/* Config builder page: dark, responsive (form left, sticky preview right; stacks on narrow screens). */
:root {
  color-scheme: dark;
  --bg: #0d0e12;
  --panel: #15171d;
  --panel-2: #1b1e26;
  --field: #0f1116;
  --border: #272b36;
  --border-strong: #3a3f4d;
  --text: #e9eaf0;
  --muted: #9ba1b0;
  --accent: #9147ff;
  --accent-hi: #a970ff;
  --accent-soft: rgba(145, 71, 255, .16);
  --focus: #c3a1ff;
  --ok: #45d49a;
  --warn: #f3bd4f;
  --err: #ff6b7a;
  --radius: 12px;
  --radius-sm: 8px;
  --font-ui: 'Inter', system-ui, 'Segoe UI', Roboto, Arial, sans-serif;
  --mono: 'Cascadia Mono', Consolas, 'SFMono-Regular', Menlo, 'Courier New', monospace;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 var(--font-ui);
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { margin: 0; line-height: 1.25; }
a { color: var(--accent-hi); }
code { font-family: var(--mono); font-size: .9em; }
b { font-weight: 600; }
[hidden] { display: none !important; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}
.skip {
  position: absolute; left: 16px; top: -48px; z-index: 10;
  background: var(--accent); color: #fff; padding: 8px 14px; border-radius: var(--radius-sm);
  text-decoration: none; font-weight: 600;
}
.skip:focus { top: 12px; }

:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
input:focus-visible, button:focus-visible, a:focus-visible, summary:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }

/* ---------- layout ---------- */
.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas: "top" "preview" "settings";
  gap: 16px;
  padding: 16px;
  max-width: 1600px;
  margin: 0 auto;
}
.top { grid-area: top; display: flex; flex-direction: column; gap: 16px; min-width: 0; }
.preview { grid-area: preview; min-width: 0; }
.settings { grid-area: settings; display: flex; flex-direction: column; gap: 16px; min-width: 0; outline: none; }

@media (min-width: 1000px) {
  .layout {
    grid-template-columns: minmax(0, 1fr) minmax(380px, 46%);
    grid-template-areas: "top preview" "settings preview";
    grid-template-rows: auto 1fr;
    align-items: start;
    gap: 20px;
    padding: 20px;
  }
  .preview {
    position: -webkit-sticky;
    position: sticky;
    top: 20px;
    height: calc(100vh - 40px);
    min-height: 480px;
  }
}

/* layout=horizontal in a landscape source: the preview gets its own full-width row above the settings
   instead of the tall side column. builder.js sizes the stage to the source's shape (150px and up) and
   adds .pin-preview, which keeps the row in view while scrolling, only when it is short for the window. */
.layout.wide-preview .preview { height: auto; min-height: 0; }
.layout.wide-preview .stage { flex: none; height: 150px; }
@media (min-width: 1000px) {
  .layout.wide-preview {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: "top" "preview" "settings";
    grid-template-rows: auto;
  }
  .layout.wide-preview .preview { position: static; }
  .layout.wide-preview.pin-preview .preview {
    position: -webkit-sticky;
    position: sticky;
    top: 0;
    z-index: 5;
  }
}

/* ---------- cards / groups ---------- */
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
}
.brand { padding: 4px 2px 0; }
.brand h1 { font-size: 26px; font-weight: 800; letter-spacing: -.01em; }
.brand h1::before {
  content: ""; display: inline-block; width: 12px; height: 12px; margin-right: 10px;
  border-radius: 3px; background: var(--accent); vertical-align: 3px;
  box-shadow: 0 0 0 4px var(--accent-soft);
}
.lede { color: var(--muted); margin: 8px 0 0; max-width: 64ch; }

