/* ========== 南山云 · 星座网络设计系统(浅色) ========== */
* { margin:0; padding:0; box-sizing:border-box; }
:root {
  --bg:#f8fafd;
  --ink:#0e2a44;
  --ink-85:rgba(14,42,68,.85);
  --ink-70:rgba(14,42,68,.68);
  --ink-55:rgba(14,42,68,.55);
  --ink-40:rgba(14,42,68,.42);
  --glass:rgba(255,255,255,.8);
  --glass-2:#ffffff;
  --line:#dce9f4;
  --accent:#0284c7;
  --accent-2:#38bdf8;
  --radius:18px;
}
html { scroll-behavior:smooth; }
body { font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif; background:var(--bg); color:var(--ink); overflow-x:hidden; line-height:1.6; }
a { color:inherit; }
::selection { background:rgba(2,132,199,.2); }

/* 背景层 */
#bg { position:fixed; inset:0; z-index:0; }

/* 导航 */
.nav { position:fixed; top:0; left:0; right:0; z-index:10; transition:.3s; }
.nav.scrolled { background:rgba(255,255,255,.85); backdrop-filter:blur(18px); border-bottom:1px solid var(--line); box-shadow:0 4px 24px rgba(2,132,199,.06); }
.nav-inner { max-width:1240px; margin:0 auto; display:flex; align-items:center; justify-content:space-between; padding:16px 40px; }
.logo { font-weight:800; font-size:19px; letter-spacing:.5px; text-decoration:none; display:flex; align-items:center; gap:10px; color:var(--ink); }
.logo svg { flex:none; }
.logo-img { display:block; width:180px; height:auto; max-height:46px; object-fit:contain; }
.logo b { color:var(--accent); font-weight:800; }
.nav ul { display:flex; gap:34px; list-style:none; font-size:14.5px; }
.nav ul a { color:#52708c; text-decoration:none; transition:.2s; position:relative; padding:4px 0; }
.nav ul a:hover, .nav ul a.active { color:var(--accent); }
.nav ul a.active::after { content:""; position:absolute; left:50%; bottom:-4px; transform:translateX(-50%); width:16px; height:2px; border-radius:2px; background:linear-gradient(90deg,var(--accent),var(--accent-2)); }
.nav-cta { display:flex; align-items:center; gap:14px; }
.nav-tel { font-size:13.5px; color:#52708c; text-decoration:none; font-family:ui-monospace,monospace; }
.nav-tel:hover { color:var(--accent); }
.phone-popover { position:relative; display:inline-flex; align-items:center; }
.phone-qr { position:absolute; top:calc(100% + 12px); left:50%; transform:translate(-50%,-6px); width:142px; padding:10px; border:1px solid var(--line); border-radius:14px; background:rgba(255,255,255,.96); box-shadow:0 18px 44px rgba(2,24,43,.16); opacity:0; visibility:hidden; pointer-events:none; transition:.2s; text-align:center; }
.phone-qr::before { content:""; position:absolute; left:50%; top:-7px; width:12px; height:12px; transform:translateX(-50%) rotate(45deg); background:rgba(255,255,255,.96); border-left:1px solid var(--line); border-top:1px solid var(--line); }
.phone-qr img { display:block; width:120px; height:120px; object-fit:cover; border-radius:10px; }
.phone-qr span { display:block; margin-top:7px; color:#52708c; font-size:12px; }
.phone-popover:hover .phone-qr { opacity:1; visibility:visible; transform:translate(-50%,0); }

/* 按钮 */
.btn { display:inline-flex; align-items:center; gap:8px; padding:12px 28px; border-radius:12px; font-size:14.5px; text-decoration:none; font-weight:600; transition:.25s; cursor:pointer; border:none; }
.btn-main { background:var(--accent); color:#fff; box-shadow:0 8px 26px rgba(2,132,199,.28); }
.btn-main:hover { background:#0369a1; transform:translateY(-2px); }
.btn-accent { background:linear-gradient(90deg,var(--accent),var(--accent-2)); color:#fff; box-shadow:0 8px 26px rgba(2,132,199,.3); }
.btn-accent:hover { box-shadow:0 12px 34px rgba(2,132,199,.4); transform:translateY(-2px); }
.btn-line { border:1px solid #c3d9ea; color:#3d5a74; background:rgba(255,255,255,.7); }
.btn-line:hover { border-color:var(--accent); color:var(--accent); }
.btn-sm { padding:9px 22px; font-size:13.5px; }

