/* ZXH 智能体 · 营销官网样式
 * 调性：深色主体(#0f1115) + 浅色营销区块(#f5f7fb)，复用产品令牌 #5b8cff
 * 规范来源：docs1021/docs/design/UI设计全局规范.md
 */
:root {
  --bg:#0f1115; --panel:#171a21; --line:#262b36; --fg:#e6e8ee; --mut:#8b93a7;
  --accent:#5b8cff; --tool:#f5a623; --ok:#3ecf8e; --err:#ff6b6b;
  --light:#f5f7fb; --light-fg:#10131a; --light-mut:#5b6472; --light-line:#e2e7f0;
  --radius:12px; --radius-sm:8px;
  --shadow:0 8px 24px rgba(0,0,0,.35);
  --maxw:1140px;
  --font:-apple-system,"Segoe UI","Microsoft YaHei",sans-serif;
}
* { box-sizing:border-box; }
html { scroll-behavior:smooth; }
body {
  margin:0; background:var(--bg); color:var(--fg);
  font-family:var(--font); font-size:14px; line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
a { color:var(--accent); text-decoration:none; }
a:hover { text-decoration:underline; }
:focus-visible { outline:2px solid var(--accent); outline-offset:2px; border-radius:4px; }
img { max-width:100%; display:block; }
h1,h2,h3 { line-height:1.25; font-weight:600; margin:0 0 12px; }
h1 { font-size:34px; } h2 { font-size:26px; } h3 { font-size:17px; }
p { margin:0 0 12px; }
.wrap { max-width:var(--maxw); margin:0 auto; padding:0 20px; }
.mut { color:var(--mut); }
.center { text-align:center; }
.eyebrow { color:var(--accent); font-size:13px; font-weight:600; letter-spacing:.5px; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position:sticky; top:0; z-index:50; backdrop-filter:blur(10px);
  background:rgba(15,17,21,.82); border-bottom:1px solid var(--line);
}
.nav { display:flex; align-items:center; height:60px; gap:18px; }
.logo { display:flex; align-items:center; gap:10px; font-weight:700; font-size:16px; color:var(--fg); }
.logo .mark {
  width:30px; height:30px; border-radius:8px; background:var(--accent);
  color:#fff; display:grid; place-items:center; font-weight:700; font-size:15px;
}
.nav-links { display:flex; gap:22px; margin-left:14px; }
.nav-links a { color:var(--mut); font-size:14px; }
.nav-links a:hover { color:var(--fg); text-decoration:none; }
.nav-cta { margin-left:auto; display:flex; gap:10px; align-items:center; }
.nav-toggle { display:none; margin-left:auto; background:none; border:1px solid var(--line);
  color:var(--fg); border-radius:8px; width:40px; height:36px; cursor:pointer; font-size:18px; }

/* ---------- 按钮 ---------- */
.btn {
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding:11px 20px; border-radius:10px; font-size:14px; font-weight:600;
  cursor:pointer; border:1px solid transparent; transition:all .15s ease; min-height:40px;
}
.btn-primary { background:var(--accent); color:#fff; }
.btn-primary:hover { filter:brightness(1.08); text-decoration:none; }
.btn-ghost { background:transparent; color:var(--fg); border-color:var(--line); }
.btn-ghost:hover { border-color:var(--accent); text-decoration:none; }
.btn-light { background:#fff; color:var(--light-fg); }
.btn-light:hover { background:#eef1f7; text-decoration:none; }
.btn-block { width:100%; }

/* ---------- Hero ---------- */
.hero { padding:72px 0 56px; background:
  radial-gradient(1200px 400px at 70% -10%, rgba(91,140,255,.18), transparent 60%), var(--bg); }
.hero h1 { font-size:40px; max-width:760px; }
.hero .lead { font-size:17px; color:var(--mut); max-width:680px; }
.hero-cta { display:flex; gap:14px; flex-wrap:wrap; margin-top:24px; }
.hero-grid { display:grid; grid-template-columns:1.1fr .9fr; gap:40px; align-items:center; }
.hero-visual {
  border:1px solid var(--line); border-radius:14px; background:var(--panel);
  box-shadow:var(--shadow); padding:18px; min-height:300px;
}
.hero-visual .bar { display:flex; align-items:center; gap:6px; margin-bottom:12px; }
.hero-visual .dot { width:10px; height:10px; border-radius:50%; background:var(--line); }
.hero-visual .chat { display:flex; flex-direction:column; gap:10px; }
.bubble { border-radius:12px; padding:10px 12px; font-size:13px; max-width:85%; }
.bubble.user { background:var(--accent); color:#fff; align-self:flex-end; }
.bubble.agent { background:var(--panel); border:1px solid var(--line); }
.step-row { display:flex; gap:8px; flex-wrap:wrap; margin-top:6px; }
.chip { font-size:11px; padding:2px 10px; border-radius:12px; border:1px solid var(--line); color:var(--mut); }
.chip.tool { color:var(--tool); border-color:rgba(245,166,35,.4); }
.chip.ok { color:var(--ok); border-color:rgba(62,207,142,.4); }

