:root {
  --bg: #11141a;
  --panel: #1c1f24;
  --fg: #e9ecef;
  --muted: #8b8f96;
  --accent: #7dd3fc;
  --accent-2: #38bdf8;
  --danger: #ef4444;
  --ok: #22c55e;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; min-height: 100%; background: var(--bg); color: var(--fg);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-2); }
code { font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, "Courier New", monospace; background: #0d1117; padding: 1px 6px; border-radius: 4px; }

header { padding: 32px 24px 16px; text-align: center; }
header h1 { margin: 0; font-size: 32px; letter-spacing: 4px; font-weight: 700; }
header .sub { color: var(--muted); margin: 4px 0 0; }

main { max-width: 720px; margin: 24px auto; padding: 0 16px 64px; }

.drop-zone {
  border: 2px dashed #2d333b;
  border-radius: 14px;
  padding: 56px 16px;
  text-align: center;
  background: var(--panel);
  transition: border-color .15s, background .15s;
}
.drop-zone.over { border-color: var(--accent-2); background: #142028; }
.drop-zone p { margin: 8px 0; }
.drop-zone .hint { color: var(--muted); font-size: 13px; }

button {
  background: #2d333b; color: var(--fg); border: 1px solid #3a414b; border-radius: 8px;
  padding: 8px 14px; font-size: 14px; cursor: pointer; transition: background .12s, border-color .12s;
}
button:hover { background: #3a414b; }
button:active { background: #1f242b; }
button:disabled { opacity: 0.35; cursor: not-allowed; }
button:disabled:hover { background: #2d333b; }
button.primary { background: var(--accent-2); border-color: var(--accent-2); color: #052028; }
button.primary:hover { background: var(--accent); border-color: var(--accent); }
button.danger { background: #401517; border-color: #6b1f24; color: #fda4a4; }
button.danger:hover { background: #5b1d22; border-color: var(--danger); color: #fee2e2; }
button.danger:disabled { background: #2d333b; color: var(--muted); border-color: #3a414b; }

.status { color: var(--muted); font-size: 14px; margin-top: 12px; min-height: 1.2em; }
.status.ok { color: var(--ok); }
.status.err { color: var(--danger); }

.recent { margin-top: 32px; }
.recent h2 { font-size: 14px; color: var(--muted); text-transform: uppercase; letter-spacing: 2px; }
.recent ul { list-style: none; padding: 0; margin: 8px 0 0; }
.recent li { padding: 8px 12px; background: var(--panel); border-radius: 8px; margin-bottom: 6px;
  display: flex; gap: 12px; align-items: center; }
.recent li.empty { color: var(--muted); justify-content: center; font-style: italic; }
.recent li .name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.recent li .meta { color: var(--muted); font-size: 12px; }

footer { text-align: center; color: var(--muted); padding: 24px; font-size: 12px; }

/* viewer page */
.viewer-body { display: flex; flex-direction: column; height: 100vh; overflow: hidden; }
.viewer-header { display: flex; gap: 16px; align-items: center; padding: 10px 16px;
  background: var(--panel); border-bottom: 1px solid #2d333b; font-size: 14px; }
.viewer-header .filename { flex: 1; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.viewer-header .size { color: var(--muted); }
.viewer-header .back, .viewer-header .raw { padding: 4px 10px; border-radius: 6px; background: #2d333b; }
.viewer-header .back:hover, .viewer-header .raw:hover { background: #3a414b; color: var(--fg); }

#canvas-wrap { flex: 1; position: relative; }
#stage { width: 100%; height: 100%; display: block; }

.error-log {
  position: absolute; bottom: 16px; right: 16px; z-index: 30;
  display: flex; flex-direction: column-reverse; gap: 6px;
  max-width: 380px; max-height: 60vh; overflow-y: auto;
  pointer-events: auto;
}
.error-card {
  background: rgba(64, 21, 23, 0.95); color: #fee2e2;
  border: 1px solid var(--danger); border-radius: 8px;
  padding: 8px 32px 8px 12px; position: relative;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, monospace;
  font-size: 12px; line-height: 1.45;
  user-select: text; cursor: text;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}
.error-card.info { background: rgba(13, 50, 80, 0.95); color: #cffafe; border-color: var(--accent-2); }
.error-card .t { color: var(--muted); font-size: 10px; margin-bottom: 3px; letter-spacing: 0.5px; }
.error-card .body { white-space: pre-wrap; word-break: break-word; }
.error-card .x {
  position: absolute; top: 4px; right: 6px;
  background: transparent; border: none; color: inherit;
  cursor: pointer; font-size: 18px; line-height: 1; padding: 0 4px; opacity: 0.7;
}
.error-card .x:hover { opacity: 1; background: transparent; }
.error-clear-all {
  align-self: flex-end;
  background: rgba(28,31,36,0.9); color: var(--muted); border: 1px solid #2d333b;
  border-radius: 6px; padding: 2px 8px; font-size: 11px; cursor: pointer;
}
.error-clear-all:hover { color: var(--fg); border-color: var(--accent-2); background: rgba(28,31,36,0.9); }

