/* ==========================================================================
   河北脑智梦科技有限公司 · 官网设计系统
   Brand: 脑智梦 / NAOZHIMENG · 非侵入式脑机接口应用方案落地服务商
   ========================================================================== */

/* ---------- 1. Design Tokens ---------- */
:root {
  /* 品牌色：取自「脑智梦」Logo 标准色 */
  --brand-900: #06355E;
  --brand-800: #0A4E87;
  --brand-700: #0C5C9E;
  --brand-600: #0F69B3;
  --brand-500: #1580CC;
  --brand-400: #00A2E9;
  --brand-300: #6FC3EE;
  --brand-100: #D6EAF8;
  --brand-50:  #EFF7FD;

  /* 中性色 */
  --ink-900: #0B1A2A;
  --ink-800: #16293D;
  --ink-700: #253C55;
  --ink-500: #5A7391;
  --ink-400: #8499B0;
  --line:    #DEE9F2;
  --line-soft: #EDF4FA;
  --bg:      #FFFFFF;
  --bg-alt:  #F5FAFD;

  /* 语义色 */
  --ok:   #12A594;
  --warn: #E0823D;

  --grad-brand: linear-gradient(135deg, #0A4E87 0%, #0F69B3 45%, #00A2E9 100%);
  --grad-soft:  linear-gradient(160deg, #F0F8FE 0%, #FFFFFF 60%);

  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 24px;

  --shadow-xs: 0 1px 3px rgba(9, 48, 88, .05);
  --shadow-sm: 0 4px 14px rgba(9, 48, 88, .06);
  --shadow:    0 12px 34px rgba(9, 48, 88, .09);
  --shadow-lg: 0 26px 70px rgba(9, 48, 88, .14);

  --maxw: 1180px;
  --header-h: 72px;

  --font: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Hiragino Sans GB",
          "Source Han Sans SC", "Noto Sans CJK SC", -apple-system, BlinkMacSystemFont,
          "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

/* ---------- 2. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-700);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
h1, h2, h3, h4, h5 { margin: 0 0 .6em; color: var(--ink-900); line-height: 1.3; font-weight: 700; letter-spacing: -.01em; }
h1 { font-size: clamp(1.85rem, 4vw, 2.85rem); }
h2 { font-size: clamp(1.45rem, 2.8vw, 2.05rem); }
h3 { font-size: clamp(1.1rem, 1.8vw, 1.3rem); }
h4 { font-size: 1.02rem; }
p  { margin: 0 0 1em; }
a  { color: var(--brand-600); text-decoration: none; transition: color .18s; }
a:hover { color: var(--brand-400); }
img, svg { max-width: 100%; display: block; }
ul, ol { margin: 0 0 1em; padding-left: 1.25em; }
li { margin: .3em 0; }
strong { color: var(--ink-900); font-weight: 600; }
button { font-family: inherit; }
address { font-style: normal; }
:focus-visible { outline: 2px solid var(--brand-400); outline-offset: 3px; border-radius: 4px; }

/* ---------- 3. Layout ---------- */
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }
.section { padding: 82px 0; }
.section--tight { padding: 56px 0; }
.section--alt { background: var(--bg-alt); }
.section--brand { background: var(--grad-soft); }
.grid { display: grid; gap: 22px; }
/* 网格子项不得被内容的 min-content 宽度撑破容器
   （表格自带 min-width:560px，窄屏单列时会把轨道撑出横向滚动） */
.grid > * { min-width: 0; }
.g-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.g-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.g-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

/* ---------- 4. Headings & Text ---------- */
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .8rem; font-weight: 600; letter-spacing: .09em; text-transform: uppercase;
  color: var(--brand-600); background: var(--brand-50);
  border: 1px solid var(--brand-100); border-radius: 999px;
  padding: 6px 14px; margin-bottom: 16px;
}
.eyebrow::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--brand-400); }
.section-head { max-width: 780px; margin-bottom: 42px; }
.section-head--center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head p { color: var(--ink-500); font-size: 1.03rem; margin-bottom: 0; }
.lead { font-size: 1.1rem; color: var(--ink-500); }
.muted { color: var(--ink-500); }
.small { font-size: .89rem; }
.grad-text {
  background: var(--grad-brand);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}

