/* ════════════════════════════════════════════════════════════════
   yeon-thinkmap — 스타일
   다크 톤(기본). 라이트 톤은 .ytm-root.ytm-light 로 토글.
   ════════════════════════════════════════════════════════════════ */

.ytm-root {
  --ytm-bg-deep: #0c1a1f;
  --ytm-bg-mid: #122428;
  --ytm-line-faint: rgba(255,255,255,.06);
  --ytm-line-soft: rgba(255,255,255,.12);
  --ytm-ink-primary: #f0ede2;
  --ytm-ink-soft: rgba(240,237,226,.72);
  --ytm-ink-mute: rgba(240,237,226,.45);
  --ytm-ink-faint: rgba(240,237,226,.28);
  --ytm-amber: #c4923e;
  --ytm-teal: #3aa0a8;
  --ytm-font-serif: "Noto Serif KR", serif;
  --ytm-font-sans: "Pretendard", "Apple SD Gothic Neo", sans-serif;

  position: relative;
  width: 100%; height: 100%;
  min-height: 480px;
  background: radial-gradient(ellipse at center, var(--ytm-bg-mid) 0%, var(--ytm-bg-deep) 80%);
  color: var(--ytm-ink-primary);
  font-family: var(--ytm-font-sans);
  font-size: 14px;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}
.ytm-root * { box-sizing: border-box; }

.ytm-root.ytm-light {
  --ytm-bg-deep: #eee9dc;
  --ytm-bg-mid: #f4f0e6;
  --ytm-line-faint: rgba(26,35,38,.06);
  --ytm-line-soft: rgba(26,35,38,.14);
  --ytm-ink-primary: #1a2326;
  --ytm-ink-soft: rgba(26,35,38,.72);
  --ytm-ink-mute: rgba(26,35,38,.5);
  --ytm-ink-faint: rgba(26,35,38,.3);
}

/* ── 헤더 ────────────────────────────────────────────────── */
.ytm-header {
  position: absolute; top: 0; left: 0; right: 0; z-index: 10;
  display: flex; align-items: center; gap: 14px;
  padding: 12px 20px;
  background: linear-gradient(to bottom, rgba(12,26,31,.92), rgba(12,26,31,.65));
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--ytm-line-faint);
  flex-wrap: wrap;
}
.ytm-light .ytm-header {
  background: linear-gradient(to bottom, rgba(244,240,230,.94), rgba(244,240,230,.7));
}

.ytm-brand-block { flex-shrink: 0; }
.ytm-page-title {
  font-family: var(--ytm-font-serif);
  font-size: 17px; font-weight: 700;
  color: var(--ytm-ink-primary);
  line-height: 1.2;
}
.ytm-page-sub {
  font-size: 12px; color: var(--ytm-ink-mute);
  margin-top: 2px;
}

/* 검색 */
.ytm-search { flex: 1; max-width: 320px; position: relative; }
.ytm-search-input {
  width: 100%;
  padding: 7px 12px 7px 32px;
  background: rgba(255,255,255,.04);
  border: 1px solid var(--ytm-line-soft);
  border-radius: 999px;
  color: var(--ytm-ink-primary);
  font-family: inherit; font-size: 13px;
  transition: all .2s ease;
}
.ytm-light .ytm-search-input { background: rgba(255,255,255,.6); }
.ytm-search-input::placeholder { color: var(--ytm-ink-faint); }
.ytm-search-input:focus {
  outline: none; border-color: var(--ytm-teal);
  background: rgba(58,160,168,.06);
}
.ytm-search-ico {
  position: absolute; left: 11px; top: 50%; transform: translateY(-50%);
  color: var(--ytm-ink-mute); font-size: 13px;
}

