:root {
  --bg: #fdf6e9;
  --panel: #ffffff;
  --text: #443c2f;
  --muted: #a09680;
  --accent: #f59e0b;
  --accent-dark: #d97706;
  --ok: #22a05c;
  --ng: #e0442c;
  --learning: #4f86e0;
  --unseen: #d9d2c4;
  --border: #eadfc8;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: "Hiragino Maru Gothic ProN", "Hiragino Sans", "Noto Sans JP", sans-serif;
  -webkit-font-smoothing: antialiased;
  touch-action: pan-y;
}

#app {
  max-width: 640px;
  margin: 0 auto;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  padding: calc(12px + env(safe-area-inset-top)) 16px calc(16px + env(safe-area-inset-bottom));
}

section { display: flex; flex-direction: column; flex: 1; min-height: 0; }
section[hidden] { display: none; }

button { font-family: inherit; cursor: pointer; }

.big-btn {
  border: 0;
  border-radius: 18px;
  background: var(--accent);
  color: #fff;
  font-size: 22px;
  font-weight: 700;
  padding: 18px;
  width: 100%;
  box-shadow: 0 4px 0 var(--accent-dark);
  margin-top: 12px;
}
.big-btn:active { transform: translateY(3px); box-shadow: 0 1px 0 var(--accent-dark); }
.big-btn:disabled { opacity: 0.6; }

.mid-btn {
  border: 2px solid var(--border);
  border-radius: 14px;
  background: var(--panel);
  color: var(--text);
  font-size: 17px;
  font-weight: 600;
  padding: 13px 18px;
  width: 100%;
  margin-top: 12px;
}
.mid-btn.slim { width: auto; flex: 1; padding: 10px 8px; font-size: 15px; margin-top: 0; }
.mid-btn.ok { border-color: var(--ok); color: var(--ok); }
.mid-btn.ng { border-color: var(--ng); color: var(--ng); }

.text-btn {
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 15px;
  padding: 8px;
}

.icon-btn {
  border: 0;
  background: transparent;
  color: var(--muted);
  width: 42px;
  height: 42px;
  padding: 8px;
}
.icon-btn svg { width: 100%; height: 100%; }

/* ---------- ホーム ---------- */

.home-head { display: flex; align-items: flex-start; justify-content: space-between; margin-top: 8px; }
h1 { font-size: 30px; margin: 8px 0 4px; }
h1 .grade {
  display: inline-block;
  font-size: 15px;
  color: #fff;
  background: var(--accent);
  border-radius: 999px;
  padding: 3px 12px;
  margin-left: 10px;
  vertical-align: middle;
}

.stats-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 16px; }
.stat {
  background: var(--panel);
  border-radius: 14px;
  padding: 12px 14px;
  font-size: 14px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-left: 6px solid var(--unseen);
}
.stat b { font-size: 26px; color: var(--text); }
.st-done { border-left-color: var(--accent); }
.st-learning { border-left-color: var(--learning); }
.st-weak { border-left-color: var(--ng); }

.today-msg { font-size: 18px; text-align: center; margin: 28px 0 4px; }

/* ---------- クイズ ---------- */

.quiz-head { display: flex; align-items: center; gap: 10px; min-height: 40px; }
.progress { font-size: 16px; font-weight: 700; color: var(--muted); }
.retry-badge {
  font-size: 13px;
  color: #fff;
  background: var(--learning);
  border-radius: 999px;
  padding: 3px 10px;
}

.sentence {
  background: var(--panel);
  border-radius: 16px;
  padding: 20px 18px;
  font-size: 27px;
  line-height: 1.8;
  margin-top: 8px;
  min-height: 96px;
}
.blank {
  display: inline-block;
  border: 3px solid var(--ng);
  border-radius: 8px;
  color: var(--ng);
  font-weight: 700;
  padding: 0 10px;
  margin: 0 3px;
  background: #fff5f2;
}

.hint { color: var(--muted); font-size: 14px; text-align: center; margin: 10px 0 6px; }

.canvas-wrap {
  width: min(100%, 46dvh);
  margin: 0 auto;
}
#pad {
  display: block;
  border: 3px solid var(--border);
  border-radius: 16px;
  touch-action: none;
  background: #fff;
}

