/* 
   xlcjiasuqi.click - Style System
   Theme: Indigo Glassboard on Bright Background
   Colors:
   - Primary Dark Indigo: #2B3561
   - Muted Aquamarine: #78AEB0
   - Pale Indigo: #ECEEFA
   - Pure White: #FFFFFF
   - Background Tint: #F8F9FD
*/

:root {
  --color-white: #FFFFFF;
  --color-dark-indigo: #2B3561;
  --color-muted-aquamarine: #78AEB0;
  --color-pale-indigo: #ECEEFA;
  --color-bg: #F8F9FD;
  --color-text-main: #2B3561;
  --color-text-muted: #525E8A;
  --color-border: rgba(43, 53, 97, 0.12);
  --color-card-bg: rgba(255, 255, 255, 0.9);
  --color-glass-bg: rgba(236, 238, 250, 0.65);
  
  --font-heading: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;

  --max-width: 1200px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --shadow-subtle: 0 4px 20px rgba(43, 53, 97, 0.06);
  --shadow-hover: 0 8px 30px rgba(43, 53, 97, 0.12);
}

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

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

body {
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1.65;
  color: var(--color-text-main);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Accessibility Skip Link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 10px;
  background: var(--color-dark-indigo);
  color: var(--color-white);
  padding: 8px 16px;
  z-index: 1000;
  text-decoration: none;
  border-radius: 4px;
  transition: top 0.2s ease;
}
.skip-link:focus {
  top: 10px;
}

/* Typography Defaults */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-dark-indigo);
  font-weight: 700;
  line-height: 1.25;
}

h1 {
  font-size: 55px;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 32px;
  margin-bottom: 1rem;
}

h3 {
  font-size: 22px;
  margin-bottom: 0.75rem;
}

p {
  margin-bottom: 1rem;
}

a {
  color: var(--color-dark-indigo);
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

a:hover {
  color: var(--color-muted-aquamarine);
}

/* Layout Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 900;
  background-color: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--color-pale-indigo);
  backdrop-filter: blur(8px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.site-logo {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 800;
  color: var(--color-dark-indigo);
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-badge {
  background: var(--color-pale-indigo);
  color: var(--color-dark-indigo);
  font-size: 12px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid var(--color-muted-aquamarine);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  font-weight: 600;
  font-size: 16px;
  color: var(--color-dark-indigo);
}

.nav-link:hover, .nav-link.active {
  color: var(--color-muted-aquamarine);
}

.header-cta {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 16px;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.25s ease;
  text-align: center;
}

.btn-primary {
  background-color: var(--color-dark-indigo);
  color: var(--color-white);
  border-color: var(--color-dark-indigo);
  box-shadow: 0 4px 12px rgba(43, 53, 97, 0.15);
}

.btn-primary:hover {
  background-color: #1e2648;
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(43, 53, 97, 0.25);
}

.btn-secondary {
  background-color: var(--color-pale-indigo);
  color: var(--color-dark-indigo);
  border-color: var(--color-pale-indigo);
}

.btn-secondary:hover {
  background-color: #dfdff5;
  color: var(--color-dark-indigo);
  transform: translateY(-2px);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-dark-indigo);
  border-color: var(--color-dark-indigo);
}

.btn-outline:hover {
  background-color: var(--color-pale-indigo);
}

/* Mobile Toggle */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--color-dark-indigo);
  font-size: 24px;
}

/* Hero Section */
.hero-section {
  padding: 64px 0 80px;
  position: relative;
  background: linear-gradient(180deg, #FFFFFF 0%, var(--color-bg) 100%);
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero-content {
  max-width: 620px;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: var(--color-pale-indigo);
  color: var(--color-dark-indigo);
  font-size: 14px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 20px;
  margin-bottom: 20px;
  border: 1px solid rgba(120, 174, 176, 0.4);
}

.hero-title {
  margin-bottom: 20px;
}

.hero-desc {
  font-size: 18px;
  color: var(--color-text-muted);
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* Hero Glassboard Visual */
.glassboard-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-pale-indigo);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-subtle);
  position: relative;
  overflow: hidden;
}

.board-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 16px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--color-pale-indigo);
}

.board-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-dark-indigo);
  display: flex;
  align-items: center;
  gap: 8px;
}

.board-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: #2e7d32;
  background: rgba(46, 125, 50, 0.08);
  padding: 4px 10px;
  border-radius: 12px;
  font-weight: 600;
}

.board-status-dot {
  width: 8px;
  height: 8px;
  background-color: #2e7d32;
  border-radius: 50%;
}

.board-layers {
  display: flex;
  flex-direction: column;
  gap: 14px;
  position: relative;
}

.route-layer {
  background: var(--color-glass-bg);
  border: 1px solid rgba(43, 53, 97, 0.08);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  z-index: 2;
}

.route-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.route-node {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 15px;
  color: var(--color-dark-indigo);
}

