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

/* 全局变量 - 主题颜色 */
:root {
    --primary-color: #5B6AFF;
    --secondary-color: #8C54FF;
    --bg-light: #FFFFFF;
    --bg-gray: #F5F7FA;
    --text-dark: #333333;
    --text-gray: #666666;
    --shadow: 0 4px 12px rgba(0,0,0,0.08);
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

/* 深色模式变量 */
[data-theme="dark"] {
    --primary-color: #6B7AFF;
    --secondary-color: #9C64FF;
    --bg-light: #1E2022;
    --bg-gray: #2D3035;
    --text-dark: #FFFFFF;
    --text-gray: #CCCCCC;
    --shadow: 0 4px 12px rgba(0,0,0,0.2);
}

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

/* 顶部导航栏 */
.top-nav {
    background-color: var(--bg-light);
    box-shadow: var(--shadow);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: var(--transition);
}

.top-nav .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    max-width: 1400px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    cursor: pointer;
    transition: var(--transition);
}

.logo i {
    margin-right: 8px;
}

/* 搜索框 */
.search-container {
    flex: 1;
    max-width: 400px;
    margin: 0 32px;
    position: relative;
}

#search-input {
    width: 100%;
    padding: 10px 40px 10px 16px;
    border: 2px solid #E1E5E9;
    border-radius: 24px;
    background-color: var(--bg-gray);
    color: var(--text-dark);
    font-size: 14px;
    transition: var(--transition);
}

#search-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.search-btn {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-gray);
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: var(--transition);
}

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

/* 导航右侧按钮 */
.nav-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: none;
    border: 1px solid #E1E5E9;
    border-radius: 20px;
    color: var(--text-dark);
    cursor: pointer;
    transition: var(--transition);
    font-size: 14px;
}

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

.user-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--primary-color);
    border: none;
    color: white;
    font-size: 18px;
    cursor: pointer;
    transition: var(--transition);
}

.user-btn:hover {
    transform: scale(1.1);
}

/* 主容器布局 */
.main-container {
    display: flex;
    margin-top: 80px;
    min-height: calc(100vh - 80px);
}

/* 左侧分类导航 */
.sidebar {
    width: 240px;
    background-color: var(--bg-light);
    box-shadow: var(--shadow);
    position: fixed;
    left: 0;
    top: 80px;
    bottom: 0;
    overflow-y: auto;
    transition: var(--transition);
}

.category-nav {
    padding: 24px;
}

.nav-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-gray);
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.category-nav ul {
    list-style: none;
}

.category-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    margin-bottom: 8px;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-size: 14px;
    color: var(--text-dark);
}

.category-item:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateX(4px);
}

.category-item.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    font-weight: 500;
}

.category-item i {
    font-size: 18px;
    width: 24px;
    text-align: center;
}

/* 主内容区 */
.content {
    flex: 1;
    margin-left: 240px;
    padding: 32px;
    max-width: calc(100% - 240px);
    transition: var(--transition);
}

/* 分类标题 */
.category-header {
    margin-bottom: 32px;
}

.category-header h1 {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.category-header p {
    font-size: 16px;
    color: var(--text-gray);
}

/* 工具卡片网格 */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

/* 工具卡片 */
.tool-card {
    background-color: var(--bg-light);
    border-radius: var(--border-radius);
    padding: 24px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
    display: flex;
    flex-direction: column;
}

.tool-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(91, 106, 255, 0.15);
}

.card-icon {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 24px;
    margin-bottom: 16px;
}

.card-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.card-description {
    font-size: 14px;
    color: var(--text-gray);
    margin-bottom: 24px;
    flex: 1;
}

.use-btn {
    padding: 12px 24px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border: none;
    border-radius: 24px;
    color: white;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.use-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(91, 106, 255, 0.3);
}

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
}

.page-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid #E1E5E9;
    background-color: var(--bg-light);
    color: var(--text-dark);
    cursor: pointer;
    transition: var(--transition);
}

.page-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.page-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-color: var(--primary-color);
    color: white;
}

/* 响应式设计 - 平板设备 */
@media (max-width: 1024px) {
    .sidebar {
        width: 200px;
    }
    
    .content {
        margin-left: 200px;
        max-width: calc(100% - 200px);
    }
    
    .tools-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
}

/* 响应式设计 - 移动设备 */
@media (max-width: 768px) {
    .top-nav .container {
        flex-wrap: wrap;
        gap: 16px;
    }
    
    .search-container {
        order: 3;
        width: 100%;
        margin: 0;
    }
    
    .sidebar {
        display: none;
    }
    
    .content {
        margin-left: 0;
        max-width: 100%;
        padding: 24px;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
    }
    
    .category-header h1 {
        font-size: 24px;
    }
}

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

.tool-card {
    animation: fadeIn 0.5s ease-out;
}

.tool-card:nth-child(2) {
    animation-delay: 0.1s;
}

.tool-card:nth-child(3) {
    animation-delay: 0.2s;
}

.tool-card:nth-child(4) {
    animation-delay: 0.3s;
}

.tool-card:nth-child(5) {
    animation-delay: 0.4s;
}

.tool-card:nth-child(6) {
    animation-delay: 0.5s;
}