/* 后台管理样式 */
:root{
  --primary:#1552f0;
  --primary-dark:#0d3bb0;
  --danger:#dc2626;
  --success:#16a34a;
  --warning:#d97706;
  --ink:#17233d;
  --muted:#5b6b8c;
  --line:#e6eaf3;
  --bg:#f5f7fb;
  --radius:10px;
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:"PingFang SC","Microsoft YaHei",Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.6;font-size:14px}
a{color:var(--primary);text-decoration:none}
a:hover{color:var(--primary-dark)}

/* 登录 */
.admin-login-body{background:linear-gradient(135deg,#0f172a,#1e3a8a);min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}
.login-box{background:#fff;border-radius:var(--radius);box-shadow:0 20px 60px rgba(0,0,0,.2);width:100%;max-width:420px;padding:40px}
.login-box h2{font-size:22px;margin-bottom:24px;text-align:center}
.login-box .row{margin-bottom:16px}
.login-box label{display:block;font-size:13px;color:#33415e;margin-bottom:6px;font-weight:600}
.login-box input{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:8px;font-size:14px;outline:none}
.login-box input:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(21,82,240,.12)}
.login-box .btn{width:100%;padding:12px;border:none;border-radius:8px;background:var(--primary);color:#fff;font-size:15px;cursor:pointer}
.login-box .btn:hover{background:var(--primary-dark)}
.login-box .alert{padding:10px 12px;border-radius:6px;font-size:13px;margin-bottom:14px}
.login-box .alert-err{background:#fff0f0;color:#b02a2a;border:1px solid #ffd0d0}

/* 布局 */
.admin-wrap{display:flex;min-height:100vh}
.admin-sidebar{width:220px;background:#0f172a;color:#94a3b8;position:fixed;height:100vh;overflow-y:auto}
.admin-sidebar h2{padding:20px;font-size:16px;color:#fff;border-bottom:1px solid #1e293b}
.admin-sidebar h2 a{color:#fff}
.admin-sidebar nav a{display:block;padding:14px 20px;font-size:14px;border-left:3px solid transparent;transition:.2s}
.admin-sidebar nav a:hover{color:#fff;background:#1e293b}
.admin-sidebar nav a.active{color:#fff;background:#1e293b;border-left-color:var(--primary)}
.admin-main{flex:1;margin-left:220px}
.admin-header{background:#fff;padding:14px 28px;display:flex;justify-content:space-between;align-items:center;box-shadow:0 1px 0 var(--line);position:sticky;top:0;z-index:50}
.admin-header .user{color:#33415e;font-size:14px}
.admin-header .user a{margin-left:14px;color:var(--muted);font-size:13px}
.admin-header .user a:hover{color:var(--primary)}
.admin-body{padding:28px}

/* 卡片 */
.card{background:#fff;border-radius:var(--radius);box-shadow:0 1px 3px rgba(0,0,0,.04);padding:24px;margin-bottom:24px}
.card h3{font-size:18px;margin-bottom:18px;padding-bottom:12px;border-bottom:1px solid var(--line)}

/* 表格 */
.data-table{width:100%;border-collapse:collapse;font-size:13px}
.data-table th,.data-table td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--line)}
.data-table th{background:#f8fafc;color:#5b6b8c;font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.5px}
.data-table tr:hover{background:#f8fafc}
.data-table img{max-height:40px;border-radius:4px}
.badge{display:inline-block;padding:2px 10px;border-radius:20px;font-size:12px}
.badge-green{background:#dcfce7;color:#166534}
.badge-gray{background:#f1f5f9;color:#475569}

/* 表单 */
.form-row{margin-bottom:18px}
.form-row label{display:block;font-size:13px;color:#33415e;margin-bottom:6px;font-weight:600}
.form-row input[type="text"],.form-row input[type="password"],.form-row input[type="number"],.form-row input[type="url"],.form-row select,.form-row textarea{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:8px;font-size:14px;outline:none;font-family:inherit}
.form-row input:focus,.form-row select:focus,.form-row textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(21,82,240,.12)}
.form-row textarea{min-height:120px;resize:vertical}
.form-row .hint{color:#8a95a8;font-size:12px;margin-top:4px}
.form-actions{display:flex;gap:10px;align-items:center}
.btn-sm{padding:8px 18px;font-size:13px;border-radius:6px;border:none;cursor:pointer;transition:.2s}
.btn-primary-sm{background:var(--primary);color:#fff}
.btn-primary-sm:hover{background:var(--primary-dark)}
.btn-danger-sm{background:var(--danger);color:#fff}
.btn-danger-sm:hover{background:#b91c1c}
.btn-secondary-sm{background:#f1f5f9;color:#33415e;border:1px solid var(--line)}
.btn-secondary-sm:hover{background:#e2e8f0}

/* 统计 */
.stats-row{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-bottom:24px}
.stat-card{background:#fff;border-radius:var(--radius);padding:22px;box-shadow:0 1px 3px rgba(0,0,0,.04)}
.stat-card h4{font-size:13px;color:var(--muted);margin-bottom:8px}
.stat-card .num{font-size:28px;font-weight:700;color:var(--primary)}

/* 筛选栏 */
.filter-bar{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:18px;align-items:center}
.filter-bar select,.filter-bar input{padding:8px 12px;border:1px solid var(--line);border-radius:6px;font-size:13px}

/* 响应式 */
@media (max-width: 768px) {
  .admin-sidebar{width:100%;position:relative;height:auto}
  .admin-main{margin-left:0}
  .admin-wrap{flex-direction:column}
  .stats-row{grid-template-columns:repeat(2,1fr)}
}