.route-arrow {
  color: var(--color-muted-aquamarine);
  font-weight: bold;
}

.route-protocol {
  font-size: 12px;
  font-weight: 600;
  background: var(--color-white);
  color: var(--color-dark-indigo);
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid var(--color-pale-indigo);
}

.route-line-svg {
  width: 100%;
  height: 60px;
  margin-top: 10px;
}

/* Sweep Animation on Board */
.sweep-line {
  stroke-dasharray: 10, 100;
  animation: lineSweep 4s linear infinite;
}

@keyframes lineSweep {
  0% {
    stroke-dashoffset: 110;
  }
  100% {
    stroke-dashoffset: -110;
  }
}

@media (prefers-reduced-motion: reduce) {
  .sweep-line {
    animation: none;
  }
}

/* Section Header */
.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 48px;
}

.section-subtitle {
  color: var(--color-muted-aquamarine);
  font-size: 15px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
  display: block;
}

.section-title {
  font-size: 32px;
  margin-bottom: 12px;
}

.section-desc {
  color: var(--color-text-muted);
  font-size: 17px;
}

/* Advantages Section: Asymmetric 2+1 Layout */
.advantages-section {
  padding: 80px 0;
  background-color: var(--color-white);
}

.advantages-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.advantage-card {
  background: var(--color-bg);
  border: 1px solid var(--color-pale-indigo);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.advantage-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.advantage-card.wide-card {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, var(--color-pale-indigo) 0%, #FFFFFF 100%);
  display: flex;
  align-items: center;
  gap: 32px;
}

.advantage-icon {
  width: 52px;
  height: 52px;
  background: var(--color-white);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-dark-indigo);
  font-size: 24px;
  margin-bottom: 20px;
  box-shadow: 0 4px 10px rgba(43, 53, 97, 0.05);
  border: 1px solid var(--color-pale-indigo);
}

.wide-card .advantage-icon {
  margin-bottom: 0;
  flex-shrink: 0;
  width: 64px;
  height: 64px;
  font-size: 28px;
}

/* Global Nodes Section: Route Ribbon */
.nodes-section {
  padding: 80px 0;
  background: var(--color-bg);
}

.nodes-ribbon-container {
  background: var(--color-white);
  border: 1px solid var(--color-pale-indigo);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-subtle);
}

.nodes-disclaimer {
  font-size: 14px;
  color: var(--color-text-muted);
  background: var(--color-pale-indigo);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  margin-bottom: 28px;
  text-align: center;
}

.ribbon-flex {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: space-between;
}

.node-ribbon-item {
  flex: 1 1 220px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-dark-indigo);
  border-radius: var(--radius-md);
  padding: 20px;
}

.node-ribbon-item.featured {
  border-left-color: var(--color-muted-aquamarine);
}

.node-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.node-flag {
  font-size: 20px;
}

.node-title {
  font-weight: 700;
  font-size: 17px;
  color: var(--color-dark-indigo);
}

.node-desc {
  font-size: 14px;
  color: var(--color-text-muted);
  margin: 0;
}

/* AI & Streaming Use Cases: Large Contrasting Panels */
.usecases-section {
  padding: 80px 0;
  background: var(--color-white);
}

.usecases-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.usecase-panel {
  border-radius: var(--radius-lg);
  padding: 40px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.panel-ai {
  background: var(--color-dark-indigo);
  color: var(--color-white);
}

.panel-ai h3, .panel-ai h2 {
  color: var(--color-white);
}

.panel-ai .usecase-tag {
  background: rgba(255, 255, 255, 0.15);
  color: var(--color-pale-indigo);
}

.panel-ai p {
  color: #D2D8F2;
}

.panel-streaming {
  background: var(--color-pale-indigo);
  color: var(--color-dark-indigo);
  border: 1px solid rgba(120, 174, 176, 0.4);
}

.panel-streaming .usecase-tag {
  background: var(--color-white);
  color: var(--color-dark-indigo);
}

.usecase-tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 12px;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 16px;
  width: fit-content;
}

.scenarios-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.scenario-pill {
  background: rgba(255, 255, 255, 0.2);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
}

.panel-streaming .scenario-pill {
  background: var(--color-white);
  border: 1px solid var(--color-border);
}

/* Pricing Section: Precise Table */
.pricing-section {
  padding: 80px 0;
  background: var(--color-bg);
}

.pricing-table-wrapper {
  background: var(--color-white);
  border: 1px solid var(--color-pale-indigo);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-subtle);
  overflow-x: auto;
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 640px;
}

.pricing-table th, .pricing-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-pale-indigo);
}

.pricing-table th {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-dark-indigo);
  background-color: var(--color-bg);
}

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

.editorial-note {
  font-size: 13px;
  color: var(--color-text-muted);
  font-style: italic;
}

.placeholder-badge {
  display: inline-block;
  font-size: 12px;
  background: #FFF3CD;
  color: #856404;
  padding: 2px 8px;
  border-radius: 4px;
}

