/* 闪跃 Flashleap - 纯原生 CSS 样式表 (极简·秒开·全响应式·浅色风格) */
:root {
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --bg-card-hover: #f1f5f9;
    --bg-glass: rgba(255, 255, 255, 0.85);
    --border-color: #e2e8f0;
    --border-highlight: #2563eb;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --accent-cyan: #0284c7;
    --accent-purple: #7c3aed;
    --accent-green: #059669;
    --gradient-hero: linear-gradient(135deg, #0284c7 0%, #2563eb 50%, #7c3aed 100%);
    --gradient-btn: linear-gradient(90deg, #2563eb 0%, #7c3aed 100%);
    --gradient-btn-hover: linear-gradient(90deg, #1d4ed8 0%, #6d28d9 100%);
    --shadow-card: 0 4px 20px rgba(15, 23, 42, 0.05);
    --shadow-glow: 0 10px 30px rgba(37, 99, 235, 0.15);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --max-width: 1200px;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

a {
    color: inherit;
    text-decoration: none;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 Header */
header.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
}

.nav-wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.logo-icon {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 10px rgba(37, 99, 235, 0.25);
}

.logo-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

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

.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.95rem;
    transition: color 0.2s ease;
}

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

/* CTA 统一按钮样式 */
.btn-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 12px 28px;
    min-height: 48px;
    background: var(--gradient-btn);
    color: #ffffff;
    font-size: 1rem;
    font-weight: 700;
    border-radius: var(--radius-sm);
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
    cursor: pointer;
    text-align: center;
}

.btn-cta svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    transition: transform 0.25s ease;
}

.btn-cta:hover svg {
    transform: scale(1.15) rotate(-6deg);
}

.btn-cta:hover {
    background: var(--gradient-btn-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.45);
}

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

.btn-cta-lg {
    padding: 16px 36px;
    font-size: 1.15rem;
    min-height: 54px;
    border-radius: var(--radius-md);
}

.btn-cta-secondary {
    background: #ffffff;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
}

.btn-cta-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: #eff6ff;
}

/* Hero 主视觉区 */
.hero-section {
    padding: 90px 0 60px;
    text-align: center;
    position: relative;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.82) 0%, rgba(248, 250, 252, 0.94) 100%), url('hero-bg.jpg') center/cover no-repeat;
    border-bottom: 1px solid var(--border-color);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 18px;
    background: #eff6ff;
    border: 1px solid #bfdbfe;
    border-radius: 50px;
    color: var(--primary-color);
    font-size: 0.88rem;
    font-weight: 600;
    margin-bottom: 24px;
}

.hero-badge .dot {
    width: 8px;
    height: 8px;
    background-color: var(--accent-green);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--accent-green);
}

.hero-title {
    font-size: 3.2rem;
    font-weight: 900;
    line-height: 1.18;
    margin-bottom: 20px;
    letter-spacing: -1px;
    color: var(--text-primary);
}

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

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 760px;
    margin: 0 auto 36px;
    font-weight: 400;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 50px;
}

.hero-metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    max-width: 800px;
    margin: 0 auto;
    padding: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card);
}

.metric-item .metric-val {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary-color);
}

.metric-item .metric-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* 公用 Section 布局 */
.section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-tag {
    color: var(--primary-color);
    font-weight: 700;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 8px;
    display: block;
}

.section-title {
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--text-primary);
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-top: 10px;
}

/* 核心优势 Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 30px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-card);
    transition: all 0.3s ease;
}

.feature-card:hover {
    border-color: var(--border-highlight);
    background: #ffffff;
    box-shadow: 0 10px 30px rgba(37, 99, 235, 0.12);
    transform: translateY(-4px);
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: #eff6ff;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* 流媒体与 AI 支持 */
.support-box {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-card);
}

.support-category {
    margin-bottom: 32px;
}

.support-category:last-child {
    margin-bottom: 0;
}

.category-title {
    font-size: 1.1rem;
    color: var(--primary-color);
    font-weight: 700;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.service-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.tag-item {
    background: #f1f5f9;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px 20px;
    border-radius: 50px;
    font-size: 0.95rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s ease;
}

.tag-item:hover {
    border-color: var(--primary-color);
    background: #eff6ff;
    color: var(--primary-color);
    transform: scale(1.03);
}

