(30px, 4.4vw, 46px); letter-spacing: .01em; }
h2 { font-size: clamp(24px, 3vw, 32px); margin-bottom: 16px; }
h3 { font-size: 18px; }

.lead { font-size: 17px; color: var(--muted); }
.section-head p + p { margin-top: 10px; }

/* ---------- 3. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: var(--radius-btn);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  transition: all 240ms var(--ease);
  white-space: nowrap;
}
.btn-sm { padding: 9px 20px; font-size: 14px; }

.btn-primary { background: var(--navy-800); color: #fff; }
.btn-primary:hover { background: var(--navy-700); transform: translateY(-1px); }

.btn-gold { background: var(--gold); color: #fff; }
.btn-gold:hover { background: #9C7830; transform: translateY(-1px); }

.btn-ghost { border: 1px solid var(--line); color: var(--navy-800); background: #fff; }
.btn-ghost:hover { border-color: var(--navy-800); }

.btn-ghost-light { border: 1px solid rgba(255,255,255,.35); color: #fff; }
.btn-ghost-light:hover { border-color: #fff; background: rgba(255,255,255,.08); }

.btn .arrow { transition: transform 240ms var(--ease); }
.btn:hover .arrow { transform: translateX(3px); }

/* 文本链接 */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--gold);
  font-weight: 600;
  font-size: 15px;
}
.link-arrow svg { transition: transform 240ms var(--ease); }
.link-arrow:hover svg { transform: translateX(3px); }

/* ---------- 4. 顶栏 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 240ms var(--ease), box-shadow 240ms var(--ease);
}
.site-header.scrolled {
  border-bottom-color: var(--line);
  box-shadow: 0 4px 24px rgba(11,31,51,.06);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 24px;
}

.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark {
  width: 34px; height: 34px;
  border-radius: 9px;
  background: var(--navy-800);
  display: grid;
  place-items: center;
  color: var(--gold);
  flex-shrink: 0;
}
.brand-name {
  font-size: 19px;
  font-weight: 800;
  letter-spacing: .12em;
  color: var(--navy-900);
  line-height: 1.1;
}
.brand-sub {
  display: block;
  font-size: 9px;
  font-weight: 600;
  letter-spacing: .32em;
  color: var(--gold);
  margin-top: 2px;
}

.main-nav { display: flex; align-items: center; gap: 30px; }
.main-nav > a:not(.btn) {
  font-size: 15px;
  font-weight: 500;
  color: var(--muted);
  padding: 6px 0;
  position: relative;
  transition: color 200ms var(--ease);
}
.main-nav > a:not(.btn):hover,
.main-nav > a.active { color: var(--navy-900); }
.main-nav > a:not(.btn)::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  background: var(--gold);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 240ms var(--ease);
}
.main-nav > a:not(.btn):hover::after,
.main-nav > a.active::after { transform: scaleX(1); }
.main-nav .nav-cta { margin-left: 6px; }

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px; height: 42px;
  padding: 10px;
  border-radius: 10px;
}
.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--navy-900);
  border-radius: 2px;
  transition: transform 240ms var(--ease), opacity 200ms var(--ease);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 语言切换 */
.lang-switch {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  overflow: hidden;
  flex-shrink: 0;
}
.lang-item {
  padding: 5px 12px;
  font-size: 12.5px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--muted);
  transition: all 200ms var(--ease);
}
.lang-item:hover { color: var(--navy-900); }
.lang-item.active { background: var(--navy-800); color: #fff; }
.lang-item.active:hover { color: #fff; }

/* ---------- 5. 首页 Hero ---------- */
.hero {
  padding: 104px 0 0;
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr .9fr;
  gap: 56px;
  align-items: center;
}
.hero h1 { margin-bottom: 20px; }
.hero h1 .gold-word { color: var(--gold); }
.hero .lead { font-size: 17px; max-width: 560px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 32px; }

/* Hero 服务轮播 */
.rotate-line { display: inline-block; }
@keyframes rotIn {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: none; }
}
.rotate-line.anim,
.hero-lead.anim,
.hero-side ul.anim { animation: rotIn 520ms var(--ease); }

