/* ========== Reset & Base ========== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif; color: #1a1a2e; line-height: 1.7; background: #fff; }
a { text-decoration: none; color: inherit; transition: color .3s; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ========== Header / Nav ========== */
.site-header { position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; background: rgba(255,255,255,.92); backdrop-filter: blur(12px); border-bottom: 1px solid rgba(0,0,0,.06); transition: box-shadow .3s; }
.site-header.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,.08); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.logo { display: flex; align-items: center; gap: 10px; font-size: 1.5rem; font-weight: 700; color: #e6a800; }
.logo svg { width: 36px; height: 36px; }
.nav-links { display: flex; gap: 32px; align-items: center; }
.nav-links a { font-size: .95rem; font-weight: 500; color: #444; transition: color .3s; }
.nav-links a:hover, .nav-links a.active { color: #e6a800; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 28px; border-radius: 50px; font-weight: 600; font-size: .95rem; transition: all .3s ease; cursor: pointer; border: none; }
.btn-primary { background: linear-gradient(135deg, #ffd51e, #e6a800); color: #1a1a2e; box-shadow: 0 4px 15px rgba(255,213,30,.4); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 25px rgba(255,213,30,.55); }
.btn-outline { border: 2px solid #ffd51e; color: #e6a800; background: transparent; }
.btn-outline:hover { background: #ffd51e; color: #1a1a2e; }
.btn-white { background: #fff; color: #e6a800; box-shadow: 0 4px 15px rgba(0,0,0,.1); }
.btn-white:hover { transform: translateY(-2px); box-shadow: 0 6px 25px rgba(0,0,0,.15); }
.btn-lg { padding: 16px 40px; font-size: 1.1rem; }

/* ========== Hero ========== */
.hero { padding: 140px 0 100px; background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 50%, #fde68a 100%); position: relative; overflow: hidden; }
.hero::before { content: ''; position: absolute; top: -50%; right: -20%; width: 600px; height: 600px; border-radius: 50%; background: radial-gradient(circle, rgba(255,213,30,.15), transparent 70%); }
.hero::after { content: ''; position: absolute; bottom: -30%; left: -10%; width: 400px; height: 400px; border-radius: 50%; background: radial-gradient(circle, rgba(230,168,0,.1), transparent 70%); }
.hero .container { display: flex; align-items: center; gap: 60px; position: relative; z-index: 1; }
.hero-text { flex: 1; }
.hero-text h1 { font-size: 3rem; font-weight: 800; line-height: 1.2; margin-bottom: 20px; color: #1a1a2e; }
.hero-text h1 span { color: #e6a800; }
.hero-text p { font-size: 1.15rem; color: #555; margin-bottom: 32px; max-width: 520px; }
.hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-image { flex: 1; display: flex; justify-content: center; }
.hero-image .mockup { width: 100%; max-width: 480px; background: #fff; border-radius: 20px; box-shadow: 0 20px 60px rgba(0,0,0,.12); padding: 30px; }
.hero-image .mockup-header { display: flex; gap: 8px; margin-bottom: 20px; }
.hero-image .mockup-dot { width: 12px; height: 12px; border-radius: 50%; }
.hero-image .mockup-dot:nth-child(1) { background: #ff6b6b; }
.hero-image .mockup-dot:nth-child(2) { background: #ffd93d; }
.hero-image .mockup-dot:nth-child(3) { background: #6bcb77; }
.mockup-body { display: flex; flex-direction: column; gap: 16px; }
.mockup-lang { display: flex; align-items: center; gap: 12px; padding: 14px 18px; background: #fffdf5; border-radius: 12px; font-size: .95rem; color: #333; }
.mockup-lang .flag { font-size: 1.4rem; }
.mockup-arrow { text-align: center; font-size: 1.5rem; color: #e6a800; }
.mockup-result { padding: 14px 18px; background: linear-gradient(135deg, #ffd51e, #e6a800); border-radius: 12px; color: #1a1a2e; font-size: .95rem; }

/* ========== Stats ========== */
.stats { padding: 60px 0; background: #fff; border-bottom: 1px solid #f0f0f0; }
.stats .container { display: flex; justify-content: center; gap: 80px; flex-wrap: wrap; }
.stat-item { text-align: center; }
.stat-item .number { font-size: 2.5rem; font-weight: 800; color: #e6a800; }
.stat-item .label { font-size: .95rem; color: #777; margin-top: 4px; }

