:root {
  color-scheme: light;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--tt-bg, #f5f7fb);
  color: var(--tt-text, #172033);
}
.shell { width: min(1180px, calc(100% - 32px)); margin: 0 auto; padding: 28px 0 48px; }
.hero {
  background: linear-gradient(135deg, var(--tt-surface, #ffffff), rgba(37, 99, 235, .08));
  border: 1px solid var(--tt-line, #d9e1ef);
  border-radius: var(--tt-radius, 12px);
  padding: 26px;
  margin-bottom: 18px;
}
.eyebrow { margin: 0 0 8px; color: var(--tt-primary, #2563eb); font-weight: 700; letter-spacing: .04em; text-transform: uppercase; font-size: .8rem; }
h1 { margin: 0 0 10px; font-size: clamp(2rem, 5vw, 4rem); line-height: 1; }
#privacy-note { margin: 0; max-width: 720px; color: var(--tt-muted, #5d6b82); font-size: 1.12rem; }
.tool { display: grid; grid-template-columns: minmax(300px, 420px) 1fr; gap: 18px; align-items: start; }
.panel { background: var(--tt-surface, #ffffff); border: 1px solid var(--tt-line, #d9e1ef); border-radius: var(--tt-radius, 12px); padding: 18px; box-shadow: 0 14px 40px rgba(23, 32, 51, .06); }
.drop-zone { display: grid; place-items: center; text-align: center; min-height: 170px; padding: 24px; border: 2px dashed var(--tt-line, #d9e1ef); border-radius: var(--tt-radius, 12px); cursor: pointer; background: var(--tt-bg, #f5f7fb); transition: border-color .15s, background .15s; }
.drop-zone.dragover, .drop-zone:hover { border-color: var(--tt-primary, #2563eb); background: rgba(37, 99, 235, .07); }
.drop-title { display: block; font-size: 1.2rem; font-weight: 800; }
.drop-help { display: block; margin-top: 8px; color: var(--tt-muted, #5d6b82); }
#image-input { margin-top: 16px; width: 100%; max-width: 290px; }
.quality { border: 0; padding: 0; margin: 18px 0; }
.quality legend { font-weight: 800; margin-bottom: 10px; }
.quality-card { display: flex; gap: 10px; align-items: flex-start; padding: 13px; border: 1px solid var(--tt-line, #d9e1ef); border-radius: var(--tt-radius, 12px); margin-bottom: 10px; cursor: pointer; }
.quality-card:has(input:checked) { border-color: var(--tt-primary, #2563eb); box-shadow: 0 0 0 3px rgba(37, 99, 235, .12); }
.quality-card small { display: block; margin-top: 4px; color: var(--tt-muted, #5d6b82); line-height: 1.35; }
.primary { width: 100%; border: 0; border-radius: var(--tt-radius, 12px); padding: 14px 16px; background: var(--tt-primary, #2563eb); color: white; font-weight: 800; font-size: 1rem; cursor: pointer; }
.primary:hover { background: var(--tt-primary-dark, #1d4ed8); }
.primary:disabled { opacity: .62; cursor: wait; }
.message { min-height: 1.4em; margin: 12px 0 0; font-weight: 700; }
.error { color: var(--tt-danger, #b42318); }
.progress { color: var(--tt-success, #087443); }
.result-top { display: flex; justify-content: space-between; gap: 14px; align-items: flex-start; }
h2 { margin: 0 0 4px; }
.result-top p, .empty { margin: 0; color: var(--tt-muted, #5d6b82); }
.download { display: inline-flex; align-items: center; justify-content: center; white-space: nowrap; min-height: 40px; padding: 10px 14px; border-radius: var(--tt-radius, 12px); background: var(--tt-success, #087443); color: white; text-decoration: none; font-weight: 800; }
.download.disabled, .download[aria-disabled="true"] { background: var(--tt-line, #d9e1ef); color: var(--tt-muted, #5d6b82); pointer-events: none; }
.preview-controls { display: flex; flex-wrap: wrap; gap: 12px; margin: 16px 0; }
.preview-controls label { border: 1px solid var(--tt-line, #d9e1ef); border-radius: 999px; padding: 8px 12px; cursor: pointer; }
.preview-controls label:has(input:checked) { border-color: var(--tt-primary, #2563eb); color: var(--tt-primary, #2563eb); font-weight: 800; }
.canvas-wrap { width: 100%; min-height: 260px; border: 1px solid var(--tt-line, #d9e1ef); border-radius: var(--tt-radius, 12px); padding: 12px; overflow: auto; }
.checker { background-color: #fff; background-image: linear-gradient(45deg, #e8eef8 25%, transparent 25%), linear-gradient(-45deg, #e8eef8 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #e8eef8 75%), linear-gradient(-45deg, transparent 75%, #e8eef8 75%); background-size: 24px 24px; background-position: 0 0, 0 12px, 12px -12px, -12px 0; }
.canvas-wrap.white { background: #fff; }
#result-canvas { display: block; max-width: 100%; height: auto; margin: 0 auto; }
.empty { padding: 42px 0; text-align: center; }
.content-slot { margin-top: 22px; }
@media (max-width: 820px) {
  .shell { width: min(100% - 20px, 720px); padding-top: 12px; }
  .tool { grid-template-columns: 1fr; }
  .result-top { flex-direction: column; }
  .download { width: 100%; }
}