/* ==========================================================================
   英磊AI 独立站 · 样式（深空藏青 + 流金）
   ========================================================================== */

:root {
  --ai-bg: #050b14;
  --ai-bg-2: #081524;
  --ai-line: rgba(214, 183, 122, .16);
  --ai-gold: #d6b77a;
  --ai-gold-2: #b98f45;
  --ai-text: #e9eef5;
  --ai-mut: rgba(233, 238, 245, .58);
  --ai-radius: 10px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--ai-bg);
  color: var(--ai-text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans SC",
    "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body.no-scroll { overflow: hidden; }

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
h1, h2, h3, p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }

::selection { background: rgba(214, 183, 122, .3); }

.ai-container { width: 100%; max-width: 1180px; margin: 0 auto; padding: 0 24px; }

/* ---------- 顶栏 ---------- */

.ai-header {
  position: fixed;
  inset: 0 0 auto 0;
  height: 72px;
  z-index: 100;
  display: flex;
  align-items: center;
  background: rgba(5, 11, 20, .55);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border-bottom: 1px solid rgba(214, 183, 122, .14);
}
.ai-header .ai-container { display: flex; align-items: center; justify-content: space-between; gap: 20px; }

.ai-logo { display: inline-flex; align-items: center; gap: 12px; }
.ai-logo-mark {
  width: 42px; height: 42px; border-radius: 9px;
  background: #fff;
  display: grid; place-items: center;
  padding: 5px;
  box-shadow: 0 5px 16px -8px rgba(0, 0, 0, .6);
}
.ai-logo-mark img { width: 100%; height: 100%; object-fit: contain; display: block; }
.ai-logo-text { line-height: 1.1; }
.ai-logo-cn { font-size: 18px; font-weight: 700; letter-spacing: .14em; color: #fff; }
.ai-logo-en { font-size: 8.5px; letter-spacing: .32em; color: var(--ai-gold); font-weight: 600; margin-top: 3px; }

.ai-nav { display: flex; align-items: center; gap: 6px; }
.ai-nav a {
  padding: 9px 15px;
  font-size: 14.5px;
  color: var(--ai-mut);
  border-radius: 999px;
  transition: color .2s, background .2s;
}
.ai-nav a:hover { color: #fff; background: rgba(255, 255, 255, .06); }

.ai-header-cta {
  display: inline-flex; align-items: center; gap: 8px;
  min-height: 40px; padding: 0 18px;
  border: 1px solid rgba(214, 183, 122, .5);
  border-radius: 999px;
  font-size: 14px; color: var(--ai-gold);
  transition: all .25s var(--ease);
}
.ai-header-cta:hover { background: var(--ai-gold); color: #171004; }
.ai-header-tel {
  display: inline-flex; align-items: center; gap: 7px;
  min-height: 40px; padding: 0 16px;
  border: 1px solid rgba(255, 255, 255, .16);
  border-radius: 999px;
  font-size: 13.5px; color: var(--ai-text);
  font-variant-numeric: tabular-nums;
  transition: all .25s var(--ease);
}
.ai-header-tel:hover { border-color: rgba(214, 183, 122, .6); color: var(--ai-gold); }
@media (max-width: 720px) {
  .ai-header-tel { display: none; }
}

/* ---------- 主视觉 ---------- */

.ai-hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
#contourCanvas {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  display: block;
}
.ai-hero-glow {
  position: absolute; inset: 0;
  background:
    radial-gradient(900px 460px at 78% 26%, rgba(214, 183, 122, .12), transparent 62%),
    radial-gradient(700px 420px at 12% 82%, rgba(43, 92, 148, .16), transparent 65%),
    linear-gradient(180deg, transparent calc(36% - 70px), rgba(214, 183, 122, .07) 36%, transparent calc(36% + 80px));
  pointer-events: none;
}
.ai-hero-vignette {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(5, 11, 20, .5), transparent 30%, transparent 62%, var(--ai-bg) 96%);
  pointer-events: none;
}
.ai-hero .ai-container { position: relative; z-index: 2; }
.ai-hero-inner { max-width: 760px; padding: 130px 0 90px; }

.ai-eyebrow {
  display: inline-flex; align-items: center; gap: 12px;
  font-size: 12px; letter-spacing: .26em;
  color: var(--ai-gold); font-weight: 600;
  text-transform: uppercase;
}
.ai-eyebrow::before {
  content: "";
  width: 34px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--ai-gold));
}