/* ========== Features ========== */
.features { padding: 100px 0; background: #fffdf7; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-header h2 { font-size: 2.2rem; font-weight: 700; margin-bottom: 12px; }
.section-header p { font-size: 1.05rem; color: #666; max-width: 600px; margin: 0 auto; }
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.feature-card { background: #fff; border-radius: 16px; padding: 36px 28px; box-shadow: 0 4px 20px rgba(0,0,0,.05); transition: transform .3s, box-shadow .3s; border: 1px solid #f0f0f5; }
.feature-card:hover { transform: translateY(-6px); box-shadow: 0 12px 40px rgba(0,0,0,.1); }
.feature-icon { width: 60px; height: 60px; border-radius: 14px; display: flex; align-items: center; justify-content: center; font-size: 1.6rem; margin-bottom: 20px; }
.feature-icon.blue { background: #fef9e7; color: #e6a800; }
.feature-icon.purple { background: #f3e8ff; color: #7c3aed; }
.feature-icon.green { background: #ecfdf5; color: #10b981; }
.feature-icon.orange { background: #fff7ed; color: #f59e0b; }
.feature-icon.pink { background: #fdf2f8; color: #ec4899; }
.feature-icon.cyan { background: #ecfeff; color: #06b6d4; }
.feature-card h3 { font-size: 1.15rem; font-weight: 600; margin-bottom: 10px; }
.feature-card p { font-size: .92rem; color: #666; line-height: 1.7; }

/* ========== How It Works ========== */
.how-it-works { padding: 100px 0; background: #fff; }
.steps { display: flex; gap: 40px; justify-content: center; flex-wrap: wrap; counter-reset: step; }
.step { flex: 1; min-width: 220px; max-width: 280px; text-align: center; position: relative; }
.step::before { counter-increment: step; content: counter(step); width: 56px; height: 56px; border-radius: 50%; background: linear-gradient(135deg, #ffd51e, #e6a800); color: #1a1a2e; font-size: 1.3rem; font-weight: 700; display: flex; align-items: center; justify-content: center; margin: 0 auto 18px; }
.step h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; }
.step p { font-size: .9rem; color: #666; }

/* ========== Scenarios ========== */
.scenarios { padding: 100px 0; background: #fffdf7; }
.scenario-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; }
.scenario-card { display: flex; gap: 20px; padding: 28px; background: #fff; border-radius: 16px; box-shadow: 0 2px 12px rgba(0,0,0,.04); border: 1px solid #f0f0f5; transition: transform .3s; }
.scenario-card:hover { transform: translateY(-4px); }
.scenario-card .icon { font-size: 2rem; flex-shrink: 0; }
.scenario-card h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 6px; }
.scenario-card p { font-size: .9rem; color: #666; }

/* ========== Testimonials ========== */
.testimonials { padding: 100px 0; background: #fff; }
.testimonial-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.testimonial-card { background: #fffdf7; border-radius: 16px; padding: 30px; border: 1px solid #fef3c7; }
.testimonial-card .stars { color: #f59e0b; font-size: 1rem; margin-bottom: 12px; }
.testimonial-card .quote { font-size: .92rem; color: #555; margin-bottom: 18px; font-style: italic; }
.testimonial-card .author { display: flex; align-items: center; gap: 12px; }
.testimonial-card .avatar { width: 42px; height: 42px; border-radius: 50%; background: linear-gradient(135deg, #ffd51e, #e6a800); display: flex; align-items: center; justify-content: center; color: #1a1a2e; font-weight: 700; font-size: .9rem; }
.testimonial-card .name { font-weight: 600; font-size: .9rem; }
.testimonial-card .role { font-size: .8rem; color: #888; }

