/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    transition: background-color 0.3s ease;
}

/* 明亮主题变量 */
:root {
    --bg-color: #f8f9fa;
    --text-color: #2c3e50;
    --primary-color: #4a90e2;
    --secondary-color: #5856D6;
    --border-color: #E5E5EA;
    --card-bg: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --hover-bg: #f5f5f5;
    --category-bg: rgba(255, 255, 255, 0.9);
    --card-hover-shadow: rgba(74, 144, 226, 0.2);
    --navbar-bg: linear-gradient(135deg, #4a90e2, #5856D6);
    --navbar-text: #ffffff;
}

/* 暗黑主题变量 */
[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --text-color: #ffffff;
    --primary-color: #4a90e2;
    --secondary-color: #5E5CE6;
    --border-color: #38383A;
    --card-bg: #2c2c2e;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --hover-bg: #3a3a3c;
    --category-bg: rgba(44, 44, 46, 0.9);
    --card-hover-shadow: rgba(74, 144, 226, 0.3);
    --navbar-bg: linear-gradient(135deg, #2c3e50, #3498db);
    --navbar-text: #ffffff;
}

/* 左侧固定导航栏 */
.side-nav {
    position: fixed;
    left: -200px; /* 初始状态隐藏 */
    top: 50%;
    transform: translateY(-50%);
    width: 200px;
    background-color: var(--category-bg);
    backdrop-filter: blur(10px);
    border-right: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 4px 0 12px rgba(0, 0, 0, 0.1);
    padding: 1rem;
    border-radius: 0 8px 8px 0;
    transition: left 0.3s ease;
    z-index: 999;
}

.side-nav.show {
    left: 0;
}

.side-nav .category-link {
    display: block;
    padding: 0.8rem 1rem;
    margin: 0.5rem 0;
    border-radius: 4px;
    transition: all 0.3s ease;
    background: linear-gradient(135deg, 
                              rgba(74, 144, 226, 0.1) 0%,
                              rgba(74, 144, 226, 0.05) 100%);
}

.side-nav .category-link:hover {
    background: linear-gradient(135deg, 
                              var(--primary-color) 0%,
                              var(--secondary-color) 100%);
    color: #ffffff;
    transform: translateX(8px);
}

/* 顶部导航栏样式优化 */
.category-nav {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 2rem;
    padding: 1rem;
    background-color: var(--category-bg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 70px;
    z-index: 998;
    transition: opacity 0.3s ease;
}

.category-nav.hide {
    opacity: 0;
    pointer-events: none;
}

/* 导航链接样式增强 */
.category-link {
    color: var(--text-color);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.category-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.3s ease;
}

.category-link:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

.category-link.active {
    background: linear-gradient(135deg, 
                              rgba(74, 144, 226, 0.15) 0%,
                              rgba(74, 144, 226, 0.1) 100%);
    font-weight: 600;
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.category-link.active::after {
    transform: scaleX(1);
    background: linear-gradient(90deg, 
                              var(--primary-color) 0%,
                              var(--secondary-color) 100%);
    opacity: 1;
}

/* 导航栏样式 */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: var(--navbar-bg);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-logo a {
    color: var(--navbar-text);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.2rem;
}

.nav-logo a:hover {
    color: var(--primary-color);
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* 搜索框样式优化 */
.search-box {
    position: relative;
    width: 300px;
    transition: all 0.3s ease;
}

.search-box.focused {
    width: 320px;
}

.search-box input {
    width: 100%;
    padding: 0.8rem 2rem 0.8rem 1rem;
    border: none;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    color: var(--navbar-text);
    font-size: 0.9rem;
    border-radius: 50px;
    transition: all 0.3s ease;
}

.search-box input::placeholder {
    color: rgba(255, 255, 255, 0.7);
    transition: opacity 0.3s ease;
}

.search-box.focused input::placeholder {
    opacity: 0.5;
}

.search-box input:focus {
    background: rgba(255, 255, 255, 0.25);
    outline: none;
    box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.2);
}

.search-box i {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--navbar-text);
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.search-box.focused i {
    opacity: 1;
}

/* 主题切换按钮样式 */
.theme-switch {
    position: relative;
    width: 48px;
    height: 24px;
}

