/* 全局样式 - 程序员风格，简洁实用 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 单色配色方案 - 无渐变 */
    --text-primary: #1a1a1a;
    --text-secondary: #4a4a4a;
    --text-muted: #6b7280;
    --border-color: #d1d5db;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-code: #f3f4f6;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --success: #059669;
    --error: #dc2626;
    
    /* 等宽字体 */
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', 'Monaco', 'Courier New', monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    
    /* 简洁边框 */
    --border: 1px solid var(--border-color);
    --border-radius: 4px;
}

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    font-size: 15px;
}

/* 导航栏 - 简洁线条 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-bottom: var(--border);
    z-index: 1000;
    padding: 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
}

.nav-brand {
    display: flex;
    align-items: center;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
    font-family: var(--font-mono);
}

.nav-links {
    display: flex;
    gap: 24px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--accent);
}

/* 移动端菜单按钮 */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s;
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* 主内容区域 */
.main-content {
    margin-top: 60px;
}

/* 工具区域 - 简洁卡片 */
.tool-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
}

.tool-header {
    margin-bottom: 30px;
}

.tool-header h1 {
    font-size: 28px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    font-family: var(--font-mono);
}

.tool-header p {
    color: var(--text-secondary);
    font-size: 15px;
}

/* UUID 生成卡片 */
.uuid-card {
    background: var(--bg-primary);
    border: var(--border);
    border-radius: var(--border-radius);
    padding: 24px;
    margin-bottom: 30px;
}

.uuid-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: var(--border);
}

.uuid-header h2 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.uuid-actions {
    display: flex;
    gap: 8px;
}

.action-btn {
    width: 36px;
    height: 36px;
    border: var(--border);
    background: var(--bg-primary);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    font-size: 14px;
}

.action-btn:hover {
    background: var(--bg-secondary);
    border-color: var(--accent);
    color: var(--accent);
}

.uuid-content {
    background: var(--bg-code);
    border: var(--border);
    border-radius: var(--border-radius);
    padding: 16px;
    margin-bottom: 16px;
}

.uuid-value {
    font-family: var(--font-mono);
    font-size: 16px;
    color: var(--text-primary);
    word-break: break-all;
    user-select: all;
    cursor: pointer;
    line-height: 1.6;
    padding: 12px;
    background: var(--bg-primary);
    border: var(--border);
    border-radius: var(--border-radius);
}

.uuid-value:hover {
    border-color: var(--accent);
}

.uuid-info {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 12px;
}

/* 按钮 - 简洁样式 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 500;
    border: var(--border);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    background: var(--bg-primary);
    color: var(--text-primary);
}

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

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

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

.btn-secondary:hover {
    background: var(--bg-secondary);
    border-color: var(--accent);
}

/* 批量生成区域 */
.batch-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px 40px;
}

.batch-controls {
    background: var(--bg-primary);
    border: var(--border);
    border-radius: var(--border-radius);
    padding: 20px;
    margin-bottom: 20px;
}

.input-group {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.input-group label {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 14px;
}

.form-input {
    padding: 8px 12px;
    border: var(--border);
    border-radius: var(--border-radius);
    font-size: 14px;
    width: 100px;
    font-family: var(--font-mono);
}

.form-input:focus {
    outline: none;
    border-color: var(--accent);
}

.batch-results {
    display: grid;
    gap: 8px;
}

.uuid-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg-primary);
    padding: 12px 16px;
    border: var(--border);
    border-radius: var(--border-radius);
    transition: all 0.2s;
}

.uuid-item:hover {
    border-color: var(--accent);
}

.uuid-text {
    font-family: var(--font-mono);
    color: var(--text-primary);
    user-select: all;
    cursor: pointer;
    font-size: 14px;
    flex: 1;
}

.copy-uuid-btn {
    background: none;
    border: var(--border);
    color: var(--text-secondary);
    cursor: pointer;
    padding: 6px 12px;
    border-radius: var(--border-radius);
    transition: all 0.2s;
    font-size: 13px;
}

.copy-uuid-btn:hover {
    color: var(--accent);
    border-color: var(--accent);
}

/* 内容区域 */
.content-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
    background: var(--bg-secondary);
}

