/* ==========================================================================
   XSUS AIRPORT (XSUS机场) — DARK TERMINAL INTERFACE STYLESHEET
   Colors:
     Background:      #0A0F0D
     Elevated Panel:  #121A15
     Border / Line:   #223028
     Primary Accent:  #3EF2A0 (Interactive, Live Status, Logo ONLY)
     Accent Hover:    #6BF7B8
     Primary Text:    #E9F5EE
     Secondary Text:  #8FA89B
   Rules: 12px radius, flat surfaces, thin borders, zero gradients, zero glow.
   ========================================================================== */

:root {
  --bg-base: #0A0F0D;
  --bg-panel: #121A15;
  --bg-panel-alt: #0E1511;
  --border-thin: #223028;
  --accent-mint: #3EF2A0;
  --accent-bright: #72F9BE;
  --text-main: #E9F5EE;
  --text-muted: #8FA89B;
  --radius-card: 12px;
  --font-heading: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --font-body: -apple-system, BlinkMacSystemFont, 'Space Grotesk', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

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

html {
  scroll-behavior: smooth;
  background-color: var(--bg-base);
  color: var(--text-main);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--bg-base);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Typography Rules */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  color: var(--text-main);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.mono-label,
.status-pill,
.telemetry-tag,
.table-label {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

.mono-readout {
  font-family: var(--font-mono);
  font-weight: 400;
}

a {
  color: var(--accent-mint);
  text-decoration: none;
  position: relative;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

a:hover {
  color: var(--accent-bright);
}

/* Underline Sweep Effect for Links & Interactive Elements */
.sweep-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding-bottom: 3px;
}

.sweep-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0%;
  height: 1.5px;
  background-color: var(--accent-bright);
  transition: width 0.24s cubic-bezier(0.22, 1, 0.36, 1);
}

.sweep-link:hover::after {
  width: 100%;
}

/* Layout Containers */
.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 76px 0;
  border-bottom: 1px solid var(--border-thin);
}

.section-header {
  margin-bottom: 44px;
}

.section-header .mono-label {
  color: var(--accent-mint);
  display: inline-block;
  margin-bottom: 12px;
}

.section-header h2 {
  font-size: 2rem;
  margin-bottom: 12px;
}

.section-header p {
  color: var(--text-muted);
  max-width: 680px;
  font-size: 1rem;
}

/* Status Pill (Monospace Capsule) */
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background-color: var(--bg-panel);
  border: 1px solid var(--border-thin);
  border-radius: var(--radius-card);
  color: var(--text-main);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-mint);
  display: inline-block;
  flex-shrink: 0;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-base);
  border-bottom: 1px solid var(--border-thin);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 20px;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--text-main);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.2rem;
}

.brand-logo img,
.brand-logo svg {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  display: block;
}

.brand-logo-meta {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-logo-sub {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--accent-mint);
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

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

.nav-link {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-main);
  padding: 6px 0;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0%;
  height: 2px;
  background-color: var(--accent-bright);
  transition: width 0.22s ease;
}

.nav-link:hover {
  color: var(--accent-bright);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-link.nav-highlight {
  color: var(--accent-mint);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  padding: 13px 22px;
  min-height: 46px;
  border-radius: var(--radius-card);
  border: 1px solid var(--border-thin);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0%;
  height: 2px;
  background-color: var(--bg-base);
  transition: width 0.25s ease;
}

.btn-primary {
  background-color: var(--accent-mint);
  color: var(--bg-base);
  border-color: var(--accent-mint);
}

.btn-primary:hover {
  background-color: var(--accent-bright);
  border-color: var(--accent-bright);
  color: var(--bg-base);
}

.btn-primary:hover::after {
  width: 100%;
}

.btn-outline {
  background-color: var(--bg-panel);
  color: var(--accent-mint);
  border-color: var(--accent-mint);
}

.btn-outline::after {
  background-color: var(--accent-bright);
}

.btn-outline:hover {
  color: var(--accent-bright);
  border-color: var(--accent-bright);
  background-color: var(--bg-panel-alt);
}

.btn-outline:hover::after {
  width: 100%;
}

.btn-sm {
  padding: 9px 16px;
  min-height: 38px;
  font-size: 0.75rem;
}

/* Hero Section */
.hero-section {
  padding: 84px 0 76px;
  border-bottom: 1px solid var(--border-thin);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.95fr;
  gap: 36px;
  align-items: stretch;
}

.hero-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.hero-status-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 24px;
}

.hero-title {
  font-size: 3.1rem;
  font-weight: 700;
  margin-bottom: 18px;
  line-height: 1.18;
}

.hero-title .brand-accent {
  color: var(--accent-mint);
}

.hero-subtitle {
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 1.28rem;
  color: var(--text-main);
  margin-bottom: 16px;
}

.hero-desc {
  color: var(--text-muted);
  font-size: 1rem;
  margin-bottom: 30px;
  max-width: 640px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 32px;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  padding-top: 24px;
  border-top: 1px solid var(--border-thin);
}

.metric-item {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-thin);
  border-radius: var(--radius-card);
  padding: 14px 16px;
}

.metric-value {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.35rem;
  color: var(--accent-mint);
  display: block;
}

.metric-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

/* Terminal Telemetry Panel in Hero */
.terminal-card {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-thin);
  border-radius: var(--radius-card);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
}

.terminal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-thin);
  background-color: var(--bg-base);
}

.terminal-dots {
  display: flex;
  gap: 8px;
}

.terminal-dots span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 1px solid var(--border-thin);
  background-color: var(--bg-panel);
}

