:root{--bg:#f4f6fb;--card:#fff;--text:#1f2937;--muted:#6b7280;--line:#e5e7eb;--primary:#2563eb;--primary-2:#1d4ed8;--ok:#16a34a;--warn:#d97706;--danger:#dc2626;--soft:#eef2ff;--radius:14px;--shadow:0 1px 2px rgba(0,0,0,.04),0 4px 16px rgba(15,23,42,.06)}
@media (prefers-color-scheme:dark){:root{--bg:#0b1020;--card:#141a2e;--text:#e5e7eb;--muted:#9ca3af;--line:#252d45;--primary:#3b82f6;--primary-2:#60a5fa;--soft:#1b2440;--shadow:0 1px 2px rgba(0,0,0,.3)}}
*{box-sizing:border-box}html,body{margin:0}body{background:var(--bg);color:var(--text);font:15px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}
a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}
.container{max-width:1100px;margin:0 auto;padding:0 16px}
.nav{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}
.nav .container{display:flex;align-items:center;gap:6px;height:58px;overflow-x:auto}
.brand{font-weight:700;font-size:17px;color:var(--text);margin-right:14px;white-space:nowrap;display:flex;align-items:center;gap:8px}
.brand .logo{width:28px;height:28px;border-radius:8px;background:linear-gradient(135deg,#2563eb,#7c3aed);display:grid;place-items:center;color:#fff;font-size:13px}
.nav a.item{color:var(--muted);padding:6px 10px;border-radius:8px;white-space:nowrap}.nav a.item:hover,.nav a.item.active{background:var(--soft);color:var(--primary);text-decoration:none}
.nav .spacer{flex:1}
main{padding:24px 0 60px}
h1{font-size:22px;margin:0 0 4px}h2{font-size:17px;margin:0 0 12px}.sub{color:var(--muted);margin:0 0 20px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px}
.grid{display:grid;gap:14px}.grid.cols{grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}
.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.between{justify-content:space-between}
.btn{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:var(--card);color:var(--text);padding:8px 14px;border-radius:10px;cursor:pointer;font:inherit;font-size:14px;white-space:nowrap}
.btn:hover{border-color:var(--primary);color:var(--primary);text-decoration:none}
.btn.primary{background:var(--primary);border-color:var(--primary);color:#fff}.btn.primary:hover{background:var(--primary-2);color:#fff}
.btn.danger{color:var(--danger)}.btn.danger:hover{border-color:var(--danger)}.btn.sm{padding:4px 10px;font-size:13px}.btn.block{width:100%;justify-content:center;padding:11px}
.btn:disabled{opacity:.5;cursor:not-allowed}
label{display:block;font-size:13px;color:var(--muted);margin:0 0 6px}
input[type=text],input[type=email],input[type=password],input[type=number],input[type=url],select,textarea{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:var(--bg);color:var(--text);font:inherit}
input:focus,select:focus,textarea:focus{outline:2px solid color-mix(in srgb,var(--primary) 35%,transparent);border-color:var(--primary)}
textarea{min-height:110px;font-family:ui-monospace,Menlo,monospace;font-size:13px}
.field{margin-bottom:14px}.fields{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px}
.check{display:flex;gap:8px;align-items:center;color:var(--text);font-size:14px;margin:0}
.alert{padding:10px 14px;border-radius:10px;margin-bottom:16px;font-size:14px}.alert.ok{background:color-mix(in srgb,var(--ok) 12%,transparent);color:var(--ok)}.alert.err{background:color-mix(in srgb,var(--danger) 12%,transparent);color:var(--danger)}.alert.info{background:var(--soft);color:var(--primary)}
.err-text{color:var(--danger);font-size:13px;margin-top:4px}
.muted{color:var(--muted)}.small{font-size:13px}.mono{font-family:ui-monospace,Menlo,monospace;word-break:break-all}
.badge{display:inline-block;font-size:12px;padding:1px 8px;border-radius:99px;background:var(--soft);color:var(--primary)}.badge.red{background:color-mix(in srgb,var(--danger) 14%,transparent);color:var(--danger)}.badge.green{background:color-mix(in srgb,var(--ok) 14%,transparent);color:var(--ok)}.badge.gray{background:var(--line);color:var(--muted)}
