:root {
    --bg: #0f1419;
    --bg-soft: #161b22;
    --panel: #1c2330;
    --panel-2: #222b3a;
    --line: rgba(255,255,255,.08);
    --text: #e8eef7;
    --muted: #8b9bb4;
    --accent: #3dd6c6;
    --accent-2: #4ea1ff;
    --danger: #ff6b7a;
    --warning: #ffb020;
    --ok: #3ecf8e;
    --shadow: 0 16px 40px rgba(0,0,0,.35);
    --radius: 16px;
    --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
    font-family: var(--font);
    background:
        radial-gradient(1200px 600px at 10% -10%, rgba(61,214,198,.18), transparent 55%),
        radial-gradient(900px 500px at 100% 0%, rgba(78,161,255,.16), transparent 50%),
        var(--bg);
    color: var(--text);
    min-height: 100vh;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

.layout { display: flex; min-height: 100vh; }
.sidebar {
    width: 250px;
    background: rgba(22,27,34,.92);
    border-right: 1px solid var(--line);
    padding: 22px 16px;
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    height: 100vh;
}
.brand { display: flex; gap: 12px; align-items: center; padding: 8px 10px 22px; }
.brand-icon {
    width: 44px; height: 44px; border-radius: 14px;
    display: grid; place-items: center;
    background: linear-gradient(135deg, rgba(61,214,198,.25), rgba(78,161,255,.25));
    border: 1px solid var(--line);
    font-size: 22px;
}
.brand-title { font-weight: 700; letter-spacing: .3px; }
.brand-sub { color: var(--muted); font-size: 12px; margin-top: 2px; }

.nav { display: flex; flex-direction: column; gap: 6px; flex: 1; }
.nav-item {
    color: var(--text);
    padding: 11px 14px;
    border-radius: 12px;
    text-decoration: none;
    transition: .2s ease;
}
.nav-item:hover { background: rgba(255,255,255,.04); text-decoration: none; }
.nav-item.active {
    background: linear-gradient(135deg, rgba(61,214,198,.18), rgba(78,161,255,.14));
    border: 1px solid rgba(61,214,198,.25);
}

.sidebar-footer { border-top: 1px solid var(--line); padding-top: 14px; }
.admin-chip { color: var(--muted); font-size: 13px; margin-bottom: 10px; padding: 0 6px; }
.logout-btn {
    display: block; text-align: center; padding: 10px;
    border-radius: 12px; background: rgba(255,107,122,.12);
    color: #ff8e9a; text-decoration: none; border: 1px solid rgba(255,107,122,.2);
}
.logout-btn:hover { background: rgba(255,107,122,.2); text-decoration: none; }

.main { flex: 1; padding: 24px 28px 40px; min-width: 0; }
.topbar {
    display: flex; justify-content: space-between; align-items: end;
    margin-bottom: 18px; gap: 12px; flex-wrap: wrap;
}
.topbar h1 { margin: 0; font-size: 26px; font-weight: 700; }
.topbar-meta { color: var(--muted); font-size: 13px; }

.content { display: flex; flex-direction: column; gap: 18px; }

.alert {
    padding: 12px 16px; border-radius: 12px; border: 1px solid var(--line);
    background: var(--panel);
}
.alert-success { border-color: rgba(62,207,142,.35); background: rgba(62,207,142,.12); }
.alert-error { border-color: rgba(255,107,122,.35); background: rgba(255,107,122,.12); }
.alert-info { border-color: rgba(78,161,255,.35); background: rgba(78,161,255,.12); }

.card {
    background: linear-gradient(180deg, rgba(28,35,48,.96), rgba(22,27,34,.96));
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
}
.card-title {
    margin: 0 0 14px; font-size: 16px; font-weight: 700;
    display: flex; align-items: center; gap: 8px;
}

.grid-stats {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
}
.stat {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 16px;
}
.stat-label { color: var(--muted); font-size: 13px; }
.stat-value { font-size: 28px; font-weight: 700; margin-top: 8px; }
.stat-icon { font-size: 20px; margin-bottom: 6px; }

