/* ============================================================
   Linkora · 灵桥 — 干净高级的产品落地页设计系统
   深色优先，light 模式同样保持克制高级。
   品牌：indigo #6366F1 → cyan #22D3EE
   注意：本文件保持纯 CSS，不使用任何模板语法。
   ============================================================ */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 88px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
               "PingFang SC", "Microsoft YaHei", "Noto Sans SC",
               "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  background-color: var(--bg);
  color: var(--text);
  transition: background-color .4s ease, color .4s ease;
}

a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
ul { list-style: none; }

::selection {
  background: rgba(99, 102, 241, .35);
  color: #fff;
}

/* ---------- Design Tokens ---------- */
:root {
  /* 品牌 */
  --indigo: #6366f1;
  --violet: #818cf8;
  --cyan: #22d3ee;
  --accent-grad: linear-gradient(135deg, #818cf8 0%, #22d3ee 100%);
  --accent-grad-soft: linear-gradient(135deg, rgba(129,140,248,.16), rgba(34,211,238,.14));

  /* 深色默认 */
  --bg: #05070d;
  --bg-2: #0a0f1c;
  --bg-3: #111a2e;
  --text: #f6f8ff;
  --text-2: #aab4cc;
  --text-3: #6b7691;
  --hair: rgba(255,255,255,.08);
  --hair-strong: rgba(255,255,255,.14);

  --glass: rgba(255,255,255,.035);
  --glass-2: rgba(255,255,255,.055);
  --glass-border: rgba(255,255,255,.09);
  --glass-blur: 18px;

  --nav-bg: rgba(5,7,13,.72);
  --nav-border: rgba(255,255,255,.07);

  --shadow-sm: 0 2px 10px rgba(0,0,0,.3);
  --shadow-md: 0 18px 50px -12px rgba(0,0,0,.55);
  --shadow-glow: 0 0 0 1px rgba(99,102,241,.25), 0 20px 60px -20px rgba(99,102,241,.4);

  --ok: #34d399;
  --warn: #fbbf24;
  --info: #38bdf8;

  --maxw: 1160px;
  --maxw-narrow: 760px;
  --nav-h: 68px;
  --radius: 18px;
  --radius-lg: 24px;
  --radius-sm: 12px;

  --ease: cubic-bezier(.22, 1, .36, 1);
  --ease-out: cubic-bezier(.16, 1, .3, 1);
}

:root[data-theme="light"] {
  --bg: #f8fafc;
  --bg-2: #f1f5f9;
  --bg-3: #ffffff;
  --text: #0f172a;
  --text-2: #475569;
  --text-3: #94a3b8;
  --hair: rgba(15,23,42,.09);
  --hair-strong: rgba(15,23,42,.16);

  --glass: rgba(255,255,255,.65);
  --glass-2: rgba(241,245,249,.9);
  --glass-border: rgba(15,23,42,.08);

  --nav-bg: rgba(248,250,252,.78);
  --nav-border: rgba(15,23,42,.07);

  --shadow-sm: 0 2px 10px rgba(15,23,42,.06);
  --shadow-md: 0 22px 55px -16px rgba(15,23,42,.18);
  --shadow-glow: 0 0 0 1px rgba(99,102,241,.18), 0 22px 60px -22px rgba(99,102,241,.28);
}

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 24px;
}

.container--narrow { max-width: var(--maxw-narrow); }

.section {
  position: relative;
  padding: clamp(72px, 11vw, 130px) 0;
}

.section__head {
  max-width: 720px;
  margin: 0 auto clamp(40px, 6vw, 68px);
  text-align: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 650;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--cyan);
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--accent-grad-soft);
  border: 1px solid var(--glass-border);
  margin-bottom: 18px;
}

.section__title {
  font-size: clamp(30px, 4.6vw, 48px);
  line-height: 1.1;
  font-weight: 720;
  letter-spacing: -.025em;
  margin-bottom: 16px;
}

