/* ===== CSS 变量 ===== */
:root {
    /* 颜色 */
    --primary: #0a0a0a;
    --primary-light: #1a1a1a;
    --text-primary: #171717;
    --text-secondary: #737373;
    --text-tertiary: #a3a3a3;
    --border: #e5e5e5;
    --border-light: #f5f5f5;
    --white: #ffffff;
    
    /* 渐变色 */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-text: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-sphere-1: radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.3) 0%, transparent 50%);
    --gradient-sphere-2: radial-gradient(circle at 80% 20%, rgba(118, 75, 162, 0.25) 0%, transparent 50%);
    --gradient-sphere-3: radial-gradient(circle at 40% 80%, rgba(102, 126, 234, 0.2) 0%, transparent 50%);
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px 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);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* 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;
    --radius-2xl: 1.5rem;
    
    /* 字体 */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* 过渡 */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
}

/* ===== 基础样式 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-fast);
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    outline: none;
}

/* ===== 工具类 ===== */
.gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-light);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1.25rem;
    font-weight: 700;
}

.logo-icon {
    font-size: 1.5rem;
}

.logo-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-link {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

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

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

/* ===== 按钮样式 ===== */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--white);
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-lg);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

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

.btn-secondary {
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

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

.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.btn-outline:hover {
    background: var(--primary-light);
    border-color: var(--primary);
}

.btn-large {
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
}

.btn-full {
    width: 100%;
    justify-content: center;
}

.btn-arrow {
    transition: transform var(--transition-fast);
}

.btn-primary:hover .btn-arrow {
    transform: translateX(4px);
}

/* ===== 英雄区域 ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 100px var(--space-xl) 0;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
}

.gradient-sphere {
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
}

.sphere-1 {
    width: 600px;
    height: 600px;
    top: -200px;
    left: -200px;
    background: var(--gradient-sphere-1);
    animation: float 8s ease-in-out infinite;
}

.sphere-2 {
    width: 500px;
    height: 500px;
    top: -100px;
    right: -150px;
    background: var(--gradient-sphere-2);
    animation: float 10s ease-in-out infinite reverse;
}

.sphere-3 {
    width: 400px;
    height: 400px;
    bottom: -150px;
    left: 30%;
    background: var(--gradient-sphere-3);
    animation: float 12s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0);
    }
    50% {
        transform: translate(30px, -30px);
    }
}

.hero-content {
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: rgba(102, 126, 234, 0.1);
    border: 1px solid rgba(102, 126, 234, 0.2);
    border-radius: var(--radius-xl);
    font-size: 0.875rem;
    color: var(--text-primary);
    margin-bottom: var(--space-xl);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--gradient-primary);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.badge-arrow {
    color: #667eea;
    transition: transform var(--transition-fast);
}

.hero-badge:hover .badge-arrow {
    transform: translateX(4px);
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-xl);
}

.hero-title-sub {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.hero-description {
    font-size: 1.25rem;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: var(--space-2xl);
    max-width: 540px;
}

.hero-cta {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-3xl);
}

.play-icon {
    font-size: 0.75rem;
}

.hero-stats {
    display: flex;
    gap: var(--space-xl);
}

.stat {
    text-align: left;
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1;
    margin-bottom: var(--space-xs);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.stat-divider {
    width: 1px;
    background: var(--border);
}

/* ===== 代码窗口 ===== */
.hero-visual {
    position: relative;
}

.code-window {
    background: var(--primary);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-2xl);
    animation: slideUp 1s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.window-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    background: var(--primary-light);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.window-dots {
    display: flex;
    gap: var(--space-sm);
}

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

.dot.red {
    background: #ff5f57;
}

.dot.yellow {
    background: #febc2e;
}

.dot.green {
    background: #28c840;
}

.window-title {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    font-family: 'SF Mono', Monaco, monospace;
}

.window-content {
    padding: var(--space-lg);
    background: var(--primary);
    overflow-x: auto;
}

.window-content pre {
    font-family: 'SF Mono', Monaco, monospace;
    font-size: 0.875rem;
    line-height: 1.8;
    color: #d4d4d4;
}

.window-content code .keyword {
    color: #c586c0;
}

.window-content code .string {
    color: #ce9178;
}

.window-content code .function {
    color: #dcdcaa;
}

.window-content code .tag {
    color: #569cd6;
}

/* ===== 合作伙伴 ===== */
.partners {
    padding: var(--space-3xl) var(--space-xl);
    text-align: center;
}

.partners-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-tertiary);
    margin-bottom: var(--space-xl);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.partners-grid {
    display: flex;
    justify-content: center;
    gap: var(--space-3xl);
    flex-wrap: wrap;
}

.partner-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-tertiary);
    opacity: 0.5;
    transition: all var(--transition-normal);
}

.partner-logo:hover {
    opacity: 1;
    color: var(--text-secondary);
}

/* ===== 通用区块样式 ===== */
.features,
.pricing,
.testimonials {
    padding: var(--space-3xl) var(--space-xl);
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--space-3xl);
}

.section-badge {
    display: inline-block;
    padding: var(--space-sm) var(--space-md);
    background: rgba(102, 126, 234, 0.1);
    border: 1px solid rgba(102, 126, 234, 0.2);
    border-radius: var(--radius-xl);
    font-size: 0.75rem;
    font-weight: 600;
    color: #667eea;
    margin-bottom: var(--space-md);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-md);
    letter-spacing: -0.01em;
}

.section-description {
    font-size: 1.125rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