/* ---------- 5. Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 26px; border-radius: 999px; border: 1px solid transparent;
  font-size: .96rem; font-weight: 600; cursor: pointer; white-space: nowrap;
  transition: transform .18s, box-shadow .18s, background .18s, color .18s, border-color .18s;
}
.btn-primary { background: var(--grad-brand); color: #fff; box-shadow: 0 8px 22px rgba(15, 105, 179, .28); }
.btn-primary:hover { color: #fff; transform: translateY(-2px); box-shadow: 0 14px 30px rgba(15, 105, 179, .34); }
.btn-ghost { background: #fff; color: var(--brand-700); border-color: var(--line); box-shadow: var(--shadow-xs); }
.btn-ghost:hover { color: var(--brand-600); border-color: var(--brand-300); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.btn-light { background: rgba(255,255,255,.14); color: #fff; border-color: rgba(255,255,255,.35); }
.btn-light:hover { background: rgba(255,255,255,.24); color: #fff; }
.btn-sm { padding: 9px 18px; font-size: .88rem; }
.btn-row { display: flex; flex-wrap: wrap; gap: 14px; }

/* ---------- 6. Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 60;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line-soft);
}
.site-header.is-scrolled { box-shadow: 0 6px 26px rgba(9, 48, 88, .08); }
.header-inner {
  height: var(--header-h); display: flex; align-items: center; gap: 28px;
}
.brand { display: flex; align-items: center; gap: 11px; flex-shrink: 0; }
.brand img { height: 38px; width: auto; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text b { font-size: 1.02rem; color: var(--ink-900); letter-spacing: .01em; }
.brand-text span { font-size: .68rem; color: var(--ink-400); letter-spacing: .16em; }
.main-nav { margin-left: auto; display: flex; align-items: center; gap: 4px; }
.main-nav a {
  padding: 9px 13px; border-radius: 9px; font-size: .94rem; font-weight: 500;
  color: var(--ink-700); white-space: nowrap; transition: background .16s, color .16s;
}
.main-nav a:hover { background: var(--brand-50); color: var(--brand-600); }
.main-nav a.is-active { color: var(--brand-600); background: var(--brand-50); font-weight: 600; }
.header-cta { margin-left: 14px; }
.nav-toggle {
  display: none; margin-left: auto; width: 44px; height: 44px;
  border: 1px solid var(--line); background: #fff; border-radius: 11px;
  align-items: center; justify-content: center; cursor: pointer;
}
.nav-toggle span { display: block; width: 19px; height: 2px; background: var(--ink-800); border-radius: 2px; position: relative; }
.nav-toggle span::before, .nav-toggle span::after {
  content: ""; position: absolute; left: 0; width: 19px; height: 2px; background: var(--ink-800); border-radius: 2px;
}
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }

/* ---------- 7. Hero ---------- */
.hero {
  position: relative; overflow: hidden; padding: 74px 0 78px;
  background:
    radial-gradient(900px 460px at 88% -8%, rgba(0, 162, 233, .13), transparent 62%),
    radial-gradient(700px 420px at 4% 8%, rgba(15, 105, 179, .09), transparent 60%),
    linear-gradient(180deg, #F6FBFF 0%, #FFFFFF 72%);
}
.hero::after {
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .5;
  background-image: radial-gradient(rgba(15, 105, 179, .13) 1px, transparent 1px);
  background-size: 26px 26px;
  mask-image: linear-gradient(180deg, #000 0%, transparent 62%);
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 62%);
}
.hero-inner { position: relative; z-index: 1; display: grid; grid-template-columns: 1.08fr .92fr; gap: 54px; align-items: center; }
.hero h1 { margin-bottom: 18px; }
.hero .lead { font-size: 1.09rem; max-width: 560px; }
.hero-trust { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }
.chip {
  display: inline-flex; align-items: center; gap: 7px; font-size: .84rem; font-weight: 500;
  color: var(--ink-700); background: #fff; border: 1px solid var(--line);
  border-radius: 999px; padding: 7px 14px; box-shadow: var(--shadow-xs);
}
.chip::before { content: "✓"; color: var(--brand-400); font-weight: 700; font-size: .8rem; }