.ai-hero h1 {
  margin-top: 26px;
  font-size: clamp(38px, 6.2vw, 78px);
  line-height: 1.14;
  letter-spacing: .02em;
  font-weight: 700;
  color: #fff;
}
.ai-hero h1 em {
  font-style: normal;
  background: linear-gradient(100deg, #f3e3bd, var(--ai-gold) 55%, var(--ai-gold-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.ai-hero-lead {
  margin-top: 26px;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.95;
  color: var(--ai-mut);
  max-width: 600px;
}
.ai-hero-actions { margin-top: 42px; display: flex; gap: 14px; flex-wrap: wrap; }

.ai-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 50px; padding: 0 30px;
  border-radius: 6px;
  font-size: 15px; font-weight: 500; letter-spacing: .02em;
  border: 1px solid transparent;
  transition: all .28s var(--ease);
}
.ai-btn-gold { background: linear-gradient(120deg, #e8cf9a, var(--ai-gold-2)); color: #171004; font-weight: 600; }
.ai-btn-gold:hover { transform: translateY(-2px); box-shadow: 0 18px 44px -18px rgba(214, 183, 122, .55); }
.ai-btn-ghost { border-color: rgba(255, 255, 255, .28); color: #fff; }
.ai-btn-ghost:hover { border-color: #fff; background: rgba(255, 255, 255, .07); }

.ai-hero-tip {
  position: absolute;
  left: 50%; bottom: 26px;
  transform: translateX(-50%);
  z-index: 2;
  font-size: 12px; letter-spacing: .3em;
  color: rgba(233, 238, 245, .34);
  animation: tipFloat 2.6s var(--ease) infinite;
}
@keyframes tipFloat { 50% { transform: translate(-50%, 6px); opacity: .5; } }

/* ---------- 分区通用 ---------- */

.ai-section { padding: 110px 0; position: relative; }
.ai-section-head { max-width: 660px; }
.ai-section-head h2 {
  margin-top: 20px;
  font-size: clamp(26px, 3.2vw, 40px);
  line-height: 1.3;
  font-weight: 700;
  color: #fff;
}
.ai-section-head p { margin-top: 16px; color: var(--ai-mut); }
.ai-section-head.is-center { margin: 0 auto; text-align: center; }
.ai-section-head.is-center .ai-eyebrow { justify-content: center; }
.ai-section-head.is-center .ai-eyebrow::after {
  content: "";
  width: 34px; height: 1px;
  background: linear-gradient(90deg, var(--ai-gold), transparent);
}

/* ---------- 能力矩阵 ---------- */

.ai-cap-grid {
  margin-top: 64px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.ai-cap {
  position: relative;
  padding: 34px 30px 30px;
  border: 1px solid rgba(255, 255, 255, .08);
  border-radius: var(--ai-radius);
  background: linear-gradient(170deg, rgba(255, 255, 255, .045), rgba(255, 255, 255, .012));
  overflow: hidden;
  transition: transform .4s var(--ease), border-color .3s, background .3s;
}
.ai-cap::before {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(420px 200px at 80% -10%, rgba(214, 183, 122, .14), transparent 70%);
  opacity: 0;
  transition: opacity .4s var(--ease);
}
.ai-cap:hover { transform: translateY(-6px); border-color: rgba(214, 183, 122, .4); }
.ai-cap:hover::before { opacity: 1; }
.ai-cap-no {
  font-family: Georgia, serif;
  font-size: 13px; letter-spacing: .18em;
  color: var(--ai-gold);
}
.ai-cap h3 { margin-top: 18px; font-size: 19px; font-weight: 600; color: #fff; }
.ai-cap p { margin-top: 12px; font-size: 14px; color: var(--ai-mut); min-height: 76px; }
.ai-cap-link {
  margin-top: 22px;
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13.5px; color: var(--ai-gold); font-weight: 500;
}
.ai-cap-link::after { content: "→"; transition: transform .25s var(--ease); }
.ai-cap:hover .ai-cap-link::after { transform: translateX(4px); }

