:root {
  --paper: #f3efe6;
  --ink: #161b20;
  --ink-soft: #5c656e;
  --card: #fffdf8;
  --card-2: #ebe6da;
  --line: #d4cdc0;
  --line-strong: #161b20;
  --accent: #0f6e6b;
  --accent-ink: #f3efe6;
  --warn: #8a4b12;
  --warn-bg: #f0e0c8;
  --led: #0f6e6b;
  --max: 44rem;
  --font-display: "Shippori Mincho", "Songti SC", "Noto Serif SC", serif;
  --font-sans: "Zen Kaku Gothic New", "PingFang SC", "Hiragino Sans GB", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", ui-monospace, monospace;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #10161c;
    --ink: #e8e2d6;
    --ink-soft: #9aa3ab;
    --card: #171e25;
    --card-2: #12181e;
    --line: #2a343d;
    --line-strong: #d7cbb8;
    --accent: #d9a15a;
    --accent-ink: #10161c;
    --warn: #e0b36a;
    --warn-bg: #2a2216;
    --led: #d9a15a;
    color-scheme: dark;
  }
}

:root[data-theme="light"] {
  --paper: #f3efe6;
  --ink: #161b20;
  --ink-soft: #5c656e;
  --card: #fffdf8;
  --card-2: #ebe6da;
  --line: #d4cdc0;
  --line-strong: #161b20;
  --accent: #0f6e6b;
  --accent-ink: #f3efe6;
  --warn: #8a4b12;
  --warn-bg: #f0e0c8;
  --led: #0f6e6b;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --paper: #10161c;
  --ink: #e8e2d6;
  --ink-soft: #9aa3ab;
  --card: #171e25;
  --card-2: #12181e;
  --line: #2a343d;
  --line-strong: #d7cbb8;
  --accent: #d9a15a;
  --accent-ink: #10161c;
  --warn: #e0b36a;
  --warn-bg: #2a2216;
  --led: #d9a15a;
  color-scheme: dark;
}

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

html, body { margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  -webkit-tap-highlight-color: transparent;
}

.grain,
.scale {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 0;
}

.grain {
  opacity: 0.045;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.scale {
  background-image:
    repeating-linear-gradient(
      90deg,
      transparent 0 47px,
      color-mix(in srgb, var(--ink) 7%, transparent) 47px 48px
    );
  mask-image: linear-gradient(180deg, var(--paper), transparent 28%, transparent 78%, var(--paper));
}

.wrap {
  position: relative;
  z-index: 1;
  width: min(100%, var(--max));
  margin-inline: auto;
  padding:
    calc(18px + env(safe-area-inset-top))
    max(18px, env(safe-area-inset-right))
    calc(36px + env(safe-area-inset-bottom))
    max(18px, env(safe-area-inset-left));
}

.topbar {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 8px;
}

.icon-btn {
  appearance: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: var(--card);
  color: var(--ink);
  display: grid;
  place-items: center;
  cursor: pointer;
}

.icon-btn svg { width: 18px; height: 18px; }
.icon-btn:active { transform: translateY(1px); }

.sun { display: none; }
.moon { display: block; }

@media (prefers-color-scheme: dark) {
  .sun { display: block; }
  .moon { display: none; }
}

:root[data-theme="light"] .sun { display: none; }
:root[data-theme="light"] .moon { display: block; }
:root[data-theme="dark"] .sun { display: block; }
:root[data-theme="dark"] .moon { display: none; }

.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  margin: 8px 0 32px;
  text-align: center;
}

.ticket-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  padding: 5px 12px 5px 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--card);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-soft);
}

.dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--led);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--led) 18%, transparent);
}

.hero h1 {
  margin: 0 0 12px;
  width: 100%;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.4rem, 9vw, 4rem);
  line-height: 1.15;
  text-wrap: balance;
  text-align: center;
}

.lede {
  margin: 0 auto;
  max-width: 22em;
  color: var(--ink-soft);
  text-wrap: pretty;
  text-align: center;
}

.list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

details.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 3px solid var(--line);
  overflow: clip;
}

details.card[open] {
  border-left-color: var(--led);
}

summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 14px;
  min-height: 74px;
  padding: 14px 16px;
  user-select: none;
  -webkit-user-select: none;
}

summary::-webkit-details-marker { display: none; }

.gate {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line);
}

details[open] .gate {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.q {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.q small {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-soft);
}

.q strong {
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 600;
  line-height: 1.35;
  text-wrap: balance;
}