/* 필터 */
.ytm-filters { display: flex; gap: 4px; flex-wrap: wrap; }
.ytm-filter {
  appearance: none; border: 1px solid var(--ytm-line-soft);
  background: rgba(255,255,255,.02);
  color: var(--ytm-ink-soft);
  padding: 6px 13px; border-radius: 999px;
  font-family: inherit; font-size: 12.5px; font-weight: 500;
  cursor: pointer;
  transition: all .18s ease;
  white-space: nowrap;
}
.ytm-filter:hover { background: rgba(255,255,255,.06); color: var(--ytm-ink-primary); }
.ytm-filter.active {
  background: var(--ytm-teal); border-color: var(--ytm-teal);
  color: #0a1518; font-weight: 600;
}

/* 통계 */
.ytm-stats { display: flex; gap: 6px; }
.ytm-stat {
  display: flex; align-items: baseline; gap: 4px;
  padding: 4px 10px;
  border: 1px solid var(--ytm-line-soft);
  border-radius: 999px;
  font-size: 11.5px; color: var(--ytm-ink-soft);
}
.ytm-stat-num {
  font-family: var(--ytm-font-serif);
  font-size: 13px; font-weight: 700;
  color: var(--ytm-ink-primary);
}

/* 백업 */
.ytm-backup { position: relative; }
.ytm-backup-btn {
  appearance: none; border: 1px solid var(--ytm-line-soft);
  background: rgba(255,255,255,.02);
  color: var(--ytm-ink-soft);
  width: 32px; height: 32px;
  border-radius: 50%;
  font-size: 16px; cursor: pointer;
  transition: all .15s ease;
}
.ytm-backup-btn:hover {
  background: rgba(196,146,62,.18);
  color: var(--ytm-amber);
  border-color: var(--ytm-amber);
}
.ytm-backup-menu {
  position: absolute; right: 0; top: 40px;
  min-width: 240px;
  background: rgba(18,36,40,.96);
  border: 1px solid var(--ytm-line-soft);
  border-radius: 10px;
  padding: 6px;
  z-index: 30;
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 12px 32px rgba(0,0,0,.4);
}
.ytm-light .ytm-backup-menu { background: rgba(251,250,245,.98); }
.ytm-backup-menu button {
  display: block; width: 100%; text-align: left;
  appearance: none; border: 0; background: transparent;
  color: var(--ytm-ink-primary);
  padding: 8px 12px; border-radius: 6px;
  font-family: inherit; font-size: 13px;
  cursor: pointer;
}
.ytm-backup-menu button:hover { background: rgba(255,255,255,.06); }
.ytm-backup-menu hr {
  border: 0; border-top: 1px solid var(--ytm-line-faint);
  margin: 4px 0;
}
.ytm-backup-hint {
  display: block;
  padding: 6px 12px 4px;
  font-family: var(--ytm-font-serif);
  font-size: 11px;
  color: var(--ytm-ink-faint);
  line-height: 1.5;
}

/* ── 캔버스 무대 ─────────────────────────────────────────── */
.ytm-stage { position: absolute; inset: 0; }
.ytm-canvas {
  display: block; width: 100%; height: 100%;
  cursor: grab;
  touch-action: none;
}
.ytm-canvas.over-node { cursor: pointer; }
.ytm-canvas.panning { cursor: grabbing; }

/* ── 빈 상태 ─────────────────────────────────────────────── */
.ytm-empty-hint {
  position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
  text-align: center; color: var(--ytm-ink-mute);
  pointer-events: none;
}
.ytm-empty-icon {
  font-family: var(--ytm-font-serif);
  font-size: 56px; color: var(--ytm-ink-faint);
  margin-bottom: 14px;
}
.ytm-empty-text {
  font-family: var(--ytm-font-serif);
  font-size: 16px;
}

