/* ============================================
   Kirikae Quest — Duolingo-style prototype
   ============================================ */
:root {
  --green: #22c55e;
  --green-dark: #16a34a;
  --green-shadow: #15803d;
  --red: #ef4444;
  --red-dark: #b91c1c;
  --orange: #f97316;
  --gold: #fbbf24;
  --blue: #3b82f6;
  --ink: #1f2937;
  --ink-soft: #6b7280;
  --bg: #f8faf7;
  --card: #ffffff;
  --line: #e5e7eb;
  --radius: 18px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", "Hiragino Sans", "Noto Sans", "Noto Sans JP",
    "Noto Sans SC", "Noto Sans Devanagari", sans-serif;
  background: var(--bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}

#app { max-width: 480px; margin: 0 auto; min-height: 100vh; padding: 16px 16px 48px; }

/* ---------- shared ---------- */
.btn {
  display: block; width: 100%; border: none; cursor: pointer;
  font-size: 17px; font-weight: 700; text-align: center;
  padding: 15px 20px; border-radius: 14px; color: #fff;
  background: var(--green);
  box-shadow: 0 4px 0 var(--green-shadow);
  transition: transform .05s ease, box-shadow .05s ease, filter .15s;
}
.btn:active { transform: translateY(3px); box-shadow: 0 1px 0 var(--green-shadow); }
.btn.secondary { background: #fff; color: var(--ink); box-shadow: 0 4px 0 var(--line); border: 2px solid var(--line); }
.btn.danger { background: var(--red); box-shadow: 0 4px 0 var(--red-dark); }
.btn:disabled { filter: grayscale(.6) opacity(.6); cursor: default; }
.btn + .btn { margin-top: 12px; }

.card {
  background: var(--card); border: 2px solid var(--line);
  border-radius: var(--radius); padding: 20px; margin-bottom: 14px;
}

/* ---------- header / stats ---------- */
.topbar { display: flex; align-items: center; justify-content: space-between; padding: 6px 2px 16px; }
.stat { font-weight: 800; font-size: 15px; display: flex; align-items: center; gap: 5px; }
.stat.streak { color: var(--orange); }
.stat.xp { color: var(--gold); }
.stat.hearts { color: var(--red); }
.lang-chip {
  border: 2px solid var(--line); background: #fff; border-radius: 999px;
  padding: 5px 12px; font-weight: 700; font-size: 13px; cursor: pointer; color: var(--ink-soft);
}

/* ---------- mascot / hero ---------- */
.hero { text-align: center; padding: 8px 0 4px; }
.hero .mascot { width: 130px; height: auto; }
.hero h1 { font-size: 26px; font-weight: 900; letter-spacing: -.5px; margin-top: 4px; }
.hero p { color: var(--ink-soft); font-size: 14px; margin: 6px 0 14px; line-height: 1.5; }

/* ---------- language grid ---------- */
.lang-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.lang-btn {
  background: #fff; border: 2px solid var(--line); border-radius: 14px;
  box-shadow: 0 3px 0 var(--line);
  padding: 14px 10px; font-size: 15px; font-weight: 700; cursor: pointer; text-align: center;
}
.lang-btn:active { transform: translateY(2px); box-shadow: 0 1px 0 var(--line); }
.lang-btn .flag { font-size: 22px; display: block; margin-bottom: 4px; }
.lang-btn.review-note { grid-column: 1 / -1; font-size: 12px; color: var(--ink-soft); border-style: dashed; box-shadow: none; cursor: default; }

/* ---------- unit path ---------- */
.unit-title { font-size: 13px; font-weight: 800; letter-spacing: 1px; text-transform: uppercase; color: var(--ink-soft); margin: 18px 4px 10px; }
.node {
  display: flex; align-items: center; gap: 14px; width: 100%;
  background: #fff; border: 2px solid var(--line); border-radius: var(--radius);
  box-shadow: 0 4px 0 var(--line);
  padding: 16px; margin-bottom: 12px; cursor: pointer; text-align: left; font-family: inherit;
}
.node:active { transform: translateY(2px); box-shadow: 0 1px 0 var(--line); }
.node .icon {
  width: 52px; height: 52px; border-radius: 50%; flex: none;
  display: flex; align-items: center; justify-content: center; font-size: 24px;
  background: var(--green); color: #fff; box-shadow: 0 3px 0 var(--green-shadow);
}
.node.exam .icon { background: var(--blue); box-shadow: 0 3px 0 #1d4ed8; }
.node.locked { opacity: .55; cursor: default; }
.node.locked .icon { background: #d1d5db; box-shadow: 0 3px 0 #9ca3af; }
.node .meta { flex: 1; }
.node .meta h3 { font-size: 16px; font-weight: 800; }
.node .meta p { font-size: 13px; color: var(--ink-soft); margin-top: 2px; line-height: 1.45; }
.node .badge { font-size: 12px; font-weight: 800; color: var(--green-dark); }