/* auth */
.auth{min-height:100vh;display:grid;place-items:center;padding:24px 16px}.auth .card{width:100%;max-width:420px;padding:28px}
.auth .head{text-align:center;margin-bottom:20px}.auth .head .logo{width:48px;height:48px;border-radius:14px;margin:0 auto 10px;font-size:20px}
.tabs{display:flex;gap:4px;background:var(--bg);padding:4px;border-radius:12px;margin-bottom:18px;overflow-x:auto}
.tabs button{flex:1;border:0;background:transparent;padding:8px 10px;border-radius:9px;cursor:pointer;color:var(--muted);font:inherit;font-size:14px;white-space:nowrap}.tabs button.active{background:var(--card);color:var(--primary);box-shadow:var(--shadow)}
.pane{display:none}.pane.active{display:block}
.divider{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:13px;margin:18px 0}.divider:before,.divider:after{content:"";flex:1;height:1px;background:var(--line)}
/* otp cards */
.otp{position:relative;cursor:pointer;transition:transform .08s,border-color .15s;padding:16px 18px}.otp:hover{border-color:var(--primary)}.otp:active{transform:scale(.99)}
.otp .svc{font-weight:600;display:flex;align-items:center;gap:10px}.otp .acct{color:var(--muted);font-size:13px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.avatar{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;color:#fff;font-weight:700;flex-shrink:0}
.otp .code{font:600 30px/1.2 ui-monospace,Menlo,monospace;letter-spacing:3px;margin:12px 0 6px;color:var(--primary)}
.otp .code.warn{color:var(--warn)}
.otp .meta{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:var(--muted)}
.bar{height:3px;background:var(--line);border-radius:3px;overflow:hidden;margin-top:10px}.bar i{display:block;height:100%;background:var(--primary);transition:width 1s linear}.bar i.warn{background:var(--warn)}
.otp .menu{position:absolute;top:12px;right:12px;display:flex;gap:4px;opacity:.0;transition:opacity .15s}.otp:hover .menu{opacity:1}
@media (hover:none){.otp .menu{opacity:1}}
.icon-btn{border:0;background:var(--bg);color:var(--muted);width:28px;height:28px;border-radius:8px;cursor:pointer;display:grid;place-items:center;font-size:14px}.icon-btn:hover{color:var(--primary)}
.toast{position:fixed;left:50%;bottom:28px;transform:translateX(-50%) translateY(20px);background:#111827;color:#fff;padding:10px 18px;border-radius:10px;opacity:0;transition:.2s;pointer-events:none;z-index:99}.toast.show{opacity:1;transform:translateX(-50%)}
.empty{text-align:center;padding:60px 20px;color:var(--muted)}.empty .big{font-size:44px}
/* scanner */
.scan-box{border:2px dashed var(--line);border-radius:var(--radius);padding:26px;text-align:center;color:var(--muted)}.scan-box.drag{border-color:var(--primary);background:var(--soft)}
.countdown{font-size:56px;font-weight:700;color:var(--primary);line-height:1}
video,canvas.preview{max-width:100%;border-radius:12px;background:#000}
.qr{background:#fff;padding:10px;border-radius:12px;display:inline-block;line-height:0}.qr svg{width:220px;height:220px}
table{width:100%;border-collapse:collapse;font-size:14px}th,td{text-align:left;padding:10px 8px;border-bottom:1px solid var(--line);vertical-align:middle}th{color:var(--muted);font-weight:500;font-size:13px}
.table-wrap{overflow-x:auto}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-bottom:18px}.stat .n{font-size:26px;font-weight:700}.stat .l{color:var(--muted);font-size:13px}
.pagination{display:flex;gap:6px;flex-wrap:wrap;margin-top:14px}
nav[role=navigation] svg{width:16px;height:16px}
@media (max-width:640px){.otp .code{font-size:26px}h1{font-size:20px}}
.pagination ul,ul.pagination{list-style:none;padding:0;margin:0;display:flex;gap:6px}.pagination li a,.pagination li span{display:inline-block;padding:6px 12px;border:1px solid var(--line);border-radius:8px}
/* ===== Xboard 风格登录页 ===== */
