/* ==========================================================================
   XSUS AIRPORT (XSUS机场) — Warm Editorial Travel Document Aesthetic
   Palette: Paper White #F6F1E7 | Ink Black #1C1917 | Cinnabar #D6482B
   Typography: Fraunces (600-900, high opsz) & Space Grotesk (400/500)
   ========================================================================== */

:root {
  --bg-paper: #F6F1E7;
  --bg-paper-tint: #EFE8DA;
  --ink: #1C1917;
  --ink-muted: #4A443F;
  --cinnabar: #D6482B;
  --font-serif: 'Fraunces', 'Noto Serif SC', 'Songti SC', Georgia, serif;
  --font-sans: 'Space Grotesk', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --border-ink: 1px solid #1C1917;
  --border-dashed: 1px dashed #1C1917;
  --max-width: 1160px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-paper);
  color: var(--ink);
}

body {
  font-family: var(--font-sans);
  font-weight: 400;
  background-color: var(--bg-paper);
  color: var(--ink);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* Typography Rules */
h1, h2, h3, h4, .serif-num, .price-num, .time-num {
  font-family: var(--font-serif);
  font-variation-settings: "opsz" 144;
  color: var(--ink);
}

h1 {
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

h2 {
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -0.015em;
}

h3 {
  font-weight: 700;
  line-height: 1.3;
}

a {
  color: var(--cinnabar);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
  transition: color 0.2s ease, background-color 0.2s ease;
}

a:hover {
  color: var(--ink);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 28px;
}

/* Editorial Document Top Ledger Strip */
.ledger-strip {
  border-bottom: var(--border-ink);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 8px 0;
  background-color: var(--bg-paper);
}

.ledger-strip-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.ledger-serial {
  font-family: var(--font-serif);
  font-weight: 600;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-paper);
  border-bottom: var(--border-ink);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 84px;
  gap: 24px;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  color: var(--ink);
}

.brand-mark:hover {
  color: var(--ink);
}

.postmark-logo {
  width: 58px;
  height: 58px;
  flex-shrink: 0;
  transform: rotate(-8deg);
  transition: transform 0.25s ease;
}

.brand-mark:hover .postmark-logo {
  transform: rotate(0deg);
}

.brand-text-group {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: 0.01em;
  line-height: 1.1;
  color: var(--ink);
}

.brand-sub {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-top: 3px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--ink);
  text-decoration: none;
  padding: 6px 2px;
  position: relative;
}

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

.nav-link-dispatch {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: var(--border-ink);
  font-weight: 500;
}

.nav-stamp-dot {
  width: 6px;
  height: 6px;
  background-color: var(--cinnabar);
  border-radius: 50%;
  display: inline-block;
}

/* Buttons — Hover fills Cinnabar #D6482B, text turns Paper White #F6F1E7 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 13px 26px;
  border: var(--border-ink);
  background-color: var(--bg-paper);
  color: var(--ink);
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
  letter-spacing: 0.02em;
}

.btn-primary {
  background-color: var(--cinnabar);
  color: var(--bg-paper);
  border-color: var(--ink);
}

.btn:hover,
.btn-primary:hover,
.btn-outline:hover {
  background-color: var(--cinnabar);
  color: var(--bg-paper);
  border-color: var(--ink);
}

.btn-sm {
  padding: 9px 18px;
  font-size: 0.86rem;
}

/* Ticket Perforation Divider with Punch Holes */
.ticket-divider {
  position: relative;
  border-top: var(--border-dashed);
  margin: 0;
  height: 1px;
}

.ticket-divider::before,
.ticket-divider::after {
  content: "";
  position: absolute;
  top: -11px;
  width: 22px;
  height: 22px;
  background-color: var(--bg-paper);
  border: var(--border-ink);
  border-radius: 50%;
}

.ticket-divider::before {
  left: -12px;
}

.ticket-divider::after {
  right: -12px;
}

/* Stamp Component */
.stamp-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--cinnabar);
  color: var(--cinnabar);
  padding: 4px 12px;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transform: rotate(-1.5deg);
  background-color: var(--bg-paper);
}

/* Hero Section — Travel Document / Boarding Pass Spread */
.hero-section {
  padding: 76px 0 84px;
  border-bottom: var(--border-ink);
}

.hero-passport-frame {
  border: var(--border-ink);
  background-color: var(--bg-paper);
  position: relative;
}

.hero-top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 28px;
  border-bottom: var(--border-ink);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background-color: var(--bg-paper-tint);
  flex-wrap: wrap;
  gap: 12px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.35fr 0.65fr;
}

.hero-main-col {
  padding: 48px 44px;
  border-right: var(--border-dashed);
  position: relative;
}

.hero-Title-kicker {
  margin-bottom: 18px;
}

.hero-headline {
  font-size: clamp(2.25rem, 4.2vw, 3.6rem);
  margin-bottom: 20px;
  color: var(--ink);
}

.hero-headline .accent-cinnabar {
  color: var(--cinnabar);
}

.hero-subtitle {
  font-family: var(--font-serif);
  font-size: clamp(1.15rem, 2vw, 1.42rem);
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 18px;
}

