:root {
  --bg-color: #f4fdf8;
  --surface-color: #ffffff;
  --emerald-primary: #10b981;
  --emerald-dark: #047857;
  --emerald-light: #34d399;
  --amber-accent: #f59e0b;
  --cyan-accent: #06b6d4;
  --text-main: #0f172a;
  --text-sec: #475569;
  --text-mut: #94a3b8;
  --border-light: #e2e8f0;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(16, 185, 129, 0.1), 0 2px 4px -1px rgba(16, 185, 129, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(16, 185, 129, 0.1), 0 4px 6px -2px rgba(16, 185, 129, 0.05);
  --shadow-glow: 0 0 20px rgba(16, 185, 129, 0.3);
  --font-base: "Inter", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --border-radius: 16px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--font-base); background-color: var(--bg-color); color: var(--text-main); line-height: 1.6; }
a { text-decoration: none; color: inherit; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }
ul, ol { list-style: none; }

/* Spin animation for download button */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes pulseGlow {
  0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
  70% { box-shadow: 0 0 0 15px rgba(16, 185, 129, 0); }
  100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

/* Layout & Utils */
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.text-center { text-align: center; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }
.gap-8 { gap: 2rem; }
.mt-4 { margin-top: 1rem; }
.mt-8 { margin-top: 2rem; }
.mt-12 { margin-top: 3rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-8 { margin-bottom: 2rem; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0.75rem 1.5rem; border-radius: 9999px; font-weight: 600; font-size: 1rem;
  transition: all 0.3s ease; position: relative; overflow: hidden;
}
.btn-primary {
  background: linear-gradient(135deg, var(--emerald-primary), var(--emerald-dark));
  color: #fff; box-shadow: var(--shadow-md);
}
.btn-primary:hover {
  transform: translateY(-2px); box-shadow: var(--shadow-glow);
}
.btn-primary.pulse { animation: pulseGlow 2s infinite; }
.btn-outline {
  border: 2px solid var(--emerald-primary); color: var(--emerald-primary);
  background: transparent;
}
.btn-outline:hover { background: rgba(16, 185, 129, 0.05); }
.btn-amber {
  background: linear-gradient(135deg, var(--amber-accent), #d97706);
  color: #fff; box-shadow: var(--shadow-md);
}
.btn-amber:hover { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3); }

/* Top Navigation */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.9); backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(16, 185, 129, 0.1);
  padding: 1rem 0; transition: all 0.3s ease;
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; }
.nav-brand { display: flex; align-items: center; gap: 0.5rem; font-size: 1.5rem; font-weight: 800; color: var(--emerald-dark); letter-spacing: -0.5px; }
.nav-brand svg { width: 32px; height: 32px; color: var(--emerald-primary); }
.nav-links { display: flex; gap: 2rem; align-items: center; }
.nav-link { font-weight: 500; color: var(--text-sec); transition: color 0.3s ease; position: relative; padding: 0.5rem 0; }
.nav-link:hover { color: var(--emerald-primary); }
.nav-link.active { color: var(--emerald-dark); font-weight: 700; }
.nav-link.active::after {
  content: ''; position: absolute; bottom: 0; left: 0; width: 100%; height: 3px;
  background: var(--emerald-primary); border-radius: 3px;
}
.mobile-toggle { display: none; background: transparent; border: none; color: var(--emerald-dark); font-size: 1.5rem; }
.mobile-menu { display: none; background: var(--surface-color); padding: 1rem; border-top: 1px solid var(--border-light); }
.mobile-menu .nav-link { display: block; padding: 0.75rem 0; border-bottom: 1px solid var(--border-light); }
.mobile-menu .btn { width: 100%; margin-top: 1rem; }

/* Sections */
.sec-padding { padding: 5rem 0; }
.sec-title { font-size: 2.5rem; font-weight: 800; color: var(--text-main); margin-bottom: 1rem; letter-spacing: -1px; }
.sec-desc { font-size: 1.125rem; color: var(--text-sec); max-width: 600px; margin: 0 auto 3rem; }

