/* 海角登录网页版入口 - 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #e74c3c;
    --secondary-color: #2c3e50;
    --accent-color: #f39c12;
    --text-color: #333;
    --bg-color: #f8f9fa;
    --card-bg: #fff;
    --border-color: #e0e0e0;
    --shadow: 0 2px 15px rgba(0,0,0,0.1);
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    opacity: 0;
    transition: opacity 0.3s ease;
}

body.loaded {
    opacity: 1;
}

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

/* 头部样式 */
header {
    background: linear-gradient(135deg, var(--secondary-color) 0%, #34495e 100%);
    color: white;
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.logo-area h1 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 5px;
}

.logo-area h1 a {
    color: white;
    text-decoration: none;
    transition: var(--transition);
}

.logo-area h1 a:hover {
    color: var(--accent-color);
}

.logo-area p {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* 导航菜单 */
.nav-menu {
    display: flex;
    gap: 25px;
    list-style: none;
}

.nav-menu a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    padding: 8px 15px;
    border-radius: 5px;
}

.nav-menu a:hover {
    background-color: var(--primary-color);
    transform: translateY(-2px);
}

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

.menu-toggle span {
    width: 25px;
    height: 3px;
    background: white;
    transition: var(--transition);
}

/* 搜索框 */
.search-form {
    margin-top: 10px;
    width: 100%;
}

.search-form input {
    width: 100%;
    padding: 12px 20px;
    border: none;
    border-radius: 25px;
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
}

.search-form input:focus {
    box-shadow: 0 0 15px rgba(255,255,255,0.3);
}

/* 主要内容区 */
main {
    padding: 40px 0;
    min-height: calc(100vh - 400px);
}

.page-title {
    font-size: 2.2rem;
    color: var(--secondary-color);
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 3px solid var(--primary-color);
    position: relative;
}

.page-title::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 100px;
    height: 3px;
    background: var(--accent-color);
}

/* 视频网格 */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.video-card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
}

.video-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.video-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: var(--transition);
}

.video-card:hover img {
    transform: scale(1.1);
}

.video-info {
    padding: 20px;
}

.video-info h3 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: var(--secondary-color);
    line-height: 1.4;
}

.video-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: #666;
    margin-top: 10px;
}

.video-tags {
    display: flex;
    gap: 8px;
    margin-top: 10px;
    flex-wrap: wrap;
}

.tag {
    background: linear-gradient(135deg, var(--primary-color), #c0392b);
    color: white;
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 0.8rem;
    transition: var(--transition);
}

.tag:hover {
    transform: scale(1.05);
    box-shadow: 0 2px 8px rgba(231, 76, 60, 0.4);
}

/* 分类列表 */
.category-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.category-item {
    background: linear-gradient(135deg, var(--primary-color), #c0392b);
    color: white;
    padding: 30px;
    border-radius: 12px;
    text-align: center;
    text-decoration: none;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.category-item:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 8px 25px rgba(231, 76, 60, 0.3);
}

.category-item h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
}

/* 内容区块 */
.content-section {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    margin-bottom: 30px;
    box-shadow: var(--shadow);
}

.content-section h2 {
    color: var(--secondary-color);
    margin-bottom: 20px;
    font-size: 1.8rem;
    border-left: 4px solid var(--primary-color);
    padding-left: 15px;
}

.content-section p {
    line-height: 1.8;
    margin-bottom: 15px;
    text-align: justify;
}

.content-section ul {
    margin-left: 20px;
    margin-bottom: 15px;
}

.content-section ul li {
    margin-bottom: 10px;
    line-height: 1.8;
}

/* 特色区块 */
.feature-box {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 40px;
    border-radius: 12px;
    margin-bottom: 30px;
    text-align: center;
}

.feature-box h2 {
    font-size: 2rem;
    margin-bottom: 20px;
}

/* 底部 */
footer {
    background: var(--secondary-color);
    color: white;
    padding: 40px 0 20px;
    margin-top: 60px;
}

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

.footer-section h3 {
    margin-bottom: 15px;
    color: var(--accent-color);
    font-size: 1.2rem;
}

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

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

.footer-section a {
    color: #bdc3c7;
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: white;
    padding-left: 5px;
}

.copyright {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: #bdc3c7;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    z-index: 999;
}

.back-to-top:hover {
    background: #c0392b;
    transform: translateY(-5px);
}

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

    .nav-menu {
        display: none;
        flex-direction: column;
        width: 100%;
        position: absolute;
        top: 100%;
        left: 0;
        background: var(--secondary-color);
        padding: 20px;
    }

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

    .video-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: 20px;
    }

    .page-title {
        font-size: 1.8rem;
    }

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

@media (max-width: 480px) {
    .video-grid {
        grid-template-columns: 1fr;
    }

    .category-list {
        grid-template-columns: 1fr;
    }
}