:root {
  --bg: #f6f3ec;
  --surface: #ffffff;
  --ink: #1d1e24;
  --muted: #6b6c75;
  --line: #e4dfd3;
  --accent: #3b4cca;
  --accent-ink: #ffffff;
  --ok: #1f8a4c;
  --ok-bg: #e3f5e9;
  --ng: #c2412d;
  --ng-bg: #fbe7e2;
  --star: #e2a516;
  --b0: #e8e4da;
  --b1: #d9c7a6;
  --b2: #a6d98f;
  --b3: #5cbf6a;
  --b4: #f08fb1;
  --b5: #d8433a;
  --radius: 14px;
  --shadow: 0 1px 2px rgb(0 0 0 / .05), 0 4px 14px rgb(0 0 0 / .05);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16171c;
    --surface: #212229;
    --ink: #ecebe6;
    --muted: #9a9ba5;
    --line: #33343d;
    --accent: #8090ff;
    --accent-ink: #11131f;
    --ok: #5fd08a;
    --ok-bg: #1d3427;
    --ng: #ff8a75;
    --ng-bg: #3d2420;
    --b0: #2e2f37;
    --b1: #7a6a4e;
    --b2: #6a9a58;
    --b3: #3f9a4f;
    --b4: #c46b8c;
    --b5: #c8473e;
    --shadow: none;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Hiragino Sans", "Yu Gothic UI", "Meiryo", sans-serif;
  line-height: 1.7;
}
main { max-width: 640px; margin: 0 auto; padding: 8px 16px 64px; }
h1, h2 { line-height: 1.4; }
h2 { font-size: 1rem; margin: 0 0 12px; }
a { color: var(--accent); }

.top { max-width: 640px; margin: 0 auto; padding: 14px 16px 4px; }
.brand { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; font-size: 1.1rem; color: var(--ink); text-decoration: none; letter-spacing: .02em; }

.muted { color: var(--muted); }
.small { font-size: .85rem; }
.loading, .error { padding: 40px 0; text-align: center; }
.error { color: var(--ng); }
.row { display: flex; gap: 8px; flex-wrap: wrap; }

.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 18px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 10px 16px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--surface); color: var(--ink); font: inherit; font-weight: 600; cursor: pointer;
}
.btn:hover { border-color: var(--muted); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.primary:hover { filter: brightness(1.08); }
.btn.big { width: 100%; padding: 15px; font-size: 1.05rem; }
.btn.ghost { background: transparent; border-color: transparent; }
.btn.small { padding: 6px 10px; font-size: .85rem; }
.btn:focus-visible, .opt:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent) 50%, transparent); outline-offset: 2px; }

/* home */
.hero { text-align: center; padding: 20px 0 24px; }
.hero-label { margin: 0; color: var(--muted); font-size: .9rem; }
.hero-num { margin: 0; font-size: 3.4rem; font-weight: 800; line-height: 1.1; font-variant-numeric: tabular-nums; }
.hero-total { font-size: 1.2rem; font-weight: 600; color: var(--muted); }
.hero-sub { margin: 4px 0 14px; font-size: .8rem; color: var(--muted); }

.boxbar { display: flex; height: 10px; border-radius: 99px; overflow: hidden; background: var(--b0); gap: 2px; }
.seg { min-width: 4px; }
.seg.b0 { background: var(--b0); }
.seg.b1 { background: var(--b1); }
.seg.b2 { background: var(--b2); }
.seg.b3 { background: var(--b3); }
.seg.b4 { background: var(--b4); }
.seg.b5 { background: var(--b5); }

.today { display: grid; gap: 10px; text-align: center; }
.today p { margin: 0; }
.today-theme { font-size: .9rem; color: var(--muted); }
.today-theme strong { color: var(--ink); }
.today-done { font-weight: 700; color: var(--ok); }
.today-meta { font-size: .8rem; color: var(--muted); }

