:root {
  color-scheme: dark;
  --bg: #070a12;
  --panel: rgba(12, 16, 29, 0.84);
  --panel-solid: #101526;
  --panel-soft: rgba(22, 28, 47, 0.78);
  --line: rgba(255, 255, 255, 0.1);
  --line-strong: rgba(255, 255, 255, 0.2);
  --text: #f8f8fc;
  --muted: #9aa4bb;
  --muted-2: #667087;
  --pink: #ff6fae;
  --cyan: #72d9ff;
  --violet: #a98cff;
  --amber: #ffcb6b;
  --green: #65e2a7;
  --danger: #ff7b7b;
  --radius: 18px;
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.42);
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #edf1f7;
  --panel: rgba(255, 255, 255, 0.84);
  --panel-solid: #f7f9fc;
  --panel-soft: rgba(240, 243, 249, 0.86);
  --line: rgba(34, 40, 61, 0.12);
  --line-strong: rgba(34, 40, 61, 0.22);
  --text: #161a2b;
  --muted: #59637a;
  --muted-2: #7a849a;
  --shadow: 0 28px 72px rgba(47, 56, 79, 0.15);
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html,
body {
  min-width: 320px;
  min-height: 100%;
}

body {
  margin: 0;
  overflow-x: hidden;
  color: var(--text);
  background:
    radial-gradient(circle at 18% 0%, rgba(123, 81, 170, 0.22), transparent 30%),
    radial-gradient(circle at 90% 20%, rgba(40, 132, 169, 0.16), transparent 28%),
    var(--bg);
  font-family: Pretendard, "Apple SD Gothic Neo", "Noto Sans KR", Inter, system-ui, sans-serif;
}

button,
input {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
a:focus-visible,
input:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.cad-shell {
  width: min(1880px, 100%);
  margin: 0 auto;
  padding: 14px;
}

.cad-topbar {
  min-height: 68px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 22px;
  padding: 0 8px 14px;
}

.cad-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  text-decoration: none;
}

.cad-brand small,
.cad-brand strong {
  display: block;
}

.cad-brand small {
  margin-bottom: 2px;
  color: var(--muted);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.18em;
}

.cad-brand strong {
  font-size: 21px;
  letter-spacing: -0.035em;
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  align-items: end;
  gap: 4px;
  padding: 9px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: linear-gradient(145deg, rgba(255,255,255,0.09), rgba(255,255,255,0.02));
}

.brand-mark i {
  display: block;
  border-radius: 999px;
  background: linear-gradient(var(--pink), var(--violet));
}

.brand-mark i:nth-child(1) { height: 10px; }
.brand-mark i:nth-child(2) { height: 21px; }
.brand-mark i:nth-child(3) { height: 15px; }

.cad-modes {
  justify-self: center;
  display: flex;
  gap: 3px;
  width: min(420px, 100%);
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.025);
}
.cad-only-hidden { display: none !important; }

.cad-modes a,
.cad-modes span {
  flex: 1;
  min-height: 32px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  color: var(--muted);
  font-size: 11px;
  text-decoration: none;
}

.cad-modes span[aria-current="page"] {
  color: var(--text);
  background: linear-gradient(135deg, rgba(255, 111, 174, 0.22), rgba(169, 140, 255, 0.22));
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.08), 0 0 0 1px rgba(114,217,255,0.35);
}

.cad-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

.theme-toggle {
  min-height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 0 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.035);
  cursor: pointer;
  font-size: 10px;
}

.theme-toggle:hover {
  color: var(--text);
  border-color: var(--line-strong);
}

.theme-icon {
  width: 13px;
  color: var(--amber);
  font-size: 15px;
  line-height: 1;
}

.model-notice {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 34px;
  padding: 0 12px;
  border: 1px solid rgba(255, 203, 107, 0.24);
  border-radius: 999px;
  color: #e9d6ad;
  background: rgba(255, 203, 107, 0.07);
  font-size: 10px;
  white-space: nowrap;
}

.notice-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 10px rgba(255, 203, 107, 0.7);
}

