/* 极简原生理 CSS，无任何臃肿框架，确保极速秒开 */
:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --bg: #f8fafc;
    --text: #0f172a;
    --text-light: #475569;
    --white: #ffffff;
    --border: #e2e8f0;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; background-color: var(--bg); color: var(--text); line-height: 1.6; }

/* 导航 */
.navbar { display: flex; justify-content: space-between; align-items: center; padding: 0.75rem 2.5rem; background: rgba(255, 255, 255, 0.85); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border: 1px solid rgba(226, 232, 240, 0.8); position: sticky; top: 1.5rem; z-index: 100; box-shadow: 0 10px 25px -5px rgba(0,0,0,0.05); border-radius: 50px; max-width: 1100px; margin: 1.5rem auto; width: 92%; transition: all 0.3s ease; }
.logo { font-size: 1.75rem; font-weight: 800; color: var(--primary); letter-spacing: -0.5px; }
.nav-links { display: flex; list-style: none; gap: 2rem; }
.nav-links a { text-decoration: none; color: var(--text); font-weight: 500; transition: color 0.2s; }
.nav-links a:hover { color: var(--primary); }

@media (max-width: 768px) {
    .nav-links { display: none; }
    .navbar { padding: 0.75rem 1.5rem; top: 1rem; margin: 1rem auto; }
}

/* 按钮 */
.cta-button { display: inline-block; padding: 0.85rem 1.75rem; background: var(--primary); color: var(--white); text-decoration: none; border-radius: 50px; font-weight: bold; text-align: center; transition: all 0.2s; box-shadow: 0 4px 6px -1px rgba(37, 99, 235, 0.2); }
.cta-button:hover { background: var(--primary-hover); transform: translateY(-1px); box-shadow: 0 6px 8px -1px rgba(37, 99, 235, 0.3); }
.cta-button.outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); box-shadow: none; }
.cta-button.outline:hover { background: var(--primary); color: var(--white); }

/* 主视觉区 */
.hero { display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: 4rem 5% 2rem; max-width: 1000px; margin: 0 auto; min-height: 65vh; gap: 3rem; }
.hero-content { width: 100%; animation: fadeInUp 0.8s ease-out; }
.hero-content h1 { font-size: 3.8rem; margin-bottom: 1.5rem; line-height: 1.15; color: #1e293b; font-weight: 800; letter-spacing: -1px; }
.hero-content p { font-size: 1.25rem; color: var(--text-light); margin-bottom: 2.5rem; max-width: 650px; margin-left: auto; margin-right: auto; }
.hero-graphic { width: 100%; display: flex; justify-content: center; align-items: center; position: relative; height: 280px; }
.dynamic-element { width: 160px; height: 160px; background: linear-gradient(135deg, #60a5fa, #3b82f6); border-radius: 50%; animation: float 4s ease-in-out infinite; position: absolute; box-shadow: 0 20px 25px -5px rgba(59, 130, 246, 0.3); }
.element-2 { background: linear-gradient(135deg, #a78bfa, #8b5cf6); width: 100px; height: 100px; right: calc(50% - 150px); bottom: 20%; animation-delay: 2s; z-index: -1; opacity: 0.8; box-shadow: 0 20px 25px -5px rgba(139, 92, 246, 0.3); border-radius: 30px; }

@keyframes float { 0%, 100% { transform: translateY(0) rotate(0deg); } 50% { transform: translateY(-25px) rotate(5deg); } }

@media (max-width: 768px) {
    .hero { flex-direction: column; text-align: center; padding: 3rem 1rem; }
    .hero-content h1 { font-size: 2.5rem; }
    .hero-graphic { width: 100%; height: 250px; margin-top: 2rem; }
}

/* 通用区块设置 */
section { padding: 4.5rem 5%; max-width: 1200px; margin: 0 auto; }
section h2 { text-align: center; font-size: 2.25rem; margin-bottom: 3.5rem; color: #1e293b; }
.card-container, .pricing-table, .article-grid { display: grid; gap: 2rem; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }

/* 卡片 */
.card { background: var(--white); padding: 2.5rem 2rem; border-radius: 1rem; box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05); text-align: center; border: 1px solid var(--border); transition: transform 0.2s; }
.card:hover { transform: translateY(-5px); }
.card h3 { margin-bottom: 1rem; color: var(--primary); font-size: 1.5rem; }
.card p { color: var(--text-light); }

