:root {
  --bg-alabaster: #F4F6FB;
  --surface-white: #FFFFFF;
  --surface-tint: #EEF2FF;
  --ink-navy: #0F172A;
  --ink-slate: #334155;
  --ink-muted: #64748B;
  --prism-indigo: #4F46E5;
  --prism-indigo-dark: #3730A3;
  --prism-coral: #F97316;
  --prism-coral-dark: #EA580C;
  --prism-emerald: #10B981;
  --prism-amber: #F59E0B;
  --border-light: #E2E8F0;
  --border-strong: #CBD5E1;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --shadow-studio: 0 10px 30px -8px rgba(15, 23, 42, 0.07), 0 4px 12px -2px rgba(79, 70, 229, 0.05);
  --shadow-hover: 0 18px 38px -10px rgba(79, 70, 229, 0.14), 0 6px 16px -4px rgba(249, 115, 22, 0.08);
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-alabaster);
  color: var(--ink-navy);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

/* Global Link Rules - Prominent Coral/Indigo Accent, Consistent Visited State */
a,
a:visited {
  color: var(--prism-coral);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1.5px;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

a:hover,
a:focus {
  color: var(--prism-indigo);
}

/* Container & Swiss Grid */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Prism Top Accent Ribbon */
.prism-top-bar {
  height: 5px;
  width: 100%;
  background: linear-gradient(90deg, var(--prism-indigo) 0%, var(--prism-coral) 50%, var(--prism-emerald) 100%);
}

/* Header & Navigation */
.site-header {
  background-color: var(--surface-white);
  border-bottom: 1px solid var(--border-light);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 12px rgba(15, 23, 42, 0.03);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  gap: 20px;
}

.brand-logo,
.brand-logo:visited {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink-navy);
}

.brand-logo:hover {
  color: var(--prism-indigo);
}

.brand-logo svg {
  height: 40px;
  width: auto;
  display: block;
}

.main-nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
}

.main-nav a,
.main-nav a:visited {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink-slate);
  text-decoration: none;
  background-color: transparent;
  border: 1px solid transparent;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--prism-indigo);
  background-color: var(--surface-tint);
  border-color: rgba(79, 70, 229, 0.2);
}

.main-nav a.nav-hub-pill,
.main-nav a.nav-hub-pill:visited {
  background-color: #FFF7ED;
  color: var(--prism-coral-dark);
  border: 1px solid #FDBA74;
  font-weight: 700;
}

.main-nav a.nav-hub-pill:hover {
  background-color: var(--prism-coral);
  color: var(--surface-white);
  border-color: var(--prism-coral);
}

/* Side-by-Side Hero Section */
.hero-section {
  padding: 64px 0 72px;
  background: radial-gradient(circle at 85% 20%, rgba(79, 70, 229, 0.07) 0%, transparent 45%),
              radial-gradient(circle at 15% 80%, rgba(249, 115, 22, 0.07) 0%, transparent 45%),
              var(--surface-white);
  border-bottom: 1px solid var(--border-light);
}

.sbs-hero-grid {
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  gap: 44px;
  align-items: center;
}

.studio-badge-row {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background-color: var(--bg-alabaster);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  padding: 6px 16px;
  margin-bottom: 22px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--ink-slate);
}

.badge-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: var(--prism-emerald);
  display: inline-block;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
}

.hero-title {
  font-size: 2.65rem;
  line-height: 1.22;
  font-weight: 800;
  color: var(--ink-navy);
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

.hero-title .prism-highlight {
  color: var(--prism-indigo);
  background: linear-gradient(120deg, rgba(79, 70, 229, 0.12) 0%, rgba(249, 115, 22, 0.14) 100%);
  padding: 0 8px;
  border-radius: 6px;
}

.hero-subtitle {
  font-size: 1.12rem;
  color: var(--ink-slate);
  margin-bottom: 28px;
  max-width: 580px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 28px;
}

