/* ==========================================================================
   智宇AI智能体 · 官方网站样式表
   纯静态 · 无第三方依赖 · 深色科技风
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root {
  --bg: #05070f;
  --bg-soft: #080b18;
  --bg-elev: #0c101f;
  --surface: rgba(255, 255, 255, 0.034);
  --surface-2: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.088);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text: #eef2ff;
  --text-2: #b9c2da;
  --muted: #8b96b4;
  --cyan: #22d3ee;
  --blue: #4f7cff;
  --violet: #8b5cf6;
  --pink: #f472b6;
  --green: #34d399;
  --grad: linear-gradient(118deg, #22d3ee 0%, #4f7cff 52%, #8b5cf6 100%);
  --grad-soft: linear-gradient(118deg, rgba(34, 211, 238, .16), rgba(139, 92, 246, .16));
  --shadow-sm: 0 2px 12px rgba(0, 0, 0, .3);
  --shadow: 0 18px 48px -18px rgba(0, 0, 0, .75);
  --shadow-glow: 0 20px 60px -24px rgba(79, 124, 255, .7);
  --r-xs: 8px;
  --r-sm: 12px;
  --r-md: 16px;
  --r-lg: 22px;
  --r-xl: 30px;
  --maxw: 1200px;
  --header-h: 68px;
  --ease: cubic-bezier(.22, .68, .34, 1);
}

/* ---------- 2. 基础重置 ---------- */
* { box-sizing: border-box; }
*::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 20px); }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* 全站背景光效 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(900px 520px at 12% -6%, rgba(79, 124, 255, .20), transparent 62%),
    radial-gradient(760px 460px at 92% 4%, rgba(139, 92, 246, .17), transparent 60%),
    radial-gradient(900px 600px at 50% 108%, rgba(34, 211, 238, .10), transparent 62%);
  pointer-events: none;
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(255, 255, 255, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .035) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 0%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 0%, transparent 78%);
  pointer-events: none;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
input, textarea, select { font: inherit; color: inherit; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, h5 { margin: 0; font-weight: 700; line-height: 1.22; letter-spacing: -.015em; }
p { margin: 0; }
::selection { background: rgba(79, 124, 255, .42); color: #fff; }

/* 滚动条 */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: #05070f; }
::-webkit-scrollbar-thumb { background: #1e2740; border-radius: 99px; border: 2px solid #05070f; }
::-webkit-scrollbar-thumb:hover { background: #2c3a5e; }

/* ---------- 3. 布局工具 ---------- */
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.section { padding: 104px 0; position: relative; }
.section--tight { padding: 72px 0; }
.section--soft { background: linear-gradient(180deg, transparent, rgba(255, 255, 255, .018) 18%, rgba(255, 255, 255, .018) 82%, transparent); }
.grid { display: grid; gap: 22px; }
.g2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.g3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.g4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.center { text-align: center; }
.mx-auto { margin-left: auto; margin-right: auto; }
.stack-sm > * + * { margin-top: 12px; }
.stack > * + * { margin-top: 20px; }

/* ---------- 4. 文字与标题 ---------- */
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12.5px; font-weight: 600; letter-spacing: .14em; text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow::before { content: ""; width: 22px; height: 1px; background: currentColor; opacity: .6; }

.section-head { max-width: 880px; margin-bottom: 52px; }
.section-head.center { margin-left: auto; margin-right: auto; }
.section-head h2 { font-size: clamp(28px, 3.6vw, 44px); margin-top: 16px; }
.section-head p { margin-top: 18px; color: var(--muted); font-size: 17px; }
.title-xl { font-size: clamp(36px, 5.4vw, 68px); line-height: 1.08; letter-spacing: -.028em; }
.lead { font-size: clamp(16px, 1.4vw, 18.5px); color: var(--text-2); }
.muted { color: var(--muted); }
.small { font-size: 14px; }

