/* 全局样式 */
:root {
    /* 颜色定义 */
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --bg-tertiary: #374151;
    --accent-primary: #38bdf8;
    --accent-secondary: #2dd4bf;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #374151;
    --shadow-primary: rgba(56, 189, 248, 0.1);
    --shadow-glow: rgba(56, 189, 248, 0.3);
    
    /* 字体 */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* 间距 */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* 顶部导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(17, 24, 39, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 4rem;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.logo-icon {
    width: 2rem;
    height: 2rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: 1.2rem;
}

.brand-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

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

.cta-btn {
    background: var(--accent-primary);
    color: white;
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.cta-btn:hover {
    background: var(--accent-secondary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-glow);
}

/* 英雄区域 */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
}

.particles {
    position: absolute;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(56, 189, 248, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(45, 212, 191, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(56, 189, 248, 0.05) 0%, transparent 50%);
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(180deg); }
}

.hero-content {
    max-width: 800px;
    padding: var(--space-2xl) var(--space-md);
    z-index: 1;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-lg);
    background: linear-gradient(135deg, var(--text-primary), var(--accent-primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    gap: var(--space-lg);
    justify-content: center;
    flex-wrap: wrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    padding: var(--space-md) var(--space-2xl);
    border-radius: var(--radius-lg);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    box-shadow: 0 4px 14px var(--shadow-primary);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px var(--shadow-glow);
}

.btn-secondary {
    color: var(--accent-primary);
    padding: var(--space-md) var(--space-2xl);
    border: 2px solid var(--accent-primary);
    border-radius: var(--radius-lg);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
}

.btn-secondary:hover {
    background: var(--accent-primary);
    color: white;
    transform: translateY(-3px);
}

/* 产品特性 */
.features {
    padding: var(--space-3xl) 0;
    background: var(--bg-secondary);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--space-3xl);
    color: var(--text-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-xl);
    max-width: 1200px;
    margin: 0 auto;
}

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

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
    box-shadow: 0 10px 30px rgba(56, 189, 248, 0.1);
}

.feature-icon {
    width: 3rem;
    height: 3rem;
    color: var(--accent-primary);
    margin-bottom: var(--space-lg);
}

.feature-icon svg {
    width: 100%;
    height: 100%;
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 文档目录 */
.docs {
    padding: var(--space-3xl) 0;
    background: var(--bg-primary);
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: var(--space-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.search-container {
    max-width: 500px;
    margin: 0 auto var(--space-3xl);
    position: relative;
}

.search-box {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.search-box:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--shadow-primary);
}

.search-box::placeholder {
    color: var(--text-muted);
}

.docs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.doc-card {
    background: var(--bg-secondary);
    padding: var(--space-2xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    cursor: pointer;
}

.doc-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
    box-shadow: 0 10px 30px rgba(56, 189, 248, 0.1);
}

.doc-icon {
    width: 2.5rem;
    height: 2.5rem;
    color: var(--accent-primary);
    margin-bottom: var(--space-lg);
}

.doc-icon svg {
    width: 100%;
    height: 100%;
}

.doc-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.doc-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 安装区域 */
.install {
    padding: var(--space-3xl) 0;
    background: var(--bg-secondary);
}

.terminal {
    max-width: 800px;
    margin: var(--space-2xl) auto 0;
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.terminal-header {
    background: var(--bg-tertiary);
    padding: var(--space-md) var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.terminal-controls {
    display: flex;
    gap: var(--space-sm);
}

.control {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.close { background: #ff5f56; }
.minimize { background: #ffbd2e; }
.maximize { background: #27ca3f; }

.terminal-title {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.terminal-body {
    padding: var(--space-lg);
}

.command-line {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-family: var(--font-mono);
    font-size: 1rem;
}

.prompt {
    color: var(--accent-primary);
    font-weight: 600;
}

.command {
    color: var(--text-primary);
    flex: 1;
}

.copy-btn {
    background: var(--accent-primary);
    color: white;
    border: none;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.copy-btn:hover {
    background: var(--accent-secondary);
    transform: translateY(-2px);
}

/* 页脚 */
.footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: var(--space-2xl) 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-lg);
}

.footer-brand h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.footer-brand p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: var(--space-lg);
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-container {
        padding: 0 var(--space-md);
    }
    
    .nav-links {
        gap: var(--space-lg);
    }
    
    .nav-link {
        font-size: 0.9rem;
    }
    
    .hero-content {
        padding: var(--space-xl) var(--space-md);
    }
    
    .hero-description {
        font-size: 1.1rem;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
    
    .docs-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
    
    .command-line {
        flex-wrap: wrap;
        gap: var(--space-sm);
    }
    
    .copy-btn {
        margin-top: var(--space-sm);
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-sm);
    }
    
    .feature-card,
    .doc-card {
        padding: var(--space-lg);
    }
    
    .terminal {
        margin: var(--space-lg) auto 0;
    }
    
    .command-line {
        font-size: 0.9rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
}