/* Hero 视觉区 */
.hero-visual { position: relative; }
.device-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); padding: 22px; overflow: hidden;
}
.device-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.device-title { font-size: .82rem; font-weight: 600; letter-spacing: .07em; color: var(--ink-400); text-transform: uppercase; }
.dot-row { display: flex; gap: 5px; }
.dot-row i { width: 8px; height: 8px; border-radius: 50%; background: var(--brand-100); display: block; }
.dot-row i:first-child { background: var(--brand-300); }
.eeg-wrap { background: linear-gradient(180deg, #F3F9FE, #FBFDFF); border: 1px solid var(--line-soft); border-radius: var(--radius); padding: 14px 10px; }
.eeg-line { fill: none; stroke: url(#eegGrad); stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }
.eeg-line--2 { opacity: .38; stroke-width: 1.6; animation-duration: 9s; animation-direction: reverse; }
@keyframes dash { to { stroke-dashoffset: -1200; } }
.eeg-anim { stroke-dasharray: 12 6; animation: dash 18s linear infinite; }
.metric-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 16px; }
.metric {
  background: var(--brand-50); border: 1px solid var(--brand-100);
  border-radius: 12px; padding: 11px 12px;
}
.metric b { display: block; font-size: 1.22rem; color: var(--brand-700); line-height: 1.2; font-variant-numeric: tabular-nums; }
.metric span { font-size: .74rem; color: var(--ink-500); }
.float-card {
  position: absolute; background: #fff; border: 1px solid var(--line);
  border-radius: 14px; box-shadow: var(--shadow); padding: 11px 15px;
  display: flex; align-items: center; gap: 10px; font-size: .82rem; font-weight: 600; color: var(--ink-800);
  animation: floaty 5.6s ease-in-out infinite;
}
.float-card i { width: 9px; height: 9px; border-radius: 50%; background: var(--ok); display: block; box-shadow: 0 0 0 4px rgba(18,165,148,.14); }
.float-card--a { top: -20px; left: -26px; }
.float-card--b { bottom: -18px; right: -18px; animation-delay: 1.6s; }
.float-card--b i { background: var(--brand-400); box-shadow: 0 0 0 4px rgba(0,162,233,.16); }
@keyframes floaty { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-9px); } }

/* ---------- 8. Stats band ---------- */
.stat-band { background: var(--grad-brand); color: #fff; padding: 46px 0; }
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 26px; text-align: center; }
.stat b { display: block; font-size: clamp(1.75rem, 3.2vw, 2.4rem); font-weight: 700; line-height: 1.15; font-variant-numeric: tabular-nums; }
.stat span { font-size: .88rem; color: rgba(255,255,255,.82); }
.stat + .stat { border-left: 1px solid rgba(255,255,255,.2); }

/* ---------- 9. Cards ---------- */
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; box-shadow: var(--shadow-xs);
  transition: transform .2s, box-shadow .2s, border-color .2s;
  position: relative; overflow: hidden;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: var(--brand-100); }
.card h3 { margin-bottom: .45em; }
.card p:last-child { margin-bottom: 0; }
.card-link {
  display: inline-flex; align-items: center; gap: 6px; margin-top: 14px;
  font-size: .9rem; font-weight: 600; color: var(--brand-600);
}
.card-link::after { content: "→"; transition: transform .18s; }
.card:hover .card-link::after { transform: translateX(4px); }
.card-icon {
  width: 48px; height: 48px; border-radius: 13px; display: grid; place-items: center;
  background: var(--brand-50); border: 1px solid var(--brand-100); margin-bottom: 16px;
}
.card-icon svg { width: 24px; height: 24px; stroke: var(--brand-600); fill: none; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.card--brand { background: var(--grad-soft); border-color: var(--brand-100); }
.card-top-line { position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--grad-brand); opacity: 0; transition: opacity .2s; }
.card:hover .card-top-line { opacity: 1; }

/* ---------- 10. Feature list ---------- */
.feature { display: flex; gap: 14px; align-items: flex-start; }
.feature-num {
  flex-shrink: 0; width: 34px; height: 34px; border-radius: 10px;
  background: var(--brand-600); color: #fff; display: grid; place-items: center;
  font-size: .9rem; font-weight: 700;
}
.feature h4 { margin-bottom: .25em; }
.feature p { margin-bottom: 0; font-size: .94rem; color: var(--ink-500); }

/* ---------- 11. Page hero (内页) ---------- */
.page-hero {
  position: relative; padding: 64px 0 58px; overflow: hidden;
  background:
    radial-gradient(760px 380px at 92% -20%, rgba(0, 162, 233, .14), transparent 60%),
    linear-gradient(180deg, #F4FAFF 0%, #FFFFFF 100%);
  border-bottom: 1px solid var(--line-soft);
}
.page-hero h1 { margin-bottom: 14px; }
.page-hero .lead { max-width: 720px; }
.breadcrumb { font-size: .85rem; color: var(--ink-400); margin-bottom: 18px; }
.breadcrumb a { color: var(--ink-500); }
.breadcrumb a:hover { color: var(--brand-600); }
.breadcrumb span { margin: 0 7px; opacity: .6; }

