:root {
  font-family: ui-monospace, 'SF Mono', Menlo, Monaco, monospace;
  color-scheme: dark;
  --bg: #050507;
  --fg: #e5e5e5;
  --muted: #888;
  --dim: #555;
  --border: #1f1f26;
  --accent: #4ade80;
  --danger: #f87171;
  --blue: #60a5fa;
  --panel: #0a0a10;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }

body {
  background: radial-gradient(ellipse at top, #0a0a14 0%, var(--bg) 70%);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  padding: max(1.25rem, env(safe-area-inset-top)) max(1.25rem, env(safe-area-inset-right))
    max(1.25rem, env(safe-area-inset-bottom)) max(1.25rem, env(safe-area-inset-left));
  gap: 1rem;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: .75rem;
  flex-wrap: wrap;
}

.brand h1 {
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, #fff, #888);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.brand h1::before {
  content: '> ';
  color: var(--accent);
  -webkit-text-fill-color: var(--accent);
}
.home-link { text-decoration: none; display: inline-block; transition: opacity .15s; }
.home-link:hover { opacity: .75; }
.tagline { color: var(--muted); font-size: .85rem; margin-top: .2rem; }

.actions { display: flex; gap: .4rem; flex-wrap: wrap; align-items: center; }

button {
  font-family: inherit;
  font-size: .8rem;
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 5px;
  padding: .45rem .85rem;
  cursor: pointer;
  transition: background .15s;
}
button:hover { background: rgba(74, 222, 128, .08); }

.btn-danger { color: var(--danger); border-color: var(--danger); }
.btn-danger:hover { background: rgba(248, 113, 113, .08); }

/* 3-column layout: sidebar | editor | viewport */
.layout {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(220px, 260px) minmax(280px, 1fr) minmax(320px, 1.3fr);
  gap: 1rem;
  min-height: 0;
}

.side-pane, .editor-pane, .viewport-pane {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

/* sidebar */
.section-label {
  font-size: .68rem;
  color: var(--dim);
  text-transform: uppercase;
  letter-spacing: .08em;
  padding: .55rem .75rem .25rem;
}

.shape-library { border-bottom: 1px solid var(--border); padding-bottom: .5rem; flex-shrink: 0; }
.shape-btns { display: flex; gap: .3rem; padding: 0 .75rem; flex-wrap: wrap; }
.shape-btn {
  font-size: .72rem;
  padding: .28rem .55rem;
  border-color: var(--border);
  color: var(--muted);
}
.shape-btn:hover { color: var(--accent); border-color: var(--accent); background: rgba(74,222,128,.07); }

.draw-label { padding-top: .15rem; }
.sketch-btn {
  font-family: inherit;
  font-size: .72rem;
  background: transparent;
  color: var(--blue);
  border: 1px solid var(--blue);
  border-radius: 5px;
  padding: .28rem .7rem;
  cursor: pointer;
  transition: background .15s;
}
.sketch-btn:hover { background: rgba(96,165,250,.1); }
.sketch-btn.active { background: rgba(96,165,250,.18); color: #dbeafe; border-color: #dbeafe; }

.object-list-wrap {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  border-bottom: 1px solid var(--border);
}
#object-list { padding: .25rem .5rem; }

.empty-hint { color: var(--dim); font-size: .76rem; padding: .5rem .35rem; }

.obj-item {
  display: flex;
  align-items: center;
  gap: .5rem;
  padding: .38rem .5rem;
  border-radius: 5px;
  cursor: pointer;
  font-size: .82rem;
  transition: background .1s;
}
.obj-item:hover { background: rgba(255,255,255,.04); }
.obj-item.selected { background: rgba(74,222,128,.08); }

.obj-op { width: 1rem; text-align: center; font-weight: 700; font-size: .9rem; }
.op-add       { color: var(--accent); }
.op-subtract  { color: var(--danger); }
.op-intersect { color: var(--blue); }

.obj-name { flex: 1; color: var(--fg); }

.obj-del {
  border: none;
  background: transparent;
  color: var(--dim);
  font-size: 1rem;
  line-height: 1;
  padding: 0 .2rem;
  border-radius: 3px;
  cursor: pointer;
}
.obj-del:hover { color: var(--danger); background: rgba(248,113,113,.1); }

.props-panel {
  border-bottom: 1px solid var(--border);
  overflow-y: auto;
  max-height: 280px;
  flex-shrink: 0;
}

.props-section { padding: .25rem .75rem .35rem; }
.props-label {
  font-size: .65rem;
  color: var(--dim);
  text-transform: uppercase;
  letter-spacing: .06em;
  margin-bottom: .25rem;
}
.props-row { display: flex; gap: .35rem; flex-wrap: wrap; }