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

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  height: 46px; padding: 0 22px;
  border-radius: 999px;
  font-size: 15px; font-weight: 600; white-space: nowrap;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), background-color .25s, border-color .25s, color .25s;
}
.btn svg { width: 17px; height: 17px; flex: none; }
.btn-primary {
  background: var(--grad);
  color: #06101f;
  box-shadow: 0 14px 34px -14px rgba(79, 124, 255, .9);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 20px 44px -14px rgba(79, 124, 255, 1); }
.btn-ghost {
  border: 1px solid var(--border-strong);
  background: rgba(255, 255, 255, .03);
  color: var(--text);
  backdrop-filter: blur(8px);
}
.btn-ghost:hover { border-color: rgba(34, 211, 238, .55); background: rgba(34, 211, 238, .08); transform: translateY(-2px); }
.btn-lg { height: 54px; padding: 0 30px; font-size: 16.5px; }
.btn-sm { height: 38px; padding: 0 16px; font-size: 14px; }
.btn-block { width: 100%; }
.btn-link { display: inline-flex; align-items: center; gap: 7px; color: var(--cyan); font-weight: 600; font-size: 15px; transition: gap .2s var(--ease); }
.btn-link:hover { gap: 12px; }

/* ---------- 6. 顶部导航 ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--header-h);
  display: flex; align-items: center;
  transition: background-color .3s, border-color .3s, backdrop-filter .3s;
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  background: rgba(5, 7, 15, .82);
  backdrop-filter: blur(18px) saturate(150%);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
  border-bottom-color: var(--border);
}
.nav { display: flex; align-items: center; gap: 14px; width: 100%; }
.brand { display: flex; align-items: center; gap: 11px; flex: none; }
.brand-text { display: flex; flex-direction: column; gap: 1px; }
.brand img { width: 34px; height: 34px; border-radius: 10px; box-shadow: 0 6px 18px -6px rgba(79, 124, 255, .85); }
.brand-name { font-size: 17px; font-weight: 800; letter-spacing: -.02em; line-height: 1.1; }
.brand-sub { display: block; font-size: 10px; font-weight: 600; letter-spacing: .2em; color: var(--muted); text-transform: uppercase; }

.nav-links { display: flex; align-items: center; gap: 2px; margin-left: auto; }
.nav-links a {
  position: relative;
  display: block; padding: 9px 14px;
  font-size: 15px; font-weight: 500; color: var(--text-2);
  border-radius: 999px;
  transition: color .2s, background-color .2s;
}
.nav-links a:hover { color: #fff; background: rgba(255, 255, 255, .05); }
.nav-links a.is-active { color: #fff; }
.nav-links a.is-active::after {
  content: ""; position: absolute; left: 50%; bottom: 1px; transform: translateX(-50%);
  width: 16px; height: 2px; border-radius: 2px; background: var(--grad);
}
.nav-actions { display: flex; align-items: center; gap: 10px; margin-left: 18px; flex: none; }

.nav-toggle {
  display: none; margin-left: auto;
  width: 42px; height: 42px; border-radius: 12px;
  border: 1px solid var(--border); background: rgba(255, 255, 255, .04);
  align-items: center; justify-content: center;
}
.nav-toggle span { display: block; width: 18px; height: 1.6px; background: var(--text); border-radius: 2px; transition: transform .3s var(--ease), opacity .2s; }
.nav-toggle span + span { margin-top: 4.5px; }
.nav-toggle.is-open span:nth-child(1) { transform: translateY(6.1px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-6.1px) rotate(-45deg); }

.nav-drawer {
  position: fixed; top: var(--header-h); left: 0; right: 0; z-index: 99;
  background: rgba(6, 9, 20, .97);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 14px 24px 26px;
  display: none;
}
.nav-drawer.is-open { display: block; animation: drawerIn .28s var(--ease); }
.nav-drawer a { display: block; padding: 13px 4px; font-size: 16.5px; font-weight: 500; border-bottom: 1px solid var(--border); }
.nav-drawer .btn { margin-top: 18px; }
@keyframes drawerIn { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: none; } }

