/* ==========================================================================
   奈云 (Naiyun) Premium Editorial Design System
   Visual Palette: Warm White (#F6F4EE), Brown Pink (#3D2B28), Royal Blue (#3157E1),
   Coral Orange (#F27457), Soft Mint (#BFE3D0), Charcoal (#17202A), Slate Gray (#667085)
   ========================================================================== */

:root {
  --color-bg-warm: #F6F4EE;
  --color-bg-dark: #3D2B28;
  --color-bg-card-dark: #4A3531;
  --color-accent-blue: #3157E1;
  --color-accent-coral: #F27457;
  --color-accent-mint: #BFE3D0;
  --color-text-main: #17202A;
  --color-text-muted: #667085;
  --color-text-light: #F6F4EE;
  --color-border: #E2DEC9;
  --color-border-dark: rgba(255, 255, 255, 0.15);

  --font-serif: "Georgia", "Times New Roman", serif;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  background-color: var(--color-bg-warm);
  color: var(--color-text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  overflow-x: hidden;
  background-color: var(--color-bg-warm);
  color: var(--color-text-main);
}

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

/* 容器与版心 */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* 编辑风标题与字号 */
.editorial-kicker {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent-blue);
  margin-bottom: 0.75rem;
  display: inline-block;
  font-weight: 600;
}

.section-header {
  margin-bottom: 3.5rem;
}

.section-header h2 {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--color-text-main);
  line-height: 1.25;
}

.section-header p {
  color: var(--color-text-muted);
  font-size: 1.1rem;
  margin-top: 0.75rem;
  max-width: 640px;
}

/* 按钮规范 (规则矩形与精细线条，非夸张圆角) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.85rem 1.75rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 4px;
  transition: var(--transition-normal);
  cursor: pointer;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-accent-blue);
  color: #ffffff;
  border-color: var(--color-accent-blue);
}

.btn-primary:hover {
  background-color: #2444b8;
  border-color: #2444b8;
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-text-main);
  border-color: var(--color-text-main);
}

.btn-secondary:hover {
  background-color: var(--color-text-main);
  color: var(--color-bg-warm);
}

.btn-dark {
  background-color: var(--color-accent-coral);
  color: #ffffff;
  border-color: var(--color-accent-coral);
}

.btn-dark:hover {
  background-color: #e05c3e;
  border-color: #e05c3e;
}

/* 1. Header 导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(246, 244, 238, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}

.site-logo {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.site-logo span.tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  background-color: var(--color-accent-mint);
  color: var(--color-text-main);
  padding: 0.15rem 0.4rem;
  border-radius: 2px;
}

.site-nav {
  display: none;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.site-nav a {
  font-size: 0.925rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: var(--transition-fast);
}

.site-nav a:hover {
  color: var(--color-accent-blue);
}

/* 2. Editorial Hero (Asymmetrical Split) */
.hero-section {
  padding: 5rem 0 4.5rem;
  border-bottom: 1px solid var(--color-border);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-left h1 {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--color-text-main);
  margin-bottom: 1.25rem;
}

.hero-left h1 .highlight {
  color: var(--color-accent-blue);
  font-style: italic;
  font-family: var(--font-serif);
  font-weight: 700;
}

.hero-left p.desc {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 2.25rem;
  max-width: 540px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.hero-highlights-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.highlight-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 500;
}

.highlight-item svg {
  color: var(--color-accent-blue);
}

/* Hero Right Abstract Connection Artwork */
.hero-right-artwork {
  border: 1px solid var(--color-border);
  background-color: #ffffff;
  padding: 2.25rem;
  border-radius: 4px;
  position: relative;
}

.artwork-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
  display: flex;
  justify-content: space-between;
}

/* 3. Service Overview (Bento Grid) */
.bento-section {
  padding: 5.5rem 0;
}

.bento-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.bento-card {
  background-color: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition-normal);
}

.bento-card:hover {
  border-color: var(--color-accent-blue);
}

.bento-card.dark-block {
  background-color: var(--color-bg-dark);
  color: var(--color-text-light);
  border-color: var(--color-bg-dark);
}

.bento-card .bento-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-accent-blue);
  text-transform: uppercase;
  margin-bottom: 1rem;
  font-weight: 600;
}

.bento-card.dark-block .bento-tag {
  color: var(--color-accent-coral);
}

.bento-card h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.bento-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.bento-card.dark-block p {
  color: #D0C5C2;
}

/* 4. Global Network Routes (Map Visualization) */
.routes-section {
  padding: 5.5rem 0;
  background-color: var(--color-bg-dark);
  color: var(--color-text-light);
  border-y: 1px solid var(--color-border-dark);
}

.routes-section .section-header h2 {
  color: var(--color-text-light);
}

.routes-section .section-header p {
  color: #D0C5C2;
}

.map-container {
  border: 1px solid var(--color-border-dark);
  background-color: var(--color-bg-card-dark);
  border-radius: 4px;
  padding: 2rem;
  margin-bottom: 2rem;
}

.nodes-metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
}

.metric-box {
  border: 1px solid var(--color-border-dark);
  padding: 1.25rem;
  border-radius: 4px;
  background-color: rgba(0, 0, 0, 0.15);
}

.metric-label {
  font-size: 0.85rem;
  color: #D0C5C2;
  margin-bottom: 0.3rem;
}

