:root {
  --bg: #f6f8ff;
  --surface: #ffffff;
  --surface-alt: #eef2ff;
  --ink: #1a2350;
  --ink-soft: rgba(26, 35, 80, 0.7);
  --accent: #6350ff;
  --accent-alt: #3bcf9f;
  --border: rgba(99, 80, 255, 0.16);
  font-family: 'IBM Plex Sans', system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  display: grid;
  min-height: 100vh;
  grid-template-rows: auto 1fr auto;
}

button,
select,
input {
  font-family: inherit;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: linear-gradient(135deg, rgba(99, 80, 255, 0.08), rgba(59, 207, 159, 0.12));
  border-bottom: 1px solid var(--border);
  box-shadow: 0 12px 24px rgba(26, 35, 80, 0.08);
}

.app-logo {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.app-actions {
  display: flex;
  gap: 12px;
}

.app-actions button {
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid transparent;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.app-actions button.secondary,
.secondary {
  background: var(--surface);
  color: var(--accent);
  border-color: var(--accent);
}

.app-main {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 0;
  min-height: calc(100vh - 120px);
}

.sidebar {
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 24px 20px;
  display: grid;
  gap: 24px;
  height: calc(100vh - 120px);
  position: sticky;
  top: 120px;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.sidebar::-webkit-scrollbar {
  width: 8px;
}

.sidebar::-webkit-scrollbar-thumb {
  background: rgba(99, 80, 255, 0.24);
  border-radius: 999px;
}

.panel {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  display: grid;
  gap: 12px;
}

.panel h2 {
  margin: 0;
  font-size: 1rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.panel-help {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.quickstart {
  display: grid;
  gap: 8px;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.quickstart ol {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 6px;
}

.template-list {
  display: grid;
  gap: 12px;
}

.template-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
  display: grid;
  gap: 10px;
  cursor: pointer;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.template-card:hover,
.template-card:focus {
  border-color: var(--accent);
  box-shadow: 0 10px 20px rgba(99, 80, 255, 0.16);
  outline: none;
}

.template-card strong {
  font-size: 0.95rem;
}

.template-thumb {
  width: 100%;
  height: 120px;
  border-radius: 10px;
  border: 1px solid rgba(99, 80, 255, 0.18);
  background: rgba(99, 80, 255, 0.04);
}

.template-metrics {
  font-size: 0.8rem;
  color: var(--ink-soft);
  letter-spacing: 0.02em;
}

.template-card.start-empty {
  border-style: dashed;
  border-color: rgba(99, 80, 255, 0.4);
  background: rgba(99, 80, 255, 0.06);
}

.furniture-list {
  display: grid;
  gap: 12px;
}

.furniture-card {
  background: #fff;
  border: 1px solid rgba(59, 207, 159, 0.35);
  border-radius: 12px;
  padding: 12px;
  display: grid;
  gap: 6px;
  cursor: pointer;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.furniture-card:hover,
.furniture-card:focus {
  border-color: var(--accent-alt);
  box-shadow: 0 10px 20px rgba(59, 207, 159, 0.18);
  outline: none;
}

.furniture-card strong {
  font-size: 0.95rem;
}

.furniture-card span {
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.component-list {
  display: grid;
  gap: 12px;
}

.component-card {
  background: #fff;
  border: 1px solid rgba(247, 127, 0, 0.35);
  border-radius: 12px;
  padding: 12px;
  display: grid;
  gap: 6px;
  cursor: pointer;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.component-card:hover,
.component-card:focus {
  border-color: var(--accent-amber);
  box-shadow: 0 10px 20px rgba(247, 127, 0, 0.22);
  outline: none;
}

.component-card strong {
  font-size: 0.95rem;
}

.component-card span {
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.component-card__meta {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.component-filters {
  display: grid;
  gap: 8px;
}

.component-filters input,
.component-filters select {
  padding: 8px 10px;
  border: 1px solid rgba(99, 80, 255, 0.25);
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.9rem;
  background: #fff;
}

.component-empty {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin: 8px 0 0;
}

.properties-panel {
  background: rgba(99, 80, 255, 0.08);
  border: 1px solid rgba(99, 80, 255, 0.22);
  border-radius: 12px;
  padding: 14px;
  display: grid;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--ink-soft);
}

.properties-grid {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 6px 12px;
  margin: 0;
  padding: 0;
}

.properties-grid dt {
  margin: 0;
  font-weight: 600;
  color: var(--ink);
}

.properties-grid dd {
  margin: 0;
  color: var(--ink-soft);
}

.wall-controls {
  display: grid;
  gap: 10px;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid rgba(99, 80, 255, 0.2);
}

.property-note {
  font-size: 0.8rem;
  color: var(--ink-soft);
  margin: 6px 0 0;
}