#channel-card h2, .obs h2 { font-size: 18px; margin-bottom: 12px; }

.settings-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 4px 2px 0; }
.settings-head h2 { font-size: 20px; }

details.group { padding: 0; }
details.group > summary {
  list-style: none;
  cursor: pointer;
  padding: 16px 18px;
  display: flex; align-items: center; justify-content: space-between;
  border-radius: var(--radius);
}
details.group > summary::-webkit-details-marker { display: none; }
details.group > summary h2 { font-size: 17px; font-weight: 700; }
details.group > summary::after {
  content: ""; width: 8px; height: 8px; margin-right: 4px;
  border-right: 2px solid var(--muted); border-bottom: 2px solid var(--muted);
  transform: rotate(45deg); transition: transform .15s ease;
}
details.group[open] > summary::after { transform: rotate(-135deg); }
details.group > summary:hover h2 { color: #fff; }
.group-body {
  padding: 2px 18px 18px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px 22px;
  align-items: start;
}

.note {
  grid-column: 1 / -1;
  margin: 0;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: var(--panel-2);
  color: var(--muted);
  font-size: 13px;
}

/* ---------- fields ---------- */
.field { min-width: 0; }
.field-text { grid-column: 1 / -1; }
.field-label {
  display: block;
  font-weight: 600;
  font-size: 14px;
  margin-bottom: 6px;
}
.help { color: var(--muted); font-size: 13px; margin: 6px 0 0; }
.field .help { max-width: 60ch; }

.text, .num {
  width: 100%;
  background: var(--field);
  color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 9px 11px;
  font: inherit;
  font-size: 15px;
  min-height: 40px;
}
.num { max-width: 140px; }
.text::placeholder { color: #6b7180; }
.text:hover, .num:hover { border-color: #4a5060; }
.text:focus, .num:focus { border-color: var(--accent); outline: none; box-shadow: 0 0 0 3px var(--accent-soft); }
.text[aria-invalid="true"] { border-color: var(--err); }
.mono { font-family: var(--mono); font-size: 13px; }

.input-row { display: flex; gap: 8px; }
.input-row .text { flex: 1 1 auto; min-width: 0; }

/* checkbox rows */
.check {
  display: flex; align-items: flex-start; gap: 10px;
  cursor: pointer;
  font-weight: 600; font-size: 14px;
  padding-top: 2px;
}
.check input { flex: none; width: 18px; height: 18px; margin: 1px 0 0; accent-color: var(--accent); cursor: pointer; }
.field-check .help { margin-left: 28px; }
.field.disabled { opacity: .45; }
.field.disabled .check { cursor: not-allowed; }

.subgrid {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 10px 22px;
  margin: -4px 0 0 0;
  padding: 12px 14px;
  border-left: 2px solid var(--border-strong);
  background: rgba(255, 255, 255, .015);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.subgrid .check { font-weight: 500; }

/* range */
.range-head { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
.range-head .field-label { margin-bottom: 4px; }
.range-value { color: var(--accent-hi); font-weight: 700; font-size: 14px; font-variant-numeric: tabular-nums; }
input[type="range"] { width: 100%; accent-color: var(--accent); margin: 4px 0 0; height: 22px; cursor: pointer; }

/* segmented radios */
.seg-field { border: 0; margin: 0; padding: 0; min-width: 0; }
.seg-field legend { padding: 0; }
.seg {
  display: inline-flex; flex-wrap: wrap;
  background: var(--field);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 3px;
  gap: 3px;
}
.seg label { position: relative; cursor: pointer; }
.seg input { position: absolute; opacity: 0; width: 1px; height: 1px; margin: 0; }
.seg span {
  display: block;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 14px; font-weight: 600;
  color: var(--muted);
  white-space: nowrap;
}
.seg label:hover span { color: var(--text); }
.seg input:checked + span { background: var(--accent); color: #fff; }
.seg input:focus-visible + span { outline: 2px solid var(--focus); outline-offset: 1px; }
.seg-small span { padding: 5px 10px; font-size: 13px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 40px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--panel-2);
  color: var(--text);
  font: inherit; font-size: 14px; font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color .12s ease, border-color .12s ease;
}
.btn:hover { background: #242835; border-color: #4a5060; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-hi); border-color: var(--accent-hi); }
.btn.ghost { background: transparent; }
.btn.flash { background: #1f6e4f; border-color: #2c8a64; color: #fff; }
.btns { display: flex; flex-wrap: wrap; gap: 8px; }

