:root {
  --bg: #12121a;
  --panel: #1d1d29;
  --ink: #e8e6f0;
  --muted: #9a97ab;
  --accent: #ff7ab6;
  --ok: #6ee7a0;
  --no: #ff8a8a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  min-height: 100vh;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 24px;
  border-bottom: 1px solid #2a2a3a;
}

.logo { font-weight: 700; color: var(--accent); text-decoration: none; font-size: 1.1rem; }
.links a { color: var(--muted); text-decoration: none; margin-left: 18px; }
.links a:hover { color: var(--ink); }

main { max-width: 760px; margin: 0 auto; padding: 24px; }

.jp { font-family: "Hiragino Sans", "Noto Sans JP", "Yu Gothic", sans-serif; }

/* home */
.hero { text-align: center; padding-top: 40px; }
.hero h1 { font-size: 2.4rem; }
.hero h1 .jp { color: var(--accent); }
.sub { color: var(--muted); }

.start {
  background: var(--panel);
  border: 1px solid #2a2a3a;
  border-radius: 14px;
  padding: 24px;
  margin: 28px auto 12px;
  max-width: 420px;
  text-align: left;
}
.start h2 { font-size: 1rem; margin-top: 0; color: var(--muted); font-weight: 600; }
.group { display: flex; gap: 10px; align-items: center; padding: 8px 4px; cursor: pointer; }
.group input { accent-color: var(--accent); width: 16px; height: 16px; }
.hint { color: var(--muted); }
.hint a { color: var(--accent); }

/* buttons & inputs */
.btn {
  display: inline-block;
  background: var(--accent);
  color: #1a1024;
  border: none;
  border-radius: 10px;
  padding: 10px 22px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
}
.btn:hover { filter: brightness(1.1); }
.btn:disabled { opacity: .5; cursor: wait; }

input[type="text"] {
  background: #14141e;
  border: 1px solid #34344a;
  color: var(--ink);
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 1.15rem;
  width: 220px;
  text-align: center;
}
input[type="text"]:focus { outline: 2px solid var(--accent); border-color: transparent; }

/* quiz card */
.quiz { text-align: center; padding-top: 40px; }
.card {
  background: var(--panel);
  border: 1px solid #2a2a3a;
  border-radius: 18px;
  padding: 36px 28px 20px;
  max-width: 480px;
  margin: 0 auto;
}
.card.ok { border-color: var(--ok); }
.card.no { border-color: var(--no); }

.kana {
  font-family: "Hiragino Sans", "Noto Sans JP", "Yu Gothic", sans-serif;
  font-size: 8rem;
  line-height: 1.1;
}
.verdict { font-size: 1.1rem; min-height: 1.4em; }
.ok-text { color: var(--ok); }
.no-text { color: var(--no); }

.card form { display: flex; gap: 10px; justify-content: center; margin-top: 8px; }
.meta { color: var(--muted); font-size: .85rem; margin-top: 26px; }
.done-title { margin-top: 0; }
.score { font-size: 1.4rem; }

/* chart */
.chart h2 { color: var(--muted); font-size: 1rem; font-weight: 600; margin: 26px 0 10px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(72px, 1fr)); gap: 8px; }
.cell {
  background: var(--panel);
  border: 1px solid #2a2a3a;
  border-radius: 10px;
  padding: 8px 4px;
  text-align: center;
}
.cell .k {
  display: block;
  font-family: "Hiragino Sans", "Noto Sans JP", "Yu Gothic", sans-serif;
  font-size: 1.9rem;
}
.cell .r { color: var(--muted); font-size: .85rem; }