/* ========== CTA ========== */
.cta { padding: 100px 0; background: linear-gradient(135deg, #ffd51e, #e6a800); text-align: center; color: #1a1a2e; position: relative; overflow: hidden; }
.cta::before { content: ''; position: absolute; top: -100px; right: -100px; width: 300px; height: 300px; border-radius: 50%; background: rgba(255,255,255,.05); }
.cta h2 { font-size: 2.2rem; font-weight: 700; margin-bottom: 16px; }
.cta p { font-size: 1.1rem; opacity: .9; margin-bottom: 32px; max-width: 500px; margin-left: auto; margin-right: auto; }

/* ========== Footer ========== */
.site-footer { background: #0f0f23; color: #ccc; padding: 60px 0 30px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .logo { color: #fff; margin-bottom: 14px; font-size: 1.3rem; }
.footer-brand p { font-size: .88rem; color: #999; line-height: 1.7; }
.footer-col h4 { font-size: .95rem; font-weight: 600; color: #fff; margin-bottom: 16px; }
.footer-col a { display: block; font-size: .88rem; color: #999; margin-bottom: 10px; transition: color .3s; }
.footer-col a:hover { color: #ffd51e; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.08); padding-top: 24px; display: flex; justify-content: space-between; align-items: center; font-size: .82rem; color: #777; flex-wrap: wrap; gap: 12px; }

/* ========== Download Page ========== */
.download-hero { padding: 140px 0 80px; background: linear-gradient(135deg, #1a1a2e 0%, #2d2000 50%, #3d2e00 100%); color: #fff; text-align: center; position: relative; overflow: hidden; }
.download-hero::before { content: ''; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); width: 800px; height: 800px; border-radius: 50%; background: radial-gradient(circle, rgba(255,213,30,.15), transparent 60%); }
.download-hero h1 { font-size: 2.8rem; font-weight: 800; margin-bottom: 16px; position: relative; }
.download-hero h1 span { color: #ffd51e; }
.download-hero p { font-size: 1.15rem; opacity: .85; max-width: 600px; margin: 0 auto 36px; position: relative; }
.download-hero .version-badge { display: inline-block; background: rgba(255,255,255,.12); padding: 6px 18px; border-radius: 50px; font-size: .85rem; margin-bottom: 24px; position: relative; }

.download-cards { padding: 80px 0; background: #fffdf7; }
.download-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.download-card { background: #fff; border-radius: 20px; padding: 40px 30px; text-align: center; box-shadow: 0 4px 20px rgba(0,0,0,.06); border: 1px solid #eef0f5; transition: transform .3s, box-shadow .3s; }
.download-card:hover { transform: translateY(-8px); box-shadow: 0 16px 50px rgba(0,0,0,.12); }
.download-card.featured { border: 2px solid #ffd51e; position: relative; }
.download-card.featured::before { content: '推荐'; position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: #ffd51e; color: #1a1a2e; padding: 4px 16px; border-radius: 50px; font-size: .75rem; font-weight: 600; }
.download-card .platform-icon { font-size: 3rem; margin-bottom: 16px; }
.download-card h3 { font-size: 1.3rem; font-weight: 700; margin-bottom: 8px; }
.download-card .version { font-size: .85rem; color: #888; margin-bottom: 20px; }
.download-card .specs { text-align: left; margin-bottom: 24px; }
.download-card .specs li { font-size: .88rem; color: #666; padding: 6px 0; border-bottom: 1px solid #f5f5f5; display: flex; align-items: center; gap: 8px; }
.download-card .specs li::before { content: '✓'; color: #10b981; font-weight: 700; }

/* ========== Requirements ========== */
.requirements { padding: 80px 0; background: #fff; }
.req-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.req-card { padding: 28px; background: #fffdf7; border-radius: 14px; border: 1px solid #fef3c7; }
.req-card h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 14px; display: flex; align-items: center; gap: 8px; }
.req-card ul li { font-size: .88rem; color: #666; padding: 5px 0; }

