:root {
  --bg: #0e1320;
  --panel: rgba(20, 26, 42, 0.78);
  --panel-solid: #141a2a;
  --ink: #e8ecff;
  --ink-dim: #9aa3c7;
  --accent: #6d8bff;
  --accent-2: #b58bff;
  --warm: #f6c45c;
  --danger: #ff6b6b;
  --line: rgba(255, 255, 255, 0.12);
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
  /* chip-well: recessed control background (seg control, icon buttons). Dark base. */
  --chip-bg: rgba(0, 0, 0, 0.25);
  /* on-accent: text/icon color painted on top of --accent fills (seg-btn.is-on, btn-primary). */
  --on-accent: #ffffff;
}
/* ===== 3-way theme (Light/Dark/System) — base :root above = native DARK. Opposite (light) WCAG-aware auto-generated (contrast-solving ink/accent vs worst-case surface). ===== */
:root[data-theme="light"]{
  --bg: #f4f4f6;
  --panel: #f5f5f7;
  --panel-solid: #f5f5f7;
  --ink: #002bf5;
  --ink-dim: #5c6aa5;
  --accent: #2e59ff;
  --accent-2: #813aff;
  --warm: #906408;
  --danger: #da0000;
  --line: rgba(0,0,0,0.10);
  --chip-bg: #6c6c6c;
  --on-accent: #ffffff;
}












* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--ink);
  font-family: "Noto Sans KR", system-ui, -apple-system, "Apple SD Gothic Neo", sans-serif;
  -webkit-font-smoothing: antialiased; overflow: hidden; }

.app { position: fixed; inset: 0; }
#scene { position: absolute; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; }

.hidden { display: none !important; }

/* overlays */
.overlay { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; z-index: 5; }
.loading { flex-direction: column; gap: 14px; color: var(--ink-dim); font-size: 14px; }
.spinner { width: 34px; height: 34px; border-radius: 50%; border: 3px solid var(--line); border-top-color: var(--accent); animation: spin 0.9s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* topbar + language switcher */
.topbar { position: absolute; top: max(10px, env(safe-area-inset-top)); right: max(12px, env(safe-area-inset-right)); z-index: 8; }
.topbar [data-i18n-switcher] select,
.topbar select { background: var(--panel); color: var(--ink); border: 1px solid var(--line); border-radius: 999px;
  padding: 6px 10px; font-size: 12px; backdrop-filter: blur(8px); }

/* title card */
.title-card { text-align: center; padding: 36px 30px; max-width: 460px; }
.logo { font-family: "Space Grotesk", "Noto Sans KR", sans-serif; font-weight: 800; font-size: clamp(38px, 11vw, 70px);
  margin: 0 0 6px; letter-spacing: 1px;
  background: linear-gradient(120deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.tagline { color: var(--ink-dim); margin: 0 0 26px; font-size: 15px; }
.hint { color: var(--ink-dim); margin: 18px 0 0; font-size: 12.5px; opacity: 0.85; }

.btn { font: inherit; font-weight: 700; border: none; border-radius: 999px; padding: 13px 26px; cursor: pointer; transition: transform .15s, box-shadow .15s; }
.btn-primary { background: linear-gradient(120deg, var(--accent), var(--accent-2)); color: var(--on-accent); box-shadow: 0 8px 24px rgba(109, 139, 255, 0.4); }
.btn-primary:hover { transform: translateY(-2px); }
.btn-primary:active { transform: translateY(0); }

/* furniture palette (left side) */
.palette { position: absolute; left: max(12px, env(safe-area-inset-left));
  top: 50%; transform: translateY(-50%); z-index: 8; width: 138px;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 12px 10px; backdrop-filter: blur(12px); box-shadow: var(--shadow); }
.palette-title { font-size: 11px; color: var(--ink-dim); margin: 0 0 10px; text-transform: uppercase; letter-spacing: 0.6px; padding: 0 4px; }
.palette-list { display: flex; flex-direction: column; gap: 7px; }
.furn-btn { display: flex; align-items: center; gap: 9px; width: 100%; text-align: left;
  background: var(--chip-bg); border: 1px solid var(--line); border-radius: 11px;
  padding: 9px 10px; color: var(--ink); font: inherit; font-size: 13px; font-weight: 600; cursor: pointer;
  transition: background .15s, border-color .15s, transform .1s; }
.furn-btn:hover { background: color-mix(in oklab, var(--accent) 18%, transparent); }
.furn-btn.is-on { border-color: var(--accent); background: color-mix(in oklab, var(--accent) 26%, transparent); }
.furn-btn:active { transform: scale(0.97); }
.furn-swatch { width: 18px; height: 18px; border-radius: 6px; flex: 0 0 auto; border: 1px solid var(--line); }
.furn-cap { flex: 1 1 auto; line-height: 1.2; }
.furn-ic { font-size: 15px; }