.num-field { display: flex; flex-direction: column; gap: .12rem; flex: 1; min-width: 48px; }
.num-label { font-size: .65rem; color: var(--muted); }
.num-field input {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--fg);
  border-radius: 4px;
  padding: .26rem .38rem;
  font-family: inherit;
  font-size: .78rem;
  width: 100%;
  -moz-appearance: textfield;
}
.num-field input::-webkit-outer-spin-button,
.num-field input::-webkit-inner-spin-button { -webkit-appearance: none; }
.num-field input:focus { outline: none; border-color: var(--accent); }

.op-btns { display: flex; gap: .3rem; padding-bottom: .2rem; }
.op-btn {
  font-size: .72rem;
  padding: .26rem .55rem;
  border-color: var(--border);
  color: var(--dim);
  opacity: .7;
}
.op-btn:hover { opacity: 1; }
.op-btn.active { opacity: 1; }
.op-btn[data-op="add"].active      { border-color: var(--accent); color: var(--accent); background: rgba(74,222,128,.08); }
.op-btn[data-op="subtract"].active { border-color: var(--danger); color: var(--danger); background: rgba(248,113,113,.08); }
.op-btn[data-op="intersect"].active{ border-color: var(--blue);   color: var(--blue);   background: rgba(96,165,250,.08); }

.side-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: .5rem;
  padding: .4rem .75rem;
  font-size: .68rem;
  color: var(--dim);
  flex-shrink: 0;
  flex-wrap: wrap;
}
.hint-keys b { color: var(--accent); font-weight: normal; }
.status { color: var(--muted); }
.status.error { color: var(--danger); }
.status.ok    { color: var(--accent); }

/* editor */
#editor { flex: 1; min-height: 0; width: 100%; }

/* viewport */
.viewport-pane { padding: 0; }
#canvas { width: 100%; height: 100%; display: block; touch-action: none; }
.viewport-overlay {
  position: absolute;
  top: .75rem;
  right: .85rem;
  font-size: .7rem;
  color: var(--dim);
  pointer-events: none;
  user-select: none;
}
.axes .x { color: #f87171; }
.axes .y { color: #4ade80; }
.axes .z { color: #60a5fa; }

.sketch-overlay {
  position: absolute;
  top: .75rem;
  left: .85rem;
  display: flex;
  align-items: center;
  gap: .5rem;
  background: rgba(10, 10, 16, .92);
  border: 1px solid var(--blue);
  color: var(--blue);
  padding: .4rem .7rem;
  border-radius: 5px;
  font-size: .72rem;
  pointer-events: none;
  user-select: none;
  z-index: 10;
}
.sketch-overlay kbd {
  font-family: inherit;
  font-size: .68rem;
  background: rgba(96,165,250,.15);
  border: 1px solid rgba(96,165,250,.35);
  padding: 0 .3rem;
  border-radius: 3px;
  color: var(--blue);
}
.sketch-dot {
  width: .5rem;
  height: .5rem;
  border-radius: 50%;
  background: var(--blue);
  animation: sketch-pulse 1s ease-in-out infinite;
}
@keyframes sketch-pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: .35; }
}

/* toast */
.toast {
  position: fixed;
  top: 1.25rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--panel);
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: .55rem 1rem;
  border-radius: 6px;
  font-size: .8rem;
  z-index: 100;
  box-shadow: 0 8px 24px rgba(0,0,0,.5);
  animation: toast-in .2s ease-out;
}
.toast.error { border-color: var(--danger); color: var(--danger); }
@keyframes toast-in {
  from { opacity: 0; transform: translate(-50%, -8px); }
  to   { opacity: 1; transform: translate(-50%, 0); }
}

footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .35rem;
  padding-top: .1rem;
}
footer > a { color: var(--muted); text-decoration: none; font-size: .85rem; }
footer > a:hover { color: var(--accent); }
.credits { font-size: .7rem; color: var(--dim); }
.credits a { color: var(--dim); text-decoration: none; font-size: .7rem; }
.credits a:hover { color: var(--accent); }

@media (max-width: 1100px) {
  .layout {
    grid-template-columns: minmax(200px, 240px) 1fr;
    grid-template-rows: minmax(220px, 40vh) minmax(280px, 1fr);
    grid-template-areas:
      "side editor"
      "side viewport";
  }
  .side-pane { grid-area: side; grid-row: 1 / 3; }
  .editor-pane { grid-area: editor; }
  .viewport-pane { grid-area: viewport; }
}
@media (max-width: 760px) {
  .layout {
    grid-template-columns: 1fr;
    grid-template-rows: auto minmax(180px, 30vh) minmax(280px, 1fr);
    grid-template-areas: "side" "editor" "viewport";
  }
  .side-pane { grid-row: auto; }
  .props-panel { max-height: 200px; }
  .actions { width: 100%; justify-content: flex-start; }
  button { padding: 0.5rem .9rem; font-size: 0.82rem; }
}