/* Hero Section */
.hero {
  position: relative; overflow: hidden; padding: 6rem 0 8rem;
  background: radial-gradient(circle at 100% 0%, rgba(16, 185, 129, 0.15) 0%, transparent 50%),
              radial-gradient(circle at 0% 100%, rgba(6, 182, 212, 0.1) 0%, transparent 50%);
}
.hero-content { max-width: 800px; margin: 0 auto; text-align: center; position: relative; z-index: 10; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.5rem 1rem;
  background: rgba(16, 185, 129, 0.1); color: var(--emerald-dark);
  border-radius: 999px; font-weight: 600; font-size: 0.875rem; margin-bottom: 1.5rem;
  border: 1px solid rgba(16, 185, 129, 0.2);
}
.hero-title { font-size: 4rem; font-weight: 900; line-height: 1.1; margin-bottom: 1.5rem; letter-spacing: -2px; }
.hero-title span { color: var(--emerald-primary); position: relative; }
.hero-subtitle { font-size: 1.25rem; color: var(--text-sec); margin-bottom: 2.5rem; max-width: 650px; margin-inline: auto; }
.hero-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.hero-trust { margin-top: 3rem; display: flex; justify-content: center; gap: 2rem; color: var(--text-mut); font-size: 0.875rem; font-weight: 500; }
.hero-trust div { display: flex; align-items: center; gap: 0.5rem; }
.hero-trust svg { width: 18px; height: 18px; color: var(--emerald-primary); }

/* Features Grid */
.features-sec { background: var(--surface-color); position: relative; z-index: 2; border-radius: 40px 40px 0 0; margin-top: -40px; box-shadow: 0 -10px 30px rgba(0,0,0,0.02); }
.feat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem; }
.feat-card {
  background: var(--bg-color); padding: 2.5rem 2rem; border-radius: var(--border-radius);
  transition: all 0.3s ease; border: 1px solid transparent; position: relative; overflow: hidden;
}
.feat-card:hover { background: var(--surface-color); border-color: rgba(16, 185, 129, 0.2); box-shadow: var(--shadow-lg); transform: translateY(-5px); }
.feat-card::before {
  content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 4px;
  background: linear-gradient(90deg, var(--emerald-primary), var(--cyan-accent)); opacity: 0; transition: opacity 0.3s ease;
}
.feat-card:hover::before { opacity: 1; }
.feat-icon {
  width: 64px; height: 64px; border-radius: 16px; background: rgba(16, 185, 129, 0.1);
  color: var(--emerald-primary); display: flex; align-items: center; justify-content: center; margin-bottom: 1.5rem;
}
.feat-card h3 { font-size: 1.5rem; font-weight: 700; margin-bottom: 1rem; }
.feat-card p { color: var(--text-sec); line-height: 1.7; }

/* Platform Section */
.plat-sec { background: linear-gradient(180deg, var(--surface-color), var(--bg-color)); }
.plat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1.5rem; }
.plat-card {
  background: var(--surface-color); border-radius: var(--border-radius); padding: 2rem;
  text-align: center; box-shadow: var(--shadow-sm); border: 1px solid var(--border-light);
  transition: all 0.3s ease;
}
.plat-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: var(--emerald-primary); }
.plat-card.featured {
  background: linear-gradient(180deg, #f8fafc, #ffffff); border: 2px solid var(--emerald-light);
  box-shadow: var(--shadow-md); transform: scale(1.05); z-index: 2; position: relative;
}
.plat-card.featured::after {
  content: '推荐'; position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
  background: var(--amber-accent); color: #fff; font-size: 0.75rem; font-weight: 700;
  padding: 4px 12px; border-radius: 999px; letter-spacing: 1px;
}
.plat-icon { width: 56px; height: 56px; margin: 0 auto 1.5rem; color: var(--text-main); }
.plat-card.featured .plat-icon { color: var(--emerald-primary); }
.plat-title { font-size: 1.25rem; font-weight: 700; margin-bottom: 0.5rem; }
.plat-ver { font-size: 0.875rem; color: var(--text-mut); margin-bottom: 1.5rem; }

