/* 全局样式 */
:root {
    --bg-color: #F7F8FA;
    --card-bg-color: #FFFFFF;
    --text-color: #1A202C;
    --brand-color: #3B82F6;
    --sidebar-width: 250px;
    --header-height: 60px;
    --transition-speed: 0.3s;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: var(--brand-color);
}

ul {
    list-style: none;
}

/* 容器布局 */
.container {
    display: flex;
    min-height: 100vh;
}

/* 侧边栏样式 */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--card-bg-color);
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    transition: transform var(--transition-speed);
    z-index: 1000;
}

.logo-container {
    padding: 20px;
    text-align: center;
    border-bottom: 1px solid var(--bg-color);
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--brand-color);
}

.main-nav ul {
    padding: 20px 0;
}

.main-nav li {
    margin-bottom: 5px;
}

.main-nav a {
    display: flex;
    align-items: center;
    padding: 10px 20px;
    color: var(--text-color);
    transition: background-color var(--transition-speed);
}

.main-nav a:hover {
    background-color: var(--bg-color);
}

.main-nav a i {
    margin-right: 10px;
    color: var(--brand-color);
}

/* 内容区样式 */
.content {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
}

/* 页头样式 */
.header {
    height: var(--header-height);
    background-color: var(--card-bg-color);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    position: sticky;
    top: 0;
    z-index: 900;
}

.mobile-menu-toggle {
    display: none;
    cursor: pointer;
    font-size: 24px;
}

.search-container {
    display: flex;
    align-items: center;
    background-color: var(--bg-color);
    border-radius: 20px;
    padding: 5px 15px;
    width: 300px;
}

.search-input {
    border: none;
    background: transparent;
    padding: 5px;
    width: 100%;
    outline: none;
}

.search-button {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--brand-color);
}

.language-switcher {
    display: flex;
    align-items: center;
}

.lang-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    color: var(--text-color);
    opacity: 0.7;
    transition: opacity var(--transition-speed);
}

.lang-btn.active {
    opacity: 1;
    font-weight: 500;
}

/* 首页内容样式 */
.home-content, .category-content {
    padding: 40px;
    flex: 1;
    display: none;
}

.home-content.active, .category-content.active {
    display: block;
}

.hero {
    text-align: center;
    max-width: 800px;
    margin: 60px auto;
}

.main-title {
    font-size: 32px;
    margin-bottom: 15px;
    color: var(--text-color);
}

.sub-title {
    font-size: 18px;
    margin-bottom: 30px;
    color: var(--text-color);
    opacity: 0.8;
}

.hero-search {
    display: flex;
    align-items: center;
    background-color: var(--card-bg-color);
    border-radius: 30px;
    padding: 10px 20px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    max-width: 600px;
    margin: 0 auto;
}

.hero-search-input {
    border: none;
    background: transparent;
    padding: 10px;
    width: 100%;
    font-size: 16px;
    outline: none;
}

.hero-search-button {
    background: var(--brand-color);
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: white;
}

/* 分类内容页样式 */
.category-title {
    font-size: 28px;
    margin-bottom: 30px;
    color: var(--text-color);
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

/* 卡片样式 */
.card {
    background-color: var(--card-bg-color);
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    overflow: hidden;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.card-header {
    padding: 20px;
    border-bottom: 1px solid var(--bg-color);
}

.card-title {
    font-size: 18px;
    font-weight: 500;
}

.card-body {
    padding: 20px;
}

.card-description {
    font-size: 14px;
    color: var(--text-color);
    opacity: 0.8;
}

.card-footer {
    padding: 15px 20px;
    border-top: 1px solid var(--bg-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-link {
    display: flex;
    align-items: center;
    font-size: 14px;
    font-weight: 500;
}

.card-link i {
    margin-right: 5px;
}

.card-tags {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.card-platform {
    font-size: 12px;
    background-color: var(--bg-color);
    padding: 3px 8px;
    border-radius: 15px;
    margin-bottom: 5px;
}

.tags {
    display: flex;
    gap: 5px;
}

.tag {
    font-size: 12px;
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--brand-color);
    padding: 2px 6px;
    border-radius: 10px;
}

/* 页脚样式 */
.footer {
    background-color: var(--card-bg-color);
    padding: 20px 40px;
    margin-top: auto;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.footer-links {
    display: flex;
    gap: 20px;
}

.contact, .copyright {
    font-size: 14px;
    color: var(--text-color);
    opacity: 0.7;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .content {
        margin-left: 0;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .search-container {
        width: 200px;
    }

    .home-content, .category-content {
        padding: 20px;
    }

    .hero {
        margin: 30px auto;
    }

    .main-title {
        font-size: 24px;
    }

    .sub-title {
        font-size: 16px;
    }

    .card-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

/* 首页分类卡片样式 */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 40px;
}

.category-card {
    background-color: var(--card-bg-color);
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    padding: 20px;
    text-align: center;
    cursor: pointer;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.category-icon {
    font-size: 36px;
    color: var(--brand-color);
    margin-bottom: 15px;
}

.category-card h3 {
    font-size: 18px;
    margin-bottom: 10px;
}

.category-card p {
    font-size: 14px;
    color: var(--text-color);
    opacity: 0.7;
}