/* ──────────────────────────────────────────────────────────────────────────
   Online 3D Viewer
   The drop screen (as Markdown to PDF and Video to GIF have it), then a
   full-height 3D stage with one toolbar. Built on the shared Generic Soft UI
   tokens (dark.css / light.css / shared.css).
   ────────────────────────────────────────────────────────────────────────── */

/* The viewer's own colours, as tokens in both themes. */
/* The stage is a soft vertical gradient (top, then bottom), so a white model
   still stands out in day mode and a dark one at night. */
:root {
  --o3v-stage: #1B2742;
  --o3v-stage2: #080E1A;
  --o3v-model: #A9C0E2;
  --o3v-grid: #33435F;
  --o3v-grid2: #233149;
  --o3v-edge: #0B1322;
}
body.light {
  --o3v-stage: #EEF2F9;
  --o3v-stage2: #BCC8DB;
  --o3v-model: #8EA7CC;
  --o3v-grid: #A9B7CF;
  --o3v-grid2: #C3CEDF;
  --o3v-edge: #14203A;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* ── HEADER ── */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 22px;
  margin: 0;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  gap: 16px;
  z-index: 10;
}
.header-left { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; }
.logo { margin: 0; line-height: inherit; font-size: 1.2rem; font-weight: 800; letter-spacing: -0.04em; }
.logo span { color: var(--accent); }

/* ── DROP ZONE ── */
#dropZone {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin: 28px;
  padding: 40px 24px;
  min-height: 420px;
  border: 2px dashed var(--border);
  border-radius: 16px;
  background: var(--card-bg);
  cursor: pointer;
  transition: border-color 0.2s, background-color 0.2s;
  position: relative;
  overflow: hidden;
  text-align: center;
}
#dropZone:hover, #dropZone.dragover { border-color: var(--accent); background: var(--input-bg); }
#dropZone input[type=file] { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%; }
#dropZone .btn-secondary { position: relative; z-index: 2; margin-top: 6px; }
.drop-icon { line-height: 0; }
.drop-title { font-size: 1.25rem; font-weight: 800; letter-spacing: -0.01em; }
.drop-sub { font-size: 0.88rem; color: var(--muted); max-width: 520px; }
.drop-groups { display: flex; flex-direction: column; align-items: center; gap: 7px; margin-top: 6px; }
.drop-group { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 6px; }
.drop-group-label { font-size: var(--fs-xs); font-weight: 700; color: var(--muted); min-width: 44px; text-align: right; margin-right: 2px; }
.fmt-badge {
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 2px 8px;
  font-size: 0.74rem;
  font-family: 'DM Mono', monospace;
  color: var(--muted);
  white-space: nowrap;
}
.drop-hint { font-size: 0.8rem; color: var(--muted); max-width: 520px; line-height: 1.5; }
.drop-error {
  display: none;
  position: relative;
  z-index: 2;
  max-width: 560px;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  background: var(--warning-bg);
  color: var(--warning-text);
  font-size: 0.86rem;
  line-height: 1.5;
  cursor: default;
}
.drop-error.visible { display: block; }

/* A message with a spinner over whatever is loading. */
.busy {
  position: absolute;
  inset: 0;
  z-index: 5;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  cursor: progress;
}
.busy.visible { display: flex; }
.busy-msg { font-weight: 600; font-size: 0.92rem; color: var(--text); max-width: 420px; text-align: center; padding: 0 16px; }
.spinner {
  width: 34px; height: 34px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* ── WORKSPACE ── */
#workspace { display: none; flex-direction: column; height: calc(100dvh - var(--o3v-header, 58px)); min-height: 360px; }
#workspace.active { display: flex; }

.viewer-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px 16px;
  flex-wrap: wrap;
  padding: 8px 16px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.vb-file { display: flex; align-items: center; gap: 8px; min-width: 0; flex: 1 1 180px; }
.vb-name { font-weight: 700; font-size: 0.92rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.vb-tools { display: flex; align-items: center; gap: 8px 14px; flex-wrap: wrap; justify-content: flex-end; }
.vb-toggle { display: inline-flex; align-items: center; gap: 7px; cursor: pointer; user-select: none; }
.vb-toggle-label { font-size: 0.84rem; font-weight: 600; color: var(--text); white-space: nowrap; display: inline-flex; align-items: center; gap: 5px; }
.vb-up { display: inline-flex; align-items: center; gap: 7px; }
.vb-up .seg-btn { padding: 3px 11px; }
.vb-square { min-width: 32px; padding-left: 8px; padding-right: 8px; }

.stage {
  position: relative;
  flex: 1;
  min-height: 0;
  background: linear-gradient(var(--o3v-stage), var(--o3v-stage2));
  overflow: hidden;
  touch-action: none;
}
.viewer-canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; outline: none; }

.info-card {
  position: absolute;
  left: 14px;
  bottom: 14px;
  z-index: 2;
  margin: 0;
  padding: 10px 14px;
  display: grid;
  gap: 3px;
  min-width: 210px;
  background: color-mix(in srgb, var(--panel) 90%, transparent);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  font-size: 0.82rem;
}
.info-card > div { display: flex; justify-content: space-between; gap: 18px; }
.info-card > div[hidden] { display: none; }
.info-card dt { color: var(--muted); font-weight: 600; display: inline-flex; align-items: center; gap: 5px; }
.info-card dd { margin: 0; font-family: 'DM Mono', monospace; font-variant-numeric: tabular-nums; text-align: right; }

.stage-note {
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  width: min(640px, calc(100% - 24px));
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 9px 8px 9px 14px;
  border-radius: var(--radius-md);
  background: var(--warning-bg);
  color: var(--warning-text);
  font-size: 0.84rem;
  line-height: 1.5;
  box-shadow: var(--shadow-lg);
}
.stage-note[hidden] { display: none; }
.stage-note.is-error { background: var(--error-bg); color: var(--error-text); }
.stage-note-text { flex: 1; }
.stage-note-text p { margin: 0; color: inherit; }
.stage-note-text p + p { margin-top: 4px; }
.stage-note .btn-bare { color: inherit; }

.stage-hint {
  position: absolute;
  right: 14px;
  bottom: 14px;
  z-index: 2;
  font-size: 0.76rem;
  color: var(--muted);
  pointer-events: none;
  transition: opacity 0.6s;
}
.stage-hint.gone { opacity: 0; }

.stage-drop {
  position: absolute;
  inset: 10px;
  z-index: 4;
  display: none;
  align-items: center;
  justify-content: center;
  border: 2px dashed var(--accent);
  border-radius: 14px;
  background: color-mix(in srgb, var(--bg) 70%, transparent);
  font-weight: 700;
  font-size: 1.1rem;
  pointer-events: none;
}
.stage.dragover .stage-drop { display: flex; }

/* ── FOOTER ── */
.page-footer { flex-shrink: 0; padding: 16px 20px; }
.page-footer-info { margin-top: 0; }
.page-footer-info a { color: var(--accent); text-decoration: none; }

/* ── RESPONSIVE ── */
@media (max-width: 720px) {
  .header { flex-wrap: wrap; padding: 10px 14px; }
  #dropZone { margin: 14px; padding: 28px 16px; min-height: 380px; }
  .drop-group-label { min-width: 0; text-align: center; width: 100%; }
  .viewer-bar { padding: 8px 12px; }
  .vb-tools { justify-content: flex-start; gap: 8px 12px; }
  .info-card { left: 8px; bottom: 8px; min-width: 0; font-size: 0.76rem; padding: 8px 10px; gap: 2px; }
  .info-card > div { gap: 12px; }
  .stage-hint { display: none; }
}