/* 主内容区布局 */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    padding: var(--spacing-lg);
    background-color: var(--bg-primary);
}

/* 内容容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* 头部搜索区域 */
.header {
    position: fixed;
    top: 0;
    left: var(--sidebar-width);
    right: 0;
    height: var(--header-height);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--bg-muted);
    z-index: 5;
    padding: var(--spacing-sm) var(--spacing-lg);
}

.search-box {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
}

.search-box input {
    width: 100%;
    height: 44px;
    padding: 0 var(--spacing-xl);
    padding-left: 3rem;
    border: 1px solid var(--bg-muted);
    border-radius: var(--border-radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: var(--focus-ring);
    background: var(--bg-primary);
}

.search-box input::placeholder {
    color: var(--text-secondary);
}

.search-button {
    position: absolute;
    left: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-secondary);
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    cursor: pointer;
    transition: color var(--transition-fast);
    border-radius: var(--border-radius-sm);
}

.search-button:hover {
    color: var(--primary-color);
}

.search-button:focus {
    outline: none;
    box-shadow: var(--focus-ring);
}

/* 工具网格布局 */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-xl);
    margin: 0 auto;
    max-width: 1200px;
}

/* 工具卡片 */
.tool-card {
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
    border: 1px solid var(--bg-muted);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    transition: all var(--transition-fast);
    text-decoration: none;
    height: 100%;
}

.tool-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.tool-card .icon {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    height: 48px;
}

.tool-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.tool-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    flex-grow: 1;
}

/* 响应式布局 */
@media (max-width: 768px) {
    .header {
        left: 0;
        padding: var(--spacing-sm);
    }

    .search-box input {
        height: 40px;
        font-size: 0.95rem;
    }

    .search-button {
        width: 32px;
        height: 32px;
        font-size: 1.1rem;
    }

    .tool-card {
        padding: var(--spacing-sm);
    }

    .tool-card .icon {
        font-size: 1.75rem;
        height: 40px;
    }

    .tool-card h3 {
        font-size: 1rem;
    }

    .tool-card p {
        font-size: 0.85rem;
    }
}

@media (max-width: 480px) {
    .header {
        padding: var(--spacing-xs);
    }

    .search-box input {
        height: 36px;
        padding: 0 var(--spacing-md);
        padding-left: 2.5rem;
        font-size: 0.9rem;
    }

    .search-button {
        width: 28px;
        height: 28px;
        font-size: 1rem;
        left: var(--spacing-xs);
    }

    .tool-card {
        padding: var(--spacing-xs);
    }

    .tool-card .icon {
        font-size: 1.5rem;
        height: 36px;
    }
}

/* 页脚样式 */
.footer {
    margin-left: var(--sidebar-width);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    text-align: center;
    font-size: 0.875rem;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    :root {
        --sidebar-width: 220px;
    }

    .tools-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    }
}

@media (max-width: 768px) {
    body {
        flex-direction: column;
    }

    .sidebar {
        position: static;
        width: 100%;
        padding: var(--spacing-md);
    }

    .logo {
        margin-bottom: var(--spacing-md);
    }

    .nav-menu {
        flex-direction: row;
        overflow-x: auto;
        padding-bottom: var(--spacing-sm);
    }

    .category-btn {
        white-space: nowrap;
    }

    .main-content {
        margin-left: 0;
        padding: var(--spacing-md);
    }

    .header {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .search-box {
        margin-right: 0;
        max-width: 100%;
    }

    .tools-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }

    .footer {
        margin-left: 0;
    }

    .quick-tools {
        right: var(--spacing-sm);
        bottom: var(--spacing-lg);
    }
}

@media (max-width: 480px) {
    .main-content {
        padding: var(--spacing-sm);
    }

    .container {
        padding: 0 var(--spacing-xs);
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
        padding: var(--spacing-xs);
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tool-card {
    animation: fadeIn 0.3s ease-out;
}

/* 无结果提示 */
.no-results {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* 暗色主题额外调整 */
[data-theme="dark"] {
    --primary-color: #5c9ce6;
    --secondary-color: #a1a1a1;
    --text-primary: #e1e1e1;
    --text-secondary: #b1b1b1;
    --text-muted: #888888;
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-muted: #333333;
    --hover-color: #4a90e2;
}

[data-theme="dark"] .tool-card::before {
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.05));
}

[data-theme="dark"] .search-box input {
    background-color: var(--bg-muted);
}

[data-theme="dark"] .quick-tool-btn {
    background: var(--primary-color);
}

[data-theme="dark"] .quick-tool-btn:hover {
    background: var(--hover-color);
}

/* 错误模态框 */
.modal {
    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;
}