/* ---------- 7. 通用卡片 ---------- */
.card {
  position: relative;
  padding: 28px;
  border-radius: var(--r-lg);
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255, 255, 255, .055), rgba(255, 255, 255, .018));
  transition: transform .35s var(--ease), border-color .35s, box-shadow .35s;
  overflow: hidden;
}
.card::after {
  content: ""; position: absolute; inset: 0; border-radius: inherit;
  background: radial-gradient(420px 200px at var(--mx, 50%) var(--my, 0%), rgba(79, 124, 255, .16), transparent 70%);
  opacity: 0; transition: opacity .4s; pointer-events: none;
}
.card:hover { transform: translateY(-5px); border-color: var(--border-strong); box-shadow: var(--shadow); }
.card:hover::after { opacity: 1; }
.card h3 { font-size: 19px; }
.card p { color: var(--muted); font-size: 15px; margin-top: 10px; }
.card-flat { background: var(--surface); }
.card-flat:hover { transform: none; }

.card-icon {
  width: 48px; height: 48px; border-radius: 14px;
  display: grid; place-items: center;
  background: var(--grad-soft);
  border: 1px solid rgba(255, 255, 255, .12);
  color: #cfe4ff;
  margin-bottom: 20px;
}
.card-icon svg { width: 23px; height: 23px; }
.card-num {
  font-size: 12px; font-weight: 700; letter-spacing: .16em;
  color: var(--cyan); opacity: .85;
}
.tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 11px; border-radius: 999px;
  font-size: 12.5px; font-weight: 600;
  border: 1px solid var(--border-strong);
  background: rgba(255, 255, 255, .04);
  color: var(--text-2);
}
.tag-cyan { border-color: rgba(34, 211, 238, .38); background: rgba(34, 211, 238, .1); color: #a8eeff; }
.tag-violet { border-color: rgba(139, 92, 246, .4); background: rgba(139, 92, 246, .12); color: #d6c6ff; }
.tag-green { border-color: rgba(52, 211, 153, .38); background: rgba(52, 211, 153, .1); color: #a8f0d0; }
.tag-pink { border-color: rgba(244, 114, 182, .38); background: rgba(244, 114, 182, .1); color: #ffc9e6; }

.pill-badge {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 7px 15px 7px 9px; border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: rgba(255, 255, 255, .04);
  font-size: 13.5px; color: var(--text-2);
  backdrop-filter: blur(8px);
}
.pill-badge b { color: #fff; font-weight: 600; }
.dot-live { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 0 rgba(52, 211, 153, .7); animation: pulse 2.2s infinite; }
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(52, 211, 153, .65); }
  70% { box-shadow: 0 0 0 9px rgba(52, 211, 153, 0); }
  100% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0); }
}

/* ---------- 8. 首页 Hero ---------- */
.hero { position: relative; padding: calc(var(--header-h) + 84px) 0 92px; overflow: hidden; }
.hero-inner { display: grid; grid-template-columns: 1.06fr .94fr; gap: 60px; align-items: center; }
.hero h1 { margin-top: 22px; }
.hero-copy { margin-top: 24px; max-width: 560px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 22px; margin-top: 30px; font-size: 13.5px; color: var(--muted); }
.hero-meta span { display: inline-flex; align-items: center; gap: 7px; }
.hero-meta svg { width: 15px; height: 15px; color: var(--green); }

.hero-stats {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px; margin-top: 56px;
  border: 1px solid var(--border); border-radius: var(--r-lg);
  background: var(--border);
  overflow: hidden;
}
.hero-stats > div { background: #070a15; padding: 22px 20px; }
.stat-num { font-size: clamp(24px, 2.6vw, 32px); font-weight: 800; letter-spacing: -.03em; font-variant-numeric: tabular-nums; }
.stat-label { font-size: 13px; color: var(--muted); margin-top: 4px; }

