:root {
    --bg: #f3f6fb;
    --panel: #ffffff;
    --text: #142033;
    --muted: #64748b;
    --line: #e2e8f0;
    --primary: #4f46e5;
    --primary-dark: #3730a3;
    --primary-soft: #eef2ff;
    --green: #047857;
    --green-soft: #ecfdf5;
    --red: #b91c1c;
    --red-soft: #fef2f2;
    --amber: #b45309;
    --amber-soft: #fffbeb;
    --blue: #0369a1;
    --blue-soft: #f0f9ff;
    --radius: 14px;
    --shadow: 0 8px 30px rgba(15, 23, 42, .06);
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
    font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 14px;
    line-height: 1.6;
}
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }
h1, h2, h3, h4, p { margin-top: 0; }
h1 { font-size: 26px; line-height: 1.25; margin-bottom: 6px; }
h2 { font-size: 20px; margin-bottom: 14px; }
h3 { font-size: 16px; margin-bottom: 12px; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.mono, code, pre { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
code { background: #f1f5f9; padding: 2px 6px; border-radius: 5px; font-size: 12px; }
pre { background: #0f172a; color: #e2e8f0; padding: 18px; border-radius: 12px; overflow: auto; line-height: 1.55; }
pre code { background: transparent; padding: 0; color: inherit; }
.app-shell { display: flex; min-height: 100vh; }
.sidebar {
    width: 238px; flex: 0 0 238px; background: #111827; color: #cbd5e1;
    padding: 22px 15px; position: sticky; top: 0; height: 100vh; overflow-y: auto;
}
.brand { display: flex; align-items: center; gap: 10px; padding: 0 8px 22px; color: #fff; font-weight: 700; font-size: 18px; }
.brand-mark { width: 34px; height: 34px; border-radius: 10px; background: linear-gradient(135deg,#6366f1,#22d3ee); display:grid; place-items:center; color:#fff; font-weight:800; }
.nav-label { font-size: 11px; letter-spacing: .12em; color: #64748b; padding: 16px 10px 7px; text-transform: uppercase; }
.nav a { display:flex; align-items:center; gap: 10px; color:#cbd5e1; padding: 10px 12px; border-radius: 9px; margin: 2px 0; font-weight: 500; }
.nav a:hover, .nav a.active { background: #1f2937; color: #fff; }
.nav-icon { width: 18px; text-align: center; opacity: .9; }
.sidebar-footer { margin-top: 22px; padding: 14px 10px 0; border-top: 1px solid #263244; color:#94a3b8; font-size: 12px; }
.main { flex: 1; min-width: 0; }
.topbar { height: 68px; background: rgba(255,255,255,.85); backdrop-filter: blur(12px); border-bottom: 1px solid var(--line); display:flex; align-items:center; justify-content:space-between; padding: 0 30px; position: sticky; top:0; z-index: 10; }
.topbar-title { font-weight: 650; }
.user-chip { display:flex; align-items:center; gap:9px; color:var(--muted); }
.avatar { width:30px; height:30px; border-radius:50%; background: var(--primary-soft); color:var(--primary); display:grid; place-items:center; font-weight:700; }
.content { padding: 28px 30px 50px; max-width: 1440px; }
.page-head { display:flex; align-items:flex-start; justify-content:space-between; gap:18px; margin-bottom: 22px; }
.page-head p { margin-bottom: 0; color: var(--muted); }
.actions { display:flex; gap:9px; flex-wrap:wrap; align-items:center; }
.grid { display:grid; gap:16px; }
.grid-4 { grid-template-columns: repeat(4, minmax(0,1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0,1fr)); }
.grid-2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
.card { background: var(--panel); border:1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 20px; }
.card-flat { box-shadow:none; }
.stat-label { color:var(--muted); font-size:13px; margin-bottom:8px; }
.stat-value { font-size:28px; font-weight:750; letter-spacing:-.02em; }
.stat-note { color:var(--muted); font-size:12px; margin-top:4px; }