.hero-tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 26px; }
.hero-tab {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--muted);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 16px;
  transition: all 240ms var(--ease);
}
.hero-tab:hover { border-color: var(--navy-800); color: var(--navy-900); }
.hero-tab.active { background: var(--navy-800); border-color: var(--navy-800); color: #fff; }

.hero-side {
  background: var(--navy-800);
  border-radius: 20px;
  padding: 36px 32px;
  color: #fff;
  position: relative;
}
.hero-side::before {
  content: "";
  position: absolute;
  top: -14px; right: 34px;
  width: 90px; height: 28px;
  background: var(--gold);
  border-radius: 8px 8px 0 0;
  opacity: .9;
}
.hero-side h3 { color: #fff; font-size: 15px; letter-spacing: .08em; margin-bottom: 20px; }
.hero-side ul { display: grid; gap: 14px; }
.hero-side li {
  display: flex;
  gap: 12px;
  font-size: 14.5px;
  line-height: 1.55;
  color: rgba(255,255,255,.88);
}
.hero-side li .num {
  flex-shrink: 0;
  width: 26px; height: 26px;
  border-radius: 50%;
  border: 1px solid rgba(178,138,62,.7);
  color: var(--gold);
  display: grid;
  place-items: center;
  font-size: 12px;
  font-weight: 700;
  margin-top: 2px;
}

/* 信任条 */
.trust-strip {
  margin-top: 72px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--bg-soft);
}
.trust-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 18px 56px;
  padding: 26px 0;
}
.trust-label { font-size: 13px; color: var(--faint); letter-spacing: .1em; }
.trust-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 600;
  color: var(--navy-700);
}
.trust-item svg { color: var(--gold); flex-shrink: 0; }

/* ---------- 6. 服务卡片 ---------- */
.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: 30px 28px;
  transition: transform 240ms var(--ease), box-shadow 240ms var(--ease), border-color 240ms var(--ease);
}
a.card:hover {
  transform: translateY(-4px);
  border-color: rgba(178,138,62,.55);
  box-shadow: 0 16px 40px rgba(11,31,51,.08);
}
.card-icon {
  width: 46px; height: 46px;
  border-radius: 12px;
  background: var(--gold-soft);
  color: var(--gold);
  display: grid;
  place-items: center;
  margin-bottom: 20px;
}
.card h3 { margin-bottom: 10px; }
.card p { font-size: 14.5px; color: var(--muted); flex-grow: 1; }
.card .card-foot { margin-top: 20px; display: flex; align-items: center; justify-content: space-between; }

/* 开发中卡片 */
.card-dev { cursor: default; background: var(--bg-soft); border-style: dashed; }
.card-dev:hover { transform: none; border-color: var(--line); box-shadow: none; }
.card-dev .card-icon { background: #EAEDF1; color: var(--faint); }
.card-dev h3 { color: var(--muted); }
.badge-dev {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  color: var(--faint);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 12px;
  letter-spacing: .04em;
}
.badge-dev::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #C7CDD6;
}

.badge-live {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 700;
  color: #fff;
  background: var(--gold);
  border-radius: 999px;
  padding: 4px 12px;
  letter-spacing: .04em;
}

/* ---------- 7. 内页 Hero / 面包屑 ---------- */
.page-hero {
  background: linear-gradient(180deg, var(--bg-soft) 0%, #fff 100%);
  border-bottom: 1px solid var(--line);
  padding: 64px 0 56px;
}
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
  color: var(--faint);
  margin-bottom: 24px;
}
.breadcrumb a:hover { color: var(--gold); }
.breadcrumb .sep { color: #C7CDD6; }
.breadcrumb .current { color: var(--muted); }
.page-hero h1 { margin-bottom: 14px; }
.page-hero .lead { max-width: 680px; }

/* ---------- 8. 法规卡片 / 内容卡 ---------- */
.reg-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.reg-card {
  background: #fff;
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  border-radius: 12px;
  padding: 26px 28px;
}
.reg-card .tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--navy-600);
  background: #E9EFF5;
  border-radius: 6px;
  padding: 3px 10px;
  margin-bottom: 12px;
}
.reg-card h3 { margin-bottom: 8px; font-size: 17px; }
.reg-card p { font-size: 14.5px; color: var(--muted); }

