@import url('https://fonts.googleapis.com/css2?family=DotGothic16&display=swap');

:root {
  --paper: #fdfdfd;
  --ink: #222;
  --accent: #0d9488;
  --muted: #888;
  --ok: #2ecc71;
  --ng: #e74c3c;
}

* { touch-action: manipulation; }

html, body {
  margin: 0;
  min-height: 100%;
  background: var(--paper);
  color: var(--ink);
  font-family: 'DotGothic16', sans-serif;
  -webkit-text-size-adjust: 100%;
}

.arcade {
  max-width: 480px;
  margin: 0 auto;
  box-sizing: border-box;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  padding: 12px 16px 24px;
}

.site-header {
  display: block;
  text-align: center;
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--accent);
  text-decoration: none;
  padding: 8px 0;
  margin-bottom: 14px;
  border-bottom: 2px solid var(--accent);
}
.site-header:active { background: #f0faf9; }

.arcade-header {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 10px;
}

.arcade-header h1 {
  font-size: 16px;
  margin: 0;
  flex-grow: 1;
}

.stage-nav {
  margin-top: 10px;
}

.stage-nav .back-btn {
  display: inline-block;
  font-size: 12px;
  color: var(--accent);
  border: 2px solid var(--accent);
  background: #fff;
  padding: 8px 14px;
  text-decoration: none;
}

.en {
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 1px;
  margin-left: 6px;
}

#hud {
  font-size: 12px;
  color: var(--muted);
  text-align: right;
  flex-shrink: 0;
}

#stage {
  position: relative;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  border: 3px solid var(--accent);
  background: #fff;
  padding: 16px;
  box-sizing: border-box;
  overflow: hidden;
}

/* オーバーレイ（スタート/リザルト） */
.arcade-overlay {
  position: absolute;
  inset: 0;
  background: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 18px;
  text-align: center;
  padding: 24px;
  box-sizing: border-box;
  z-index: 10;
}
.arcade-overlay h2 { font-size: 20px; color: var(--accent); margin: 0; }
.arcade-overlay p { font-size: 14px; line-height: 2; margin: 0; }

/* ボタン3状態 */
.btn {
  display: inline-block;
  font-family: inherit;
  font-size: 15px;
  color: var(--accent);
  background: #fff;
  border: 3px solid var(--accent);
  padding: 12px 22px;
  text-decoration: none;
  cursor: pointer;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn:disabled, .btn.disabled { border-color: #ccc; color: #aaa; background: #f4f4f4; pointer-events: none; }
.btn:active { transform: translate(1px, 1px); }

/* クイズ用 */
.question { font-size: 16px; text-align: center; margin: 0 0 12px; }
.choices { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: auto; }
.choices.cols-1 { grid-template-columns: 1fr; }
.choices .btn { font-size: 14px; padding: 14px 8px; }
.choices .btn.correct { border-color: var(--ok); color: var(--ok); background: #fff; }
.choices .btn.wrong { border-color: var(--ng); color: var(--ng); background: #fff; }

.feedback { text-align: center; font-size: 14px; line-height: 1.9; min-height: 3.8em; margin: 10px 0 0; }
.feedback .judge-ok { color: var(--ok); font-size: 17px; }
.feedback .judge-ng { color: var(--ng); font-size: 17px; }
.tap-next { text-align: center; color: var(--accent); font-size: 13px; }

/* 実例表示エリア（クイズのサンプル） */
.sample {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 2px dashed #ddd;
  padding: 14px;
  margin-bottom: 12px;
  position: relative;
  overflow: hidden;
}

/* ガイド線（見えない線の可視化） */
.guide-line {
  position: absolute;
  background: var(--ng);
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}
.guide-line.v { width: 2px; top: 0; bottom: 0; }
.guide-line.h { height: 2px; left: 0; right: 0; }
.guide-line.show { opacity: 1; }
.guide-line.ok { background: var(--accent); }

.site-footer { text-align: center; font-size: 11px; color: #bbb; margin-top: 14px; letter-spacing: 2px; }