/* Full-viewport busy overlay — used by drill, erase, and export.
   Dim backdrop + centered spinner + label, with crisp text that stays
   readable even when the CSG main-thread block freezes the animation. */
.busy-overlay {
  position: fixed; inset: 0; z-index: 60;
  background: rgba(0, 0, 0, 0.45); backdrop-filter: blur(2px);
  display: none; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 14px; pointer-events: none;
}
.busy-overlay.open { display: flex; }
.busy-spinner-big {
  width: 56px; height: 56px;
  border: 5px solid rgba(255, 255, 255, 0.18);
  border-top-color: var(--accent-2);
  border-radius: 50%;
  animation: busy-spin-big 0.7s linear infinite;
  box-shadow: 0 0 30px rgba(56, 189, 248, 0.35);
}
.busy-label {
  color: var(--accent);
  font-size: 13px; font-weight: 700;
  letter-spacing: 3px; text-transform: uppercase;
  text-shadow: 0 1px 2px rgba(0,0,0,0.7);
}
@keyframes busy-spin-big { to { transform: rotate(360deg); } }

.drill-cursor {
  position: fixed; pointer-events: none; z-index: 45;
  box-sizing: border-box;
  border: 1.5px solid #ef4444;
  background: rgba(239, 68, 68, 0.18);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.45);
  display: none;
}
.drill-cursor.square { border-radius: 3px; }
.drill-cursor::after {
  content: attr(data-size);
  position: absolute; left: calc(100% + 8px); top: 50%;
  transform: translateY(-50%);
  font-family: ui-monospace, monospace; font-size: 11px;
  color: #fca5a5; background: rgba(0,0,0,0.55);
  padding: 1px 6px; border-radius: 4px; white-space: nowrap;
}
body.drill-mode { cursor: crosshair; }

.angle-readout {
  position: fixed; z-index: 50;
  pointer-events: none;
  background: rgba(13, 17, 23, 0.94); color: var(--accent);
  border: 1px solid var(--accent-2); border-radius: 10px;
  padding: 5px 10px; font-size: 15px; font-weight: 700;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, monospace;
  letter-spacing: 0.5px; line-height: 1;
  backdrop-filter: blur(6px);
  display: none;
}

.home-btn {
  position: absolute; bottom: 16px; left: 16px; z-index: 40;
  width: 40px; height: 40px; padding: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(28,31,36,0.92); color: var(--accent);
  border: 1px solid #2d333b; border-radius: 10px;
  backdrop-filter: blur(8px);
  cursor: pointer; transition: color .12s, border-color .12s, transform .12s;
}
.home-btn:hover { color: var(--accent-2); border-color: var(--accent); }
.home-btn:active { transform: scale(0.94); }
.home-btn svg { display: block; }

