:root {
  color-scheme: light;
  font-family: "Noto Sans TC", "PingFang TC", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  --bg: #eef2f7;
  --nav: #0c1c2f;
  --card: #ffffff;
  --ink: #0a1733;
  --muted: #5a6b80;
  --accent: #1e7cf2;
  --accent-soft: #e6f0ff;
  --border: #d8e0ec;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  font-family: "Noto Sans TC", "PingFang TC", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

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

a:hover {
  text-decoration: underline;
}

.site-nav {
  background: var(--nav);
  color: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
}

.brand {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
}

.nav-links a {
  color: rgba(255, 255, 255, 0.9);
  font-weight: 600;
}

.nav-links a[aria-current="page"] {
  color: white;
}

.hero {
  background: linear-gradient(135deg, #0d2340, #123d73 60%, #1e7cf2);
  color: white;
  padding: 3.2rem 2rem 3rem;
}

.hero-compact {
  padding: 3rem 2rem;
}

.detail-hero {
  background: linear-gradient(135deg, #0d2340, #123d73 70%, #25a5ff);
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.45em;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 1rem;
}

.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(1.4rem, 3.5vw, 2.2rem);
}

.search-panel {
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1.2rem;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 24px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}

.filter-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.8rem;
}

.filter-field {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.filter-field label {
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.75);
}

.search-panel input,
.search-panel select {
  width: 100%;
  border-radius: 16px;
  border: none;
  padding: 0.85rem 1rem;
  font-size: 1rem;
}

.search-panel input {
  background: rgba(255, 255, 255, 0.95);
}

.search-panel select {
  background: rgba(255, 255, 255, 0.95);
  appearance: none;
  background-image: url("data:image/svg+xml,%3csvg width='14' height='8' viewBox='0 0 14 8' xmlns='http://www.w3.org/2000/svg'%3e%3cpath d='M1 1l6 5 6-5' stroke='%231e7cf2' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: calc(100% - 1rem) center;
  padding-right: 2.5rem;
}

.search-panel select:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

main {
  max-width: 1200px;
  margin: -3rem auto 4rem;
  padding: 0 1.5rem;
}

.detail-page main {
  max-width: 1200px;
  margin-top: -3rem;
}

.airline-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.2rem;
}

.airline-card {
  background: var(--card);
  border-radius: 24px;
  border: 1px solid var(--border);
  padding: 1.8rem;
  box-shadow: 0 25px 40px rgba(10, 23, 51, 0.08);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.airline-article {
  scroll-margin-top: 6rem;
}

.airline-card header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.8rem;
}

.airline-code {
  font-size: 0.85rem;
  letter-spacing: 0.3em;
  color: var(--muted);
  margin: 0 0 0.2rem;
}

.airline-card h2 {
  margin: 0;
  font-size: 1.4rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.9rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
}

.airline-summary {
  margin: 0;
  color: var(--muted);
}

.airline-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.airline-list li {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px dashed var(--border);
}

.airline-list li:last-child {
  border-bottom: none;
}

.airline-list strong {
  font-size: 0.95rem;
}

.airline-list span {
  color: var(--muted);
  font-size: 0.85rem;
}

.airline-link {
  margin-top: auto;
  font-weight: 600;
}

.fleet-section {
  margin-top: 3rem;
}

.fleet-header {
  text-align: center;
  margin-bottom: 2rem;
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}

.fleet-header .eyebrow {
  color: var(--nav);
  display: inline-block;
  margin-top: 1.5rem;
}

.fleet-header h2 {
  margin-top: 0.2rem;
}

.fleet-spacer {
  height: 0.75rem;
}

.detail-layout {
  display: grid;
  grid-template-columns: minmax(240px, 260px) 1fr;
  gap: 1.5rem;
  margin-top: 2rem;
}

.detail-sidebar {
  position: sticky;
  top: 2rem;
  align-self: start;
  background: var(--card);
  border-radius: 22px;
  padding: 1.8rem;
  border: 1px solid var(--border);
  box-shadow: 0 18px 35px rgba(10, 23, 51, 0.08);
}

.detail-sidebar h2 {
  margin: 0 0 1rem;
  font-size: 1.1rem;
}

.detail-sidebar ul {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.detail-sidebar a {
  color: var(--ink);
  font-weight: 600;
}

.detail-sidebar a:hover {
  color: var(--accent);
}

.sidebar-note {
  font-size: 0.85rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  padding-top: 0.8rem;
}

.detail-content {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.aircraft-card {
  background: var(--card);
  border-radius: 28px;
  padding: 2rem;
  border: 1px solid var(--border);
  box-shadow: 0 25px 55px rgba(10, 23, 51, 0.08);
  backdrop-filter: blur(8px);
}

.aircraft-card header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: flex-start;
  border-bottom: 1px solid var(--border);
  padding-bottom: 1rem;
  margin-bottom: 1rem;
}

.aircraft-code {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.4em;
  font-size: 0.8rem;
  color: var(--muted);
}

.aircraft-card h2 {
  margin: 0.2rem 0;
  font-size: 1.8rem;
}

.family {
  margin: 0;
  color: var(--muted);
}

.aircraft-summary {
  margin: 0 0 1.3rem;
  color: var(--muted);
}

.spec-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
}

.spec-block {
  border-radius: 16px;
  border: 1px dashed var(--border);
  padding: 1rem;
}

.spec-block strong {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  letter-spacing: 0.1em;
}