/* bottom toolbar */
.toolbar { position: absolute; left: 50%; transform: translateX(-50%);
  bottom: max(16px, env(safe-area-inset-bottom)); z-index: 8; display: flex; gap: 8px; align-items: center;
  background: var(--panel); border: 1px solid var(--line); border-radius: 999px; padding: 7px 10px; backdrop-filter: blur(10px); box-shadow: var(--shadow); }
.ctl-group { display: flex; align-items: center; gap: 8px; }
.ctl-group + .ctl-group { border-left: 1px solid var(--line); padding-left: 10px; }
.ctl-label { font-size: 11px; color: var(--ink-dim); padding: 0 2px; white-space: nowrap; }
.seg { display: inline-flex; background: var(--chip-bg); border-radius: 999px; padding: 3px; }
.seg-btn { font: inherit; font-size: 12px; font-weight: 600; color: var(--ink-dim); background: transparent; border: none;
  border-radius: 999px; padding: 6px 12px; cursor: pointer; transition: background .15s, color .15s; }
.seg-btn.is-on { background: var(--accent); color: var(--on-accent); }
.icon-btn { font-size: 14px; line-height: 1; color: var(--ink); background: var(--chip-bg); border: 1px solid var(--line);
  border-radius: 999px; padding: 8px 12px; cursor: pointer; display: inline-flex; align-items: center; gap: 6px; font-weight: 600; }
.icon-btn:hover { background: color-mix(in oklab, var(--accent) 18%, transparent); }
.icon-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.icon-btn.danger:hover { background: color-mix(in oklab, var(--danger) 20%, transparent); border-color: var(--danger); }
.icon-btn.danger { color: var(--danger); }

/* selection info (top-left when something is selected) */
.sel-info { position: absolute; left: max(12px, env(safe-area-inset-left));
  top: max(12px, env(safe-area-inset-top)); z-index: 9; max-width: 220px;
  background: var(--panel); border: 1px solid var(--accent); border-radius: var(--radius);
  padding: 12px 14px; backdrop-filter: blur(12px); box-shadow: var(--shadow); }
.sel-head { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.sel-head strong { font-size: 15px; color: var(--ink); }
.sel-swatch { width: 16px; height: 16px; border-radius: 5px; border: 1px solid var(--line); }
.sel-grid { display: grid; gap: 5px; font-size: 12px; }
.sel-grid > div { display: flex; justify-content: space-between; gap: 8px; }
.sel-grid dt { color: var(--ink-dim); margin: 0; }
.sel-grid dd { margin: 0; color: var(--ink); font-weight: 600; font-variant-numeric: tabular-nums; }

/* dimension HUD (top-right, below language switcher) */
.dim-hud { position: absolute; right: max(14px, env(safe-area-inset-right)); top: 54px; z-index: 8;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 10px 14px; backdrop-filter: blur(12px); box-shadow: var(--shadow); font-size: 12px; }
.dim-hud .dim-row { display: flex; justify-content: space-between; gap: 14px; }
.dim-hud .dim-row + .dim-row { margin-top: 4px; }
.dim-hud dt { color: var(--ink-dim); margin: 0; }
.dim-hud dd { margin: 0; color: var(--ink); font-weight: 700; font-variant-numeric: tabular-nums; }
.dim-unit { color: var(--ink-dim); font-weight: 400; margin-left: 2px; }

.foot { position: absolute; left: 50%; transform: translateX(-50%); bottom: max(74px, calc(env(safe-area-inset-bottom) + 64px));
  z-index: 4; margin: 0; font-size: 12px; color: var(--ink-dim); opacity: 0.7; text-align: center; pointer-events: none; white-space: nowrap; }

/* toast */
.toast { position: absolute; left: 50%; transform: translateX(-50%) translateY(10px); top: 64px;
  z-index: 12; background: var(--panel-solid); border: 1px solid var(--line); border-radius: 999px;
  padding: 8px 16px; font-size: 12.5px; color: var(--ink); box-shadow: var(--shadow); opacity: 0;
  transition: opacity .2s, transform .2s; pointer-events: none; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.is-warn { border-color: var(--danger); color: var(--danger); }

@media (max-width: 540px) {
  .foot { display: none; }
  .ctl-label { display: none; }
  .palette { width: 116px; padding: 10px 8px; }
  .furn-btn { padding: 8px 8px; font-size: 12px; }
  .dim-hud { font-size: 11px; padding: 8px 11px; }
  /* QA/FAB-collision: the GitHub Sponsors .pmp-fab is fixed bottom-right (~34px tall,
     ~56px wide incl. safe-area). The centered bottom toolbar must not overlap it on
     narrow screens. Reserve a right gutter and raise the HUD above the FAB band. */
  .toolbar {
    max-width: calc(100vw - 64px);
    padding-right: 14px;
    bottom: max(56px, calc(env(safe-area-inset-bottom) + 46px));
  }
}
@media (prefers-reduced-motion: reduce) { .spinner, .btn-primary { animation: none; transition: none; } }