.hud { position: fixed; top: 64px; right: 16px; z-index: 40; background: rgba(28,31,36,0.92); backdrop-filter: blur(8px);
  border: 1px solid #2d333b; border-radius: 12px; padding: 12px 14px 12px 14px; padding-right: 38px; font-size: 13px; min-width: 220px; }
.hud-toggle {
  position: absolute; top: 6px; right: 6px;
  width: 24px; height: 24px; padding: 0;
  display: flex; align-items: center; justify-content: center;
  background: transparent; color: var(--muted);
  border: 1px solid #2d333b; border-radius: 6px;
  font-size: 16px; line-height: 1; font-weight: 700; cursor: pointer;
}
.hud-toggle:hover { color: var(--fg); border-color: var(--accent-2); background: transparent; }
/* When collapsed: shrink the panel but turn the toggle into an unmissable pill */
.hud.collapsed { padding: 0; min-width: 0; border: none; background: transparent; backdrop-filter: none; }
.hud.collapsed > *:not(.hud-toggle) { display: none; }
.hud.collapsed .hud-toggle {
  position: static;
  width: auto; height: 40px;
  padding: 0 14px;
  font-size: 14px; font-weight: 600;
  background: rgba(28,31,36,0.92); color: var(--accent);
  border: 1px solid #2d333b; border-radius: 10px;
  backdrop-filter: blur(8px); letter-spacing: 0.4px;
}
.hud.collapsed .hud-toggle:hover { background: rgba(28,31,36,0.95); color: var(--accent-2); border-color: var(--accent-2); }
.hud-row { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; flex-wrap: wrap; }
.hud-row:last-child { margin-bottom: 0; }
.hud-row label { color: var(--muted); width: 80px; }
.hud-row button { padding: 4px 10px; font-size: 12px; }
.hud-row button.bg { width: 22px; height: 22px; padding: 0; border-radius: 50%; }
.hud-row button.active { background: var(--accent-2); color: #052028; border-color: var(--accent-2); }
.hud-row button.active:hover { background: var(--accent); border-color: var(--accent); }
.hud-row.stats { display: block; color: var(--muted); font-size: 12px; padding-top: 6px; border-top: 1px solid #2d333b; }
.hud-row.hint  { display: block; color: var(--muted); font-size: 11px; padding-top: 4px; }

/* version pill + modal --------------------------------------------------- */
.version-pill {
  background: #0d1117; color: var(--accent); border: 1px solid #2d333b;
  border-radius: 999px; padding: 2px 10px; font-size: 12px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, monospace;
  cursor: pointer; min-width: 56px;
}
.version-pill:hover { border-color: var(--accent); color: var(--accent-2); background: #0d1117; }
.version-pill:disabled { color: var(--muted); cursor: default; }

.version-modal {
  position: fixed; inset: 0; z-index: 1000;
  opacity: 0; transition: opacity .15s ease;
  display: flex; align-items: center; justify-content: center;
}
.version-modal.open { opacity: 1; }
.version-modal-backdrop {
  position: absolute; inset: 0; background: rgba(0,0,0,0.55); backdrop-filter: blur(2px);
}
.version-modal-panel {
  position: relative; z-index: 1; background: var(--panel); color: var(--fg);
  border: 1px solid #2d333b; border-radius: 14px;
  width: min(680px, 92vw); max-height: 80vh; display: flex; flex-direction: column;
  box-shadow: 0 30px 80px rgba(0,0,0,0.55);
}
.version-modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 18px; border-bottom: 1px solid #2d333b;
}
.version-modal-header h3 { margin: 0; font-size: 16px; letter-spacing: 1px; }
.version-modal-close {
  background: transparent; border: none; color: var(--muted);
  font-size: 22px; line-height: 1; padding: 0 6px; cursor: pointer;
}
.version-modal-close:hover { color: var(--fg); background: transparent; }
.version-modal-body {
  overflow-y: auto; padding: 8px 18px 18px;
}
.commit { padding: 12px 0; border-bottom: 1px solid #232831; }
.commit:last-child { border-bottom: none; }
.commit-subject {
  font-weight: 600; font-size: 14px; line-height: 1.35;
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
}
.commit-tag {
  background: var(--accent-2); color: #052028; padding: 1px 8px;
  border-radius: 999px; font-size: 11px; font-weight: 700; letter-spacing: 0.5px;
}
.commit-meta { color: var(--muted); font-size: 12px; margin-top: 4px; }
.commit-meta code { background: #0d1117; padding: 1px 6px; border-radius: 4px; font-size: 11px; }
.commit-body {
  color: var(--muted); font-size: 12.5px; margin-top: 6px;
  white-space: pre-wrap; line-height: 1.45;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, monospace;
}

/* When a mesh is selected, show a hint about delete and outline the canvas */
body.has-selection #canvas-wrap { box-shadow: inset 0 0 0 2px var(--accent-2); }
body.has-selection #canvas-wrap::after {
  content: "selected — press Delete to remove";
  position: absolute; left: 50%; bottom: 16px; transform: translateX(-50%);
  background: rgba(56,189,248,0.92); color: #052028; padding: 6px 14px;
  border-radius: 999px; font-size: 13px; font-weight: 600;
  pointer-events: none;
}