.investigation-board-main {
  --board-bg: var(--bg-surface);
  --board-grid: rgba(120, 120, 120, 0.15);
  --node-character: #3b82f6;
  --node-clue: #ef4444;
  --node-location: #10b981;
  --node-item: #f59e0b;
  --text-white: #fff;
  --danger-color: #ef4444;

  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  padding: 0;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
  color: var(--text-base);
  width: 100%;
  max-width: 100%;
  min-width: 0;
  height: calc(100vh - 120px);
  min-height: 500px;
  overflow: hidden;
  box-sizing: border-box;
}

.control-panel {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 10;
  box-sizing: border-box;
  padding: 0.75rem;
}

.board-management-row {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 0.4rem;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  padding: 0.35rem;
  border-radius: 0.6rem;
  pointer-events: auto;
  width: auto;
  margin-bottom: 0;
}

.board-management-row select {
  appearance: none;
  -webkit-appearance: none;
  background-color: var(--bg-page);
  color: var(--text-base);
  border: 1px solid var(--border-color);
  padding: 0.3rem 1.6rem 0.3rem 0.6rem;
  border-radius: 0.4rem;
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.4rem center;
  background-size: 0.8rem;
  cursor: pointer;
  height: 28px;
  font-size: 0.75rem;
  width: 110px;
}

.board-management-row select,
.board-management-row button {
  min-width: 0;
  box-sizing: border-box;
}

.board-management-row .btn {
  height: 28px;
  padding: 0.2rem 0.5rem;
  font-size: 0.75rem;
  border-radius: 0.4rem;
  white-space: nowrap;
}

.search-filter-row {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.4rem;
  width: auto;
}

.search-box {
  width: 140px;
  pointer-events: auto;
}

.search-input {
  width: 100%;
  padding: 0.3rem 0.6rem;
  height: 28px;
  font-size: 0.75rem;
  border-radius: 0.4rem;
  border: 1px solid var(--border-color);
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(12px);
  color: var(--text-base);
  transition: border-color 0.2s ease;
  box-sizing: border-box;
}

.search-input:focus {
  outline: none;
  border-color: var(--accent);
}

.filter-group {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 0.25rem;
  justify-content: flex-end;
  width: auto;
  max-width: 180px;
  pointer-events: auto;
}

.btn {
  padding: 0.6rem 1rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border-color);
  background: var(--bg-page);
  color: var(--text-base);
  cursor: pointer;
  font-weight: 600;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
}

.btn:hover {
  background: var(--bg-surface);
  border-color: var(--accent);
  transform: translateY(-1px);
}

.btn-filter {
  padding: 0.2rem 0.4rem;
  font-size: 0.65rem;
  height: 24px;
  border-radius: 0.3rem;
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
}

.btn-filter.active {
  background: var(--accent);
  color: var(--text-white);
  border-color: var(--accent);
}

.action-buttons-row {
  position: absolute;
  bottom: 0.75rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 0.4rem;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  padding: 0.35rem;
  border-radius: 0.6rem;
  pointer-events: auto;
  width: auto;
}

.action-buttons-row button {
  min-width: 0;
  box-sizing: border-box;
}

.action-buttons-row .btn {
  height: 32px;
  padding: 0.3rem 0.6rem;
  font-size: 0.75rem;
  border-radius: 0.4rem;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: var(--text-white);
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent);
  opacity: 0.9;
}

.btn-secondary {
  background: var(--bg-page);
  color: var(--text-base);
}

.btn-danger {
  background: #dc2626;
  color: var(--text-white);
  border-color: #dc2626;
}

.btn-danger:hover {
  background: #b91c1c;
}

.board-canvas-wrapper {
  width: 100%;
  height: 100%;
  border: none;
  border-radius: 1rem;
  background: var(--bg-page);
  position: relative;
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}

.board-viewport {
  width: 100%;
  height: 100%;
  overflow: auto;
  position: relative;
  scroll-behavior: smooth;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.board-viewport::-webkit-scrollbar {
  display: none;
}

.board-area {
  position: relative;
  background-image: radial-gradient(var(--board-grid) 1.5px, transparent 1.5px);
  background-size: 30px 30px;
  cursor: grab;
  transition: width 0.2s ease, height 0.2s ease;
}

.board-area.grabbing {
  cursor: grabbing;
}

.board-svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

.connection-path {
  fill: none;
  stroke-width: 3px;
  transition: stroke-width 0.2s ease, opacity 0.2s ease;
}

.connection-path.highlighted {
  stroke-width: 5px;
}

.connection-text {
  font-size: 0.8rem;
  font-weight: 700;
  paint-order: stroke;
  stroke: var(--bg-page);
  stroke-width: 5px;
  stroke-linecap: round;
  stroke-linejoin: round;
  dominant-baseline: middle;
  text-anchor: middle;
}

.board-nodes {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 2;
}

.board-node {
  position: absolute;
  width: 240px;
  padding: 1rem;
  border-radius: 0.75rem;
  background: var(--bg-surface);
  border: 2px solid var(--border-color);
  color: var(--text-base);
  pointer-events: auto;
  user-select: none;
  cursor: grab;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
  transition: opacity 0.2s ease, transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275), border-color 0.2s ease;
}

.board-node:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.board-node.dragging {
  cursor: grabbing;
  transform: scale(1.05);
  z-index: 99;
}

.board-node-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.50rem;
}

.node-category-badge {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.15rem 0.5rem;
  border-radius: 99px;
  color: var(--text-white);
}

