/**
 * 算法可视化 - 公共样式
 * @author changyadai
 */

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

/* ==================== 主题变量 ==================== */
:root {
    /* 背景色 */
    --bg-primary: #0f0c29;
    --bg-secondary: #302b63;
    --bg-tertiary: #24243e;
    
    /* 强调色 */
    --accent-cyan: #00d9ff;
    --accent-green: #00ff88;
    --accent-pink: #ff00aa;
    --accent-purple: #a855f7;
    
    /* 文字色 */
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);
    
    /* 边框和阴影 */
    --border-subtle: rgba(255, 255, 255, 0.1);
    --border-light: rgba(255, 255, 255, 0.3);
    --glow-cyan: rgba(0, 217, 255, 0.5);
    --glow-green: rgba(0, 255, 136, 0.5);
    --glow-pink: rgba(255, 0, 170, 0.5);
    
    /* 间距 */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 40px;
    --spacing-xl: 60px;
    
    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 50px;
    
    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ==================== 全局样式 ==================== */
body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, var(--bg-tertiary) 100%);
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    color: var(--text-primary);
    overflow-x: hidden;
}

/* 确保页脚始终在底部 */
body > .container,
body > main {
    flex: 1;
}

body > .site-footer {
    flex-shrink: 0;
}

/* ==================== 容器 ==================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

.container-centered {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    text-align: center;
}

/* ==================== 标题 ==================== */
.title {
    font-size: 2.5rem;
    font-weight: 300;
    letter-spacing: 4px;
    text-shadow: 0 0 20px var(--glow-cyan);
    margin-bottom: var(--spacing-xs);
}

.subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* ==================== 按钮 ==================== */
.btn {
    padding: 14px 40px;
    font-size: 1.1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-transform: uppercase;
    letter-spacing: 2px;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-green) 100%);
    color: var(--bg-primary);
    box-shadow: 0 4px 20px var(--glow-cyan);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px var(--glow-cyan);
}

.btn-secondary {
    background: transparent;
    border: 2px solid var(--border-light);
    color: var(--text-primary);
}

.btn-secondary:hover {
    border-color: rgba(255, 255, 255, 0.6);
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 20px rgba(255, 255, 255, 0.1);
}

.btn-warning {
    background: linear-gradient(135deg, #f39c12, #e67e22);
    border: none;
    color: #fff;
}

.btn-warning:hover {
    background: linear-gradient(135deg, #e67e22, #d35400);
    box-shadow: 0 4px 20px rgba(243, 156, 18, 0.4);
}

.btn-warning.paused {
    background: linear-gradient(135deg, #27ae60, #2ecc71);
}

.btn-warning.paused:hover {
    background: linear-gradient(135deg, #2ecc71, #27ae60);
    box-shadow: 0 4px 20px rgba(46, 204, 113, 0.4);
}

.btn:active {
    transform: translateY(-1px);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* ==================== 卡片 ==================== */
.card {
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-subtle);
    padding: var(--spacing-md);
    transition: all var(--transition-normal);
}

.card:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: var(--border-light);
    transform: translateY(-5px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.card-title {
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.card-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ==================== 控制栏 ==================== */
.controls {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    flex-wrap: wrap;
}

/* ==================== 状态信息 ==================== */
.info {
    margin-top: var(--spacing-md);
    color: var(--text-secondary);
}

.status-badge {
    display: inline-block;
    padding: 10px 25px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-subtle);
}

/* ==================== 背景装饰 ==================== */
.bg-decoration::before,
.bg-decoration::after {
    content: '';
    position: fixed;
    border-radius: 50%;
    pointer-events: none;
    z-index: -1;
}

.bg-decoration::before {
    width: 400px;
    height: 400px;
    top: -100px;
    right: -100px;
    background: radial-gradient(circle, rgba(0, 255, 255, 0.1) 0%, transparent 70%);
}

.bg-decoration::after {
    width: 300px;
    height: 300px;
    bottom: -50px;
    left: -50px;
    background: radial-gradient(circle, rgba(255, 0, 170, 0.1) 0%, transparent 70%);
}

/* ==================== 面包屑导航 ==================== */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: var(--spacing-sm) 0;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
}

.breadcrumb a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.breadcrumb a:hover {
    color: var(--accent-cyan);
}

.breadcrumb .separator {
    color: var(--text-muted);
    opacity: 0.5;
    font-size: 0.8rem;
}

.breadcrumb .current {
    color: var(--text-primary);
    font-weight: 500;
}

/* ==================== 导航链接（兼容旧代码） ==================== */
.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.nav-link:hover {
    color: var(--accent-cyan);
}

