:root {
    --primary: #0D9488;
    --primary-dark: #0F766E;
    --primary-light: #CCFBF1;
    --sidebar-bg: #0F172A;
    --sidebar-hover: #1E293B;
    --sidebar-text: #94A3B8;
    --bg: #F1F5F9;
    --surface: #FFFFFF;
    --text: #0F172A;
    --muted: #64748B;
    --border: #E2E8F0;
    --danger: #EF4444;
    --ok: #10B981;
    --radius: 12px;
    --shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
}

.admin-layout { display: flex; min-height: 100vh; }
.sidebar {
    width: 232px;
    background: var(--sidebar-bg);
    color: #fff;
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    height: 100vh;
}
.sidebar-header {
    display: flex;
    gap: 12px;
    align-items: center;
    padding: 22px 18px 18px;
}
.brand-mark {
    width: 40px; height: 40px; border-radius: 12px;
    background: linear-gradient(135deg, #14B8A6, #0D9488);
    display: grid; place-items: center; font-weight: 700;
}
.brand-mark.large { width: 56px; height: 56px; font-size: 22px; margin: 0 auto 12px; }
.sidebar-header h3 { font-size: 16px; }
.sidebar-header p { color: var(--sidebar-text); font-size: 12px; margin-top: 2px; }
.sidebar-nav { padding: 8px; flex: 1; }
.sidebar-nav a {
    display: flex; align-items: center; gap: 10px;
    color: var(--sidebar-text); text-decoration: none;
    padding: 11px 12px; border-radius: 10px; margin-bottom: 4px;
}
.sidebar-nav a:hover, .sidebar-nav a.active {
    background: var(--sidebar-hover); color: #fff;
}
.sidebar-nav a.active { background: var(--primary); }
.sidebar-footer { padding: 16px; border-top: 1px solid #1E293B; }
.user-info { color: #CBD5E1; font-size: 13px; margin-bottom: 10px; }
.logout-btn {
    width: 100%; border: 0; background: #1E293B; color: #E2E8F0;
    padding: 8px; border-radius: 8px; cursor: pointer;
}

.main-content { flex: 1; min-width: 0; }
.top-header {
    height: 60px; background: #fff; border-bottom: 1px solid var(--border);
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 28px;
}
.header-title { font-size: 18px; font-weight: 650; }
.header-meta { color: var(--muted); font-size: 13px; display: flex; gap: 16px; }
.header-link { color: var(--primary); text-decoration: none; }
.page-body { padding: 22px 28px 40px; }

.panel {
    background: #fff; border: 1px solid var(--border);
    border-radius: var(--radius); box-shadow: var(--shadow); margin-bottom: 18px; padding: 18px;
}
.panel-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; }
.panel-head a { color: var(--primary); text-decoration: none; font-size: 13px; }

.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-bottom: 18px; }
.stat-grid.mini { grid-template-columns: repeat(3, 1fr); margin: 14px 0 0; }
.stat-card {
    background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
    padding: 18px; box-shadow: var(--shadow);
}
.stat-label { color: var(--muted); font-size: 13px; }
.stat-value { font-size: 32px; font-weight: 700; margin-top: 6px; color: var(--primary-dark); }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-bottom: 18px; }
.chart-box { position: relative; height: 180px; }
.chart-box canvas { width: 100% !important; height: 100% !important; }

.toolbar { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; align-items: center; }
.toolbar.wrap { row-gap: 8px; }
.search, input, select, textarea {
    border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px;
    font: inherit; background: #fff;
}
.search { min-width: 240px; }
.sep { color: var(--muted); }
.btn-primary, .btn-ghost {
    border: 0; border-radius: 8px; padding: 8px 14px; cursor: pointer; font: inherit;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { background: #F1F5F9; color: var(--text); }
.full { width: 100%; }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--border); font-size: 14px; }
th { color: var(--muted); font-weight: 600; background: #F8FAFC; }
.ellipsis { max-width: 280px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.empty { text-align: center; color: var(--muted); padding: 28px !important; }
.actions button {
    border: 0; background: transparent; color: var(--primary); cursor: pointer; margin-right: 8px;
}
.actions .danger { color: var(--danger); }
.tag {
    display: inline-block; background: var(--primary-light); color: var(--primary-dark);
    border-radius: 999px; padding: 2px 8px; font-size: 12px;
}
.badge { border-radius: 999px; padding: 2px 8px; font-size: 12px; }
.badge.ok { background: #D1FAE5; color: #047857; }
.badge.off { background: #FEE2E2; color: #B91C1C; }
.hint { color: var(--muted); font-size: 12px; margin-top: 12px; }

.modal-overlay {
    display: none; position: fixed; inset: 0; background: rgba(15,23,42,.45);
    align-items: center; justify-content: center; z-index: 50;
}
.modal-overlay.show { display: flex; }
.modal { width: min(560px, 92vw); background: #fff; border-radius: 14px; overflow: hidden; }
.modal-header, .modal-footer { padding: 14px 18px; display: flex; justify-content: space-between; align-items: center; }
.modal-header { border-bottom: 1px solid var(--border); }
.modal-footer { border-top: 1px solid var(--border); justify-content: flex-end; gap: 8px; }
.modal-body { padding: 18px; max-height: 70vh; overflow: auto; }
.modal-close { border: 0; background: none; font-size: 22px; cursor: pointer; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.form-grid label, .form-grid .full { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: var(--muted); }
.form-grid .full { grid-column: 1 / -1; }
.detail { display: grid; grid-template-columns: 90px 1fr; gap: 8px 12px; }
.detail dt { color: var(--muted); }
.toast {
    position: fixed; top: 20px; left: 50%; transform: translateX(-50%) translateY(-20px);
    background: #0F172A; color: #fff; padding: 10px 16px; border-radius: 8px;
    opacity: 0; pointer-events: none; transition: .2s;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

.login-page {
    min-height: 100vh; display: grid; place-items: center;
    background: linear-gradient(135deg, #042F2E, #0F172A 50%, #0D9488);
}
.login-box {
    width: 400px; background: #fff; border-radius: 16px; padding: 36px 32px;
    box-shadow: 0 20px 50px rgba(0,0,0,.25);
}
.login-brand { text-align: center; margin-bottom: 24px; }
.login-brand p, .login-tip, .form-hint { color: var(--muted); font-size: 13px; }
.login-box label { display: block; margin: 12px 0 6px; font-size: 13px; }
.login-box input { width: 100%; }
.login-tip { text-align: center; margin-top: 16px; }
.form-hint { min-height: 20px; color: var(--danger); margin: 8px 0; }

@media (max-width: 960px) {
    .stat-grid, .grid-2 { grid-template-columns: 1fr; }
    .sidebar { display: none; }
}