.modal[hidden] {
    display: none;
}

.modal-content {
    background-color: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    max-width: 90%;
    width: 400px;
}

.modal-content h2 {
    color: var(--error-color);
    margin-bottom: var(--spacing-md);
    font-size: 1.25rem;
}

.modal-content p {
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
}

.modal-content button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.modal-content button:hover {
    background-color: var(--hover-color);
}

.modal-content button:focus {
    outline: none;
    box-shadow: var(--focus-ring);
}

/* 暗色主题支持 */
[data-theme="dark"] .modal-content {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

/* 可访问性样式 */
.modal-content {
    role: dialog;
    aria-modal: true;
    aria-label: "错误提示";
}

/* 搜索建议 */
.search-suggestions {
    position: absolute;
    top: calc(100% + var(--spacing-xs));
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border: 1px solid var(--bg-muted);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-md);
    z-index: 1000;
    max-height: 300px;
    overflow-y: auto;
    display: none;
}

.search-suggestions.active {
    display: block;
}

.search-suggestion {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.search-suggestion:hover {
    background: var(--bg-secondary);
}

.search-suggestion i {
    font-size: 1.25rem;
    color: var(--primary-color);
    flex-shrink: 0;
}

.search-suggestion > div {
    flex: 1;
    min-width: 0;
}

.suggestion-title {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.suggestion-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .search-suggestion {
        padding: var(--spacing-xs) var(--spacing-sm);
        gap: var(--spacing-sm);
    }

    .search-suggestion i {
        font-size: 1.1rem;
    }

    .suggestion-title {
        font-size: 0.9rem;
    }

    .suggestion-desc {
        font-size: 0.8rem;
    }
}

/* 减少动画 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* CSS变量和主题 */
:root {
    /* 颜色 */
    --primary-color: #4a90e2;
    --secondary-color: #2c3e50;
    --text-primary: #2c3e50;
    --text-secondary: #34495e;
    --text-muted: #7f8c8d;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-muted: #ecf0f1;
    
    /* 间距 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* 圆角 */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    
    /* 阴影 */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    
    /* 动画 */
    --transition-fast: 0.15s ease;
    
    /* 布局 */
    --sidebar-width: 220px;
}

/* 暗色主题 */
[data-theme="dark"] {
    --primary-color: #5c9ce6;
    --secondary-color: #a1a1a1;
    --text-primary: #e1e1e1;
    --text-secondary: #b1b1b1;
    --text-muted: #888888;
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-muted: #333333;
}

/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    display: flex;
    min-height: 100vh;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
}

/* 主布局 */
.sidebar {
    width: var(--sidebar-width);
    height: 100vh;
    position: fixed;
    left: 0;
    top: 0;
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--bg-muted);
    padding: var(--spacing-md);
    overflow-y: auto;
    z-index: 100;
    display: flex;
    flex-direction: column;
}

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    padding: var(--spacing-md);
    background-color: var(--bg-primary);
}

/* 工具网格 */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
}

/* 工具卡片 */
.tool-card {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-fast);
    cursor: pointer;
    text-decoration: none;
    color: inherit;
}

.tool-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.tool-icon {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    border-radius: var(--border-radius-sm);
    color: var(--primary-color);
    font-size: 1.2rem;
}

.tool-info {
    flex: 1;
    min-width: 0;
}

.tool-title {
    margin: 0;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
}

.tool-description {
    margin: 0;
    font-size: 0.8rem;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* 响应式布局 */
@media (max-width: 768px) {
    body {
        flex-direction: column;
    }

    .sidebar {
        position: static;
        width: 100%;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--bg-muted);
        padding: var(--spacing-sm);
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
    }

    .logo {
        padding: var(--spacing-xs);
        margin: 0 var(--spacing-md) 0 0;
        border-bottom: none;
    }

    .logo-text {
        font-size: 1.1rem;
    }

    .nav-menu {
        flex-direction: row;
        flex-wrap: wrap;
        gap: var(--spacing-xs);
        padding: 0;
        flex: 1;
    }

    .nav-button {
        width: auto;
        padding: var(--spacing-sm);
        font-size: 0.9rem;
        gap: var(--spacing-sm);
    }

    .nav-button i {
        font-size: 1.1rem;
        width: 20px;
    }
}

@media (max-width: 480px) {
    .sidebar {
        flex-direction: column;
        padding: var(--spacing-xs);
    }

    .logo {
        margin: 0 0 var(--spacing-sm) 0;
        width: 100%;
        text-align: center;
    }