.btn-primary,
.btn-primary:visited {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background-color: var(--prism-indigo);
  color: var(--surface-white);
  font-weight: 700;
  font-size: 1.05rem;
  padding: 15px 30px;
  border-radius: var(--radius-md);
  text-decoration: none;
  border: 2px solid var(--prism-indigo);
  box-shadow: 0 8px 20px -4px rgba(79, 70, 229, 0.4);
  transition: transform 0.18s ease, background-color 0.18s ease, box-shadow 0.18s ease;
}

.btn-primary:hover {
  background-color: var(--prism-indigo-dark);
  border-color: var(--prism-indigo-dark);
  color: var(--surface-white);
  transform: translateY(-2px);
  box-shadow: 0 12px 24px -4px rgba(79, 70, 229, 0.5);
}

.btn-secondary,
.btn-secondary:visited {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background-color: #FFF7ED;
  color: var(--prism-coral-dark);
  font-weight: 700;
  font-size: 1.05rem;
  padding: 15px 26px;
  border-radius: var(--radius-md);
  text-decoration: none;
  border: 2px solid var(--prism-coral);
  transition: transform 0.18s ease, background-color 0.18s ease, color 0.18s ease;
}

.btn-secondary:hover {
  background-color: var(--prism-coral);
  color: var(--surface-white);
  transform: translateY(-2px);
}

.sbs-metrics-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  padding-top: 20px;
  border-top: 1px dashed var(--border-strong);
}

.metric-item strong {
  display: block;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--ink-navy);
}

.metric-item span {
  font-size: 0.85rem;
  color: var(--ink-muted);
}

.hero-visual-frame {
  background-color: var(--bg-alabaster);
  border: 2px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 16px;
  box-shadow: var(--shadow-studio);
  position: relative;
}

.hero-anim-img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-md);
}

/* Section Headers */
.section-block {
  padding: 76px 0;
}

.section-block.alt-bg {
  background-color: var(--surface-white);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.section-header {
  max-width: 760px;
  margin: 0 auto 48px;
  text-align: center;
}

.section-kicker {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--prism-indigo);
  background-color: var(--surface-tint);
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 12px;
}

.section-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--ink-navy);
  margin-bottom: 12px;
}

.section-desc {
  color: var(--ink-slate);
  font-size: 1.05rem;
}

/* Studio Cards Grid (4 Cards) */
.studio-grid-4 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.studio-card {
  background-color: var(--surface-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: var(--shadow-studio);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
}

.alt-bg .studio-card {
  background-color: var(--bg-alabaster);
}

.studio-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--prism-indigo);
}

.card-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.icon-box {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--surface-tint);
}

.step-pill {
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
  background-color: #FFF7ED;
  color: var(--prism-coral-dark);
  border: 1px solid #FED7AA;
}

.studio-card h3 {
  font-size: 1.28rem;
  font-weight: 800;
  color: var(--ink-navy);
  margin-bottom: 10px;
}

.studio-card p {
  color: var(--ink-slate);
  font-size: 0.96rem;
}

/* Side-by-Side Comparison Strip inside section */
.sbs-compare-banner {
  margin-top: 32px;
  background-color: var(--surface-white);
  border: 2px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.sbs-col {
  padding: 16px 20px;
  border-radius: var(--radius-md);
}

.sbs-col.legacy {
  background-color: #FEF2F2;
  border-left: 4px solid #EF4444;
}

.sbs-col.liangxin {
  background-color: #ECFDF5;
  border-left: 4px solid var(--prism-emerald);
}

.sbs-col h4 {
  font-size: 1.05rem;
  margin-bottom: 6px;
  color: var(--ink-navy);
}

.sbs-col p {
  font-size: 0.92rem;
  color: var(--ink-slate);
}

/* Pricing Table / 3-Tier Cards */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
  align-items: stretch;
}