/* ---------- quiz ---------- */
.quiz-top { display: flex; align-items: center; gap: 12px; padding: 4px 0 18px; }
.quiz-top .quit { font-size: 22px; color: var(--ink-soft); background: none; border: none; cursor: pointer; }
.progress { flex: 1; height: 14px; background: var(--line); border-radius: 999px; overflow: hidden; }
.progress > div { height: 100%; background: var(--green); border-radius: 999px; transition: width .3s ease; }
.quiz-hearts { font-weight: 800; color: var(--red); font-size: 15px; }
.timer { font-weight: 800; color: var(--blue); font-size: 15px; font-variant-numeric: tabular-nums; }

.q-cat { font-size: 12px; font-weight: 800; letter-spacing: 1px; text-transform: uppercase; color: var(--green-dark); margin-bottom: 8px; }
.q-text { font-size: 19px; font-weight: 700; line-height: 1.55; margin-bottom: 18px; }
.q-sign { text-align: center; margin: 4px 0 18px; }
.q-sign svg { width: 130px; height: auto; }

.answers { display: grid; gap: 10px; }
.answers.tf { grid-template-columns: 1fr 1fr; }
.ans-btn {
  background: #fff; border: 2px solid var(--line); border-radius: 14px;
  box-shadow: 0 4px 0 var(--line);
  padding: 16px 12px; font-size: 17px; font-weight: 700; cursor: pointer; font-family: inherit; text-align: center;
}
.ans-btn:active { transform: translateY(2px); box-shadow: 0 1px 0 var(--line); }
.ans-btn.picked-right { border-color: var(--green); background: #f0fdf4; color: var(--green-dark); box-shadow: 0 4px 0 var(--green); }
.ans-btn.picked-wrong { border-color: var(--red); background: #fef2f2; color: var(--red-dark); box-shadow: 0 4px 0 var(--red); }
.ans-btn.reveal { border-color: var(--green); }
.ans-btn:disabled { cursor: default; }

.feedback { border-radius: var(--radius); padding: 16px; margin-top: 16px; }
.feedback.good { background: #f0fdf4; border: 2px solid var(--green); }
.feedback.bad { background: #fef2f2; border: 2px solid var(--red); }
.feedback h4 { font-size: 16px; font-weight: 900; margin-bottom: 6px; }
.feedback.good h4 { color: var(--green-dark); }
.feedback.bad h4 { color: var(--red-dark); }
.feedback p { font-size: 14px; line-height: 1.55; }
.feedback .ref { font-size: 12px; color: var(--ink-soft); margin-top: 8px; }

/* ---------- results ---------- */
.result { text-align: center; padding-top: 24px; }
.result .big { font-size: 56px; }
.result h2 { font-size: 24px; font-weight: 900; margin: 8px 0 4px; }
.result .sub { color: var(--ink-soft); font-size: 14px; margin-bottom: 20px; line-height: 1.5; }
.result-stats { display: flex; gap: 10px; justify-content: center; margin-bottom: 20px; }
.result-stat {
  border: 2px solid var(--line); border-radius: 14px; padding: 10px 16px; min-width: 90px; background: #fff;
}
.result-stat .v { font-size: 20px; font-weight: 900; }
.result-stat .k { font-size: 11px; font-weight: 700; color: var(--ink-soft); text-transform: uppercase; letter-spacing: .5px; }
.result-stat.pass .v { color: var(--green-dark); }
.result-stat.fail .v { color: var(--red-dark); }

.review-list { text-align: left; margin-top: 8px; }
.review-list .card { padding: 14px 16px; }
.review-list .card p { font-size: 14px; line-height: 1.5; }
.review-list .card .ref { font-size: 12px; color: var(--ink-soft); margin-top: 6px; }

.footer-note { text-align: center; font-size: 11px; color: var(--ink-soft); margin-top: 28px; line-height: 1.6; }