.badge-recommended {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  background-color: var(--color-dark-indigo);
  color: var(--color-white);
  padding: 3px 10px;
  border-radius: 12px;
  margin-left: 6px;
  vertical-align: middle;
  box-shadow: 0 2px 6px rgba(43, 53, 97, 0.2);
}

.pricing-table tr.recommended-row {
  background-color: rgba(236, 238, 250, 0.45);
}

.price-text {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 800;
  color: var(--color-dark-indigo);
}



/* Articles Section: 3 / 2 / 1 Grid */
.articles-section {
  padding: 80px 0;
  background: var(--color-white);
}

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

.article-card {
  background: var(--color-bg);
  border: 1px solid var(--color-pale-indigo);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-muted-aquamarine);
  box-shadow: var(--shadow-subtle);
}

.article-category {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-muted-aquamarine);
  text-transform: uppercase;
  margin-bottom: 8px;
  display: block;
}

.article-card-title {
  font-size: 19px;
  margin-bottom: 12px;
  line-height: 1.4;
}

.article-card-title a {
  color: var(--color-dark-indigo);
}

.article-card-title a:hover {
  color: var(--color-muted-aquamarine);
}

.article-excerpt {
  font-size: 15px;
  color: var(--color-text-muted);
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-meta {
  font-size: 13px;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--color-pale-indigo);
  padding-top: 12px;
}

/* Testimonials Section */
.testimonials-section {
  padding: 80px 0;
  background: var(--color-bg);
}

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

.testimonial-card {
  background: var(--color-white);
  border: 1px solid var(--color-pale-indigo);
  border-radius: var(--radius-md);
  padding: 24px;
}

.sample-badge {
  display: inline-block;
  font-size: 11px;
  background: var(--color-pale-indigo);
  color: var(--color-dark-indigo);
  padding: 2px 6px;
  border-radius: 4px;
  margin-bottom: 12px;
  font-weight: 600;
}

.testimonial-text {
  font-size: 15px;
  color: var(--color-text-main);
  margin-bottom: 16px;
  font-style: italic;
}

.testimonial-author {
  font-weight: 700;
  font-size: 14px;
  color: var(--color-dark-indigo);
}

/* FAQ Accordion Section */
.faq-section {
  padding: 80px 0;
  background: var(--color-white);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  border: 1px solid var(--color-pale-indigo);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 20px 24px;
  background: none;
  border: none;
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 700;
  color: var(--color-dark-indigo);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

.faq-icon {
  font-size: 20px;
  transition: transform 0.3s ease;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 24px;
  color: var(--color-text-muted);
  font-size: 16px;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding: 0 24px 20px 24px;
}

/* Article Page Layout */
.article-page-header {
  padding: 48px 0 32px;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-pale-indigo);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.breadcrumb a {
  color: var(--color-text-muted);
}

.breadcrumb a:hover {
  color: var(--color-muted-aquamarine);
}

.article-container {
  padding: 48px 0 80px;
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
}

.article-body {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 40px;
  border: 1px solid var(--color-pale-indigo);
}

.article-body h2 {
  margin-top: 2rem;
  margin-bottom: 1rem;
  border-bottom: 2px solid var(--color-pale-indigo);
  padding-bottom: 8px;
}

.article-body h3 {
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

.article-body ul, .article-body ol {
  margin-left: 1.5rem;
  margin-bottom: 1.25rem;
}

.article-body li {
  margin-bottom: 0.5rem;
}

.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-widget {
  background: var(--color-white);
  border: 1px solid var(--color-pale-indigo);
  border-radius: var(--radius-md);
  padding: 24px;
}

/* Footer Section */
.site-footer {
  background-color: var(--color-dark-indigo);
  color: var(--color-pale-indigo);
  padding: 64px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-col h4 {
  color: var(--color-white);
  font-size: 18px;
  margin-bottom: 20px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  color: #D2D8F2;
  font-size: 15px;
}

.footer-links a:hover {
  color: var(--color-white);
}

.footer-bottom {
  border-top: 1px solid rgba(236, 238, 250, 0.15);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 14px;
  color: #A0A8CF;
  flex-wrap: wrap;
  gap: 16px;
}

/* Responsive Styles */
@media (max-width: 1024px) {
  h1 {
    font-size: 44px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

  .article-container {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  h1 {
    font-size: 36px;
  }

  h2 {
    font-size: 26px;
  }

  body {
    font-size: 16px;
  }

  .mobile-menu-btn {
    display: block;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background-color: var(--color-white);
    flex-direction: column;
    padding: 24px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    border-bottom: 1px solid var(--color-pale-indigo);
    gap: 16px;
  }

  .nav-menu.is-open {
    display: flex;
  }

  .advantages-grid {
    grid-template-columns: 1fr;
  }

  .advantage-card.wide-card {
    flex-direction: column;
    align-items: flex-start;
  }

  .usecases-grid {
    grid-template-columns: 1fr;
  }

  .articles-grid {
    grid-template-columns: 1fr;
  }

  .testimonials-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 430px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions .btn {
    width: 100%;
  }
}