:root {
  --fg: #1d1d1f;
  --muted: #6b6b70;
  --bg: #fafaf7;
  --panel: #ffffff;
  --border: #e4e2dc;
  --accent: #8b4a3a;
  --accent-bg: #f5ece8;
  --code-bg: #f1efe9;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.55;
  color: var(--fg);
  background: var(--bg);
}

header, main, footer {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

header {
  padding-top: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
}

header h1 {
  margin: 0 0 0.35rem 0;
  font-size: 1.9rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.subtitle {
  margin: 0 0 0.5rem 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.travelers {
  margin: 0 0 1rem 0;
  font-size: 0.95rem;
}

.controls {
  display: flex;
  gap: 0.5rem;
}

.controls button {
  font: inherit;
  font-size: 0.85rem;
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--fg);
  border-radius: 6px;
  cursor: pointer;
}

.controls button:hover {
  background: var(--accent-bg);
  border-color: var(--accent);
  color: var(--accent);
}

main {
  padding-bottom: 3rem;
}

details {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 0.6rem;
  overflow: hidden;
}

details[open] {
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

summary {
  cursor: pointer;
  padding: 0.85rem 1.1rem;
  font-size: 1rem;
  list-style: none;
  user-select: none;
  position: relative;
  padding-left: 2.1rem;
}

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

summary::before {
  content: "+";
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  font-weight: 600;
  color: var(--accent);
  width: 0.8rem;
  display: inline-block;
  text-align: center;
  transition: transform 0.15s ease;
}

details[open] > summary::before {
  content: "\2212"; /* minus sign */
}

summary:hover {
  background: var(--accent-bg);
}

.body {
  padding: 0.25rem 1.1rem 1rem 1.1rem;
  border-top: 1px solid var(--border);
}

.body h3 {
  font-size: 1rem;
  margin: 1.1rem 0 0.4rem 0;
  color: var(--accent);
}

.body p {
  margin: 0.6rem 0;
}

.body ul {
  margin: 0.5rem 0;
  padding-left: 1.3rem;
}

.body li {
  margin: 0.25rem 0;
}

.body ul ul {
  margin-top: 0.3rem;
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

a:hover {
  text-decoration-thickness: 2px;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--code-bg);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
}

footer {
  padding-top: 1.25rem;
  padding-bottom: 2rem;
  border-top: 1px solid var(--border);
  margin-top: 1.5rem;
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
}

@media (max-width: 480px) {
  body { font-size: 16px; }
  header h1 { font-size: 1.5rem; }
  header, main, footer { padding: 0 1rem; }
  summary { padding: 0.75rem 0.85rem 0.75rem 1.9rem; }
  summary::before { left: 0.8rem; }
  .body { padding: 0.25rem 0.85rem 0.85rem 0.85rem; }
}