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

:root {
    --primary-color: #6366f1;
    --secondary-color: #8b5cf6;
    --accent-color: #10b981;
    --text-dark: #1e293b;
    --text-light: #64748b;
    --text-muted: #94a3b8;
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --accent-gradient: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    --card-gradient: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    --hover-gradient: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    --success-gradient: linear-gradient(135deg, var(--accent-color) 0%, #059669 100%);
    --warning-gradient: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    --info-gradient: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 
                 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-light);
}

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

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--text-dark);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    margin: 1rem auto;
    border-radius: 2px;
}

.section-subtitle {
    text-align: center;
    color: var(--text-light);
    font-size: 1.1rem;
    margin-bottom: 3rem;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 32px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: #667eea;
    color: white;
    border: none;
    padding: 0.8rem 2rem;
    border-radius: 30px;
    font-weight: 500;
}

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

.btn-outline {
    background: transparent;
    color: #667eea;
    border: 2px solid #667eea;
    padding: 0.8rem 2rem;
    border-radius: 30px;
    font-weight: 500;
}

.btn-outline:hover {
    background: #667eea;
    color: white;
    transform: translateY(-2px);
}

/* 首页样式 */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 100px 20px;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    opacity: 0.9;
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.85;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
}

.hero-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    margin: 4rem auto 0;
}

.feature-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
}

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

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.feature-card p {
    opacity: 0.9;
}

/* 预览部分 */
.preview-section {
    padding: 80px 20px;
    background: var(--bg-white);
}

.path-preview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.path-card {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.path-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.path-number {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}

.path-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.path-card p {
    color: var(--text-light);
    margin-bottom: 1rem;
}

.path-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.path-link:hover {
    color: var(--secondary-color);
}

/* 详情页面样式 */
.detail-section {
    padding: 100px 20px;
    background: var(--bg-light);
}

.detail-content {
    background: var(--bg-white);
    border-radius: var(--radius-xl);
    padding: 3.5rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.detail-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.detail-subtitle {
    font-size: 1.75rem;
    font-weight: 600;
    margin: 2.5rem 0 1.25rem;
    color: var(--text-dark);
    padding-bottom: 0.75rem;
    border-bottom: 3px solid var(--accent-gradient);
}

.detail-text {
    line-height: 1.8;
    color: var(--text-light);
    margin-bottom: 1.75rem;
    font-size: 1.1rem;
}

.architecture-diagram {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    margin: 2.5rem 0;
    text-align: center;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
}

.feature-list {
    list-style: none;
    padding: 0;
    margin: 1.75rem 0;
}

.feature-list li {
    padding: 1rem 0;
    padding-left: 2.5rem;
    position: relative;
    color: var(--text-light);
    line-height: 1.7;
    font-size: 1.05rem;
    transition: all var(--transition);
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
    font-size: 1.3rem;
    background: linear-gradient(135deg, var(--accent-color) 0%, #059669 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.feature-list li:hover {
    transform: translateX(10px);
    color: var(--text-dark);
}

.back-link {
    display: inline-block;
    margin-top: 2.5rem;
    padding: 0.9rem 2rem;
    background: var(--accent-gradient);
    color: white;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition);
    box-shadow: var(--shadow-md);
}

.back-link:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-color) 100%);
}

/* 代码块样式 */
.code-block {
    background: #1e293b;
    color: #f8fafc;
    padding: 2rem;
    border-radius: var(--radius-lg);
    overflow-x: auto;
    margin: 1.5rem 0;
    box-shadow: var(--shadow-lg);
}

.code-block pre {
    margin: 0;
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 0.95rem;
    line-height: 1.6;
}

/* 测试用例表格样式 */
.test-cases-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.test-cases-table th {
    background: var(--accent-gradient);
    color: white;
    padding: 1rem;
    text-align: left;
    font-weight: 600;
}

.test-cases-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-white);
    color: var(--text-light);
}

.test-cases-table tr:hover td {
    background: var(--bg-light);
    color: var(--text-dark);
}

/* 页脚 */
.footer {
    background: #1e293b;
    color: white;
    padding: 3rem 20px 2rem;
    text-align: center;
}

.copyright {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.95rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .section-title {
        font-size: 2rem;
    }
    
    .section-subtitle {
        font-size: 1rem;
    }
    
    .container {
        padding: 0 15px;
    }

    .hero {
        padding: 60px 20px;
    }

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

    .hero-subtitle {
        font-size: 1.2rem;
    }

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

    .hero-buttons .btn {
        width: 100%;
        max-width: 300px;
    }
}