.terminal-dots span:first-child {
  background-color: var(--accent-mint);
  border-color: var(--accent-mint);
}

.terminal-body {
  padding: 20px 18px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.node-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  background-color: var(--bg-base);
  border: 1px solid var(--border-thin);
  border-radius: 8px;
}

.node-name {
  color: var(--text-main);
  font-weight: 600;
}

.node-meta {
  color: var(--text-muted);
  font-size: 0.75rem;
}

.node-ping {
  color: var(--accent-mint);
  font-weight: 600;
}

.terminal-footer {
  padding: 12px 18px;
  border-top: 1px solid var(--border-thin);
  background-color: var(--bg-base);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

/* 3 Core Advantage Cards */
.cards-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-thin);
  border-radius: var(--radius-card);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: border-color 0.2s ease;
}

.feature-card:hover {
  border-color: var(--accent-mint);
}

.feature-card-img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  border: 1px solid var(--border-thin);
  background-color: var(--bg-base);
  display: block;
}

.feature-card h3 {
  font-size: 1.25rem;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.94rem;
  flex-grow: 1;
}

.feature-card-footer {
  padding-top: 14px;
  border-top: 1px solid var(--border-thin);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Streaming & AI Support Section */
.cards-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.support-card {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-thin);
  border-radius: var(--radius-card);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.support-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.badge-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tech-badge {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  padding: 6px 12px;
  border-radius: var(--radius-card);
  background-color: var(--bg-base);
  border: 1px solid var(--border-thin);
  color: var(--text-main);
}

.tech-badge.unlocked {
  border-color: var(--accent-mint);
  color: var(--accent-mint);
}

/* Pricing Comparison Section */
.pricing-table-wrapper {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-thin);
  border-radius: var(--radius-card);
  overflow-x: auto;
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 760px;
}

.pricing-table th,
.pricing-table td {
  padding: 18px 20px;
  border-bottom: 1px solid var(--border-thin);
}

.pricing-table th {
  background-color: var(--bg-base);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-muted);
}

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

.pricing-table tbody tr:hover {
  background-color: var(--bg-panel-alt);
}

.plan-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.08rem;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

.plan-price {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--accent-mint);
}

.plan-cycle {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Testimonials / User Reviews */
.review-card {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-thin);
  border-radius: var(--radius-card);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 18px;
}

.review-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-thin);
}

.review-rating {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-mint);
  letter-spacing: 0.14em;
}

.review-quote {
  color: var(--text-main);
  font-size: 0.95rem;
}

.review-author {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

/* FAQ Section */
.faq-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.faq-item {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-thin);
  border-radius: var(--radius-card);
  padding: 22px 24px;
}

.faq-item h3 {
  font-size: 1.08rem;
  margin-bottom: 10px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.faq-q-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-mint);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  margin-top: 3px;
  flex-shrink: 0;
}

.faq-item p {
  color: var(--text-muted);
  font-size: 0.93rem;
}

/* CTA Banner */
.cta-banner {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-thin);
  border-radius: var(--radius-card);
  padding: 44px 36px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

/* Footer — Strict 4 Titles Only */
.site-footer {
  margin-top: auto;
  background-color: var(--bg-base);
  border-top: 1px solid var(--border-thin);
  padding: 36px 0;
}

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

.footer-title-link {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-main);
  padding: 8px 4px;
  position: relative;
}

.footer-title-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0%;
  height: 2px;
  background-color: var(--accent-bright);
  transition: width 0.22s ease;
}

.footer-title-link:hover {
  color: var(--accent-bright);
}

.footer-title-link:hover::after {
  width: 100%;
}

/* Secondary Pages & SEO Articles Styling */
.page-shell {
  padding: 60px 0 80px;
}

.doc-panel {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-thin);
  border-radius: var(--radius-card);
  padding: 36px;
  margin-bottom: 28px;
}

.doc-panel h2 {
  font-size: 1.5rem;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-thin);
}

.doc-panel h3 {
  font-size: 1.15rem;
  margin: 22px 0 10px;
  color: var(--text-main);
}

.doc-panel p,
.doc-panel li {
  color: var(--text-muted);
  margin-bottom: 12px;
  font-size: 0.96rem;
}

.doc-panel ul,
.doc-panel ol {
  padding-left: 20px;
  margin-bottom: 16px;
}

.article-toc-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 44px;
}

.toc-card {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-thin);
  border-radius: var(--radius-card);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toc-card:hover {
  border-color: var(--accent-mint);
}

/* Responsive Media Queries (@media) */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .cards-grid-3 {
    grid-template-columns: 1fr;
  }

  .cards-grid-2 {
    grid-template-columns: 1fr;
  }

  .faq-list {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 768px) {
  .section {
    padding: 52px 0;
  }

  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    padding: 14px 0;
    gap: 14px;
  }

  .main-nav {
    width: 100%;
    gap: 14px;
    justify-content: flex-start;
  }

  .hero-section {
    padding: 48px 0 52px;
  }

  .hero-title {
    font-size: 2.15rem;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }

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

  .hero-actions .btn {
    width: 100%;
    min-height: 50px;
  }

  .hero-metrics {
    grid-template-columns: 1fr;
  }

  .cta-banner {
    padding: 28px 22px;
    flex-direction: column;
    align-items: stretch;
  }

  .cta-banner .btn {
    width: 100%;
    min-height: 50px;
  }

  .doc-panel {
    padding: 24px 18px;
  }

  .footer-nav-only {
    flex-direction: column;
    gap: 18px;
  }
}