:root {
  --bg: #ffffff;
  --fg: #111111;
  --muted: #3d3d3d;
  --accent: #0b3d91;
  --accent-fg: #ffffff;
  --border: #111111;
  --focus: #b35c00;
  --card: #f3f5f9;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #101114; --fg: #f5f5f5; --muted: #d0d0d0; --accent: #8ab4ff; --accent-fg: #0a0a0a; --border: #f5f5f5; --focus: #ffb347; --card: #1b1d22; }
}
* { box-sizing: border-box; }
html { font-size: 125%; } /* 20px base for easy reading */
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.5;
}
header, main, footer { max-width: 44rem; margin: 0 auto; padding: 0 1rem; }
header { padding-top: 1.5rem; }
h1 { font-size: 2.2rem; margin: 0 0 .25rem; }
.tag { font-size: 1.1rem; color: var(--muted); margin-top: 0; }
fieldset { border: 2px solid var(--border); border-radius: .6rem; margin: 1.25rem 0; padding: 1rem; background: var(--card); }
legend { font-size: 1.3rem; font-weight: 700; padding: 0 .4rem; }
.step { display: inline-block; background: var(--accent); color: var(--accent-fg); border-radius: 50%; width: 1.8rem; height: 1.8rem; text-align: center; margin-right: .3rem; }
.choice { display: flex; align-items: center; gap: .8rem; padding: .8rem; margin: .5rem 0; border: 2px solid var(--border); border-radius: .5rem; background: var(--bg); cursor: pointer; min-height: 3.2rem; }
.choice input { width: 1.6rem; height: 1.6rem; flex: none; accent-color: var(--accent); }
.choice:has(input:checked) { outline: 4px solid var(--accent); }
.choice .day { font-size: .95rem; color: var(--muted); display: block; }
button[type=submit], a.big {
  display: block; width: 100%; font: inherit; font-size: 1.35rem; font-weight: 700; text-align: center;
  padding: 1rem; border: 3px solid var(--border); border-radius: .6rem;
  background: var(--accent); color: var(--accent-fg); cursor: pointer; text-decoration: none;
}
button[disabled] { opacity: .5; cursor: not-allowed; }
a.save { display: inline-block; margin: .4rem 0 0 .2rem; font-size: 1.05rem; color: var(--fg); }
a { color: var(--accent); }
:focus-visible { outline: 4px solid var(--focus); outline-offset: 3px; }
#status { font-size: 1.15rem; min-height: 1.6rem; font-weight: 600; }
#status.error { color: #b00020; }
@media (prefers-color-scheme: dark) { #status.error { color: #ff8a80; } }
#results { border: 3px solid var(--accent); border-radius: .6rem; padding: 1rem; margin: 1rem 0; }
#results h2 { margin-top: 0; }
.notice { border: 2px solid var(--border); padding: 1rem; }
footer { color: var(--muted); font-size: .85rem; padding-bottom: 2rem; border-top: 1px solid var(--muted); margin-top: 2rem; padding-top: 1rem; }
.skip { position: absolute; left: -999px; } .skip:focus { left: 1rem; top: 1rem; background: var(--bg); padding: .5rem; z-index: 9; }
@media (prefers-reduced-motion: no-preference) { button, a { transition: opacity .15s; } }
.choice .hint { display: block; font-size: .95rem; color: var(--muted); margin-top: .2rem; }
.brand { display: flex; align-items: center; gap: .6rem; margin-bottom: 1rem; }
.mascot { width: 5.5rem; height: auto; flex: none; }
.brand h1 { margin: 0; flex: 1; min-width: 0; }
.tiles { display: block; width: 100%; max-width: 30rem; height: auto; }
@media (min-width: 30rem) { .mascot { width: 7.5rem; } .brand { gap: 1rem; } }
@media (min-width: 40rem) { .mascot { width: 9.5rem; } }
.mascot { background: #fffaf0; border-radius: 1rem; padding: .3rem; }
.why { border-left: 6px solid var(--accent); padding: .1rem 0 .1rem 1rem; margin: 1.5rem 0; }
.why h2 { font-size: 1.4rem; margin: 0 0 .4rem; }
.why p { margin: 0; }