:root{
  --bg:#f6f8fb; --surface:#ffffff; --surface-2:#f1f5f9; --line:#e3e9f1;
  --text:#0f172a; --muted:#64748b; --faint:#94a3b8;
  --brand:#2563eb; --brand-dark:#1d4ed8; --brand-soft:#eff6ff;
  --teal:#0f766e; --teal-soft:#ecfdf5;
  --amber:#b45309; --amber-soft:#fffbeb;
  --red:#b91c1c; --red-soft:#fef2f2;
  --green:#15803d; --green-soft:#f0fdf4;
  --radius:14px; --radius-sm:9px;
  --shadow:0 1px 2px rgba(15,23,42,.04),0 8px 24px rgba(15,23,42,.045);
}
/* 深色主题：只覆盖变量与少量硬编码表面，保持所有组件自动适配 */
body.theme-dark{
  --bg:#0b1220; --surface:#131d30; --surface-2:#1b2942; --line:#28374f;
  --text:#e9f0fb; --muted:#9bacc6; --faint:#71829d;
  --brand:#60a5fa; --brand-dark:#93c5fd; --brand-soft:#1c3a60;
  --teal:#5eead4; --teal-soft:#123b38;
  --amber:#fbbf24; --amber-soft:#3b2d12;
  --red:#f87171; --red-soft:#3a1e1e;
  --green:#4ade80; --green-soft:#153524;
  --shadow:0 1px 2px rgba(0,0,0,.28),0 8px 24px rgba(0,0,0,.24);
}
body.theme-dark .site-header{background:rgba(19,29,48,.94)}
body.theme-dark .subnav{background:var(--surface)}
body.theme-dark .demo-bar{background:var(--amber-soft);border-bottom-color:#6b511c}
body.theme-dark .notice-bar{background:var(--brand-soft);border-bottom-color:#2f5c94}
body.theme-dark input,body.theme-dark select,body.theme-dark textarea{background:var(--surface-2);color:var(--text);border-color:var(--line)}
body.theme-dark code,body.theme-dark pre{background:var(--surface-2);color:var(--text)}
body.theme-dark .table-scroll::-webkit-scrollbar-thumb{background:#3b4d6b}

/* 次级导航 */
.subnav{border-top:1px solid var(--line);background:var(--surface)}
.subnav-inner{display:flex;gap:14px;align-items:center;height:36px;overflow-x:auto;font-size:12.5px;white-space:nowrap;scrollbar-width:thin}
.subnav a{color:var(--muted)}
.subnav a:hover{color:var(--brand)}
.subnav-label{color:var(--faint);font-weight:700;flex:none}
.subnav-spacer{flex:1;min-width:8px}
.theme-toggle{width:32px;height:32px;border-radius:9px;border:1px solid var(--line);background:var(--surface-2);color:var(--muted);cursor:pointer;font-size:16px;line-height:1;flex:none}
.theme-toggle:hover{color:var(--brand);border-color:var(--brand)}