/* ---------- 落地方式 ---------- */

.ai-flow {
  margin-top: 64px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  counter-reset: step;
}
.ai-step {
  position: relative;
  padding: 30px 26px;
  border: 1px solid rgba(255, 255, 255, .08);
  border-radius: var(--ai-radius);
  background: rgba(255, 255, 255, .025);
}
.ai-step::after {
  content: "→";
  position: absolute; right: -16px; top: 50%;
  transform: translateY(-50%);
  color: rgba(214, 183, 122, .5);
  font-size: 16px;
}
.ai-step:last-child::after { display: none; }
.ai-step-no { font-family: Georgia, serif; font-size: 28px; color: rgba(214, 183, 122, .55); line-height: 1; }
.ai-step h3 { margin: 16px 0 10px; font-size: 16.5px; font-weight: 600; color: #fff; }
.ai-step p { font-size: 13.5px; color: var(--ai-mut); }

/* ---------- 数据 ---------- */

.ai-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: rgba(255, 255, 255, .08);
  border: 1px solid rgba(255, 255, 255, .08);
  border-radius: var(--ai-radius);
  overflow: hidden;
}
.ai-stat { background: var(--ai-bg-2); padding: 36px 30px; }
.ai-stat-num {
  font-size: 36px; font-weight: 700; color: #fff;
  font-variant-numeric: tabular-nums;
}
.ai-stat-num small { font-size: .48em; color: var(--ai-gold); font-weight: 600; margin-left: 3px; }
.ai-stat-label { font-size: 13.5px; color: var(--ai-mut); margin-top: 6px; }

/* ---------- AI 部门实景横幅 ---------- */

.ai-office {
  position: relative;
  overflow: hidden;
  min-height: 380px;
  display: flex;
  align-items: flex-end;
}
.ai-office img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover; object-position: center 40%;
  filter: saturate(.92) brightness(.82);
  transform: scale(1.02);
}
.ai-office::before {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, var(--ai-bg) 0%, rgba(5,11,20,.25) 35%, rgba(5,11,20,.72) 100%);
  z-index: 1;
}
.ai-office-cap {
  position: relative; z-index: 2;
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 70px 28px 54px;
}
.ai-office-cap p {
  max-width: 560px;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--ai-text);
  text-shadow: 0 2px 14px rgba(0,0,0,.45);
}
@media (max-width: 760px) {
  .ai-office { min-height: 300px; }
  .ai-office-cap { padding: 54px 22px 40px; }
  .ai-office-cap p { font-size: 14.5px; }
}

/* ---------- CTA ---------- */

.ai-cta {
  position: relative;
  padding: 110px 0;
  text-align: center;
  overflow: hidden;
}
.ai-cta::before {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(700px 320px at 50% 40%, rgba(214, 183, 122, .14), transparent 62%);
}
.ai-cta .ai-container { position: relative; z-index: 2; }
.ai-cta h2 { font-size: clamp(28px, 4vw, 46px); font-weight: 700; color: #fff; line-height: 1.3; }
.ai-cta p { margin: 18px auto 0; max-width: 560px; color: var(--ai-mut); }
.ai-cta-actions { margin-top: 38px; display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; }

/* ---------- 页脚 ---------- */

.ai-footer {
  border-top: 1px solid rgba(255, 255, 255, .08);
  padding: 40px 0;
}
.ai-footer .ai-container { display: block; }
.ai-footer p { font-size: 13px; color: rgba(233, 238, 245, .4); }
.ai-footer a { font-size: 13.5px; color: var(--ai-mut); transition: color .2s; }
.ai-footer a:hover { color: var(--ai-gold); }
.ai-footer-top {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px;
  padding-bottom: 26px; margin-bottom: 22px;
  border-bottom: 1px solid rgba(255, 255, 255, .08);
}
.ai-footer-block { display: grid; gap: 9px; align-content: start; }
.ai-footer-block .ai-footer-cat {
  font-size: 12.5px; color: var(--ai-gold); letter-spacing: .1em;
  margin-bottom: 3px; opacity: .9;
}
.ai-footer-block p { line-height: 1.7; }
.ai-footer-copy { font-size: 12.5px; }
@media (max-width: 980px) {
  .ai-footer-top { grid-template-columns: repeat(2, 1fr); gap: 22px; }
}
@media (max-width: 560px) {
  .ai-footer-top { grid-template-columns: 1fr; }
}

