* { margin: 0; padding: 0; box-sizing: border-box; }
/* hidden 属性を確実に効かせる（.affiliate 等が display を上書きするため） */
[hidden] { display: none !important; }

:root {
  --bg: #0e0e12;
  --card: #17171e;
  --text: #f2f2f5;
  --sub: #9a9aa5;
  --accent: #ffd400;
  --bar: #3a3a46;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px;
}

.site-header { text-align: center; padding: 24px 0 16px; }
.site-header h1 { font-size: 1.7rem; letter-spacing: 0.12em; }
.tagline { color: var(--sub); font-size: 0.85rem; margin-top: 6px; }

.card {
  background: var(--card);
  border-radius: 16px;
  padding: 24px 20px;
  width: 100%;
  max-width: 480px;
  margin-bottom: 16px;
}

.q-date { color: var(--sub); font-size: 0.8rem; margin-bottom: 8px; }
.q-text { font-size: 1.25rem; line-height: 1.5; margin-bottom: 20px; }

.guess-value { display: flex; align-items: baseline; gap: 8px; justify-content: center; }
#guess-input {
  background: transparent; border: none; border-bottom: 3px solid var(--accent);
  color: var(--text); font-size: 2.4rem; font-weight: 700; width: 60%;
  text-align: center; outline: none;
}
#guess-input::-webkit-outer-spin-button, #guess-input::-webkit-inner-spin-button { -webkit-appearance: none; }
.unit { color: var(--sub); font-size: 1.1rem; }

#guess-slider { width: 100%; margin: 24px 0; accent-color: var(--accent); }

.cta {
  display: block; width: 100%; padding: 14px;
  background: var(--accent); color: #111; font-size: 1.05rem; font-weight: 700;
  border: none; border-radius: 10px; cursor: pointer;
}
.cta:active { transform: scale(0.98); }

.answer-label { color: var(--sub); font-size: 0.8rem; }
.answer-value { font-size: 2.6rem; font-weight: 800; color: var(--accent); }
.answer-source { color: var(--sub); font-size: 0.75rem; margin: 6px 0 14px; }
.answer-source a { color: var(--sub); }

.affiliate {
  display: inline-block; margin-bottom: 14px; color: var(--accent);
  font-weight: 700; text-decoration: none; border: 1px solid var(--accent);
  border-radius: 8px; padding: 8px 14px; font-size: 0.9rem;
}

.zure-box { text-align: center; margin: 18px 0; }
.zure-value { font-size: 1.5rem; font-weight: 700; }
.title-badge { font-size: 1.15rem; margin-top: 8px; }

.dist-box h3 { font-size: 0.9rem; color: var(--sub); margin-bottom: 10px; }
.histogram { display: flex; align-items: flex-end; gap: 2px; height: 110px; }
.histogram .bar { flex: 1; background: var(--bar); border-radius: 2px 2px 0 0; min-height: 2px; }
.histogram .bar.me { background: var(--accent); }
.dist-caption { color: var(--sub); font-size: 0.85rem; margin-top: 10px; }
.dist-caption strong { color: var(--accent); }

.streak { text-align: center; margin: 16px 0 12px; font-size: 1rem; }
.copied { color: var(--accent); text-align: center; margin-top: 10px; font-size: 0.85rem; }
.empty { color: var(--sub); text-align: center; padding: 24px 0; }

.site-footer { margin-top: auto; padding: 16px; }
.site-footer a { color: var(--sub); font-size: 0.75rem; }