/* ===== 基础 ===== */
* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --danger: #dc2626;
    --bg: #f4f6f9;
    --card-bg: #ffffff;
    --text: #1f2937;
    --text-muted: #6b7280;
    --border: #e5e7eb;
    --radius: 8px;
}
body {
    font-family: -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

/* ===== 认证页面 ===== */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);
    padding: 20px;
}
.auth-card {
    background: var(--card-bg);
    width: 100%;
    max-width: 380px;
    padding: 36px 32px;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0,0,0,.25);
}
.auth-card h1 {
    font-size: 24px;
    margin-bottom: 6px;
}
.subtitle { color: var(--text-muted); margin-bottom: 24px; font-size: 14px; }
.auth-footer {
    margin-top: 18px;
    text-align: center;
    font-size: 14px;
    color: var(--text-muted);
}
.auth-footer a { color: var(--primary); margin-left: 6px; }
.hint {
    margin-top: 14px;
    padding: 8px;
    text-align: center;
    font-size: 12px;
    color: var(--text-muted);
    background: #f9fafb;
    border-radius: 6px;
}

/* ===== 表单 ===== */
.form-group { margin-bottom: 16px; }
.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 14px;
    font-weight: 500;
}
.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 14px;
    transition: border-color .15s, box-shadow .15s;
    font-family: inherit;
}
.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,.15);
}

/* ===== 按钮 ===== */
.btn {
    display: inline-block;
    padding: 9px 16px;
    border: 1px solid transparent;
    border-radius: var(--radius);
    font-size: 14px;
    cursor: pointer;
    text-decoration: none;
    transition: background .15s, opacity .15s;
    font-family: inherit;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #b91c1c; }
.btn-outline { background: transparent; color: var(--text); border-color: var(--border); }
.btn-outline:hover { background: #f3f4f6; }
.btn-block { display: block; width: 100%; }
.btn-sm { padding: 5px 10px; font-size: 12px; }

/* ===== 提示 ===== */
.alert {
    padding: 10px 14px;
    border-radius: var(--radius);
    margin-bottom: 16px;
    font-size: 14px;
}
.alert-success { background: #d1fae5; color: #065f46; }
.alert-error   { background: #fee2e2; color: #991b1b; }
.alert-info    { background: #dbeafe; color: #1e40af; }

/* ===== 顶栏 ===== */
.topbar {
    height: 56px;
    background: #1e293b;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
}
.topbar-brand { font-weight: 600; font-size: 16px; }
.topbar-user { display: flex; align-items: center; gap: 12px; font-size: 14px; }
.topbar-user .btn { color: #fff; border-color: #475569; }

/* ===== 布局 ===== */
.layout {
    display: flex;
    min-height: calc(100vh - 56px);
}
.sidebar {
    width: 200px;
    background: #fff;
    border-right: 1px solid var(--border);
    padding: 16px 0;
    flex-shrink: 0;
}
.nav-item {
    display: block;
    padding: 10px 20px;
    color: var(--text);
    text-decoration: none;
    font-size: 14px;
    border-left: 3px solid transparent;
}
.nav-item:hover { background: #f9fafb; }
.nav-item.active {
    color: var(--primary);
    border-left-color: var(--primary);
    background: #eff6ff;
}
.content {
    flex: 1;
    padding: 24px;
    overflow-x: auto;
}

/* ===== 卡片 / 表格 ===== */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px 24px;
    margin-bottom: 20px;
    box-shadow: 0 1px 3px rgba(0,0,0,.06);
}
.card h2 {
    font-size: 16px;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.badge {
    background: #eff6ff;
    color: var(--primary);
    font-size: 12px;
    padding: 2px 8px;
    border-radius: 12px;
    font-weight: normal;
}
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}
.data-table th,
.data-table td {
    padding: 10px 12px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}
.data-table th {
    background: #f9fafb;
    font-weight: 600;
    color: var(--text-muted);
    font-size: 13px;
}
.data-table tbody tr:hover { background: #f9fafb; }
.empty {
    padding: 32px;
    text-align: center;
    color: var(--text-muted);
    font-size: 14px;
}
.export-actions {
    margin-left: auto;
    display: inline-flex;
    gap: 8px;
}