.section__sub {
  font-size: clamp(15px, 2vw, 18px);
  color: var(--text-2);
  line-height: 1.7;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  font-size: 15px;
  font-weight: 600;
  padding: 13px 24px;
  border-radius: 999px;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease),
    background .25s ease, border-color .25s ease, color .25s ease;
  will-change: transform;
  white-space: nowrap;
}

.btn svg { width: 18px; height: 18px; flex: none; }

.btn--primary {
  color: #06121f;
  background: var(--accent-grad);
  box-shadow: var(--shadow-glow);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 0 1px rgba(99, 102, 241, .35), 0 26px 70px -18px rgba(34, 211, 238, .55);
}

.btn--glass {
  color: var(--text);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
}

.btn--glass:hover {
  transform: translateY(-2px);
  background: var(--glass-2);
  border-color: var(--hair-strong);
}

.btn--ghost {
  color: var(--text-2);
  padding-inline: 14px;
}

.btn--ghost:hover { color: var(--text); }

.btn--lg { font-size: 16px; padding: 16px 30px; }

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--nav-h);
  z-index: 100;
  display: flex;
  align-items: center;
  background: transparent;
  transition: background .35s ease, border-color .35s ease, backdrop-filter .35s ease;
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  background: var(--nav-bg);
  border-bottom-color: var(--nav-border);
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
}

.nav__inner {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 24px;
  display: flex;
  align-items: center;
  gap: 22px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 720;
  font-size: 17px;
  letter-spacing: -.01em;
}

.brand__mark {
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: var(--accent-grad);
  display: grid;
  place-items: center;
  box-shadow: 0 6px 18px -4px rgba(99, 102, 241, .5);
}

.brand__mark svg { width: 19px; height: 19px; }

.brand__name b { color: var(--text); }
.brand__name span { color: var(--text-3); font-weight: 500; }

.nav__links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.nav__links a {
  font-size: 14.5px;
  font-weight: 500;
  color: var(--text-2);
  padding: 8px 14px;
  border-radius: 10px;
  transition: color .2s ease, background .2s ease;
}

.nav__links a:hover { color: var(--text); background: var(--glass); }

.nav__actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* 主题分段切换 */
.theme-seg {
  display: inline-flex;
  align-items: center;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  padding: 3px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.theme-seg button {
  width: 34px;
  height: 30px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  color: var(--text-3);
  transition: color .2s ease, background .2s ease, transform .2s ease;
}

.theme-seg button svg { width: 15px; height: 15px; }

.theme-seg button[aria-pressed="true"] {
  background: var(--accent-grad);
  color: #06121f;
  box-shadow: 0 3px 10px -3px rgba(99,102,241,.5);
}

.theme-seg button:hover:not([aria-pressed="true"]) { color: var(--text); }

.burger {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: 11px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  place-items: center;
}

.burger span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  position: relative;
  transition: transform .3s var(--ease), opacity .2s ease;
}

.burger span::before,
.burger span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform .3s var(--ease);
}

.burger span::before { top: -6px; }
.burger span::after { top: 6px; }

.burger.open span { background: transparent; }
.burger.open span::before { transform: translateY(6px) rotate(45deg); }
.burger.open span::after { transform: translateY(-6px) rotate(-45deg); }

/* 移动菜单 */
.mobile-menu {
  position: fixed;
  inset: var(--nav-h) 0 auto 0;
  z-index: 99;
  background: var(--nav-bg);
  backdrop-filter: blur(22px) saturate(160%);
  -webkit-backdrop-filter: blur(22px) saturate(160%);
  border-bottom: 1px solid var(--nav-border);
  padding: 16px 24px 26px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transform: translateY(-12px);
  opacity: 0;
  pointer-events: none;
  transition: transform .3s var(--ease), opacity .3s ease;
}

.mobile-menu.open { transform: translateY(0); opacity: 1; pointer-events: auto; }

.mobile-menu a {
  font-size: 16px;
  font-weight: 500;
  color: var(--text-2);
  padding: 13px 14px;
  border-radius: 12px;
  transition: background .2s ease, color .2s ease;
}