/* ---------- 信任条 ---------- */
.trust { border-top:1px solid var(--line); border-bottom:1px solid var(--line); background:#0c0e12; }
.trust .wrap { display:grid; grid-template-columns:repeat(4,1fr); gap:16px; padding:22px 20px; }
.trust .item { text-align:center; }
.trust .num { font-size:24px; font-weight:700; color:var(--fg); }
.trust .lbl { font-size:12px; color:var(--mut); }

/* ---------- 通用区块 ---------- */
section.block { padding:64px 0; }
.section-head { max-width:720px; margin:0 auto 36px; text-align:center; }
.section-head p { color:var(--mut); }

/* 浅色营销区块 */
.block.light { background:var(--light); color:var(--light-fg); }
.block.light h2 { color:var(--light-fg); }
.block.light .section-head p { color:var(--light-mut); }
.block.light .eyebrow { color:#2f6bff; }

/* ---------- 产品能力：六步流程 ---------- */
.flow { display:grid; grid-template-columns:repeat(3,1fr); gap:14px; }
.flow .card { background:var(--panel); border:1px solid var(--line); border-radius:14px; padding:18px; }
.flow .card .n { color:var(--accent); font-weight:700; font-size:14px; }
.flow .card h3 { margin:6px 0; }
.flow .card p { color:var(--mut); font-size:13px; margin:0; }

.feat-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:14px; margin-top:26px; }
.feat { background:var(--panel); border:1px solid var(--line); border-radius:14px; padding:18px; }
.feat .ic { width:34px; height:34px; border-radius:9px; background:rgba(91,140,255,.14); color:var(--accent);
  display:grid; place-items:center; margin-bottom:10px; font-size:18px; }
.feat h3 { font-size:15px; }
.feat p { color:var(--mut); font-size:13px; margin:0; }

/* ---------- 定价 ---------- */
.tiers { display:grid; grid-template-columns:repeat(4,1fr); gap:16px; }
.tier { background:#fff; color:var(--light-fg); border:1px solid var(--light-line); border-radius:14px; padding:22px; display:flex; flex-direction:column; }
.tier.featured { border:2px solid var(--accent); box-shadow:0 12px 30px rgba(91,140,255,.25); transform:translateY(-4px); }
.tier .name { font-size:15px; font-weight:700; }
.tier .price { font-size:30px; font-weight:800; margin:8px 0 2px; }
.tier .price small { font-size:14px; font-weight:500; color:var(--light-mut); }
.tier .desc { font-size:13px; color:var(--light-mut); min-height:38px; }
.tier ul { list-style:none; padding:0; margin:14px 0; font-size:13px; color:#2a3140; flex:1; }
.tier li { padding:5px 0; border-bottom:1px dashed var(--light-line); }
.tier li:last-child { border:0; }
.tier .tag { display:inline-block; font-size:11px; padding:2px 10px; border-radius:12px; background:#eef3ff; color:#2f6bff; margin-bottom:8px; }
.tier .tag.priv { background:#fff1e6; color:#c9701a; }
.model-note { display:grid; grid-template-columns:1fr 1fr; gap:16px; margin-top:24px; }
.model-note .box { background:var(--panel); border:1px solid var(--line); border-radius:14px; padding:18px; }
.model-note .box h3 { color:var(--fg); }
.model-note .box p { color:var(--mut); font-size:13px; margin:0; }

