/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏样式 */
.navbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    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 h2 {
    color: white;
    font-size: 1.5rem;
    font-weight: 600;
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-item {
    position: relative;
}

.nav-link {
    color: white;
    text-decoration: none;
    font-weight: 500;
    padding: 10px 15px;
    border-radius: 5px;
    transition: all 0.3s ease;
    display: block;
}

.nav-link:hover {
    background-color: rgba(255,255,255,0.1);
    transform: translateY(-2px);
}

/* 下拉菜单 */
.dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    min-width: 250px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
    border-radius: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1001;
}

.nav-item:hover .dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown a {
    display: block;
    padding: 12px 20px;
    color: #333;
    text-decoration: none;
    border-bottom: 1px solid #f0f0f0;
    transition: all 0.3s ease;
}

.dropdown a:last-child {
    border-bottom: none;
}

.dropdown a:hover {
    background-color: #f8f9fa;
    color: #667eea;
    padding-left: 25px;
}

/* 汉堡菜单 */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background-color: white;
    margin: 3px 0;
    transition: 0.3s;
}

/* 主要内容区域 */
.main-content {
    padding-top: 20px;
}

/* 英雄区域 */
.hero-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 60px 0;
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.hero-subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* 章节样式 */
.section {
    padding: 60px 0;
    background: white;
    margin-bottom: 20px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 40px;
    color: #333;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 2px;
}

/* 卡片网格 */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    border: 1px solid #e9ecef;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

.card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.card-content {
    padding: 25px;
}

.card-content h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: #333;
}

.card-subtitle {
    color: #666;
    margin-bottom: 20px;
    font-style: italic;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 25px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    text-align: center;
}

.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-success {
    background: linear-gradient(135deg, #4CAF50 0%, #45a049 100%);
    color: white;
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(76, 175, 80, 0.4);
}

.btn-large {
    padding: 15px 30px;
    font-size: 1.1rem;
}

.btn-outline {
    background: transparent;
    color: #667eea;
    border: 2px solid #667eea;
}

.btn-outline:hover {
    background: #667eea;
    color: white;
}

.btn-telegram {
    background: #0088cc;
    color: white;
}

.btn-telegram:hover {
    background: #006699;
    transform: translateY(-2px);
}

/* 信息框 */
.info-box {
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
    padding: 20px;
    border-radius: 10px;
    margin: 30px 0;
    border-left: 5px solid #2196F3;
}

.info-text {
    font-size: 1.1rem;
    color: #1565c0;
    font-weight: 500;
}

/* 注册按钮区域 */
.register-buttons {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: 30px;
}

/* 教程网格 */
.tutorial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin: 40px 0;
}

.tutorial-card {
    background: white;
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.tutorial-card:hover {
    transform: translateY(-5px);
    border-color: #667eea;
    box-shadow: 0 15px 30px rgba(0,0,0,0.15);
}

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

.tutorial-card h3 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: #333;
}

/* Telegram群组 */
.telegram-group {
    text-align: center;
    margin-top: 50px;
    padding: 30px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 15px;
}

.telegram-image {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    margin-bottom: 20px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

/* 续费内容 */
.renewal-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.renewal-steps {
    margin-top: 40px;
}

.step {
    background: white;
    padding: 30px;
    margin: 20px 0;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    border-left: 5px solid #667eea;
}

.step h3 {
    color: #333;
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.device-tutorials {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 20px;
    justify-content: center;
}

.device-tag {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
}

/* 注册步骤 */
.register-steps {
    max-width: 800px;
    margin: 0 auto;
}

.step-card {
    display: flex;
    background: white;
    margin: 30px 0;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    overflow: hidden;
}

.step-number {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    width: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: bold;
}

.step-content {
    padding: 30px;
    flex: 1;
}

.step-content h3 {
    color: #333;
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.step-details {
    margin-top: 20px;
}

.example {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
    margin-top: 15px;
    border-left: 4px solid #667eea;
}

/* 页脚 */
.footer {
    background: #2c3e50;
    color: white;
    padding: 50px 0 20px;
    margin-top: 50px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 30px;
}

.footer-section h3 {
    margin-bottom: 20px;
    color: #ecf0f1;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: #667eea;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #34495e;
    color: #bdc3c7;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: #667eea;
        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: 10px 0;
    }
    
    .dropdown {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        background: rgba(255,255,255,0.1);
        margin-top: 10px;
    }
    
    .dropdown a {
        color: white;
        border-bottom: 1px solid rgba(255,255,255,0.1);
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .card-grid {
        grid-template-columns: 1fr;
    }
    
    .tutorial-grid {
        grid-template-columns: 1fr;
    }
    
    .register-buttons {
        align-items: center;
    }
    
    .step-card {
        flex-direction: column;
    }
    
    .step-number {
        width: 100%;
        height: 60px;
    }
    
    .device-tutorials {
        flex-direction: column;
        align-items: center;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero-title {
        font-size: 1.8rem;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .btn-large {
        padding: 12px 20px;
        font-size: 1rem;
    }
    
    .card-content {
        padding: 20px;
    }
    
    .step-content {
        padding: 20px;
    }
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section {
    animation: fadeInUp 0.6s ease-out;
}

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

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

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #5a6fd8 0%, #6a4190 100%);
}