:root {
  --bg: #0a0c10;
  --panel: #11151c;
  --line: #1e2530;
  --fg: #e6edf3;
  --dim: #8b98a8;
  --dimmer: #7b8794; /* panel 上で 5.0:1（0.7rem 前後の注記に使う）*/
  --left: #7dd3fc;
  --right: #64748b;
  --accent: #fbbf24;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, "Roboto Mono", monospace;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: ui-sans-serif, system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", sans-serif;
  line-height: 1.75;
  font-feature-settings: "palt";
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 3rem 1.25rem 5rem;
}

/* ── ヒーロー ───────────────────────────────── */

.hero { text-align: center; margin-bottom: 2.5rem; }

h1 {
  font-size: clamp(1.6rem, 5vw, 2.3rem);
  letter-spacing: 0.06em;
  margin: 0 0 1.25rem;
  font-weight: 600;
}

.lede { font-size: clamp(0.98rem, 2.6vw, 1.12rem); margin: 0 0 0.75rem; }
.lede b { color: var(--left); font-weight: 600; }

.sub { color: var(--dim); font-size: 0.88rem; margin: 0; }
.sub b { color: var(--fg); font-weight: 600; }
.sub sup { font-size: 0.7em; }

/* ── 箱 ────────────────────────────────────── */

.box-section { margin-bottom: 3rem; }

.box-wrap {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  background: #070910;
}

#box { display: block; width: 100%; height: auto; }

.box-flash {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: var(--left);
  opacity: 0;
}
.box-flash.on { animation: flash 620ms ease-out; }
@keyframes flash {
  0%   { opacity: 0.16; }
  100% { opacity: 0; }
}

.readout {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1rem;
  margin-top: 1.1rem;
}

.side { display: flex; align-items: baseline; gap: 0.5rem; }
.side.right { justify-content: flex-end; }
.side-label { color: var(--dim); font-size: 0.8rem; }
.side-value {
  font-family: var(--mono);
  font-size: 1.9rem;
  font-variant-numeric: tabular-nums;
  color: var(--left);
  transition: color 200ms;
}
.side.right .side-value { color: var(--right); }

.countdown { text-align: center; }
.cd-label { display: block; color: var(--dimmer); font-size: 0.68rem; letter-spacing: 0.08em; }
.cd-value {
  font-family: var(--mono);
  font-size: 1rem;
  color: var(--dim);
  font-variant-numeric: tabular-nums;
}

.plain {
  text-align: center;
  color: var(--dim);
  font-size: 0.95rem;
  line-height: 1.7;
  margin: 1rem 0 0;
  text-wrap: balance;
}
.plain b { color: var(--fg); font-weight: 600; }

/* ゴールまでの距離 */
.distance { margin: 1.2rem auto 0; max-width: 520px; padding: 0 2.6rem 2.6rem; }
.distance-track { position: relative; height: 6px; border-radius: 999px; background: var(--line); }
.distance-fill { position: absolute; left: 0; top: 0; bottom: 0; width: 0; border-radius: 999px; background: var(--left); opacity: 0.55; transition: width 0.6s ease; }
.distance-mark { position: absolute; top: 50%; width: 2px; height: 14px; margin-left: -1px; transform: translateY(-50%); background: var(--dim); }
.distance-mark b { position: absolute; top: 16px; left: 50%; transform: translateX(-50%); white-space: nowrap; font-weight: 400; font-size: 0.68rem; color: var(--dimmer); letter-spacing: 0.04em; font-family: var(--mono); }
.distance-mark.now { background: var(--left); height: 18px; width: 3px; margin-left: -1.5px; }
.distance-mark.now b { color: var(--left); font-weight: 600; top: auto; bottom: 16px; }
/* ラベルの衝突回避: 今・ゴールは上段、平均は下段 1 行目、最高は下段 2 行目。ゴールだけ右寄せ */
.distance-mark.best { background: var(--accent); }
.distance-mark.best b { color: var(--accent); top: 32px; } /* 平均と同じ段に置くと 50〜80 で重なるので 2 段目 */
.distance-mark.goal { background: var(--fg); }
.distance-mark.goal b { color: var(--fg); transform: translateX(-100%); left: 2px; top: auto; bottom: 16px; }
.distance-mark.avg b { transform: translateX(-50%); }
.how { text-align: center; color: var(--dim); font-size: 0.82rem; line-height: 1.7; margin: 0.6rem 0 0; text-wrap: balance; }