.theme-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.theme-switch label {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--border-color);
    border-radius: 24px;
    transition: 0.4s;
}

.theme-switch label i {
    position: absolute;
    top: 4px;
    font-size: 16px;
    transition: 0.4s;
}

.theme-switch label .fa-sun {
    left: 4px;
    color: #FFD700;
}

.theme-switch label .fa-moon {
    right: 4px;
    color: #C4C4C4;
}

.theme-switch input:checked + label {
    background-color: var(--primary-color);
}

/* 主要内容区域样式 */
.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

/* 导航分类区域样式 */
.nav-section {
    margin-bottom: 3rem;
}

.nav-section h2 {
    color: var(--text-color);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

/* 网站卡片网格布局 */
.site-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1rem;
}

/* 网站卡片样式 */
.site-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1),
                0 1px 3px rgba(0, 0, 0, 0.08);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.site-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, 
                              rgba(74, 144, 226, 0.1) 0%,
                              rgba(74, 144, 226, 0) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.site-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 12px 20px var(--card-hover-shadow),
                0 4px 8px rgba(0, 0, 0, 0.1);
}

.site-card:hover::before {
    opacity: 1;
}

.site-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-color);
    position: relative;
}

.site-card p {
    color: var(--text-color);
    opacity: 0.8;
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
    flex-grow: 1;
    line-height: 1.4;
}

/* 链接样式优化 */
.site-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.3rem;
    color: #ffffff;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.85rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 0.4rem 0.6rem;
    border-radius: 4px;
    background: linear-gradient(135deg, 
                              var(--primary-color) 0%,
                              var(--secondary-color) 100%);
    letter-spacing: 0.3px;
    position: relative;
    overflow: hidden;
    border: none;
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    width: fit-content;
    margin-top: 0.4rem;
}

.site-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, 
                              var(--secondary-color) 0%,
                              var(--primary-color) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 0;
}

.site-link i {
    position: relative;
    z-index: 1;
    font-size: 0.9em;
    transition: transform 0.3s ease;
}

.site-link span {
    position: relative;
    z-index: 1;
}

.site-link:hover {
    color: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.site-link:hover::before {
    opacity: 1;
}

.site-link:hover i {
    transform: translateX(3px);
}

.site-link:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* 页脚样式 */
footer {
    text-align: center;
    padding: 2rem;
    background-color: var(--card-bg);
    border-top: 1px solid var(--border-color);
}

footer p {
    color: var(--text-color);
    font-size: 0.9rem;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
    margin-left: 1rem;
}

footer a:hover {
    text-decoration: underline;
}

/* 响应式设计优化 */
@media (max-width: 1200px) {
    .site-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }
}

@media (max-width: 768px) {
    .site-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    }
    
    .site-card {
        padding: 0.8rem;
    }
    
    .site-card h3 {
        font-size: 0.95rem;
    }
    
    .site-card p {
        font-size: 0.8rem;
    }
    
    .navbar {
        padding: 1rem;
        flex-direction: column;
        gap: 1rem;
    }

    .nav-right {
        width: 100%;
        justify-content: center;
    }

    .search-box {
        width: 100%;
    }

    .side-nav {
        display: none; /* 在移动设备上隐藏侧边导航 */
    }
    
    .category-nav {
        position: static;
        flex-direction: column;
        align-items: center;
    }
}

/* 网站图标样式 */
.site-icon {
    margin-bottom: 10px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.site-icon img {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.site-icon img:hover {
    transform: scale(1.1);
}

/* 默认图标样式 */
.default-icon {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #ffffff;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 12px;
    font-weight: 500;
    transition: transform 0.3s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.default-icon:hover {
    transform: scale(1.1);
}

/* 多图标容器样式 */
.multi-icons {
    display: flex;
    gap: 10px;
    justify-content: center;
}

.single-icon {
    position: relative;
}

.single-icon img,
.single-icon .default-icon {
    width: 28px;
    height: 28px;
}

.single-icon .default-icon {
    font-size: 10px;
}

/* 调整卡片内部布局 */
.site-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 20px;
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.site-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-shadow-hover);
}