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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: #f5f5f5;
    overflow: hidden;
}

.page {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.page.active {
    display: block;
}

/* 登录页面 */
#login-page {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

#login-page.active {
    display: flex !important;
    justify-content: center;
    align-items: center;
}

.login-container {
    background: white;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 400px;
}

.login-container h1 {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
}

.login-container input {
    width: 100%;
    padding: 12px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 14px;
}

.login-container button {
    width: 100%;
    padding: 12px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
}

.login-container button:hover {
    background: #5568d3;
}

/* 主界面布局 */
#main-page {
    background: #f5f5f5;
}

#main-page.active {
    display: flex !important;
    height: 100vh;
}

.sidebar {
    width: 250px;
    background: #2c3e50;
    color: white;
    padding: 20px;
}

.sidebar h2 {
    margin-bottom: 30px;
    font-size: 20px;
}

.nav-item {
    display: block;
    padding: 12px 15px;
    color: #ecf0f1;
    text-decoration: none;
    border-radius: 5px;
    margin-bottom: 5px;
    transition: background 0.3s;
}

.nav-item:hover {
    background: #34495e;
}

.nav-item.active {
    background: #3498db;
}

.nav-item.logout {
    margin-top: 20px;
    background: #e74c3c;
}

.content {
    flex: 1;
    padding: 30px;
    overflow-y: auto;
}

/* 卡片样式 */
.card {
    background: white;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.card h3 {
    margin-bottom: 15px;
    color: #333;
    font-size: 18px;
    border-bottom: 2px solid #667eea;
    padding-bottom: 10px;
}

.card p {
    margin: 10px 0;
    color: #666;
    font-size: 14px;
}

/* 仪表板统计卡片 */
#dashboard-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.stat-number {
    font-size: 24px;
    font-weight: bold;
    color: #667eea;
    margin: 5px 0;
}

/* 表格样式 */
table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

table th, table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #eee;
}

table th {
    background: #f8f9fa;
    font-weight: 600;
}

/* 按钮样式 */
.btn {
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
}

.btn-primary {
    background: #3498db;
    color: white;
}

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

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

.btn-sm {
    padding: 6px 12px;
    font-size: 13px;
}

.btn:hover {
    opacity: 0.9;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 统计卡片 */
.stat-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    text-align: center;
    transition: transform 0.2s;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-value {
    font-size: 32px;
    font-weight: bold;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 14px;
    opacity: 0.9;
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.6);
}

.modal-content {
    background-color: #fefefe;
    margin: 5% auto;
    padding: 30px;
    border: 1px solid #888;
    border-radius: 12px;
    width: 90%;
    max-width: 600px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
    position: relative;
    max-height: 80vh;
    overflow-y: auto;
}

.close {
    color: #aaa;
    float: right;
    font-size: 32px;
    font-weight: bold;
    line-height: 20px;
    cursor: pointer;
}

.close:hover,
.close:focus {
    color: #000;
}

/* 详情区块 */
.detail-section {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.detail-section h4 {
    margin-bottom: 12px;
    color: #667eea;
    font-size: 16px;
}

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

.detail-table td {
    padding: 8px;
    border-bottom: 1px solid #e0e0e0;
}

.detail-table td:first-child {
    width: 120px;
    color: #666;
    font-weight: 500;
}

.detail-table td:last-child {
    color: #333;
}

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