/* ============================================================
   index.css - 官网首页样式
   风格：明亮现代风 + 科技感
   配色：白色/浅灰背景 + 蓝紫渐变强调色
   ============================================================ */

/* ---------- CSS 变量 ---------- */
:root {
    --index-primary: #4a6cf7;
    --index-primary-light: #6b8cff;
    --index-secondary: #8b5cf6;
    --index-accent: #a78bfa;
    --index-bg: #ffffff;
    --index-bg-alt: #f8f9fc;
    --index-bg-card: #ffffff;
    --index-text: #1a1d2e;
    --index-text-secondary: #5a5f7a;
    --index-text-muted: #8b90a7;
    --index-border: #e8eaf0;
    --index-shadow-sm: 0 2px 8px rgba(74, 108, 247, 0.06);
    --index-shadow-md: 0 8px 24px rgba(74, 108, 247, 0.1);
    --index-shadow-lg: 0 16px 48px rgba(74, 108, 247, 0.12);
    --index-radius: 16px;
    --index-radius-sm: 12px;
    --index-transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 深色模式变量 */
[data-theme="dark"] {
    --index-bg: #0f1117;
    --index-bg-alt: #161822;
    --index-bg-card: #1c1f2e;
    --index-text: #e8eaf0;
    --index-text-secondary: #a0a4b8;
    --index-text-muted: #6b7089;
    --index-border: #2a2d3e;
    --index-shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --index-shadow-md: 0 8px 24px rgba(0, 0, 0, 0.25);
    --index-shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.3);
}

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

.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 3.5rem;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--index-text);
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--index-text-secondary);
    line-height: 1.6;
}

/* ---------- 滚动入场动画 ---------- */
.scroll-reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
    will-change: opacity, transform;
}

.scroll-reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================================
   Hero 区域
   ============================================================ */
.hero {
    position: relative;
    padding: 7rem 2rem 5rem;
    overflow: hidden;
    background: var(--index-bg-alt);
    text-align: center;
}

/* CSS 网格线装饰背景 */
.hero-grid-bg {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--index-border) 1px, transparent 1px),
        linear-gradient(90deg, var(--index-border) 1px, transparent 1px);
    background-size: 60px 60px;
    opacity: 0.4;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 20%, transparent 70%);
    pointer-events: none;
}

/* 模糊光斑装饰 */
.hero-blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.35;
    pointer-events: none;
    will-change: transform;
}

.hero-blob-1 {
    width: 400px;
    height: 400px;
    background: var(--index-primary);
    top: -100px;
    left: -80px;
    opacity: 0.15;
}

.hero-blob-2 {
    width: 350px;
    height: 350px;
    background: var(--index-secondary);
    top: -50px;
    right: -60px;
    opacity: 0.12;
}

.hero-blob-3 {
    width: 300px;
    height: 300px;
    background: var(--index-accent);
    bottom: -80px;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0.1;
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 800px;
    margin: 0 auto;
}

/* 版本徽章 */
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(74, 108, 247, 0.1);
    color: var(--index-primary);
    padding: 0.4rem 1rem;
    border-radius: 100px;
    font-weight: 600;
    font-size: 0.875rem;
    margin-bottom: 1.75rem;
    border: 1px solid rgba(74, 108, 247, 0.15);
}

/* Hero 标题 */
.hero h1 {
    font-size: 3.25rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.25rem;
    color: var(--index-text);
    letter-spacing: -0.03em;
}

/* 副标题 */
.hero-subtitle {
    font-size: 1.25rem;
    color: var(--index-text-secondary);
    max-width: 600px;
    margin: 0 auto 0.75rem;
    line-height: 1.7;
}

/* 品牌色强调关键词 */
.gradient-highlight {
    color: var(--index-primary);
    font-weight: 700;
}

/* 描述文字 */
.hero-desc {
    font-size: 1rem;
    color: var(--index-text-muted);
    max-width: 520px;
    margin: 0 auto 2.5rem;
    line-height: 1.6;
}

/* CTA 按钮组 */
.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    align-items: center;
}

/* 主按钮 */
.btn-hero-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    color: #fff;
    background: var(--index-primary);
    border-radius: var(--index-radius-sm);
    border: none;
    text-decoration: none;
    box-shadow: 0 4px 16px rgba(74, 108, 247, 0.35);
    transition: transform var(--index-transition), box-shadow var(--index-transition);
    will-change: transform;
}

.btn-hero-primary:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(74, 108, 247, 0.45);
    color: #fff;
}

/* 次按钮 */
.btn-hero-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--index-text-secondary);
    background: var(--index-bg);
    border-radius: var(--index-radius-sm);
    border: 1px solid var(--index-border);
    text-decoration: none;
    transition: transform var(--index-transition), box-shadow var(--index-transition);
    will-change: transform;
}

.btn-hero-secondary:hover {
    transform: translateY(-4px);
    box-shadow: var(--index-shadow-md);
    border-color: var(--index-primary);
    color: var(--index-primary);
}

/* ============================================================
   数据统计条
   ============================================================ */
.stats-bar {
    padding: 3rem 0;
    background: var(--index-bg);
    border-bottom: 1px solid var(--index-border);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--index-primary);
    line-height: 1.2;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 0.9375rem;
    color: var(--index-text-muted);
    font-weight: 500;
}

/* ============================================================
   核心优势区域
   ============================================================ */
.features {
    padding: 5rem 2rem;
    background: var(--index-bg-alt);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

