/* ==========================================================================
   Lilac-and-Basalt Product System Stylesheet
   Brand: Tomcat 机场 / Tomcat鏈哄満
   Palette: White #FFFFFF | Basalt #303039 | Pale Lilac #DDD9EC | Muted Violet #716B91
   ========================================================================== */

:root {
  --color-white: #FFFFFF;
  --color-basalt: #303039;
  --color-lilac-pale: #DDD9EC;
  --color-violet-muted: #716B91;
  --color-bg-light: #F8F7FC;
  --color-border: #DDD9EC;
  --color-border-dark: #303039;
  
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-serif: "Noto Serif SC", "Songti SC", "SimSun", STSong, serif;
  --font-mono: "SF Mono", Consolas, Monaco, "Courier New", monospace;

  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2.5rem;
  --spacing-xl: 4rem;

  --max-width: 1280px;
}

/* Base Reset & Typography */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 18px;
  scroll-behavior: smooth;
  background-color: var(--color-white);
  color: var(--color-basalt);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
}

body {
  font-size: 18px;
  line-height: 1.65;
  background-color: var(--color-white);
  color: var(--color-basalt);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Typography Elements */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  color: var(--color-basalt);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

h1 {
  font-size: 33px; /* Mobile first */
}

@media (min-width: 992px) {
  h1 {
    font-size: 47px; /* Desktop requirement */
  }
}

h2 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
}

h3 {
  font-size: 1.35rem;
  margin-bottom: 0.75rem;
}

p {
  margin-bottom: 1.2rem;
  color: var(--color-basalt);
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--color-basalt);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease;
}

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

/* Songti Serif Introductions */
.serif-intro {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: var(--color-violet-muted);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

/* Monospace Location & Index Labels */
.mono-label {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-violet-muted);
}

/* Sharp Corners System (No border-radius) */
.sharp-card,
.btn,
.nav-link,
.input-field,
.route-window,
.pricing-row,
.accordion-item,
.tag {
  border-radius: 0 !important;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.75rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid var(--color-basalt);
  background-color: var(--color-basalt);
  color: var(--color-white);
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  white-space: nowrap;
}

.btn:hover {
  background-color: var(--color-violet-muted);
  border-color: var(--color-violet-muted);
  color: var(--color-white);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-basalt);
  border: 1px solid var(--color-basalt);
}

.btn-secondary:hover {
  background-color: var(--color-lilac-pale);
  color: var(--color-basalt);
  border-color: var(--color-basalt);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-lilac-pale);
  padding: 1rem 0;
}

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

.brand-logo {
  font-family: var(--font-sans);
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-basalt);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.brand-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  background-color: var(--color-lilac-pale);
  color: var(--color-basalt);
  padding: 0.15rem 0.4rem;
  border: 1px solid var(--color-violet-muted);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-basalt);
  padding: 0.3rem 0;
  border-bottom: 2px solid transparent;
}

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

.header-cta {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Mobile Menu Toggle */
.mobile-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-basalt);
  padding: 0.5rem;
  cursor: pointer;
  color: var(--color-basalt);
}

.mobile-toggle svg {
  display: block;
  width: 24px;
  height: 24px;
  fill: currentColor;
}

@media (max-width: 868px) {
  .mobile-toggle {
    display: block;
  }
  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-basalt);
    flex-direction: column;
    padding: 1.5rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
  }
  .main-nav.is-open {
    display: flex;
  }
  .nav-links {
    flex-direction: column;
    width: 100%;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1rem;
  }
  .header-cta {
    width: 100%;
    flex-direction: column;
  }
  .header-cta .btn {
    width: 100%;
    text-align: center;
  }
}

/* Layout Modular Sections */
.section {
  padding: var(--spacing-xl) 0;
  border-bottom: 1px solid var(--color-lilac-pale);
}

.section-header {
  margin-bottom: var(--spacing-lg);
  max-width: 800px;
}

.section-tag {
  display: inline-block;
  margin-bottom: 0.75rem;
  padding: 0.2rem 0.6rem;
  background-color: var(--color-lilac-pale);
  border: 1px solid var(--color-violet-muted);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-basalt);
}

