/* ============================================================
   壁打ちくん — 差分表示
   ============================================================ */

.btn-diff {
  background: rgba(245, 158, 11, 0.14);
  border: 1px solid rgba(245, 158, 11, 0.4);
  color: #fbbf24;
  padding: 7px 13px;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-family: var(--font-main);
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}
.btn-diff:hover:not(:disabled) { background: rgba(245, 158, 11, 0.26); }
.btn-diff:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-diff.is-active {
  background: rgba(245, 158, 11, 0.32);
  border-color: #f59e0b;
  color: #fff;
}

/* --- 差分表示の外枠 --- */
.kbd-root {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
}

.kbd-bar {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 9px 16px;
  background: var(--bg-sidebar);
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
  flex-wrap: wrap;
}

.kbd-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
}

.kbd-legend {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.kbd-key {
  font-size: 0.7rem;
  padding: 2px 9px;
  border-radius: 999px;
  border: 1px solid transparent;
  white-space: nowrap;
}
.kbd-key-add { background: rgba(16, 185, 129, 0.18); color: #34d399; border-color: rgba(16, 185, 129, 0.4); }
.kbd-key-del { background: rgba(239, 68, 68, 0.16);  color: #f87171; border-color: rgba(239, 68, 68, 0.4); }
.kbd-key-mod { background: rgba(245, 158, 11, 0.18); color: #fbbf24; border-color: rgba(245, 158, 11, 0.4); }

.kbd-close {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-family: var(--font-main);
  cursor: pointer;
  white-space: nowrap;
}
.kbd-close:hover { background: rgba(255, 255, 255, 0.16); }

.kbd-body {
  flex: 1;
  overflow: auto;
  padding: 20px;
  background: #0b1120;
}

.kbd-empty {
  padding: 40px 20px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.9;
}

.kbd-note {
  margin-bottom: 14px;
  padding: 9px 13px;
  border-radius: var(--radius-sm);
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: #fbbf24;
  font-size: 0.76rem;
  line-height: 1.7;
}

/* ============================================================
   文書モードの差分（白い紙の上に表示）
   ============================================================ */
.kbd-doc {
  background: #ffffff;
  color: #1e293b;
  border-radius: var(--radius-md);
  padding: 28px 32px;
  max-width: 900px;
  margin: 0 auto;
  box-shadow: var(--shadow-md);
  font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 15px;
  line-height: 1.9;
}

.kbd-b {
  position: relative;
  padding: 3px 10px 3px 30px;
  margin: 2px 0;
  border-radius: 4px;
  border-left: 3px solid transparent;
}

.kbd-mark {
  position: absolute;
  left: 8px;
  top: 3px;
  font-size: 0.8em;
  font-weight: 700;
  opacity: 0.75;
}

.kbd-content img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  margin: 6px 0;
  display: block;
}

/* 追加された行 */
.kbd-b.kbd-add {
  background: #dcfce7;
  border-left-color: #16a34a;
  color: #14532d;
}
.kbd-b.kbd-add .kbd-mark { color: #16a34a; }

/* 削除された行 */
.kbd-b.kbd-del {
  background: #fee2e2;
  border-left-color: #dc2626;
  color: #7f1d1d;
  text-decoration: line-through;
  text-decoration-color: rgba(220, 38, 38, 0.5);
}
.kbd-b.kbd-del .kbd-mark { color: #dc2626; text-decoration: none; }

/* 変更された行 */
.kbd-b.kbd-mod {
  background: #fef3c7;
  border-left-color: #d97706;
  color: #713f12;
}
.kbd-b.kbd-mod .kbd-mark { color: #d97706; }

/* 変更行の中の語単位マーク */
.kbd-del-t {
  background: rgba(220, 38, 38, 0.18);
  color: #991b1b;
  text-decoration: line-through;
  border-radius: 3px;
  padding: 0 2px;
}
.kbd-add-t {
  background: rgba(22, 163, 74, 0.2);
  color: #14532d;
  text-decoration: none;
  font-weight: 600;
  border-radius: 3px;
  padding: 0 2px;
}

/* 見出しはそのままの大きさで */
.kbd-doc h1.kbd-b { font-size: 1.7em; }
.kbd-doc h2.kbd-b { font-size: 1.45em; }
.kbd-doc h3.kbd-b { font-size: 1.25em; }
.kbd-doc h4.kbd-b,
.kbd-doc h5.kbd-b,
.kbd-doc h6.kbd-b { font-size: 1.1em; }

.kbd-b.kbd-li .kbd-content::before {
  content: '・';
  margin-right: 2px;
}

/* ============================================================
   キャンバスモードの差分
   ============================================================ */
.kbd-canvas {
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* 縮小後の実寸を持つ外枠。ステージはこの中で絶対配置にする。
   （transform はレイアウトに影響しないため、外枠に寸法を持たせないと
     スクロール量や中央寄せがずれる） */
.kbd-canvas-inner {
  position: relative;
  flex-shrink: 0;
}

.kbd-stage {
  position: absolute;
  top: 0;
  left: 0;
  background: #ffffff;
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  transform-origin: top left;
}

/* 変更が無い要素は少し控えめに */
.kbd-stage .kbd-c-same { opacity: 0.55; }

.kbd-stage .kbc-item {
  pointer-events: none;
}

.kbd-stage .kbd-c-add {
  outline: 3px solid #16a34a;
  outline-offset: 2px;
}
.kbd-stage .kbd-c-mod {
  outline: 3px solid #d97706;
  outline-offset: 2px;
}
.kbd-stage .kbd-c-del {
  outline: 3px dashed #dc2626;
  outline-offset: 2px;
  opacity: 0.35;
  filter: grayscale(0.6);
}

/* 要素に付ける「追加」「移動」などの札 */
.kbd-c-tag {
  position: absolute;
  top: -11px;
  left: -3px;
  font-size: 10px;
  font-weight: 700;
  line-height: 1;
  padding: 3px 7px;
  border-radius: 4px;
  color: #fff;
  white-space: nowrap;
  z-index: 5;
  font-family: 'Noto Sans JP', sans-serif;
}
.kbd-c-add .kbd-c-tag { background: #16a34a; }
.kbd-c-mod .kbd-c-tag { background: #d97706; }
.kbd-c-del .kbd-c-tag { background: #dc2626; }

@media (max-width: 900px) {
  .kbd-doc { padding: 20px 16px; }
  .kbd-legend { margin-left: 0; }
}