/* ---------- status lines ---------- */
.status { font-size: 13px; margin: 8px 0 0; color: var(--muted); display: flex; align-items: center; gap: 8px; min-height: 0; }
.status:empty { display: none; }
.status.ok { color: var(--ok); }
.status.warn { color: var(--warn); }
.status.err { color: var(--err); }
.status.busy { color: var(--muted); }
.status.busy::before {
  content: ""; width: 12px; height: 12px; flex: none;
  border: 2px solid var(--border-strong); border-top-color: var(--accent-hi);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
.status strong { color: var(--text); }
.status.small { font-size: 12px; margin-top: 6px; }
.avatar { width: 28px; height: 28px; border-radius: 50%; flex: none; background: var(--panel-2); }
@keyframes spin { to { transform: rotate(360deg); } }

details.paste { margin-top: 14px; border-top: 1px solid var(--border); padding-top: 12px; }
details.paste > summary { cursor: pointer; color: var(--muted); font-weight: 600; font-size: 14px; width: max-content; max-width: 100%; }
details.paste > summary:hover { color: var(--text); }
details.paste[open] > summary { margin-bottom: 10px; }
details.paste .input-row { align-items: flex-start; }
/* One line like the other inputs, but a textarea so a pasted settings.js keeps its line breaks. Drag to see more. */
.paste-text {
  display: block;
  height: 40px;
  max-height: 50vh;
  line-height: 20px;
  white-space: pre;
  overflow-x: hidden;
  overflow-y: auto;
  resize: vertical;
}

/* ---------- preview ---------- */
.preview {
  display: flex; flex-direction: column; gap: 12px;
  padding: 12px;
  height: min(78vh, 760px);
  min-height: 420px;
}
.preview-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px; }
.swatches { display: flex; gap: 6px; }
.swatches label { position: relative; cursor: pointer; display: block; }
.swatches input { position: absolute; opacity: 0; width: 1px; height: 1px; margin: 0; }
.sw {
  display: block; width: 30px; height: 30px;
  border-radius: 7px;
  border: 2px solid var(--border-strong);
  background-size: auto;
}
.swatches input:checked + .sw { border-color: var(--accent-hi); box-shadow: 0 0 0 2px var(--accent-soft); }
.swatches input:focus-visible + .sw { outline: 2px solid var(--focus); outline-offset: 2px; }
.sw.bd-checker { background-size: 10px 10px; background-position: 0 0, 0 5px, 5px -5px, -5px 0; }

.size { display: flex; align-items: center; gap: 6px; margin-left: auto; color: var(--muted); font-size: 13px; }
.size .num { width: 76px; min-height: 34px; padding: 5px 8px; font-size: 14px; }
.size-label { font-weight: 600; }

.stage {
  position: relative;
  flex: 1 1 auto;
  min-height: 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  display: flex; align-items: center; justify-content: center;
  padding: 14px;
  border: 1px solid var(--border);
}
.frame-box {
  position: relative;
  flex: none;
  overflow: hidden;
  outline: 1px dashed rgba(255, 255, 255, .35);
  outline-offset: 0;
}
.bd-light .frame-box, .bd-checker .frame-box { outline-color: rgba(0, 0, 0, .4); }
.bd-busy .frame-box { outline: 2px dashed rgba(0, 0, 0, .55); }
.preview-frame {
  display: block;
  border: 0;
  background: transparent;
  /* Must match the overlay document's scheme, or Chromium paints the iframe opaque. */
  color-scheme: normal;
  transform-origin: 0 0;
}
.stage-hint {
  position: absolute; top: 12px; left: 50%; z-index: 2;
  transform: translateX(-50%);
  width: max-content; max-width: calc(100% - 24px);
  margin: 0;
  padding: 7px 12px;
  border-radius: 999px;
  background: rgba(13, 14, 18, .82);
  border: 1px solid rgba(255, 255, 255, .12);
  color: #e9eaf0;
  font-size: 13px; text-align: center;
  pointer-events: none;
}
.scale-note {
  position: absolute; right: 8px; bottom: 6px; margin: 0;
  padding: 2px 8px; border-radius: 6px;
  background: rgba(13, 14, 18, .7);
  color: #c9ccd6; font-size: 11px; font-variant-numeric: tabular-nums;
  pointer-events: none;
}

.urlbar { display: flex; gap: 8px; }
.urlbar .text { flex: 1 1 auto; min-width: 0; }
#bar-warn { margin-top: -4px; }