.hero-intro {
  font-size: 1rem;
  color: var(--ink-muted);
  max-width: 640px;
  margin-bottom: 34px;
  line-height: 1.8;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}

.hero-stub-col {
  padding: 48px 34px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 28px;
  background-color: var(--bg-paper);
}

.stub-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  border-bottom: var(--border-ink);
  padding-bottom: 16px;
}

.stub-code {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
}

.stub-metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.stub-metric-item {
  border: var(--border-ink);
  padding: 14px;
  background-color: var(--bg-paper);
}

.stub-metric-label {
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
  display: block;
  margin-bottom: 4px;
}

.stub-metric-val {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--ink);
}

.stub-stamp-box {
  border: var(--border-dashed);
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.cinnabar-seal {
  border: 1.5px solid var(--cinnabar);
  color: var(--cinnabar);
  padding: 6px 12px;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: 0.85rem;
  transform: rotate(-6deg);
  letter-spacing: 0.06em;
  flex-shrink: 0;
}

/* Section Layout & Editorial Headers */
.section-block {
  padding: 88px 0;
  border-bottom: var(--border-ink);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  margin-bottom: 48px;
  padding-bottom: 22px;
  border-bottom: var(--border-ink);
  flex-wrap: wrap;
}

.section-title-wrap {
  max-width: 680px;
}

.section-index {
  font-family: var(--font-serif);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--cinnabar);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 8px;
}

.section-title {
  font-size: clamp(1.75rem, 3vw, 2.45rem);
  margin-bottom: 10px;
}

.section-desc {
  color: var(--ink-muted);
  font-size: 0.98rem;
}

/* 3 Core Advantage Graphic Cards */
.adv-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.editorial-card {
  border: var(--border-ink);
  background-color: var(--bg-paper);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
}

.card-illustration {
  border-bottom: var(--border-ink);
  background-color: var(--bg-paper-tint);
  padding: 14px;
}

.card-illustration img {
  width: 100%;
  height: auto;
}

.card-body {
  padding: 28px 26px;
  flex: 1;
}

.card-serial {
  font-family: var(--font-serif);
  font-size: 0.82rem;
  color: var(--cinnabar);
  font-weight: 700;
  letter-spacing: 0.06em;
  display: block;
  margin-bottom: 8px;
}

.card-title {
  font-size: 1.32rem;
  margin-bottom: 12px;
}

.card-text {
  font-size: 0.94rem;
  color: var(--ink-muted);
  line-height: 1.75;
}

.card-footer-stub {
  padding: 14px 26px;
  border-top: var(--border-dashed);
  font-size: 0.8rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--ink);
  background-color: var(--bg-paper);
}

/* Streaming & AI Support Graphic Cards */
.media-ai-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.ticket-feature-card {
  border: var(--border-ink);
  background-color: var(--bg-paper);
  position: relative;
  overflow: hidden;
}

.ticket-card-visual {
  padding: 18px;
  background-color: var(--bg-paper-tint);
  border-bottom: var(--border-ink);
}

.ticket-card-visual img {
  width: 100%;
  height: auto;
}

.ticket-card-content {
  padding: 32px 30px;
}

.tag-matrix {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.tag-chip {
  border: var(--border-ink);
  padding: 5px 12px;
  font-size: 0.82rem;
  font-weight: 500;
  background-color: var(--bg-paper);
}

.tag-chip-cinnabar {
  border-color: var(--cinnabar);
  color: var(--cinnabar);
}

/* Pricing Tickets & Comparison Table */
.pricing-cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  margin-bottom: 48px;
}

.fare-ticket {
  border: var(--border-ink);
  background-color: var(--bg-paper);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
}

.fare-ticket.featured {
  border-width: 2px;
}

.fare-top {
  padding: 26px 24px 22px;
}

.fare-class {
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-muted);
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.fare-name {
  font-size: 1.38rem;
  margin-bottom: 14px;
}

.fare-price-block {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 10px;
}

.fare-currency {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
}

.fare-amount {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1;
  color: var(--cinnabar);
}

.fare-period {
  font-size: 0.85rem;
  color: var(--ink-muted);
}

.fare-bottom {
  padding: 22px 24px 26px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  flex: 1;
  justify-content: space-between;
}

.fare-specs {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.9rem;
}

.fare-specs li {
  display: flex;
  justify-content: space-between;
  border-bottom: 1px dotted #1C1917;
  padding-bottom: 6px;
}

/* Comparison Table */
.table-scroll-wrap {
  width: 100%;
  overflow-x: auto;
  border: var(--border-ink);
  background-color: var(--bg-paper);
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
  text-align: left;
}

.pricing-table th,
.pricing-table td {
  padding: 16px 20px;
  border-bottom: var(--border-ink);
  border-right: var(--border-ink);
  font-size: 0.92rem;
}

.pricing-table th:last-child,
.pricing-table td:last-child {
  border-right: none;
}

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

.pricing-table thead th {
  background-color: var(--bg-paper-tint);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 0.96rem;
}

