:root{
  --bg:#f4f7fb; --card:#fff; --txt:#0f172a; --muted:#64748b;
  --pri:#2563eb; --pri2:#7c3aed; --ok:#16a34a; --warn:#f59e0b; --bad:#ef4444;
  --line:#e6ebf3; --radius:16px;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  background:radial-gradient(1200px 600px at 80% -10%,#e8f0ff 0%,transparent 60%),var(--bg);
  color:var(--txt); line-height:1.6; -webkit-font-smoothing:antialiased;
}
a{color:var(--pri);text-decoration:none}
.wrap{max-width:1120px;margin:0 auto;padding:0 18px}
.topbar{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.86);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.topbar-in{display:flex;align-items:center;justify-content:space-between;height:62px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;color:var(--txt);font-size:17px}
.brand .logo{width:32px;height:32px;border-radius:10px;background:linear-gradient(135deg,var(--pri),var(--pri2));color:#fff;display:grid;place-items:center;font-weight:700;font-size:16px}
.nav{display:flex;gap:6px;flex-wrap:wrap}
.nav a{padding:7px 12px;border-radius:10px;color:var(--muted);font-size:14px}
.nav a:hover{background:#eef4ff;color:var(--pri)}
.nav a.on{background:linear-gradient(135deg,var(--pri),var(--pri2));color:#fff}
.main{padding:26px 18px 40px}
.notice{background:#fff7e6;border:1px solid #ffe1a8;color:#8a5a00;border-radius:12px;padding:10px 14px;margin:14px 0;font-size:14px}

.hero{text-align:center;padding:34px 16px 22px}
.hero h1{font-size:30px;letter-spacing:-.5px;background:linear-gradient(135deg,#1e3a8a,#6d28d9);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{color:var(--muted);margin-top:8px}
.hero.small{padding:22px 16px 10px}
.search{display:flex;gap:10px;max-width:640px;margin:20px auto 0}
.search input{flex:1;height:46px;border-radius:12px;border:1px solid var(--line);background:#fff;padding:0 16px;font-size:14px;outline:none}
.search input:focus{border-color:#a5b4fc;box-shadow:0 0 0 4px #e0e7ff}
.search button{height:46px;padding:0 22px;border:none;border-radius:12px;color:#fff;background:linear-gradient(135deg,var(--pri),var(--pri2));font-size:14px;cursor:pointer}
.search button.ghost{background:#eef2ff;color:var(--pri)}
.mt8{margin-top:8px}.mt12{margin-top:12px}.mt16{margin-top:16px}

.chips{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0 6px}
.chip{padding:6px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:13px;color:var(--muted)}
.chip.on{background:#111827;color:#fff;border-color:#111827}

.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:14px;margin-top:14px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:0 6px 20px rgba(15,23,42,.04);transition:.18s}
.grid .card:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(15,23,42,.09);border-color:#dbe4f3}
.card-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
.badge{display:inline-block;background:#eef2ff;color:#4338ca;font-size:12px;padding:2px 9px;border-radius:8px;font-weight:600}
.cid{color:#94a3b8;font-size:12px}
.card h3{font-size:15px;line-height:1.5;font-weight:600;min-height:44px}
.desc{color:var(--muted);font-size:13px;margin-top:6px;min-height:38px}
.card-foot{display:flex;justify-content:space-between;align-items:center;margin-top:12px;padding-top:12px;border-top:1px dashed var(--line)}
.price{color:#e11d48;font-size:22px;font-weight:700}
.price small{font-size:13px;margin-right:2px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;height:38px;padding:0 16px;border-radius:10px;background:linear-gradient(135deg,var(--pri),var(--pri2));color:#fff;border:none;font-size:14px;cursor:pointer}
.btn:hover{opacity:.92}
.btn.big{height:50px;padding:0 26px;font-size:16px;font-weight:600}
.btn.small{height:32px;padding:0 12px;font-size:13px}
.btn.ghost{background:#eef2ff;color:var(--pri)}
.btn.full{width:100%}
.pager{display:flex;gap:14px;justify-content:center;align-items:center;padding:22px 0;color:var(--muted);font-size:14px}
.pager a{padding:6px 14px;background:#fff;border:1px solid var(--line);border-radius:10px}
.empty{padding:50px;text-align:center;color:var(--muted);background:#fff;border-radius:var(--radius);border:1px dashed var(--line)}
.foot-tip{text-align:center;padding:20px 0}
.muted{color:var(--muted)}
.small{font-size:12.5px}
.center{text-align:center}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:12.5px}

