/* ==========================================================================
   极客云 Airport Departure Lounge Theme Stylesheet
   Color Palette:
   - Primary Deep Aviation Blue: #23415A
   - Accent Muted Brass: #B89C6A
   - Accent Muted Brass Light: #D4AF37 / #C5A059
   - Background White: #FFFFFF
   - Background Mist: #E9F0F2
   - Text Primary: #1C2D37
   - Text Muted: #5A6E7C
   - Border Subtle: #D2DCE2
   ========================================================================== */

:root {
  --color-primary: #23415A;
  --color-primary-dark: #162B3D;
  --color-primary-light: #32587A;
  --color-brass: #B89C6A;
  --color-brass-hover: #9E8352;
  --color-brass-light: #F4EFE6;
  --color-white: #FFFFFF;
  --color-mist: #E9F0F2;
  --color-mist-light: #F4F8F9;
  --color-text-main: #1C2D37;
  --color-text-muted: #5A6E7C;
  --color-border: #D2DCE2;
  --color-success: #2A7B58;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", SimSun, serif;
  --container-max-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 2px 4px rgba(35, 65, 90, 0.05);
  --shadow-md: 0 6px 16px rgba(35, 65, 90, 0.08);
  --shadow-lg: 0 12px 32px rgba(35, 65, 90, 0.12);
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.68;
  color: var(--color-text-main);
  background-color: var(--color-white);
  overflow-x: hidden;
}

/* Headings & Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  color: var(--color-primary);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.01em;
}

h1 {
  font-size: 35px; /* Mobile H1 requirement */
}

@media (min-width: 1024px) {
  h1 {
    font-size: 54px; /* Desktop H1 requirement */
  }
}

h2 {
  font-size: 28px;
  margin-bottom: 1rem;
}

@media (min-width: 768px) {
  h2 { font-size: 36px; }
}

h3 {
  font-size: 20px;
  margin-bottom: 0.75rem;
}

@media (min-width: 768px) {
  h3 { font-size: 22px; }
}

p {
  margin-bottom: 1.25rem;
}

p.intro-serif, .hero-intro {
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--color-text-muted);
  line-height: 1.8;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: var(--transition);
}

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

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
}

.brand-icon {
  width: 32px;
  height: 32px;
  background-color: var(--color-primary);
  color: var(--color-brass);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-menu {
  display: none;
  gap: 24px;
  align-items: center;
  list-style: none;
}

@media (min-width: 768px) {
  .nav-menu {
    display: flex;
  }
}

.nav-link {
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text-main);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
}

.nav-link:hover, .nav-link.active {
  color: var(--color-brass);
  background-color: var(--color-mist);
}

.header-cta {
  display: none;
  gap: 12px;
}

@media (min-width: 1024px) {
  .header-cta {
    display: flex;
  }
}

/* Mobile Menu Button */
.mobile-toggle {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  width: 30px;
  height: 24px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 1100;
}

@media (min-width: 768px) {
  .mobile-toggle {
    display: none;
  }
}

.mobile-toggle span {
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 2px;
  transition: var(--transition);
}

.mobile-menu-overlay {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-white);
  padding: 24px 20px;
  flex-direction: column;
  gap: 20px;
  border-top: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
  z-index: 999;
}

.mobile-menu-overlay.is-active {
  display: flex;
}

.mobile-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.mobile-nav-link {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  display: block;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-mist);
}

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

.btn-primary {
  background-color: var(--color-brass);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: var(--color-brass-hover);
  color: var(--color-white);
  box-shadow: var(--shadow-sm);
}

.btn-secondary {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn-secondary:hover {
  background-color: var(--color-primary-dark);
  color: var(--color-white);
}

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

.btn-outline:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 14px;
}

.btn-block {
  width: 100%;
}

/* Hero Section */
.hero-section {
  padding: 48px 0 64px;
  background: linear-gradient(180deg, var(--color-mist-light) 0%, var(--color-white) 100%);
  border-bottom: 1px solid var(--color-border);
}

@media (min-width: 1024px) {
  .hero-section {
    padding: 80px 0 96px;
  }
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}

@media (min-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 48px;
  }
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background-color: var(--color-brass-light);
  color: var(--color-brass-hover);
  border: 1px solid rgba(184, 156, 106, 0.3);
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  width: fit-content;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 12px;
}