.cad-workspace {
  min-height: calc(100vh - 112px);
  display: grid;
  grid-template-columns: 244px minmax(0, 1fr) 318px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: rgba(6, 9, 18, 0.72);
  box-shadow: var(--shadow), inset 0 1px rgba(255,255,255,0.05);
  backdrop-filter: blur(20px);
}

.assembly-panel,
.inspector-panel {
  min-width: 0;
  padding: 20px;
  background: rgba(8, 11, 21, 0.72);
}

.assembly-panel {
  border-right: 1px solid var(--line);
}

.inspector-panel {
  border-left: 1px solid var(--line);
}

.panel-heading {
  padding: 4px 5px 18px;
}

.panel-heading p,
.layer-section > p {
  margin: 0 0 5px;
  color: var(--muted-2);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.17em;
}

.panel-heading h1 {
  margin: 0;
  font-size: 24px;
  letter-spacing: -0.04em;
}

.assembly-tree {
  display: grid;
  gap: 5px;
}

.tree-branch {
  display: grid;
  gap: 3px;
}

.tree-item {
  width: 100%;
  min-height: 37px;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 0 10px;
  border: 1px solid transparent;
  border-radius: 9px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  text-align: left;
  font-size: 11px;
  transition: color 140ms ease, border-color 140ms ease, background 140ms ease;
}

.tree-item:hover {
  color: var(--text);
  background: rgba(255,255,255,0.04);
}

.tree-item.is-active,
.tree-item.is-selected {
  color: var(--text);
  border-color: rgba(114,217,255,0.18);
  background: linear-gradient(90deg, rgba(114,217,255,0.1), rgba(169,140,255,0.07));
}

.tree-root {
  font-weight: 600;
}

.tree-children {
  display: grid;
  gap: 2px;
  margin: 1px 0 5px 18px;
  padding-left: 10px;
  border-left: 1px solid var(--line);
}

.tree-children .tree-item {
  min-height: 31px;
  font-size: 10px;
}

.tree-cube {
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
  border: 1px solid currentColor;
  transform: rotate(30deg) skew(-6deg);
  opacity: 0.85;
}

.system-cube { color: var(--violet); }
.tablet-cube { color: var(--cyan); }
.piano-cube { color: var(--pink); }
.cloud-cube { color: var(--green); }

.layer-section {
  display: grid;
  gap: 9px;
  margin-top: 18px;
  padding: 17px 5px 2px;
  border-top: 1px solid var(--line);
}

.layer-section label {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 10px;
  cursor: pointer;
}

.layer-section input {
  width: 14px;
  height: 14px;
  margin: 0;
  accent-color: var(--pink);
}

.viewport-panel {
  position: relative;
  min-width: 0;
  min-height: 720px;
  overflow: hidden;
  isolation: isolate;
  background:
    radial-gradient(circle at 50% 42%, rgba(169,140,255,0.12), transparent 34%),
    linear-gradient(180deg, rgba(255,255,255,0.015), rgba(255,255,255,0));
}

#cadCanvas {
  width: 100%;
  height: 100%;
  display: block;
  cursor: grab;
  touch-action: none;
}

#cadCanvas:active {
  cursor: grabbing;
}

.cad-toolbar {
  position: absolute;
  z-index: 4;
  top: 16px;
  left: 16px;
  right: 16px;
  display: flex;
  justify-content: space-between;
  gap: 10px;
  pointer-events: none;
}

.toolbar-group {
  display: flex;
  gap: 3px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: rgba(10, 14, 26, 0.84);
  box-shadow: 0 14px 34px rgba(0,0,0,0.24);
  backdrop-filter: blur(12px);
  pointer-events: auto;
}

.toolbar-group button {
  min-height: 31px;
  padding: 0 10px;
  border: 0;
  border-radius: 8px;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  font-size: 10px;
}

.toolbar-group button:hover,
.toolbar-group button[aria-pressed="true"] {
  color: var(--text);
  background: rgba(255,255,255,0.08);
}

.toolbar-group button[aria-pressed="true"] {
  box-shadow: inset 0 0 0 1px rgba(114,217,255,0.18);
}

