:root {
    --primary: #1890ff;
    --success: #52c41a;
    --danger: #ff4d4f;
    --warning: #faad14;
    --bg: #f0f2f5;
    --card-bg: #fff;
    --text: #333;
    --text-secondary: #666;
    --border: #d9d9d9;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 14px;
}

.container { max-width: 1400px; margin: 0 auto; padding: 20px; }

/* Navbar */
.navbar {
    background: var(--card-bg);
    display: flex;
    align-items: center;
    padding: 0 20px;
    height: 56px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}
.navbar-brand { font-size: 18px; font-weight: bold; margin-right: 40px; }
.navbar-menu { display: flex; gap: 8px; flex: 1; }
.nav-link {
    text-decoration: none;
    color: var(--text);
    padding: 8px 16px;
    border-radius: 4px;
    transition: background 0.2s;
}
.nav-link:hover { background: var(--bg); }
.navbar-user { display: flex; align-items: center; gap: 12px; }

/* Buttons */
.btn {
    display: inline-block;
    padding: 6px 16px;
    border: 1px solid var(--border);
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    font-size: 14px;
    background: var(--card-bg);
    color: var(--text);
    transition: all 0.2s;
}
.btn:hover { border-color: var(--primary); color: var(--primary); }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { opacity: 0.85; color: #fff; }
.btn-success { background: var(--success); color: #fff; border-color: var(--success); }
.btn-success:hover { opacity: 0.85; color: #fff; }
.btn-danger { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn-danger:hover { opacity: 0.85; color: #fff; }
.btn-warning { background: var(--warning); color: #fff; border-color: var(--warning); }
.btn-warning:hover { opacity: 0.85; color: #fff; }
.btn-sm { padding: 4px 10px; font-size: 12px; }

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}
.card-title { font-size: 16px; font-weight: bold; margin-bottom: 16px; }

/* Tables */
.table-wrapper { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 10px 12px; text-align: left; border-bottom: 1px solid #f0f0f0; white-space: nowrap; }
th { background: #fafafa; font-weight: 600; font-size: 13px; color: var(--text-secondary); }
tr:hover { background: #fafafa; }

/* Forms */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-weight: 500; color: var(--text-secondary); }
.form-control {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 14px;
    transition: border-color 0.2s;
}
.form-control:focus { border-color: var(--primary); outline: none; box-shadow: 0 0 0 2px rgba(24,144,255,0.2); }
select.form-control { appearance: auto; }

.form-row { display: flex; gap: 16px; flex-wrap: wrap; }
.form-row .form-group { flex: 1; min-width: 200px; }

.form-inline { display: flex; gap: 12px; align-items: flex-end; flex-wrap: wrap; margin-bottom: 16px; }
.form-inline .form-group { margin-bottom: 0; }
.form-inline .form-group label { font-size: 12px; }
.form-inline .form-control { width: auto; min-width: 150px; }

/* Alerts */
.alert {
    padding: 12px 16px;
    border-radius: 4px;
    margin-bottom: 16px;
}
.alert-success { background: #f6ffed; border: 1px solid #b7eb8f; color: #389e0d; }
.alert-danger { background: #fff2f0; border: 1px solid #ffccc7; color: #cf1322; }
.alert-warning { background: #fffbe6; border: 1px solid #ffe58f; color: #d48806; }
.alert-info { background: #e6f7ff; border: 1px solid #91d5ff; color: #096dd9; }

/* Status badges */
.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 12px;
    font-weight: 500;
}
.badge-success { background: #f6ffed; color: #389e0d; border: 1px solid #b7eb8f; }
.badge-warning { background: #fffbe6; color: #d48806; border: 1px solid #ffe58f; }
.badge-danger { background: #fff2f0; color: #cf1322; border: 1px solid #ffccc7; }
.badge-info { background: #e6f7ff; color: #096dd9; border: 1px solid #91d5ff; }
.badge-default { background: #fafafa; color: #666; border: 1px solid #d9d9d9; }

