/* 基础变量 */
:root {
    --primary-color: #3498DB;
    --dark-color: #2C3E50;
    --light-color: #ECF0F1;
    --transition-speed: 0.3s;
}

/* 英雄区域样式 */
.hero {
    background-color: var(--dark-color);
    color: white;
    padding: 100px 0;
    position: relative;
}

.hero:before {
    content: none;
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 600px;
}

.hero h1 {
    font-size: 2.8rem;
    margin-bottom: 20px;
    line-height: 1.2;
}

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

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 4px;
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    transition: background-color var(--transition-speed);
    border: none;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: #2980b9;
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: white;
}

.btn-download {
    background-color: white;
    color: var(--dark-color);
    margin-right: 10px;
    margin-bottom: 10px;
}

.btn-download:hover {
    background-color: var(--light-color);
}

/* 热门直播流样式 */
.featured-streams {
    padding: 50px 0;
    background-color: white;
}

.section-title {
    font-size: 2rem;
    margin-bottom: 30px;
    color: var(--dark-color);
    position: relative;
    padding-bottom: 15px;
}

.section-title:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 80px;
    height: 4px;
    background-color: var(--primary-color);
}

.stream-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}

.stream-card {
    background: var(--light-color);
    border-radius: 4px;
    overflow: hidden;
    transition: transform var(--transition-speed);
}

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

.stream-thumbnail {
    position: relative;
    padding-top: 56.25%; /* 16:9 宽高比 */
    overflow: hidden;
}

.stream-thumbnail img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s;
}

.stream-card:hover .stream-thumbnail img {
    transform: scale(1.05);
}

.live-tag {
    position: absolute;
    top: 10px;
    left: 10px;
    background: var(--primary-color);
    color: white;
    padding: 4px 8px;
    border-radius: 2px;
    font-size: 0.7rem;
    font-weight: bold;
    text-transform: uppercase;
}

.viewers {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: var(--dark-color);
    color: white;
    padding: 4px 8px;
    border-radius: 2px;
    font-size: 0.8rem;
}

.stream-info {
    padding: 15px;
}

.streamer {
    display: flex;
    align-items: center;
}

.streamer .avatar {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    object-fit: cover;
}

.streamer span {
    margin-left: 8px;
    font-size: 0.9rem;
    color: var(--dark-color);
}

.view-more {
    text-align: center;
    margin-top: 20px;
}

/* 下载APP区域 */
.download-app {
    padding: 70px 0;
    background-color: var(--primary-color);
    color: white;
    position: relative;
}

.download-app:before, .download-app:after {
    content: none;
}

.app-content {
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    z-index: 1;
}

.app-info {
    max-width: 600px;
}

.app-info h2 {
    font-size: 2.2rem;
    margin-bottom: 15px;
}

.app-info p {
    font-size: 1.1rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

.download-buttons {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

/* 分类样式 */
.categories {
    padding: 60px 0;
    background-color: var(--light-color);
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 20px;
}

.category-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: white;
    padding: 25px 15px;
    border-radius: 4px;
    transition: all var(--transition-speed);
    text-align: center;
    text-decoration: none;
    color: var(--dark-color);
}

.category-card:hover {
    transform: translateY(-5px);
    background-color: var(--primary-color);
    color: white;
}

.category-card i {
    font-size: 2rem;
    margin-bottom: 15px;
}

.category-card h3 {
    font-size: 1rem;
    margin: 0;
}

/* 明星主播样式 */
.featured-streamers {
    padding: 60px 0;
    background-color: white;
}

.streamers-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.streamer-profile {
    text-align: center;
}

.streamer-avatar {
    width: 120px;
    height: 120px;
    margin: 0 auto 15px;
    border-radius: 50%;
    overflow: hidden;
}

.streamer-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.streamer-profile h3 {
    margin: 0 0 5px;
    font-size: 1.2rem;
    color: var(--dark-color);
}

.streamer-profile p {
    margin: 0;
    color: #7f8c8d;
    font-size: 0.9rem;
}

/* 为什么选择我们 */
.why-us {
    padding: 60px 0;
    background-color: var(--light-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature {
    background-color: white;
    padding: 30px;
    border-radius: 4px;
    text-align: center;
}

.feature i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.feature h3 {
    margin: 0 0 10px;
    color: var(--dark-color);
}

.feature p {
    margin: 0;
    color: #7f8c8d;
}

/* 响应式调整 */
@media (max-width: 992px) {
    .stream-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .category-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .streamers-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .app-info h2 {
        font-size: 1.8rem;
    }
}

@media (max-width: 768px) {
    .hero {
        padding: 80px 0;
    }
    
    .hero h1 {
        font-size: 2.2rem;
    }
    
    .stream-grid, 
    .streamers-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .features-grid {
        grid-template-columns: repeat(1, 1fr);
        gap: 20px;
    }
}

@media (max-width: 576px) {
    .hero {
        padding: 60px 0;
    }
    
    .hero h1 {
        font-size: 1.8rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .stream-grid,
    .streamers-grid {
        grid-template-columns: 1fr;
    }
    
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}