.pricing-card {
  background-color: var(--surface-white);
  border: 2px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 34px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-studio);
  position: relative;
}

.pricing-card.featured {
  border-color: var(--prism-indigo);
  background: linear-gradient(180deg, #EEF2FF 0%, #FFFFFF 32%);
  transform: translateY(-6px);
}

.popular-ribbon {
  position: absolute;
  top: -13px;
  right: 24px;
  background-color: var(--prism-coral);
  color: var(--surface-white);
  font-size: 0.78rem;
  font-weight: 800;
  padding: 4px 14px;
  border-radius: 999px;
  letter-spacing: 0.04em;
}

.plan-name {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--ink-navy);
  margin-bottom: 6px;
}

.plan-tagline {
  font-size: 0.9rem;
  color: var(--ink-muted);
  margin-bottom: 20px;
}

.plan-price {
  font-size: 2.4rem;
  font-weight: 900;
  color: var(--prism-indigo);
  line-height: 1.1;
  margin-bottom: 22px;
}

.plan-price span {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink-muted);
}

.plan-features {
  list-style: none;
  margin-bottom: 28px;
  border-top: 1px solid var(--border-light);
  padding-top: 18px;
}

.plan-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--ink-slate);
  margin-bottom: 12px;
}

.plan-features li svg {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  margin-top: 4px;
}

.btn-plan,
.btn-plan:visited {
  display: block;
  text-align: center;
  padding: 14px 20px;
  border-radius: var(--radius-md);
  font-weight: 700;
  text-decoration: none;
  background-color: var(--ink-navy);
  color: var(--surface-white);
}

.pricing-card.featured .btn-plan,
.pricing-card.featured .btn-plan:visited {
  background-color: var(--prism-indigo);
  color: var(--surface-white);
}

.btn-plan:hover {
  background-color: var(--prism-coral);
  color: var(--surface-white);
}

/* FAQ Grid */
.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

.faq-item {
  background-color: var(--surface-white);
  border: 1px solid var(--border-light);
  border-left: 5px solid var(--prism-indigo);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-studio);
}

.faq-item h3 {
  font-size: 1.12rem;
  font-weight: 800;
  color: var(--ink-navy);
  margin-bottom: 10px;
}

.faq-item p {
  font-size: 0.95rem;
  color: var(--ink-slate);
}

/* Testimonials */
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial-card {
  background-color: var(--bg-alabaster);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.testimonial-quote {
  font-size: 0.96rem;
  color: var(--ink-slate);
  margin-bottom: 20px;
  font-style: normal;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-light);
  padding-top: 14px;
}

.author-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--prism-indigo), var(--prism-coral));
  color: var(--surface-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
}

.author-meta strong {
  display: block;
  font-size: 0.95rem;
  color: var(--ink-navy);
}

.author-meta span {
  font-size: 0.82rem;
  color: var(--ink-muted);
}

/* Hub Page & Article Cards */
.hub-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
}

.article-card {
  background-color: var(--surface-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: var(--shadow-studio);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--prism-coral);
}

.article-meta-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 14px;
  font-size: 0.82rem;
}

.article-tag {
  background-color: var(--surface-tint);
  color: var(--prism-indigo);
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 999px;
}

.article-date {
  color: var(--ink-muted);
}

.article-card h2,
.article-card h3 {
  font-size: 1.3rem;
  line-height: 1.4;
  margin-bottom: 12px;
}

.article-card h2 a,
.article-card h2 a:visited,
.article-card h3 a,
.article-card h3 a:visited {
  color: var(--ink-navy);
  text-decoration: none;
}

.article-card h2 a:hover,
.article-card h3 a:hover {
  color: var(--prism-coral);
}

.article-excerpt {
  color: var(--ink-slate);
  font-size: 0.95rem;
  margin-bottom: 20px;
}

.article-readmore,
.article-readmore:visited {
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--prism-coral);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.article-readmore:hover {
  color: var(--prism-indigo);
}

