/* P8 pages — the homepage's type and palette (but a white ground), kept in step with index.html by hand. */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #ffffff;  /* white, unlike the homepage's cream */
  --fg: oklch(0.3 0.012 25);
  --fg-dim: oklch(0.54 0.018 25);
  --fg-mid: oklch(0.53 0.02 25);
  --border: oklch(0.89 0.014 15);
  --accent: oklch(0.555 0.12 8);
  --accent-2: oklch(0.52 0.055 160);
  --display: 'IBM Plex Sans', system-ui, sans-serif;
  --body: 'Source Serif 4', Georgia, serif;
  --label: 'IBM Plex Sans', system-ui, sans-serif;
  --kbd-bg: rgba(255, 255, 255, 0.5);
  color-scheme: light dark;
}

/* Dark mode follows the system, like the app's own icon does: the same warm hues,
   lifted for a dark ground. Text keeps WCAG AA (4.5:1) against --bg. */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: oklch(0.19 0.008 25);
    --fg: oklch(0.93 0.008 25);
    --fg-dim: oklch(0.7 0.015 25);
    --fg-mid: oklch(0.74 0.016 25);
    --border: oklch(0.32 0.012 15);
    --accent: oklch(0.74 0.11 8);
    --accent-2: oklch(0.74 0.06 160);
    --kbd-bg: rgba(255, 255, 255, 0.06);
  }
}

html { background: var(--bg); color: var(--fg); }

body {
  font-family: var(--body);
  font-size: 1rem;
  line-height: 1.65;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: underline; text-decoration-color: var(--border); text-underline-offset: 0.18em; }
a:hover { color: var(--accent); text-decoration-color: currentColor; }

.wrap { max-width: 42rem; margin: 0 auto; padding: 0 1.5rem 4rem; }
@media (min-width: 640px) { .wrap { padding: 0 3rem 5rem; } }

.crumb {
  display: inline-block;
  margin-top: 2rem;
  font-family: var(--label);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-dim);
  text-decoration: none;
}
.crumb:hover { color: var(--accent); }

.hero {
  padding: 2rem 0 2.5rem;
  border-bottom: 1px solid var(--border);
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 1.5rem;
  align-items: center;
}

.hero picture { display: block; line-height: 0; }
.icon { width: 5.5rem; height: 5.5rem; }
@media (min-width: 480px) { .icon { width: 6.5rem; height: 6.5rem; } .hero { column-gap: 2rem; } }

h1 {
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(1.4rem, 4vw, 2rem);
  letter-spacing: 0.05em;
  line-height: 1.1;
  text-transform: uppercase;
  color: var(--accent);
}

.tagline { color: var(--fg-mid); font-size: 0.95rem; margin-top: 0.35rem; }

.download {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.55rem 1rem;
  border-radius: 0.6rem;
  background: var(--fg);
  color: var(--bg);
  font-family: var(--label);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
}
.download:hover { background: var(--accent); color: var(--bg); }

.meta {
  display: block;
  margin-top: 0.6rem;
  font-family: var(--label);
  font-size: 0.62rem;
  letter-spacing: 0.04em;
  color: var(--fg-dim);
}

section { padding: 2.5rem 0; border-bottom: 1px solid var(--border); }
section:last-of-type { border-bottom: none; }

h2 {
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(0.85rem, 2.2vw, 1rem);
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 1.25rem;
}

p + p { margin-top: 0.9rem; }

.qa { list-style: none; display: flex; flex-direction: column; gap: 1.35rem; }
.qa dt, .label {
  font-family: var(--label);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-mid);
  margin-bottom: 0.35rem;
}
.qa dd { font-size: 0.97rem; }
.qa div + div { margin-top: 1.35rem; }

kbd {
  font-family: ui-monospace, monospace;
  font-size: 0.8em;
  padding: 0.05em 0.35em;
  border: 1px solid var(--border);
  border-radius: 0.3em;
  background: var(--kbd-bg);
}

.fine { color: var(--fg-mid); font-size: 0.9rem; }

.stations { display: grid; grid-template-columns: 1fr; gap: 0.5rem 2rem; margin-bottom: 1.5rem; }
@media (min-width: 480px) { .stations { grid-template-columns: 1fr 1fr; grid-template-rows: repeat(4, auto); grid-auto-flow: column; } }
.stations div { display: flex; gap: 0.75rem; align-items: baseline; }
.stations dt {
  font-family: var(--label);
  font-size: 0.75rem;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  color: var(--fg-dim);
  width: 0.75rem;
}
.stations dd { font-size: 0.97rem; }
.stations span { color: var(--fg-mid); font-size: 0.85rem; margin-left: 0.3rem; }

.steps { padding-left: 1.25rem; display: flex; flex-direction: column; gap: 0.5rem; margin-bottom: 0.9rem; }
.steps li::marker { color: var(--fg-dim); font-family: var(--label); font-size: 0.85rem; }