.control-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--ink);
}

.control-row input {
  width: 120px;
  padding: 4px 6px;
  border: 1px solid rgba(99, 80, 255, 0.3);
  border-radius: 6px;
  font-family: inherit;
}

.control-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

.control-actions button {
  padding: 6px 10px;
  font-size: 0.8rem;
}

.properties-actions {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  width: 100%;
}

.properties-actions button {
  font-size: 0.85rem;
  padding: 8px 12px;
}

.properties-actions button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.tool-group {
  display: grid;
  gap: 8px;
}

.tool-controls {
  display: grid;
  gap: 10px;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.inline {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.canvas-wrapper {
  position: sticky;
  top: 120px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 24px;
  background: var(--surface);
  border-left: 1px solid var(--border);
  height: calc(100vh - 120px);
  overflow: visible;
}

.canvas-toolbar {
  width: 100%;
  max-width: 1200px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px 24px;
  padding: 12px 20px;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(99, 80, 255, 0.12);
  border-radius: 14px;
  font-size: 0.9rem;
  box-shadow: 0 12px 24px rgba(26, 35, 80, 0.08);
}

.canvas-toolbar span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.canvas-toolbar span::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.canvas-toolbar span:first-child::before {
  background: var(--accent-alt);
}

.canvas-toolbar span:nth-child(2)::before {
  background: var(--accent);
}

.canvas-toolbar span:nth-child(3)::before {
  background: var(--accent-amber);
}

.canvas-toolbar span:nth-child(4)::before {
  background: var(--ink-soft);
}

.canvas-stage {
  position: relative;
  width: 100%;
  max-width: 1200px;
}

.selection-hud {
  position: absolute;
  top: 24px;
  right: 24px;
  width: min(280px, 32%);
  display: grid;
  gap: 14px;
  padding: 18px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid rgba(99, 80, 255, 0.18);
  box-shadow: 0 18px 34px rgba(26, 35, 80, 0.16);
  backdrop-filter: blur(12px);
  z-index: 2;
}

.selection-hud h2 {
  margin: 0;
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.selection-hud__toolbar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.selection-hud__toolbar button {
  flex: 1 1 120px;
  font-size: 0.8rem;
  padding: 6px 10px;
}

.selection-hud__toolbar button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.selection-hud__actions {
  justify-content: space-between;
}

.selection-hud__actions button {
  flex: 1;
}

.is-hidden {
  display: none !important;
}

#plan-canvas {
  width: 100%;
  max-width: 1200px;
  aspect-ratio: 16 / 9;
  height: auto;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 18px 40px rgba(26, 35, 80, 0.12);
  cursor: crosshair;
}

.canvas-context-menu {
  position: fixed;
  z-index: 3000;
  min-width: 220px;
  padding: 8px 0;
  border: 1px solid rgba(99, 80, 255, 0.18);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 18px 36px rgba(26, 35, 80, 0.18);
  display: grid;
  gap: 0;
}

.canvas-context-menu[hidden] {
  display: none;
}

.canvas-context-menu:focus {
  outline: 2px solid rgba(99, 80, 255, 0.35);
  outline-offset: 2px;
}

.context-menu__title {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 6px 16px 8px;
  color: var(--ink-soft);
}

.context-menu__divider {
  height: 1px;
  margin: 4px 0;
  background: rgba(99, 80, 255, 0.16);
}

.context-menu__item {
  appearance: none;
  border: none;
  background: none;
  text-align: left;
  padding: 9px 16px;
  font-size: 0.92rem;
  color: var(--ink);
  font-family: inherit;
  cursor: pointer;
}

.context-menu__item:hover,
.context-menu__item:focus {
  background: rgba(99, 80, 255, 0.08);
  color: var(--accent);
  outline: none;
}

.app-footer {
  padding: 14px 24px;
  font-size: 0.85rem;
  color: var(--ink-soft);
  background: var(--surface);
  border-top: 1px solid var(--border);
}

.mission-log {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 4px;
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.mission-log li {
  padding: 4px 0;
}

@media (max-width: 1200px) {
  .app-main {
    grid-template-columns: 1fr;
  }
  .sidebar {
    position: relative;
    top: 0;
    height: auto;
  }
  .canvas-wrapper {
    position: relative;
    top: 0;
    height: auto;
  }
  .selection-hud {
    right: 16px;
    top: 16px;
    width: 260px;
  }
}

@media (max-width: 960px) {
  .canvas-stage {
    display: grid;
    gap: 16px;
  }
  .selection-hud {
    position: static;
    width: 100%;
    margin-top: 0;
    box-shadow: 0 12px 28px rgba(26, 35, 80, 0.12);
  }
  .selection-hud__actions {
    flex-wrap: wrap;
  }
  .selection-hud__actions button {
    flex: 1 1 100%;
  }
}

@media (max-width: 720px) {
  .app-header {
    flex-direction: column;
    gap: 12px;
  }
  .app-actions {
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
  }
}