.xb-auth{--xb:#316C72;--xb-hover:#3d8289;--xb-press:#2B4C59;min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px 16px;background:#f2f3f5 center/cover no-repeat fixed}
.xb-card{width:100%;max-width:420px;background:#fff;color:#333639;border-radius:3px;box-shadow:0 1px 2px -2px rgba(0,0,0,.08),0 3px 6px 0 rgba(0,0,0,.06),0 5px 12px 4px rgba(0,0,0,.04);padding:40px 32px 28px}
.xb-card h1{font-size:30px;font-weight:500;text-align:center;margin:0 0 6px;color:#1f2225}
.xb-card .desc{text-align:center;color:#76787b;font-size:14px;margin:0 0 28px}
.xb-card .xb-input{position:relative;margin-bottom:18px}
.xb-card .xb-input input{width:100%;height:40px;padding:0 12px;border:1px solid #e0e0e6;border-radius:3px;background:#fff;color:#333639;font:inherit;font-size:14px;transition:border-color .2s,box-shadow .2s}
.xb-card .xb-input input:hover{border-color:var(--xb-hover)}
.xb-card .xb-input input:focus{outline:0;border-color:var(--xb-hover);box-shadow:0 0 0 2px rgba(49,108,114,.2)}
.xb-card .xb-btn{width:100%;height:40px;border:0;border-radius:3px;background:var(--xb);color:#fff;font:inherit;font-size:15px;cursor:pointer;transition:background .2s}
.xb-card .xb-btn:hover{background:var(--xb-hover)}.xb-card .xb-btn:active{background:var(--xb-press)}
.xb-card .xb-btn.ghost{background:#fff;color:#333639;border:1px solid #e0e0e6;display:flex;align-items:center;justify-content:center;gap:8px;text-decoration:none}
.xb-card .xb-btn.ghost:hover{border-color:var(--xb-hover);color:var(--xb)}
.xb-card .xb-links{display:flex;justify-content:space-between;margin-top:16px;font-size:14px}
.xb-card .xb-links a{color:var(--xb)}
.xb-card .xb-row{display:flex;justify-content:space-between;align-items:center;margin:-4px 0 18px;font-size:14px;color:#606266}
.xb-card .xb-row label{display:flex;align-items:center;gap:6px;margin:0;color:#606266;font-size:14px}
.xb-card .xb-err{background:#fdecee;color:#d03050;border-radius:3px;padding:8px 12px;font-size:13px;margin-bottom:18px}
.xb-card .xb-divider{display:flex;align-items:center;gap:10px;color:#a3a5a8;font-size:12px;margin:20px 0 14px}.xb-card .xb-divider:before,.xb-card .xb-divider:after{content:"";flex:1;height:1px;background:#efeff5}
.xb-card .xb-foot{text-align:center;color:#a3a5a8;font-size:12px;margin-top:20px}
@media (max-width:480px){.xb-card{padding:32px 20px 24px}.xb-card h1{font-size:26px}}
/* ===== 后台：左侧菜单栏 ===== */
.adm{display:flex;min-height:100vh}
.adm-side{width:220px;flex-shrink:0;background:var(--card);border-right:1px solid var(--line);position:sticky;top:0;height:100vh;display:flex;flex-direction:column}
.adm-side .brand{height:60px;padding:0 20px;margin:0;border-bottom:1px solid var(--line)}
.adm-menu{padding:12px 10px;flex:1;overflow-y:auto}
.adm-menu .grp{font-size:12px;color:var(--muted);padding:14px 12px 6px}
.adm-menu a{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:8px;color:var(--text);font-size:14px;margin-bottom:2px}
.adm-menu a:hover{background:var(--soft);text-decoration:none}
.adm-menu a.active{background:#316C72;color:#fff}
.adm-menu a .ic{width:18px;text-align:center}
.adm-side .foot{padding:12px 10px;border-top:1px solid var(--line)}
.adm-main{flex:1;min-width:0;display:flex;flex-direction:column}
.adm-top{height:60px;background:var(--card);border-bottom:1px solid var(--line);display:flex;align-items:center;gap:12px;padding:0 24px;position:sticky;top:0;z-index:5}
.adm-top .title{font-weight:600;font-size:16px}
.adm-body{padding:24px}
.adm-toggle{display:none;border:0;background:transparent;font-size:20px;cursor:pointer;color:var(--text)}
.adm-mask{display:none}
@media (max-width:860px){
  .adm-side{position:fixed;left:0;top:0;z-index:30;transform:translateX(-100%);transition:transform .2s}
  .adm.open .adm-side{transform:none}
  .adm.open .adm-mask{display:block;position:fixed;inset:0;background:rgba(0,0,0,.35);z-index:20}
  .adm-toggle{display:block}.adm-body{padding:16px}.adm-top{padding:0 16px}
}