/* 下单页 */
.backlink{display:inline-block;margin-bottom:12px;color:var(--muted);font-size:14px}
.order-wrap{display:grid;grid-template-columns:1.5fr .9fr;gap:16px;align-items:start}
@media(max-width:860px){.order-wrap{grid-template-columns:1fr}}
.order-main h2{font-size:19px;line-height:1.5}
.prod-meta{display:flex;gap:10px;align-items:center;margin:8px 0 14px}
.price-inline{color:#e11d48;font-weight:700;font-size:18px;margin-left:auto}
.notice-spec{background:#f8fafc;border:1px solid var(--line);border-radius:12px;padding:12px 14px;font-size:13px;color:#334155;margin-bottom:16px;max-height:180px;overflow:auto}
.field{margin-bottom:14px}
.field label{display:block;font-size:13.5px;margin-bottom:6px;font-weight:500}
.field input[type=text],.field input[type=password],.field textarea{
  width:100%;border:1px solid var(--line);border-radius:11px;background:#fff;padding:11px 14px;font-size:14px;outline:none;font-family:inherit}
.field input:focus,.field textarea:focus{border-color:#a5b4fc;box-shadow:0 0 0 4px #e0e7ff}
.req{color:#e11d48}
.row-2{display:flex;gap:10px;align-items:center;margin-bottom:14px;flex-wrap:wrap}
.course-box{border:1px solid var(--line);border-radius:12px;padding:12px;margin-bottom:14px;background:#fbfdff}
.course-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;font-size:14px}
.course-list{max-height:240px;overflow:auto;display:flex;flex-direction:column;gap:6px}
.course-item{display:flex;gap:8px;align-items:flex-start;padding:6px 8px;border-radius:8px;font-size:13.5px}
.course-item:hover{background:#eef4ff}
.submit-row{display:flex;justify-content:space-between;align-items:center;gap:14px;margin-top:18px;flex-wrap:wrap}
.pay-hint{font-size:14px;color:var(--muted)}
.pay-hint b{color:#e11d48;font-size:20px}
.steps,.tips{padding-left:18px;color:#334155;font-size:13.5px;margin:8px 0 16px}
.steps li,.tips li{margin-bottom:6px}
.order-side h3{font-size:15px;margin-top:4px}

/* 支付页 */
.pay-wrap{display:grid;grid-template-columns:1.4fr .9fr;gap:16px;align-items:start}
@media(max-width:860px){.pay-wrap{grid-template-columns:1fr}}
.pay-head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}
.pay-amount{font-size:40px;font-weight:800;color:#e11d48;letter-spacing:-1px}
.countdown{background:#fff7ed;color:#c2410c;border:1px solid #fed7aa;border-radius:12px;padding:8px 14px;font-size:14px}
.pay-tabs{display:flex;gap:8px;margin:18px 0 12px}
.tab{flex:1;height:40px;border-radius:11px;border:1px solid var(--line);background:#fff;cursor:pointer;font-size:14px;color:var(--muted)}
.tab.on{background:#111827;color:#fff;border-color:#111827}
.qr-box{display:grid;place-items:center;padding:14px;border:1px solid var(--line);border-radius:14px;background:#fff;min-height:240px}
.qr-box img{width:220px;height:220px;object-fit:contain;border-radius:8px}
.qr-empty{color:var(--muted);font-size:14px}
.pay-foot{display:flex;gap:12px;align-items:center;justify-content:center;margin-top:16px}
.status{color:var(--muted);font-size:13.5px}
.pay-state{padding:16px;border-radius:14px;text-align:center;font-size:18px;font-weight:700;margin-bottom:14px}
.pay-state.ok{background:#ecfdf5;color:#065f46}
.pay-state.bad{background:#fef2f2;color:#991b1b}
.kv{width:100%;border-collapse:collapse;font-size:13.5px}
.kv th{text-align:left;color:var(--muted);font-weight:500;padding:7px 0;width:78px;vertical-align:top}
.kv td{padding:7px 0;word-break:break-all}