.mobile-menu a:hover { background: var(--glass); color: var(--text); }

.mobile-menu .btn { margin-top: 10px; }

/* Light mode hero adjustments */
:root[data-theme="light"] .hero__bg::before,
:root[data-theme="light"] .hero__bg::after {
  opacity: .14;
}

:root[data-theme="light"] .hero__grid {
  opacity: .28;
}

:root[data-theme="light"] .hero__canvas {
  opacity: 0;
  pointer-events: none;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: calc(var(--nav-h) + clamp(70px, 11vw, 150px)) 0 clamp(70px, 10vw, 130px);
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: -2;
  pointer-events: none;
}

.hero__bg::before,
.hero__bg::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: .45;
  will-change: transform;
}

.hero__bg::before {
  width: 680px;
  height: 680px;
  top: -200px;
  left: -120px;
  background: radial-gradient(circle, rgba(99, 102, 241, .5), transparent 65%);
  animation: aurora-a 18s var(--ease) infinite alternate;
}

.hero__bg::after {
  width: 600px;
  height: 600px;
  top: -100px;
  right: -140px;
  background: radial-gradient(circle, rgba(34, 211, 238, .38), transparent 65%);
  animation: aurora-b 22s var(--ease) infinite alternate;
}

.hero__grid {
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, var(--hair) 1px, transparent 1px),
    linear-gradient(to bottom, var(--hair) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 75%);
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 75%);
  opacity: .55;
}

.hero__canvas {
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: clamp(32px, 5vw, 64px);
  align-items: center;
}

.hero__copy { position: relative; z-index: 1; }

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text);
  padding: 7px 15px 7px 8px;
  border-radius: 999px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  margin-bottom: 26px;
}

.hero__badge .tag {
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .04em;
  color: #06121f;
  background: var(--accent-grad);
  padding: 3px 9px;
  border-radius: 999px;
}

.hero__title {
  font-size: clamp(40px, 6.6vw, 74px);
  line-height: 1.05;
  font-weight: 780;
  letter-spacing: -.035em;
  margin-bottom: 24px;
}

.hero__title .grad {
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__sub {
  font-size: clamp(16px, 2.2vw, 19px);
  color: var(--text-2);
  line-height: 1.72;
  max-width: 520px;
  margin-bottom: 14px;
}

.hero__sub b { color: var(--text); font-weight: 650; }

.hero__desc {
  font-size: clamp(14px, 1.9vw, 16.5px);
  color: var(--text-3);
  line-height: 1.74;
  max-width: 540px;
  margin-bottom: 34px;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 32px;
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 26px;
  font-size: 13.5px;
  color: var(--text-3);
}

.hero__meta span { display: inline-flex; align-items: center; gap: 7px; }
.hero__meta svg { width: 16px; height: 16px; color: var(--cyan); }

/* ---------- 对话流 mock ---------- */
.demo {
  position: relative;
  border-radius: var(--radius-lg);
  background: var(--bg-3);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.demo::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: var(--accent-grad);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: .45;
  pointer-events: none;
}

.demo__bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--hair);
  background: var(--glass-2);
}

.demo__dots { display: flex; gap: 6px; }
.demo__dots i { width: 11px; height: 11px; border-radius: 50%; background: var(--hair-strong); }
.demo__dots i:nth-child(1) { background: #ff5f57; }
.demo__dots i:nth-child(2) { background: #febc2e; }
.demo__dots i:nth-child(3) { background: #28c840; }

.demo__title { font-size: 13.5px; font-weight: 600; color: var(--text-2); margin-left: 6px; }

.demo__pill {
  margin-left: auto;
  font-size: 11px;
  font-weight: 600;
  color: var(--ok);
  background: rgba(52, 211, 153, .12);
  border: 1px solid rgba(52, 211, 153, .3);
  padding: 3px 10px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.demo__pill::before {
  content: "";
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 8px var(--ok);
}

.demo__body {
  padding: 22px 18px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-height: 380px;
  overflow-y: auto;
}