/* ── 좌하단 범례 ─────────────────────────────────────────── */
.ytm-legend {
  position: absolute; left: 20px; bottom: 56px; z-index: 5;
  width: 200px;
  background: rgba(18,36,40,.88);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--ytm-line-soft);
  border-radius: 10px;
  padding: 14px 16px;
  box-shadow: 0 8px 32px rgba(0,0,0,.4);
}
.ytm-light .ytm-legend { background: rgba(255,255,255,.85); }
.ytm-legend-title {
  font-family: var(--ytm-font-serif);
  font-size: 13px; font-weight: 700;
  color: var(--ytm-ink-primary);
  margin-bottom: 10px;
}
.ytm-legend-row {
  display: flex; align-items: center; gap: 10px;
  padding: 5px 0;
  cursor: pointer;
  transition: opacity .18s ease;
}
.ytm-legend-row:hover { opacity: .75; }
.ytm-legend-dot {
  width: 10px; height: 10px; border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 8px currentColor;
}
.ytm-legend-label { flex: 1; font-size: 13px; color: var(--ytm-ink-primary); }
.ytm-legend-count {
  font-family: ui-monospace, monospace;
  font-size: 12px; color: var(--ytm-ink-mute);
  font-variant-numeric: tabular-nums;
}

/* ── 우하단 줌 ───────────────────────────────────────────── */
.ytm-zoom {
  position: absolute; left: 16px; right: auto; bottom: 56px; z-index: 6;
  display: flex; flex-direction: column;
  background: rgba(18,36,40,.88);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--ytm-line-soft);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0,0,0,.4);
  user-select: none;
}
.ytm-light .ytm-zoom { background: rgba(255,255,255,.85); }
.ytm-zoom-btn {
  appearance: none; border: 0; background: transparent;
  color: var(--ytm-ink-primary);
  width: 40px; height: 36px;
  font-size: 17px; font-weight: 600;
  cursor: pointer;
  border-bottom: 1px solid var(--ytm-line-faint);
  line-height: 1;
}
.ytm-zoom-btn:last-child { border-bottom: 0; }
.ytm-zoom-btn:hover { background: rgba(255,255,255,.08); }
.ytm-zoom-level {
  font-family: ui-monospace, monospace;
  font-size: 10px; color: var(--ytm-ink-mute);
  text-align: center;
  padding: 5px 0;
  border-bottom: 1px solid var(--ytm-line-faint);
  background: rgba(0,0,0,.2);
  font-variant-numeric: tabular-nums;
}
.ytm-zoom-hint {
  position: absolute; right: 64px; bottom: 64px; z-index: 5;
  font-size: 11px;
  color: var(--ytm-ink-faint);
  background: rgba(18,36,40,.75);
  padding: 6px 10px;
  border-radius: 6px;
  pointer-events: none;
  opacity: 0;
  transition: opacity .25s ease;
  white-space: nowrap;
}
.ytm-zoom-hint.show { opacity: 1; }

/* ── 우측 상세 패널 — 반투명 유리. 지도가 뒤로 은은히 비침 ── */
.ytm-detail {
  position: absolute; right: 0; top: 0; bottom: 0; z-index: 8;
  width: 360px;
  background: rgba(12,26,31,.42);
  backdrop-filter: blur(28px) saturate(140%);
  -webkit-backdrop-filter: blur(28px) saturate(140%);
  border-left: 1px solid rgba(255,255,255,.08);
  padding: 76px 28px 32px;
  transform: translateX(100%);
  transition: transform .32s cubic-bezier(.22,.68,0,1.1);
  overflow-y: auto;
  box-shadow: -8px 0 32px rgba(0,0,0,.15);
}
.ytm-light .ytm-detail {
  background: rgba(244,240,230,.55);
  border-left-color: rgba(26,35,38,.08);
}
.ytm-detail.open { transform: translateX(0); }

/* 전체 기록 보기 — 같은 반투명 유리, 조금 더 넓음 */
.ytm-deep-detail {
  position: absolute; right: 0; top: 0; bottom: 0; z-index: 9;
  width: 480px;
  background: rgba(12,26,31,.48);
  backdrop-filter: blur(32px) saturate(150%);
  -webkit-backdrop-filter: blur(32px) saturate(150%);
  border-left: 1px solid rgba(255,255,255,.1);
  padding: 76px 32px 32px;
  transform: translateX(100%);
  transition: transform .34s cubic-bezier(.22,.68,0,1.1);
  overflow-y: auto;
  box-shadow: -12px 0 40px rgba(0,0,0,.2);
}
.ytm-light .ytm-deep-detail { background: rgba(244,240,230,.6); }
.ytm-deep-detail.open { transform: translateX(0); }
.ytm-deep-back {
  position: absolute; top: 70px; left: 22px;
  width: 30px; height: 30px;
  border: 1px solid var(--ytm-line-soft);
  background: rgba(0,0,0,.15);
  color: var(--ytm-ink-soft);
  border-radius: 50%; cursor: pointer;
  font-size: 14px; line-height: 1;
  display: flex; align-items: center; justify-content: center;
  z-index: 2;
}
.ytm-deep-back:hover { background: rgba(255,255,255,.08); color: var(--ytm-ink-primary); }

