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

:root {
    --primary-color: #6366f1;
    --secondary-color: #8b5cf6;
    --accent-color: #06b6d4;
    --text-color: #1e293b;
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --border-color: #334155;
    --gradient-primary: linear-gradient(135deg, #6366f1, #8b5cf6);
    --gradient-secondary: linear-gradient(135deg, #06b6d4, #10b981);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background: var(--bg-color);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
.navbar {
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: #e2e8f0;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width 0.3s ease;
}

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

.nav-links a:hover::after {
    width: 100%;
}

/* 英雄区域 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: radial-gradient(circle at center, rgba(99, 102, 241, 0.15), transparent 70%);
    padding-top: 80px;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 1s ease;
}

.hero p {
    font-size: 1.25rem;
    color: #94a3b8;
    margin-bottom: 2rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 1.2s ease;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    animation: fadeInUp 1.4s ease;
}

.btn {
    padding: 0.75rem 2rem;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-block;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.6);
}

.btn-secondary {
    background: transparent;
    color: #e2e8f0;
    border: 2px solid var(--primary-color);
}

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

/* 通用部分样式 */
.section {
    padding: 5rem 0;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 核心技术卡片 */
.technologies {
    background: linear-gradient(180deg, transparent, rgba(15, 23, 42, 0.8), transparent);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.tech-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.tech-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.tech-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 40px rgba(99, 102, 241, 0.2);
    border-color: var(--primary-color);
}

.tech-card:hover::before {
    opacity: 1;
}

.tech-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.tech-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #f1f5f9;
}

.tech-card p {
    color: #94a3b8;
    margin-bottom: 1rem;
}

.tech-features {
    list-style: none;
    padding-left: 0;
}

.tech-features li {
    color: #cbd5e1;
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.tech-features li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* 学习路径 */
.learning-path {
    background: linear-gradient(180deg, transparent, rgba(6, 182, 212, 0.05), transparent);
}

.path-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.path-level {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    transition: all 0.3s ease;
}

.path-level:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(6, 182, 212, 0.15);
}

.level-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.level-header h3 {
    font-size: 1.5rem;
    color: #f1f5f9;
}

.level-badge {
    background: var(--gradient-secondary);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
}

.path-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.topic-item h4 {
    color: #e2e8f0;
    margin-bottom: 0.25rem;
}

.topic-item p {
    color: #94a3b8;
    font-size: 0.9rem;
}

/* 实战项目 */
.projects {
    background: linear-gradient(180deg, transparent, rgba(139, 92, 246, 0.05), transparent);
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    display: flex;
    gap: 1.5rem;
    transition: all 0.3s ease;
    align-items: flex-start;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 40px rgba(139, 92, 246, 0.2);
}

.project-image {
    font-size: 3rem;
    flex-shrink: 0;
}

.project-info {
    flex-grow: 1;
}

.project-info h3 {
    font-size: 1.25rem;
    color: #f1f5f9;
    margin-bottom: 0.5rem;
}

.project-info p {
    color: #94a3b8;
    margin-bottom: 1rem;
}

.project-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.tag {
    background: rgba(99, 102, 241, 0.2);
    color: var(--primary-color);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
}

/* 技术趋势 */
.trends {
    background: linear-gradient(180deg, transparent, rgba(16, 185, 129, 0.05), transparent);
}

.trend-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.trend-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    position: relative;
    transition: all 0.3s ease;
}

.trend-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(16, 185, 129, 0.15);
}

.trend-number {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 3rem;
    font-weight: 800;
    color: rgba(16, 185, 129, 0.15);
}

.trend-item h3 {
    font-size: 1.25rem;
    color: #f1f5f9;
    margin-bottom: 0.75rem;
    padding-right: 3rem;
}

.trend-item p {
    color: #94a3b8;
}

/* 页脚 */
.footer {
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
    padding: 3rem 0;
    text-align: center;
    margin-top: 5rem;
}

.footer p {
    color: #94a3b8;
    margin-bottom: 0.5rem;
}

.footer-note {
    font-size: 0.875rem;
    color: #64748b;
}

/* 动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }

    .nav-links {
        display: none;
    }

    .tech-grid,
    .project-grid,
    .trend-grid {
        grid-template-columns: 1fr;
    }