.demo__body::-webkit-scrollbar { width: 6px; }
.demo__body::-webkit-scrollbar-track { background: transparent; }
.demo__body::-webkit-scrollbar-thumb {
  background: var(--hair-strong);
  border-radius: 999px;
}
.demo__body::-webkit-scrollbar-thumb:hover { background: var(--text-3); }

.msg {
  display: flex;
  gap: 11px;
  align-items: flex-end;
  max-width: 88%;
}

.msg__avatar {
  width: 34px; height: 34px;
  border-radius: 11px;
  flex: none;
  display: grid; place-items: center;
  font-size: 14px; font-weight: 700;
  color: #06121f;
}

.msg--user { align-self: flex-end; flex-direction: row-reverse; }
.msg--user .msg__avatar { background: linear-gradient(135deg, #c4b5fd, #a5b4fc); }
.msg--bot .msg__avatar { background: var(--accent-grad); }
.msg--human .msg__avatar { background: linear-gradient(135deg, #fda4af, #fb7185); }

.msg__bubble {
  padding: 11px 15px;
  border-radius: 16px;
  font-size: 14px;
  line-height: 1.6;
  background: var(--glass-2);
  border: 1px solid var(--glass-border);
  color: var(--text);
  box-shadow: 0 1px 2px rgba(0,0,0,.04);
}

.msg__bubble strong { color: var(--accent); font-weight: 600; }

.msg--user .msg__bubble {
  background: rgba(129, 140, 248, .18);
  border-color: rgba(129, 140, 248, .32);
}

.msg--bot .msg__bubble {
  border-left: 3px solid var(--accent);
}

.msg__meta { font-size: 11px; color: var(--text-3); margin-top: 4px; padding-inline: 4px; }
.msg--user .msg__meta { text-align: right; }

.gate-note {
  align-self: center;
  margin-top: 2px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-2);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  padding: 8px 14px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.gate-note svg { width: 15px; height: 15px; color: var(--cyan); }

/* ---------- Stats ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-top: clamp(40px, 6vw, 70px);
}

.stat {
  text-align: center;
  padding: 26px 16px;
  border-radius: var(--radius);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
}

.stat__num {
  font-size: clamp(30px, 4.6vw, 46px);
  font-weight: 780;
  letter-spacing: -.03em;
  background: var(--accent-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1;
}

.stat__label { font-size: 13.5px; color: var(--text-2); margin-top: 9px; }

/* ---------- Feature grid ---------- */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  position: relative;
  padding: 28px 26px;
  border-radius: var(--radius);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  transition: transform .35s var(--ease), border-color .35s ease, box-shadow .35s ease, background .35s ease;
  overflow: hidden;
}

.feature-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(420px circle at var(--mx, 50%) var(--my, 0%), rgba(99, 102, 241, .12), transparent 60%);
  opacity: 0;
  transition: opacity .4s ease;
  pointer-events: none;
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--hair-strong);
  background: var(--glass-2);
  box-shadow: var(--shadow-md);
}

.feature-card:hover::after { opacity: 1; }

.feature-card__icon {
  width: 50px;
  height: 50px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: var(--accent-grad-soft);
  border: 1px solid var(--glass-border);
  color: var(--violet);
  margin-bottom: 18px;
}

.feature-card__icon svg { width: 24px; height: 24px; }

.feature-card__title { font-size: 18px; font-weight: 680; margin-bottom: 9px; letter-spacing: -.01em; }
.feature-card__desc { font-size: 14.5px; color: var(--text-2); line-height: 1.68; }

.feature-card--wide { grid-column: span 2; }

/* ---------- Pipeline ---------- */
.pipeline {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
  align-items: stretch;
}

.node {
  position: relative;
  padding: 22px 16px;
  border-radius: var(--radius);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 11px;
}

.node__icon {
  width: 46px; height: 46px;
  border-radius: 13px;
  display: grid; place-items: center;
  background: var(--accent-grad-soft);
  border: 1px solid var(--glass-border);
  color: var(--cyan);
}