/* ---------- 12. Checklist / 列表 ---------- */
.check-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.check-list li { position: relative; padding-left: 28px; font-size: .95rem; color: var(--ink-700); }
.check-list li::before {
  content: "✓"; position: absolute; left: 0; top: 0;
  width: 18px; height: 18px; border-radius: 50%; background: var(--brand-50);
  color: var(--brand-600); font-size: .72rem; display: grid; place-items: center; font-weight: 700;
}

/* ---------- 事实清单（标签 + 内容两列）与简介面板 ---------- */
.summary-box {
  border: 1px solid var(--line); border-left: 4px solid var(--brand-600);
  border-radius: var(--radius); background: #fff; padding: 30px 34px;
}
.summary-box > h2:first-child { margin-top: 0; }
.summary-box > p:last-child { margin-bottom: 0; }
ul.facts {
  list-style: none; padding: 0; margin: 20px 0 0;
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  overflow: hidden; background: #fff;
}
ul.facts li {
  display: grid; grid-template-columns: 170px 1fr; gap: 16px; align-items: baseline;
  padding: 11px 18px; font-size: .94rem; border-top: 1px solid var(--line-soft);
}
ul.facts li:first-child { border-top: 0; }
ul.facts li b { color: var(--brand-800); font-weight: 600; line-height: 1.5; }
ul.facts li span { color: var(--ink-700); line-height: 1.6; }
ul.facts li a { color: var(--brand-600); }
@media (max-width: 620px) {
  .summary-box { padding: 24px 20px; }
  ul.facts li { grid-template-columns: 1fr; gap: 4px; }
}
.tag-list { display: flex; flex-wrap: wrap; gap: 9px; padding: 0; margin: 0; list-style: none; }
.tag {
  font-size: .84rem; color: var(--brand-700); background: var(--brand-50);
  border: 1px solid var(--brand-100); border-radius: 8px; padding: 6px 12px;
}
.tag--plain { background: #fff; color: var(--ink-700); border-color: var(--line); }

/* ---------- 13. 表格 ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
table { width: 100%; border-collapse: collapse; min-width: 560px; }
th, td { padding: 14px 18px; text-align: left; font-size: .93rem; border-bottom: 1px solid var(--line-soft); vertical-align: top; }
th { background: var(--brand-50); color: var(--brand-800); font-weight: 600; font-size: .88rem; letter-spacing: .02em; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: #FAFCFF; }
td strong { color: var(--ink-900); }

/* ---------- 14. 场景 / 时间线 ---------- */
.persona { border-left: 3px solid var(--brand-300); padding-left: 16px; margin-bottom: 18px; }
.persona h4 { margin-bottom: .2em; }
.persona p { margin-bottom: 0; font-size: .93rem; color: var(--ink-500); }
.timeline { position: relative; padding-left: 26px; }
.timeline::before { content: ""; position: absolute; left: 5px; top: 6px; bottom: 6px; width: 2px; background: var(--brand-100); }
.timeline-item { position: relative; padding-bottom: 26px; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: ""; position: absolute; left: -26px; top: 7px; width: 12px; height: 12px;
  border-radius: 50%; background: #fff; border: 3px solid var(--brand-400);
}
.timeline-item time { font-size: .84rem; font-weight: 700; color: var(--brand-600); letter-spacing: .04em; }
.timeline-item h4 { margin: .15em 0 .25em; }
.timeline-item p { margin-bottom: 0; font-size: .93rem; color: var(--ink-500); }

/* ---------- 15. FAQ 手风琴 ---------- */
.faq-list { display: grid; gap: 12px; }
.faq-item { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; transition: border-color .2s, box-shadow .2s; }
.faq-item[open] { border-color: var(--brand-300); box-shadow: var(--shadow-sm); }
.faq-item summary {
  list-style: none; cursor: pointer; padding: 18px 52px 18px 22px; position: relative;
  font-weight: 600; color: var(--ink-900); font-size: 1rem; transition: color .16s;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary:hover { color: var(--brand-600); }
.faq-item summary::after {
  content: ""; position: absolute; right: 22px; top: 50%; width: 10px; height: 10px;
  border-right: 2px solid var(--brand-500); border-bottom: 2px solid var(--brand-500);
  transform: translateY(-70%) rotate(45deg); transition: transform .22s;
}
.faq-item[open] summary::after { transform: translateY(-30%) rotate(-135deg); }
.faq-item[open] summary { color: var(--brand-700); }
.faq-body { padding: 0 22px 20px; color: var(--ink-500); font-size: .96rem; border-top: 1px solid var(--line-soft); padding-top: 16px; }
.faq-body p:last-child { margin-bottom: 0; }
.faq-group-title { margin: 44px 0 18px; padding-left: 14px; border-left: 4px solid var(--brand-400); font-size: 1.12rem; }
.faq-group-title:first-of-type { margin-top: 0; }