/* Airport Departure Display Dashboard (FIDS) */
.departure-board {
  background-color: var(--color-primary-dark);
  border: 2px solid var(--color-brass);
  border-radius: var(--radius-lg);
  padding: 24px;
  color: var(--color-white);
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.board-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(184, 156, 106, 0.3);
  padding-bottom: 12px;
  margin-bottom: 16px;
}

.board-title {
  font-family: monospace, var(--font-sans);
  font-size: 14px;
  letter-spacing: 2px;
  color: var(--color-brass);
  text-transform: uppercase;
}

.board-status-live {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: #52C41A;
}

.status-dot {
  width: 8px;
  height: 8px;
  background-color: #52C41A;
  border-radius: 50%;
}

.board-table {
  width: 100%;
  border-collapse: collapse;
}

.board-table th {
  text-align: left;
  font-size: 12px;
  color: var(--color-brass);
  padding: 8px 6px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  font-weight: 500;
}

.board-table td {
  padding: 12px 6px;
  font-size: 14px;
  font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.08);
}

.dest-city {
  font-weight: 700;
  color: var(--color-white);
}

.dest-code {
  color: var(--color-brass);
  font-size: 12px;
}

.status-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
  background-color: rgba(42, 123, 88, 0.2);
  color: #73D13D;
  border: 1px solid rgba(115, 209, 61, 0.3);
}

/* Subtle Route Animation Indicator */
.route-animation-box {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid rgba(184, 156, 106, 0.3);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.route-label {
  font-size: 12px;
  color: var(--color-text-muted);
}

.route-line-svg {
  width: 100%;
  height: 24px;
}

.pulse-dot {
  fill: var(--color-brass);
}

@media (prefers-reduced-motion: no-preference) {
  .pulse-dot {
    animation: routeTravel 3s infinite linear;
  }
}

@keyframes routeTravel {
  0% { transform: translateX(0); opacity: 0.3; }
  50% { opacity: 1; }
  100% { transform: translateX(200px); opacity: 0.3; }
}

/* Section Shared */
.section {
  padding: 64px 0;
}

@media (min-width: 1024px) {
  .section {
    padding: 96px 0;
  }
}

.section-alt {
  background-color: var(--color-mist);
}

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

.section-subtitle {
  color: var(--color-brass);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 8px;
  display: block;
}

/* Advantages Section: Three Distinct Horizontal Zones */
.advantages-zones {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.advantage-zone {
  display: grid;
  grid-template-columns: 1fr;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-left: 5px solid var(--color-brass);
  border-radius: var(--radius-md);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.advantage-zone:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

@media (min-width: 768px) {
  .advantage-zone {
    grid-template-columns: 80px 1fr;
    gap: 24px;
    align-items: center;
  }
}

.zone-num {
  font-size: 32px;
  font-weight: 800;
  color: var(--color-brass);
  font-family: SFMono-Regular, Consolas, monospace;
}

.zone-content h3 {
  color: var(--color-primary);
  margin-bottom: 8px;
}

.zone-content p {
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* Global Nodes Section */
.nodes-grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 20px;
}

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

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

.node-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  transition: var(--transition);
}

.node-card:hover {
  border-color: var(--color-brass);
  box-shadow: var(--shadow-sm);
}

.node-flag {
  font-size: 36px;
  margin-bottom: 12px;
}

.node-region {
  font-weight: 700;
  font-size: 18px;
  color: var(--color-primary);
  margin-bottom: 4px;
}

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

/* AI & Streaming Use Cases (Destination-style Panels) */
.usecases-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

@media (min-width: 1024px) {
  .usecases-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.panel-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.panel-title-badge {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 2px solid var(--color-mist);
  padding-bottom: 16px;
  margin-bottom: 24px;
}

.panel-title-badge h3 {
  margin-bottom: 0;
  font-size: 22px;
}

.panel-badge {
  background-color: var(--color-primary);
  color: var(--color-brass);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
}

.scenario-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.scenario-item {
  background-color: var(--color-mist-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px;
}

.scenario-name {
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.scenario-name::before {
  content: "•";
  color: var(--color-brass);
  font-size: 20px;
}