/* 流媒体与AI */
.media-cards { display: grid; gap: 2rem; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.media-card { background: linear-gradient(135deg, #1e293b, #0f172a); color: var(--white); padding: 2.5rem; border-radius: 1rem; box-shadow: 0 10px 15px -3px rgba(0,0,0,0.2); }
.media-card h3 { font-size: 1.3rem; margin-bottom: 1rem; color: #f8fafc; }
.media-card p { color: #cbd5e1; }

/* 价格表 */
.price-card { background: var(--white); padding: 2.5rem 2rem; border-radius: 1rem; border: 1px solid var(--border); text-align: center; display: flex; flex-direction: column; position: relative; }
.price-card.popular { border: 2px solid var(--primary); transform: scale(1.05); box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1); z-index: 10; }
.price-card.popular::before { content: '最受欢迎'; position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: var(--primary); color: white; padding: 0.25rem 1rem; border-radius: 1rem; font-size: 0.875rem; font-weight: bold; }
.price { font-size: 3rem; font-weight: 800; margin: 1.5rem 0; color: var(--text); }
.price span { font-size: 1rem; color: var(--text-light); font-weight: normal; }
.price-card ul { list-style: none; margin-bottom: 2.5rem; flex: 1; text-align: left; }
.price-card li { padding: 0.75rem 0; border-bottom: 1px solid var(--border); display: flex; align-items: center; }
.price-card li::before { content: '✓'; color: var(--primary); font-weight: bold; margin-right: 0.5rem; }
.price-card li:last-child { border: none; }

@media (max-width: 768px) {
    .price-card.popular { transform: none; }
}

/* 文章卡片 */
.article-card { display: block; background: var(--white); padding: 1.75rem; border-radius: 0.75rem; border: 1px solid var(--border); text-decoration: none; color: var(--text); transition: all 0.2s; }
.article-card:hover { box-shadow: 0 10px 15px -3px rgba(0,0,0,0.05); border-color: #cbd5e1; transform: translateY(-2px); }
.article-card h3 { font-size: 1.15rem; margin-bottom: 0.75rem; color: #1e293b; line-height: 1.4; }
.article-card p { font-size: 0.95rem; color: var(--text-light); }
.highlight-card { border-color: var(--primary); background: #eff6ff; }
.highlight-card h3 { color: var(--primary); }
.inner-link { color: var(--primary); font-weight: bold; text-decoration: underline; }

/* FAQ & 评价 */
.faq, .testimonials { background: var(--white); border-radius: 1rem; padding: 4rem 3rem; box-shadow: 0 1px 3px rgba(0,0,0,0.05); margin-bottom: 4rem; }
.faq-list { display: grid; gap: 2rem; grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)); }
.faq-item { background: #f8fafc; padding: 1.5rem 2rem; border-radius: 0.5rem; border: 1px solid var(--border); }
.faq-item h3 { margin-bottom: 0.75rem; font-size: 1.25rem; color: #1e293b; }
.testimonial-list { display: grid; gap: 2rem; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.testimonial-list blockquote { font-style: italic; color: #334155; padding: 1.5rem 2rem; border-left: 4px solid var(--primary); border-radius: 0 0.5rem 0.5rem 0; background: #f8fafc; font-size: 1.1rem; margin: 0; box-shadow: 0 2px 4px rgba(0,0,0,0.02); }

/* Footer */
footer { background: #0f172a; color: #94a3b8; padding: 4rem 5% 2rem; text-align: center; margin-top: 2rem; }
.footer-links { display: flex; justify-content: center; gap: 2.5rem; margin-bottom: 3rem; flex-wrap: wrap; }
.footer-links a { color: #e2e8f0; text-decoration: none; font-weight: 500; font-size: 1.1rem; transition: color 0.2s; }
.footer-links a:hover { color: var(--white); text-decoration: underline; }
.pbn-links { margin-bottom: 2rem; font-size: 0.9rem; padding: 1.5rem 0; border-top: 1px solid #1e293b; border-bottom: 1px solid #1e293b; }
.copyright { font-size: 0.9rem; margin-top: 2rem; }