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

/* 基础样式 */
body {
    font-family: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

img, video { max-width: 100%; height: auto; display: block; }
.logo img { width: 36px; height: 36px; }
.nav-menu a { padding: 6px 0; }
.hero-image img { height: auto; }
.feature-card, .footer-section { word-wrap: break-word; }
.page-header { padding: 60px 0; background: #f8f9fb; text-align: center; }
.page-header h1 { font-size: 2.2rem; margin-bottom: 0.5rem; }
.page-header p { color: #666; }

/* 指南页布局增强 */
.steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.step-item { background: #fff; border-radius: 12px; padding: 1.25rem; box-shadow: 0 6px 20px rgba(0,0,0,0.06); }
.step-number { width: 36px; height: 36px; border-radius: 50%; background: #667eea; color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; margin-bottom: 0.75rem; }
.tutorial-content { display: grid; grid-template-columns: 1.2fr 1fr; gap: 1.5rem; align-items: center; }
.tutorial-content.reverse { grid-template-columns: 1fr 1.2fr; }
.tutorial-image img { border-radius: 12px; box-shadow: 0 10px 24px rgba(0,0,0,0.08); }
.advanced-tutorials { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.tutorial-card { background: #fff; border-radius: 12px; padding: 1.25rem; box-shadow: 0 6px 20px rgba(0,0,0,0.06); }
.tutorial-steps ol { padding-left: 1.25rem; }
.troubleshooting-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.25rem; }
.video-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
.video-thumbnail { position: relative; overflow: hidden; border-radius: 12px; }
.video-thumbnail .play-button { position: absolute; right: 12px; bottom: 12px; background: rgba(0,0,0,0.6); color: #fff; padding: 6px 10px; border-radius: 999px; font-size: 12px; }

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

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 24px;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 16px;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

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

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

/* 头部样式 */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.navbar {
    padding: 1rem 0;
}

.nav-menu li a { line-height: 1; }
.nav-menu li { display: flex; align-items: center; }
.hamburger { -webkit-tap-highlight-color: transparent; padding: 6px; }
.hamburger span { border-radius: 2px; }

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 24px;
    font-weight: bold;
    color: #667eea;
}

.logo img {
    width: 40px;
    height: 40px;
    margin-right: 10px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-menu a:hover {
    color: #667eea;
}

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

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

/* 主要内容 */
main {
    margin-top: 80px;
}

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

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}
.hero-content h1, .hero-content p { word-break: break-word; }

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.hero-image img {
    width: 100%;
    max-width: 500px;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

/* 功能预览 */
.features-preview {
    padding: 100px 0;
    background: #f8f9fa;
}

.features-preview h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #333;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #333;
}

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

/* 评测与社区头像样式兜底（防止图片缺失破版） */
.user-avatar { width: 56px; height: 56px; border-radius: 50%; object-fit: cover; background: #eef1f7; display: inline-block; }
img[src*="user-avatar-"] { width: 56px; height: 56px; border-radius: 50%; object-fit: cover; background: #eef1f7; }

/* 统计区域 */
.stats {
    padding: 80px 0;
    background: white;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    text-align: center;
}

.stat-item h3 {
    font-size: 3rem;
    color: #667eea;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.stat-item p {
    font-size: 1.1rem;
    color: #666;
    font-weight: 500;
}

/* 行动号召 */
.cta {
    background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
    color: white;
    padding: 100px 0;
    text-align: center;
}

.cta h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.cta p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

/* 页脚 */
.footer {
    background: #2c3e50;
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: #ecf0f1;
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

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

.footer-section a:hover {
    color: #ecf0f1;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    padding: 8px 16px;
    background: #34495e;
    border-radius: 5px;
    transition: background 0.3s ease;
}

.social-links a:hover {
    background: #667eea;
}

.footer-bottom {
    border-top: 1px solid #34495e;
    padding-top: 2rem;
    text-align: center;
    color: #bdc3c7;
}

.footer-bottom a {
    color: #bdc3c7;
    text-decoration: none;
}

.footer-bottom a:hover {
    color: #ecf0f1;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 2rem;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .steps-grid { grid-template-columns: 1fr; }
    .tutorial-content, .tutorial-content.reverse { grid-template-columns: 1fr; }
    .advanced-tutorials { grid-template-columns: 1fr; }
    .troubleshooting-grid { grid-template-columns: 1fr; }
    .video-grid { grid-template-columns: 1fr; }
    .page-header { padding: 44px 0; }
    .page-header h1 { font-size: 1.8rem; }
    .navbar .container { gap: 1rem; }
    .logo { font-size: 20px; }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 60px 0;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .features-preview,
    .stats,
    .cta {
        padding: 60px 0;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    .btn { width: 100%; text-align: center; }
    .hero-content p { font-size: 1rem; }
    .footer { padding: 40px 0 16px; }
}