* {
    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: #f8f9fa;
}

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

/* 导航栏 */
.navbar {
    background: linear-gradient(135deg, #4A90D9, #357ABD);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(74,144,217,0.3);
}

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

.nav-brand a {
    color: white;
    font-size: 24px;
    font-weight: bold;
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 25px;
}

.nav-menu a {
    color: rgba(255,255,255,0.9);
    text-decoration: none;
    font-size: 16px;
    transition: color 0.3s;
    padding: 5px 0;
    border-bottom: 2px solid transparent;
}

.nav-menu a:hover {
    color: white;
    border-bottom-color: white;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: white;
    border-radius: 3px;
}

/* 英雄区 */
.hero {
    background: linear-gradient(135deg, #4A90D9 0%, #6CB4EE 50%, #A8D8EA 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
}

.hero .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 40px;
}

.hero-content {
    flex: 1;
    min-width: 300px;
}

.hero-content h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-content p {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 30px;
    max-width: 600px;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 14px 35px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.btn-primary {
    background: white;
    color: #4A90D9;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.2);
}

.btn-secondary {
    background: transparent;
    color: white;
    border-color: white;
}

.btn-secondary:hover {
    background: white;
    color: #4A90D9;
}

.btn-small {
    padding: 10px 25px;
    font-size: 14px;
}

.version-info {
    margin-top: 25px;
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    font-size: 14px;
    opacity: 0.8;
}

.hero-image img {
    width: 280px;
    border-radius: 30px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

/* 通用标题 */
.section-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 50px;
    color: #2c3e50;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: #4A90D9;
    margin: 15px auto;
    border-radius: 2px;
}

/* 功能卡片 */
.features {
    padding: 80px 0;
    background: white;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.feature-card {
    background: #f8f9fa;
    border-radius: 20px;
    padding: 35px 25px;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 5px 20px rgba(0,0,0,0.05);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(74,144,217,0.15);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: #2c3e50;
}

.feature-card p {
    color: #666;
    font-size: 0.95rem;
}

/* 兼容性 */
.compatibility {
    padding: 80px 0;
    background: #f0f4f8;
}

.compat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 30px;
    max-width: 700px;
    margin: 0 auto;
}

.compat-card {
    background: white;
    border-radius: 20px;
    padding: 40px 30px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0,0,0,0.05);
    transition: transform 0.3s;
}

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

.compat-card h3 {
    font-size: 1.5rem;
    color: #4A90D9;
    margin-bottom: 15px;
}

.compat-card p {
    margin-bottom: 20px;
    color: #666;
}

/* 评价 */
.reviews-section {
    padding: 80px 0;
    background: white;
}

.rating-summary {
    text-align: center;
    margin-bottom: 40px;
}

.rating-score {
    font-size: 3rem;
    font-weight: bold;
    color: #f39c12;
    display: block;
}

.stars {
    font-size: 28px;
    color: #f39c12;
    letter-spacing: 3px;
    margin: 10px 0;
}

.stars-small {
    color: #f39c12;
    font-size: 16px;
    letter-spacing: 2px;
}

.rating-count {
    color: #999;
    font-size: 14px;
}

.reviews-carousel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
}

.review-card {
    background: #f8f9fa;
    border-radius: 16px;
    padding: 25px;
    transition: all 0.3s;
}

.review-card:hover {
    box-shadow: 0 8px 30px rgba(0,0,0,0.08);
}

.review-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.review-card p {
    color: #555;
    font-style: italic;
}

/* 二维码 */
.qrcode-section {
    padding: 80px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    text-align: center;
}

.qrcode-section .section-title {
    color: white;
}

.qrcode-section .section-title::after {
    background: white;
}

.qrcode-container {
    display: inline-block;
    background: white;
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
}

.qrcode-container p {
    margin-top: 20px;
    color: #666;
    font-size: 14px;
}

#qrcode {
    display: inline-block;
}

/* FAQ */
.faq-section {
    padding: 80px 0;
    background: #f0f4f8;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: white;
    border-radius: 16px;
    margin-bottom: 15px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.faq-question {
    width: 100%;
    padding: 20px 25px;
    text-align: left;
    background: white;
    border: none;
    font-size: 16px;
    font-weight: 600;
    color: #2c3e50;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.3s;
}

.faq-question:hover {
    background: #f8f9fa;
}

.faq-icon {
    font-size: 22px;
    transition: transform 0.3s;
    color: #4A90D9;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    padding: 0 25px;
}

.faq-item.active .faq-answer {
    max-height: 300px;
    padding: 0 25px 20px;
}

.faq-answer p {
    color: #666;
    line-height: 1.8;
}

/* 页脚 */
.footer {
    background: #2c3e50;
    color: white;
    padding: 40px 0;
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 20px;
}

.footer-links a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: white;
}

.footer p {
    font-size: 14px;
    opacity: 0.7;
}

/* 响应式 */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #4A90D9;
        flex-direction: column;
        padding: 20px;
        gap: 15px;
        box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    }

    .nav-menu.active {
        display: flex;
    }

    .hero-content h1 {
        font-size: 1.8rem;
    }

    .hero .container {
        flex-direction: column;
        text-align: center;
    }

    .hero-image img {
        width: 200px;
    }

    .version-info {
        flex-direction: column;
        gap: 5px;
    }
}