.metric-val {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-accent-mint);
  font-family: var(--font-mono);
}

/* 5. Choose by Use Case */
.usecase-section {
  padding: 5.5rem 0;
}

.usecase-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.usecase-card {
  background-color: #ffffff;
  border: 1px solid var(--color-border);
  padding: 1.75rem;
  border-radius: 4px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition-normal);
}

.usecase-card:hover {
  border-color: var(--color-accent-blue);
  transform: translateY(-2px);
}

.usecase-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.usecase-desc {
  font-size: 0.925rem;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
  line-height: 1.6;
}

.usecase-target {
  font-family: var(--font-mono);
  font-size: 0.825rem;
  color: var(--color-accent-blue);
  font-weight: 600;
}

/* 6. Pricing Comparison Table */
.pricing-section {
  padding: 5.5rem 0;
}

.pricing-table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  background-color: #ffffff;
  border-radius: 4px;
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 680px;
}

.pricing-table th, .pricing-table td {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.95rem;
}

.pricing-table th {
  background-color: #FAF8F3;
  font-weight: 700;
  font-size: 1.05rem;
}

.pricing-table th.popular-col {
  background-color: rgba(49, 87, 225, 0.06);
  border-top: 3px solid var(--color-accent-blue);
}

.pricing-table td.popular-col {
  background-color: rgba(49, 87, 225, 0.03);
}

.pricing-table tr:last-child td {
  border-bottom: none;
}

.price-num {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-text-main);
  font-family: var(--font-mono);
}

/* 7. Setup Process */
.setup-section {
  padding: 5.5rem 0;
  border-top: 1px solid var(--color-border);
}

.setup-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.setup-step {
  background-color: #ffffff;
  border: 1px solid var(--color-border);
  padding: 2rem;
  border-radius: 4px;
  position: relative;
}

.step-num {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-accent-coral);
  margin-bottom: 0.75rem;
}

.setup-step h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.setup-step p {
  color: var(--color-text-muted);
  font-size: 0.925rem;
}

.os-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.os-link-btn {
  font-size: 0.85rem;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--color-border);
  border-radius: 3px;
  color: var(--color-accent-blue);
  font-weight: 600;
}

/* 8. Compatibility Section */
.compat-section {
  padding: 5.5rem 0;
  background-color: #FAF8F3;
  border-y: 1px solid var(--color-border);
}

.compat-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.compat-category h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

.compat-items {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.compat-pill {
  background-color: #ffffff;
  border: 1px solid var(--color-border);
  padding: 0.5rem 1rem;
  border-radius: 3px;
  font-size: 0.9rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.compat-pill svg {
  width: 1.1rem;
  height: 1.1rem;
  color: var(--color-text-main);
}

/* 9. Knowledge Center */
.knowledge-section {
  padding: 5.5rem 0;
}

.knowledge-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.knowledge-card {
  background-color: #ffffff;
  border: 1px solid var(--color-border);
  padding: 1.85rem;
  border-radius: 4px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition-normal);
}

.knowledge-card:hover {
  border-color: var(--color-accent-blue);
}

.knowledge-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  line-height: 1.4;
}

.knowledge-card p {
  color: var(--color-text-muted);
  font-size: 0.925rem;
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

/* 10. FAQ Accordion */
.faq-section {
  padding: 5.5rem 0;
  border-top: 1px solid var(--color-border);
}

.faq-accordion {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background-color: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  overflow: hidden;
}

.faq-summary {
  padding: 1.25rem 1.5rem;
  font-weight: 600;
  font-size: 1.05rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.faq-content {
  padding: 0 1.5rem 1.25rem;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
  border-top: 1px solid var(--color-border);
  margin-top: 0.5rem;
  padding-top: 1rem;
}

/* 11. Final Call to Action */
.final-cta-section {
  padding: 6rem 0;
  background-color: var(--color-bg-dark);
  color: var(--color-text-light);
  text-align: center;
}

.final-cta-box {
  max-width: 680px;
  margin: 0 auto;
}

.final-cta-box h2 {
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.final-cta-box p {
  color: #D0C5C2;
  font-size: 1.1rem;
  margin-bottom: 2.25rem;
}

/* 12. Footer */
.site-footer {
  background-color: #2D1F1C;
  color: #D0C5C2;
  padding: 4rem 0 3rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer-nav-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem 2.5rem;
}

.footer-nav-list a {
  color: #F6F4EE;
  font-weight: 500;
  transition: var(--transition-fast);
}

.footer-nav-list a:hover {
  color: var(--color-accent-coral);
}

.footer-pbn-box {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-pbn-box a {
  color: var(--color-accent-mint);
  font-weight: 600;
  margin: 0 0.5rem;
  text-decoration: underline;
}

/* 响应式媒体查询 (Tablet & Desktop Layouts) */
@media (min-width: 768px) {
  .site-nav {
    display: flex;
  }

  .hero-grid {
    grid-template-columns: 1.1fr 0.9fr;
  }

  .hero-left h1 {
    font-size: 3.25rem;
  }

  .bento-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .bento-card.wide {
    grid-column: span 2;
  }

  .usecase-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .setup-steps {
    grid-template-columns: repeat(4, 1fr);
  }

  .compat-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .knowledge-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1.5fr 2.5fr;
  }
}

@media (min-width: 1024px) {
  .knowledge-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}