.ytm-deep-close {
  position: absolute; top: 70px; right: 22px;
  width: 32px; height: 32px;
  border: 1px solid var(--ytm-line-soft);
  background: rgba(0,0,0,.15);
  color: var(--ytm-ink-soft);
  border-radius: 50%; cursor: pointer;
  font-size: 18px; line-height: 1;
  display: flex; align-items: center; justify-content: center;
  z-index: 2;
  transition: all .15s ease;
}
.ytm-deep-close:hover {
  background: rgba(192,80,64,.2);
  color: #ff8a7a;
  border-color: rgba(192,80,64,.4);
}
.ytm-deep-cat {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 11px; font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: .04em;
  margin-left: 44px;
}
.ytm-deep-title {
  font-family: var(--ytm-font-serif);
  font-size: 26px; font-weight: 700;
  line-height: 1.35;
  margin-bottom: 6px;
}
.ytm-deep-meta {
  color: var(--ytm-ink-mute);
  font-size: 12px;
  margin-bottom: 20px;
}
.ytm-deep-section {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid rgba(255,255,255,.06);
}
.ytm-deep-section:first-of-type {
  border-top: 0;
  margin-top: 0;
  padding-top: 0;
}
.ytm-deep-section-label {
  font-family: var(--ytm-font-serif);
  font-size: 11px; font-weight: 600;
  color: var(--ytm-ink-mute);
  letter-spacing: .08em;
  text-transform: uppercase;
  margin-bottom: 10px;
}
.ytm-deep-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}
.ytm-deep-stat {
  background: rgba(255,255,255,.04);
  border: 0.5px solid rgba(255,255,255,.08);
  border-radius: 8px;
  padding: 10px 12px;
}
.ytm-deep-stat-label {
  font-size: 11px;
  color: var(--ytm-ink-mute);
  margin-bottom: 4px;
}
.ytm-deep-stat-num {
  font-family: var(--ytm-font-serif);
  font-size: 18px; font-weight: 600;
  color: var(--ytm-ink-primary);
}
.ytm-deep-body-text {
  color: var(--ytm-ink-soft);
  line-height: 1.7;
  font-size: 14px;
  white-space: pre-wrap;
}
.ytm-deep-empty {
  color: var(--ytm-ink-faint);
  font-size: 12px;
  font-style: italic;
}
.ytm-deep-conn-group {
  margin-bottom: 12px;
}
.ytm-deep-conn-group-label {
  font-size: 11px;
  color: var(--ytm-ink-mute);
  margin-bottom: 6px;
  letter-spacing: .04em;
}
.ytm-deep-conn-item {
  padding: 7px 0;
  border-bottom: 1px solid rgba(255,255,255,.05);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
}
.ytm-deep-conn-item:hover { color: var(--ytm-teal); }
.ytm-deep-conn-dot {
  width: 7px; height: 7px; border-radius: 50%;
  flex-shrink: 0;
}
.ytm-detail-close {
  position: absolute; top: 70px; right: 20px;
  width: 28px; height: 28px;
  border: 1px solid var(--ytm-line-soft);
  background: transparent; color: var(--ytm-ink-soft);
  border-radius: 50%; cursor: pointer;
  font-size: 16px; line-height: 1;
}
.ytm-detail-cat {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 11px; font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: .04em;
}
.ytm-detail-title {
  font-family: var(--ytm-font-serif);
  font-size: 22px; font-weight: 700;
  line-height: 1.4;
  margin-bottom: 8px;
}
.ytm-detail-meta {
  color: var(--ytm-ink-mute);
  font-size: 12px;
  margin-bottom: 16px;
}
.ytm-dot { color: var(--ytm-ink-faint); margin: 0 4px; }

