/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

.container {
    max-width: 100%;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏样式 */
.navbar {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo a {
    font-size: 24px;
    font-weight: bold;
    color: #007bff;
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    align-items: center;
}

.nav-item {
    margin-left: 30px;
}

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
    padding: 10px 0;
}

.nav-link:hover,
.nav-link.active {
    color: #007bff;
}

.login-btn {
    background: #007bff;
    color: white !important;
    padding: 8px 20px !important;
    border-radius: 5px;
}

.login-btn:hover {
    background: #0056b3;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 3px 0;
    transition: 0.3s;
}

/* 主内容区 */
.main-content {
    margin-top: 70px;
    min-height: calc(100vh - 140px);
}

/* 英雄区域 */
.hero-section {
    background: linear-gradient(135deg, #007bff 0%, #0056b3 100%);
    color: white;
    padding: 100px 0;
    text-align: center;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 20px;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 30px;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 500;
    transition: all 0.3s;
    display: inline-block;
}

.btn.primary {
    background: white;
    color: #007bff;
}

.btn.primary:hover {
    background: #f8f9fa;
    transform: translateY(-2px);
}

.btn.secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn.secondary:hover {
    background: white;
    color: #007bff;
}

/* 功能区域 */
.features-section {
    padding: 80px 0;
}

.features-section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 50px;
    color: #333;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    background: white;
    padding: 40px 30px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

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

.feature-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #333;
}

.feature-card p {
    color: #666;
    line-height: 1.6;
}

/* 页脚 */
.footer {
    background: #333;
    color: white;
    text-align: center;
    padding: 30px 0;
}

/* 登录页面样式 */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #007bff 0%, #0056b3 100%);
    padding: 20px;
}

.login-form {
    background: white;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    width: 100%;
    max-width: 400px;
}

.login-form h2 {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
}

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

.form-group label {
    display: block;
    margin-bottom: 5px;
    color: #666;
    font-weight: 500;
}

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

.form-group input:focus {
    outline: none;
    border-color: #007bff;
}

.login-btn-form {
    width: 100%;
    padding: 12px;
    background: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.3s;
}

.login-btn-form:hover {
    background: #0056b3;
}

.form-links {
    text-align: center;
    margin-top: 20px;
}

.form-links a {
    color: #007bff;
    text-decoration: none;
}

/* 账户管理页面样式 */
.account-container {
    padding: 40px 20px;
    max-width: 100%;
    margin: 70px auto 0;
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: 30px;
}

.account-sidebar {
    background: white;
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    height: fit-content;
}

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

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

.account-menu a {
    display: block;
    padding: 15px 20px;
    text-decoration: none;
    color: #333;
    border-radius: 5px;
    transition: all 0.3s;
}

.account-menu a:hover,
.account-menu a.active {
    background: #007bff;
    color: white;
}

.account-content {
    background: white;
    border-radius: 10px;
    padding: 40px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.account-section {
    display: none;
}

.account-section.active {
    display: block;
}

.section-title {
    font-size: 1.8rem;
    margin-bottom: 30px;
    color: #333;
    border-bottom: 2px solid #007bff;
    padding-bottom: 10px;
}

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

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

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

/* 响应式设计 */
@media screen and (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0,0,0,0.05);
        padding: 20px 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-item {
        margin: 15px 0;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .hero-content p {
        font-size: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 200px;
        text-align: center;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .account-container {
        padding: 20px 10px;
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .account-sidebar,
    .account-content {
        padding: 20px;
    }
}

@media screen and (max-width: 480px) {
    .nav-container {
        padding: 0 15px;
    }
    
    .hero-section {
        padding: 60px 0;
    }
    
    .features-section {
        padding: 40px 0;
    }
    
    .login-form {
        padding: 30px 20px;
    }
}