:root { --blue:#3f5bd8; --dark:#1e2c5d; --line:#d9dce5; --bg:#f3f5f9; }
* { box-sizing:border-box; }
body { margin:0; font-family:Arial,"Microsoft YaHei",sans-serif; color:#20232b; background:var(--bg); }
a { text-decoration:none; color:inherit; }
input, textarea, select, button { font:inherit; }
.admin-topbar { height:64px; padding:0 24px; display:flex; justify-content:space-between; align-items:center; background:#fff; border-bottom:1px solid var(--line); position:sticky; top:0; z-index:10; }
.admin-brand { font-weight:700; color:var(--blue); font-size:20px; }
.admin-topbar div { display:flex; gap:18px; align-items:center; font-size:14px; }
.admin-topbar a:hover { color:var(--blue); }
.admin-shell { display:grid; grid-template-columns:220px minmax(0,1fr); min-height:calc(100vh - 64px); }
.admin-sidebar { background:var(--dark); padding:20px 12px; }
.admin-sidebar a { display:block; color:#dce3ff; padding:12px 15px; margin-bottom:5px; border-radius:4px; }
.admin-sidebar a:hover, .admin-sidebar a.is-active { background:var(--blue); color:#fff; }
.admin-main { padding:28px; min-width:0; }
.admin-main h1 { margin:0 0 20px; font-size:28px; }
.admin-card { background:#fff; border:1px solid var(--line); border-radius:6px; padding:20px; margin-bottom:20px; box-shadow:0 3px 14px rgba(25,35,70,.04); }
.admin-card h2 { margin-top:0; }
.stats { display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); gap:16px; }
.stat { background:#fff; border:1px solid var(--line); padding:20px; border-radius:6px; }
.stat strong { display:block; font-size:30px; color:var(--blue); }
.stat span { color:#697080; }
.toolbar { display:flex; justify-content:space-between; align-items:center; gap:12px; margin-bottom:16px; flex-wrap:wrap; }
.btn { display:inline-flex; align-items:center; justify-content:center; padding:9px 15px; border-radius:4px; border:1px solid var(--blue); background:var(--blue); color:#fff; cursor:pointer; }
.btn.secondary { background:#fff; color:var(--blue); }
.btn.danger { background:#b93636; border-color:#b93636; }
.btn.small { padding:6px 10px; font-size:13px; }
.table-wrap { overflow:auto; }
table { width:100%; border-collapse:collapse; min-width:720px; background:#fff; }
th, td { padding:11px 12px; border-bottom:1px solid #eceef3; text-align:left; vertical-align:middle; }
th { background:#f8f9fc; font-size:14px; color:#4d5463; }
td img { width:48px; height:60px; object-fit:contain; }
.form-grid { display:grid; grid-template-columns:1fr 1fr; gap:18px; }
.form-group { margin-bottom:16px; }
.form-group.full { grid-column:1/-1; }
label { display:block; font-weight:600; margin-bottom:7px; }
.form-control { width:100%; border:1px solid #cfd3dc; padding:10px 11px; border-radius:4px; background:#fff; }
textarea.form-control { min-height:180px; resize:vertical; }
.help { color:#7a8190; font-size:13px; margin-top:5px; }
.alert { padding:12px 15px; margin-bottom:18px; border-radius:4px; }
.alert.success { background:#e9f7ed; border:1px solid #bee2c6; color:#236c31; }
.alert.error { background:#fff0f0; border:1px solid #edc0c0; color:#9c2929; }
.status { display:inline-block; padding:3px 8px; border-radius:999px; font-size:12px; background:#ebf7ee; color:#277039; }
.status.off { background:#f3f3f3; color:#757575; }
.login-page { min-height:100vh; display:grid; place-items:center; background:linear-gradient(145deg,#eef1ff,#f8f8fb); padding:20px; }
.login-box { width:min(420px,100%); background:#fff; border:1px solid var(--line); border-radius:9px; padding:30px; box-shadow:0 18px 50px rgba(35,51,113,.12); }
.login-box h1 { margin:0 0 8px; color:var(--blue); }
.login-box p { color:#747b89; }
.login-box .btn { width:100%; margin-top:8px; }
.db-warning { background:#fff8e6; border:1px solid #efd28a; color:#7d5a05; padding:12px 14px; border-radius:4px; margin-bottom:18px; }
@media(max-width:900px){ .admin-shell{grid-template-columns:1fr;} .admin-sidebar{display:flex; overflow:auto; padding:8px;} .admin-sidebar a{white-space:nowrap; margin:0 4px;} .stats{grid-template-columns:repeat(2,1fr);} .admin-main{padding:18px;} }
@media(max-width:600px){ .admin-topbar{padding:0 12px;} .admin-topbar span{display:none;} .stats{grid-template-columns:1fr;} .form-grid{grid-template-columns:1fr;} }