:root {
  --bg: #f4f5f8;
  --surface: #ffffff;
  --surface-2: #f8f9fb;
  --border: #e3e5ec;
  --text: #1f2333;
  --muted: #6b7083;
  --accent: #4f46e5;
  --accent-soft: #eef0ff;
  --accent-text: #ffffff;
  --warn: #b45309;
  --danger: #dc2626;
  --canvas-bg: repeating-conic-gradient(#eceef3 0% 25%, #f7f8fa 0% 50%) 0 0 / 16px 16px;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 1px 3px rgba(16, 24, 40, .06);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #11131a;
    --surface: #1a1d27;
    --surface-2: #20242f;
    --border: #2d3240;
    --text: #e6e8ef;
    --muted: #9298ab;
    --accent: #818cf8;
    --accent-soft: #262a45;
    --accent-text: #11131a;
    --warn: #fbbf24;
    --canvas-bg: repeating-conic-gradient(#23262f 0% 25%, #1c1f27 0% 50%) 0 0 / 16px 16px;
    --shadow: none;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 14px/1.45 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
h2 { font-size: 14px; margin: 0; font-weight: 650; }
code { font: 12px ui-monospace, SFMono-Regular, Menlo, monospace; color: var(--muted); }
button, input, select { font: inherit; color: inherit; }

/* ---------- Top bar & tabs ---------- */
.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: stretch; gap: 28px;
  padding: 0 20px; height: 54px;
  background: var(--surface); border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 15px; }
.logo {
  width: 22px; height: 22px; border-radius: 6px;
  background:
    repeating-linear-gradient(90deg, var(--accent) 0 3px, transparent 3px 6px),
    repeating-linear-gradient(0deg, #ec4899 0 3px, transparent 3px 6px);
}
.tabs { display: flex; gap: 4px; }
.tab {
  border: 0; background: none; cursor: pointer;
  padding: 0 14px; font-weight: 600; color: var(--muted);
  border-bottom: 2px solid transparent;
}
.tab:hover { color: var(--text); }
.tab.active { color: var(--accent); border-bottom-color: var(--accent); }

main { padding: 20px; }
.tab-panel { display: none; }


/* ---------- Layout ---------- */
.tab-panel.active { display: flex; flex-direction: column; gap: 16px; max-width: 1400px; margin: 0 auto; }

.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 16px;
}
.hint { color: var(--muted); font-size: 12.5px; margin: 0 0 10px; }
.hint.center { text-align: center; margin: 10px 0 0; }
.muted { color: var(--muted); font-weight: 500; }

/* ---------- Buttons ---------- */
.btn {
  border: 1px solid var(--border); background: var(--surface-2);
  border-radius: 8px; padding: 8px 12px; font-weight: 600; cursor: pointer;
  transition: background .12s, border-color .12s;
}
.btn:hover:not(:disabled) { border-color: var(--accent); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.btn.primary:hover:not(:disabled) { filter: brightness(1.08); }
.btn.ghost { background: transparent; }
.btn.sm { padding: 5px 9px; font-size: 12.5px; }
/* ---------- Action bar ---------- */
.actionbar { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.actionbar label.btn { display: inline-flex; align-items: center; }
.uploads { display: flex; gap: 8px; flex-wrap: wrap; }
.btn.primary.alt { background: #db2777; border-color: #db2777; color: #fff; }
.file-meta strong { word-break: break-word; }
.file-meta span.warn { color: var(--warn); }
.file-meta { flex: 1; min-width: 180px; display: flex; flex-direction: column; line-height: 1.3; }
.file-meta span { color: var(--muted); font-size: 12.5px; }
.downloads { display: flex; gap: 8px; flex-wrap: wrap; }
body.dragging main { outline: 2px dashed var(--accent); outline-offset: -8px; border-radius: 12px; }
button:focus-visible, input:focus-visible, label.btn:focus-within { outline: 2px solid var(--accent); outline-offset: 1px; }
input[type=range] { accent-color: var(--accent); }

/* ---------- Preview ---------- */
.toolbar { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.tools { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; font-size: 13px; }
.zoom { display: flex; align-items: center; gap: 8px; }
.zoom input { width: 140px; }
.zoom span { width: 36px; color: var(--muted); font-variant-numeric: tabular-nums; }

.views { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 14px; }
.views.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
@media (max-width: 1000px) { .views.three { grid-template-columns: 1fr 1fr; } .views.three .view:last-child { grid-column: 1 / -1; } }
@media (max-width: 760px) { .views, .views.three { grid-template-columns: 1fr; } .views.three .view:last-child { grid-column: auto; } }
.view { min-width: 0; display: flex; flex-direction: column; gap: 6px; }
.view-label { font-weight: 600; font-size: 13px; }
.view-label span { color: var(--muted); font-weight: 500; margin-left: 6px; }
.canvas-wrap {
  position: relative; overflow: auto; height: min(62vh, 660px);
  border: 1px solid var(--border); border-radius: 8px; background: var(--canvas-bg);
  padding: 12px;
}
.canvas-wrap canvas { display: block; image-rendering: pixelated; cursor: crosshair; box-shadow: 0 0 0 1px rgba(127,127,127,.35); }
.canvas-wrap:not(.loaded) canvas { display: none; }
.placeholder { position: absolute; inset: 0; display: grid; place-items: center; color: var(--muted); font-size: 13px; }
.canvas-wrap.loaded .placeholder { display: none; }

/* ---------- Inspector ---------- */
.inspector { display: flex; flex-direction: column; gap: 6px; max-height: 70vh; overflow: auto; }
.insp-row { display: grid; grid-template-columns: 150px minmax(0, 1fr); align-items: center; gap: 12px; }
.insp-label { display: flex; flex-direction: column; line-height: 1.2; }
.insp-label strong i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 6px; box-shadow: 0 0 0 1px rgba(127,127,127,.5); }
.insp-label small { color: var(--muted); font-size: 11.5px; }
.insp-strip { overflow-x: auto; }
.insp-strip canvas { display: block; }
.insp-row.is-input .insp-label strong { color: var(--accent); }
.insp-row.is-fill .insp-label strong { color: var(--muted); font-weight: 600; }
.insp-row.is-merge .insp-label strong { color: #db2777; }
.insp-arrow { color: var(--muted); font-size: 12px; padding-left: 162px; }

/* ---------- Tooltip & toast ---------- */
.tooltip {
  position: fixed; z-index: 50; pointer-events: none;
  background: #1f2333; color: #fff; font-size: 12px; line-height: 1.5;
  padding: 7px 9px; border-radius: 7px; box-shadow: 0 4px 14px rgba(0,0,0,.25); white-space: nowrap;
}
.tooltip i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 6px; vertical-align: -1px; box-shadow: 0 0 0 1px rgba(255,255,255,.5); }
.tooltip b { margin-right: 4px; }
.toast {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%); z-index: 60;
  background: #1f2333; color: #fff; padding: 10px 16px; border-radius: 8px; font-weight: 600;
  box-shadow: 0 6px 20px rgba(0,0,0,.25);
}
.toast.err { background: var(--danger); }
[hidden] { display: none !important; }