.spec-block span {
  font-size: 1.2rem;
}

.seat-callout {
  margin-top: 1.2rem;
  background: var(--accent-soft);
  border-radius: 12px;
  padding: 0.9rem 1rem;
  border: 1px solid var(--accent);
  color: var(--ink);
}

.airline-article .aircraft-summary {
  margin-bottom: 1.5rem;
}

.model-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.model-card {
  border-radius: 18px;
  border: 1px solid var(--border);
  padding: 1.2rem;
  background: #f9fbff;
  box-shadow: inset 0 0 0 1px rgba(30, 124, 242, 0.05);
}

.model-card-link {
  display: block;
  color: inherit;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.model-card-link:hover {
  transform: translateY(-2px);
  box-shadow:
    inset 0 0 0 1px rgba(30, 124, 242, 0.05),
    0 18px 30px rgba(30, 124, 242, 0.15);
}

.model-card h3 {
  margin: 0;
}

.model-role {
  margin: 0.2rem 0 0.8rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.model-specs {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.9rem;
}

.model-specs strong {
  font-weight: 600;
}

@media (max-width: 900px) {
  .detail-layout {
    grid-template-columns: 1fr;
  }

  .detail-sidebar {
    position: static;
  }
}

@media (max-width: 640px) {
  .site-nav {
    flex-direction: column;
    gap: 0.8rem;
  }

  .hero {
    padding: 3rem 1.5rem;
  }

  .search-panel {
    padding: 1rem;
  }

  .filter-row {
    grid-template-columns: 1fr;
  }

  main {
    margin-top: -2rem;
  }

  .airline-card header,
  .aircraft-card header {
    flex-direction: column;
    align-items: flex-start;
  }
}

.aircraft-detail-layout {
  display: grid;
  grid-template-columns: minmax(240px, 260px) 1fr;
  gap: 1.2rem;
  margin: 2rem auto 4rem;
  align-items: start;
}

.aircraft-overview {
  background: radial-gradient(circle at top right, rgba(37, 165, 255, 0.25), transparent 55%), var(--card);
  border: 1px solid rgba(255, 255, 255, 0.5);
  box-shadow: 0 35px 65px rgba(10, 23, 51, 0.12);
}

.overview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.2rem;
}

.badge {
  padding: 0.35rem 1rem;
  border-radius: 999px;
  background: linear-gradient(120deg, #25a5ff, #1e7cf2);
  color: white;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.aircraft-side-panel {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  padding: 1.2rem 0 0;
}

.aircraft-side-panel.detail-sidebar {
  padding: 1.2rem;
  gap: 0.3rem;
}

.sidebar-block {
  padding-bottom: 0.3rem;
}

.sidebar-block:last-of-type {
  padding-bottom: 0;
}

.section-title {
  margin-bottom: 0.6rem;
}

.eyebrow-muted {
  color: var(--muted);
  letter-spacing: 0.4em;
}

.aircraft-meta {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.25em;
  font-size: 0.75rem;
  color: var(--muted);
}

.variant-section {
  margin-top: 2rem;
}

.variant-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.variant-card {
  border-radius: 20px;
  border: 1px solid var(--border);
  padding: 1.2rem 1.3rem;
  background: #f4f7ff;
  box-shadow:
    inset 0 0 0 1px rgba(30, 124, 242, 0.08),
    0 15px 30px rgba(10, 23, 51, 0.08);
}

.variant-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  margin-bottom: 0.6rem;
}

.variant-card-header h3 {
  margin: 0;
  font-size: 1.15rem;
}

.variant-badge {
  padding: 0.2rem 0.8rem;
  border-radius: 999px;
  background: rgba(30, 124, 242, 0.15);
  color: var(--ink);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.variant-summary {
  margin: 0 0 0.8rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.variant-specs {
  list-style: none;
  margin: 0 0 0.8rem;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.variant-specs strong {
  display: block;
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.variant-specs span {
  font-size: 1rem;
}

.variant-comfort {
  margin: 0;
  font-size: 0.9rem;
  color: var(--ink);
  background: white;
  border-radius: 12px;
  padding: 0.7rem 0.9rem;
  border: 1px solid rgba(30, 124, 242, 0.15);
}

.spotlight-list,
.airline-chip-list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
}

.spotlight-list li {
  padding-left: 1rem;
  position: relative;
  margin-bottom: 0.4rem;
  color: var(--muted);
  line-height: 1.4;
}

.spotlight-list li::before {
  content: "✦";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.75rem;
  top: 0.1rem;
}

.airline-chip-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.airline-chip {
  display: inline-flex;
  align-items: center;
  justify-content: flex-start;
  width: 100%;
  padding: 0.2rem 0;
  color: var(--muted);
  font-size: 0.9rem;
  text-decoration: none;
}

.airline-chip:hover,
.airline-chip:focus-visible {
  color: var(--accent);
}

.detail-sidebar a.airline-chip,
.detail-sidebar span.airline-chip {
  color: #7a889e;
  font-weight: 500;
}

.empty-state {
  text-align: center;
}

.empty-state a {
  display: inline-block;
  margin-top: 0.8rem;
  font-weight: 600;
}

@media (max-width: 960px) {
  .aircraft-detail-layout {
    grid-template-columns: 1fr;
  }

  .aircraft-side-panel.detail-sidebar {
    padding: 1.5rem;
  }
}

@media (max-width: 640px) {
  .overview-header {
    flex-direction: column;
    align-items: flex-start;
  }
}