/* 数字人主视觉 */
.orbs { position: absolute; border-radius: 50%; filter: blur(70px); pointer-events: none; z-index: -1; }
.orb-a { width: 420px; height: 420px; background: rgba(79, 124, 255, .3); top: -60px; left: -80px; animation: float 16s ease-in-out infinite; }
.orb-b { width: 360px; height: 360px; background: rgba(139, 92, 246, .26); top: 180px; right: -100px; animation: float 20s ease-in-out infinite reverse; }
@keyframes float { 0%, 100% { transform: translate(0, 0); } 50% { transform: translate(26px, -30px); } }

.dh-stage {
  position: relative;
  border-radius: var(--r-xl);
  border: 1px solid var(--border);
  background:
    radial-gradient(520px 320px at 50% 16%, rgba(79, 124, 255, .22), transparent 68%),
    linear-gradient(180deg, #0a0e1c, #06080f);
  box-shadow: var(--shadow), inset 0 1px 0 rgba(255, 255, 255, .07);
  padding: 26px;
  overflow: hidden;
}
.dh-stage::before {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 34px 34px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 45%, #000, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 45%, #000, transparent 75%);
  pointer-events: none;
}
.dh-canvas { position: absolute; inset: 0; width: 100%; height: 100%; opacity: .5; }
.dh-figure { position: relative; width: 100%; height: auto; aspect-ratio: 1 / 1; }
.dh-badge {
  position: absolute; z-index: 3;
  display: flex; align-items: center; gap: 8px;
  padding: 8px 13px; border-radius: 12px;
  background: rgba(8, 12, 24, .86);
  border: 1px solid var(--border-strong);
  font-size: 12.5px; color: var(--text-2);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
}
.dh-badge b { color: #fff; font-variant-numeric: tabular-nums; }
.dh-badge-1 { top: 16%; left: -6px; animation: floatY 7s ease-in-out infinite; }
.dh-badge-2 { top: 46%; right: -6px; animation: floatY 8.5s ease-in-out infinite .6s; }
.dh-badge-3 { bottom: 13%; left: 12%; animation: floatY 9.5s ease-in-out infinite 1.2s; }
@keyframes floatY { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-11px); } }

.dh-status {
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  margin-top: 18px; padding: 13px 16px;
  border-radius: var(--r-sm); border: 1px solid var(--border);
  background: rgba(255, 255, 255, .035);
  font-size: 13px; color: var(--muted);
}
.wave { display: flex; align-items: center; gap: 3px; height: 22px; }
.wave i { display: block; width: 3px; border-radius: 2px; background: linear-gradient(180deg, var(--cyan), var(--blue)); animation: wave 1.1s ease-in-out infinite; }
.wave i:nth-child(1) { height: 8px; animation-delay: 0s; }
.wave i:nth-child(2) { height: 16px; animation-delay: .1s; }
.wave i:nth-child(3) { height: 11px; animation-delay: .2s; }
.wave i:nth-child(4) { height: 20px; animation-delay: .3s; }
.wave i:nth-child(5) { height: 13px; animation-delay: .4s; }
.wave i:nth-child(6) { height: 18px; animation-delay: .5s; }
.wave i:nth-child(7) { height: 9px; animation-delay: .6s; }
@keyframes wave { 0%, 100% { transform: scaleY(.45); } 50% { transform: scaleY(1); } }

/* 打字机 */
.type-cursor { display: inline-block; width: 2px; height: 1em; background: var(--cyan); vertical-align: -.12em; margin-left: 3px; animation: blink 1s steps(1) infinite; }
@keyframes blink { 0%, 49% { opacity: 1; } 50%, 100% { opacity: 0; } }

/* ---------- 9. 客户 Logo 墙 ---------- */
.logos { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 14px; }
.logo-cell {
  display: grid; place-items: center;
  height: 74px; border-radius: var(--r-sm);
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, .022);
  color: #93a0bd; font-weight: 700; font-size: 15px; letter-spacing: .02em;
  transition: color .3s, border-color .3s, background-color .3s;
}
.logo-cell:hover { color: #fff; border-color: var(--border-strong); background: rgba(255, 255, 255, .05); }