.chev {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  color: var(--ink-soft);
  transition: transform 180ms ease-out;
}

.chev svg { width: 16px; height: 16px; }

details[open] .chev {
  transform: rotate(180deg);
  color: var(--accent);
}

.panel {
  padding: 4px 16px 20px 18px;
  border-top: 1px solid var(--line);
}

.panel > :first-child { margin-top: 16px; }

h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.35;
  text-wrap: balance;
  margin: 22px 0 8px;
}

h2 { font-size: 1.35rem; }
h3 { font-size: 1.15rem; }

p {
  margin: 0 0 12px;
  text-wrap: pretty;
}

.note,
.callout,
.tip,
.stamp-box,
.mode {
  border: 1px solid var(--line);
  background: var(--card-2);
  padding: 12px 14px;
  margin: 12px 0;
}

.note { background: var(--warn-bg); border-color: color-mix(in srgb, var(--warn) 45%, var(--line)); }

.note strong,
.callout strong,
.tip strong {
  display: block;
  font-size: 13px;
  margin-bottom: 4px;
}

.pair {
  display: grid;
  gap: 10px;
  margin: 12px 0;
}

@media (min-width: 640px) {
  .pair { grid-template-columns: 1fr 1fr; }
}

.mode { margin: 0; min-height: 100%; }

.mode .tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.04em;
  padding: 2px 7px;
  border: 1px solid var(--line-strong);
  margin-bottom: 8px;
}

.mode.direct .tag {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
}

.mode h3 { margin: 0 0 8px; }

.kv {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
}

.kv li {
  display: grid;
  grid-template-columns: 3.2em 1fr;
  gap: 8px;
  font-size: 14px;
  margin: 0 0 6px;
}

.kv b {
  font-size: 12px;
  color: var(--accent);
  padding-top: 2px;
}

.split {
  display: grid;
  gap: 10px;
  margin: 12px 0;
}

.stamp-box { margin: 0; }

.stamp-box em {
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 11px;
  color: var(--ink-soft);
}

.rec {
  margin-top: 16px;
  padding: 14px;
  background: var(--ink);
  color: var(--paper);
}

.rec p { color: inherit; margin: 0; }
.rec b { color: #d9a15a; }

.airports {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 8px;
}

.airport {
  display: grid;
  gap: 6px;
  padding: 14px;
  border: 1px solid var(--line);
  background: var(--card-2);
  text-decoration: none;
  color: inherit;
}

.airport-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
}

.airport-top small {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-soft);
}

.price {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.airport h3 { margin: 0; font-size: 1.3rem; }
.airport p { margin: 0; color: var(--ink-soft); font-size: 14px; }

.cta {
  margin-top: 4px;
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
}

.steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
  margin: 12px 0 16px;
}

.steps li {
  counter-increment: step;
  position: relative;
  padding: 0 0 16px 46px;
}

.steps li:last-child { padding-bottom: 0; }

.steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
}

.prompt {
  margin: 12px 0 16px;
  border: 1px solid var(--line);
  background: #0d1217;
  color: #e4dccb;
  overflow: hidden;
}

.prompt-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 12px;
  border-bottom: 1px solid #26303a;
  font-family: var(--font-mono);
  font-size: 11px;
  color: #9aa3ab;
}

.copy {
  appearance: none;
  border: 1px solid #9aa3ab;
  background: transparent;
  color: #e4dccb;
  border-radius: 2px;
  padding: 6px 10px;
  font: inherit;
  min-height: 32px;
  cursor: pointer;
}

.copy.copied {
  background: #e4dccb;
  color: #0d1217;
}

.prompt pre {
  margin: 0;
  padding: 14px;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
}

.panel a,
.callout a,
.note a {
  color: var(--accent);
  text-underline-offset: 3px;
  white-space: nowrap;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.foot {
  display: flex;
  justify-content: center;
  width: 100%;
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  text-align: center;
}

.air-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px 16px;
  width: 100%;
}

.air-nav a {
  color: var(--ink);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  border-bottom: 1px solid color-mix(in srgb, var(--ink) 28%, transparent);
}

.air-nav a:hover,
.air-nav a:active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(18px + env(safe-area-inset-bottom));
  transform: translateX(-50%) translateY(12px);
  background: var(--ink);
  color: var(--paper);
  padding: 10px 16px;
  font-size: 14px;
  opacity: 0;
  pointer-events: none;
  z-index: 20;
  transition: opacity 180ms ease-out, transform 180ms ease-out;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .chev, .toast, .icon-btn { transition: none; }
}