/* 统一公共样式 */
:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --primary-light: #eef2ff;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --shadow-md: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
    --radius: 12px;
    --radius-sm: 8px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif; background: var(--gray-50); color: var(--gray-800); line-height: 1.6; }

/* 卡片 */
.card {
    background: #fff;
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-100);
    transition: box-shadow 0.3s ease;
}
.card:hover { box-shadow: var(--shadow-md); }

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
    text-decoration: none;
    gap: 6px;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: var(--shadow); }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: #059669; transform: translateY(-1px); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #dc2626; transform: translateY(-1px); }
.btn-warning { background: var(--warning); color: #fff; }
.btn-warning:hover { background: #d97706; }
.btn-outline { background: transparent; color: var(--gray-600); border: 1px solid var(--gray-300); }
.btn-outline:hover { background: var(--gray-50); border-color: var(--gray-400); }
.btn-sm { padding: 6px 12px; font-size: 12px; }
.btn-lg { padding: 14px 28px; font-size: 16px; }

/* 输入框 */
input[type="text"], input[type="password"], input[type="email"], input[type="number"], textarea, select {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-family: inherit;
    background: #fff;
    color: var(--gray-800);
    transition: border-color 0.2s, box-shadow 0.2s;
}
input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}
input::placeholder, textarea::placeholder { color: var(--gray-400); }
input:disabled, textarea:disabled { background: var(--gray-50); color: var(--gray-400); cursor: not-allowed; }

/* 表格 */
.table { width: 100%; border-collapse: separate; border-spacing: 0; }
.table th {
    background: var(--gray-50);
    padding: 14px 16px;
    text-align: left;
    font-weight: 600;
    font-size: 13px;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid var(--gray-100);
}
.table td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--gray-100);
    font-size: 14px;
    vertical-align: middle;
}
.table tr:last-child td { border-bottom: none; }
.table tr:hover td { background: var(--gray-50); }

/* 徽章/状态标签 */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}
.badge-primary { background: var(--primary-light); color: var(--primary); }
.badge-success { background: #d1fae5; color: #065f46; }
.badge-danger { background: #fee2e2; color: #991b1b; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-gray { background: var(--gray-100); color: var(--gray-600); }

/* 顶部栏 */
.topbar {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: #fff;
    padding: 0 28px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: var(--shadow);
}
.topbar h1 { font-size: 18px; font-weight: 600; }
.topbar a { color: rgba(255,255,255,0.9); text-decoration: none; transition: color 0.2s; }
.topbar a:hover { color: #fff; }

/* 侧边栏 */
.sidebar { width: 240px; background: #fff; border-right: 1px solid var(--gray-100); min-height: calc(100vh - 64px); }
.sidebar-menu { list-style: none; padding: 12px; }
.sidebar-menu li a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    color: var(--gray-600);
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
}
.sidebar-menu li a:hover { background: var(--gray-50); color: var(--primary); }
.sidebar-menu li a.active { background: var(--primary-light); color: var(--primary); }

/* 消息提示 */
.msg { padding: 14px 18px; border-radius: var(--radius-sm); font-size: 14px; margin-bottom: 20px; border-left: 4px solid; }
.msg.success { background: #d1fae5; color: #065f46; border-left-color: var(--success); }
.msg.error { background: #fee2e2; color: #991b1b; border-left-color: var(--danger); }
.msg.warning { background: #fef3c7; color: #92400e; border-left-color: var(--warning); }
.msg.info { background: var(--primary-light); color: var(--primary); border-left-color: var(--primary); }

/* 分页区 */
.pagination { display: flex; gap: 8px; align-items: center; justify-content: center; margin-top: 24px; }
.pagination button {
    padding: 8px 14px;
    border: 1px solid var(--gray-200);
    background: #fff;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s;
    font-size: 14px;
}
.pagination button:hover { border-color: var(--primary); color: var(--primary); }
.pagination button.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* 空状态 */
.empty { text-align: center; padding: 60px 20px; color: var(--gray-400); }
.empty-icon { font-size: 48px; margin-bottom: 16px; opacity: 0.5; }
.empty h3 { font-size: 18px; margin-bottom: 8px; color: var(--gray-500); }
.empty p { font-size: 14px; }

/* 加载动画 */
.loading { text-align: center; padding: 40px; color: var(--gray-400); }
.loading::after {
    content: '';
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-left: 10px;
    vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}
.modal.show { display: flex; }
.modal-content {
    background: #fff;
    border-radius: var(--radius);
    padding: 28px;
    width: 480px;
    max-width: 90%;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.3s ease;
}
@keyframes slideUp { from { opacity: 0; transform: translateY(20px); } }
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.modal-header h3 { font-size: 18px; font-weight: 600; }
.modal-close { font-size: 24px; cursor: pointer; color: var(--gray-400); transition: color 0.2s; }
.modal-close:hover { color: var(--gray-600); }
.modal-footer { margin-top: 24px; display: flex; gap: 10px; justify-content: flex-end; }

/* 表单组 */
.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 8px; font-size: 14px; font-weight: 500; color: var(--gray-700); }
.form-group .hint { font-size: 12px; color: var(--gray-400); margin-top: 6px; }
.form-group-row { display: flex; gap: 16px; }
.form-group-row .form-group { flex: 1; }

/* 页面标题区 */
.page-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; flex-wrap: wrap; gap: 16px; }
.page-header h2 { font-size: 22px; font-weight: 700; color: var(--gray-800); }
.page-header h2::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 24px;
    background: var(--primary);
    border-radius: 2px;
    margin-right: 12px;
    vertical-align: middle;
}

/* 标签栏 */
.tabs { display: flex; gap: 4px; border-bottom: 2px solid var(--gray-100); margin-bottom: 24px; }
.tabs button {
    padding: 12px 20px;
    border: none;
    background: transparent;
    color: var(--gray-500);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all 0.2s;
}
.tabs button:hover { color: var(--primary); }
.tabs button.active { color: var(--primary); border-bottom-color: var(--primary); }

/* 主内容区 */
.content { flex: 1; padding: 28px; max-width: 1200px; }

/* 统计卡片 */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 20px; margin-bottom: 28px; }
.stat-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-100);
}
.stat-card .stat-num { font-size: 32px; font-weight: 700; color: var(--primary); }
.stat-card .stat-label { font-size: 13px; color: var(--gray-500); margin-top: 4px; }
.stat-card.success .stat-num { color: var(--success); }
.stat-card.danger .stat-num { color: var(--danger); }
.stat-card.warning .stat-num { color: var(--warning); }