/* 页面骨架 */
main { position:relative; z-index:2; }
.wrap { max-width:1240px; margin:0 auto; padding:0 40px; }
section { position:relative; }

/* Hero */
.hero { min-height:92vh; display:flex; flex-direction:column; align-items:center; justify-content:center; text-align:center; padding:140px 24px 60px; }
.hero-sub { min-height:auto; padding:170px 24px 80px; text-align:center; }
.badge { display:inline-flex; align-items:center; gap:9px; font-size:13px; letter-spacing:2px; color:var(--accent); background:rgba(2,132,199,.07); border:1px solid rgba(2,132,199,.22); padding:8px 20px; border-radius:99px; font-weight:600; }
.badge i { width:8px; height:8px; border-radius:50%; background:#10b981; animation:pulse 1.6s infinite; }
.badge.amber i { background:var(--accent); }
@keyframes pulse { 50%{opacity:.3;} }
.hero h1 { margin-top:30px; font-size:64px; line-height:1.22; font-weight:800; letter-spacing:-1px; color:var(--ink); }
.hero-sub h1 { font-size:52px; margin-top:26px; letter-spacing:-.5px; }
.grad { background:linear-gradient(92deg,#0369a1,#0284c7,#38bdf8); -webkit-background-clip:text; background-clip:text; color:transparent; }
.hero p.lead, .hero-sub p.lead { margin:24px auto 0; max-width:620px; color:var(--ink-70); line-height:2; font-size:16px; }
.cta-row { margin-top:40px; display:flex; gap:16px; justify-content:center; flex-wrap:wrap; }

/* 数据统计条 */
.stats { max-width:1080px; margin:0 auto; padding:0 24px 110px; display:grid; grid-template-columns:repeat(4,1fr); gap:18px; }
.stat { background:var(--glass); border:1px solid var(--line); border-radius:var(--radius); padding:30px 26px; transition:.3s; }
.stat:hover { background:var(--glass-2); transform:translateY(-5px); border-color:var(--accent); box-shadow:0 16px 42px rgba(2,132,199,.12); }
.stat b { font-size:34px; font-family:ui-monospace,monospace; letter-spacing:-.5px; color:var(--ink); }
.stat b em { font-style:normal; color:var(--accent); font-size:20px; margin-left:2px; }
.stat span { display:block; margin-top:10px; font-size:13px; color:var(--ink-55); }

/* 区块标题 */
.sec { padding:100px 0 20px; }
.sec-head { text-align:center; max-width:680px; margin:0 auto 56px; padding:0 24px; }
.sec-head .en { font-size:12.5px; letter-spacing:4px; color:var(--accent); font-family:ui-monospace,monospace; font-weight:600; }
.sec-head h2 { margin-top:14px; font-size:40px; letter-spacing:.5px; color:var(--ink); }
.sec-head p { margin-top:16px; color:var(--ink-70); font-size:15px; line-height:1.9; }

/* 卡片网格 */
.cards { max-width:1240px; margin:0 auto; padding:0 40px; display:grid; gap:20px; }
.cols-3 { grid-template-columns:repeat(3,1fr); }
.cols-4 { grid-template-columns:repeat(4,1fr); }
.card { background:var(--glass); border:1px solid var(--line); border-radius:var(--radius); padding:34px 30px; transition:.35s; position:relative; overflow:hidden; }
.card::before { content:""; position:absolute; top:0; left:0; right:0; height:2px; background:linear-gradient(90deg,var(--accent),var(--accent-2),transparent); opacity:0; transition:.35s; }
.card:hover { background:var(--glass-2); transform:translateY(-6px); border-color:var(--accent); box-shadow:0 18px 46px rgba(2,132,199,.13); }
.card:hover::before { opacity:1; }
.card h3 { margin-top:20px; font-size:19px; letter-spacing:.5px; color:var(--ink); }
.card p { margin-top:12px; font-size:13.5px; color:var(--ink-70); line-height:1.9; }
.card .tags { margin-top:16px; display:flex; flex-wrap:wrap; gap:8px; }
.card .tags i { font-style:normal; font-size:11.5px; padding:4px 12px; border-radius:99px; border:1px solid #c3d9ea; color:#52708c; background:rgba(255,255,255,.6); }
.card .more { display:inline-flex; align-items:center; gap:6px; margin-top:18px; font-size:13px; color:var(--accent); text-decoration:none; font-weight:600; }
.card .more:hover { gap:10px; }
.card .more { transition:.25s; }
.card sup { color:var(--accent) !important; }