/* ========== Changelog ========== */
.changelog { padding: 80px 0; background: #fffdf7; }
.timeline { max-width: 700px; margin: 0 auto; }
.timeline-item { position: relative; padding-left: 36px; padding-bottom: 36px; border-left: 2px solid #fde68a; }
.timeline-item:last-child { border-left: 2px solid transparent; }
.timeline-item::before { content: ''; position: absolute; left: -7px; top: 4px; width: 12px; height: 12px; border-radius: 50%; background: #ffd51e; }
.timeline-item .version-tag { font-size: .8rem; font-weight: 600; color: #b8860b; background: #fef9e7; padding: 2px 10px; border-radius: 50px; display: inline-block; margin-bottom: 6px; }
.timeline-item h3 { font-size: 1rem; font-weight: 600; margin-bottom: 4px; }
.timeline-item .date { font-size: .8rem; color: #999; margin-bottom: 8px; }
.timeline-item ul { padding-left: 18px; }
.timeline-item ul li { font-size: .88rem; color: #666; padding: 2px 0; list-style: disc; }

/* ========== FAQ ========== */
.faq { padding: 80px 0; background: #fff; }
.faq-list { max-width: 760px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid #eee; }
.faq-item summary { padding: 20px 0; font-size: 1rem; font-weight: 600; cursor: pointer; display: flex; justify-content: space-between; align-items: center; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; font-size: 1.4rem; color: #e6a800; transition: transform .3s; }
.faq-item[open] summary::after { content: '−'; }
.faq-item .answer { padding: 0 0 20px; font-size: .92rem; color: #666; line-height: 1.8; }

/* ========== Inner Pages ========== */
.page-hero { padding: 130px 0 60px; background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 50%, #fde68a 100%); text-align: center; }
.page-hero h1 { font-size: 2.4rem; font-weight: 800; margin-bottom: 12px; color: #1a1a2e; }
.page-hero p { font-size: 1.1rem; color: #555; max-width: 600px; margin: 0 auto; }
.page-content { padding: 80px 0; background: #fff; }
.page-content h2 { font-size: 1.6rem; font-weight: 700; margin-bottom: 16px; margin-top: 40px; color: #1a1a2e; }
.page-content h2:first-child { margin-top: 0; }
.page-content h3 { font-size: 1.2rem; font-weight: 600; margin-bottom: 10px; margin-top: 24px; }
.page-content p { font-size: .95rem; color: #555; line-height: 1.8; margin-bottom: 14px; }
.page-content ul, .page-content ol { padding-left: 20px; margin-bottom: 16px; }
.page-content ul li, .page-content ol li { font-size: .95rem; color: #555; line-height: 1.8; padding: 3px 0; }
.page-content ul li { list-style: disc; }
.page-content ol li { list-style: decimal; }
.page-content .narrow { max-width: 800px; margin: 0 auto; }
.page-content .update-date { font-size: .85rem; color: #999; margin-bottom: 30px; }

/* Pricing */
.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; margin-top: 40px; }
.pricing-card { background: #fff; border-radius: 20px; padding: 40px 30px; text-align: center; box-shadow: 0 4px 20px rgba(0,0,0,.06); border: 1px solid #f0f0f5; transition: transform .3s; }
.pricing-card:hover { transform: translateY(-6px); box-shadow: 0 12px 40px rgba(0,0,0,.1); }
.pricing-card.featured { border: 2px solid #ffd51e; position: relative; }
.pricing-card.featured::before { content: '最受欢迎'; position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: #ffd51e; color: #1a1a2e; padding: 4px 16px; border-radius: 50px; font-size: .75rem; font-weight: 600; }
.pricing-card .price { font-size: 2.5rem; font-weight: 800; color: #e6a800; margin: 16px 0 8px; }
.pricing-card .price span { font-size: .9rem; font-weight: 400; color: #999; }
.pricing-card .plan-name { font-size: 1.3rem; font-weight: 700; }
.pricing-card .plan-desc { font-size: .88rem; color: #888; margin-bottom: 20px; }
.pricing-card .plan-features { text-align: left; margin-bottom: 24px; }
.pricing-card .plan-features li { font-size: .88rem; color: #666; padding: 6px 0; border-bottom: 1px solid #f5f5f5; display: flex; align-items: center; gap: 8px; }
.pricing-card .plan-features li::before { content: '✓'; color: #10b981; font-weight: 700; }

/* Tutorial Steps */
.tutorial-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; margin-top: 30px; }
.tutorial-card { background: #fffdf7; border-radius: 16px; padding: 30px; border: 1px solid #fef3c7; }
.tutorial-card .step-num { display: inline-block; background: linear-gradient(135deg, #ffd51e, #e6a800); color: #1a1a2e; width: 36px; height: 36px; border-radius: 50%; text-align: center; line-height: 36px; font-weight: 700; margin-bottom: 14px; }
.tutorial-card h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 8px; }
.tutorial-card p { font-size: .9rem; color: #666; line-height: 1.7; }