.label-layer {
  position: absolute;
  z-index: 3;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.cad-label {
  position: absolute;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 25px;
  padding: 0 8px;
  border: 1px solid var(--label-color, var(--line-strong));
  border-radius: 7px;
  color: var(--text);
  background: rgba(9, 13, 24, 0.88);
  box-shadow: 0 8px 22px rgba(0,0,0,0.28);
  font-size: 9px;
  font-family: inherit;
  white-space: nowrap;
  transform: translate(-50%, -50%);
  transition: opacity 120ms ease, background 120ms ease, box-shadow 120ms ease, transform 120ms ease;
  pointer-events: auto;
  cursor: pointer;
}

.cad-label:hover,
.cad-label:focus-visible,
.cad-label.is-selected {
  background: color-mix(in srgb, var(--label-color, var(--cyan)) 18%, rgba(9, 13, 24, 0.94));
  box-shadow: 0 8px 24px rgba(0,0,0,0.34), 0 0 0 1px var(--label-color, var(--cyan));
}

.cad-label:focus-visible {
  outline: 2px solid var(--label-color, var(--cyan));
  outline-offset: 3px;
}

.cad-label:active {
  transform: translate(-50%, -50%) scale(0.96);
}

.cad-label::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--label-color, var(--cyan));
  box-shadow: 0 0 8px var(--label-color, var(--cyan));
}

.axis-gizmo {
  position: absolute;
  z-index: 4;
  left: 18px;
  bottom: 19px;
  width: 66px;
  height: 66px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: rgba(8, 12, 22, 0.64);
  font-size: 8px;
  pointer-events: none;
}

.axis-gizmo::before,
.axis-gizmo::after {
  content: "";
  position: absolute;
  left: 32px;
  bottom: 31px;
  width: 25px;
  height: 1px;
  transform-origin: left center;
}

.axis-gizmo::before {
  background: var(--pink);
  transform: rotate(-18deg);
}

.axis-gizmo::after {
  background: var(--green);
  transform: rotate(-90deg);
}

.axis-gizmo span {
  position: absolute;
  font-weight: 700;
}

.axis-x { right: 4px; bottom: 19px; color: var(--pink); }
.axis-y { left: 29px; top: 3px; color: var(--green); }
.axis-z { left: 8px; bottom: 8px; color: var(--cyan); }

.viewport-hint {
  position: absolute;
  z-index: 4;
  left: 50%;
  bottom: 18px;
  padding: 7px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(8, 12, 22, 0.72);
  font-size: 9px;
  white-space: nowrap;
  transform: translateX(-50%);
  pointer-events: none;
}

.inspector-panel {
  overflow: auto;
}

.inspector-empty {
  min-height: 620px;
  display: grid;
  place-content: center;
  justify-items: center;
  text-align: center;
}

.selection-reticle {
  width: 72px;
  height: 72px;
  display: block;
  margin-bottom: 24px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  box-shadow: inset 0 0 0 13px transparent, inset 0 0 0 14px var(--line);
  position: relative;
}

.selection-reticle::before,
.selection-reticle::after {
  content: "";
  position: absolute;
  background: var(--pink);
  box-shadow: 0 0 10px var(--pink);
}

.selection-reticle::before { width: 8px; height: 1px; top: 35px; left: -4px; }
.selection-reticle::after { width: 1px; height: 8px; top: -4px; left: 35px; }

.inspector-empty h2,
.inspector-content h2 {
  margin: 0;
  font-size: 23px;
  letter-spacing: -0.04em;
}

.inspector-empty p {
  max-width: 240px;
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.7;
}

.inspector-content {
  padding: 5px 0 20px;
}

.inspector-path {
  margin: 0 0 18px;
  color: var(--muted-2);
  font-size: 9px;
  letter-spacing: 0.08em;
}

.inspector-title-row {
  display: flex;
  align-items: center;
  gap: 13px;
}

.inspector-icon {
  width: 52px;
  height: 52px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  background: linear-gradient(145deg, rgba(255,255,255,0.1), rgba(255,255,255,0.025));
  font-size: 24px;
}

.status-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 5px;
  color: var(--muted);
  font-size: 9px;
}