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

/* Pricing Tiers */
.pricing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 32px;
}

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

@media (min-width: 1100px) {
  .pricing-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.pricing-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
}

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

.pricing-card.featured {
  border: 2px solid var(--color-brass);
  box-shadow: var(--shadow-lg);
}

.badge-recommended {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-brass);
  color: var(--color-white);
  padding: 4px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1px;
}

.pricing-title {
  font-size: 20px;
  text-align: center;
  margin-bottom: 12px;
}

.pricing-price {
  text-align: center;
  margin-bottom: 20px;
}

.price-num {
  font-size: 36px;
  font-weight: 800;
  color: var(--color-primary);
}

.price-period {
  font-size: 14px;
  color: var(--color-text-muted);
}

.pricing-features {
  list-style: none;
  margin: 0 0 24px 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex-grow: 1;
}

.pricing-features li {
  font-size: 14px;
  color: var(--color-text-main);
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.pricing-features li::before {
  content: "✓";
  color: var(--color-brass);
  font-weight: 700;
}

.editorial-note {
  font-size: 12px;
  color: var(--color-text-muted);
  font-style: italic;
  margin-top: 6px;
  text-align: center;
}

/* SEO Article Cards (3 Desktop / 2 Tablet / 1 Mobile) */
.articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

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

@media (min-width: 1024px) {
  .articles-grid {
    grid-template-columns: repeat(3, 1fr); /* 3 Desktop */
  }
}

.article-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.article-card:hover {
  border-color: var(--color-brass);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.article-tag {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-brass);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.article-title {
  font-size: 18px;
  line-height: 1.4;
  margin-bottom: 12px;
}

.article-title a {
  color: var(--color-primary);
}

.article-title a:hover {
  color: var(--color-brass);
}

.article-excerpt {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 16px;
  flex-grow: 1;
}

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

/* Testimonials Section */
.testimonials-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

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

.testimonial-card {
  background-color: var(--color-mist-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.testimonial-text {
  font-size: 15px;
  color: var(--color-text-main);
  font-style: italic;
  margin-bottom: 0;
}

.testimonial-user {
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-avatar {
  width: 40px;
  height: 40px;
  background-color: var(--color-primary);
  color: var(--color-brass);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 16px;
}

.user-info {
  display: flex;
  flex-direction: column;
}

.user-name {
  font-weight: 700;
  font-size: 14px;
  color: var(--color-primary);
}

.user-role {
  font-size: 12px;
  color: var(--color-text-muted);
}

/* FAQ Section */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 840px;
  margin: 0 auto;
}

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

.faq-question {
  width: 100%;
  padding: 20px 24px;
  text-align: left;
  background: none;
  border: none;
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

.faq-answer {
  padding: 0 24px 20px;
  color: var(--color-text-muted);
  font-size: 15px;
  display: none;
}

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

.faq-icon {
  font-size: 20px;
  color: var(--color-brass);
  transition: var(--transition);
}

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

/* Footer */
.site-footer {
  background-color: var(--color-primary-dark);
  color: var(--color-mist);
  padding: 64px 0 32px;
  border-top: 3px solid var(--color-brass);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

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

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-brand .brand-logo {
  color: var(--color-white);
}

.footer-desc {
  font-size: 14px;
  color: #A0B2C6;
  max-width: 320px;
}

.footer-col h4 {
  color: var(--color-brass);
  font-size: 16px;
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: #A0B2C6;
  font-size: 14px;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
  font-size: 13px;
  color: #7E94A8;
  text-align: center;
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

/* Article & Content Page Specific Styles */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 24px;
}

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

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

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

.article-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.article-body {
  max-width: 820px;
  margin: 0 auto;
  font-size: 17px;
  line-height: 1.8;
  color: var(--color-text-main);
}

.article-body h2 {
  margin-top: 40px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-mist);
}

.article-body h3 {
  margin-top: 28px;
  margin-bottom: 12px;
}

.article-body ul, .article-body ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

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

.article-body blockquote {
  border-left: 4px solid var(--color-brass);
  background-color: var(--color-mist-light);
  padding: 16px 20px;
  margin: 24px 0;
  font-style: italic;
  color: var(--color-primary-dark);
}

.related-articles {
  margin-top: 64px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}