:root{
  --brand:#2563eb; --brand-d:#1d4ed8; --brand-l:#eff6ff;
  --ink:#0f172a; --ink-2:#334155; --muted:#64748b; --line:#e2e8f0;
  --bg:#f8fafc; --card:#fff; --ok:#16a34a; --warn:#ea580c; --danger:#dc2626;
  --radius:14px; --shadow:0 1px 3px rgba(15,23,42,.06),0 8px 24px rgba(15,23,42,.05);
  --max:1200px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:none;cursor:pointer;
  font-size:15px;font-weight:600;padding:11px 22px;border-radius:10px;transition:.15s;white-space:nowrap}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-d)}
.btn-ghost{background:#fff;color:var(--ink);border:1px solid var(--line)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand)}
.btn-lg{padding:14px 30px;font-size:16px}
.btn-block{width:100%}
.btn:disabled{opacity:.5;cursor:not-allowed}

/* header */
.topbar{background:#0b1220;color:#cbd5e1;font-size:13px}
.topbar .wrap{display:flex;justify-content:space-between;height:36px;align-items:center}
.header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.9);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header .wrap{display:flex;align-items:center;gap:28px;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;letter-spacing:-.02em}
.logo .mark{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,var(--brand),#7c3aed);
  display:grid;place-items:center;color:#fff;font-size:18px}
.nav{display:flex;gap:22px;margin-left:6px}
.nav a{color:var(--ink-2);font-weight:500;font-size:15px;padding:4px 0;border-bottom:2px solid transparent}
.nav a:hover,.nav a.active{color:var(--brand);border-color:var(--brand)}
.header-actions{margin-left:auto;display:flex;align-items:center;gap:14px}
.cart-link{position:relative;font-size:22px}
.cart-badge{position:absolute;top:-8px;right:-10px;background:var(--danger);color:#fff;font-size:11px;
  font-weight:700;min-width:18px;height:18px;padding:0 5px;border-radius:9px;display:grid;place-items:center}

/* hero */
.hero{background:radial-gradient(1000px 400px at 80% -10%,#dbeafe,transparent),linear-gradient(180deg,#fff,var(--bg));
  padding:64px 0 48px;border-bottom:1px solid var(--line)}
.hero .wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
.hero h1{font-size:44px;line-height:1.15;letter-spacing:-.03em;margin-bottom:18px}
.hero h1 span{background:linear-gradient(135deg,var(--brand),#7c3aed);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{font-size:18px;color:var(--muted);margin-bottom:28px;max-width:520px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.hero-visual{background:var(--card);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);
  padding:34px;text-align:center}
.hero-visual .big{font-size:96px;line-height:1}
.hero-visual .cap{margin-top:14px;font-weight:700;font-size:18px}
.hero-visual .sub{color:var(--muted);font-size:14px}
.trust{display:flex;gap:26px;margin-top:26px;flex-wrap:wrap}
.trust div{display:flex;align-items:center;gap:8px;color:var(--ink-2);font-size:14px;font-weight:500}

/* sections */
.section{padding:56px 0}
.section-head{text-align:center;margin-bottom:38px}
.section-head h2{font-size:32px;letter-spacing:-.02em}
.section-head p{color:var(--muted);margin-top:8px}
.sec-alt{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}

/* category chips */
.cats{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-bottom:34px}
.chip{padding:8px 18px;border-radius:999px;border:1px solid var(--line);background:#fff;font-weight:600;
  font-size:14px;color:var(--ink-2)}
.chip:hover,.chip.active{background:var(--brand);color:#fff;border-color:var(--brand)}