/* ---------- 10. 流程 / 步骤 ---------- */
.steps { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; counter-reset: step; }
.step { position: relative; padding-top: 30px; }
.step::before {
  content: ""; position: absolute; top: 7px; left: 0; right: -20px; height: 1px;
  background: linear-gradient(90deg, rgba(79, 124, 255, .6), rgba(255, 255, 255, .08));
}
.step:last-child::before { right: 0; background: linear-gradient(90deg, rgba(79, 124, 255, .6), transparent); }
.step-dot {
  position: absolute; top: 0; left: 0;
  width: 15px; height: 15px; border-radius: 50%;
  background: #0a0e1c; border: 2px solid var(--blue);
  box-shadow: 0 0 0 5px rgba(79, 124, 255, .13);
}
.step h3 { font-size: 17.5px; margin-bottom: 8px; }
.step p { color: var(--muted); font-size: 14.5px; }
.step-num { font-size: 12px; font-weight: 700; letter-spacing: .14em; color: var(--cyan); display: block; margin-bottom: 8px; }

/* ---------- 11. 架构分层图 ---------- */
.arch { display: grid; gap: 10px; }
.arch-layer {
  display: grid; grid-template-columns: 168px 1fr; gap: 22px; align-items: center;
  padding: 20px 24px; border-radius: var(--r-md);
  border: 1px solid var(--border);
  background: linear-gradient(90deg, rgba(255, 255, 255, .05), rgba(255, 255, 255, .015));
  transition: border-color .3s, transform .3s var(--ease);
}
.arch-layer:hover { border-color: var(--border-strong); transform: translateX(4px); }
.arch-layer > strong { font-size: 15.5px; }
.arch-layer > strong span { display: block; font-size: 12px; font-weight: 600; letter-spacing: .12em; color: var(--muted); text-transform: uppercase; margin-top: 3px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  padding: 5px 12px; border-radius: 999px; font-size: 13px;
  border: 1px solid var(--border); background: rgba(255, 255, 255, .04); color: var(--text-2);
}

/* ---------- 12. 案例 / 数据 ---------- */
.case-card { display: flex; flex-direction: column; height: 100%; }
.case-card .case-logo {
  width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center;
  font-weight: 800; font-size: 17px; color: #04101f; background: var(--grad); margin-bottom: 18px;
}
.case-metrics { display: flex; flex-wrap: wrap; gap: 24px; margin-top: auto; padding-top: 22px; border-top: 1px solid var(--border); }
.case-metrics div b { display: block; font-size: 21px; font-weight: 800; letter-spacing: -.02em; }
.case-metrics div span { font-size: 12.5px; color: var(--muted); }

.metric-band {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 22px;
  padding: 40px; border-radius: var(--r-xl);
  border: 1px solid var(--border);
  background: linear-gradient(120deg, rgba(34, 211, 238, .1), rgba(79, 124, 255, .1) 45%, rgba(139, 92, 246, .1));
}
.metric-band .stat-num { font-size: clamp(28px, 3.4vw, 40px); }
.metric-band .stat-label { color: var(--text-2); }

/* ---------- 13. 特性对比列表 ---------- */
.check-list { display: grid; gap: 13px; }
.check-list li { display: flex; gap: 12px; align-items: flex-start; font-size: 15.5px; color: var(--text-2); }
.check-list svg { width: 19px; height: 19px; flex: none; margin-top: 4px; color: var(--green); }
.check-list.cross svg { color: #f87171; }