/* 筛选条 / 分类 Tab / 统计条 */
.filter-bar{margin:0 0 16px}
.filter-row{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-bottom:12px}
.filter-row select{min-width:130px}
.filter-search{flex:1;min-width:210px}
.tabbar{display:flex;gap:6px;flex-wrap:wrap;margin:0 0 16px}
.tab{display:inline-flex;align-items:center;padding:6px 12px;border-radius:8px;border:1px solid var(--line);background:var(--surface);color:var(--muted);font-size:13px;font-weight:600}
.tab:hover{color:var(--brand);border-color:var(--brand)}
.tab.active{background:var(--brand-soft);border-color:var(--brand);color:var(--brand)}
.stat-strip{display:grid;grid-template-columns:repeat(auto-fit,minmax(155px,1fr));gap:10px;margin:14px 0 18px}
.stat-item{display:flex;flex-direction:column;gap:3px;padding:12px 14px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface)}
.stat-item strong{font-size:17px;line-height:1.35}
.head-actions{display:flex;gap:8px;flex-wrap:wrap}
.guide-link{display:block;color:var(--text)}
.guide-link:hover{color:var(--text);border-color:var(--brand)}
.prose{line-height:1.9}
.badge-red{background:var(--red-soft);color:var(--red)}
.badge-amber{background:var(--amber-soft);color:var(--amber)}
/* 中转站卡片 */
.transit-card{display:flex;flex-direction:column;gap:2px}
.transit-card-head{display:flex;justify-content:space-between;gap:12px;align-items:flex-start}
.transit-card-head h3{margin-bottom:4px}
.transit-rate{display:flex;flex-direction:column;align-items:flex-end;font-size:24px;font-weight:800;color:var(--brand);line-height:1.2;white-space:nowrap}
.transit-rate .small{font-size:11px;font-weight:600}
.family-tags{display:flex;gap:6px;flex-wrap:wrap;margin-top:6px}
.tag{display:inline-block;padding:3px 9px;border:1px solid var(--line);border-radius:999px;background:var(--surface-2);color:var(--muted);font-size:12px}
.transit-card-foot{display:flex;justify-content:space-between;align-items:center;gap:10px}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font:15px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}
a{color:var(--brand);text-decoration:none}
a:hover{color:var(--brand-dark)}
h1,h2,h3,h4{line-height:1.3;margin:0 0 .6em;font-weight:700;letter-spacing:-.01em}
h1{font-size:34px}h2{font-size:24px}h3{font-size:18px}h4{font-size:15px}
p{margin:0 0 1em}
ul{margin:0 0 1em;padding-left:1.3em}
code{background:var(--surface-2);padding:.15em .4em;border-radius:5px;font-size:.9em}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;gap:28px;height:64px}
.brand{display:inline-flex;align-items:center;gap:9px;color:var(--text);font-weight:800;font-size:18px;white-space:nowrap}
.brand:hover{color:var(--text)}
.brand-mark{display:grid;place-items:center;width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,var(--brand),#0ea5e9);color:#fff;font-size:17px}
.main-nav{display:flex;gap:4px;flex:1;flex-wrap:wrap}
.main-nav a{padding:7px 11px;border-radius:8px;color:var(--muted);font-size:14px;font-weight:600;white-space:nowrap}
.main-nav a:hover{background:var(--surface-2);color:var(--text)}
.main-nav a.active{background:var(--brand-soft);color:var(--brand)}
.header-actions{display:flex;gap:7px;align-items:center}
.demo-bar{background:var(--amber-soft);border-bottom:1px solid #fde68a;color:var(--amber);font-size:13px;padding:8px 0}
.notice-bar{background:var(--brand-soft);border-bottom:1px solid #bfdbfe;color:var(--brand-dark);font-size:13px;padding:8px 0}
.flash{margin:16px 0 0;padding:11px 15px;border-radius:var(--radius-sm);font-size:14px;border:1px solid}
.flash-ok{background:var(--green-soft);border-color:#bbf7d0;color:var(--green)}
.flash-warn{background:var(--amber-soft);border-color:#fde68a;color:var(--amber)}
.flash-error{background:var(--red-soft);border-color:#fecaca;color:var(--red)}
.main-content{min-height:60vh;padding-top:32px;padding-bottom:64px}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:9px 16px;border-radius:9px;border:1px solid transparent;font-size:14px;font-weight:600;cursor:pointer;transition:.15s;white-space:nowrap;line-height:1.4}
.btn-sm{padding:6px 12px;font-size:13px}
.btn-lg{padding:12px 22px;font-size:15px}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-dark);color:#fff}
.btn-ghost{background:var(--surface);border-color:var(--line);color:var(--text)}
.btn-ghost:hover{background:var(--surface-2);color:var(--text)}
.btn-soft{background:var(--brand-soft);color:var(--brand)}
.btn-soft:hover{background:#dbeafe;color:var(--brand-dark)}
.btn-danger{background:var(--red-soft);color:var(--red);border-color:#fecaca}
.btn-danger:hover{background:#fee2e2;color:var(--red)}
.btn:disabled{opacity:.55;cursor:not-allowed}
.btn-row{display:flex;gap:9px;flex-wrap:wrap;align-items:center}