/* product grid */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  transition:.18s;display:flex;flex-direction:column}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#cbd5e1}
.card .thumb{height:180px;background:linear-gradient(135deg,#f1f5f9,#e2e8f0);display:grid;place-items:center;
  font-size:72px;position:relative}
.card .badge{position:absolute;top:12px;left:12px;background:var(--warn);color:#fff;font-size:12px;
  font-weight:700;padding:3px 10px;border-radius:6px}
.card .body{padding:16px 16px 18px;display:flex;flex-direction:column;flex:1}
.card .name{font-weight:700;font-size:16px;margin-bottom:4px;line-height:1.35}
.card .desc{color:var(--muted);font-size:13px;margin-bottom:14px;flex:1;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.price{display:flex;align-items:baseline;gap:8px}
.price .now{color:var(--danger);font-weight:800;font-size:22px}
.price .now::before{content:"¥";font-size:14px;font-weight:700}
.price .was{color:var(--muted);text-decoration:line-through;font-size:14px}
.card .foot{display:flex;align-items:center;justify-content:space-between;margin-top:12px}

/* plans */
.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;align-items:stretch}
.plan{background:#fff;border:1px solid var(--line);border-radius:16px;padding:30px 26px;display:flex;
  flex-direction:column;position:relative}
.plan.rec{border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-l);transform:scale(1.02)}
.plan .tag{position:absolute;top:-13px;left:50%;transform:translateX(-50%);background:var(--brand);color:#fff;
  font-size:12px;font-weight:700;padding:4px 14px;border-radius:999px}
.plan h3{font-size:20px}
.plan .tagline{color:var(--muted);font-size:14px;margin:4px 0 18px}
.plan .amt{font-size:38px;font-weight:800;letter-spacing:-.02em}
.plan .amt small{font-size:15px;color:var(--muted);font-weight:500}
.plan .amt::before{content:"¥";font-size:20px;vertical-align:6px;margin-right:2px}
.plan ul{list-style:none;margin:20px 0;flex:1}
.plan li{padding:7px 0;padding-left:26px;position:relative;color:var(--ink-2);font-size:14px}
.plan li::before{content:"✓";position:absolute;left:0;color:var(--ok);font-weight:800}

/* detail */
.detail{display:grid;grid-template-columns:1fr 1fr;gap:40px;margin:34px 0}
.detail .gallery{background:linear-gradient(135deg,#f1f5f9,#e2e8f0);border-radius:18px;height:420px;
  display:grid;place-items:center;font-size:180px;border:1px solid var(--line)}
.detail h1{font-size:30px;letter-spacing:-.02em}
.detail .sub{color:var(--muted);font-size:16px;margin:8px 0 20px}
.detail .buy-price{background:var(--brand-l);border-radius:12px;padding:18px 22px;margin:18px 0}
.qty{display:inline-flex;border:1px solid var(--line);border-radius:10px;overflow:hidden}
.qty button{width:40px;height:44px;border:none;background:#f8fafc;font-size:18px;cursor:pointer}
.qty input{width:56px;text-align:center;border:none;border-left:1px solid var(--line);border-right:1px solid var(--line);font-size:16px}
.hl{list-style:none;margin:20px 0}
.hl li{padding:8px 0;padding-left:28px;position:relative;color:var(--ink-2)}
.hl li::before{content:"▹";position:absolute;left:4px;color:var(--brand);font-weight:800}
.spec-table{width:100%;border-collapse:collapse;margin-top:14px;background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.spec-table th,.spec-table td{padding:12px 16px;text-align:left;border-bottom:1px solid var(--line);font-size:14px}
.spec-table th{background:#f8fafc;color:var(--muted);width:140px;font-weight:600}
.spec-table tr:last-child th,.spec-table tr:last-child td{border-bottom:none}

/* cart / tables */
.tbl{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.tbl th,.tbl td{padding:14px 16px;border-bottom:1px solid var(--line);text-align:left;font-size:14px}
.tbl th{background:#f8fafc;color:var(--muted);font-weight:600;font-size:13px}
.tbl tr:last-child td{border-bottom:none}
.tbl .pname{display:flex;align-items:center;gap:12px;font-weight:600}
.tbl .pico{width:44px;height:44px;border-radius:9px;background:#f1f5f9;display:grid;place-items:center;font-size:24px}
.summary{background:#fff;border:1px solid var(--line);border-radius:14px;padding:24px}
.summary .row{display:flex;justify-content:space-between;padding:8px 0;color:var(--ink-2)}
.summary .total{border-top:1px solid var(--line);margin-top:10px;padding-top:14px;font-size:15px}
.summary .total b{font-size:26px;color:var(--danger)}
.empty{text-align:center;padding:80px 20px;color:var(--muted)}
.empty .ico{font-size:64px;margin-bottom:14px}

