:root {
  --bg: #0b0f14;
  --panel: #121822;
  --panel-2: #0f1520;
  --text: #e6eef8;
  --muted: #aac0d0;
  --accent: #4ea1ff;
  --accent-2: #2b66ff;
  --border: #233042;
  --ok: #1fdd89;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, Noto Sans, sans-serif;
  background: radial-gradient(1200px 800px at 20% -10%, #1a2330, transparent),
              radial-gradient(900px 600px at 120% 10%, #102036, transparent),
              var(--bg);
  color: var(--text);
}

.app-header { padding: 24px 16px; text-align: center; }
.app-header h1 { margin: 0 0 6px; font-weight: 700; letter-spacing: 0.2px; }
.subtitle { margin: 0; color: var(--muted); }

.container { max-width: 1100px; margin: 0 auto; padding: 0 16px 40px; }

.uploader { display: grid; gap: 12px; justify-items: center; margin-bottom: 20px; }

.button { cursor: pointer; border: 1px solid var(--border); background: var(--panel); color: var(--text); padding: 10px 16px; border-radius: 10px; }
.button.primary { background: linear-gradient(180deg, var(--accent), var(--accent-2)); border: none; color: #fff; }
.button[disabled] { opacity: 0.6; cursor: not-allowed; }

.dropzone { width: 100%; max-width: 900px; min-height: 150px; border: 2px dashed var(--border); border-radius: 16px; background: color-mix(in oklab, var(--panel) 60%, transparent); display: grid; place-items: center; outline: none; }
.dropzone:focus { border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in oklab, var(--accent) 30%, transparent); }
.dropzone.dragover { border-color: var(--accent); background: color-mix(in oklab, var(--panel) 80%, transparent); }
.dropzone-inner { padding: 24px; text-align: center; }
.dz-icon { font-size: 34px; margin-bottom: 6px; }
.dz-text { font-weight: 600; }
.dz-sub { color: var(--muted); font-size: 12px; }

.file-info { color: var(--muted); font-size: 12px; }

.workspace { display: grid; grid-template-columns: 1fr 360px; gap: 16px; align-items: start; }
@media (max-width: 980px) { .workspace { grid-template-columns: 1fr; } }

.preview-panel { background: var(--panel-2); border: 1px solid var(--border); border-radius: 16px; padding: 12px; overflow: auto; min-height: 200px; }
.preview { max-width: 100%; height: auto; display: block; margin: 0 auto; background: repeating-conic-gradient(#0000 0 25%, #0001 0 50%) 50% / 20px 20px; border-radius: 8px; }

.controls { background: var(--panel); border: 1px solid var(--border); border-radius: 16px; padding: 14px; position: sticky; top: 14px; }
.controls[aria-disabled="true"] { opacity: 0.6; filter: grayscale(0.2); }
.controls h2 { margin: 8px 0 8px; font-size: 16px; }

.grid.two { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
@media (max-width: 480px) { .grid.two { grid-template-columns: 1fr; } }

.form-row { display: grid; gap: 6px; }
.form-row label { color: var(--muted); font-size: 12px; }

.range-wrap { display: grid; grid-template-columns: 1fr auto; gap: 8px; align-items: center; }
input[type="range"] { width: 100%; }
output { font-variant-numeric: tabular-nums; }

.size-inputs { display: grid; grid-template-columns: 1fr auto 1fr; gap: 8px; align-items: center; }
.times { color: var(--muted); }
input[type="number"], select, input[type="color"] {
  width: 100%;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 10px;
}

.checkbox { display: inline-flex; gap: 8px; align-items: center; color: var(--muted); font-size: 12px; }

.actions { display: flex; gap: 8px; justify-content: end; margin-top: 10px; }

.app-footer { text-align: center; color: var(--muted); padding: 20px; font-size: 12px; }