/* ---------- 滚动显现 ---------- */

.ai-reveal { opacity: 0; transform: translateY(24px); transition: opacity .8s var(--ease), transform .8s var(--ease); }
.ai-reveal.is-in { opacity: 1; transform: none; }
.ai-reveal.d1 { transition-delay: .08s; }
.ai-reveal.d2 { transition-delay: .16s; }
.ai-reveal.d3 { transition-delay: .24s; }

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  .ai-reveal { opacity: 1; transform: none; }
}

/* ---------- 响应式 ---------- */

@media (max-width: 1080px) {
  .ai-cap-grid { grid-template-columns: repeat(2, 1fr); }
  .ai-flow { grid-template-columns: repeat(2, 1fr); }
  .ai-step::after { display: none; }
}

@media (max-width: 760px) {
  .ai-nav { display: none; }
  .ai-section { padding: 78px 0; }
  .ai-cap-grid, .ai-flow { grid-template-columns: 1fr; }
  .ai-cap p { min-height: 0; }
  .ai-stats { grid-template-columns: repeat(2, 1fr); }
  .ai-hero-inner { padding: 110px 0 70px; }
  .ai-hero-actions .ai-btn { width: 100%; }
  .ai-footer .ai-container { flex-direction: column; text-align: center; }
}

/* ==========================================================================
   AI 智能体服务 · 三类交付方案
   ========================================================================== */
.ai-agent-list { display: grid; gap: 26px; margin-top: 46px; }
.ai-agent {
  display: grid; grid-template-columns: 380px 1fr; gap: 32px; align-items: stretch;
  background: var(--ai-bg); border: 1px solid rgba(255, 255, 255, .1);
  border-radius: 14px; overflow: hidden;
  transition: border-color .3s var(--ease), transform .3s var(--ease), box-shadow .3s var(--ease);
}
.ai-agent:hover {
  border-color: rgba(214, 183, 122, .45);
  transform: translateY(-3px);
  box-shadow: 0 24px 50px -28px rgba(0, 0, 0, .8);
}
.ai-agent .aa-media { position: relative; overflow: hidden; }
.ai-agent .aa-media img {
  display: block; width: 100%; height: 100%;
  min-height: 260px; object-fit: cover;
  transition: transform .6s var(--ease);
}
.ai-agent:hover .aa-media img { transform: scale(1.04); }
.ai-agent .aa-tag {
  position: absolute; top: 16px; left: 16px;
  padding: 5px 12px; border-radius: 999px;
  background: rgba(5, 11, 20, .78); border: 1px solid rgba(214, 183, 122, .5);
  font-size: 12px; letter-spacing: .1em; color: var(--ai-gold);
}
.ai-agent .aa-body { padding: 30px 34px 32px; min-width: 0; }
.ai-agent h3 { font-size: 21px; font-weight: 500; color: var(--ai-text); margin-bottom: 12px; }
.ai-agent .aa-lead { font-size: 14px; line-height: 1.8; color: var(--ai-mut); margin-bottom: 20px; }
.ai-agent .aa-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px; margin-bottom: 18px;
}
.ai-agent .aa-group {
  display: flex; flex-direction: column; gap: 5px;
  padding: 12px 14px; border-radius: var(--ai-radius);
  background: rgba(255, 255, 255, .04); border: 1px solid rgba(255, 255, 255, .07);
}
.ai-agent .aa-group .aa-cat {
  font-size: 11.5px; letter-spacing: .12em; color: var(--ai-gold);
}
.ai-agent .aa-group span:not(.aa-cat) { font-size: 13px; color: rgba(233, 238, 245, .82); line-height: 1.6; }
.ai-agent .aa-flow {
  display: flex; align-items: center; flex-wrap: wrap; gap: 8px;
  margin-bottom: 18px; font-size: 13px; color: rgba(233, 238, 245, .72);
}
.ai-agent .aa-flow i { width: 14px; height: 1px; background: rgba(214, 183, 122, .6); display: block; }
.ai-agent .aa-meta { display: grid; gap: 8px; }
.ai-agent .aa-meta span { font-size: 13px; color: var(--ai-mut); line-height: 1.7; }
.ai-agent .aa-meta b {
  display: inline-block; margin-right: 8px; font-weight: 500;
  color: var(--ai-gold); letter-spacing: .04em;
}
@media (max-width: 980px) {
  .ai-agent { grid-template-columns: 1fr; }
  .ai-agent .aa-media img { min-height: 200px; }
  .ai-agent .aa-body { padding: 26px 22px 28px; }
}