body.lab { display: block; height: auto; min-height: 100%; }
.bar-link { color: var(--muted); font-size: 12px; }

.knobs { display: flex; flex-wrap: wrap; gap: 12px 24px; padding: 16px; border-bottom: 1px solid var(--line); }
.knobs fieldset { border: 0; margin: 0; padding: 0; display: flex; align-items: center; gap: 8px; }
.knobs legend { float: left; font-size: 12px; color: var(--muted); margin-right: 4px; }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.seg label { position: relative; padding: 6px 10px; font-size: 13px; cursor: pointer; }
.seg label + label { border-left: 1px solid var(--line); }
.seg input { position: absolute; opacity: 0; inset: 0; cursor: pointer; }
.seg label:has(input:checked) { background: var(--text); color: var(--bg); }
.seg label:has(input:focus-visible) { outline: 2px solid var(--accent); outline-offset: -2px; }
.knobs .reset { margin-left: auto; }

.tabs { display: flex; gap: 8px; padding: 16px 16px 0; flex-wrap: wrap; }
.tabs button { padding: 10px 16px; font-size: 15px; }
.tabs button[aria-pressed="true"] { background: var(--text); color: var(--bg); border-color: var(--text); }

.uc-head { padding: 16px; display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; }
.uc-head div { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; }
.uc-head span { display: block; font-size: 12px; color: var(--muted); margin-bottom: 2px; }
.uc-head a { color: var(--text); font-weight: 600; }

.board { list-style: none; margin: 0; padding: 0 16px 48px; display: flex; flex-direction: column; gap: 20px; }
.step { display: flex; gap: 20px; align-items: flex-start; flex-wrap: wrap; }
.frames { display: flex; gap: 12px; flex-wrap: wrap; }
/* 按物理尺寸对齐：480 px ≈ 73.4 mm（3.5″），所以 320×240 的 2.8″ 屏放大 1.175 倍，两种屏并排时大小关系是真实的 */
.frame { --z: 1; zoom: var(--z); }
.frame:has(.screen[data-size="s"]) { --z: 1.175; }
.frames.compare .frame { --z: 0.62; }
.frames.compare .frame:has(.screen[data-size="s"]) { --z: 0.73; }
.frame .screen { position: relative; left: 0; top: 0; }
.frame figcaption { font-size: 12px; color: var(--muted); margin-top: 6px; text-align: center; }
.notes { flex: 1; min-width: 240px; }
.notes .t { font: 12px/1.4 ui-monospace, Menlo, monospace; color: var(--muted); }
.notes h3 { margin: 4px 0 6px; font-size: 16px; }
.notes .body-move { font-size: 13px; color: #c3ccd7; }
.notes .press { display: inline-block; margin-top: 6px; font-size: 12px; color: var(--accent); }
.notes details { margin-top: 8px; font-size: 12px; color: var(--muted); }
.notes pre { white-space: pre-wrap; word-break: break-all; background: var(--panel); padding: 8px; border-radius: 6px; }

@media (max-width: 560px) {
  .frame, .frame:has(.screen[data-size="s"]) { --z: 0.68; }
  .frames.compare .frame, .frames.compare .frame:has(.screen[data-size="s"]) { --z: 0.68; }
}

/* 折叠的旋钮面板 */
.knobs-wrap { border-bottom: 1px solid var(--line); }
.knobs-wrap > summary { padding: 12px 16px; cursor: pointer; list-style: none; font: 500 11px/1 var(--mono); letter-spacing: .6px; text-transform: uppercase; color: var(--muted); }
.knobs-wrap > summary::after { content: " −"; }
.knobs-wrap:not([open]) > summary::after { content: " +"; }
.knobs-wrap > summary small { text-transform: none; letter-spacing: 0; color: var(--faint); margin-left: 6px; }
.knobs-wrap .knobs { border-bottom: 0; padding-top: 4px; }

@media (max-width: 560px) {
  .bar { padding: 10px 16px; }
  .bar .brand span { display: none; }
  .bar-link { white-space: nowrap; }
  .knobs { gap: 12px; }
  .knobs fieldset { flex-direction: column; align-items: flex-start; gap: 6px; width: 100%; min-width: 0; }   /* fieldset 默认不肯比内容窄，会把页面撑宽 */
  .knobs legend { float: none; margin: 0; }
  .seg { max-width: 100%; overflow-x: auto; }   /* 并排对比有 8 个选项，一排放不下就横向滑动 */
  .seg label { white-space: nowrap; padding: 9px 12px; }
  .knobs .reset { margin-left: 0; }
  .tabs { flex-wrap: nowrap; overflow-x: auto; padding-bottom: 4px; }   /* 三个场景一行排开，放不下就横向滑 */
  .tabs button { flex: none; white-space: nowrap; min-height: 44px; }
  .uc-head { grid-template-columns: 1fr; }
}