/* ---------- 9. 双栏（图文） ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.split-text p { color: var(--muted); margin-bottom: 14px; }
.split-text p:last-child { margin-bottom: 0; }
.check-list { display: grid; gap: 12px; margin-top: 22px; }
.check-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 15px;
  color: var(--ink);
}
.check-list li svg { color: var(--gold); flex-shrink: 0; margin-top: 4px; }
.split-panel {
  background: var(--navy-800);
  color: #fff;
  border-radius: 20px;
  padding: 40px 36px;
}
.split-panel h3 { color: #fff; margin-bottom: 18px; }
.split-panel p { color: rgba(255,255,255,.82); font-size: 14.5px; margin-bottom: 12px; }
.split-panel .quote-mark { color: var(--gold); font-size: 28px; line-height: 1; }
.split-panel .note {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid rgba(255,255,255,.18);
  font-size: 13px;
  color: rgba(255,255,255,.65);
}

/* ---------- 10. 流程步骤 ---------- */
.steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 22px; counter-reset: step; }
.step {
  position: relative;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: 26px 22px 22px;
}
.step::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  display: block;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .1em;
  color: var(--gold);
  margin-bottom: 14px;
}
.step h3 { font-size: 16px; margin-bottom: 8px; }
.step p { font-size: 13.5px; color: var(--muted); }
.step:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 34px;
  right: -14px;
  width: 12px; height: 12px;
  border-top: 2px solid #C7CDD6;
  border-right: 2px solid #C7CDD6;
  transform: rotate(45deg);
}

/* ---------- 11. FAQ ---------- */
.faq { max-width: 820px; margin: 0 auto; }
.faq-item {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color 200ms var(--ease);
}
.faq-item[open] { border-color: rgba(178,138,62,.5); }
.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 22px;
  cursor: pointer;
  font-size: 15.5px;
  font-weight: 600;
  color: var(--navy-900);
  list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary .faq-icon {
  flex-shrink: 0;
  width: 24px; height: 24px;
  border-radius: 50%;
  border: 1.5px solid #C7CDD6;
  position: relative;
  transition: all 240ms var(--ease);
}
.faq-item summary .faq-icon::before,
.faq-item summary .faq-icon::after {
  content: "";
  position: absolute;
  top: 50%; left: 50%;
  background: var(--muted);
  transform: translate(-50%, -50%);
  transition: all 240ms var(--ease);
}
.faq-item summary .faq-icon::before { width: 10px; height: 1.5px; }
.faq-item summary .faq-icon::after { width: 1.5px; height: 10px; }
.faq-item[open] summary .faq-icon { border-color: var(--gold); background: var(--gold); }
.faq-item[open] summary .faq-icon::before,
.faq-item[open] summary .faq-icon::after { background: #fff; }
.faq-item[open] summary .faq-icon::after { transform: translate(-50%, -50%) rotate(90deg); }
.faq-body { padding: 0 22px 20px; font-size: 14.5px; color: var(--muted); }
.faq-body p + p { margin-top: 8px; }

/* ---------- 12. CTA 横幅 ---------- */
.cta-band {
  background: var(--navy-800);
  border-radius: 20px;
  padding: 56px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
  position: relative;
  overflow: hidden;
}
.cta-band::after {
  content: "";
  position: absolute;
  right: -60px; top: -60px;
  width: 220px; height: 220px;
  border-radius: 50%;
  border: 26px solid rgba(178,138,62,.16);
  pointer-events: none;
}
.cta-band h2 { color: #fff; margin-bottom: 8px; }
.cta-band p { color: rgba(255,255,255,.78); font-size: 15px; }

/* ---------- 13. 页脚 ---------- */
.site-footer { background: var(--navy-900); color: rgba(255,255,255,.75); margin-top: 96px; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 48px;
  padding: 64px 24px 40px;
}
.footer-brand .brand-name { color: #fff; }
.footer-brand p { font-size: 13.5px; margin-top: 14px; max-width: 260px; color: rgba(255,255,255,.6); }
.footer-col h4 {
  color: #fff;
  font-size: 14px;
  letter-spacing: .08em;
  margin-bottom: 18px;
}
.footer-col ul { display: grid; gap: 10px; }
.footer-col a, .footer-col li {
  font-size: 13.5px;
  color: rgba(255,255,255,.62);
  transition: color 200ms var(--ease);
}
.footer-col a:hover { color: var(--gold); }
.footer-col .dev-tag { color: rgba(255,255,255,.35); cursor: default; }
.footer-col .ext::after { content: " ↗"; font-size: 11px; opacity: .7; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.1);
  padding: 20px 24px;
  font-size: 12.5px;
  color: rgba(255,255,255,.45);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  justify-content: space-between;
}