/* hero */
.hero{padding:40px 0 34px}
.hero-kicker{display:inline-block;background:var(--brand-soft);color:var(--brand);font-size:12px;font-weight:700;letter-spacing:.06em;padding:5px 11px;border-radius:99px;margin-bottom:16px}
.hero h1{font-size:40px;max-width:820px;margin-bottom:14px}
.hero-lead{font-size:17px;color:var(--muted);max-width:760px;margin-bottom:22px}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap}
.section{padding:30px 0}
.section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;margin-bottom:18px;flex-wrap:wrap}
.section-head h2{font-size:23px;margin:0}
.section-head p{color:var(--muted);margin:5px 0 0;font-size:14px}
.eyebrow{font-size:12px;font-weight:700;letter-spacing:.08em;color:var(--brand);text-transform:uppercase;margin-bottom:7px}

/* cards & grids */
.grid{display:grid;gap:16px}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.card-hover{transition:.18s}
.card-hover:hover{transform:translateY(-2px);border-color:#c7d7f5;box-shadow:0 10px 30px rgba(37,99,235,.09)}
.card h3{margin:0 0 8px;font-size:17px}
.card p{color:var(--muted);font-size:14px;margin:0 0 14px}
.card-tag{display:inline-block;font-size:11px;font-weight:700;color:var(--brand);background:var(--brand-soft);border-radius:6px;padding:3px 8px;margin-bottom:10px}
.card-link{font-size:13px;font-weight:700}
.path-num{font-size:12px;font-weight:800;color:var(--faint);letter-spacing:.05em}
.divider{height:1px;background:var(--line);margin:22px 0}

/* tables */
.table-wrap{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.table-scroll{overflow-x:auto}
table{width:100%;border-collapse:collapse;font-size:14px}
thead th{background:var(--surface-2);text-align:left;font-size:12px;font-weight:700;color:var(--muted);letter-spacing:.03em;padding:11px 14px;white-space:nowrap;border-bottom:1px solid var(--line)}
tbody td{padding:12px 14px;border-bottom:1px solid #eef2f7;vertical-align:middle}
tbody tr:last-child td{border-bottom:0}
tbody tr:hover{background:#fafcff}
td.num,th.num{text-align:right;font-variant-numeric:tabular-nums}
.price{font-weight:800;color:var(--text);font-size:15px;font-variant-numeric:tabular-nums}
.price-low{color:var(--teal)}
.muted{color:var(--muted)}
.faint{color:var(--faint)}
.small{font-size:12.5px}
.mono{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:12.5px}
.nowrap{white-space:nowrap}
.stale{color:var(--amber)}

/* badges */
.badge{display:inline-flex;align-items:center;gap:4px;font-size:11.5px;font-weight:700;padding:3px 9px;border-radius:99px;white-space:nowrap}
.badge-green{background:var(--green-soft);color:var(--green)}
.badge-gray{background:var(--surface-2);color:var(--muted)}
.badge-blue{background:var(--brand-soft);color:var(--brand)}
.badge-amber{background:var(--amber-soft);color:var(--amber)}
.badge-red{background:var(--red-soft);color:var(--red)}
.badge-teal{background:var(--teal-soft);color:var(--teal)}