/* 套餐价格对比 */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 28px;
    align-items: stretch;
}

.pricing-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    display: flex;
    flex-direction: column;
    position: relative;
    box-shadow: var(--shadow-card);
    transition: all 0.3s ease;
}

.pricing-card.popular {
    border-color: var(--primary-color);
    box-shadow: 0 10px 35px rgba(37, 99, 235, 0.18);
    background: linear-gradient(180deg, #f0f7ff 0%, var(--bg-card) 100%);
}

.popular-badge {
    position: absolute;
    top: -14px;
    right: 24px;
    background: var(--gradient-btn);
    color: #fff;
    font-size: 0.78rem;
    font-weight: 800;
    padding: 4px 14px;
    border-radius: 50px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.plan-name {
    font-size: 1.4rem;
    font-weight: 800;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.plan-desc {
    color: var(--text-secondary);
    font-size: 0.88rem;
    margin-bottom: 24px;
}

.plan-price {
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--text-primary);
    margin-bottom: 20px;
    display: flex;
    align-items: baseline;
    gap: 4px;
}

.plan-price .currency {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.plan-price .unit {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.plan-features {
    list-style: none;
    margin-bottom: 30px;
    flex-grow: 1;
}

.plan-features li {
    padding: 10px 0;
    border-bottom: 1px dashed var(--border-color);
    color: var(--text-secondary);
    font-size: 0.92rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.plan-features li::before {
    content: "✓";
    color: var(--accent-green);
    font-weight: 900;
}

/* 用户评价 */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.testimonial-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 28px;
    box-shadow: var(--shadow-card);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 16px;
}

.avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--gradient-hero);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    color: #fff;
    font-size: 1.1rem;
}

.user-details .name {
    font-weight: 700;
    font-size: 1rem;
    color: var(--text-primary);
}

.user-details .role {
    font-size: 0.82rem;
    color: var(--text-muted);
}

.rating {
    color: #f59e0b;
    margin-bottom: 12px;
    font-size: 0.9rem;
}

.review-text {
    color: var(--text-secondary);
    font-size: 0.92rem;
    line-height: 1.6;
}

/* FAQ 常见问题 (纯 CSS 折叠) */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

details.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 18px 24px;
    box-shadow: var(--shadow-card);
    transition: border-color 0.2s ease;
}

details.faq-item[open] {
    border-color: var(--primary-color);
}

summary.faq-question {
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
    color: var(--text-primary);
}

summary.faq-question::-webkit-details-marker {
    display: none;
}

summary.faq-question::after {
    content: "+";
    font-size: 1.4rem;
    color: var(--primary-color);
    font-weight: 400;
    transition: transform 0.2s ease;
}

details[open] summary.faq-question::after {
    content: "−";
    transform: rotate(180deg);
}

.faq-answer {
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* 规范页脚 Footer */
footer.site-footer {
    border-top: 1px solid var(--border-color);
    background: #ffffff;
    padding: 40px 0;
    text-align: center;
}

.footer-nav {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 32px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.footer-nav a {
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 1rem;
    transition: color 0.2s ease;
}

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

.footer-copy {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* 子页面 Common Page 结构样式 */
.subpage-container {
    padding: 60px 0 100px;
    max-width: 860px;
    margin: 0 auto;
}

.subpage-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-card);
}

.subpage-title {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 12px;
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subpage-meta {
    color: var(--text-muted);
    font-size: 0.88rem;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.subpage-content h2 {
    font-size: 1.4rem;
    font-weight: 700;
    margin: 28px 0 12px;
    color: var(--text-primary);
}

.subpage-content p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.7;
}

.subpage-content ul {
    margin: 0 0 20px 20px;
    color: var(--text-secondary);
}

.subpage-content li {
    margin-bottom: 8px;
}

/* 响应式适配 @media */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero-title {
        font-size: 2.2rem;
    }

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

    .hero-actions {
        flex-direction: column;
        gap: 12px;
    }

    .btn-cta {
        width: 100%;
    }

    .hero-metrics {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .section {
        padding: 50px 0;
    }

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

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

    .footer-nav {
        flex-direction: column;
        gap: 16px;
    }

    .subpage-card {
        padding: 24px;
    }
}