.ytm-detail-mastery {
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--ytm-line-faint);
}
.ytm-mastery-label {
  font-family: var(--ytm-font-serif);
  font-size: 11px; font-weight: 600;
  color: var(--ytm-ink-mute);
  letter-spacing: .05em;
  margin-bottom: 6px;
}
.ytm-mastery-bar {
  height: 6px;
  background: rgba(255,255,255,.08);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 4px;
}
.ytm-mastery-fill {
  height: 100%;
  background: var(--ytm-teal);
  border-radius: 999px;
  transition: width .4s ease;
}
.ytm-mastery-num {
  font-family: var(--ytm-font-serif);
  font-size: 12px; font-weight: 600;
  color: var(--ytm-ink-soft);
  text-align: right;
}

.ytm-detail-body {
  color: var(--ytm-ink-soft);
  line-height: 1.7;
  font-size: 14px;
  margin-bottom: 18px;
  white-space: pre-wrap;
}
.ytm-detail-related { margin-top: 12px; }
.ytm-detail-related-label {
  font-family: var(--ytm-font-serif);
  font-size: 12px; font-weight: 600;
  color: var(--ytm-ink-mute);
  margin-bottom: 8px;
  letter-spacing: .05em;
}
.ytm-related-item {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 0;
  border-bottom: 1px solid var(--ytm-line-faint);
  transition: color .18s ease;
}
.ytm-related-dot {
  width: 8px; height: 8px; border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 6px currentColor;
}
.ytm-related-item-content {
  flex: 1; min-width: 0;
  cursor: pointer;
}
.ytm-related-item-content:hover .ytm-related-item-title { color: var(--ytm-teal); }
.ytm-related-item-title { font-size: 13px; line-height: 1.4; color: var(--ytm-ink-primary); }
.ytm-related-item-cat { font-size: 11px; color: var(--ytm-ink-mute); margin-top: 2px; }
.ytm-related-item-detail {
  flex-shrink: 0;
  appearance: none;
  width: 26px; height: 26px;
  border-radius: 50%;
  border: 0.5px solid rgba(255,255,255,.12);
  background: rgba(255,255,255,.03);
  color: var(--ytm-ink-mute);
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
  font-family: inherit;
  transition: all .15s ease;
  display: flex; align-items: center; justify-content: center;
}
.ytm-related-item-detail:hover {
  background: rgba(58,160,168,.16);
  border-color: var(--ytm-teal);
  color: var(--ytm-teal);
  transform: translateX(2px);
}
.ytm-light .ytm-related-item-detail {
  background: rgba(0,0,0,.03);
  border-color: rgba(26,35,38,.12);
}
.ytm-no-related { color: var(--ytm-ink-faint); font-size: 12px; }

/* ── 하단 모토 ───────────────────────────────────────────── */
.ytm-footer {
  position: absolute; bottom: 0; left: 0; right: 0; z-index: 5;
  text-align: center;
  padding: 12px;
  font-family: var(--ytm-font-serif);
  font-size: 13px;
  color: var(--ytm-ink-faint);
  pointer-events: none;
  background: linear-gradient(to top, var(--ytm-bg-deep), transparent);
}

/* ── 반응형 ──────────────────────────────────────────────── */
@media (max-width: 980px) {
  .ytm-header { padding: 10px 14px; gap: 8px; }
  .ytm-search { max-width: 100%; order: 10; width: 100%; }
  .ytm-filters { order: 11; }
  .ytm-stats { order: 12; }
  .ytm-backup { order: 13; }
  .ytm-legend { left: 10px; bottom: 50px; width: 160px; padding: 11px 13px; }
  .ytm-zoom { left: 10px; right: auto; bottom: 50px; }
  .ytm-detail { width: 100%; }
}