.stat-icon { width:40px; height:40px; border-radius:12px; display:grid; place-items:center; background:var(--primary-soft); color:var(--primary); font-size:19px; margin-bottom:15px; }
.alert { border-radius: 11px; padding: 12px 14px; margin-bottom: 16px; border:1px solid transparent; }
.alert-success { background:var(--green-soft); color:var(--green); border-color:#a7f3d0; }
.alert-error { background:var(--red-soft); color:var(--red); border-color:#fecaca; }
.alert-warning { background:var(--amber-soft); color:var(--amber); border-color:#fde68a; }
.alert-info { background:var(--blue-soft); color:var(--blue); border-color:#bae6fd; }
.btn { display:inline-flex; align-items:center; justify-content:center; gap:7px; appearance:none; border:1px solid transparent; border-radius:9px; padding:9px 14px; font:inherit; font-weight:600; line-height:1.3; cursor:pointer; background:#f1f5f9; color:var(--text); transition:.15s ease; white-space:nowrap; }
.btn:hover { transform: translateY(-1px); }
.btn-primary { background:var(--primary); color:#fff; }
.btn-primary:hover { background:var(--primary-dark); color:#fff; }
.btn-success { background:#059669; color:#fff; }
.btn-danger { background:#dc2626; color:#fff; }
.btn-outline { background:#fff; border-color:var(--line); color:var(--text); }
.btn-sm { padding:6px 10px; font-size:12px; border-radius:7px; }
.btn-block { width:100%; }
.table-wrap { overflow-x:auto; }
table { width:100%; border-collapse: collapse; }
th, td { padding: 12px 12px; border-bottom:1px solid var(--line); text-align:left; vertical-align: middle; }
th { font-size:12px; text-transform:uppercase; letter-spacing:.04em; color:var(--muted); font-weight:650; background:#f8fafc; white-space:nowrap; }
tbody tr:hover { background:#fafbff; }
td:last-child, th:last-child { text-align:right; }
tr:last-child td { border-bottom:0; }
.badge { display:inline-flex; align-items:center; gap:5px; border-radius:999px; padding:3px 9px; font-size:12px; font-weight:650; background:#f1f5f9; color:#475569; white-space:nowrap; }
.badge-paid, .badge-success, .badge-active { background:var(--green-soft); color:var(--green); }
.badge-pending { background:var(--amber-soft); color:var(--amber); }
.badge-failed, .badge-closed, .badge-disabled { background:var(--red-soft); color:var(--red); }
.badge-refunded, .badge-partially_refunded, .badge-refunding { background:var(--blue-soft); color:var(--blue); }
.badge-mock { background:#f5f3ff; color:#6d28d9; }
.form-grid { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:18px; }
.form-grid .full { grid-column:1/-1; }
.field label { display:block; font-weight:650; margin-bottom:7px; }
.field .help { color:var(--muted); font-size:12px; margin-top:6px; }
input[type="text"], input[type="password"], input[type="number"], input[type="url"], input[type="email"], select, textarea {
    width:100%; border:1px solid #cbd5e1; border-radius:9px; padding:10px 12px; font:inherit; color:var(--text); background:#fff; outline:none; transition:.15s ease;
}
input:focus, select:focus, textarea:focus { border-color:var(--primary); box-shadow:0 0 0 3px rgba(79,70,229,.10); }
textarea { min-height:120px; resize:vertical; }
textarea.code { min-height:180px; font-family:ui-monospace, Menlo, Consolas, monospace; font-size:12px; }
.check { display:flex; align-items:center; gap:8px; font-weight:500; }
.check input { width:17px; height:17px; }
.copy-row { display:flex; gap:8px; }
.copy-row input { background:#f8fafc; }
.filters { display:flex; gap:10px; flex-wrap:wrap; align-items:end; }
.filters .field { min-width:150px; }
.filters .field.grow { flex:1; min-width:220px; }
.pagination { display:flex; gap:8px; justify-content:flex-end; margin-top:16px; }