.form-grid { display: grid; gap: 14px; max-width: 560px; }
.form-row { display: flex; flex-direction: column; gap: 8px; }
label { color: var(--muted); font-size: 13px; }
input[type="text"], input[type="password"], input[type="number"], select, textarea {
    width: 100%;
    background: var(--bg-soft);
    border: 1px solid var(--line);
    color: var(--text);
    border-radius: 12px;
    padding: 12px 14px;
    outline: none;
    font: inherit;
}
input:focus, select:focus, textarea:focus {
    border-color: rgba(61,214,198,.55);
    box-shadow: 0 0 0 3px rgba(61,214,198,.12);
}

.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 6px;
    border: none; border-radius: 12px; padding: 11px 16px;
    font: inherit; cursor: pointer; text-decoration: none;
    transition: .15s ease;
}
.btn:hover { filter: brightness(1.08); text-decoration: none; }
.btn-primary {
    background: linear-gradient(135deg, #2fbfb0, #3b8cff);
    color: #fff; font-weight: 600;
}
.btn-secondary {
    background: rgba(255,255,255,.06);
    color: var(--text);
    border: 1px solid var(--line);
}
.btn-danger {
    background: rgba(255,107,122,.16);
    color: #ff8e9a;
    border: 1px solid rgba(255,107,122,.28);
}
.btn-sm { padding: 7px 12px; border-radius: 10px; font-size: 13px; }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; }

.table-wrap { overflow-x: auto; }
table.data {
    width: 100%; border-collapse: collapse; min-width: 720px;
}
table.data th, table.data td {
    text-align: left; padding: 12px 10px;
    border-bottom: 1px solid var(--line);
    vertical-align: middle;
    font-size: 14px;
}
table.data th { color: var(--muted); font-weight: 600; font-size: 12px; letter-spacing: .4px; }
table.data tr:hover td { background: rgba(255,255,255,.02); }

.badge {
    display: inline-flex; align-items: center; gap: 4px;
    padding: 4px 10px; border-radius: 999px; font-size: 12px;
    border: 1px solid var(--line);
}
.badge-ok { background: rgba(62,207,142,.14); color: #69e0ab; border-color: rgba(62,207,142,.28); }
.badge-off { background: rgba(255,107,122,.12); color: #ff8e9a; border-color: rgba(255,107,122,.25); }
.badge-info { background: rgba(78,161,255,.12); color: #8cbcff; border-color: rgba(78,161,255,.25); }
.badge-warn { background: rgba(255,176,32,.12); color: #ffc45c; border-color: rgba(255,176,32,.25); }

.muted { color: var(--muted); }
.mono { font-family: Consolas, Monaco, monospace; font-size: 13px; word-break: break-all; }
.help { color: var(--muted); font-size: 13px; line-height: 1.6; }

/* Login */
.login-page {
    min-height: 100vh; display: grid; place-items: center; padding: 24px;
}
.login-card {
    width: min(420px, 100%);
    background: linear-gradient(180deg, rgba(28,35,48,.98), rgba(18,22,30,.98));
    border: 1px solid var(--line);
    border-radius: 20px;
    box-shadow: var(--shadow);
    padding: 28px;
}
.login-card h1 { margin: 0 0 6px; font-size: 24px; }
.login-card .sub { color: var(--muted); margin-bottom: 22px; }
.captcha-row { display: flex; gap: 10px; align-items: center; }
.captcha-row img {
    height: 46px; border-radius: 10px; cursor: pointer;
    border: 1px solid var(--line);
}
.login-card .btn { width: 100%; margin-top: 6px; }

.empty {
    text-align: center; padding: 36px 16px; color: var(--muted);
}

@media (max-width: 1100px) {
    .grid-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 860px) {
    .layout { flex-direction: column; }
    .sidebar {
        width: 100%; height: auto; position: relative;
        border-right: none; border-bottom: 1px solid var(--line);
    }
    .nav { flex-direction: row; flex-wrap: wrap; }
    .sidebar-footer { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
}