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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB',
        'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #333;
    min-height: 100vh;
}

.page {
    display: none;
}

.page.active {
    display: block;
}

/* 登录页面 */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-box {
    background: white;
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    width: 100%;
    max-width: 420px;
}

.login-box h1 {
    text-align: center;
    color: #667eea;
    margin-bottom: 8px;
    font-size: 32px;
}

.subtitle {
    text-align: center;
    color: #999;
    margin-bottom: 32px;
    font-size: 14px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e1e8ed;
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.required {
    color: #e74c3c;
}

/* 按钮 */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
}

.btn-danger {
    background: #e74c3c;
    color: white;
}

.btn-danger:hover {
    background: #c0392b;
}

.btn-success {
    background: #27ae60;
    color: white;
}

.btn-success:hover {
    background: #229954;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 13px;
}

.btn-block {
    width: 100%;
    justify-content: center;
}

.text-center {
    text-align: center;
}

.mt-3 {
    margin-top: 16px;
}

.mt-4 {
    margin-top: 24px;
}

.login-box a {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
}

.login-box a:hover {
    text-decoration: underline;
}

/* 主页面 */
.navbar {
    background: white;
    padding: 16px 32px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand h2 {
    color: #667eea;
    font-size: 24px;
}

.navbar-user {
    display: flex;
    align-items: center;
    gap: 16px;
}

.navbar-user span {
    font-weight: 500;
    color: #555;
}

.main-container {
    display: flex;
    height: calc(100vh - 72px);
}

/* 侧边栏 */
.sidebar {
    width: 240px;
    background: white;
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.05);
}

.nav-menu {
    list-style: none;
    padding: 16px 0;
}

.nav-item {
    padding: 16px 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    transition: all 0.3s;
    color: #555;
}

.nav-item:hover {
    background: #f8f9fa;
    color: #667eea;
}

.nav-item.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-left: 4px solid #764ba2;
}

.nav-icon {
    font-size: 20px;
}

/* 内容区域 */
.content {
    flex: 1;
    padding: 32px;
    overflow-y: auto;
    background: #f8f9fa;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.tab-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.tab-header h3 {
    color: #333;
    font-size: 24px;
}

/* 统计卡片 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

.stat-card {
    background: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    display: flex;
    align-items: center;
    gap: 20px;
    transition: transform 0.3s;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.stat-icon {
    font-size: 48px;
    opacity: 0.8;
}

.stat-info h4 {
    color: #999;
    font-size: 14px;
    font-weight: 400;
    margin-bottom: 8px;
}

.stat-value {
    font-size: 32px;
    font-weight: 700;
    color: #667eea;
}

/* 表格 */
.table-container {
    background: white;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    overflow: hidden;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table thead {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.table th,
.table td {
    padding: 16px;
    text-align: left;
}

.table th {
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.table tbody tr {
    border-bottom: 1px solid #e1e8ed;
    transition: background 0.2s;
}

.table tbody tr:hover {
    background: #f8f9fa;
}

.table tbody tr:last-child {
    border-bottom: none;
}

.table td {
    font-size: 14px;
    color: #555;
}

.table .actions {
    display: flex;
    gap: 8px;
}

.badge {
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.badge-success {
    background: #d4edda;
    color: #155724;
}

.badge-warning {
    background: #fff3cd;
    color: #856404;
}

.badge-danger {
    background: #f8d7da;
    color: #721c24;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: #e1e8ed;
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    transition: width 0.3s;
}

/* 筛选框 */
.filter-box {
    background: white;
    padding: 16px;
    border-radius: 8px;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.filter-box label {
    font-weight: 500;
    color: #555;
}

.filter-box select {
    padding: 8px 16px;
    border: 2px solid #e1e8ed;
    border-radius: 8px;
    font-size: 14px;
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    padding: 24px 32px;
    border-bottom: 1px solid #e1e8ed;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    color: #333;
    font-size: 20px;
}

.close {
    font-size: 32px;
    color: #999;
    cursor: pointer;
    transition: color 0.3s;
    line-height: 1;
}

.close:hover {
    color: #333;
}

.modal-body {
    padding: 32px;
}

.modal-footer {
    padding: 24px 32px;
    border-top: 1px solid #e1e8ed;
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* 计算预览 */
.calculation-preview {
    margin-top: 24px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.calculation-preview h4 {
    color: #333;
    margin-bottom: 12px;
    font-size: 16px;
}

.calculation-preview p {
    margin-bottom: 8px;
    font-size: 14px;
}

.calculation-preview .highlight {
    color: #667eea;
    font-weight: 700;
    font-size: 18px;
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #999;
}

.empty-state-icon {
    font-size: 64px;
    margin-bottom: 16px;
}

.empty-state-text {
    font-size: 16px;
}

/* 响应式 */
@media (max-width: 768px) {
    .main-container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        position: fixed;
        bottom: 0;
        left: 0;
        z-index: 900;
        box-shadow: 0 -2px 8px rgba(0,0,0,0.06);
    }

    .nav-menu {
        display: flex;
        padding: 0;
    }

    .nav-item {
        flex: 1;
        justify-content: center;
        padding: 12px 8px;
    }

    .content {
        padding: 16px;
        padding-bottom: 90px; /* 预留底部导航高度 */
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

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

    .table-container {
        overflow-x: auto;
    }

    .modal-content {
        width: 95%;
    }
}

/* 动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tab-content.active {
    animation: fadeIn 0.3s ease-out;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #555;
}