/* ===== 功能特性 ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    padding: var(--space-2xl);
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    transition: all var(--transition-normal);
}

.feature-card:hover {
    border-color: rgba(102, 126, 234, 0.3);
    box-shadow: var(--shadow-xl);
    transform: translateY(-4px);
}

.feature-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: rgba(102, 126, 234, 0.1);
    border-radius: var(--radius-lg);
    color: #667eea;
    margin-bottom: var(--space-lg);
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
}

.feature-description {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

.feature-learn-more {
    font-size: 0.875rem;
    font-weight: 600;
    color: #667eea;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.feature-learn-more:hover .arrow {
    transform: translateX(4px);
}

.arrow {
    display: inline-block;
    transition: transform var(--transition-fast);
}

/* ===== 价格方案 ===== */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.pricing-card {
    padding: var(--space-2xl);
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    transition: all var(--transition-normal);
    position: relative;
}

.pricing-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-4px);
}

.pricing-card-popular {
    border-color: rgba(102, 126, 234, 0.5);
    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.1);
}

.popular-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    padding: var(--space-xs) var(--space-md);
    background: var(--gradient-primary);
    color: var(--white);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-xl);
}

.pricing-header {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.pricing-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--space-xs);
}

.pricing-subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

.pricing-price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: var(--space-xs);
}

.price {
    font-size: 3rem;
    font-weight: 800;
    color: var(--text-primary);
}

.price-period {
    font-size: 1rem;
    color: var(--text-secondary);
}

.pricing-features {
    list-style: none;
    margin-bottom: var(--space-xl);
}

.feature-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-sm) 0;
    font-size: 0.875rem;
}

.feature-item.disabled {
    color: var(--text-tertiary);
}

.check {
    color: #28c840;
    font-weight: bold;
}

.cross {
    color: var(--text-tertiary);
}

/* ===== 用户评价 ===== */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.testimonial-card {
    padding: var(--space-2xl);
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    transition: all var(--transition-normal);
}

.testimonial-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-4px);
}

.testimonial-content {
    margin-bottom: var(--space-xl);
}

.testimonial-text {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-primary);
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.author-avatar {
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-weight: 600;
    font-size: 1rem;
}

.author-info {
    display: flex;
    flex-direction: column;
}

.author-name {
    font-size: 0.875rem;
    font-weight: 600;
}

.author-title {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* ===== CTA 区域 ===== */
.cta-section {
    position: relative;
    padding: var(--space-3xl) var(--space-xl);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    overflow: hidden;
}

.cta-content {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
    z-index: 2;
}

.cta-title {
    font-size: 3rem;
    font-weight: 800;
    color: var(--white);
    line-height: 1.2;
    margin-bottom: var(--space-lg);
}

.cta-title .gradient-text {
    background: linear-gradient(135deg, #ffffff 0%, #e0e0e0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.cta-description {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--space-2xl);
}

.cta-buttons {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
}

.cta-visual {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
}

.floating-card {
    position: absolute;
    padding: var(--space-md) var(--space-lg);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-lg);
    animation: float 6s ease-in-out infinite;
}

.card-1 {
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.card-2 {
    top: 60%;
    right: 10%;
    animation-delay: 2s;
}

.card-3 {
    bottom: 20%;
    left: 20%;
    animation-delay: 4s;
}

.card-icon {
    font-size: 1.5rem;
    margin-bottom: var(--space-sm);
}

.card-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--white);
}

.cta-buttons .btn-primary {
    background: var(--white);
    color: #667eea;
}

.cta-buttons .btn-primary:hover {
    background: rgba(255, 255, 255, 0.9);
}

.cta-buttons .btn-outline {
    border-color: rgba(255, 255, 255, 0.5);
    color: var(--white);
}

.cta-buttons .btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--white);
}

/* ===== 页脚 ===== */
.footer {
    background: var(--primary);
    padding: var(--space-3xl) var(--space-xl) var(--space-lg);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.5fr 2.5fr;
    gap: var(--space-3xl);
    margin-bottom: var(--space-2xl);
}

.footer-brand {
    color: var(--white);
}

.footer-description {
    margin-top: var(--space-lg);
    margin-bottom: var(--space-lg);
    color: var(--text-tertiary);
}

.social-links {
    display: flex;
    gap: var(--space-md);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--primary-light);
    border-radius: var(--radius-lg);
    color: var(--text-tertiary);
    transition: all var(--transition-fast);
}

.social-link:hover {
    background: var(--gradient-primary);
    color: var(--white);
    transform: translateY(-2px);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-xl);
}

.footer-heading {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: var(--space-lg);
}

.footer-link {
    display: block;
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin-bottom: var(--space-md);
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--white);
}

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding-top: var(--space-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-title,
    .hero-title-sub {
        font-size: 3rem;
    }
    
    .hero-cta {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .features-grid,
    .pricing-grid,
    .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero-title,
    .hero-title-sub {
        font-size: 2.5rem;
    }
    
    .hero-description {
        font-size: 1.125rem;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .features-grid,
    .pricing-grid,
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .cta-title {
        font-size: 2rem;
    }
    
    .floating-card {
        display: none;
    }
}

@media (max-width: 480px) {
    .nav-cta {
        display: none;
    }
    
    .hero {
        padding: 80px var(--space-md) 0;
    }
    
    .hero-title,
    .hero-title-sub {
        font-size: 2rem;
    }
    
    .features,
    .pricing,
    .testimonials {
        padding: var(--space-2xl) var(--space-md);
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
}