/* 查单 */
.order-card{margin-bottom:14px}
.oc-head{display:flex;justify-content:space-between;align-items:flex-start;gap:10px}
.oc-no{font-family:ui-monospace,monospace;font-size:15px;font-weight:600}
.oc-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:10px;margin-top:12px}
.oc-grid th{display:block;font-weight:500;color:var(--muted);font-size:12px}
.oc-grid b{font-size:14px}
.oc-note{margin-top:10px;background:#f8fafc;border-radius:10px;padding:10px;font-size:13px}
.oc-foot{margin-top:12px}
.pill{display:inline-block;padding:3px 10px;border-radius:999px;font-size:12.5px;font-weight:600}
.pill.ok{background:#ecfdf5;color:#047857}
.pill.wait{background:#fff7ed;color:#c2410c}
.pill.bad{background:#fef2f2;color:#b91c1c}

/* 后台 */
.admin-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}
.admin-actions{display:flex;gap:8px}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-bottom:16px}
.stat{background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px 16px}
.stat span{display:block;color:var(--muted);font-size:12.5px;margin-bottom:4px}
.stat b{font-size:22px}
.table-card{overflow:auto}
.table{width:100%;border-collapse:collapse;font-size:13px}
.table th{text-align:left;color:var(--muted);font-weight:500;padding:10px 8px;border-bottom:1px solid var(--line);white-space:nowrap}
.table td{padding:10px 8px;border-bottom:1px solid #f1f5f9;vertical-align:middle}
.table tr:hover td{background:#fafcff}
.ell{max-width:200px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.link{color:var(--pri);font-size:13px}
.admin-cols{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:16px}
@media(max-width:860px){.admin-cols{grid-template-columns:1fr}}
.admin-cols h3,.card h3{font-size:15px;margin-bottom:12px}
.code-box{background:#0f172a;color:#a5f3fc;border-radius:10px;padding:12px;font-size:12px;word-break:break-all;font-family:ui-monospace,monospace;line-height:1.8}
.qr-thumb{width:80px;height:80px;object-fit:contain;border:1px solid var(--line);border-radius:8px;margin-top:8px;display:block}
.pre{background:#0f172a;color:#e2e8f0;padding:12px;border-radius:10px;font-size:12px;overflow:auto;white-space:pre-wrap;word-break:break-all}
.err{color:#b91c1c;margin-bottom:10px}
.card.narrow{max-width:380px;margin:60px auto}
.narrow .field{margin-bottom:12px}

/* footer */
.foot{border-top:1px solid var(--line);background:#fff;margin-top:20px}
.foot-in{display:flex;justify-content:space-between;gap:20px;padding:24px 18px;flex-wrap:wrap;font-size:13px}
.foot p{margin-top:4px}

/* tutorial */
.doc{max-width:860px;margin:0 auto}
.doc h2{font-size:22px;margin:22px 0 10px}
.doc h3{font-size:17px;margin:20px 0 8px}
.doc p,.doc li{font-size:14.5px;color:#1f2937}
.doc ol,.doc ul{padding-left:22px;margin:8px 0}
.doc li{margin:6px 0}
.doc .step{display:flex;gap:12px;margin:14px 0;background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px 16px}
.doc .step .n{flex:0 0 30px;height:30px;border-radius:50%;background:linear-gradient(135deg,var(--pri),var(--pri2));color:#fff;display:grid;place-items:center;font-weight:700;font-size:14px}
.doc code{background:#eef2ff;color:#3730a3;padding:1px 6px;border-radius:6px;font-size:13px}
.doc .warn{background:#fff7ed;border:1px solid #fed7aa;color:#9a3412;border-radius:12px;padding:12px 14px;margin:12px 0;font-size:13.5px}
.doc .tip{background:#eff6ff;border:1px solid #bfdbfe;color:#1e3a8a;border-radius:12px;padding:12px 14px;margin:12px 0;font-size:13.5px}