/* filters & forms */
.toolbar{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-bottom:16px}
.toolbar .grow{flex:1;min-width:190px}
input[type=text],input[type=email],input[type=password],input[type=number],input[type=url],select,textarea{width:100%;padding:9px 12px;border:1px solid var(--line);border-radius:9px;background:var(--surface);color:var(--text);font:inherit;font-size:14px;outline:none;transition:.15s}
input:focus,select:focus,textarea:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(37,99,235,.12)}
textarea{min-height:110px;resize:vertical}
label.field{display:block;margin-bottom:15px}
label.field>span{display:block;font-size:13px;font-weight:700;margin-bottom:6px}
.field-hint{font-size:12px;color:var(--faint);margin-top:5px}
.form-card{max-width:560px}
.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 14px}
.inline-form{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.search-box{position:relative}
.checkbox-row{display:flex;align-items:center;gap:8px;font-size:14px;margin-bottom:10px}
.checkbox-row input{width:16px;height:16px}

/* pills */
.pills{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:18px}
.pill{padding:6px 13px;border-radius:99px;border:1px solid var(--line);background:var(--surface);font-size:13px;font-weight:600;color:var(--muted)}
.pill:hover{color:var(--brand);border-color:#bfdbfe}
.pill.active{background:var(--brand);border-color:var(--brand);color:#fff}

/* detail / prose */
.prose{max-width:780px;font-size:15.5px;line-height:1.85}
.prose h2{font-size:21px;margin:28px 0 12px}
.prose h3{font-size:17px;margin:22px 0 10px}
.prose li{margin-bottom:7px}
.prose p{color:#334155}
.callout{background:var(--brand-soft);border-left:3px solid var(--brand);padding:14px 18px;border-radius:0 var(--radius-sm) var(--radius-sm) 0;margin:18px 0;font-size:14px}
.callout.warn{background:var(--amber-soft);border-color:#d97706;color:#78350f}
.stat-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin-bottom:22px}
.stat{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px}
.stat .num{font-size:26px;font-weight:800;letter-spacing:-.02em}
.stat .label{font-size:12.5px;color:var(--muted);margin-top:3px}
.empty{padding:44px 20px;text-align:center;color:var(--muted);font-size:14px}
.detail-head{display:flex;justify-content:space-between;gap:20px;align-items:flex-start;flex-wrap:wrap;margin-bottom:24px}
.detail-price{font-size:30px;font-weight:800;color:var(--teal);letter-spacing:-.02em}
.kv{display:grid;grid-template-columns:120px 1fr;gap:8px 14px;font-size:14px}
.kv dt{color:var(--muted)}
.kv dd{margin:0}

/* footer */
.site-footer{background:#fff;border-top:1px solid var(--line);margin-top:30px;padding:34px 0 20px}
.footer-inner{display:flex;justify-content:space-between;gap:26px;flex-wrap:wrap}
.footer-brand{font-weight:800;font-size:16px;margin-bottom:7px}
.footer-inner p{color:var(--muted);font-size:13px;max-width:420px;margin:0}
.footer-links{display:flex;gap:18px;flex-wrap:wrap;align-items:flex-start;font-size:13px}
.footer-bottom{border-top:1px solid var(--line);margin-top:26px;padding-top:16px;color:var(--faint);font-size:12.5px}