.status-chip::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--status-color, var(--pink));
  box-shadow: 0 0 9px var(--status-color, var(--pink));
}

#inspectorType {
  margin: 5px 0 0;
  color: var(--muted-2);
  font-size: 9px;
}

.inspector-summary {
  margin: 18px 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.65;
}

.inspector-meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  overflow: hidden;
  margin: 0 0 18px;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: var(--line);
}

.inspector-meta div {
  min-width: 0;
  padding: 11px;
  background: var(--panel-solid);
}

.inspector-meta dt,
.inspector-meta dd {
  margin: 0;
}

.inspector-meta dt {
  margin-bottom: 4px;
  color: var(--muted-2);
  font-size: 8px;
}

.inspector-meta dd {
  overflow: hidden;
  font-size: 10px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.inspector-content section {
  padding: 15px 0;
  border-top: 1px solid var(--line);
}

.inspector-content section h3 {
  margin: 0 0 9px;
  color: var(--muted-2);
  font-size: 9px;
  letter-spacing: 0.12em;
}

.inspector-content ul {
  display: grid;
  gap: 7px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.inspector-content li {
  position: relative;
  padding-left: 13px;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.55;
}

.inspector-content li::before {
  content: "";
  position: absolute;
  top: 7px;
  left: 0;
  width: 5px;
  height: 5px;
  border-radius: 1px;
  background: var(--cyan);
}

.warning-section li::before {
  background: var(--amber);
}

.interface-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.interface-chips span {
  padding: 5px 7px;
  border: 1px solid var(--line);
  border-radius: 7px;
  color: var(--muted);
  background: rgba(255,255,255,0.025);
  font-size: 9px;
}

.focus-button,
.document-button {
  width: 100%;
  min-height: 42px;
  margin-top: 5px;
  border: 1px solid rgba(114,217,255,0.25);
  border-radius: 10px;
  color: var(--text);
  background: linear-gradient(135deg, rgba(114,217,255,0.12), rgba(169,140,255,0.12));
  cursor: pointer;
  font-size: 10px;
}

.document-button {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 8px;
  border-color: rgba(255,111,174,0.25);
  background: linear-gradient(135deg, rgba(255,111,174,0.12), rgba(169,140,255,0.12));
  text-decoration: none;
}

.document-button:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.cad-footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 11px 8px 0;
  color: var(--muted-2);
  font-size: 9px;
  letter-spacing: 0.05em;
}

.loading-screen {
  position: fixed;
  z-index: 20;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  color: var(--muted);
  background: var(--bg);
  font-size: 11px;
  transition: opacity 250ms ease, visibility 250ms ease;
}

.loading-screen span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--pink);
  box-shadow: 0 0 18px var(--pink);
  animation: loading-pulse 1s ease-in-out infinite alternate;
}

.loading-screen.is-hidden {
  opacity: 0;
  visibility: hidden;
}

:root[data-theme="light"] body {
  background:
    radial-gradient(circle at 18% 0%, rgba(169, 140, 255, 0.2), transparent 31%),
    radial-gradient(circle at 90% 20%, rgba(114, 217, 255, 0.2), transparent 29%),
    var(--bg);
}

:root[data-theme="light"] .brand-mark,
:root[data-theme="light"] .inspector-icon {
  background: linear-gradient(145deg, rgba(255,255,255,0.92), rgba(229,233,242,0.78));
}

:root[data-theme="light"] .cad-modes,
:root[data-theme="light"] .theme-toggle {
  background: rgba(255, 255, 255, 0.58);
}

:root[data-theme="light"] .cad-modes span[aria-current="page"] {
  background: linear-gradient(135deg, rgba(255, 111, 174, 0.18), rgba(169, 140, 255, 0.2));
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.7), 0 0 0 1px rgba(91,139,177,0.24);
}

:root[data-theme="light"] .model-notice {
  color: #725a2e;
  background: rgba(255, 203, 107, 0.16);
}

:root[data-theme="light"] .cad-workspace {
  background: rgba(250, 252, 255, 0.76);
  box-shadow: var(--shadow), inset 0 1px rgba(255,255,255,0.8);
}