/* ---------- backdrops (CSS only, no images) ---------- */
.bd-dark {
  background:
    radial-gradient(ellipse at 20% 10%, rgba(145, 71, 255, .22), transparent 55%),
    radial-gradient(ellipse at 90% 90%, rgba(40, 120, 255, .16), transparent 50%),
    linear-gradient(160deg, #1b1d27 0%, #0e0f15 100%);
}
.bd-light { background: linear-gradient(160deg, #f4f5f9 0%, #dfe3ec 100%); }
.bd-checker {
  background-color: #fff;
  background-image:
    linear-gradient(45deg, #c9ccd3 25%, transparent 25%),
    linear-gradient(-45deg, #c9ccd3 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #c9ccd3 75%),
    linear-gradient(-45deg, transparent 75%, #c9ccd3 75%);
  background-size: 24px 24px;
  background-position: 0 0, 0 12px, 12px -12px, -12px 0;
}
.bd-busy {
  background:
    radial-gradient(circle at 18% 22%, rgba(255, 244, 170, .95) 0 5%, transparent 5.5%),
    radial-gradient(circle at 72% 64%, rgba(255, 255, 255, .9) 0 3%, transparent 3.5%),
    radial-gradient(circle at 40% 80%, rgba(255, 90, 60, .85) 0 7%, transparent 7.5%),
    radial-gradient(ellipse at 85% 18%, rgba(120, 220, 255, .9) 0 10%, transparent 11%),
    repeating-linear-gradient(115deg, rgba(255, 255, 255, .22) 0 10px, transparent 10px 34px),
    repeating-linear-gradient(25deg, rgba(0, 0, 0, .18) 0 6px, transparent 6px 22px),
    linear-gradient(170deg, #5ec3ff 0%, #bfe8ff 28%, #f7e08a 42%, #7fcf5a 55%, #3c9a3f 72%, #7a5a33 100%);
}

/* ---------- OBS section ---------- */
.obs { display: flex; flex-direction: column; gap: 18px; }
.obs h2 { margin-bottom: 0; }
.obs-block { display: flex; flex-direction: column; gap: 10px; }
.obs-block + .obs-block { border-top: 1px solid var(--border); padding-top: 18px; }
.obs-block h3 { font-size: 15px; font-weight: 700; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.obs-block .help { margin: 0; }
.tag {
  font-size: 11px; font-weight: 700; letter-spacing: .04em; text-transform: uppercase;
  color: var(--accent-hi); background: var(--accent-soft);
  padding: 2px 8px; border-radius: 999px;
}
.url-out { display: flex; flex-direction: column; gap: 10px; }
.code-line, .code-block {
  display: block;
  margin: 0;
  background: var(--field);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-family: var(--mono);
  font-size: 13px;
  color: #d8dbe6;
}
.code-line { word-break: break-all; }
.code-block { overflow: auto; max-height: 320px; white-space: pre; }
.code-block code { font-size: inherit; }
.steps { margin: 4px 0 0; padding-left: 22px; display: flex; flex-direction: column; gap: 6px; }
.steps li { padding-left: 2px; }
.steps li::marker { color: var(--accent-hi); font-weight: 700; }
.callout {
  background: var(--accent-soft);
  border: 1px solid rgba(145, 71, 255, .4);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
}
.callout p { margin: 0; }
.callout .status { margin-top: 6px; }

.foot { color: var(--muted); font-size: 13px; padding: 0 2px 8px; }
.foot p { margin: 0; }

/* ---------- small screens ---------- */
@media (max-width: 560px) {
  .layout { padding: 12px 16px; gap: 12px; }
  .card { padding: 14px; }
  details.group > summary { padding: 14px; }
  .group-body { padding: 2px 14px 14px; grid-template-columns: minmax(0, 1fr); }
  .brand h1 { font-size: 22px; }
  .preview { height: 72vh; min-height: 380px; padding: 10px; }
  .size { margin-left: 0; }
  .urlbar { flex-wrap: wrap; }
  .urlbar .text { flex-basis: 100%; }
  .urlbar .btn { flex: 1 1 auto; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation-duration: .01ms !important; }
}