/* admin */
.admin-body{background:#f5f7fb}
.admin-topbar{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:40}
.admin-topbar-inner{max-width:1500px;margin:0 auto;padding:0 22px;height:58px;display:flex;align-items:center;justify-content:space-between}
.brand-name em{font-style:normal;font-weight:500;color:var(--muted);font-size:13px}
.admin-top-actions{display:flex;align-items:center;gap:10px}
.admin-who{font-size:13px;color:var(--muted)}
.admin-shell{max-width:1500px;margin:0 auto;display:grid;grid-template-columns:210px minmax(0,1fr);gap:22px;padding:22px}
.admin-sidebar{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:10px;height:fit-content;position:sticky;top:80px}
.admin-sidebar nav{display:flex;flex-direction:column;gap:2px}
.admin-sidebar a{padding:9px 12px;border-radius:8px;font-size:13.5px;font-weight:600;color:var(--muted)}
.admin-sidebar a:hover{background:var(--surface-2);color:var(--text)}
.admin-sidebar a.active{background:var(--brand-soft);color:var(--brand)}
.admin-main{min-width:0}
.admin-page-head{display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap;margin-bottom:18px}
.admin-page-head h1{font-size:24px;margin:0}
.admin-page-head p{margin:4px 0 0;color:var(--muted);font-size:13px}
.admin-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px;margin-bottom:18px}
.admin-card h2{font-size:17px;margin:0 0 14px}
.admin-stat-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin-bottom:20px}
.admin-stat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px}
.admin-stat .num{font-size:24px;font-weight:800}
.admin-stat .label{font-size:12.5px;color:var(--muted)}
.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin-bottom:18px;flex-wrap:wrap}
.tabs a{padding:9px 14px;font-size:13.5px;font-weight:600;color:var(--muted);border-bottom:2px solid transparent}
.tabs a.active{color:var(--brand);border-bottom-color:var(--brand)}
.row-actions{display:flex;gap:6px;flex-wrap:wrap}
.row-actions form{margin:0}
.table-compact td,.table-compact th{padding:9px 11px;font-size:13px}
.pagination{display:flex;gap:6px;margin-top:16px;flex-wrap:wrap}
.pagination a,.pagination span{padding:6px 11px;border:1px solid var(--line);border-radius:8px;background:#fff;font-size:13px;color:var(--muted)}
.pagination .current{background:var(--brand);color:#fff;border-color:var(--brand)}

/* misc */
.account-grid{display:grid;grid-template-columns:220px minmax(0,1fr);gap:22px}
.account-menu{display:flex;flex-direction:column;gap:3px}
.account-menu a{padding:9px 12px;border-radius:8px;color:var(--muted);font-size:14px;font-weight:600}
.account-menu a:hover{background:var(--surface-2);color:var(--text)}
.account-menu a.active{background:var(--brand-soft);color:var(--brand)}
.faq-item{border-bottom:1px solid var(--line);padding:16px 0}
.faq-item:last-child{border-bottom:0}
.faq-item h3{font-size:16px;margin:0 0 7px}
.faq-item p{color:var(--muted);margin:0;font-size:14px}
.step-list{counter-reset:step;list-style:none;padding:0}
.step-list li{counter-increment:step;position:relative;padding-left:38px;margin-bottom:13px;font-size:14px}
.step-list li::before{content:counter(step);position:absolute;left:0;top:0;width:26px;height:26px;border-radius:8px;background:var(--brand-soft);color:var(--brand);display:grid;place-items:center;font-weight:800;font-size:12px}
.toast{position:fixed;right:20px;bottom:20px;background:#0f172a;color:#fff;padding:11px 16px;border-radius:10px;font-size:13px;z-index:99;opacity:0;transform:translateY(8px);transition:.2s;pointer-events:none}
.toast.show{opacity:1;transform:none}

@media(max-width:1000px){
  .grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .stat-grid,.admin-stat-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .admin-shell{grid-template-columns:1fr;padding:14px}
  .admin-sidebar{position:static;flex-direction:row;overflow-x:auto}
  .admin-sidebar nav{flex-direction:row}
  .admin-sidebar a{white-space:nowrap}
}
@media(max-width:680px){
  .wrap{padding:0 16px}
  .header-inner{height:auto;padding:11px 0;flex-wrap:wrap;gap:10px}
  .main-nav{order:3;width:100%;overflow-x:auto;flex-wrap:nowrap}
  .header-actions{margin-left:auto}
  .hero{padding:24px 0}
  .hero h1{font-size:29px}
  .hero-lead{font-size:15px}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .stat-grid,.admin-stat-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .form-grid{grid-template-columns:1fr}
  .account-grid{grid-template-columns:1fr}
  .account-menu{flex-direction:row;overflow-x:auto}
  .account-menu a{white-space:nowrap}
  h1{font-size:27px}
}