.content-card {
    background: var(--bg-primary);
    border: var(--border);
    border-radius: var(--border-radius);
    padding: 30px;
    margin-bottom: 30px;
}

.content-card h2 {
    font-size: 22px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: var(--border);
}

.content-card h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: 24px;
    margin-bottom: 12px;
}

.content-card p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 16px;
}

.content-card ul,
.content-card ol {
    margin-left: 24px;
    margin-bottom: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.content-card li {
    margin-bottom: 8px;
}

/* 代码块 */
.code-block {
    background: var(--bg-code);
    border: var(--border);
    border-radius: var(--border-radius);
    padding: 16px;
    margin: 16px 0;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.6;
}

.code-block code {
    color: var(--text-primary);
}

/* 表格 */
.content-table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    font-size: 14px;
}

.content-table th,
.content-table td {
    padding: 10px 12px;
    text-align: left;
    border: var(--border);
}

.content-table th {
    background: var(--bg-secondary);
    font-weight: 600;
    color: var(--text-primary);
}

.content-table td {
    color: var(--text-secondary);
}

/* 页脚 */
.footer {
    background: var(--bg-primary);
    border-top: var(--border);
    padding: 30px 20px;
    margin-top: 60px;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: var(--border);
}

.footer-brand {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    font-family: var(--font-mono);
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--accent);
}

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
    color: var(--text-muted);
    font-size: 13px;
}

.footer-friends {
    margin-top: 20px;
    padding-top: 20px;
    border-top: var(--border);
}

.footer-friends h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.friends-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.friends-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

.friends-links a:hover {
    color: var(--accent);
}

/* 通知提示 */
.notification {
    position: fixed;
    top: 70px;
    right: 20px;
    background: var(--success);
    color: white;
    padding: 12px 20px;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    gap: 8px;
    transform: translateX(120%);
    opacity: 0;
    transition: all 0.3s;
    z-index: 1001;
    font-size: 14px;
}

.notification.show {
    transform: translateX(0);
    opacity: 1;
}

.notification.error {
    background: var(--error);
}

/* 批量生成额外样式 */
.batch-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: var(--border);
}

.batch-header h3 {
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 600;
}

.batch-actions {
    display: flex;
    gap: 8px;
}

.batch-progress {
    text-align: center;
    padding: 20px;
}

.progress-bar {
    width: 100%;
    height: 4px;
    background: var(--bg-secondary);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 12px;
}

.progress-fill {
    height: 100%;
    background: var(--accent);
    transition: width 0.3s;
}

.progress-text {
    color: var(--text-secondary);
    font-size: 13px;
}

.uuid-list {
    max-height: 500px;
    overflow-y: auto;
}

.uuid-index {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: var(--border);
    border-radius: 2px;
    font-size: 12px;
    font-weight: 600;
    margin-right: 12px;
    font-family: var(--font-mono);
}

.loading-indicator {
    text-align: center;
    padding: 20px;
    color: var(--text-muted);
    font-size: 14px;
}

.error-message {
    text-align: center;
    padding: 20px;
    color: var(--error);
    background: var(--bg-secondary);
    border: var(--border);
    border-radius: var(--border-radius);
    border-color: var(--error);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-container {
        position: relative;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-links {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        border-bottom: var(--border);
        flex-direction: column;
        padding: 20px;
        gap: 16px;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s;
        z-index: 1000;
    }
    
    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-links a {
        padding: 12px;
        border-bottom: var(--border);
    }
    
    .nav-links a:last-child {
        border-bottom: none;
    }
    
    .tool-section {
        padding: 30px 16px;
    }
    
    .uuid-card {
        padding: 20px;
    }
    
    .content-card {
        padding: 20px;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
    
    .notification {
        right: 16px;
        left: 16px;
    }
    
    .input-group {
        flex-direction: column;
        align-items: stretch;
    }
    
    .form-input {
        width: 100%;
    }
}

/* 简洁动画 */
.fade-in {
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.loading {
    position: relative;
    color: var(--text-muted);
}

.loading::after {
    content: '...';
    animation: dots 1.5s steps(4, end) infinite;
}

@keyframes dots {
    0%, 20% {
        content: '.';
    }
    40% {
        content: '..';
    }
    60%, 100% {
        content: '...';
    }
}