.kv { display:grid; grid-template-columns:150px 1fr; gap:10px 18px; }
.kv dt { color:var(--muted); }
.kv dd { margin:0; word-break:break-all; }
.section-gap { margin-top:20px; }
.method { display:inline-block; font-size:11px; font-weight:800; border-radius:5px; padding:2px 6px; background:#e2e8f0; color:#334155; }
.method-get { background:#ecfdf5; color:#047857; }
.method-post { background:#eef2ff; color:#4338ca; }
.hero { background:linear-gradient(135deg,#111827,#312e81 60%,#155e75); color:#fff; border-radius:20px; padding:28px; margin-bottom:20px; position:relative; overflow:hidden; }
.hero:after { content:""; position:absolute; width:260px; height:260px; border-radius:50%; right:-90px; top:-120px; background:rgba(99,102,241,.25); }
.hero h1 { font-size:30px; max-width:700px; }
.hero p { color:#c7d2fe; max-width:720px; margin-bottom:0; }
.hero .actions { margin-top:18px; }
.empty { text-align:center; color:var(--muted); padding:42px 20px; }
.empty-icon { font-size:34px; margin-bottom:10px; }
.code-inline { display:inline-flex; gap:6px; align-items:center; }
.docs h2 { margin-top:30px; }
.docs h3 { margin-top:22px; }
.docs ul { padding-left:22px; }
.login-body { min-height:100vh; display:grid; place-items:center; padding:30px; background:radial-gradient(circle at 15% 15%,#e0e7ff,transparent 35%),radial-gradient(circle at 90% 80%,#cffafe,transparent 30%),var(--bg); }
.login-card { width:min(100%,430px); background:#fff; border:1px solid var(--line); border-radius:20px; box-shadow:0 20px 60px rgba(15,23,42,.10); padding:34px; }
.login-brand { display:flex; align-items:center; gap:11px; margin-bottom:24px; font-weight:750; font-size:19px; }
.public-body { min-height:100vh; display:grid; place-items:center; padding:24px; background:radial-gradient(circle at 20% 20%,#e0e7ff,transparent 34%),radial-gradient(circle at 80% 80%,#cffafe,transparent 30%),#f8fafc; }
.pay-card { width:min(100%,520px); background:#fff; border:1px solid var(--line); border-radius:22px; box-shadow:0 20px 60px rgba(15,23,42,.10); overflow:hidden; }
.pay-head { padding:26px 28px; background:linear-gradient(135deg,#111827,#3730a3); color:#fff; }
.pay-head .muted { color:#c7d2fe; }
.pay-body { padding:28px; text-align:center; }
.pay-amount { font-size:38px; font-weight:800; letter-spacing:-.03em; margin:8px 0; }
.pay-status { margin:18px 0; }
.qr-box { display:inline-flex; padding:14px; border:1px solid var(--line); border-radius:16px; background:#fff; margin:12px 0; }
.qr-box img, .qr-box canvas { max-width:240px; height:auto; }
.pay-detail { background:#f8fafc; border-radius:12px; padding:14px; text-align:left; margin:18px 0; }
.pay-detail div { display:flex; justify-content:space-between; gap:12px; padding:5px 0; }
.pay-detail span:first-child { color:var(--muted); }
.pay-detail span:last-child { word-break:break-all; text-align:right; }
.footer-note { text-align:center; color:var(--muted); font-size:12px; margin-top:18px; }
@media (max-width: 1100px) { .grid-4 { grid-template-columns:repeat(2,minmax(0,1fr)); } .grid-3 { grid-template-columns:repeat(2,minmax(0,1fr)); } }
@media (max-width: 820px) {
    .app-shell { display:block; }
    .sidebar { width:100%; height:auto; position:static; padding:15px; }
    .brand { padding-bottom:12px; }
    .nav { display:flex; flex-wrap:wrap; gap:4px; }
    .nav-label, .sidebar-footer { display:none; }
    .nav a { padding:8px 10px; }
    .content { padding:20px 15px 40px; }
    .topbar { padding:0 15px; }
    .grid-4, .grid-3, .grid-2, .form-grid { grid-template-columns:1fr; }
    .page-head { display:block; }
    .page-head .actions { margin-top:14px; }
    .kv { grid-template-columns:1fr; gap:2px; }
    .kv dd { margin-bottom:12px; }
}