.node__icon svg { width: 23px; height: 23px; }

.node__step {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--text-3);
}

.node__title { font-size: 15px; font-weight: 650; }
.node__desc { font-size: 12.5px; color: var(--text-2); line-height: 1.5; }

.flow-arrow {
  display: grid;
  place-items: center;
  color: var(--text-3);
}

.flow-arrow svg { width: 22px; height: 22px; }

/* ---------- Platforms ---------- */
.platforms { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }

.platform-card {
  padding: 30px 26px;
  border-radius: var(--radius);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  transition: transform .35s var(--ease), border-color .35s ease, background .35s ease;
}

.platform-card:hover {
  transform: translateY(-5px);
  border-color: var(--hair-strong);
  background: var(--glass-2);
}

.platform-card__logo {
  width: 54px; height: 54px;
  border-radius: 15px;
  display: grid; place-items: center;
  font-size: 22px; font-weight: 800;
  color: #fff;
  margin-bottom: 18px;
}

.platform-card--dingtalk .platform-card__logo { background: linear-gradient(135deg, #1890ff, #0a6cff); }
.platform-card--feishu .platform-card__logo { background: linear-gradient(135deg, #3370ff, #00d6b9); }
.platform-card--wecom .platform-card__logo { background: linear-gradient(135deg, #07c160, #2ba471); }

.platform-card__name { font-size: 19px; font-weight: 700; margin-bottom: 8px; }
.platform-card__desc { font-size: 14px; color: var(--text-2); line-height: 1.65; margin-bottom: 16px; }

.platform-card__tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  color: var(--ok);
  background: rgba(52, 211, 153, .1);
  border: 1px solid rgba(52, 211, 153, .26);
  padding: 5px 11px;
  border-radius: 999px;
}

/* ---------- Gate demo section ---------- */
.gate {
  border-radius: var(--radius-lg);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  padding: clamp(32px, 4.4vw, 56px);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(28px, 4vw, 52px);
  align-items: center;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.gate::before {
  content: "";
  position: absolute;
  width: 420px; height: 420px;
  right: -120px; top: -160px;
  background: radial-gradient(circle, rgba(34, 211, 238, .2), transparent 60%);
  filter: blur(40px);
  pointer-events: none;
}

.gate__list { display: flex; flex-direction: column; gap: 16px; margin-top: 22px; }

.gate__item {
  display: flex;
  gap: 13px;
  align-items: flex-start;
  font-size: 14.5px;
  color: var(--text-2);
  line-height: 1.6;
}

.gate__check {
  flex: none;
  width: 26px; height: 26px;
  border-radius: 8px;
  display: grid; place-items: center;
  background: rgba(52, 211, 153, .14);
  color: var(--ok);
  margin-top: 1px;
}

.gate__check svg { width: 15px; height: 15px; }
.gate__item b { color: var(--text); font-weight: 650; }

/* ---------- Docs grid ---------- */
.docs-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }

.doc-card {
  display: flex;
  gap: 15px;
  padding: 24px;
  border-radius: var(--radius);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  transition: transform .3s var(--ease), border-color .3s ease, background .3s ease;
}

.doc-card:hover { transform: translateY(-4px); border-color: var(--hair-strong); background: var(--glass-2); }

.doc-card__icon {
  flex: none;
  width: 44px; height: 44px;
  border-radius: 12px;
  display: grid; place-items: center;
  background: var(--accent-grad-soft);
  border: 1px solid var(--glass-border);
  color: var(--violet);
}

.doc-card__icon svg { width: 22px; height: 22px; }
.doc-card__title { font-size: 16px; font-weight: 650; margin-bottom: 4px; }
.doc-card__desc { font-size: 13.5px; color: var(--text-2); line-height: 1.55; }

/* ---------- CTA band ---------- */
.cta {
  position: relative;
  text-align: center;
  padding: clamp(52px, 7vw, 88px) 32px;
  border-radius: var(--radius-lg);
  background: var(--accent-grad-soft);
  border: 1px solid var(--glass-border);
  overflow: hidden;
}

.cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--accent-grad);
  opacity: .08;
  pointer-events: none;
}

.cta__title { font-size: clamp(28px, 4vw, 42px); font-weight: 760; letter-spacing: -.02em; margin-bottom: 14px; position: relative; }
.cta__sub { font-size: 16px; color: var(--text-2); max-width: 560px; margin: 0 auto 28px; position: relative; }
.cta__actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; position: relative; }

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--hair);
  padding: clamp(48px, 7vw, 76px) 0 36px;
  margin-top: clamp(40px, 6vw, 80px);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 44px;
}

.footer__about { max-width: 320px; }
.footer__about p { font-size: 14px; color: var(--text-2); margin-top: 14px; line-height: 1.7; }

.footer__col h4 { font-size: 13px; font-weight: 650; letter-spacing: .04em; color: var(--text-3); text-transform: uppercase; margin-bottom: 16px; }
.footer__col a { display: block; font-size: 14px; color: var(--text-2); padding: 6px 0; transition: color .2s ease; }
.footer__col a:hover { color: var(--text); }

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  padding-top: 26px;
  border-top: 1px solid var(--hair);
  font-size: 13px;
  color: var(--text-3);
}

.footer__badges { display: flex; gap: 10px; flex-wrap: wrap; }
.footer__badge {
  font-size: 11.5px;
  font-weight: 600;
  color: var(--text-2);
  background: var(--glass);
  border: 1px solid var(--glass-border);
  padding: 5px 11px;
  border-radius: 8px;
}

/* ---------- Reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .7s var(--ease-out), transform .7s var(--ease-out);
  will-change: opacity, transform;
}

.reveal.in { opacity: 1; transform: none; }

.reveal[data-delay="1"] { transition-delay: .08s; }
.reveal[data-delay="2"] { transition-delay: .16s; }
.reveal[data-delay="3"] { transition-delay: .24s; }
.reveal[data-delay="4"] { transition-delay: .32s; }
.reveal[data-delay="5"] { transition-delay: .4s; }

/* ---------- Keyframes ---------- */
@keyframes aurora-a {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(120px, 80px) scale(1.15); }
}

@keyframes aurora-b {
  0% { transform: translate(0, 0) scale(1.05); }
  100% { transform: translate(-100px, 60px) scale(.9); }
}

@keyframes typing {
  0%, 60%, 100% { transform: translateY(0); opacity: .4; }
  30% { transform: translateY(-5px); opacity: 1; }
}

/* ---------- Focus / a11y ---------- */
:focus-visible {
  outline: 2px solid var(--violet);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .hero__inner { grid-template-columns: 1fr; }
  .hero__demo-wrap { order: -1; }
  .features { grid-template-columns: repeat(2, 1fr); }
  .feature-card--wide { grid-column: span 2; }
  .pipeline { grid-template-columns: repeat(2, 1fr); }
  .flow-arrow { display: none; }
  .gate { grid-template-columns: 1fr; }
  .docs-grid { grid-template-columns: repeat(2, 1fr); }
  .footer__grid { grid-template-columns: 1fr 1fr; gap: 30px; }
}

@media (max-width: 720px) {
  .nav__links { display: none; }
  .nav__actions .btn--ghost { display: none; }
  .burger { display: grid; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .features { grid-template-columns: 1fr; }
  .feature-card--wide { grid-column: span 1; }
  .pipeline { grid-template-columns: 1fr; }
  .platforms { grid-template-columns: 1fr; }
  .docs-grid { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr; }
  .footer__about { max-width: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
  .hero__bg::before, .hero__bg::after { animation: none; }
}

/* ---------- 品牌横幅（深浅主题自动切换） ---------- */
.brand-showcase { margin-top: 2.5rem; }
.brand-showcase--inner { margin-top: 2.5rem; }
.brand-showcase img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--hair);
  box-shadow: var(--shadow-md);
}
.brand-showcase__dark { display: none; }
[data-theme="dark"] .brand-showcase__light { display: none; }
[data-theme="dark"] .brand-showcase__dark { display: block; }