/* ---------- 下载 ---------- */
.dl-grid { display:grid; grid-template-columns:1fr 1fr; gap:24px; align-items:center; }
.dl-card { background:var(--panel); border:1px solid var(--line); border-radius:14px; padding:24px; }
.dl-card .ver { color:var(--ok); font-size:13px; font-weight:600; }
.dl-steps { list-style:none; padding:0; margin:14px 0 0; }
.dl-steps li { display:flex; gap:10px; padding:8px 0; border-bottom:1px solid var(--line); color:var(--mut); font-size:13px; }
.dl-steps li b { color:var(--fg); }
.req-box { background:#0c0e12; border:1px solid var(--line); border-radius:14px; padding:20px; }
.req-box h3 { color:var(--fg); }

/* ---------- 加盟 ---------- */
.join-grid { display:grid; grid-template-columns:1fr 1fr; gap:28px; align-items:start; }
.adv-list { list-style:none; padding:0; margin:0; }
.adv-list li { display:flex; gap:12px; padding:12px 0; border-bottom:1px solid var(--light-line); }
.adv-list .ic { flex:0 0 32px; height:32px; border-radius:9px; background:#eef3ff; color:#2f6bff; display:grid; place-items:center; font-size:16px; }
.adv-list h3 { font-size:15px; margin:0 0 2px; color:var(--light-fg); }
.adv-list p { font-size:13px; color:var(--light-mut); margin:0; }
.form-card { background:#fff; border-radius:14px; padding:24px; border:1px solid var(--light-line); }
.field { margin-bottom:14px; }
.field label { display:block; font-size:13px; color:#2a3140; margin-bottom:6px; font-weight:600; }
.field input, .field textarea {
  width:100%; padding:11px 12px; border:1px solid var(--light-line); border-radius:10px;
  font-size:14px; font-family:var(--font); color:var(--light-fg); background:#fff;
  transition:border-color .15s, box-shadow .15s;
}
.field input:focus, .field textarea:focus {
  outline:0; border-color:var(--accent); box-shadow:0 0 0 3px rgba(91,140,255,.15);
}
.field textarea { resize:vertical; min-height:80px; }
.notice { padding:12px 14px; border-radius:10px; font-size:13px; margin-top:8px; display:none; }
.notice.ok { display:block; background:#eafaf2; color:#1f8a5b; border:1px solid #bdebd2; }
.notice.err { display:block; background:#fdecec; color:#c0392b; border:1px solid #f5c6c6; }

/* ---------- 联系 ---------- */
.contact-grid { display:grid; grid-template-columns:1.2fr .8fr; gap:24px; }
.contact-card { background:var(--panel); border:1px solid var(--line); border-radius:14px; padding:24px; }
.contact-card .phone { font-size:26px; font-weight:800; color:var(--fg); letter-spacing:1px; }
.contact-card .row { display:flex; gap:10px; align-items:center; padding:8px 0; color:var(--mut); font-size:14px; }
.wechat-box { background:var(--panel); border:1px solid var(--line); border-radius:14px; padding:20px; text-align:center; }
.wechat-qr { width:160px; height:160px; margin:12px auto; border-radius:12px; background:#0c0e12;
  border:1px dashed var(--line); display:grid; place-items:center; color:var(--mut); font-size:12px; }

/* ---------- 页脚 ---------- */
.site-footer { border-top:1px solid var(--line); background:#0c0e12; padding:30px 0; font-size:13px; color:var(--mut); }
.footer-grid { display:flex; justify-content:space-between; flex-wrap:wrap; gap:16px; }
.footer-grid a { color:var(--mut); }
.footer-grid a:hover { color:var(--fg); }

/* ---------- 响应式 ---------- */
@media (max-width:980px) {
  .hero-grid,.dl-grid,.join-grid,.contact-grid,.model-note { grid-template-columns:1fr; }
  .flow,.feat-grid,.tiers { grid-template-columns:repeat(2,1fr); }
  .trust .wrap { grid-template-columns:repeat(2,1fr); row-gap:18px; }
  .tier.featured { transform:none; }
}
@media (max-width:680px) {
  .nav-links { display:none; position:absolute; top:60px; left:0; right:0; background:var(--bg);
    flex-direction:column; padding:14px 20px; border-bottom:1px solid var(--line); gap:14px; }
  .nav-links.open { display:flex; }
  .nav-toggle { display:block; }
  .nav-cta .btn-ghost { display:none; }
  h1, .hero h1 { font-size:30px; }
  .flow,.feat-grid,.tiers { grid-template-columns:1fr; }
  .hero-visual { min-height:240px; }
}