.pricing-table .serif-num {
  font-weight: 700;
  font-size: 1.02rem;
}

/* Passenger Reviews / Endorsements */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.review-passport {
  border: var(--border-ink);
  padding: 28px 26px;
  background-color: var(--bg-paper);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 20px;
}

.review-meta-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: var(--border-dashed);
  padding-bottom: 12px;
  font-size: 0.8rem;
}

.review-rating {
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--cinnabar);
}

.review-quote {
  font-size: 0.95rem;
  color: var(--ink);
  line-height: 1.78;
}

.review-author {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.84rem;
  color: var(--ink-muted);
  border-top: var(--border-ink);
  padding-top: 12px;
}

/* FAQ Accordion */
.faq-list {
  display: flex;
  flex-direction: column;
  border-top: var(--border-ink);
}

.faq-item {
  border-bottom: var(--border-ink);
  border-left: var(--border-ink);
  border-right: var(--border-ink);
  background-color: var(--bg-paper);
}

.faq-question {
  padding: 22px 26px;
  font-family: var(--font-serif);
  font-size: 1.14rem;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

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

.faq-question:hover {
  color: var(--cinnabar);
}

.faq-toggle-mark {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--cinnabar);
  flex-shrink: 0;
}

.faq-answer {
  padding: 0 26px 24px;
  color: var(--ink-muted);
  font-size: 0.95rem;
  line-height: 1.8;
  border-top: var(--border-dashed);
  padding-top: 18px;
}

/* Secondary Pages & Editorial Articles */
.subpage-main {
  padding: 64px 0 96px;
}

.subpage-header {
  border: var(--border-ink);
  padding: 40px 36px;
  background-color: var(--bg-paper-tint);
  margin-bottom: 44px;
}

.document-sheet {
  border: var(--border-ink);
  padding: 44px;
  background-color: var(--bg-paper);
  margin-bottom: 32px;
}

.document-sheet h2 {
  font-size: 1.55rem;
  margin: 28px 0 14px;
  padding-bottom: 8px;
  border-bottom: var(--border-dashed);
}

.document-sheet h2:first-child {
  margin-top: 0;
}

.document-sheet h3 {
  font-size: 1.18rem;
  margin: 20px 0 10px;
}

.document-sheet p,
.document-sheet li {
  color: var(--ink-muted);
  margin-bottom: 12px;
  line-height: 1.8;
}

.document-sheet ul {
  padding-left: 22px;
  margin-bottom: 18px;
}

/* Articles Grid on Dispatch Page */
.articles-stack {
  display: flex;
  flex-direction: column;
  gap: 36px;
}

.dispatch-article {
  border: var(--border-ink);
  background-color: var(--bg-paper);
  padding: 38px 40px;
  position: relative;
}

.dispatch-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 14px;
  margin-bottom: 18px;
  border-bottom: var(--border-dashed);
  font-size: 0.82rem;
  color: var(--ink-muted);
}

.dispatch-article h2 {
  font-size: 1.55rem;
  margin-bottom: 16px;
}

.dispatch-article h3 {
  font-size: 1.15rem;
  margin: 20px 0 10px;
}

.dispatch-article p {
  color: var(--ink-muted);
  margin-bottom: 14px;
  line-height: 1.82;
}

/* Footer — Strictly 4 Links Opening in New Tabs */
.site-footer {
  padding: 48px 0;
  background-color: var(--bg-paper-tint);
}

.footer-nav-only {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 42px;
  flex-wrap: wrap;
}

.footer-nav-link {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  padding: 6px 12px;
  border: 1px solid transparent;
}

.footer-nav-link:hover {
  color: var(--bg-paper);
  background-color: var(--cinnabar);
  border-color: var(--ink);
}

/* Responsive Media Queries (@media) */
@media (max-width: 980px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .hero-main-col {
    border-right: none;
    border-bottom: var(--border-dashed);
    padding: 36px 28px;
  }
  .hero-stub-col {
    padding: 32px 28px;
  }
  .adv-grid {
    grid-template-columns: 1fr;
  }
  .media-ai-grid {
    grid-template-columns: 1fr;
  }
  .pricing-cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  .container {
    padding: 0 16px;
  }
  .header-inner {
    flex-direction: column;
    align-items: stretch;
    padding: 16px 0;
    gap: 14px;
  }
  .main-nav {
    justify-content: space-between;
    gap: 10px;
  }
  .hero-section {
    padding: 36px 0 48px;
  }
  .hero-main-col,
  .hero-stub-col {
    padding: 24px 18px;
  }
  .hero-cta-group {
    flex-direction: column;
    align-items: stretch;
  }
  .hero-cta-group .btn {
    width: 100%;
    min-height: 50px;
    text-align: center;
  }
  .pricing-cards-grid {
    grid-template-columns: 1fr;
  }
  .section-block {
    padding: 56px 0;
  }
  .document-sheet,
  .dispatch-article,
  .subpage-header {
    padding: 24px 18px;
  }
  .footer-nav-only {
    flex-direction: column;
    gap: 14px;
  }
  .footer-nav-link {
    width: 100%;
    text-align: center;
    min-height: 46px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: var(--border-ink);
    background-color: var(--bg-paper);
  }
}