/*
 * cipher.css
 * LITTLE CIPHER の館内共通スタイル。ダーク基調+鍵と真鍮を思わせる金色アクセント。
 * 数値表示が主役のため等幅フォントを軸に据える。
 */

:root {
  --bg: #0b0c10;
  --panel-bg: #17181d;
  --panel-border: #2c2a22;
  --text: #e9e6dc;
  --text-dim: #9b9788;
  --brass: #c9a227;
  --brass-bright: #e8c04a;
  --ok: #7ee787;
  --bad: #ff6b6b;
  --mono: "SF Mono", "Menlo", "Consolas", "Noto Sans Mono CJK JP", monospace;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Hiragino Sans", "Yu Gothic", "Noto Sans JP", sans-serif;
  line-height: 1.7;
  overflow-x: hidden;
}

a {
  color: var(--brass-bright);
}

input, select, textarea {
  font-size: 16px;
}

.lc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  background: var(--panel-bg);
  border-bottom: 1px solid var(--panel-border);
  position: sticky;
  top: 0;
  z-index: 10;
  flex-wrap: wrap;
}

.lc-header h1 {
  font-size: 1.05rem;
  margin: 0;
  flex: 1 1 auto;
  min-width: 0;
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
}

.lc-header a {
  text-decoration: none;
  font-size: 0.9rem;
  white-space: nowrap;
  padding: 6px 10px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  border-radius: 6px;
  border: 1px solid var(--panel-border);
}

.lc-header a:hover {
  background: var(--panel-border);
}

main {
  max-width: 880px;
  margin: 0 auto;
  padding: 16px 16px 64px;
}

.lc-panel {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  padding: 16px;
  margin: 16px 0;
}

.lc-panel h2 {
  margin-top: 0;
  color: var(--brass-bright);
  font-size: 1.1rem;
}

.lc-panel h3 {
  color: var(--text);
  font-size: 1rem;
  border-left: 3px solid var(--brass);
  padding-left: 8px;
}

.lc-note {
  color: var(--text-dim);
  font-size: 0.9rem;
}

.lc-warn {
  color: var(--bad);
  font-size: 0.9rem;
  border-left: 3px solid var(--bad);
  padding-left: 8px;
}

details.lc-math {
  margin: 10px 0;
  background: #101116;
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 6px 12px;
}

details.lc-math summary {
  cursor: pointer;
  color: var(--text-dim);
  font-size: 0.9rem;
}

/* ---- 大きな数の表示(renderBigNum) ---- */

.lc-bignum {
  display: block;
  font-family: var(--mono);
}

.lc-bignum-badge {
  display: inline-block;
  font-size: 0.75rem;
  color: var(--bg);
  background: var(--brass);
  padding: 2px 8px;
  border-radius: 10px;
  margin-bottom: 6px;
}

.lc-bignum-grid {
  display: block;
  word-break: break-all;
  font-size: 1.05rem;
  line-height: 1.9;
}

.lc-bignum-group {
  display: inline-block;
  margin-right: 0.35em;
}

.lc-bignum-group-animate {
  animation: lc-fade-in 260ms ease-out backwards;
}

@keyframes lc-fade-in {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---- ビット格子(renderBitGrid) ---- */

.lc-bitgrid {
  display: inline-flex;
  flex-direction: column;
  gap: 2px;
  font-family: var(--mono);
  font-size: 0.75rem;
}

.lc-bitgrid-row {
  display: flex;
  gap: 2px;
}

.lc-bitgrid-cell {
  width: 1.4em;
  height: 1.4em;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 3px;
  background: #23242b;
  color: var(--text-dim);
}

.lc-bit-1 {
  color: var(--text);
}

.lc-bit-diff {
  background: var(--brass);
  color: var(--bg);
  font-weight: bold;
}

/* ---- AES stateグリッド(renderStateGrid) ---- */

.lc-stategrid {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  font-family: var(--mono);
}

.lc-stategrid-row {
  display: flex;
  gap: 4px;
}

.lc-stategrid-cell {
  min-width: 2.6em;
  padding: 6px 4px;
  text-align: center;
  background: #23242b;
  border: 1px solid var(--panel-border);
  border-radius: 4px;
  font-size: 0.95rem;
}

/* ---- TracePlayer操作パネル ---- */

.lc-player-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 10px;
}

.lc-player-controls button {
  min-width: 44px;
  min-height: 44px;
  border-radius: 6px;
  border: 1px solid var(--panel-border);
  background: #23242b;
  color: var(--text);
  font-size: 1rem;
  cursor: pointer;
}

.lc-player-controls button:hover {
  border-color: var(--brass);
}

.lc-player-seek {
  flex: 1 1 160px;
  min-width: 120px;
  min-height: 44px;
}

.lc-player-speed {
  color: var(--text-dim);
  font-family: var(--mono);
  min-width: 3.5em;
  text-align: center;
}

/* ---- エントランスの展示室扉 ---- */

#exhibit-doors {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}

.lc-door {
  display: block;
  padding: 14px;
  border-radius: 8px;
  border: 1px solid var(--panel-border);
  text-decoration: none;
  color: var(--text);
}

.lc-door strong {
  display: block;
  margin-bottom: 4px;
}

.lc-door-open {
  background: #1d1a10;
  border-color: var(--brass);
}

.lc-door-open:hover {
  border-color: var(--brass-bright);
}

.lc-door-closed {
  opacity: 0.55;
}

/* ---- レスポンシブ ---- */

@media (max-width: 480px) {
  .lc-bignum-grid {
    font-size: 0.9rem;
  }
  .lc-bitgrid-cell {
    width: 1.15em;
    height: 1.15em;
    font-size: 0.65rem;
  }
}

/* little-bit: focus-visible(2026-08-29追加)
   キーボード操作でいまどこにいるかが見えないアプリが24中20あった
   (サイト品質棚卸し B-5)。:where() で詳細度0にしてあるので、
   個別に focus スタイルを持つ要素はそちらが勝つ。
   色はサイト共通のアクセント(#e8825a)。明るい地でも暗い地でも見える。 */
:where(a, button, input, select, textarea, summary, [tabindex]):focus-visible {
  outline: 2px solid #e8825a;
  outline-offset: 2px;
}