.nav-link::before {
    content: '←';
}

/* ==================== 网格布局 ==================== */
.grid {
    display: grid;
    gap: var(--spacing-md);
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 768px) {
    .grid-2,
    .grid-3 {
        grid-template-columns: 1fr;
    }
    
    .title {
        font-size: 1.8rem;
    }
    
    .btn {
        padding: 12px 30px;
        font-size: 1rem;
    }
}

/* ==================== 动画工具类 ==================== */
.fade-in {
    animation: fadeIn 0.5s ease forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.pulse {
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

/* ==================== 算法说明区域 ==================== */
.algo-intro {
    max-width: 800px;
    margin: 0 auto var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-subtle);
    text-align: left;
}

.algo-intro p {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 1rem;
}

/* ==================== Tab面板 ==================== */
.tabs-container {
    max-width: 900px;
    width: 100%;
    margin: var(--spacing-lg) auto 0;
    text-align: left;
    overflow: hidden;
}

.tabs-header {
    display: flex;
    gap: var(--spacing-xs);
    border-bottom: 1px solid var(--border-subtle);
    margin-bottom: var(--spacing-md);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
}

/* 移动端 Tab 按钮样式 */
@media (max-width: 480px) {
    .tabs-header {
        gap: 0;
        padding-bottom: 2px;
    }
    
    .tab-btn {
        padding: 8px 10px;
        font-size: 0.8rem;
        flex-shrink: 0;
        white-space: nowrap;
    }
}

.tab-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.95rem;
    transition: all var(--transition-fast);
    position: relative;
    display: flex;
    align-items: center;
    gap: 8px;
}

.tab-btn::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 2px;
    background: transparent;
    transition: background var(--transition-fast);
}

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

.tab-btn.active {
    color: var(--accent-cyan);
}

.tab-btn.active::after {
    background: var(--accent-cyan);
}

.tab-content {
    display: none;
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.02);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-subtle);
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

.tab-content h4 {
    color: var(--accent-cyan);
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.tab-content p,
.tab-content li {
    color: var(--text-secondary);
    line-height: 1.8;
}

.tab-content ul,
.tab-content ol {
    padding-left: var(--spacing-md);
    margin: var(--spacing-sm) 0;
}

.tab-content li {
    margin-bottom: var(--spacing-xs);
}

/* ==================== 代码实现展示 ==================== */
.pseudocode {
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-sm);
    padding: var(--spacing-md);
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    overflow-x: auto;
    color: var(--text-secondary);
}

.pseudocode .keyword {
    color: var(--accent-pink);
}

.pseudocode .function {
    color: var(--accent-cyan);
}

.pseudocode .comment {
    color: var(--text-muted);
    font-style: italic;
}

/* ==================== 复杂度表格 ==================== */
.complexity-table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-sm) 0;
}

.complexity-table th,
.complexity-table td {
    padding: var(--spacing-sm);
    text-align: left;
    border-bottom: 1px solid var(--border-subtle);
}

.complexity-table th {
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.9rem;
}

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

.complexity-table .highlight {
    color: var(--accent-green);
    font-weight: 500;
}

/* ==================== 应用场景标签 ==================== */
.use-cases {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
}

.use-case-tag {
    padding: 6px 14px;
    background: rgba(0, 217, 255, 0.1);
    border: 1px solid rgba(0, 217, 255, 0.3);
    border-radius: var(--radius-full);
    color: var(--accent-cyan);
    font-size: 0.85rem;
}

/* ==================== 页面头部 ==================== */
.page-header {
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.page-header .nav-link {
    margin-bottom: var(--spacing-md);
    display: inline-block;
}

/* ==================== 页脚 ==================== */
.site-footer {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--border-subtle);
    text-align: center;
}

.site-footer p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-xs);
}

.site-footer a {
    color: var(--accent-cyan);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

/* ==================== 特性介绍区 ==================== */
.features-section {
    max-width: 1000px;
    margin: var(--spacing-xl) auto;
    padding: 0 var(--spacing-md);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.feature-card {
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-subtle);
    padding: var(--spacing-md);
    text-align: left;
    transition: all var(--transition-normal);
}

.feature-card:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--border-light);
    transform: translateY(-3px);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.feature-title {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.feature-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ==================== 快速开始 ==================== */
.quickstart {
    max-width: 800px;
    margin: var(--spacing-xl) auto;
    text-align: center;
}

.quickstart h2 {
    font-size: 1.8rem;
    font-weight: 400;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.quickstart-steps {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.quickstart-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.step-number {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-green));
    color: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1.1rem;
}

.step-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ==================== 代码语言切换 ==================== */
.code-lang-tabs {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
}

.code-lang-btn {
    padding: 6px 16px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.85rem;
    font-family: 'Fira Code', 'Consolas', monospace;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 6px;
}

.code-lang-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-secondary);
}

.code-lang-btn.active {
    background: rgba(0, 217, 255, 0.15);
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
}

.code-lang-btn .lang-icon {
    font-size: 1rem;
}

.code-block {
    display: none;
}

.code-block.active {
    display: block;
}

/* ==================== 增强代码块样式 ==================== */
.code-container {
    position: relative;
}

.code-container .copy-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 4px 10px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.75rem;
    transition: all var(--transition-fast);
    opacity: 0;
}

.code-container:hover .copy-btn {
    opacity: 1;
}

.code-container .copy-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    color: var(--text-primary);
}

.code-container .copy-btn.copied {
    background: rgba(0, 255, 136, 0.2);
    border-color: var(--accent-green);
    color: var(--accent-green);
}

pre.code {
    background: rgba(0, 0, 0, 0.4);
    border-radius: var(--radius-sm);
    padding: var(--spacing-md);
    font-family: 'Fira Code', 'Consolas', 'Monaco', monospace;
    font-size: 0.85rem;
    line-height: 1.6;
    overflow-x: auto;
    color: var(--text-secondary);
    margin: 0;
}

/* 语法高亮 */
pre.code .keyword {
    color: #ff79c6;
}

pre.code .type {
    color: #8be9fd;
}

pre.code .function {
    color: #50fa7b;
}

pre.code .string {
    color: #f1fa8c;
}

pre.code .number {
    color: #bd93f9;
}

pre.code .comment {
    color: #6272a4;
    font-style: italic;
}

pre.code .operator {
    color: #ff79c6;
}

pre.code .annotation {
    color: #ffb86c;
}

/* ==================== 语言切换器 ==================== */
.lang-switcher {
    position: fixed;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 4px;
    background: rgba(0, 0, 0, 0.6);
    padding: 4px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-subtle);
    backdrop-filter: blur(10px);
    z-index: 1000;
}

.lang-btn {
    padding: 6px 12px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.lang-btn:hover {
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.1);
}

.lang-btn.active {
    background: var(--accent-cyan);
    color: var(--bg-primary);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .lang-switcher {
        top: 10px;
        right: 10px;
    }
    
    .lang-btn {
        padding: 4px 8px;
        font-size: 0.75rem;
    }
}

/* ========== 全站页头 ========== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: rgba(15, 12, 41, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    z-index: 1000;
}

.site-header .logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: #fff;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.site-header .logo:hover {
    color: var(--accent-cyan);
}

.site-header .header-nav {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.site-header .header-nav a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: color 0.3s ease;
}

.site-header .header-nav a:hover {
    color: #fff;
}

.site-header .header-nav svg {
    width: 20px;
    height: 20px;
}

/* 有页头时的语言切换器位置 */
.has-site-header .lang-switcher {
    position: static;
    margin-left: 1rem;
}

/* 有页头时的内容区域上边距 */
.has-site-header main,
.has-site-header .container {
    padding-top: 80px !important;
}

@media (max-width: 768px) {
    .site-header {
        padding: 0 0.75rem;
        height: 50px;
    }
    
    .site-header .logo {
        font-size: 0.9rem;
        flex-shrink: 0;
    }
    
    .site-header .header-nav {
        gap: 0.5rem;
    }
    
    .site-header .header-nav a {
        font-size: 0.8rem;
        padding: 4px 6px;
    }
    
    .site-header .header-nav a svg {
        width: 16px;
        height: 16px;
    }
    
    /* 移动端隐藏 GitHub 文字，只显示图标 */
    .site-header .header-nav .github-text {
        display: none;
    }
    
    .has-site-header main,
    .has-site-header .container {
        padding-top: 70px !important;
    }
}

/* ========== GitHub 链接 ========== */
.github-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: 1rem;
    padding: 0.5rem 1rem;
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.github-link:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.github-link svg {
    flex-shrink: 0;
}

@media (max-width: 768px) {
    .github-link {
        display: flex;
        margin-left: 0;
        margin-top: 0.75rem;
        justify-content: center;
    }
}

/* ==================== 算法页面统一布局 ==================== */
.algo-page .container {
    text-align: center;
}

.algo-page .breadcrumb {
    text-align: left;
    justify-content: flex-start;
}

.algo-page .page-header {
    text-align: center;
}

.algo-page .algo-intro {
    text-align: left;
}

.algo-page .tabs-content {
    text-align: left;
}