/* Single Article Content Layout */
.article-wrapper {
  max-width: 860px;
  margin: 48px auto 72px;
  background-color: var(--surface-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 48px 52px;
  box-shadow: var(--shadow-studio);
}

.breadcrumb {
  font-size: 0.88rem;
  color: var(--ink-muted);
  margin-bottom: 20px;
}

.breadcrumb a,
.breadcrumb a:visited {
  color: var(--prism-indigo);
  text-decoration: none;
  font-weight: 600;
}

.article-header {
  border-bottom: 2px solid var(--border-light);
  padding-bottom: 24px;
  margin-bottom: 32px;
}

.article-header h1 {
  font-size: 2.1rem;
  line-height: 1.32;
  color: var(--ink-navy);
  margin-bottom: 14px;
}

.article-byline {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-size: 0.88rem;
  color: var(--ink-muted);
}

.article-content h2 {
  font-size: 1.48rem;
  color: var(--ink-navy);
  margin: 34px 0 14px;
  padding-left: 14px;
  border-left: 4px solid var(--prism-indigo);
}

.article-content h3 {
  font-size: 1.18rem;
  color: var(--ink-navy);
  margin: 24px 0 10px;
}

.article-content p {
  font-size: 1.04rem;
  color: var(--ink-slate);
  margin-bottom: 18px;
  line-height: 1.85;
}

.article-content ul,
.article-content ol {
  margin: 0 0 20px 22px;
  color: var(--ink-slate);
}

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

.studio-callout {
  background-color: #FFF7ED;
  border: 1px solid #FDBA74;
  border-left: 5px solid var(--prism-coral);
  padding: 20px 24px;
  border-radius: var(--radius-md);
  margin: 26px 0;
}

.studio-callout p {
  margin-bottom: 0;
  color: var(--ink-navy);
}

.related-section {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 2px dashed var(--border-light);
}

.related-section h2 {
  font-size: 1.35rem;
  margin-bottom: 20px;
}

/* Footer - Strict 4 Chinese Compliance Links */
.site-footer {
  background-color: var(--ink-navy);
  color: var(--surface-white);
  padding: 36px 0;
  margin-top: 40px;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: center;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 28px;
  list-style: none;
}

.footer-links a,
.footer-links a:visited {
  color: #F8FAFC;
  font-size: 0.96rem;
  font-weight: 600;
  text-decoration: none;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.14);
}

.footer-links a:hover {
  color: var(--surface-white);
  background-color: var(--prism-coral);
  border-color: var(--prism-coral);
}

/* Sitemap Grid */
.sitemap-group {
  margin-bottom: 32px;
}

.sitemap-group h2 {
  font-size: 1.35rem;
  margin-bottom: 14px;
  color: var(--ink-navy);
}

.sitemap-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.sitemap-list li {
  background-color: var(--bg-alabaster);
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
}

/* Responsive Design - Strictly Keeping Navigation Visible on Mobile */
@media (max-width: 960px) {
  .sbs-hero-grid,
  .pricing-grid,
  .testimonial-grid {
    grid-template-columns: 1fr;
  }

  .pricing-card.featured {
    transform: none;
  }
}

@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .main-nav {
    display: flex;
    flex-wrap: wrap;
    width: 100%;
    gap: 6px;
  }

  .main-nav a,
  .main-nav a:visited {
    padding: 7px 12px;
    font-size: 0.88rem;
    background-color: var(--bg-alabaster);
    border: 1px solid var(--border-light);
  }

  .hero-title {
    font-size: 1.95rem;
  }

  .studio-grid-4,
  .faq-grid,
  .hub-grid,
  .sbs-compare-banner,
  .sitemap-list {
    grid-template-columns: 1fr;
  }

  .article-wrapper {
    padding: 28px 20px;
    margin: 24px auto 48px;
  }

  .article-header h1 {
    font-size: 1.65rem;
  }
}