.pad-controls {
  display: flex;
  gap: 10px;
  width: min(100%, 46dvh);
  margin: 10px auto 0;
}

/* ---------- 結果オーバーレイ ---------- */

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(60, 50, 30, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 20;
}
.overlay[hidden] { display: none; }

.result-card, .modal-card {
  background: var(--panel);
  border-radius: 22px;
  padding: 22px 24px;
  width: min(440px, 100%);
  max-height: 88dvh;
  overflow-y: auto;
  text-align: center;
}

.result-mark { font-size: 64px; font-weight: 800; line-height: 1.1; }
.result-mark.ok { color: var(--ok); }
.result-mark.ng { color: var(--ng); }

.result-kanji {
  font-family: "Hiragino Mincho ProN", serif;
  font-size: 96px;
  line-height: 1.2;
}

.result-sentence { font-size: 20px; line-height: 1.7; margin-top: 6px; }
.result-sentence .filled, .filled {
  color: var(--ng);
  font-family: "Hiragino Mincho ProN", serif;
  font-size: 1.2em;
  font-weight: 700;
  margin: 0 2px;
}

.result-info { color: var(--muted); font-size: 15px; margin: 10px 0 0; }
.result-buttons { margin-top: 8px; }
.result-buttons .text-btn { margin-top: 10px; }

/* ---------- まとめ ---------- */

.summary-card {
  background: var(--panel);
  border-radius: 22px;
  padding: 28px 24px;
  margin: auto 0;
  text-align: center;
}
.summary-card h2 { font-size: 28px; margin: 0; }
.summary-score { font-size: 20px; margin: 12px 0; }
.summary-wrong p { color: var(--muted); font-size: 14px; margin-bottom: 8px; }
.wrong-row { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.wrong-row span {
  font-size: 30px;
  font-family: "Hiragino Mincho ProN", serif;
  background: #fff5f2;
  border: 2px solid var(--ng);
  color: var(--ng);
  border-radius: 10px;
  padding: 4px 10px;
}

/* ---------- いちらん ---------- */

.legend { display: flex; gap: 12px; flex-wrap: wrap; margin: 8px 0 12px; }
.lg { font-size: 13px; color: var(--muted); padding-left: 20px; position: relative; }
.lg::before {
  content: "";
  position: absolute;
  left: 0; top: 50%;
  transform: translateY(-50%);
  width: 14px; height: 14px;
  border-radius: 4px;
}
.lg-unseen::before { background: var(--unseen); }
.lg-learning::before { background: var(--learning); }
.lg-weak::before { background: var(--ng); }
.lg-done::before { background: var(--accent); }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(46px, 1fr));
  gap: 6px;
  overflow-y: auto;
  padding-bottom: 12px;
}
.cell {
  border: 0;
  border-radius: 10px;
  aspect-ratio: 1;
  font-size: 22px;
  color: #fff;
  font-family: "Hiragino Mincho ProN", serif;
}
.cell-unseen { background: var(--unseen); color: #8f866f; }
.cell-learning { background: var(--learning); }
.cell-weak { background: var(--ng); }
.cell-done { background: var(--accent); }

/* ---------- モーダル ---------- */

.modal-card h2 { margin: 0 0 8px; }
.modal-card .note { color: var(--muted); font-size: 14px; line-height: 1.8; }
.detail-kanji {
  font-family: "Hiragino Mincho ProN", serif;
  font-size: 88px;
  line-height: 1.2;
}
.detail-status {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  border-radius: 999px;
  padding: 4px 14px;
  margin: 4px 0 10px;
  background: var(--unseen);
}
.ds-learning { background: var(--learning); }
.ds-weak { background: var(--ng); }
.ds-done { background: var(--accent); }
.ds-unseen { background: var(--unseen); color: #8f866f; }
.detail-stats { color: var(--muted); font-size: 14px; line-height: 1.8; }

.file-btn { display: block; text-align: center; }

/* ---------- トースト ---------- */

#toast {
  position: fixed;
  left: 50%;
  bottom: calc(32px + env(safe-area-inset-bottom));
  transform: translateX(-50%);
  background: rgba(68, 60, 47, 0.94);
  color: #fff;
  font-size: 15px;
  padding: 10px 18px;
  border-radius: 22px;
  max-width: 86vw;
  z-index: 30;
}