/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Microsoft Yahei', sans-serif;
}

body {
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* 深蓝色主题色 */
:root {
    --primary: #0f4c81;
    --primary-light: #1a6aa2;
    --primary-dark: #0a3a61;
    --secondary: #e8f4f8;
    --text-dark: #2c3e50;
    --text-light: #7f8c8d;
    --white: #ffffff;
    --gray: #f2f2f2;
    --danger: #e74c3c;
    --success: #27ae60;
}

/* 头部样式 */
.header {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    color: var(--white);
    padding: 20px 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header .logo {
    font-size: 24px;
    font-weight: bold;
    text-decoration: none;
    color: var(--white);
}

.header .nav {
    float: right;
    margin-top: 5px;
}

.header .nav a {
    color: var(--white);
    text-decoration: none;
    margin-left: 30px;
    font-size: 16px;
    transition: all 0.3s ease;
}

.header .nav a:hover {
    color: var(--secondary);
    text-shadow: 0 0 5px rgba(255,255,255,0.5);
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 10px 20px;
    background-color: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    text-decoration: none;
    font-size: 16px;
    transition: all 0.3s ease;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.btn:hover {
    background-color: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.btn-secondary {
    background-color: var(--secondary);
    color: var(--primary);
}

.btn-secondary:hover {
    background-color: #d4e6f1;
}

.btn-danger {
    background-color: var(--danger);
}

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

.btn-success {
    background-color: var(--success);
}

.btn-success:hover {
    background-color: #219653;
}

/* 卡片样式 */
.card {
    background: var(--white);
    border-radius: 10px;
    box-shadow: 0 3px 15px rgba(0,0,0,0.05);
    padding: 20px;
    margin-bottom: 20px;
    transition: all 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
}

.card-header {
    border-bottom: 1px solid var(--gray);
    padding-bottom: 15px;
    margin-bottom: 15px;
    font-size: 18px;
    font-weight: bold;
    color: var(--primary);
}

/* 表单样式 */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-dark);
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
    transition: border 0.3s ease;
}

.form-control:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(15,76,129,0.1);
}

/* 登录/注册表单 */
.auth-form {
    max-width: 400px;
    margin: 50px auto;
    padding: 30px;
}

/* 表格样式 */
.table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
}

.table th, .table td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid var(--gray);
}

.table th {
    background-color: var(--primary);
    color: var(--white);
    font-weight: 600;
}

.table tr:hover {
    background-color: var(--secondary);
}

/* 分页样式 */
.pagination {
    text-align: center;
    margin: 20px 0;
}

.pagination a {
    display: inline-block;
    padding: 8px 15px;
    margin: 0 5px;
    background-color: var(--white);
    border: 1px solid var(--primary);
    color: var(--primary);
    border-radius: 5px;
    text-decoration: none;
    transition: all 0.3s ease;
}

.pagination a.active {
    background-color: var(--primary);
    color: var(--white);
}

.pagination a:hover:not(.active) {
    background-color: var(--secondary);
}

/* 首页样式 */
.hero {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: var(--white);
    padding: 80px 0;
    text-align: center;
    margin-bottom: 50px;
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

.hero p {
    font-size: 20px;
    max-width: 800px;
    margin: 0 auto 30px;
}

.features {
    padding: 50px 0;
}

.feature-card {
    text-align: center;
    padding: 30px;
    margin-bottom: 30px;
}

.feature-card i {
    font-size: 48px;
    color: var(--primary);
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: var(--text-dark);
}

/* 用户中心样式 */
.user-center {
    padding: 30px 0;
}

.user-sidebar {
    width: 250px;
    float: left;
}

.user-menu {
    list-style: none;
}

.user-menu li {
    margin-bottom: 10px;
}

.user-menu a {
    display: block;
    padding: 15px;
    background-color: var(--white);
    color: var(--text-dark);
    text-decoration: none;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.user-menu a:hover, .user-menu a.active {
    background-color: var(--primary);
    color: var(--white);
}

.user-content {
    margin-left: 270px;
}

/* 后台样式 */
.admin-header {
    background-color: var(--primary);
    color: var(--white);
    padding: 15px 0;
}

.admin-sidebar {
    width: 200px;
    float: left;
    background-color: var(--text-dark);
    height: calc(100vh - 70px);
    padding-top: 20px;
}

.admin-menu {
    list-style: none;
}

.admin-menu li {
    margin-bottom: 5px;
}

.admin-menu a {
    display: block;
    padding: 12px 15px;
    color: var(--white);
    text-decoration: none;
    transition: all 0.3s ease;
}

.admin-menu a:hover, .admin-menu a.active {
    background-color: var(--primary);
}

.admin-content {
    margin-left: 220px;
    padding: 20px;
}

/* 响应式 */
@media (max-width: 768px) {
    .header .nav {
        float: none;
        margin-top: 20px;
        text-align: center;
    }
    
    .header .nav a {
        margin: 0 10px;
    }
    
    .user-sidebar, .admin-sidebar {
        width: 100%;
        float: none;
        margin-bottom: 20px;
    }
    
    .user-content, .admin-content {
        margin-left: 0;
    }
    
    .hero h1 {
        font-size: 32px;
    }
}

/* 提示框样式 */
.alert {
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 5px;
}

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

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

/* 清除浮动 */
.clearfix::after {
    content: "";
    display: table;
    clear: both;
}

/* 悬浮效果 */
.hover-effect {
    transition: all 0.3s ease;
}

.hover-effect:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}