/* Deep Showcase */
.showcase-row { display: flex; align-items: center; gap: 4rem; margin-bottom: 6rem; }
.showcase-row.rev { flex-direction: row-reverse; }
.showcase-content { flex: 1; }
.showcase-visual { flex: 1; position: relative; }
.showcase-badge { display: inline-block; padding: 4px 12px; border-radius: 6px; font-size: 0.875rem; font-weight: 600; margin-bottom: 1rem; }
.scb-emerald { background: rgba(16, 185, 129, 0.1); color: var(--emerald-dark); }
.scb-cyan { background: rgba(6, 182, 212, 0.1); color: #0891b2; }
.scb-amber { background: rgba(245, 158, 11, 0.1); color: #b45309; }
.showcase-title { font-size: 2.5rem; font-weight: 800; margin-bottom: 1.5rem; line-height: 1.2; }
.showcase-desc { font-size: 1.125rem; color: var(--text-sec); margin-bottom: 2rem; }
.showcase-list { display: flex; flex-direction: column; gap: 1rem; }
.showcase-list li { display: flex; align-items: flex-start; gap: 0.75rem; font-size: 1.05rem; font-weight: 500; }
.showcase-list svg { width: 24px; height: 24px; color: var(--emerald-primary); flex-shrink: 0; }
.visual-box {
  background: var(--surface-color); border-radius: 24px; padding: 2rem;
  box-shadow: 0 20px 40px -10px rgba(0,0,0,0.05); border: 1px solid var(--border-light);
  position: relative; overflow: hidden;
}
.visual-box::before {
  content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%;
  background: linear-gradient(135deg, rgba(16,185,129,0.05), transparent); pointer-events: none;
}
.vb-graph { display: flex; align-items: flex-end; justify-content: space-between; height: 200px; gap: 1rem; margin-top: 2rem; }
.vb-bar { flex: 1; background: #e2e8f0; border-radius: 8px 8px 0 0; position: relative; overflow: hidden; }
.vb-bar-fill { position: absolute; bottom: 0; left: 0; width: 100%; background: var(--emerald-primary); border-radius: 8px 8px 0 0; }
.vb-bar:nth-child(2) .vb-bar-fill { background: var(--cyan-accent); }
.vb-bar:nth-child(3) .vb-bar-fill { background: var(--amber-accent); }

/* Reviews */
.reviews-sec { background: var(--surface-color); }
.rev-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem; }
.rev-card { background: var(--bg-color); padding: 2rem; border-radius: var(--border-radius); border: 1px solid var(--border-light); }
.rev-stars { color: var(--amber-accent); margin-bottom: 1rem; display: flex; gap: 4px; }
.rev-text { font-size: 1.125rem; font-style: italic; color: var(--text-main); margin-bottom: 1.5rem; line-height: 1.6; }
.rev-user { display: flex; align-items: center; gap: 1rem; }
.rev-avatar { width: 48px; height: 48px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 700; color: #fff; font-size: 1.2rem; }
.ra-1 { background: var(--emerald-primary); }
.ra-2 { background: var(--cyan-accent); }
.ra-3 { background: var(--amber-accent); }
.rev-info h4 { font-weight: 700; font-size: 1rem; }
.rev-info p { color: var(--text-mut); font-size: 0.875rem; }

/* FAQ */
.faq-wrap { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--surface-color); border: 1px solid var(--border-light);
  border-radius: 12px; margin-bottom: 1rem; overflow: hidden; transition: all 0.3s ease;
}
.faq-item:hover { border-color: var(--emerald-light); }
.faq-q {
  padding: 1.5rem; display: flex; justify-content: space-between; align-items: center;
  cursor: pointer; font-weight: 700; font-size: 1.125rem; user-select: none;
}
.faq-chevron { transition: transform 0.3s ease; color: var(--text-mut); }
.faq-item.open .faq-chevron { transform: rotate(180deg); color: var(--emerald-primary); }
.faq-item.open { border-color: var(--emerald-primary); box-shadow: var(--shadow-sm); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.4s ease; background: var(--bg-color); }
.faq-item.open .faq-a { max-height: 500px; }
.faq-a-inner { padding: 0 1.5rem 1.5rem; color: var(--text-sec); line-height: 1.7; }

