:root {
  color-scheme: light;
  --background: #f7f6f2;
  --surface: #ffffff;
  --surface-muted: #efeee9;
  --text: #242321;
  --muted: #6b6862;
  --line: #d8d5ce;
  --accent: #9a3f2e;
  --accent-soft: #f3e6e1;
  --radius-large: 16px;
  --radius-small: 8px;
  --content: 960px;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --background: #1c1b19;
    --surface: #252320;
    --surface-muted: #302e2a;
    --text: #efede8;
    --muted: #b5b0a8;
    --line: #494641;
    --accent: #dc7a64;
    --accent-soft: #4a302a;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: "Avenir Next", Avenir, "Noto Sans TC", "PingFang TC", system-ui, sans-serif;
  line-height: 1.65;
}
button, input { font: inherit; }
a { color: inherit; }
.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 10;
  padding: 0.6rem 0.85rem;
  border-radius: var(--radius-small);
  background: var(--text);
  color: var(--background);
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }
main {
  width: min(calc(100% - 2.5rem), var(--content));
  margin-inline: auto;
}
button:active, .trip-link:active { transform: translateY(1px); }
a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.kicker {
  margin: 0 0 0.75rem;
  color: var(--accent);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
h1, h2, h3, h4, p { margin-top: 0; }
.trip-index { padding: 2rem 0 5rem; }
.trip-list { display: grid; gap: 0.75rem; }
.trip-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1.5rem;
  align-items: center;
  padding: 1.4rem 1.5rem;
  border-radius: var(--radius-large);
  background: var(--surface);
}
.trip-card h3 { margin-bottom: 0.2rem; font-size: 1.45rem; letter-spacing: -0.025em; }
.trip-card p { margin-bottom: 0; color: var(--muted); font-size: 0.9rem; }
.trip-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1rem;
  margin-top: 0.8rem;
  color: var(--muted);
  font-size: 0.82rem;
}
.trip-link, .button, .copy-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0.65rem 1rem;
  border: 0;
  border-radius: var(--radius-small);
  background: var(--text);
  color: var(--background);
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
}
.trip-link:hover, .button:hover, .copy-button:hover { opacity: 0.86; }
.loading-state, .message-state {
  padding: 1.5rem;
  border-radius: var(--radius-large);
  background: var(--surface);
}
.loading-state span {
  display: block;
  width: 55%;
  height: 0.9rem;
  margin: 0.5rem 0;
  border-radius: 4px;
  background: var(--surface-muted);
}
.loading-state span:last-child { width: 32%; }
.message-state { padding: 2rem; }
.message-state p { color: var(--muted); }
.trip-detail { padding: 0 0 6rem; }
.detail-header { padding: 3rem 0 2rem; border-top: 1px solid var(--line); }
.detail-header-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 2rem;
}
.detail-header h2 {
  margin-bottom: 0.5rem;
  font-size: clamp(2.2rem, 6vw, 3.8rem);
  line-height: 1.1;
  letter-spacing: -0.05em;
}
.detail-header p { max-width: 38rem; color: var(--muted); }
.updated-at { color: var(--muted); font-size: 0.78rem; white-space: nowrap; }
.status-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  overflow: hidden;
  margin: 1.5rem 0 3.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-large);
  background: var(--line);
}
.status-item { padding: 1rem; background: var(--surface); }
.status-item span, .fact dt { display: block; color: var(--muted); font-size: 0.75rem; }
.status-item strong { display: block; margin-top: 0.2rem; font-size: 0.92rem; }
.detail-section { margin-top: 3.5rem; }
.detail-section > h3 { margin-bottom: 1.25rem; font-size: 1.35rem; }
.priority-list { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }
.priority-item { padding: 1.25rem; border-radius: var(--radius-large); background: var(--surface); }
.priority-item h4 { margin-bottom: 0.35rem; }
.priority-item p { margin-bottom: 0.8rem; color: var(--muted); font-size: 0.88rem; }
.label {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  border-radius: 5px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 700;
}
.day-list { border-top: 1px solid var(--line); }
.day { border-bottom: 1px solid var(--line); }
.day summary {
  display: grid;
  grid-template-columns: 7.5rem 1fr auto;
  gap: 1rem;
  align-items: center;
  padding: 1.15rem 0;
  cursor: pointer;
  list-style: none;
}
.day summary::-webkit-details-marker { display: none; }
.day summary::after { content: "+"; color: var(--muted); font-size: 1.25rem; }
.day[open] summary::after { content: "−"; }
.day-date {
  color: var(--accent);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.78rem;
  font-weight: 700;
}
.day-title { font-weight: 700; }
.day-content { padding: 0 0 1.5rem 8.5rem; }
.day-note { max-width: 42rem; color: var(--muted); font-size: 0.9rem; }
.timeline { display: grid; gap: 0.75rem; margin-top: 1.25rem; }
.timeline-row { display: grid; grid-template-columns: 7.5rem 1fr; gap: 1rem; }
.timeline-row time {
  color: var(--muted);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.78rem;
}
.timeline-row strong, .timeline-row small { display: block; }
.timeline-row small { color: var(--muted); }
.split-section { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.fact-list { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 0; }
.fact dd { margin: 0.15rem 0 0; font-weight: 600; }
.request-box { padding: 1.4rem; border-radius: var(--radius-large); background: var(--surface); }
.request-box blockquote { margin: 0 0 1rem; color: var(--muted); font-size: 0.9rem; }
.copy-button { min-height: 38px; padding: 0.5rem 0.75rem; font-size: 0.82rem; }
.prep-groups { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.prep-groups h4 { margin-bottom: 0.65rem; font-size: 0.95rem; }
.prep-groups ul { margin: 0; padding-left: 1.1rem; color: var(--muted); font-size: 0.88rem; }
.toast {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 5;
  max-width: min(20rem, calc(100vw - 2.5rem));
  padding: 0.7rem 0.9rem;
  border-radius: var(--radius-small);
  background: var(--text);
  color: var(--background);
  opacity: 0;
  pointer-events: none;
  transform: translateY(0.5rem);
  transition: opacity 180ms ease, transform 180ms ease;
}
.toast.visible { opacity: 1; transform: translateY(0); }

@media (max-width: 720px) {
  main { width: min(calc(100% - 2rem), var(--content)); }
  .trip-card { grid-template-columns: 1fr; }
  .trip-link { width: 100%; }
  .detail-header-top, .split-section { display: block; }
  .updated-at { display: block; margin-top: 1rem; }
  .status-grid, .priority-list, .prep-groups { grid-template-columns: 1fr 1fr; }
  .day summary { grid-template-columns: 1fr auto; gap: 0.25rem 1rem; }
  .day-date, .day-title { grid-column: 1; }
  .day summary::after { grid-column: 2; grid-row: 1 / span 2; }
  .day-content { padding-left: 0; }
  .timeline-row { grid-template-columns: 6.5rem 1fr; }
  .request-box { margin-top: 2rem; }
}

@media (max-width: 480px) {
  .status-grid, .priority-list, .prep-groups, .fact-list { grid-template-columns: 1fr; }
  .timeline-row { grid-template-columns: 1fr; gap: 0.1rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}

@media print {
  :root { color-scheme: light; }
  .trip-index, .copy-button, .toast { display: none !important; }
  body { background: white; color: #222; }
  .trip-detail { padding: 0; }
  .day-content { display: block !important; }
}