/* Contact */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; margin-top: 40px; }
.contact-form label { display: block; font-size: .9rem; font-weight: 600; margin-bottom: 6px; margin-top: 16px; color: #333; }
.contact-form input, .contact-form textarea, .contact-form select { width: 100%; padding: 12px 16px; border: 1px solid #ddd; border-radius: 10px; font-size: .92rem; font-family: inherit; transition: border-color .3s; }
.contact-form input:focus, .contact-form textarea:focus, .contact-form select:focus { outline: none; border-color: #ffd51e; box-shadow: 0 0 0 3px rgba(255,213,30,.15); }
.contact-form textarea { resize: vertical; min-height: 120px; }
.contact-info-card { background: #fffdf7; border-radius: 16px; padding: 28px; border: 1px solid #fef3c7; margin-bottom: 20px; }
.contact-info-card h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 8px; display: flex; align-items: center; gap: 8px; }
.contact-info-card p { font-size: .9rem; color: #666; }

/* Careers */
.job-card { background: #fff; border-radius: 16px; padding: 28px; box-shadow: 0 2px 12px rgba(0,0,0,.04); border: 1px solid #f0f0f5; margin-bottom: 20px; transition: transform .3s; }
.job-card:hover { transform: translateY(-4px); box-shadow: 0 8px 30px rgba(0,0,0,.08); }
.job-card h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 6px; }
.job-tags { display: flex; gap: 8px; margin-bottom: 12px; flex-wrap: wrap; }
.job-tag { font-size: .75rem; padding: 3px 12px; border-radius: 50px; background: #fef9e7; color: #b8860b; font-weight: 500; }
.job-card p { font-size: .9rem; color: #666; margin-bottom: 12px; }
.job-card ul { padding-left: 18px; margin-bottom: 16px; }
.job-card ul li { font-size: .88rem; color: #666; padding: 2px 0; list-style: disc; }

/* Help */
.help-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 30px; }
.help-card { background: #fff; border-radius: 16px; padding: 30px; text-align: center; box-shadow: 0 2px 12px rgba(0,0,0,.04); border: 1px solid #f0f0f5; transition: transform .3s; cursor: pointer; }
.help-card:hover { transform: translateY(-4px); box-shadow: 0 8px 30px rgba(0,0,0,.08); }
.help-card .help-icon { font-size: 2rem; margin-bottom: 12px; }
.help-card h3 { font-size: 1rem; font-weight: 600; margin-bottom: 6px; }
.help-card p { font-size: .85rem; color: #888; }

@media (max-width: 992px) {
  .pricing-grid { grid-template-columns: 1fr; max-width: 400px; margin-left: auto; margin-right: auto; }
  .tutorial-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .help-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .page-hero h1 { font-size: 1.8rem; }
  .help-grid { grid-template-columns: 1fr; }
}

/* ========== Mobile Nav ========== */
.mobile-toggle { display: none; background: none; border: none; font-size: 1.5rem; cursor: pointer; color: #333; }

/* ========== Responsive ========== */
@media (max-width: 992px) {
  .hero .container { flex-direction: column; text-align: center; }
  .hero-text p { margin-left: auto; margin-right: auto; }
  .hero-buttons { justify-content: center; }
  .features-grid, .download-grid, .req-grid { grid-template-columns: repeat(2, 1fr); }
  .testimonial-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .scenario-grid { grid-template-columns: 1fr; }
  .stats .container { gap: 40px; }
}
@media (max-width: 768px) {
  .mobile-toggle { display: block; }
  .nav-links { display: none; position: absolute; top: 72px; left: 0; width: 100%; background: #fff; flex-direction: column; padding: 20px; gap: 16px; box-shadow: 0 10px 30px rgba(0,0,0,.1); }
  .nav-links.active { display: flex; }
  .hero-text h1 { font-size: 2.2rem; }
  .features-grid, .download-grid, .req-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .section-header h2 { font-size: 1.8rem; }
}