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

:root {
    --primary-color: #6366f1;
    --secondary-color: #8b5cf6;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --dark-bg: #1e293b;
    --darker-bg: #0f172a;
    --light-bg: #f8fafc;
    --border-color: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #ffffff;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--light-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow: hidden; /* 防止整个页面滚动 */
    height: 100vh; /* 固定高度 */
}

.container {
    display: flex;
    height: 100vh;
    overflow: hidden;
    position: relative; /* 确保子元素定位正确 */
}

/* 侧边栏样式 */
.sidebar {
    width: 280px;
    background: var(--darker-bg);
    color: var(--text-light);
    overflow-y: auto; /* 侧边栏独立滚动 */
    overflow-x: hidden; /* 防止横向滚动 */
    height: 100vh; /* 固定高度为视口高度 */
    box-shadow: var(--shadow-lg);
    flex-shrink: 0; /* 防止侧边栏被压缩 */
}

.sidebar-header {
    padding: 2rem 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.sidebar-close {
    display: none;
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.3s;
}

.sidebar-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(90deg);
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 1001;
    background: var(--primary-color);
    border: none;
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 12px;
    cursor: pointer;
    font-size: 1.5rem;
    box-shadow: var(--shadow-lg);
    transition: all 0.3s;
}

.mobile-menu-btn:hover {
    background: var(--secondary-color);
    transform: scale(1.05);
}

.mobile-menu-btn:active {
    transform: scale(0.95);
}

/* 遮罩层 */
.overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    transition: opacity 0.3s;
}

.overlay.active {
    display: block;
    opacity: 1;
}

.sidebar-nav {
    padding: 1rem 0;
}

.nav-category {
    margin-bottom: 1.5rem;
}

.nav-category h3 {
    padding: 0.75rem 1.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    letter-spacing: 0.05em;
}

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

.nav-category ul li {
    padding: 0.75rem 1.5rem 0.75rem 3rem;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.8);
}

.nav-category ul li:hover {
    background: rgba(99, 102, 241, 0.2);
    color: var(--text-light);
    padding-left: 3.25rem;
}

.nav-category ul li.active {
    background: linear-gradient(90deg, var(--primary-color), transparent);
    color: var(--text-light);
    border-left: 3px solid var(--primary-color);
    font-weight: 600;
}

/* 主内容区样式 */
.main-content {
    flex: 1;
    overflow-y: auto; /* 主内容区独立滚动 */
    overflow-x: hidden; /* 防止横向滚动 */
    padding: 2rem;
    background: var(--light-bg);
    height: 100vh; /* 固定高度为视口高度 */
    position: relative; /* 确保内容定位正确 */
}

#tool-container {
    max-width: 1200px;
    margin: 0 auto;
}

/* 欢迎屏幕 */
.welcome-screen {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.welcome-screen i {
    font-size: 5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.welcome-screen h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

/* 工具卡片样式 */
.tool-card {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.tool-header {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.tool-header h2 {
    font-size: 1.75rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.tool-header p {
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

/* 表单样式 */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="number"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    transition: all 0.2s;
    font-family: inherit;
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
    font-family: 'Courier New', monospace;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* 按钮样式 */
.btn-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin: 1.5rem 0;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--text-secondary);
    color: white;
}

.btn-success {
    background: var(--success-color);
    color: white;
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* 结果区域 */
.result-area {
    margin-top: 2rem;
    padding: 1.5rem;
    background: var(--light-bg);
    border-radius: 8px;
    border: 2px solid var(--border-color);
}

.result-area.success {
    border-color: var(--success-color);
    background: rgba(16, 185, 129, 0.05);
}

.result-area.error {
    border-color: var(--danger-color);
    background: rgba(239, 68, 68, 0.05);
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.result-header h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
}

.result-content {
    padding: 1rem;
    background: white;
    border-radius: 6px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    word-break: break-all;
    white-space: pre-wrap;
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(99, 102, 241, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 提示信息 */
.alert {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.alert-info {
    background: rgba(99, 102, 241, 0.1);
    border-left: 4px solid var(--primary-color);
    color: var(--primary-color);
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    border-left: 4px solid var(--success-color);
    color: var(--success-color);
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    border-left: 4px solid var(--danger-color);
    color: var(--danger-color);
}

/* 色彩选择器特殊样式 */
.color-preview {
    width: 100%;
    height: 150px;
    border-radius: 8px;
    border: 2px solid var(--border-color);
    margin-bottom: 1rem;
}

.color-formats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.color-format-item {
    padding: 1rem;
    background: var(--light-bg);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.color-format-item label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.color-format-item .value {
    font-family: 'Courier New', monospace;
    font-weight: 600;
    color: var(--text-primary);
}

/* 二维码样式 */
.qrcode-container {
    text-align: center;
    padding: 2rem;
    background: white;
    border-radius: 8px;
}

#qrcode-output {
    display: inline-block;
    padding: 1rem;
    background: white;
    border-radius: 8px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .sidebar {
        width: 85%;
        max-width: 320px;
        position: fixed;
        left: -100%;
        top: 0;
        height: 100vh;
        transition: left 0.3s ease-in-out;
        z-index: 1000;
    }
    
    .sidebar.active {
        left: 0;
    }
    
    .sidebar-header {
        position: relative;
    }
    
    .sidebar-close {
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .main-content {
        padding: 1rem;
        padding-top: 5rem;
        width: 100%;
    }
    
    .tool-card {
        padding: 1.5rem;
    }
    
    .welcome-screen {
        padding: 2rem 1rem;
    }
    
    .welcome-screen i {
        font-size: 3rem;
    }
    
    .welcome-screen h2 {
        font-size: 1.5rem;
    }
    
    .welcome-screen p {
        font-size: 1rem;
    }
    
    .btn-group {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    /* 移动端表单优化 */
    .form-group input,
    .form-group textarea,
    .form-group select {
        font-size: 16px; /* 防止iOS自动缩放 */
    }
    
    /* 标签页优化 */
    .tabs {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .tab {
        white-space: nowrap;
        min-width: 100px;
        flex-shrink: 0;
    }
    
    /* 导航项优化 - 增大点击区域 */
    .nav-category ul li {
        padding: 1rem 1.5rem 1rem 3rem;
        font-size: 1rem;
        min-height: 48px; /* 最小触摸目标尺寸 */
        display: flex;
        align-items: center;
    }
    
    /* 工具标题优化 */
    .tool-header h2 {
        font-size: 1.5rem;
    }
    
    .tool-header p {
        font-size: 0.9rem;
    }
}

/* 小屏幕手机额外优化 */
@media (max-width: 480px) {
    .mobile-menu-btn {
        width: 45px;
        height: 45px;
        font-size: 1.3rem;
        top: 0.75rem;
        left: 0.75rem;
    }
    
    .sidebar {
        width: 90%;
    }
    
    .main-content {
        padding: 0.75rem;
        padding-top: 4.5rem;
    }
    
    .tool-card {
        padding: 1rem;
        border-radius: 8px;
    }
    
    .sidebar-header {
        padding: 1.5rem 1rem;
    }
    
    .sidebar-header h1 {
        font-size: 1.25rem;
    }
    
    .sidebar-close {
        width: 36px;
        height: 36px;
        top: 1.25rem;
        right: 1rem;
    }
    
    .welcome-screen {
        padding: 1.5rem 0.75rem;
    }
    
    .welcome-screen i {
        font-size: 2.5rem;
    }
    
    .welcome-screen h2 {
        font-size: 1.25rem;
    }
    
    .nav-category h3 {
        font-size: 0.8rem;
        padding: 0.5rem 1rem;
    }
    
    /* 按钮优化 */
    .btn {
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
    }
    
    /* 结果区域优化 */
    .result-area {
        font-size: 0.875rem;
    }
    
    .result-content {
        max-height: 250px;
    }
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--light-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* 复制按钮 */
.copy-btn {
    padding: 0.5rem 1rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s;
}

.copy-btn:hover {
    background: var(--secondary-color);
}

.copy-btn.copied {
    background: var(--success-color);
}

/* 选项卡样式 */
.tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
}

.tab {
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    border: none;
    background: none;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all 0.2s;
}

.tab:hover {
    color: var(--text-primary);
}

.tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* 工具栏 */
.toolbar {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.toolbar-btn {
    padding: 0.5rem 1rem;
    background: var(--light-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s;
}

.toolbar-btn:hover {
    background: var(--border-color);
}

/* 网格布局 */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

@media (max-width: 768px) {
    .grid-2 {
        grid-template-columns: 1fr;
    }
}