/* ---------- 14. 联系我们 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 40px; align-items: start; }
.contact-cards { display: grid; gap: 16px; }
.contact-card {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: 22px 24px;
}
.contact-card .card-icon { margin-bottom: 0; }
.contact-card h3 { font-size: 15.5px; margin-bottom: 4px; }
.contact-card p { font-size: 14px; color: var(--muted); word-break: break-all; }
.contact-card .placeholder { color: var(--faint); font-style: normal; }

/* 多邮箱列表 */
.email-list { display: inline-flex; flex-wrap: wrap; align-items: center; }
.email-list a { color: inherit; }
.email-list a:hover { color: var(--gold); }
.contact-card .email-list a { color: var(--navy-600); }

.form-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 36px 34px;
  box-shadow: 0 12px 36px rgba(11,31,51,.05);
}
.form-card h2 { font-size: 22px; margin-bottom: 6px; }
.form-card .form-note { font-size: 13.5px; color: var(--faint); margin-bottom: 24px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-field { display: grid; gap: 6px; }
.form-field.full { grid-column: 1 / -1; }
.form-field label { font-size: 13.5px; font-weight: 600; color: var(--navy-800); }
.form-field input,
.form-field select,
.form-field textarea {
  font-family: inherit;
  font-size: 14.5px;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
  background: var(--bg-soft);
  outline: none;
  transition: border-color 200ms var(--ease), background 200ms var(--ease);
  width: 100%;
}
.form-field textarea { resize: vertical; min-height: 110px; }
.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  border-color: var(--gold);
  background: #fff;
}
.form-field input::placeholder,
.form-field textarea::placeholder { color: #AEB6C2; }
.form-submit { margin-top: 22px; width: 100%; }
.form-hint {
  display: none;
  margin-top: 14px;
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 13.5px;
  background: var(--gold-soft);
  color: #7A5C1E;
  border: 1px solid rgba(178,138,62,.35);
}

/* ---------- 15. 关于我们 ---------- */
.about-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 48px; }
.stat {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: 28px 24px;
  text-align: center;
}
.stat .stat-num {
  font-size: 30px;
  font-weight: 800;
  color: var(--navy-800);
  letter-spacing: .02em;
}
.stat .stat-num em { font-style: normal; color: var(--gold); }
.stat .stat-label { font-size: 13.5px; color: var(--muted); margin-top: 6px; }

/* ---------- 16. 动效 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 500ms var(--ease), transform 500ms var(--ease);
}
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .rotate-line.anim, .hero-lead.anim, .hero-side ul.anim { animation: none; }
  * { transition-duration: .01ms !important; }
}

/* ---------- 17. 响应式 ---------- */
@media (max-width: 1024px) {
  .service-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(3, 1fr); }
  .step:nth-child(3)::after { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .split { grid-template-columns: 1fr; gap: 40px; }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .section { padding: 64px 0; }
  .hero { padding-top: 64px; }
  .reg-grid { grid-template-columns: 1fr; }
  .service-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .step::after { display: none !important; }
  .form-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: 1fr; }
  .cta-band { padding: 40px 28px; }

  /* 移动端导航 */
  .nav-toggle { display: flex; }
  .main-nav {
    position: fixed;
    top: 72px;
    left: 0; right: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 16px 32px rgba(11,31,51,.1);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 24px 24px;
    display: none;
  }
  .main-nav.open { display: flex; }
  .main-nav > a:not(.btn) {
    padding: 14px 4px;
    border-bottom: 1px solid var(--bg-soft);
    font-size: 16px;
  }
  .main-nav > a:not(.btn)::after { display: none; }
  .main-nav .nav-cta { margin: 18px 0 0; }
  .footer-grid { grid-template-columns: 1fr; gap: 36px; padding: 48px 24px 32px; }
  .footer-bottom { flex-direction: column; }
  .trust-inner { gap: 12px 32px; }
}