/* ---------- 16. CTA band ---------- */
.cta-band {
  position: relative; overflow: hidden; color: #fff; border-radius: var(--radius-lg);
  background: var(--grad-brand); padding: 50px 46px;
  display: flex; align-items: center; justify-content: space-between; gap: 34px; flex-wrap: wrap;
}
.cta-band::after {
  content: ""; position: absolute; right: -70px; top: -70px; width: 300px; height: 300px;
  border-radius: 50%; background: rgba(255,255,255,.09);
}
.cta-band h2 { color: #fff; margin-bottom: .3em; }
.cta-band p { color: rgba(255,255,255,.86); margin-bottom: 0; max-width: 620px; }
.cta-actions { position: relative; z-index: 1; display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- 17. 图库 ---------- */
.gallery { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.gallery figure { margin: 0; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); background: #fff; }
.gallery img { width: 100%; height: 230px; object-fit: cover; transition: transform .4s; }
.gallery figure:hover img { transform: scale(1.045); }
.gallery figcaption { padding: 12px 16px; font-size: .87rem; color: var(--ink-500); }

/* ---------- 18. 合作伙伴 ---------- */
.partner-strip { display: flex; flex-wrap: wrap; align-items: center; gap: 18px; }
.partner-logo {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px 28px; display: grid; place-items: center; min-height: 96px; min-width: 190px;
  box-shadow: var(--shadow-xs);
}
.partner-logo img { max-height: 46px; width: auto; }
.partner-tag { display: block; margin-top: 10px; font-size: .74rem; letter-spacing: .06em; color: var(--ink-400, #6B8299); font-weight: 600; text-align: center; }

/* ---------- 19. 联系信息 ---------- */
.contact-card { display: flex; gap: 14px; align-items: flex-start; }
.contact-card .card-icon { margin-bottom: 0; }
.contact-card h4 { margin-bottom: .2em; }
.contact-card p { margin-bottom: 0; font-size: .93rem; color: var(--ink-500); }
.contact-card a { font-weight: 600; }
.map-embed { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--brand-50); min-height: 300px; display: grid; place-items: center; text-align: center; padding: 30px; }

/* ---------- 20. Footer ---------- */
.site-footer { background: #08243D; color: rgba(255,255,255,.72); padding: 60px 0 26px; margin-top: 0; font-size: .92rem; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 40px; }
.site-footer h4 { color: #fff; font-size: .95rem; margin-bottom: 16px; letter-spacing: .04em; }
.site-footer a { color: rgba(255,255,255,.72); }
.site-footer a:hover { color: #fff; }
.footer-logo { background: #fff; border-radius: 12px; padding: 12px 16px; display: inline-block; margin-bottom: 18px; }
.footer-logo img { height: 34px; width: auto; }
.footer-links { list-style: none; padding: 0; margin: 0; }
.footer-links li { margin: .5em 0; }
.footer-bottom {
  margin-top: 44px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.13);
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  font-size: .85rem; color: rgba(255,255,255,.55);
}
.footer-bottom p { margin: 0; }