.fields, .backup { margin-top: 32px; }
.field-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.field { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 14px; display: grid; gap: 6px; }
.field-head { display: flex; align-items: center; gap: 8px; }
.field-icon { font-size: 1.2rem; }
.field-name { font-weight: 700; flex: 1; }
.field-count { font-size: .85rem; font-variant-numeric: tabular-nums; }
.field-units { margin: 0; }

/* play */
.play-top { display: flex; align-items: center; gap: 10px; margin-bottom: 18px; }
.progress { flex: 1; height: 8px; background: var(--b0); border-radius: 99px; overflow: hidden; }
.progress span { display: block; height: 100%; background: var(--accent); border-radius: 99px; transition: width .3s ease; }
.q-meta { margin: 0 0 6px; font-size: .85rem; color: var(--muted); }
.stars { color: var(--star); letter-spacing: .05em; margin-left: 4px; }
.stars .off { color: var(--line); }
.q-text { font-size: 1.3rem; margin: 0 0 22px; }

.options { display: grid; gap: 10px; }
.options.tf { grid-template-columns: 1fr 1fr; }
.opt {
  display: flex; align-items: center; gap: 12px; text-align: left;
  padding: 14px 16px; border-radius: 12px; border: 2px solid var(--line);
  background: var(--surface); color: var(--ink); font: inherit; font-size: 1rem; cursor: pointer;
  transition: transform .08s ease, border-color .15s;
}
.opt:hover:not(:disabled) { border-color: var(--accent); }
.opt:active:not(:disabled) { transform: scale(.98); }
.opt:disabled { cursor: default; opacity: .55; }
.options.tf .opt { justify-content: center; font-size: 2.2rem; font-weight: 700; padding: 18px; }
.opt-key { flex: none; width: 26px; height: 26px; border-radius: 7px; background: var(--b0); display: grid; place-items: center; font-size: .8rem; font-weight: 700; color: var(--muted); }
.opt.is-correct { opacity: 1; border-color: var(--ok); background: var(--ok-bg); animation: pop .35s ease; }
.opt.is-wrong { opacity: 1; border-color: var(--ng); background: var(--ng-bg); animation: shake .35s ease; }

.feedback { margin-top: 18px; padding: 16px; border-radius: var(--radius); border: 1px solid var(--line); background: var(--surface); animation: rise .25s ease; }
.feedback.ok { border-color: var(--ok); }
.feedback.ng { border-color: var(--ng); }
.fb-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; flex-wrap: wrap; }
.fb-verdict { font-size: 1.2rem; }
.feedback.ok .fb-verdict { color: var(--ok); }
.feedback.ng .fb-verdict { color: var(--ng); }
.fb-box { font-size: .9rem; color: var(--muted); }
.grow { display: inline-block; color: var(--ink); font-weight: 700; animation: pop .5s ease .1s both; }
.fb-answer { margin: 8px 0 0; }
.fb-explain { margin: 10px 0 14px; }
.fb-foot { display: flex; align-items: center; gap: 8px; }
.fb-foot .btn.primary { margin-left: auto; min-width: 120px; }
.flag.on { color: var(--star); }

/* result */
.result { text-align: center; padding-top: 12px; }
.result-label { margin: 0; color: var(--muted); }
.result-score { margin: 4px 0; font-size: 1.4rem; }
.result-score strong { font-size: 3.2rem; }
.result-list { list-style: none; padding: 0; margin: 20px 0 24px; text-align: left; display: grid; gap: 6px; }
.result-list li { display: flex; align-items: center; gap: 10px; padding: 10px 12px; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; }
.result-list .mark { font-weight: 800; width: 1.2em; text-align: center; }
.result-list .ok .mark { color: var(--ok); }
.result-list .ng .mark { color: var(--ng); }
.result-list .rq { flex: 1; font-size: .9rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.result-list .rbox { flex: none; font-size: .95rem; }
.result-list .rbox.up { animation: pop .5s ease both; }

@keyframes pop { 0% { transform: scale(.8); } 60% { transform: scale(1.08); } 100% { transform: scale(1); } }
@keyframes shake { 25% { transform: translateX(-4px); } 75% { transform: translateX(4px); } }
@keyframes rise { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}