/* ---------- 14. FAQ ---------- */
.faq { border-top: 1px solid var(--border); }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-q {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 22px;
  padding: 22px 4px; text-align: left; font-size: 16.5px; font-weight: 600;
  transition: color .2s;
}
.faq-q:hover { color: var(--cyan); }
.faq-q i {
  flex: none; width: 22px; height: 22px; position: relative;
  border-radius: 50%; border: 1px solid var(--border-strong);
  transition: border-color .3s, background-color .3s, transform .35s var(--ease);
}
.faq-q i::before, .faq-q i::after {
  content: ""; position: absolute; top: 50%; left: 50%; background: var(--text);
  transform: translate(-50%, -50%); transition: opacity .3s, background-color .3s;
}
.faq-q i::before { width: 9px; height: 1.5px; }
.faq-q i::after { width: 1.5px; height: 9px; }
.faq-item.is-open .faq-q { color: #fff; }
.faq-item.is-open .faq-q i { background: var(--grad); border-color: transparent; transform: rotate(135deg); }
.faq-item.is-open .faq-q i::before, .faq-item.is-open .faq-q i::after { background: #06101f; }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .42s var(--ease); }
.faq-a > div { padding: 0 60px 24px 4px; color: var(--muted); font-size: 15.5px; }

/* ---------- 15. 代码块 ---------- */
.code-wrap {
  border-radius: var(--r-lg); border: 1px solid var(--border);
  background: #070a14; overflow: hidden;
}
.code-bar {
  display: flex; align-items: center; gap: 8px;
  padding: 12px 16px; border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, .028);
  font-size: 12.5px; color: var(--muted);
}
.code-bar i { width: 10px; height: 10px; border-radius: 50%; display: block; }
.code-bar .d1 { background: #ff5f57; } .code-bar .d2 { background: #febc2e; } .code-bar .d3 { background: #28c840; }
.code-bar span { margin-left: auto; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
pre { margin: 0; padding: 22px; overflow-x: auto; font-size: 13.5px; line-height: 1.75; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace; }
pre code { color: #c7d3f0; }
.tk-k { color: #c792ea; } .tk-s { color: #a5e8b5; } .tk-c { color: #5a6784; font-style: italic; }
.tk-f { color: #82aaff; } .tk-n { color: #f78c6c; } .tk-t { color: #7fdbca; }
:not(pre) > code {
  padding: 2px 7px; border-radius: 6px; font-size: .9em;
  background: rgba(255, 255, 255, .07); border: 1px solid var(--border); color: #b8c8ff;
}

/* ---------- 16. Tabs ---------- */
.tabs { display: flex; flex-wrap: wrap; gap: 8px; padding: 6px; border-radius: 999px; border: 1px solid var(--border); background: rgba(255,255,255,.03); width: fit-content; }
.tab {
  padding: 9px 20px; border-radius: 999px; font-size: 14.5px; font-weight: 600; color: var(--muted);
  transition: color .25s, background-color .25s;
}
.tab:hover { color: var(--text); }
.tab.is-active { color: #06101f; background: var(--grad); }
.tab-panel { display: none; }
.tab-panel.is-active { display: block; animation: fadeUp .45s var(--ease); }

/* ---------- 17. 表格 ---------- */
.table-wrap { border: 1px solid var(--border); border-radius: var(--r-lg); overflow: hidden; overflow-x: auto; }
table { width: 100%; border-collapse: collapse; min-width: 620px; }
th, td { padding: 15px 20px; text-align: left; font-size: 14.5px; border-bottom: 1px solid var(--border); }
th { background: rgba(255, 255, 255, .04); font-size: 13px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); font-weight: 700; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover td { background: rgba(255, 255, 255, .022); }
td b { color: #fff; }

/* ---------- 18. CTA 区块 ---------- */
.cta-band {
  position: relative; overflow: hidden;
  padding: 66px 48px; border-radius: var(--r-xl);
  border: 1px solid var(--border-strong);
  background:
    radial-gradient(620px 320px at 12% 0%, rgba(34, 211, 238, .2), transparent 62%),
    radial-gradient(620px 340px at 88% 100%, rgba(139, 92, 246, .22), transparent 62%),
    linear-gradient(180deg, #0a0f1f, #070a14);
  box-shadow: var(--shadow);
}
.cta-band h2 { font-size: clamp(26px, 3.4vw, 40px); }
.cta-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 30px; }