:root[data-theme="light"] .assembly-panel,
:root[data-theme="light"] .inspector-panel {
  background: rgba(248, 250, 254, 0.8);
}

:root[data-theme="light"] .tree-item:hover {
  background: rgba(35, 45, 70, 0.05);
}

:root[data-theme="light"] .tree-item.is-active,
:root[data-theme="light"] .tree-item.is-selected {
  background: linear-gradient(90deg, rgba(114,217,255,0.16), rgba(169,140,255,0.12));
}

:root[data-theme="light"] .viewport-panel {
  background:
    radial-gradient(circle at 50% 42%, rgba(169,140,255,0.13), transparent 34%),
    linear-gradient(180deg, rgba(255,255,255,0.22), rgba(255,255,255,0));
}

:root[data-theme="light"] .toolbar-group,
:root[data-theme="light"] .cad-label,
:root[data-theme="light"] .axis-gizmo,
:root[data-theme="light"] .viewport-hint {
  background: rgba(251, 252, 255, 0.88);
  box-shadow: 0 12px 30px rgba(48,58,82,0.13);
}

:root[data-theme="light"] .toolbar-group button:hover,
:root[data-theme="light"] .toolbar-group button[aria-pressed="true"] {
  background: rgba(34, 44, 68, 0.08);
}

:root[data-theme="light"] .interface-chips span {
  background: rgba(34, 44, 68, 0.035);
}

@keyframes loading-pulse {
  to { transform: scale(1.7); opacity: 0.45; }
}

@media (max-width: 1180px) {
  .cad-workspace {
    grid-template-columns: 210px minmax(0, 1fr);
  }

  .inspector-panel {
    grid-column: 1 / -1;
    min-height: 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .inspector-empty {
    min-height: 220px;
  }

  .inspector-content {
    display: grid;
    grid-template-columns: minmax(240px, 0.8fr) minmax(300px, 1.2fr);
    gap: 0 26px;
  }

  .inspector-content > section,
  .inspector-content > .focus-button,
  .inspector-content > .document-button {
    grid-column: 2;
  }

  .inspector-path,
  .inspector-title-row,
  .inspector-summary,
  .inspector-meta {
    grid-column: 1;
  }
}

@media (max-width: 820px) {
  .cad-topbar {
    grid-template-columns: 1fr auto;
  }

  .cad-modes {
    grid-column: 1 / -1;
    grid-row: 2;
    justify-self: stretch;
    width: 100%;
  }

  .cad-workspace {
    grid-template-columns: 1fr;
    overflow: visible;
  }

  .assembly-panel {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .assembly-tree {
    grid-template-columns: repeat(4, minmax(145px, 1fr));
    overflow-x: auto;
    padding-bottom: 7px;
  }

  .tree-children,
  .layer-section {
    display: none;
  }

  .viewport-panel {
    min-height: 620px;
  }

  .inspector-panel {
    grid-column: auto;
  }

  .inspector-content {
    grid-template-columns: 1fr;
  }

  .inspector-content > section,
  .inspector-content > .focus-button,
  .inspector-content > .document-button,
  .inspector-path,
  .inspector-title-row,
  .inspector-summary,
  .inspector-meta {
    grid-column: 1;
  }
}

@media (max-width: 560px) {
  .cad-shell {
    padding: 8px;
  }

  .cad-topbar {
    gap: 10px;
    padding-inline: 3px;
  }

  .cad-brand strong {
    font-size: 18px;
  }

  .model-notice {
    max-width: 145px;
    white-space: normal;
  }

  .theme-toggle {
    width: 34px;
    padding: 0;
  }

  .theme-label {
    display: none;
  }

  .cad-workspace {
    border-radius: 18px;
  }

  .assembly-panel,
  .inspector-panel {
    padding: 15px;
  }

  .viewport-panel {
    min-height: 560px;
  }

  .cad-toolbar {
    top: 10px;
    left: 10px;
    right: 10px;
    align-items: flex-start;
    flex-direction: column;
  }

  .toolbar-group {
    max-width: 100%;
    overflow-x: auto;
  }

  .viewport-hint {
    max-width: calc(100% - 96px);
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .cad-footer {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}