/* 自制 SVG 图标 */
.ic { width:52px; height:52px; border-radius:14px; display:flex; align-items:center; justify-content:center;
  background:linear-gradient(135deg,rgba(2,132,199,.09),rgba(56,189,248,.09)); border:1px solid var(--line); }
.ic svg { width:26px; height:26px; stroke:url(#icg); fill:none; stroke-width:1.7; stroke-linecap:round; stroke-linejoin:round; }

/* 图文分栏 */
.split { max-width:1240px; margin:0 auto; padding:0 40px; display:grid; grid-template-columns:1fr 1fr; gap:70px; align-items:center; }
.split h2 { font-size:36px; line-height:1.4; color:var(--ink); }
.split .en { font-size:12.5px; letter-spacing:4px; color:var(--accent); font-family:ui-monospace,monospace; font-weight:600; display:block; margin-bottom:14px; }
.split p { margin-top:18px; color:var(--ink-70); font-size:15px; line-height:2; }
.split .list { margin-top:26px; display:grid; gap:14px; }
.split .list div { display:flex; gap:14px; align-items:flex-start; font-size:14.5px; color:var(--ink-85); }
.split .list svg { flex:none; width:20px; height:20px; stroke:var(--accent); fill:none; stroke-width:2; margin-top:3px; }
.art { border-radius:24px; border:1px solid var(--line); background:var(--glass); padding:36px; box-shadow:0 14px 40px rgba(2,132,199,.08); }
.official-qr { display:block; width:168px; height:168px; object-fit:cover; margin:0 auto; padding:8px; border-radius:18px; background:#fff; box-shadow:0 16px 38px rgba(2,24,43,.12); }

/* 步骤/流程 */
.steps { max-width:1240px; margin:0 auto; padding:0 40px; display:grid; grid-template-columns:repeat(4,1fr); gap:18px; counter-reset:st; }
.step { background:var(--glass); border:1px solid var(--line); border-radius:var(--radius); padding:30px 26px; position:relative; transition:.3s; }
.step:hover { background:var(--glass-2); transform:translateY(-4px); border-color:var(--accent); box-shadow:0 14px 36px rgba(2,132,199,.1); }
.step::before { counter-increment:st; content:"0" counter(st); font-family:ui-monospace,monospace; font-size:13px; color:var(--accent); letter-spacing:2px; font-weight:700; }
.step h3 { margin-top:14px; font-size:17px; color:var(--ink); }
.step p { margin-top:10px; font-size:13px; color:var(--ink-70); line-height:1.8; }

/* 时间线 */
.timeline { max-width:860px; margin:0 auto; padding:0 40px; }
.tl-item { display:grid; grid-template-columns:150px 1fr; gap:30px; padding:30px 0; border-bottom:1px dashed #c3d9ea; }
.tl-item:last-child { border-bottom:none; }
.tl-item .yr { font-family:ui-monospace,monospace; color:var(--accent); font-size:15px; letter-spacing:1px; padding-top:3px; font-weight:700; }
.tl-item h3 { font-size:18px; color:var(--ink); }
.tl-item p { margin-top:8px; font-size:13.5px; color:var(--ink-70); line-height:1.9; }