    .project-card {
        flex-direction: column;
        text-align: center;
    }

    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2rem;
    }

    .container {
        padding: 0 15px;
    }

    .tech-card,
    .project-card,
    .trend-item,
    .path-level {
        padding: 1.5rem;
    }
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 卡片进入动画 */
.tech-card,
.project-card,
.trend-item,
.path-level {
    animation: fadeInUp 0.6s ease;
}

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

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

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

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

/* Python代码示例样式 */
.python-code {
    background: linear-gradient(180deg, transparent, rgba(99, 102, 241, 0.05), transparent);
}

.section-subtitle {
    text-align: center;
    color: #94a3b8;
    font-size: 1.1rem;
    margin-bottom: 3rem;
}

.code-sections {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.code-section {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.code-section:hover {
    box-shadow: 0 10px 40px rgba(99, 102, 241, 0.2);
}

.code-header {
    background: rgba(99, 102, 241, 0.1);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid var(--border-color);
}

.code-header h3 {
    margin: 0;
    color: #f1f5f9;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.code-header h3::before {
    content: '📝';
    font-size: 1.5rem;
}

.copy-btn {
    background: var(--gradient-primary);
    color: white;
    border: none;
    padding: 0.5rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.copy-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.copy-btn:active {
    transform: translateY(0);
}

.code-block {
    margin: 0;
    padding: 2rem;
    background: #0f172a;
    overflow-x: auto;
    font-family: 'Fira Code', 'Monaco', 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.8;
    color: #e2e8f0;
    position: relative;
    white-space: pre;
    word-wrap: normal;
}

.code-block code {
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
    color: inherit;
    display: block;
    white-space: pre;
    overflow-x: auto;
}

.code-block::-webkit-scrollbar {
    height: 8px;
}

.code-block::-webkit-scrollbar-track {
    background: var(--bg-color);
}

.code-block::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

.code-block code {
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
    color: inherit;
    display: block;
    white-space: pre;
    overflow-x: auto;
}

/* 改进代码块的显示 */
.code-block {
    background: #1a1a2e;
    border-left: 4px solid var(--primary-color);
}

/* 确保代码不会溢出 */
.code-block code {
    display: block;
    white-space: pre;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

/* 代码高亮颜色 */
.language-python {
    display: block;
}

/* 注释 */
code .comment {
    color: #6b7280;
    font-style: italic;
}

/* 关键字 */
code .keyword {
    color: #f472b6;
    font-weight: bold;
}

/* 字符串 */
code .string {
    color: #34d399;
}

/* 数字 */
code .number {
    color: #fbbf24;
}

/* 函数名 */
code .function {
    color: #60a5fa;
}

/* 变量 */
code .variable {
    color: #f97316;
}

/* 运算符 */
code .operator {
    color: #f472b6;
}

/* 装饰器 */
code .decorator {
    color: #a78bfa;
}

/* 内置函数 */
code .builtin {
    color: #2dd4bf;
}

/* 属性 */
code .attribute {
    color: #fb923c;
}

/* 类名 */
code .class {
    color: #f472b6;
    font-weight: bold;
}

/* 简单的语法高亮（CSS选择器模拟） */
code:contains("#") {
    color: #6b7280;
}

/* 代码行号 */
.code-block::before {
    counter-reset: line;
}

/* 代码复制成功提示 */
.copy-btn.copied {
    background: #10b981;
}

.copy-btn.copied::after {
    content: ' ✓已复制';
}

/* 响应式代码块 */
@media (max-width: 768px) {
    .code-header {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }

    .code-block {
        padding: 1rem;
        font-size: 0.8rem;
        line-height: 1.6;
    }

    .code-section {
        border-radius: 12px;
    }
}

@media (max-width: 480px) {
    .code-block {
        padding: 0.75rem;
        font-size: 0.75rem;
    }

    .copy-btn {
        padding: 0.4rem 1rem;
        font-size: 0.8rem;
    }

    .code-header h3 {
        font-size: 1rem;
    }
}

/* 代码块动画 */
.code-section {
    animation: fadeInUp 0.6s ease;
}

/* 代码块悬停效果 */
.code-section:hover .code-block {
    background: #1e293b;
    transition: background 0.3s ease;
}