:root {
  --ink: #1c241c;
  --muted: #5c675c;
  --paper: #f4f0e4;
  --card: #fffaf1;
  --line: #d7d0c0;
  --green: #1f5c45;
  --green-deep: #14382b;
  --moss: #e5f0e8;
  --seal: #9d2c2c;
  --amber: #8a5a12;
  --bad: #8d2f2f;
  --good: #1d6b45;
  --shadow: 0 12px 30px rgba(28, 36, 28, 0.08);
  --sans: "Yu Gothic UI", "Hiragino Sans", "Noto Sans JP", sans-serif;
  --serif: "Yu Mincho", "Hiragino Mincho ProN", "Noto Serif JP", serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--sans);
  background:
    radial-gradient(circle at top left, rgba(31, 92, 69, 0.08), transparent 28rem),
    linear-gradient(180deg, #efe8d8 0%, var(--paper) 18rem);
}
button, input, select { font: inherit; color: inherit; }
button:disabled { opacity: 0.45; cursor: not-allowed; transform: none; }
h1, h2, h3 { font-family: var(--serif); font-weight: 700; letter-spacing: 0.02em; }
.skip {
  position: absolute; left: 1rem; top: -4rem;
  background: var(--green-deep); color: white; padding: 0.5rem 0.8rem;
}
.skip:focus { top: 1rem; }

.wrap { width: min(1080px, calc(100% - 2rem)); margin: 0 auto; }
.topbar {
  display: flex; justify-content: space-between; gap: 1rem; align-items: center;
  padding: 1.1rem 0 0.4rem;
}
.brand { display: flex; gap: 0.8rem; align-items: center; text-decoration: none; color: inherit; }
.seal {
  width: 3rem; height: 3rem; border: 2px solid var(--seal); color: var(--seal);
  border-radius: 50%; display: grid; place-items: center;
  font-family: var(--serif); font-weight: 700; transform: rotate(-8deg);
  background: rgba(157, 44, 44, 0.05);
}
.brand small { display: block; color: var(--muted); letter-spacing: 0.08em; }
.brand strong { font-family: var(--serif); font-size: 1.25rem; }
.ghost, .solid, .choice, .mini {
  border-radius: 999px; border: 1px solid var(--line); background: transparent;
  padding: 0.55rem 0.95rem;
}
.solid { background: var(--green); color: white; border-color: var(--green); }
.solid:hover, .ghost:hover, .mini:hover { transform: translateY(-1px); }
.ghost.danger { color: var(--bad); border-color: #e3c2c2; }
.layout { padding-bottom: 3rem; }
.hero {
  display: grid; grid-template-columns: 1.4fr 0.8fr; gap: 1.2rem; align-items: end;
  padding: 1rem 0 1.2rem;
}
.hero h1 { font-size: clamp(2rem, 4vw, 3.3rem); line-height: 1.25; margin: 0 0 0.6rem; }
.lede { font-size: 1.05rem; line-height: 1.75; margin: 0; }
.note {
  background: var(--card); border: 1px solid var(--line); border-radius: 1rem;
  padding: 1rem 1.1rem; box-shadow: var(--shadow); line-height: 1.7; color: var(--muted);
}
.note strong { color: var(--ink); }
.cards, .modes, .topics { display: grid; gap: 0.8rem; }
.cards { grid-template-columns: repeat(4, 1fr); }
.modes { grid-template-columns: 1.2fr 1fr 1fr; }
.license, .mode, .topic-row, .panel {
  background: var(--card); border: 1px solid var(--line); border-radius: 1.1rem;
  box-shadow: var(--shadow); text-align: left;
}
.license, .mode { padding: 1rem; }
.license { min-height: 11rem; display: flex; flex-direction: column; gap: 0.35rem; }
.license em, .kicker { color: var(--seal); font-style: normal; font-size: 0.82rem; letter-spacing: 0.08em; }
.license strong, .mode strong { font-family: var(--serif); font-size: 1.25rem; }
.license span, .mode span, .sub { color: var(--muted); line-height: 1.6; }
.section-title { margin: 1.4rem 0 0.7rem; font-size: 1.35rem; }
.bar-row { display: grid; grid-template-columns: 9rem 1fr auto; gap: 0.7rem; align-items: center; }