.note {
  text-align: center;
  color: var(--dimmer);
  font-size: 0.76rem;
  font-family: var(--mono);
  margin: 0.85rem 0 0;
}

/* ── パネル ─────────────────────────────────── */

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1.4rem 1.3rem;
  margin-bottom: 1.1rem;
}

.panel h2 {
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  color: var(--dim);
  font-weight: 600;
  margin: 0 0 1.1rem;
}
.panel h2 small { color: var(--dimmer); font-weight: 400; letter-spacing: 0; }

#spark { display: block; width: 100%; height: auto; margin-bottom: 1.2rem; }

.kv { margin: 0; display: grid; gap: 0.55rem; }
.kv > div { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; }
.kv dt { color: var(--dim); font-size: 0.84rem; margin: 0; }
.kv dd {
  margin: 0;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  text-align: right;
  font-size: 0.92rem;
}
.kv.big dd { font-size: 1.05rem; }
.kv dd .unit { color: var(--dimmer); font-size: 0.78em; margin-left: 0.3em; }
.kv dd .when { display: block; color: var(--dimmer); font-size: 0.72rem; }

.footnote {
  color: var(--dimmer);
  font-size: 0.75rem;
  line-height: 1.7;
  margin: 1.1rem 0 0;
}
.footnote.dim { color: var(--dimmer); }
.footnote a { color: var(--dim); }
.footnote code {
  font-family: var(--mono);
  font-size: 0.92em;
  background: #0a0d13;
  padding: 0.1em 0.4em;
  border-radius: 3px;
}

/* ── 確率の壁 ───────────────────────────────── */

.walls { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.3rem; }
.walls li {
  display: grid;
  grid-template-columns: 1.4rem 1fr auto;
  align-items: baseline;
  gap: 0.6rem;
  font-size: 0.82rem;
  padding: 0.3rem 0;
  border-bottom: 1px solid #161b23;
}
.walls li:last-child { border-bottom: 0; }
.walls .mark { font-size: 0.9rem; color: var(--dimmer); }
.walls li.cleared .mark { color: var(--accent); }
.walls li.cleared .odds { color: var(--fg); }
.walls .odds { font-family: var(--mono); color: var(--dimmer); font-variant-numeric: tabular-nums; }
.walls .need { font-family: var(--mono); color: var(--dimmer); font-size: 0.78rem; white-space: nowrap; }
.walls li.cleared .need { color: var(--dim); }
.walls li.goal .odds { color: var(--left); }

/* ── タイムマシン ───────────────────────────── */

.tm { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; }

.tm input {
  background: #0a0d13;
  border: 1px solid var(--line);
  color: var(--fg);
  border-radius: 6px;
  padding: 0.5rem 0.7rem;
  font-family: var(--mono);
  font-size: 0.84rem;
  color-scheme: dark;
}

button {
  background: #1c2530;
  border: 1px solid #2a3644;
  color: var(--fg);
  border-radius: 6px;
  padding: 0.5rem 0.95rem;
  font-size: 0.82rem;
  cursor: pointer;
  font-family: inherit;
}
button:hover { background: #24303e; }
button.ghost { background: transparent; color: var(--dim); }
button.ghost:hover { background: #161b23; }

/* ── フッター ───────────────────────────────── */

footer { margin-top: 2.5rem; text-align: center; }

.xpost {
  display: inline-block;
  border: 1px solid #2a3644;
  border-radius: 999px;
  padding: 0.6rem 1.8rem;
  color: var(--fg);
  text-decoration: none;
  font-size: 0.85rem;
  margin-bottom: 1.2rem;
}
.xpost:hover { background: #161b23; }

footer .footnote { text-align: left; }
footer .copyright { margin-top: 1.2rem; font-size: 0.75rem; color: var(--dimmer); }

/* ── レスポンシブ ───────────────────────────── */

@media (max-width: 480px) {
  main { padding: 2rem 0.9rem 3.5rem; }
  .panel { padding: 1.1rem 1rem; }
  .side-value { font-size: 1.5rem; }
  .kv > div { flex-direction: column; align-items: flex-start; gap: 0.1rem; }
  .kv dd { text-align: left; }
  .walls li { grid-template-columns: 1.2rem 1fr; }
  .walls .need { grid-column: 2; }
}

@media (prefers-reduced-motion: reduce) {
  .box-flash.on { animation: none; }
}
/* キーボード操作のフォーカス表示（共通）。outline-none を指定した部品はそれぞれの focus スタイルが勝つ */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }