:root {
  --bg:         #0f1923;
  --bg-card:    #1a2634;
  --accent:     #ff4655;
  --accent-dim: #c73040;
  --correct:    #00c89c;
  --text:       #ece8e1;
  --text-muted: #7a8a99;
  --border:     #ffffff12;
  --transition: 0.18s ease;
}

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

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: 'Noto Sans JP', sans-serif;
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;
  user-select: none;
}

.screen {
  display: none;
  position: fixed;
  inset: 0;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.screen.active { display: flex; }

/* ── スタート・結果画面 ── */
.inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 40px 24px;
  text-align: center;
  max-width: 400px;
  width: 100%;
}
.inner .btn-home { align-self: flex-start; }

.label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.15em;
}

h1 { font-size: 1.8rem; font-weight: 700; letter-spacing: 0.04em; }
h2 { font-size: 1.4rem; font-weight: 700; }

.desc {
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.7;
}

.btn-primary {
  margin-top: 8px;
  padding: 14px 48px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  transition: background var(--transition), transform var(--transition);
  letter-spacing: 0.06em;
}
.btn-primary:hover  { background: var(--accent-dim); }
.btn-primary:active { transform: scale(0.96); }

.btn-home {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 5px 10px;
  border: 1.5px solid #ffffff20;
  border-radius: 6px;
  transition: color var(--transition), border-color var(--transition);
}
.btn-home:hover { color: var(--text); border-color: #ffffff50; }

/* ── ゲーム画面 ── */
#screen-game {
  transition: background 0.05s;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

#screen-game.s-ready  { background: var(--bg-card); }
#screen-game.s-wait   { background: #c0392b; }
#screen-game.s-react  { background: #00a87a; }
#screen-game.s-early  { background: #7b1a1a; }
#screen-game.s-show   { background: var(--bg-card); }

.game-round {
  position: absolute;
  top: 24px;
  right: 24px;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.4);
  font-weight: 600;
}

.game-center {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.game-main-text {
  font-size: 3rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.04em;
  line-height: 1.2;
  text-align: center;
}

.game-sub-text {
  font-size: 1rem;
  color: rgba(255,255,255,0.5);
  font-weight: 600;
}

/* ── 結果画面 ── */
.avg-wrap {
  display: flex;
  align-items: baseline;
  gap: 6px;
}
#result-avg {
  font-size: 4rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}
.avg-unit {
  font-size: 1.1rem;
  color: var(--text-muted);
}

.result-list {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 4px;
}
.result-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 16px;
  background: #ffffff08;
  border-radius: 8px;
  font-size: 0.9rem;
}
.result-item .r-label { color: var(--text-muted); }
.result-item .r-val   { font-weight: 700; }

.result-msg {
  font-size: 0.95rem;
  color: var(--text-muted);
  min-height: 1.5em;
}