:root {
    --primary: #1A73E8;
    --primary-dark: #1558b0;
    --accent: #FF7A2F;
    --bg: #f5f6f8;
    --sidebar-bg: #1f2a3d;
    --sidebar-fg: #c4ccd8;
    --sidebar-active: #1A73E8;
    --card: #ffffff;
    --border: #e6e8ec;
    --text: #2b2f38;
    --muted: #8a93a3;
    --success: #2e9e5b;
    --danger: #e04b4b;
    --warning: #e6a23c;
    --radius: 10px;
    --shadow: 0 1px 3px rgba(20,30,50,.08);
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
    font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 14px;
}
a { text-decoration: none; color: inherit; }

/* layout */
.layout { display: flex; min-height: 100vh; }
.sidebar {
    width: 210px; background: var(--sidebar-bg); color: var(--sidebar-fg);
    flex-shrink: 0; display: flex; flex-direction: column;
}
.brand { display: flex; align-items: center; gap: 8px; padding: 18px 16px; font-size: 18px; font-weight: 700; color: #fff; }
.brand-logo { font-size: 22px; }
.menu { padding: 8px; flex: 1; }
.menu-item {
    display: flex; align-items: center; gap: 10px; padding: 11px 14px; border-radius: 8px;
    color: var(--sidebar-fg); margin-bottom: 4px; transition: background .15s, color .15s;
}
.menu-item:hover { background: rgba(255,255,255,.06); color: #fff; }
.menu-item.active { background: var(--sidebar-active); color: #fff; font-weight: 600; }
.menu-icon { width: 20px; text-align: center; }

.main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.topbar {
    height: 58px; background: #fff; border-bottom: 1px solid var(--border);
    display: flex; align-items: center; justify-content: space-between; padding: 0 22px;
    position: sticky; top: 0; z-index: 10;
}
.topbar-title { font-size: 16px; font-weight: 600; }
.topbar-right { display: flex; align-items: center; gap: 14px; }
.admin-name { color: var(--muted); }
.content { padding: 20px 22px; }

/* cards */
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 16px 18px; margin-bottom: 18px; }
.card-title { font-size: 15px; font-weight: 600; margin: 0 0 14px; display: flex; align-items: center; justify-content: space-between; }

/* stats */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.stat {
    background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 18px;
    box-shadow: var(--shadow);
}
.stat .label { color: var(--muted); font-size: 13px; }
.stat .value { font-size: 26px; font-weight: 700; margin-top: 6px; color: var(--text); }
.stat.accent .value { color: var(--accent); }
.stat.primary .value { color: var(--primary); }
.stat-row { display: flex; gap: 14px; flex-wrap: wrap; }
.stat-row .stat { flex: 1; min-width: 140px; }

/* tables */
.table { width: 100%; border-collapse: collapse; background: #fff; }
.table th, .table td { padding: 11px 12px; text-align: left; border-bottom: 1px solid var(--border); font-size: 13px; }
.table th { background: #fafbfc; color: var(--muted); font-weight: 600; white-space: nowrap; }
.table tr:hover td { background: #f9fbff; }
.table img.thumb { width: 46px; height: 46px; object-fit: cover; border-radius: 6px; }
.mono { font-family: Consolas, Menlo, monospace; font-size: 12px; color: var(--muted); }

/* badges */
.badge { display: inline-block; padding: 2px 9px; border-radius: 20px; font-size: 12px; font-weight: 600; }
.b-success { background: #e7f6ec; color: var(--success); }
.b-primary { background: #e7f0fd; color: var(--primary); }
.b-warning { background: #fdf3e3; color: var(--warning); }
.b-danger  { background: #fdeaea; color: var(--danger); }
.b-muted   { background: #eef0f3; color: var(--muted); }

/* buttons */
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 7px 14px; border-radius: 8px; border: 1px solid var(--border); background: #fff; color: var(--text); cursor: pointer; font-size: 13px; transition: all .15s; }
.btn:hover { border-color: var(--primary); color: var(--primary); }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); color: #fff; }
.btn-danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn-danger:hover { opacity: .9; color: #fff; }
.btn-ghost { background: transparent; border-color: transparent; color: var(--muted); }
.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* forms */
.toolbar { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-bottom: 14px; }
.input, .select, textarea, input[type=text], input[type=number], input[type=password], input[type=date], input[type=datetime-local] {
    padding: 8px 11px; border: 1px solid var(--border); border-radius: 8px; font-size: 13px; background: #fff; color: var(--text); outline: none;
}
.input:focus, .select:focus, textarea:focus { border-color: var(--primary); }
label.fld { display: block; margin-bottom: 14px; }
label.fld > span { display: block; margin-bottom: 6px; color: var(--muted); font-size: 13px; }

/* modal */
.modal-mask { position: fixed; inset: 0; background: rgba(20,30,50,.45); display: none; align-items: flex-start; justify-content: center; z-index: 100; padding: 40px 16px; overflow: auto; }
.modal-mask.show { display: flex; }
.modal { background: #fff; border-radius: 12px; width: 100%; max-width: 560px; box-shadow: 0 12px 40px rgba(0,0,0,.2); }
.modal-header { padding: 16px 20px; border-bottom: 1px solid var(--border); font-weight: 600; display: flex; justify-content: space-between; align-items: center; }
.modal-body { padding: 20px; max-height: 70vh; overflow: auto; }
.modal-footer { padding: 14px 20px; border-top: 1px solid var(--border); display: flex; justify-content: flex-end; gap: 10px; }
.modal-close { cursor: pointer; color: var(--muted); font-size: 20px; line-height: 1; }

/* pagination & misc */
.pager { display: flex; gap: 8px; align-items: center; justify-content: flex-end; margin-top: 14px; }
.empty { text-align: center; color: var(--muted); padding: 40px 0; }
.row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.chart-box { width: 100%; height: 240px; }
.flex { display: flex; }
.between { justify-content: space-between; }
.gap { gap: 10px; }
.muted { color: var(--muted); }
.mt { margin-top: 14px; }
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 16px; flex-wrap: wrap; }
.tab { padding: 9px 16px; cursor: pointer; border-bottom: 2px solid transparent; color: var(--muted); }
.tab.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 600; }
.toast { position: fixed; top: 20px; left: 50%; transform: translateX(-50%); background: #2b2f38; color: #fff; padding: 10px 18px; border-radius: 8px; z-index: 999; font-size: 13px; opacity: 0; transition: opacity .2s; pointer-events: none; }
.toast.show { opacity: 1; }
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }
@media (max-width: 900px) { .stats-grid { grid-template-columns: repeat(2,1fr); } .row-2 { grid-template-columns: 1fr; } }