/* CTA Banner */
.cta-banner { padding: 4rem 2rem; background: linear-gradient(135deg, var(--emerald-dark), var(--emerald-primary)); border-radius: 24px; color: #fff; text-align: center; position: relative; overflow: hidden; box-shadow: var(--shadow-lg); margin-bottom: 4rem; }
.cta-banner::before { content: ''; position: absolute; top: -50%; left: -10%; width: 50%; height: 200%; background: rgba(255,255,255,0.1); transform: rotate(30deg); }
.cta-title { font-size: 2.5rem; font-weight: 800; margin-bottom: 1rem; }
.cta-desc { font-size: 1.125rem; opacity: 0.9; margin-bottom: 2rem; max-width: 600px; margin-inline: auto; }
.cta-btn { background: #fff; color: var(--emerald-dark); box-shadow: 0 10px 20px rgba(0,0,0,0.1); }
.cta-btn:hover { background: #f8fafc; transform: translateY(-2px); box-shadow: 0 15px 25px rgba(0,0,0,0.15); }

/* Download Hero */
.dl-hero { padding: 4rem 0 6rem; background: var(--surface-color); border-bottom: 1px solid var(--border-light); }
.dl-main-card {
  background: var(--bg-color); border-radius: 24px; border: 1px solid var(--emerald-light);
  padding: 3rem; text-align: center; max-width: 800px; margin: 0 auto; box-shadow: var(--shadow-lg);
  position: relative; overflow: hidden;
}
.dl-main-card::after {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 6px;
  background: linear-gradient(90deg, var(--emerald-primary), var(--cyan-accent));
}
.dl-mc-icon { width: 80px; height: 80px; color: var(--emerald-primary); margin: 0 auto 1.5rem; }
.dl-mc-title { font-size: 2.5rem; font-weight: 800; margin-bottom: 0.5rem; }
.dl-mc-meta { color: var(--text-mut); font-size: 1rem; margin-bottom: 2rem; display: flex; justify-content: center; gap: 1.5rem; flex-wrap: wrap; }
.dl-mc-meta span { display: flex; align-items: center; gap: 0.5rem; }
.dl-specs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; margin-bottom: 2.5rem; background: var(--surface-color); padding: 1.5rem; border-radius: 16px; border: 1px solid var(--border-light); }
.dl-spec-label { font-size: 0.875rem; color: var(--text-mut); margin-bottom: 0.25rem; }
.dl-spec-val { font-weight: 700; color: var(--text-main); font-size: 1.125rem; }

/* Timeline/Guides */
.guide-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; }
.guide-col { background: var(--surface-color); padding: 2.5rem; border-radius: 24px; border: 1px solid var(--border-light); }
.guide-title { display: flex; align-items: center; gap: 1rem; font-size: 1.5rem; font-weight: 800; margin-bottom: 2rem; border-bottom: 1px solid var(--border-light); padding-bottom: 1rem; }
.step-item { display: flex; gap: 1.5rem; margin-bottom: 2rem; position: relative; }
.step-item:not(:last-child)::after {
  content: ''; position: absolute; top: 40px; left: 19px; width: 2px; height: calc(100% - 20px);
  background: var(--border-light);
}
.step-num { width: 40px; height: 40px; border-radius: 50%; background: var(--emerald-primary); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; flex-shrink: 0; font-size: 1.125rem; z-index: 2; }
.guide-col:nth-child(2) .step-num { background: var(--cyan-accent); }
.step-body h4 { font-size: 1.125rem; font-weight: 700; margin-bottom: 0.5rem; padding-top: 8px; }
.step-body p { color: var(--text-sec); font-size: 0.95rem; line-height: 1.6; }

