/* 基础变量 */
:root {
    --primary-green: #22c55e;
    --primary-green-dark: #16a34a;
    --primary-green-light: #4ade80;
    --primary-green-pale: #dcfce7;
    --secondary-green: #059669;
    --accent-green: #10b981;
    
    --background: #ffffff;
    --background-secondary: #f8fafc;
    --background-tertiary: #f1f5f9;
    --surface: rgba(255, 255, 255, 0.95);
    --surface-secondary: rgba(248, 250, 252, 0.8);
    
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-tertiary: #94a3b8;
    --text-inverse: #ffffff;
    
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    --glass-backdrop: rgba(255, 255, 255, 0.25);
    --glass-border: rgba(255, 255, 255, 0.18);
    
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 玻璃效果工具类 */
.glass {
    background: var(--glass-backdrop);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
}

.glass-strong {
    background: rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

/* 容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--glass-backdrop);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    transition: all 0.3s ease;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 4rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text-primary);
}

.logo {
    width: 2rem;
    height: 2rem;
}

.brand-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-green), var(--secondary-green));
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

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

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-green);
    transition: width 0.3s ease;
}

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

.language-selector select {
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 0.25rem;
    cursor: pointer;
}

.nav-toggle span {
    width: 1.5rem;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s ease;
}

/* 主内容 */
.main-content {
    margin-top: 4rem;
}

/* 英雄区域 */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, 
        var(--primary-green-pale) 0%, 
        rgba(34, 197, 94, 0.1) 50%, 
        var(--background) 100%);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 20%, rgba(34, 197, 94, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(16, 185, 129, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 60%, rgba(34, 197, 94, 0.05) 0%, transparent 50%);
    animation: float 20s ease-in-out infinite;
}

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

.hero-content {
    text-align: center;
    z-index: 1;
    position: relative;
}

.hero-title {
    margin-bottom: 2rem;
}

.hero-title-main {
    display: block;
    font-size: 4rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-green), var(--secondary-green));
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

.hero-title-sub {
    display: block;
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.hero-install {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
    background: var(--glass-backdrop);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 1rem;
    padding: 1.5rem 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 3rem;
}

.install-command {
    font-family: var(--font-mono);
    font-size: 1.125rem;
    color: var(--text-primary);
    background: var(--background-tertiary);
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    flex: 1;
}

.copy-btn {
    background: var(--primary-green);
    color: var(--text-inverse);
    border: none;
    border-radius: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.copy-btn:hover {
    background: var(--primary-green-dark);
    transform: translateY(-2px);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--glass-backdrop);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 0.75rem;
    padding: 1rem 1.5rem;
    transition: transform 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-4px);
}

.stat-icon {
    font-size: 1.25rem;
}

.stat-text {
    font-weight: 500;
    color: var(--text-secondary);
}

/* 特性展示 */
.features {
    padding: 6rem 0;
    background: var(--background-secondary);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4rem;
}

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

.feature-card {
    background: var(--surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-light);
    border-radius: 1rem;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-green-light);
}

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

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

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

/* 代码演示 */
.code-demo {
    padding: 6rem 0;
    background: var(--background);
}

.demo-tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.tab-btn {
    background: transparent;
    border: 2px solid var(--border);
    border-radius: 0.75rem;
    padding: 0.75rem 1.5rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
}

.tab-btn.active,
.tab-btn:hover {
    background: var(--primary-green);
    border-color: var(--primary-green);
    color: var(--text-inverse);
}

.demo-content {
    position: relative;
}

.tab-content {
    display: none;
    background: var(--glass-backdrop);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 1rem;
    overflow: hidden;
}

.tab-content.active {
    display: block;
}

.tab-content pre {
    margin: 0;
    padding: 2rem;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
    background: var(--background-tertiary);
}

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

/* 赞助商 */
.sponsors {
    padding: 6rem 0;
    background: var(--background-secondary);
}

.sponsor-tiers {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.sponsor-tier h3 {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2rem;
}

.sponsor-cards {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.sponsor-card {
    background: var(--surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 2px dashed var(--border);
    border-radius: 1rem;
    padding: 3rem 2rem;
    text-align: center;
    transition: all 0.3s ease;
    min-width: 200px;
}

.sponsor-card.placeholder:hover {
    border-color: var(--primary-green);
    transform: translateY(-4px);
}

.sponsor-card span {
    color: var(--text-tertiary);
    font-weight: 500;
}

/* 页脚 */
.footer {
    background: var(--text-primary);
    color: var(--text-inverse);
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--primary-green-light);
}

.footer-section p {
    color: var(--text-tertiary);
    margin-bottom: 1rem;
}

.footer-section a {
    display: block;
    color: var(--text-tertiary);
    text-decoration: none;
    margin-bottom: 0.5rem;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: var(--primary-green-light);
}

.footer-bottom {
    border-top: 1px solid var(--text-secondary);
    padding-top: 2rem;
    text-align: center;
}

.footer-bottom p {
    color: var(--text-tertiary);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 4rem;
        left: 0;
        right: 0;
        background: var(--glass-backdrop);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--glass-border);
        padding: 2rem 1.5rem;
        flex-direction: column;
        gap: 1.5rem;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        z-index: 999;
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .language-selector {
        margin-top: 1rem;
    }
    
    .hero-title-main {
        font-size: 2.5rem;
    }
    
    .hero-title-sub {
        font-size: 1.25rem;
    }
    
    .hero-install {
        flex-direction: column;
        padding: 1rem;
    }
    
    .hero-stats {
        gap: 1rem;
    }
    
    .stat-item {
        padding: 0.75rem 1rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .demo-tabs {
        gap: 0.5rem;
    }
    
    .tab-btn {
        padding: 0.5rem 1rem;
        font-size: 0.875rem;
    }
    
    .tab-content pre {
        padding: 1rem;
        font-size: 0.8rem;
    }
    
    .sponsor-cards {
        gap: 1rem;
    }
    
    .sponsor-card {
        min-width: 150px;
        padding: 2rem 1rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    .nav-container {
        padding: 0 1rem;
    }
    
    .hero-title-main {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .feature-card {
        padding: 1.5rem;
    }
}

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

.feature-card {
    animation: fadeInUp 0.6s ease-out;
}

.feature-card:nth-child(1) { animation-delay: 0.1s; }
.feature-card:nth-child(2) { animation-delay: 0.2s; }
.feature-card:nth-child(3) { animation-delay: 0.3s; }
.feature-card:nth-child(4) { animation-delay: 0.4s; }
.feature-card:nth-child(5) { animation-delay: 0.5s; }
.feature-card:nth-child(6) { animation-delay: 0.6s; }
.feature-card:nth-child(7) { animation-delay: 0.7s; }
.feature-card:nth-child(8) { animation-delay: 0.8s; }

/* 代码高亮样式 */
.language-go .token.keyword {
    color: var(--primary-green-dark);
    font-weight: 600;
}

.language-go .token.string {
    color: #059669;
}

.language-go .token.comment {
    color: var(--text-tertiary);
    font-style: italic;
}

.language-go .token.function {
    color: var(--secondary-green);
}

.language-go .token.number {
    color: #dc2626;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--primary-green);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-green-dark);
}