/* Hero Section */
.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  align-items: center;
}

@media (min-width: 992px) {
  .hero-grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: var(--spacing-xl);
  }
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}

/* Linked Vertical Route Windows (Hero Dashboard) */
.route-windows-container {
  border: 1px solid var(--color-basalt);
  background-color: var(--color-bg-light);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  box-shadow: 4px 4px 0px var(--color-lilac-pale);
}

.route-window-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

.route-windows-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.route-window {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  padding: 0.85rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: transform 0.2s ease, border-color 0.2s ease;
  animation: fadeInWindow 0.6s ease forwards;
  opacity: 0;
}

.route-window:nth-child(1) { animation-delay: 0.1s; }
.route-window:nth-child(2) { animation-delay: 0.2s; }
.route-window:nth-child(3) { animation-delay: 0.3s; }
.route-window:nth-child(4) { animation-delay: 0.4s; }

.route-window:hover {
  border-color: var(--color-basalt);
  transform: translateX(4px);
}

.route-location {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.route-flag {
  font-size: 1.2rem;
}

.route-name {
  font-weight: 600;
  font-size: 0.95rem;
}

.route-status-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.15rem 0.5rem;
  border: 1px solid var(--color-violet-muted);
  background-color: var(--color-lilac-pale);
  color: var(--color-basalt);
}

/* Animations */
@keyframes fadeInWindow {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .route-window {
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}

/* Benefits Section: 1 wide block + 2 narrow text sections */
.benefits-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 992px) {
  .benefits-grid {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.benefit-card {
  border: 1px solid var(--color-border);
  padding: 2rem;
  background-color: var(--color-white);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.benefit-card.wide-card {
  background-color: var(--color-bg-light);
  border: 1px solid var(--color-basalt);
}

.benefit-card h3 {
  font-size: 1.4rem;
  margin-bottom: 1rem;
}

/* Segmented Global Nodes Band */
.nodes-band-container {
  border: 1px solid var(--color-basalt);
  background-color: var(--color-white);
}

.nodes-segmented-bar {
  display: flex;
  border-bottom: 1px solid var(--color-basalt);
  background-color: var(--color-bg-light);
  overflow-x: auto;
}

.node-segment-btn {
  padding: 1rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  border: none;
  border-right: 1px solid var(--color-border);
  background: transparent;
  cursor: pointer;
  color: var(--color-basalt);
  white-space: nowrap;
}

.node-segment-btn.active, .node-segment-btn:hover {
  background-color: var(--color-white);
  color: var(--color-basalt);
  font-weight: 700;
  border-bottom: 2px solid var(--color-violet-muted);
}

.nodes-display-panel {
  padding: 2rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.node-info-box {
  border: 1px solid var(--color-border);
  padding: 1.25rem;
  background-color: var(--color-bg-light);
}

/* AI & Streaming Storytelling Sections (Full Width) */
.storytelling-block {
  border: 1px solid var(--color-basalt);
  padding: 2.5rem;
  margin-bottom: 2rem;
  background-color: var(--color-white);
}

.storytelling-block:last-child {
  margin-bottom: 0;
}

.storytelling-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 1rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.tools-pills-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.tool-pill {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.3rem 0.75rem;
  border: 1px solid var(--color-violet-muted);
  background-color: var(--color-lilac-pale);
  color: var(--color-basalt);
}

/* Pricing Section - Crisp Rows */
.pricing-table-container {
  border: 1px solid var(--color-basalt);
  overflow-x: auto;
}

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

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

.pricing-table th {
  background-color: var(--color-bg-light);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-violet-muted);
  border-bottom: 1px solid var(--color-basalt);
}

.pricing-table tr:hover {
  background-color: #FAF9FE;
}

.price-tag {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-basalt);
}

.placeholder-notice {
  font-size: 0.85rem;
  color: var(--color-violet-muted);
  font-family: var(--font-mono);
  background-color: var(--color-lilac-pale);
  padding: 0.25rem 0.5rem;
  display: inline-block;
  margin-top: 0.25rem;
}