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

    .nav-button {
        padding: var(--spacing-xs) var(--spacing-sm);
    }
}

/* 侧边栏基础样式 */
.sidebar {
    width: var(--sidebar-width);
    height: 100vh;
    position: fixed;
    left: 0;
    top: 0;
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--bg-muted);
    padding: var(--spacing-md);
    overflow-y: auto;
    z-index: 100;
    display: flex;
    flex-direction: column;
}

/* Logo 样式 */
.logo {
    padding: var(--spacing-md) var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    text-align: center;
    border-bottom: 1px solid var(--bg-muted);
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
    margin: 0;
}

/* 导航菜单 */
.nav-menu {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    padding: 0 var(--spacing-xs);
}

/* 导航按钮 */
.nav-button {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    width: 100%;
    text-align: left;
    cursor: pointer;
    border-radius: var(--border-radius-md);
    transition: all var(--transition-fast);
    font-size: 0.95rem;
    font-weight: 500;
}

.nav-button:hover {
    background-color: var(--bg-muted);
    color: var(--text-primary);
}

.nav-button.active {
    background-color: var(--primary-color);
    color: white;
}

.nav-button i {
    font-size: 1.25rem;
    width: 24px;
    text-align: center;
    flex-shrink: 0;
}

.nav-button span {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        border-right: none;
        border-bottom: 1px solid var(--bg-muted);
        padding: var(--spacing-sm);
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
    }

    .logo {
        padding: var(--spacing-xs);
        margin: 0 var(--spacing-md) 0 0;
        border-bottom: none;
    }

    .logo-text {
        font-size: 1.1rem;
    }

    .nav-menu {
        flex-direction: row;
        flex-wrap: wrap;
        gap: var(--spacing-xs);
        padding: 0;
        flex: 1;
    }

    .nav-button {
        width: auto;
        padding: var(--spacing-sm);
        font-size: 0.9rem;
        gap: var(--spacing-sm);
    }

    .nav-button i {
        font-size: 1.1rem;
        width: 20px;
    }
}

@media (max-width: 480px) {
    .sidebar {
        flex-direction: column;
        padding: var(--spacing-xs);
    }

    .logo {
        margin: 0 0 var(--spacing-sm) 0;
        width: 100%;
        text-align: center;
    }

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

    .nav-button {
        padding: var(--spacing-xs) var(--spacing-sm);
    }
}

/* 布局变量 */
:root {
    --header-height: 60px;
    --sidebar-width: 240px;
    --container-max-width: 1200px;
    --grid-columns: 3;
    
    /* 间距 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* 颜色 */
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-muted: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    
    /* 阴影 */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    
    /* 动画 */
    --transition-fast: 0.15s ease;
    
    /* 布局 */
    --sidebar-width: 220px;
}

/* 暗色主题 */
[data-theme="dark"] {
    --primary-color: #5c9ce6;
    --secondary-color: #a1a1a1;
    --text-primary: #e1e1e1;
    --text-secondary: #b1b1b1;
    --text-muted: #888888;
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-muted: #333333;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.5;
    color: var(--text-primary);
    background: var(--bg-secondary);
}

/* 布局 */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: var(--spacing-md);
}

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-primary);
    border-right: 1px solid var(--bg-muted);
    padding: var(--spacing-md);
    overflow-y: auto;
    z-index: 10;
    display: flex;
    flex-direction: column;
}

.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    padding-top: var(--header-height);
}

/* Logo */
.logo {
    padding: var(--spacing-md) 0;
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* 导航菜单 */
.nav-menu {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.nav-button {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: none;
    border: none;
    border-radius: var(--border-radius-md);
    color: var(--text-secondary);
    font-size: 1rem;
    text-align: left;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.nav-button:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.nav-button.active {
    background: var(--primary-color);
    color: white;
}

.nav-button i {
    font-size: 1.25rem;
}

/* 工具网格 */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(var(--grid-columns), 1fr);
    gap: var(--spacing-md);
    padding: var(--spacing-md) 0;
}

.tool-card {
    background: var(--bg-primary);
    border: 1px solid var(--bg-muted);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    transition: all var(--transition-fast);
}

.tool-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.tool-card h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.tool-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.tool-card .icon {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

/* 响应式布局 */
@media (max-width: 1024px) {
    :root {
        --grid-columns: 2;
    }
}

@media (max-width: 768px) {
    :root {
        --sidebar-width: 200px;
    }
    
    .nav-button {
        padding: var(--spacing-sm);
    }
    
    .nav-button span {
        font-size: 0.9rem;
    }
}

@media (max-width: 640px) {
    :root {
        --grid-columns: 1;
    }
    
    .sidebar {
        transform: translateX(-100%);
        transition: transform var(--transition-fast);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
}

/* 辅助类 */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}