.category-character {
  background: var(--node-character);
}

.category-clue {
  background: var(--node-clue);
}

.category-location {
  background: var(--node-location);
}

.category-item {
  background: var(--node-item);
}

.category-custom {
  background: var(--accent);
}

.node-actions {
  display: flex;
  gap: 0.5rem;
}

.node-action-link {
  color: var(--text-base);
  background: var(--bg-page);
  border: 1px solid var(--border-color);
  cursor: pointer;
  border-radius: 4px;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 0;
}

.node-action-link:hover {
  background: var(--accent);
  color: var(--text-white);
  border-color: var(--accent);
}

.board-node-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-base);
  overflow-wrap: break-word;
  margin-bottom: 0.25rem;
}

.board-node-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.board-node-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
}

.board-node-tag {
  font-size: 0.65rem;
  background: var(--bg-page);
  border: 1px solid var(--border-color);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  color: var(--text-muted);
}

.card-drawer-overlay,
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
}

.card-drawer-overlay.active,
.modal-overlay.active {
  display: flex;
}

.card-drawer {
  position: absolute;
  right: 0;
  top: 0;
  height: 100%;
  width: 100%;
  background: var(--bg-surface);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  overflow-y: auto;
  color: var(--text-base);
  animation: slide-in 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slide-in {
  from {
    transform: translateX(100%);
  }
  to {
    transform: translateX(0);
  }
}

.drawer-header,
.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.drawer-heading,
.modal-heading {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-base);
}

.btn-close-drawer,
.btn-close-modal {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
}

.drawer-form,
.modal-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-base);
}

.form-control {
  padding: 0.6rem 0.75rem;
  border-radius: 0.4rem;
  border: 1px solid var(--border-color);
  background: var(--bg-page);
  color: var(--text-base);
}

.form-control:focus {
  outline: none;
  border-color: var(--accent);
}

.color-picker {
  padding: 0.2rem;
  height: 40px;
  cursor: pointer;
}

.drawer-actions,
.modal-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
}

.modal-dialog {
  width: 100%;
  height: 100%;
  background: var(--bg-surface);
  padding: 1.5rem;
  color: var(--text-base);
  animation: scale-up 0.2s ease;
  display: flex;
  flex-direction: column;
}

@keyframes scale-up {
  from {
    transform: scale(0.95);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

.dimmed {
  opacity: 0.25;
}

.highlight-source {
  transform: scale(1.03);
  box-shadow: 0 0 25px rgba(244, 63, 94, 0.2);
}

.connection-banner {
  display: none;
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: var(--text-white);
  padding: 0.6rem 1.2rem;
  border-radius: 99px;
  font-size: 0.85rem;
  font-weight: 700;
  z-index: 10;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
  width: 90%;
  text-align: center;
}

.connection-banner.active {
  display: block;
}

.board-node-notes {
  margin: 0.5rem 0;
  padding-left: 1.2rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  list-style-type: disc;
  pointer-events: none;
}

.board-node-notes li {
  margin-bottom: 0.2rem;
  line-height: 1.3;
}

.notes-input-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.note-input-row {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.btn-sm {
  padding: 0.35rem 0.7rem;
  font-size: 0.75rem;
  border-radius: 0.3rem;
  align-self: flex-start;
}

.zoom-controls {
  position: absolute;
  bottom: 1rem;
  right: 1rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 0.4rem;
  border-radius: 99px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  z-index: 100;
}

.zoom-btn {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background: var(--bg-page);
  color: var(--text-base);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
}

.zoom-btn:hover {
  background: var(--accent);
  color: var(--text-white);
  border-color: var(--accent);
}

.zoom-value {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-base);
  min-width: 2.5rem;
  text-align: center;
  user-select: none;
}

@media (min-width: 769px) {
  .investigation-board-main {
    height: 650px;
  }

  .card-drawer {
    max-width: 450px;
    border-left: 1px solid var(--border-color);
  }

  .modal-dialog {
    max-width: 450px;
    height: auto;
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
  }

  .connection-banner {
    width: auto;
  }
}

.investigation-board-main.immersive {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 9999;
  border-radius: 0;
  border: none;
  margin: 0;
  padding: 0;
  background: var(--bg-surface);
}

.investigation-board-main.immersive .control-panel {
  display: none;
}

.investigation-board-main.immersive .board-canvas-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
  border: none;
  border-radius: 0;
}

.investigation-board-main.immersive .board-viewport {
  flex: 1;
  height: auto;
}

.context-menu {
  position: fixed;
  display: none;
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
  padding: 0.35rem;
  z-index: 10000;
  min-width: 130px;
  flex-direction: column;
  gap: 0.15rem;
}

.context-menu.active {
  display: flex;
}

.context-menu-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.4rem 0.6rem;
  background: none;
  border: none;
  color: var(--text-base);
  font-size: 0.75rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  border-radius: 0.3rem;
  transition: background 0.15s ease;
}

.context-menu-item:hover {
  background: rgba(255, 255, 255, 0.08);
}

.context-menu-item svg {
  color: var(--text-muted);
}

.context-menu-item:hover svg {
  color: var(--text-base);
}

.context-menu-item.danger {
  color: var(--danger-color);
}

.context-menu-item.danger svg {
  color: var(--danger-color);
}

.context-menu-item.danger:hover {
  background: rgba(239, 68, 68, 0.15);
}

@media (max-width: 768px) {
  .zoom-controls {
    bottom: 4.5rem;
    right: 0.75rem;
  }
}