/* Articles Cards Grid - 3 Desktop / 2 Tablet / 1 Mobile */
.articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 992px) {
  .articles-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.article-card {
  border: 1px solid var(--color-border);
  padding: 1.75rem;
  background-color: var(--color-white);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.article-card:hover {
  border-color: var(--color-basalt);
  transform: translateY(-2px);
}

.article-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.article-index {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-violet-muted);
}

.article-card h3 {
  font-size: 1.2rem;
  line-height: 1.35;
  margin-bottom: 0.75rem;
}

.article-excerpt {
  font-size: 0.95rem;
  color: var(--color-basalt);
  margin-bottom: 1.25rem;
  line-height: 1.5;
}

.article-meta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-violet-muted);
  display: flex;
  justify-content: space-between;
  border-top: 1px solid var(--color-border);
  padding-top: 0.75rem;
}

/* Testimonials */
.testimonials-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .testimonials-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.testimonial-card {
  border: 1px solid var(--color-border);
  padding: 1.5rem;
  background-color: var(--color-bg-light);
}

.testimonial-author {
  margin-top: 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-violet-muted);
  border-top: 1px solid var(--color-border);
  padding-top: 0.5rem;
}

/* FAQ Accordion */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 900px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--color-border);
  background-color: var(--color-white);
}

.faq-button {
  width: 100%;
  padding: 1.25rem 1.5rem;
  text-align: left;
  background: none;
  border: none;
  font-family: var(--font-sans);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-basalt);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.faq-button:hover {
  background-color: var(--color-bg-light);
}

.faq-icon {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  transition: transform 0.2s ease;
}

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

.faq-answer {
  display: none;
  padding: 0 1.5rem 1.25rem 1.5rem;
  font-size: 0.95rem;
  color: var(--color-basalt);
  border-top: 1px dashed var(--color-border);
  margin-top: 0.5rem;
  padding-top: 1rem;
}

.faq-item.is-open .faq-answer {
  display: block;
}

/* Breadcrumbs */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-violet-muted);
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

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

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

.breadcrumb-separator {
  color: var(--color-border);
}

/* Article Content Detail Layout */
.article-detail-container {
  max-width: 860px;
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-md);
}

.article-header {
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 1.5rem;
}

.article-body {
  font-size: 1.05rem;
  line-height: 1.8;
}

.article-body h2 {
  font-size: 1.6rem;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  border-left: 4px solid var(--color-violet-muted);
  padding-left: 0.75rem;
}

.article-body h3 {
  font-size: 1.25rem;
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
}

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

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

.article-body blockquote {
  border-left: 3px solid var(--color-basalt);
  background-color: var(--color-bg-light);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  font-family: var(--font-serif);
  color: var(--color-violet-muted);
}

.related-articles-box {
  margin-top: 3rem;
  border: 1px solid var(--color-basalt);
  padding: 1.75rem;
  background-color: var(--color-bg-light);
}

/* Auxiliary Pages Layout */
.page-container {
  max-width: 960px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
}

/* Site Footer */
.site-footer {
  background-color: var(--color-basalt);
  color: var(--color-white);
  padding: var(--spacing-xl) 0 2rem 0;
  margin-top: auto;
  border-top: 1px solid var(--color-basalt);
}

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

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
}

.footer-col h4 {
  color: var(--color-lilac-pale);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-links a {
  color: var(--color-lilac-pale);
  font-size: 0.9rem;
}

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

.footer-bottom {
  border-top: 1px solid rgba(221, 217, 236, 0.2);
  padding-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--color-lilac-pale);
  font-family: var(--font-mono);
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
  }
}

/* Table Utilities */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
}

.data-table th, .data-table td {
  border: 1px solid var(--color-border);
  padding: 0.75rem 1rem;
  text-align: left;
}

.data-table th {
  background-color: var(--color-bg-light);
  font-family: var(--font-mono);
  font-size: 0.85rem;
}