:root {
  color-scheme: light;
  --page: #f9f9f7;
  --surface-1: #fcfcfb;
  --text-primary: #0b0b0b;
  --text-secondary: #52514e;
  --text-muted: #898781;
  --gridline: #e1e0d9;
  --baseline: #c3c2b7;
  --border: rgba(11, 11, 11, 0.10);
  --series-1: #2a78d6;
  --danger: #d03b3b;
  --good: #0ca30c;
}
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --page: #0d0d0d;
    --surface-1: #1a1a19;
    --text-primary: #ffffff;
    --text-secondary: #c3c2b7;
    --text-muted: #898781;
    --gridline: #2c2c2a;
    --baseline: #383835;
    --border: rgba(255, 255, 255, 0.10);
    --series-1: #3987e5;
    --danger: #e66767;
    --good: #0ca30c;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--page);
  color: var(--text-primary);
  line-height: 1.5;
}

main, .app-header, .app-footer { max-width: 980px; margin: 0 auto; padding: 0 16px; }
.app-header { padding-top: 32px; }
.app-header h1 { margin: 0; font-size: 28px; }
.tagline { margin: 4px 0 20px; color: var(--text-secondary); max-width: 72ch; }
.tagline a { color: var(--series-1); white-space: nowrap; }

.btn {
  appearance: none; font: inherit; cursor: pointer;
  padding: 8px 16px; border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface-1); color: var(--text-primary);
}
.btn:hover { border-color: var(--baseline); }
.btn-primary { background: var(--series-1); border-color: var(--series-1); color: #fff; }
.btn-primary:hover { filter: brightness(1.08); }
.btn-small { padding: 4px 10px; font-size: 13px; }

.controls { display: flex; gap: 8px; flex-wrap: wrap; }

.status { margin: 12px 0; font-size: 14px; }
.status-idle { color: var(--text-muted); }
.status-scan { color: var(--series-1); }
.status-ok { color: var(--good); font-weight: 600; }
.status-error { color: var(--danger); }

.stage-wrap { position: relative; }
#view {
  display: block; width: 100%; height: auto;
  border-radius: 12px; border: 1px solid var(--border);
  background: var(--surface-1);
}
.inspector {
  position: absolute; z-index: 5; pointer-events: none;
  background: rgba(10, 10, 10, 0.88); color: #fff;
  font-size: 12px; padding: 5px 9px; border-radius: 7px;
  max-width: 340px;
}

.overlay-controls {
  display: flex; align-items: center; gap: 20px; flex-wrap: wrap;
  margin: 12px 0 20px; font-size: 14px; color: var(--text-secondary);
  transition: opacity 0.3s ease;
}

.overlay-controls.live { opacity: 0.35; pointer-events: none; }
.oc-group { display: inline-flex; align-items: center; gap: 10px; }
.oc-group label { display: inline-flex; align-items: center; gap: 4px; cursor: pointer; }
.oc-group input { accent-color: var(--series-1); }

.panels { display: grid; grid-template-columns: 300px 1fr; gap: 16px; align-items: start; }
@media (max-width: 760px) { .panels { grid-template-columns: 1fr; } }

.panel {
  background: var(--surface-1); border: 1px solid var(--border);
  border-radius: 12px; padding: 16px;
}
.panel h2 { margin: 0 0 10px; font-size: 16px; }
.panel h3 { margin: 18px 0 8px; font-size: 14px; }
.hint { font-weight: 400; color: var(--text-muted); font-size: 12px; }

.pipeline { list-style: none; margin: 0; padding: 0; }
.pipeline li { padding: 7px 0; border-bottom: 1px solid var(--gridline); }
.pipeline li:last-child { border-bottom: none; }
.stage-head { display: flex; justify-content: space-between; font-weight: 600; font-size: 14px; }
.stage-ok .stage-head { color: var(--text-primary); }
.stage-fail .stage-head { color: var(--danger); }
.stage-ms { color: var(--text-muted); font-weight: 400; font-size: 12px; font-variant-numeric: tabular-nums; }
.stage-info { font-size: 13px; color: var(--text-secondary); }

.payload-text {
  font-size: 17px; font-weight: 600; word-break: break-all;
  background: var(--page); border: 1px solid var(--gridline);
  border-radius: 8px; padding: 10px 12px;
}
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.chip {
  font-size: 12px; padding: 3px 9px; border-radius: 999px;
  border: 1px solid var(--baseline); color: var(--text-secondary);
}
.chip-good { border-color: var(--good); color: var(--good); }
.chip-warn { border-color: var(--danger); color: var(--danger); }

.codeword-dump { display: flex; flex-direction: column; gap: 8px; }
.block-row { font-size: 12px; }
.block-label { display: block; color: var(--text-muted); margin-bottom: 3px; }
.byte-strip { display: flex; flex-wrap: wrap; gap: 2px; }
.byte {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 11px; padding: 2px 4px; border-radius: 4px;
  background: hsla(var(--cw-hue), 70%, 55%, 0.28);
  border: 1px solid transparent;
}
.byte-ec { background: hsla(var(--cw-hue), 22%, 60%, 0.25); color: var(--text-muted); }
.byte-fixed { border-color: var(--danger); color: var(--danger); font-weight: 700; }

.how { margin: 24px 0; color: var(--text-secondary); font-size: 14px; }
.how summary { cursor: pointer; font-weight: 600; color: var(--text-primary); }
.how ol { padding-left: 20px; }

.app-footer { padding: 16px; font-size: 13px; color: var(--text-muted); }
.app-footer a { color: inherit; }