/* ---------- 21. 动效 ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .65s cubic-bezier(.22,.61,.36,1), transform .65s cubic-bezier(.22,.61,.36,1); }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .eeg-anim, .float-card { animation: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 22. 响应式 ---------- */
@media (max-width: 1080px) {
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .hero-visual { max-width: 560px; }
  .float-card--a { left: 2px; }
  .float-card--b { right: 2px; }
  .main-nav a { padding: 9px 10px; font-size: .9rem; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 30px; }
}
@media (max-width: 900px) {
  .g-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .g-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stat-grid { grid-template-columns: repeat(2, 1fr); gap: 30px 20px; }
  .stat + .stat { border-left: 0; }
  .stat:nth-child(even) { border-left: 1px solid rgba(255,255,255,.2); }
  .gallery { grid-template-columns: repeat(2, 1fr); }
  .nav-toggle { display: flex; }
  .main-nav {
    position: absolute; top: var(--header-h); left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 2px;
    background: #fff; border-bottom: 1px solid var(--line);
    padding: 14px 22px 20px; box-shadow: var(--shadow);
    display: none;
  }
  .main-nav.is-open { display: flex; }
  .main-nav a { padding: 12px 14px; font-size: 1rem; }
  .header-cta { display: none; }
  .main-nav .nav-cta-mobile { display: inline-flex; margin-top: 10px; }
}
@media (max-width: 720px) {
  .section { padding: 58px 0; }
  .g-2, .g-3, .g-4 { grid-template-columns: minmax(0, 1fr); }
  .hero { padding: 52px 0 58px; }
  .float-card--a { left: 4px; top: -14px; }
  .float-card--b { right: 4px; bottom: -12px; }
  .cta-band { padding: 36px 26px; }
  .gallery { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 26px; }
  .metric-row { grid-template-columns: 1fr; }
  .brand-text span { display: none; }
}
@media (max-width: 520px) {
  .stat-grid { grid-template-columns: 1fr; }
  .stat:nth-child(even) { border-left: 0; }
  .section-head { margin-bottom: 30px; }
}
/* ---------- 22b. 表单 ---------- */
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.field { display: block; margin-bottom: 16px; }
.field > span { display: block; font-size: .88rem; font-weight: 600; color: var(--ink-800); margin-bottom: 7px; }
.field input, .field select, .field textarea {
  width: 100%; padding: 12px 14px; border: 1px solid var(--line); border-radius: 11px;
  font-family: inherit; font-size: .95rem; color: var(--ink-900); background: #fff;
  transition: border-color .18s, box-shadow .18s;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--brand-400); box-shadow: 0 0 0 4px rgba(0, 162, 233, .13);
}
.field textarea { resize: vertical; min-height: 112px; }
.form-note { font-size: .86rem; color: var(--ink-500); margin: 14px 0 0; }
.form-status { margin-top: 14px; font-size: .9rem; font-weight: 600; color: var(--ok); display: none; }
.form-status.is-on { display: block; }
.form-status.is-err { color: #C0392B; }
.form-note--legal { font-size: .84rem; line-height: 1.7; color: var(--ink-500); margin: 14px 0 0; padding-left: 11px; border-left: 3px solid #DCE6F0; }
.btn[disabled] { opacity: .72; cursor: not-allowed; }
@media (max-width: 720px) { .form-grid { grid-template-columns: 1fr; } }

/* ---------- 23. 二级导航 ---------- */
.nav-item { position: relative; }
.nav-item > a.is-parent::after { content: "▾"; font-size: .62rem; margin-left: 5px; opacity: .55; display: inline-block; }
.submenu {
  position: absolute; top: calc(100% + 8px); left: 50%;
  transform: translateX(-50%) translateY(6px);
  background: #fff; border: 1px solid var(--line); border-radius: 14px;
  box-shadow: var(--shadow); padding: 8px; min-width: 236px; z-index: 70;
  opacity: 0; visibility: hidden;
  transition: opacity .18s, transform .18s, visibility .18s;
}
.submenu a { display: block; border-radius: 9px; padding: 10px 14px; font-size: .93rem; color: var(--ink-700); }
.submenu a b { display: block; font-weight: 600; font-size: .94rem; }
.submenu a small { display: block; font-size: .77rem; color: var(--ink-400); font-weight: 400; line-height: 1.5; margin-top: 1px; }
.submenu a:hover { background: var(--brand-50); }
.nav-item:hover > .submenu,
.nav-item:focus-within > .submenu,
.nav-item.is-open > .submenu { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.nav-cta-mobile { display: none; }
@media (max-width: 1080px) {
  .submenu { min-width: 210px; }
}
@media (max-width: 900px) {
  .submenu {
    position: static; transform: none; opacity: 1; visibility: visible;
    box-shadow: none; border: 0; background: transparent; padding: 2px 0 4px 14px;
    min-width: 0; display: none; border-left: 2px solid var(--brand-100); margin-left: 14px;
  }
  .nav-item.is-open > .submenu { display: block; }
  .nav-item:hover > .submenu { transform: none; }
  .submenu a { padding: 9px 12px; font-size: .95rem; }
  .nav-item > a.is-parent { display: flex; align-items: center; justify-content: space-between; }
}