/* 合作伙伴类型卡 */
.ptier { text-align:center; }
.ptier .ic { margin:0 auto; }

/* 联系页 */
.contact-grid { max-width:1240px; margin:0 auto; padding:0 40px; display:grid; grid-template-columns:repeat(3,1fr); gap:20px; }
.c-card { background:var(--glass); border:1px solid var(--line); border-radius:var(--radius); padding:34px 30px; transition:.3s; }
.c-card:hover { background:var(--glass-2); transform:translateY(-5px); border-color:var(--accent); box-shadow:0 16px 42px rgba(2,132,199,.12); }
.c-card h3 { margin-top:18px; font-size:18px; color:var(--ink); }
.c-card p { margin-top:10px; font-size:14px; color:var(--ink-85); line-height:2; }
.c-card small { display:block; margin-top:6px; font-size:12.5px; color:var(--ink-55); }
.c-card a { color:var(--accent); text-decoration:none; font-weight:600; }
.c-card a:hover { text-decoration:underline; }

/* CTA 横幅 */
.banner-cta { max-width:1080px; margin:110px auto 0; padding:0 24px 110px; }
.banner-cta .box { background:linear-gradient(120deg,rgba(2,132,199,.08),rgba(56,189,248,.1),rgba(125,211,252,.12)); border:1px solid #c3d9ea; border-radius:28px; padding:70px 50px; text-align:center; box-shadow:0 20px 60px rgba(2,132,199,.1); }
.banner-cta h2 { font-size:38px; color:var(--ink); }
.banner-cta p { margin-top:16px; color:var(--ink-70); font-size:15px; }

/* 页脚 */
footer { position:relative; z-index:2; border-top:1px solid var(--line); background:rgba(240,246,251,.9); backdrop-filter:blur(14px); }
.foot-main { max-width:1240px; margin:0 auto; padding:56px 40px 36px; display:grid; grid-template-columns:1.4fr 1fr 1fr 1.2fr; gap:40px; }
.foot-main h4 { font-size:14px; color:var(--ink); margin-bottom:18px; letter-spacing:1px; }
.foot-main ul { list-style:none; display:grid; gap:12px; font-size:13px; }
.foot-main ul a { color:var(--ink-55); text-decoration:none; transition:.2s; }
.foot-main ul a:hover { color:var(--accent); }
.foot-brand p { margin-top:16px; font-size:13px; color:var(--ink-55); line-height:1.9; max-width:300px; }
.foot-contact { font-size:13px; color:var(--ink-55); display:grid; gap:12px; }
.foot-contact a { color:var(--ink-85); text-decoration:none; }
.foot-contact a:hover { color:var(--accent); }
.beian { border-top:1px solid var(--line); padding:22px 40px 30px; text-align:center; font-size:12.5px; color:var(--ink-40); line-height:2.2; }
.beian a { color:var(--ink-55); text-decoration:none; margin:0 6px; }
.beian a:hover { color:var(--accent); }
.beian .ga { display:inline-flex; align-items:center; gap:6px; }

/* 滚动出现动画 */
.rv { opacity:0; transform:translateY(28px); transition:opacity .8s ease, transform .8s cubic-bezier(.2,.8,.2,1); }
.rv.in { opacity:1; transform:none; }

/* 响应式 */
@media (max-width:1024px) {
  .hero h1 { font-size:44px; } .hero-sub h1 { font-size:38px; }
  .sec-head h2 { font-size:30px; } .split h2 { font-size:28px; }
  .cols-4 { grid-template-columns:repeat(2,1fr); }
  .steps { grid-template-columns:repeat(2,1fr); }
  .foot-main { grid-template-columns:1fr 1fr; }
}
@media (max-width:720px) {
  .nav ul, .phone-popover { display:none; }
  .nav-inner { padding:14px 22px; }
  .logo-img { width:152px; max-height:40px; }
  .wrap, .cards, .split, .steps, .timeline, .contact-grid, .foot-main { padding-left:22px; padding-right:22px; }
  .hero h1 { font-size:34px; } .hero-sub h1 { font-size:30px; }
  .cols-3, .cols-4, .split, .steps, .contact-grid, .stats { grid-template-columns:1fr; }
  .split { gap:40px; }
  .banner-cta .box { padding:50px 26px; } .banner-cta h2 { font-size:26px; }
  .tl-item { grid-template-columns:1fr; gap:8px; }
  .foot-main { grid-template-columns:1fr; gap:30px; }
}