* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
}

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

/* 导航栏 */
header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(14, 165, 233, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    font-size: 28px;
    font-weight: bold;
    background: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-links a {
    text-decoration: none;
    color: #0c4a6e;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #0ea5e9;
}

.download-btn {
    background: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 100%);
    color: white !important;
    padding: 10px 25px;
    border-radius: 25px;
    transition: transform 0.3s, box-shadow 0.3s !important;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(14, 165, 233, 0.4);
    color: white !important;
}

/* Hero区域 */
.hero {
    margin-top: 70px;
    padding: 80px 0;
    background: linear-gradient(rgba(14, 165, 233, 0.8), rgba(6, 182, 212, 0.8)), url('../images/banner.jpg') center/cover no-repeat;
    color: white;
    text-align: center;
}

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

.hero p {
    font-size: 20px;
    margin-bottom: 30px;
    opacity: 0.95;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

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

.btn {
    padding: 15px 40px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: bold;
    font-size: 18px;
    transition: all 0.3s;
    display: inline-block;
}

.btn-primary {
    background: white;
    color: #0ea5e9;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

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

.btn-secondary:hover {
    background: white;
    color: #0ea5e9;
}

/* 通用区块 */
.section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 36px;
    margin-bottom: 15px;
    color: #0c4a6e;
}

.section-subtitle {
    text-align: center;
    color: #0369a1;
    font-size: 18px;
    margin-bottom: 50px;
}

/* 主播卡片 */
.hosts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.host-card {
    background: white;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(14, 165, 233, 0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.host-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(14, 165, 233, 0.2);
}

.host-card img {
    width: 100%;
    height: 320px;
    object-fit: cover;
}

.host-info {
    padding: 20px;
    text-align: center;
}

.host-name {
    font-size: 20px;
    font-weight: bold;
    color: #0c4a6e;
    margin-bottom: 8px;
}

.host-desc {
    color: #0369a1;
    font-size: 14px;
}

.host-tag {
    display: inline-block;
    background: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 100%);
    color: white;
    padding: 3px 12px;
    border-radius: 15px;
    font-size: 12px;
    margin-top: 10px;
}

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

.feature-card {
    background: white;
    padding: 35px;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(14, 165, 233, 0.08);
    transition: all 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(14, 165, 233, 0.15);
}

.feature-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, #e0f2fe 0%, #bae6fd 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 30px;
}

.feature-card h3 {
    font-size: 22px;
    color: #0c4a6e;
    margin-bottom: 15px;
}

.feature-card p {
    color: #0369a1;
    line-height: 1.7;
}

/* 下载区域 */
.download-section {
    background: linear-gradient(135deg, #0c4a6e 0%, #0369a1 100%);
    color: white;
}

.download-section .section-title,
.download-section .section-subtitle {
    color: white;
}

.download-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.download-screens {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.download-screens img {
    width: 45%;
    border-radius: 20px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.3);
}

.download-info h3 {
    font-size: 28px;
    margin-bottom: 25px;
}

.download-list {
    list-style: none;
    margin-bottom: 35px;
}

.download-list li {
    padding: 12px 0;
    font-size: 17px;
    padding-left: 30px;
    position: relative;
}

.download-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #7dd3fc;
    font-weight: bold;
    font-size: 20px;
}

.download-buttons {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.btn-android, .btn-ios {
    padding: 15px 35px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: bold;
    font-size: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: transform 0.3s;
}

.btn-android {
    background: #22c55e;
    color: white;
}

.btn-ios {
    background: white;
    color: #0c4a6e;
}

.btn-android:hover, .btn-ios:hover {
    transform: translateY(-3px);
}

/* 文章内容SEO区域 */
.article-section {
    background: white;
}

.article-content {
    max-width: 900px;
    margin: 0 auto;
    font-size: 17px;
    line-height: 1.9;
    color: #334155;
}

.article-content h2 {
    font-size: 28px;
    color: #0c4a6e;
    margin: 40px 0 20px;
}

.article-content h3 {
    font-size: 22px;
    color: #0369a1;
    margin: 30px 0 15px;
}

.article-content p {
    margin-bottom: 20px;
    text-indent: 2em;
}

.article-content ul {
    margin: 20px 0;
    padding-left: 40px;
}

.article-content ul li {
    margin-bottom: 10px;
}

/* FAQ区域 */
.faq-section {
    background: #f0f9ff;
}

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

.faq-item {
    background: white;
    border-radius: 15px;
    margin-bottom: 15px;
    overflow: hidden;
    box-shadow: 0 3px 15px rgba(14, 165, 233, 0.08);
}

.faq-question {
    padding: 22px 30px;
    font-size: 18px;
    font-weight: 600;
    color: #0c4a6e;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.3s;
}

.faq-question:hover {
    background: #f0f9ff;
}

.faq-question::after {
    content: "+";
    font-size: 24px;
    color: #0ea5e9;
    transition: transform 0.3s;
}

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

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    padding: 0 30px;
    color: #0369a1;
    line-height: 1.8;
}

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

/* 页脚 */
footer {
    background: #0c4a6e;
    color: #bae6fd;
    padding: 50px 0 30px;
    text-align: center;
}

.footer-content {
    margin-bottom: 30px;
}

.footer-logo {
    font-size: 26px;
    font-weight: bold;
    color: white;
    margin-bottom: 20px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    list-style: none;
    margin-bottom: 25px;
    flex-wrap: wrap;
}

.footer-links a {
    color: #bae6fd;
    text-decoration: none;
    transition: color 0.3s;
}

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

.copyright {
    border-top: 1px solid #0369a1;
    padding-top: 25px;
    font-size: 14px;
    opacity: 0.8;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #0ea5e9 0%, #06b6d4 100%);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    z-index: 999;
    box-shadow: 0 5px 20px rgba(14, 165, 233, 0.4);
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-3px);
}

/* 响应式适配 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero h1 {
        font-size: 32px;
    }

    .hero p {
        font-size: 16px;
    }

    .section-title {
        font-size: 28px;
    }

    .download-content {
        grid-template-columns: 1fr;
    }

    .download-screens {
        order: 2;
    }

    .download-buttons {
        justify-content: center;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
}

img {
    max-width: 100%;
    height: auto;
}