/* forms */
.field{margin-bottom:16px}
.field label{display:block;font-size:14px;font-weight:600;margin-bottom:6px;color:var(--ink-2)}
.field input,.field textarea,.field select{width:100%;padding:11px 14px;border:1px solid var(--line);
  border-radius:10px;font-size:15px;font-family:inherit;background:#fff}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-l)}
.pay-methods{display:flex;gap:12px}
.pay-opt{flex:1;border:1px solid var(--line);border-radius:10px;padding:14px;text-align:center;cursor:pointer;font-weight:600}
.pay-opt input{display:none}
.pay-opt.sel{border-color:var(--brand);background:var(--brand-l);color:var(--brand)}
.alert{padding:12px 16px;border-radius:10px;font-size:14px;margin-bottom:16px}
.alert-err{background:#fef2f2;color:var(--danger);border:1px solid #fecaca}
.alert-info{background:var(--brand-l);color:var(--brand-d);border:1px solid #bfdbfe}

/* pay page */
.pay-box{max-width:560px;margin:40px auto;background:#fff;border:1px solid var(--line);border-radius:16px;
  padding:36px;text-align:center;box-shadow:var(--shadow)}
.pay-box .amt{font-size:44px;font-weight:800;color:var(--danger);margin:10px 0}
.pay-box .amt::before{content:"¥";font-size:24px}
.qr{width:200px;height:200px;margin:24px auto;border:1px solid var(--line);border-radius:12px;
  display:grid;place-items:center;background:#f8fafc;color:var(--muted);font-size:13px;padding:20px}
.status-pill{display:inline-block;padding:3px 12px;border-radius:999px;font-size:12px;font-weight:700}
.st-pending{background:#fff7ed;color:var(--warn)}
.st-paid{background:#f0fdf4;color:var(--ok)}
.st-shipped{background:var(--brand-l);color:var(--brand)}
.st-cancelled{background:#f1f5f9;color:var(--muted)}

/* footer */
.footer{background:#0b1220;color:#94a3b8;padding:48px 0 26px;margin-top:60px;font-size:14px}
.footer .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:30px;padding-bottom:30px;border-bottom:1px solid #1e293b}
.footer h4{color:#e2e8f0;font-size:15px;margin-bottom:14px}
.footer a{display:block;padding:5px 0;color:#94a3b8}
.footer a:hover{color:#fff}
.footer .brand{font-weight:800;font-size:18px;color:#fff;display:flex;align-items:center;gap:8px;margin-bottom:12px}
.footer .copy{padding-top:22px;text-align:center;color:#64748b;font-size:13px;line-height:1.9}
.footer .copy a{display:inline;color:#64748b}
.footer .copy a:hover{color:#94a3b8}

/* misc */
.pagehero{background:#fff;border-bottom:1px solid var(--line);padding:40px 0}
.pagehero h1{font-size:30px}
.breadcrumb{color:var(--muted);font-size:14px;margin:20px 0}
.breadcrumb a:hover{color:var(--brand)}
.prose{background:#fff;border:1px solid var(--line);border-radius:14px;padding:32px;white-space:pre-line;
  color:var(--ink-2);font-size:16px;line-height:2;max-width:820px}

@media(max-width:900px){
  .hero .wrap,.detail{grid-template-columns:1fr}
  .grid,.grid-4,.plans{grid-template-columns:1fr 1fr}
  .footer .cols{grid-template-columns:1fr 1fr}
  .nav{display:none}
  .hero h1{font-size:34px}
}
@media(max-width:560px){
  .grid,.grid-4,.plans{grid-template-columns:1fr}
  .footer .cols{grid-template-columns:1fr}
  .checkout-grid{grid-template-columns:1fr!important}
}