/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    background-color: #1a1b1e;
    color: #e4e6eb;
    min-height: 100vh;
}

/* 布局 */
.layout {
    display: flex;
    min-height: 100vh;
    opacity: 0;
    animation: fadeIn 0.3s ease-out forwards;
}

/* 侧边栏样式 */
.sidebar {
    width: 250px;
    background-color: #2d2e32;
    padding: 2rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.logo h1 {
    font-size: 1.5rem;
    color: #fff;
    margin-bottom: 2rem;
    padding-left: 0.5rem;
}

.nav-section {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.section-title {
    font-size: 0.9rem;
    color: #8b8c8f;
    padding: 0.5rem;
    margin-bottom: 0.5rem;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.8rem;
    color: #a1a2a5;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.nav-item:hover {
    background-color: #3a3b3f;
    color: #fff;
}

.nav-item.active {
    background-color: #3a3b3f;
    color: #fff;
}

.nav-item i {
    width: 20px;
    text-align: center;
}

/* 主内容区域 */
.content {
    flex: 1;
    margin-left: 250px;
    padding: 2rem;
    background-color: #1a1b1e;
    position: relative;
    min-height: 100vh;
}

/* 搜索框 */
.search-box {
    position: relative;
    max-width: 600px;
    margin-bottom: 3rem;
}

.search-box::after {
    content: '';
    position: absolute;
    right: 3.5rem;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    border-radius: 50%;
    opacity: 0;
    transition: all 0.3s ease;
}

.search-box.has-results::after {
    background-color: #4caf50;
    opacity: 1;
}

.search-box.no-results::after {
    background-color: #f44336;
    opacity: 1;
}

.search-box input {
    width: 100%;
    padding: 1rem 4.5rem 1rem 1.5rem;
    border: none;
    border-radius: 12px;
    background-color: #2d2e32;
    color: #fff;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.search-box input:focus {
    outline: none;
    background-color: #3a3b3f;
}

.search-box input::placeholder {
    color: #8b8c8f;
}

.search-box i {
    position: absolute;
    right: 1.5rem;
    top: 50%;
    transform: translateY(-50%);
    color: #8b8c8f;
    transition: all 0.3s ease;
}

.search-box.has-results i {
    color: #4caf50;
}

.search-box.no-results i {
    color: #f44336;
}

/* 欢迎区域 */
.welcome-section {
    margin-bottom: 3rem;
}

.welcome-section h2 {
    font-size: 2.5rem;
    color: #fff;
    margin-bottom: 0.5rem;
}

.welcome-section h3 {
    font-size: 2rem;
    color: #4a9eff;
    margin-bottom: 1rem;
}

.welcome-section .subtitle {
    color: #8b8c8f;
    font-size: 1.1rem;
}

/* 分类样式 */
.category {
    background-color: #2d2e32;
    border-radius: 15px;
    padding: 2rem;
    margin-bottom: 2rem;
    transform: translateZ(0);
    will-change: transform, opacity;
    animation: none;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.category h2 {
    color: #fff;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 1.2rem;
}

.category h2 i {
    color: #4a9eff;
}

/* 网站卡片网格 */
.sites-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
}

/* 网站卡片样式 */
.site-card {
    background-color: #3a3b3f;
    border-radius: 12px;
    padding: 1.5rem;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    backface-visibility: hidden;
    transform: translateZ(0);
    will-change: transform;
}

.site-card:hover {
    transform: translateY(-5px);
    background-color: #4a4b4f;
}

.site-card i {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: #4a9eff;
}

.site-card h3 {
    margin-bottom: 0.5rem;
    color: #fff;
}

.site-card p {
    font-size: 0.9rem;
    color: #8b8c8f;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .sidebar {
        width: 70px;
        padding: 1rem 0.5rem;
    }

    .sidebar .logo h1,
    .sidebar .section-title,
    .sidebar .nav-item span {
        display: none;
    }

    .nav-item {
        padding: 0.8rem;
        justify-content: center;
    }

    .nav-item i {
        margin: 0;
        font-size: 1.2rem;
    }

    .content {
        margin-left: 70px;
        padding: 1rem;
    }

    .welcome-section h2 {
        font-size: 2rem;
    }

    .welcome-section h3 {
        font-size: 1.5rem;
    }

    .page {
        transform: translateX(10px);
    }
    
    #search-results {
        transform: translateY(10px);
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.category {
    animation: fadeIn 0.5s ease-out forwards;
}

/* 页面切换动画 */
.page {
    position: absolute;
    width: 100%;
    opacity: 0;
    visibility: hidden;
    transform: translateX(20px);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0s linear 0.3s;
    will-change: opacity, transform;
}

.page.active {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
    transition-delay: 0s;
}

/* 搜索结果页面特殊处理 */
#search-results {
    transform: translateY(20px);
}

#search-results.active {
    transform: translateY(0);
}

/* 搜索结果区域动画 */
.search-section {
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.search-section[style*="display: block"] {
    opacity: 1;
    transform: translateY(0);
}

/* 优化卡片动画 */
.site-card {
    backface-visibility: hidden;
    transform: translateZ(0);
    will-change: transform;
}

/* 优化动画性能 */
.category {
    transform: translateZ(0);
    will-change: transform, opacity;
    animation: none;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.category[style*="display: block"],
.page.active .category {
    opacity: 1;
}