/* Article/SEO Layout */
.art-hero { padding: 4rem 0; background: var(--surface-color); text-align: center; border-bottom: 1px solid var(--border-light); }
.tag-cloud { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.75rem; margin-top: 2rem; }
.kw-tag { padding: 0.4rem 1rem; background: var(--bg-color); border: 1px solid var(--border-light); border-radius: 999px; font-size: 0.875rem; color: var(--text-sec); transition: all 0.3s; }
.kw-tag:hover { border-color: var(--emerald-primary); color: var(--emerald-dark); background: rgba(16, 185, 129, 0.05); }
.art-layout { display: grid; grid-template-columns: 1fr 300px; gap: 4rem; padding: 4rem 0; }
.art-body { font-size: 1.125rem; line-height: 1.8; color: var(--text-main); }
.art-body h2 { font-size: 2rem; font-weight: 800; margin: 3rem 0 1.5rem; color: var(--emerald-dark); position: relative; padding-bottom: 0.75rem; border-bottom: 2px solid var(--border-light); }
.art-body h2::after { content: ''; position: absolute; left: 0; bottom: -2px; width: 60px; height: 2px; background: var(--emerald-primary); }
.art-body h3 { font-size: 1.5rem; font-weight: 700; margin: 2rem 0 1rem; }
.art-body p { margin-bottom: 1.5rem; }
.art-body ul { margin-bottom: 1.5rem; padding-left: 1.5rem; }
.art-body li { margin-bottom: 0.5rem; position: relative; }
.art-body li::before { content: '•'; color: var(--emerald-primary); position: absolute; left: -1.5rem; font-weight: bold; }
.cmp-table { width: 100%; border-collapse: collapse; margin: 2rem 0; background: var(--surface-color); border-radius: 12px; overflow: hidden; box-shadow: var(--shadow-sm); }
.cmp-table th, .cmp-table td { padding: 1rem 1.5rem; text-align: left; border-bottom: 1px solid var(--border-light); }
.cmp-table th { background: var(--bg-color); font-weight: 700; color: var(--emerald-dark); }
.cmp-table tr:last-child td { border-bottom: none; }
.sidebar { position: sticky; top: 100px; }
.side-box { background: var(--surface-color); border: 1px solid var(--border-light); border-radius: 16px; padding: 1.5rem; margin-bottom: 2rem; box-shadow: var(--shadow-sm); }
.side-box h4 { font-size: 1.125rem; font-weight: 700; margin-bottom: 1rem; color: var(--emerald-dark); display: flex; align-items: center; gap: 0.5rem; }
.side-dl-btn { display: flex; align-items: center; gap: 1rem; padding: 1rem; background: var(--bg-color); border: 1px solid var(--border-light); border-radius: 12px; margin-bottom: 1rem; transition: all 0.3s; width: 100%; text-align: left; }
.side-dl-btn:hover { border-color: var(--emerald-primary); background: #fff; box-shadow: var(--shadow-sm); }
.side-dl-btn svg { width: 24px; height: 24px; color: var(--text-sec); }
.side-dl-btn.active-dl { border-color: var(--emerald-primary); background: rgba(16, 185, 129, 0.05); }
.side-dl-btn.active-dl svg { color: var(--emerald-primary); }
.side-toc li { margin-bottom: 0.75rem; }
.side-toc a { color: var(--text-sec); font-size: 0.95rem; transition: color 0.3s; display: block; padding: 4px 8px; border-radius: 6px; }
.side-toc a:hover { color: var(--emerald-primary); background: var(--bg-color); }

/* Footer */
.footer { background: var(--text-main); color: rgba(255,255,255,0.7); padding: 4rem 0 2rem; margin-top: 4rem; }
.footer-inner { display: flex; flex-direction: column; align-items: center; text-align: center; gap: 1.5rem; }
.footer-safe { display: inline-flex; align-items: center; gap: 0.75rem; padding: 0.75rem 1.5rem; background: rgba(16, 185, 129, 0.1); border: 1px solid rgba(16, 185, 129, 0.2); border-radius: 999px; color: var(--emerald-light); font-weight: 600; font-size: 1.125rem; }
.footer-note { font-size: 0.875rem; max-width: 600px; line-height: 1.6; }

@media (max-width: 992px) {
  .hero-title { font-size: 3rem; }
  .showcase-row, .showcase-row.rev { flex-direction: column; gap: 2rem; }
  .art-layout { grid-template-columns: 1fr; }
  .sidebar { position: static; }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .mobile-toggle { display: block; }
  .hero { padding: 4rem 0; }
  .hero-title { font-size: 2.25rem; }
  .guide-grid { grid-template-columns: 1fr; }
  .dl-specs { grid-template-columns: 1fr; }
}