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

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

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

.container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* 登录模态框 */
.login-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.login-modal {
    background-color: var(--background-light);
    padding: 32px;
    border-radius: var(--border-radius);
    width: 400px;
    max-width: 90%;
    box-shadow: var(--shadow);
}

.login-modal h2 {
    margin-bottom: 24px;
    text-align: center;
}

.login-modal form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.login-modal input {
    padding: 12px 16px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 16px;
}

.login-modal button {
    padding: 12px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 500;
}

/* 用户头像 */
.user-avatar {
    display: flex;
    align-items: center;
    gap: 8px;
}

.user-avatar img {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

/* 顶部导航栏 */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 32px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.logo {
    font-size: 24px;
    font-weight: 700;
}

.search-bar {
    display: flex;
    width: 40%;
}

.search-bar input {
    width: 100%;
    padding: 12px 16px;
    border: none;
    border-radius: var(--border-radius) 0 0 var(--border-radius);
    font-size: 16px;
}

.search-bar button {
    padding: 0 16px;
    border: none;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    background-color: var(--background-light);
    cursor: pointer;
}

.header-actions {
    display: flex;
    gap: 16px;
}

.header-actions button {
    background: none;
    border: none;
    color: white;
    font-size: 16px;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.header-actions button:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

/* 主内容区布局 */
.main-content {
    display: flex;
    flex: 1;
}

/* 左侧分类导航 */
.sidebar {
    width: 240px;
    background-color: var(--background-light);
    padding: 24px 0;
    box-shadow: var(--shadow);
}

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

.category-menu li {
    padding: 12px 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    transition: var(--transition);
}

.category-menu li:hover {
    background-color: var(--background-gray);
}

.category-menu li.active {
    background-color: rgba(91, 106, 255, 0.1);
    color: var(--primary-color);
    border-left: 4px solid var(--primary-color);
}

/* 主内容区 */
.content-area {
    flex: 1;
    padding: 32px;
}

.category-description {
    color: var(--text-medium);
    margin-bottom: 24px;
}

/* 工具卡片网格 */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.tool-card {
    background-color: var(--background-light);
    border-radius: var(--border-radius);
    padding: 24px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.12);
}

.tool-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 16px;
    color: white;
    font-size: 24px;
}

.tool-card h3 {
    margin-bottom: 8px;
    font-size: 18px;
}

.tool-card p {
    color: var(--text-medium);
    margin-bottom: 16px;
    font-size: 14px;
}

.use-button {
    padding: 10px 24px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.use-button:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .sidebar {
        width: 200px;
    }
}

@media (max-width: 768px) {
    .main-content {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        padding: 16px 0;
    }
    
    .category-menu ul {
        display: flex;
        overflow-x: auto;
        padding: 0 16px;
    }
    
    .category-menu li {
        white-space: nowrap;
        border-left: none;
        border-bottom: 4px solid transparent;
    }
    
    .category-menu li.active {
        border-left: none;
        border-bottom: 4px solid var(--primary-color);
    }
    
    .header {
        flex-direction: column;
        gap: 16px;
        padding: 16px;
    }
    
    .search-bar {
        width: 100%;
    }
}

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