:root {
  --bg: #f4f7fb;
  --surface: #ffffff;
  --text: #1c2430;
  --muted: #5d6b7e;
  --border: #dde4ee;
  --accent: #2f7d4f;
  --accent-text: #ffffff;
  --danger: #b3261e;
  --radius: 14px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161c;
    --surface: #1c222b;
    --text: #e8edf3;
    --muted: #9aa7b8;
    --border: #2d3642;
    --accent: #4fb477;
    --accent-text: #0b1a11;
    --danger: #f2877f;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}
main { max-width: 640px; margin: 0 auto; padding: 24px 16px 64px; }
h1 { font-size: 1.6rem; margin: 0 0 4px; }
h2 { font-size: 1.15rem; margin: 0; }
h3 { font-size: 0.95rem; margin: 0; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }
p { margin: 0 0 12px; }
.muted { color: var(--muted); }
.error { color: var(--danger); }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-top: 16px;
}
.card.highlight { border-color: var(--accent); border-width: 2px; }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.spread { justify-content: space-between; }
input {
  font: inherit;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  flex: 1;
  min-width: 0;
}
button {
  font: inherit;
  font-weight: 600;
  padding: 10px 16px;
  border-radius: 10px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--accent-text);
  cursor: pointer;
}
button.secondary { background: transparent; color: var(--accent); }
button.danger { background: transparent; color: var(--danger); border-color: transparent; padding: 6px 8px; }
button:disabled { opacity: 0.6; cursor: default; }
code.code { font-size: 1.05rem; letter-spacing: 0.08em; font-weight: 600; }
ul.devices { list-style: none; padding: 0; margin: 8px 0 0; }
ul.devices li { display: flex; justify-content: space-between; align-items: center; padding: 6px 0; border-top: 1px solid var(--border); }
.qr { background: #fff; border-radius: 10px; padding: 8px; width: 220px; max-width: 100%; margin: 12px 0; }
.qr svg { display: block; width: 100%; height: auto; }
.big { font-size: 2.2rem; text-align: center; margin-top: 48px; }
ul.friends { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 12px; }
ul.friends li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  font-size: 1.3rem;
  font-weight: 600;
}
.center { text-align: center; }
.status { text-align: center; color: var(--muted); margin: 8px 0 0; }
.dot { display: inline-block; width: 12px; height: 12px; border-radius: 50%; background: var(--border); margin-right: 12px; vertical-align: middle; }
.dot.on { background: #34c759; }
ul.friends button { font-size: 1.05rem; padding: 10px 20px; }
.big-button { font-size: 1.2rem; padding: 14px 24px; flex: 1; }
.card.ringing { border: 2px solid var(--accent); text-align: center; font-size: 1.3rem; font-weight: 600; }
.card.ringing p, .card.joinable p { margin-bottom: 12px; }
.card.joinable { text-align: center; font-size: 1.15rem; font-weight: 600; }
.card.call { text-align: center; border: 2px solid var(--accent); }
.card.call h2 { font-size: 1.3rem; }
.call-buttons { margin-top: 16px; }
button.leave { background: var(--danger); border-color: var(--danger); color: #fff; }
.live { color: #34c759; }
.sound-banner { display: block; width: 100%; margin-top: 16px; background: transparent; color: var(--text); border: 2px dashed var(--border); font-weight: 600; }
.card.ringing { animation: ring-pulse 1.2s ease-in-out infinite; }
@keyframes ring-pulse { 50% { border-color: transparent; } }
@media (prefers-reduced-motion: reduce) { .card.ringing { animation: none; } }
.card.notice { text-align: center; border: 2px solid var(--accent); }
.card.notice h2 { font-size: 1.4rem; margin-bottom: 8px; }
.card.notice button { margin-top: 12px; }

/* Home page introduction */
.hero { text-align: center; padding: 16px 0 8px; }
.hero img { border-radius: 18px; }
.hero h1 { font-size: 1.75rem; line-height: 1.25; margin: 16px auto 12px; max-width: 30ch; }
.hero .lead { font-size: 1.05rem; color: var(--muted); max-width: 52ch; margin: 0 auto; }
.hero-buttons { justify-content: center; margin-top: 20px; }
.card h2 + p.muted { margin-top: 6px; }
.card.never { border: 2px solid var(--accent); }
ul.points { list-style: none; padding: 0; margin: 12px 0 0; display: grid; gap: 12px; }
ul.points li { display: flex; gap: 12px; align-items: flex-start; }
ul.points strong { display: block; }
.mark { flex: none; display: grid; place-items: center; width: 26px; height: 26px; border-radius: 50%; font-size: 0.85rem; font-weight: 700; margin-top: 1px; }
.mark.no { background: color-mix(in srgb, var(--danger) 16%, transparent); color: var(--danger); }
.mark.yes { background: color-mix(in srgb, var(--accent) 18%, transparent); color: var(--accent); }
ol.steps { margin: 12px 0 0; padding-left: 1.4em; display: grid; gap: 8px; }
.actions { display: grid; gap: 0 16px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); margin-top: 16px; }
.actions .card { margin-top: 16px; }
.small { font-size: 0.85rem; margin-top: 24px; }
.link-preview { color: var(--muted); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.85rem; overflow-wrap: anywhere; }
.warning { background: color-mix(in srgb, #f5a623 12%, transparent); border-radius: 10px; padding: 10px 12px; margin: 10px 0; }
.warning p { margin: 0 0 8px; }
.warning p:last-child { margin: 0; }
button.link-button { background: none; border: none; color: var(--accent); padding: 2px 6px; font-weight: 600; font-size: 0.9rem; }
.card.live-now { border: 2px solid #34c759; }
.card.live-now.quiet { border: 2px solid var(--border); }
.card.live-now h2 { margin-bottom: 8px; }
.card.live-now p { margin: 4px 0; }
.status-line { margin: 2px 0 0; font-size: 0.95rem; }

/* The app icon, for a consistent look across pages. */
.brand { display: flex; align-items: center; gap: 12px; }
.brand img { border-radius: 12px; flex: none; }
.kid-logo { display: block; margin: 24px auto 0; border-radius: 14px; }
.kid-logo + .big { margin-top: 12px; }
.page-logo { display: block; border-radius: 14px; margin-bottom: 16px; }