/* 表单 */
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.field { display: flex; flex-direction: column; gap: 8px; }
.field.full { grid-column: 1 / -1; }
.field label { font-size: 13.5px; color: var(--text-2); font-weight: 500; }
.field input, .field textarea, .field select {
  width: 100%; padding: 12px 14px;
  border-radius: var(--r-sm); border: 1px solid var(--border);
  background: rgba(255, 255, 255, .04);
  font-size: 15px; outline: none;
  transition: border-color .2s, box-shadow .2s, background-color .2s;
}
.field textarea { resize: vertical; min-height: 110px; }
.field input:focus, .field textarea:focus, .field select:focus {
  border-color: rgba(79, 124, 255, .7);
  background: rgba(79, 124, 255, .06);
  box-shadow: 0 0 0 3px rgba(79, 124, 255, .16);
}
.field input::placeholder, .field textarea::placeholder { color: #5b6785; }
.form-note { font-size: 13px; color: var(--muted); }
.toast {
  position: fixed; left: 50%; bottom: 34px; transform: translate(-50%, 20px);
  z-index: 200; display: flex; align-items: center; gap: 10px;
  padding: 13px 20px; border-radius: 999px;
  background: rgba(9, 14, 28, .96); border: 1px solid rgba(52, 211, 153, .45);
  color: #dff7ec; font-size: 14.5px; box-shadow: var(--shadow);
  opacity: 0; pointer-events: none; transition: opacity .3s, transform .3s var(--ease);
}
.toast.is-show { opacity: 1; transform: translate(-50%, 0); }

/* ---------- 19. 页脚 ---------- */
.site-footer { margin-top: 40px; border-top: 1px solid var(--border); background: rgba(4, 6, 13, .7); padding: 66px 0 30px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 44px; }
.footer-brand p { color: var(--muted); font-size: 14.5px; margin-top: 16px; max-width: 320px; }
.footer-social { display: flex; gap: 10px; margin-top: 22px; }
.footer-social a {
  width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center;
  border: 1px solid var(--border); background: rgba(255, 255, 255, .03); color: var(--muted);
  transition: color .25s, border-color .25s, transform .25s var(--ease);
}
.footer-social a:hover { color: #fff; border-color: var(--border-strong); transform: translateY(-2px); }
.footer-social svg { width: 17px; height: 17px; }
.footer-col h4 { font-size: 14px; letter-spacing: .04em; margin-bottom: 16px; }
.footer-col a { display: block; font-size: 14.5px; color: var(--muted); padding: 6px 0; transition: color .2s, transform .2s; }
.footer-col a:hover { color: var(--cyan); transform: translateX(3px); }
.footer-bottom {
  display: flex; flex-wrap: wrap; gap: 14px; justify-content: space-between; align-items: center;
  margin-top: 52px; padding-top: 24px; border-top: 1px solid var(--border);
  font-size: 13.5px; color: var(--muted);
}
.footer-bottom a:hover { color: var(--text); }

/* ---------- 20. 页面头（内页） ---------- */
.page-hero { padding: calc(var(--header-h) + 78px) 0 62px; text-align: center; }
.page-hero h1 { font-size: clamp(30px, 4.4vw, 52px); margin-top: 18px; }
.page-hero p { margin: 20px auto 0; max-width: 680px; color: var(--muted); font-size: 17px; }
.crumbs { display: inline-flex; align-items: center; gap: 9px; font-size: 13.5px; color: var(--muted); }
.crumbs a:hover { color: var(--cyan); }

/* ---------- 21. 滚动动画 ---------- */
[data-reveal] { opacity: 0; transform: translateY(26px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
[data-reveal].is-in { opacity: 1; transform: none; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }

/* 回到顶部 */
.to-top {
  position: fixed; right: 26px; bottom: 26px; z-index: 90;
  width: 44px; height: 44px; border-radius: 14px;
  display: grid; place-items: center;
  background: rgba(10, 14, 28, .9); border: 1px solid var(--border-strong); color: var(--text-2);
  backdrop-filter: blur(10px);
  opacity: 0; pointer-events: none; transform: translateY(12px);
  transition: opacity .3s, transform .3s var(--ease), color .25s, border-color .25s;
  box-shadow: var(--shadow-sm);
}
.to-top.is-show { opacity: 1; pointer-events: auto; transform: none; }
.to-top:hover { color: #fff; border-color: rgba(34, 211, 238, .6); }
.to-top svg { width: 19px; height: 19px; }

/* ---------- 23. 数字人 SVG 动效（首页主视觉） ---------- */
.dh-rotate { animation: dhSpin 34s linear infinite; }
.dh-rotate-rev { animation: dhSpin 52s linear infinite reverse; }
@keyframes dhSpin { to { transform: rotate(360deg); } }
.dh-scan { animation: dhScan 5.2s cubic-bezier(.45, 0, .55, 1) infinite alternate; }
@keyframes dhScan { from { transform: translateY(58px); } to { transform: translateY(360px); } }
.dh-node { animation: dhNode 3.4s ease-in-out infinite; transform-box: fill-box; transform-origin: center; }
.dh-node:nth-child(2n) { animation-delay: .5s; }
.dh-node:nth-child(3n) { animation-delay: 1s; }
.dh-node:nth-child(4n) { animation-delay: 1.6s; }
@keyframes dhNode { 0%, 100% { opacity: .45; } 50% { opacity: 1; } }
.dh-bars path { transform-box: fill-box; transform-origin: bottom; animation: dhBar 1.25s ease-in-out infinite; }
.dh-bars path:nth-child(2n) { animation-duration: 1.6s; }
.dh-bars path:nth-child(3n) { animation-duration: 1.05s; }
.dh-bars path:nth-child(5n) { animation-duration: 1.85s; }
@keyframes dhBar { 0%, 100% { transform: scaleY(.5); } 50% { transform: scaleY(1.25); } }

/* ---------- 22. 响应式 ---------- */
@media (max-width: 1080px) {
  .hero-inner { grid-template-columns: 1fr; gap: 52px; }
  .hero-copy { max-width: 680px; }
  .dh-stage { max-width: 560px; margin: 0 auto; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 34px; }
  .logos { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .g4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 900px) {
  .nav-links, .nav-actions { display: none; }
  .nav-toggle { display: flex; }
  .section { padding: 76px 0; }
  .g3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 30px 20px; }
  .step::before { right: -20px; }
  .step:nth-child(2n)::before { background: linear-gradient(90deg, rgba(79,124,255,.6), transparent); }
  .metric-band { grid-template-columns: repeat(2, minmax(0, 1fr)); padding: 30px 26px; }
  .hero-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .arch-layer { grid-template-columns: 1fr; gap: 12px; }
}
@media (max-width: 640px) {
  .container { padding: 0 18px; }
  .section { padding: 62px 0; }
  .g2, .g3, .g4 { grid-template-columns: 1fr; }
  .hero { padding-top: calc(var(--header-h) + 52px); padding-bottom: 66px; }
  .card { padding: 22px; }
  .cta-band { padding: 42px 24px; }
  .form-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .logos { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .faq-a > div { padding-right: 20px; }
  .dh-badge-1, .dh-badge-2 { display: none; }
  .brand-sub { display: none; }
  .steps { grid-template-columns: 1fr; }
  .step::before { display: none; }
  .case-metrics { gap: 18px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  html { scroll-behavior: auto; }
  [data-reveal] { opacity: 1; transform: none; }
}

/* 打印 */
@media print {
  body::before, body::after, .site-header, .to-top, .nav-drawer { display: none !important; }
  body { background: #fff; color: #111; }
}