.bar { height: 0.7rem; background: #ece6d8; border-radius: 99px; overflow: hidden; }
.bar > span { display: block; height: 100%; background: var(--green); }
.bar.bad > span { background: var(--seal); }
.quiz-head, .row-between { display: flex; justify-content: space-between; gap: 1rem; align-items: center; }
.timer { font-variant-numeric: tabular-nums; font-family: var(--serif); font-size: 1.4rem; }
.timer.warn { color: var(--seal); }
.progress { height: 0.35rem; background: #e6e0d2; border-radius: 99px; margin: 0.8rem 0 1rem; }
.progress > span { display: block; height: 100%; background: var(--green); }
.stem { font-size: 1.25rem; line-height: 1.7; margin: 0.4rem 0 1rem; }
.stem.invert { box-decoration-break: clone; background: #f8e8e4; border-radius: 0.4rem; }
.choices { display: grid; gap: 0.7rem; }
.choice {
  border-radius: 1rem; padding: 0.9rem 1rem; display: grid;
  grid-template-columns: auto 1fr; gap: 0.8rem; text-align: left; background: white;
  line-height: 1.65;
}
.choice .mark {
  width: 1.8rem; height: 1.8rem; border-radius: 50%; display: grid; place-items: center;
  border: 1px solid var(--line); font-family: var(--serif);
}
.choice.selected { border-color: var(--green); background: var(--moss); }
.choice.good { border-color: var(--good); background: #e7f6ee; }
.choice.bad { border-color: var(--bad); background: #fdeeee; }
.choice:disabled { cursor: default; }
.verdict {
  margin-top: 1rem; padding: 0.8rem 1rem; border-radius: 0.7rem;
  font-size: 1.15rem; line-height: 1.6;
}
.verdict.good { background: #e7f6ee; color: var(--good); }
.verdict.bad { background: #fdeeee; color: var(--bad); }
.explain {
  margin-top: 0.7rem; padding: 0.9rem 1rem; border-left: 4px solid var(--green);
  background: white; border-radius: 0.7rem; line-height: 1.7;
}
.nav { display: flex; justify-content: space-between; gap: 0.6rem; margin-top: 1rem; flex-wrap: wrap; }
.dots { display: flex; flex-wrap: wrap; gap: 0.35rem; margin: 0.8rem 0; }
.dots button {
  width: 2rem; height: 2rem; border-radius: 0.45rem; border: 1px solid var(--line); background: white;
}
.dots button.on { background: var(--green); color: white; border-color: var(--green); }
.dots button.filled { box-shadow: inset 0 0 0 2px var(--green); }
.dots button.miss { background: #f8e4e4; }
.dots button.hit { background: var(--moss); }
.score {
  display: flex; gap: 1rem; align-items: baseline;
}
.score b { font-family: var(--serif); font-size: 3rem; }
.pass { color: var(--good); }
.fail { color: var(--bad); }
.panel { padding: 1rem 1.1rem; margin-top: 0.8rem; overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 0.55rem 0.3rem; border-bottom: 1px solid var(--line); vertical-align: middle; }
.topic-row { width: 100%; padding: 0.8rem 1rem; display: grid; grid-template-columns: 1fr auto; gap: 0.4rem; }
.filters { display: flex; flex-wrap: wrap; gap: 0.45rem; margin: 0.6rem 0 1rem; }
.filters button[aria-pressed="true"] { background: var(--green-deep); color: white; border-color: var(--green-deep); }
.empty { padding: 1.5rem; text-align: center; color: var(--muted); }
.footer { color: var(--muted); font-size: 0.85rem; line-height: 1.6; padding: 1rem 0 2rem; }
.warn-list { background: #fff4f2; border: 1px solid #efc8c2; padding: 0.8rem 1rem; border-radius: 0.8rem; }
@media (max-width: 860px) {
  .hero, .cards, .modes, .bar-row { grid-template-columns: 1fr; }
  .topbar { align-items: flex-start; }
}