/* 特性卡片 */
.feature-card {
    padding: 2rem;
    border-radius: var(--index-radius);
    background: var(--index-bg-card);
    border: 1px solid var(--index-border);
    transition: transform var(--index-transition), box-shadow var(--index-transition);
    will-change: transform;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--index-shadow-md);
}

/* 图标容器 */
.feature-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--index-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.375rem;
    margin-bottom: 1.25rem;
}

.icon-blue {
    background: rgba(74, 108, 247, 0.1);
    color: var(--index-primary);
}

.icon-purple {
    background: rgba(139, 92, 246, 0.1);
    color: var(--index-secondary);
}

.icon-green {
    background: rgba(16, 185, 129, 0.1);
    color: #10b981;
}

.icon-orange {
    background: rgba(245, 158, 11, 0.1);
    color: #f59e0b;
}

.icon-pink {
    background: rgba(236, 72, 153, 0.1);
    color: #ec4899;
}

.icon-cyan {
    background: rgba(6, 182, 212, 0.1);
    color: #06b6d4;
}

.feature-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--index-text);
    margin-bottom: 0.5rem;
}

.feature-card p {
    font-size: 0.9375rem;
    color: var(--index-text-secondary);
    line-height: 1.65;
}

/* ============================================================
   技术架构展示
   ============================================================ */
.tech-stack {
    padding: 5rem 2rem;
    background: var(--index-bg);
}

.tech-icons {
    display: flex;
    gap: 2.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.tech-icon-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.625rem;
    color: var(--index-text-muted);
    transition: transform var(--index-transition), color var(--index-transition);
    will-change: transform;
}

.tech-icon-item:hover {
    transform: translateY(-4px);
    color: var(--index-primary);
}

.tech-icon-item span {
    font-size: 0.8125rem;
    font-weight: 500;
}

/* ============================================================
   定价方案
   ============================================================ */
.pricing {
    padding: 5rem 2rem;
    background: var(--index-bg-alt);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    max-width: 1000px;
    margin: 0 auto;
}

.pricing-card {
    padding: 2.5rem 2rem;
    border-radius: var(--index-radius);
    background: var(--index-bg-card);
    border: 1px solid var(--index-border);
    text-align: center;
    transition: transform var(--index-transition), box-shadow var(--index-transition);
    will-change: transform;
}

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

.pricing-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--index-text);
    margin-bottom: 1rem;
}

.pricing-price {
    margin-bottom: 1rem;
}

.pricing-currency {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--index-primary);
    vertical-align: top;
    line-height: 2.2;
}

.pricing-amount {
    font-size: 3rem;
    font-weight: 800;
    color: var(--index-primary);
    letter-spacing: -0.03em;
    line-height: 1;
}

.pricing-desc {
    font-size: 0.9375rem;
    color: var(--index-text-secondary);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.btn-pricing {
    display: inline-block;
    width: 100%;
    padding: 0.75rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--index-primary);
    background: transparent;
    border: 1.5px solid var(--index-primary);
    border-radius: var(--index-radius-sm);
    text-decoration: none;
    transition: transform var(--index-transition), box-shadow var(--index-transition), background var(--index-transition), color var(--index-transition);
    will-change: transform;
}

.btn-pricing:hover {
    transform: translateY(-4px);
    box-shadow: var(--index-shadow-sm);
    background: var(--index-primary);
    color: #fff;
}

/* ============================================================
   CTA 区域
   ============================================================ */
.cta-section {
    padding: 5rem 2rem;
    background: linear-gradient(135deg, var(--index-primary) 0%, var(--index-secondary) 100%);
    text-align: center;
}

.cta-content {
    max-width: 600px;
    margin: 0 auto;
}

.cta-title {
    font-size: 2.25rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.cta-text {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.btn-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--index-primary);
    background: #fff;
    border-radius: var(--index-radius-sm);
    text-decoration: none;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
    transition: transform var(--index-transition), box-shadow var(--index-transition);
    will-change: transform;
}

.btn-cta:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
    color: var(--index-primary);
}

/* ============================================================
   响应式 - 768px 断点
   ============================================================ */
@media (max-width: 768px) {
    /* Hero */
    .hero {
        padding: 5rem 1.25rem 3.5rem;
    }

    .hero h1 {
        font-size: 2rem;
        margin-bottom: 1rem;
    }

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

    .hero-desc {
        font-size: 0.9375rem;
        margin-bottom: 2rem;
    }

    .hero-buttons {
        flex-direction: column;
        gap: 0.75rem;
    }

    .btn-hero-primary,
    .btn-hero-secondary {
        width: 100%;
        justify-content: center;
    }

    .hero-badge {
        font-size: 0.8125rem;
        padding: 0.35rem 0.875rem;
    }

    /* 统计条 */
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .stat-number {
        font-size: 2rem;
    }

    /* 区域间距 */
    .features,
    .tech-stack,
    .pricing,
    .cta-section {
        padding: 3.5rem 1.25rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .section-subtitle {
        font-size: 1rem;
    }

    .section-header {
        margin-bottom: 2.5rem;
    }

    /* 特性卡片 */
    .features-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .feature-card {
        padding: 1.5rem;
    }

    /* 技术图标 */
    .tech-icons {
        gap: 1.5rem;
    }

    /* 定价 */
    .pricing-grid {
        grid-template-columns: 1fr;
    }

    .pricing-card {
        padding: 2rem 1.5rem;
    }

    .pricing-amount {
        font-size: 2.5rem;
    }

    /* CTA */
    .cta-title {
        font-size: 1.75rem;
    }

    .cta-text {
        font-size: 1rem;
    }

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