/* Dropdown */
.dropdown { position: relative; display: inline-block; }
.dropdown-btn { cursor: pointer; }
.dropdown-content {
    display: none;
    position: absolute;
    right: 0;
    background: var(--card-bg);
    min-width: 160px;
    box-shadow: 0 3px 12px rgba(0,0,0,0.15);
    border-radius: 4px;
    z-index: 10;
    overflow: hidden;
}
.dropdown-content.show { display: block; }
.dropdown-item {
    display: block;
    padding: 8px 16px;
    text-decoration: none;
    color: var(--text);
    font-size: 13px;
    cursor: pointer;
    border: none;
    background: none;
    width: 100%;
    text-align: left;
}
.dropdown-item:hover { background: #f5f5f5; }
.dropdown-divider { height: 1px; background: #f0f0f0; margin: 4px 0; }

/* Pagination */
.pagination { display: flex; justify-content: center; gap: 4px; margin-top: 20px; }
.pagination a, .pagination span {
    padding: 6px 12px;
    border: 1px solid var(--border);
    border-radius: 4px;
    text-decoration: none;
    color: var(--text);
}
.pagination .active { background: var(--primary); color: #fff; border-color: var(--primary); }
.pagination a:hover { border-color: var(--primary); color: var(--primary); }

/* Stats cards */
.stats-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin-bottom: 20px; }
.stat-card { background: var(--card-bg); border-radius: 8px; padding: 20px; text-align: center; box-shadow: 0 1px 3px rgba(0,0,0,0.08); }
.stat-card .stat-value { font-size: 28px; font-weight: bold; color: var(--primary); }
.stat-card .stat-label { color: var(--text-secondary); margin-top: 4px; }

/* Modal */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}
.modal-overlay.show { display: flex; }
.modal {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 24px;
    min-width: 400px;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}
.modal-title { font-size: 16px; font-weight: bold; margin-bottom: 16px; }
.modal-footer { display: flex; justify-content: flex-end; gap: 8px; margin-top: 20px; }

/* Section */
.section-title {
    font-size: 16px;
    font-weight: 600;
    margin: 24px 0 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid #f0f0f0;
}

/* Login page */
.login-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}
.login-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 40px;
    width: 400px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}
.login-title { text-align: center; font-size: 24px; font-weight: bold; margin-bottom: 32px; }

/* Checkbox */
.checkbox-label { display: flex; align-items: center; gap: 6px; cursor: pointer; }
.checkbox-label input { width: auto; }

/* Utility */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-2 { margin-top: 8px; }
.mt-4 { margin-top: 16px; }
.mb-2 { margin-bottom: 8px; }
.mb-4 { margin-bottom: 16px; }
.flex { display: flex; }
.gap-2 { gap: 8px; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }

/* ===== 导航栏角标 ===== */
.nav-badge {
    background: #ff4d4f;
    color: #fff;
    border-radius: 10px;
    padding: 1px 6px;
    font-size: 11px;
    margin-left: 4px;
    vertical-align: top;
}

/* ===== 移动端汉堡菜单按钮 ===== */
.navbar-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 22px;
    cursor: pointer;
    padding: 4px 8px;
    color: var(--text);
    margin-left: auto;
}

/* ===== 响应式适配 ===== */
@media (max-width: 768px) {
    .navbar {
        flex-wrap: wrap;
        height: auto;
        padding: 8px 16px;
        gap: 8px;
    }
    .navbar-toggle { display: block; }
    .navbar-menu {
        display: none;
        flex-direction: column;
        width: 100%;
        gap: 0;
        border-top: 1px solid #f0f0f0;
        padding-top: 8px;
    }
    .navbar-menu.open { display: flex; }
    .nav-link { padding: 10px 8px; border-bottom: 1px solid #f5f5f5; }
    .navbar-user { margin-left: auto; }

    .container { padding: 10px; }

    .card { padding: 12px; }

    .stats-row { grid-template-columns: repeat(2, 1fr); }

    .form-row { flex-direction: column; }
    .form-row .form-group { min-width: 100%; }

    th, td { padding: 8px; font-size: 13px; }

    .btn { padding: 8px 14px; min-height: 36px; }

    .login-card { width: 95%; padding: 24px; }

    .modal-overlay { align-items: flex-start; }
    .modal { min-width: 95vw; margin: 8px; }

    .charts-row { grid-template-columns: 1fr; }

    .action-buttons { flex-wrap: wrap; }
    .dropdown-menu { right: auto; left: 0; }
    .dropdown-submenu-content { left: 0; top: 100%; }
}

@media (max-width: 480px) {
    .stats-row { grid-template-columns: 1fr; }
    .stat-card .stat-value { font-size: 22px; }
}