/* walkthrough-specific layout tokens; the shared palette lives in tokens.css */
:root{
--cell:54px;--radius:0;--shell-h:0px;--gutter:clamp(16px,4vw,40px);
}
body{background:var(--bg);color:var(--ink);font-family:var(--sans);line-height:1.5;font-size:15px}
h1,.recap h2{font-family:var(--serif)}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
header{padding:12px 24px 18px;border-bottom:1px solid var(--line);background:var(--panel);position:sticky;top:0;z-index:5}
.topbar{display:flex;justify-content:space-between;align-items:flex-start;gap:16px}
.hdr-main{min-width:0}
header .hdr-title{font-size:21px;font-weight:700;margin:0;letter-spacing:.01em;line-height:1;}
.topbar-actions{display:flex;align-items:center;gap:10px;flex-shrink:0}
.step-counter{font-size:13px;color:var(--muted);font-variant-numeric:tabular-nums;min-width:5.5em;text-align:right}
header .badges{margin-top:6px;display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.badge{display:inline-flex;align-items:center;gap:5px;padding:3px 10px;border-radius:0;font-size:12px;font-weight:600;border:none;background:var(--soft)}
.badge.diff{color:var(--accent);background:color-mix(in srgb,var(--accent) 8%,transparent)}
.badge.ok{color:var(--place);background:color-mix(in srgb,var(--place) 9%,transparent)}
.badge.warn{color:var(--elim);background:color-mix(in srgb,var(--elim) 9%,transparent)}
.histo{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.solution-meta{padding:10px var(--gutter) 14px;background:var(--panel);border-bottom:1px solid var(--line)}
.solution-meta .meta-head{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;flex-wrap:wrap}
.solution-meta .badges{margin-top:6px}
.solution-meta .histo{margin-top:6px}
.layout{display:grid;grid-template-columns:var(--col1,420px) var(--steps-w,260px) minmax(320px,1fr);gap:20px;padding:16px var(--gutter);height:calc(100vh - var(--shell-h,0px))}
.board-pane{display:flex;flex-direction:column;gap:14px;background:var(--panel);border:none;border-radius:0;padding:16px;width:100%;min-width:0;min-height:0;overflow-y:auto;overflow-x:auto;box-shadow:0 1px 0 rgba(42,37,32,.03)}
.legend{display:flex;flex-wrap:wrap;gap:10px;font-size:11px;color:var(--muted)}
.legend span{display:inline-flex;align-items:center;gap:4px}
.legend i{width:11px;height:11px;border-radius:0;display:inline-block;border:1px solid var(--line2)}
.sparkline{width:100%;height:54px;display:block}
.sparkline circle{cursor:pointer}
.sparkline .guide{stroke:var(--accent);stroke-width:1;stroke-dasharray:2 2;opacity:.45}
.toolbar{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.toolbar-toggles{margin-left:auto;display:flex;gap:8px}
button{font-family:var(--sans);font-size:14px;font-weight:600;cursor:pointer;padding:5px 12px;border:none;border-radius:0;background:transparent;color:var(--ink)}
button:hover{background:var(--soft)}
button.primary{background:var(--accent);color:var(--accent-ink)}
button.primary:hover{background:var(--accent-hi)}
.segmented{display:inline-flex;border:none;border-radius:0;overflow:hidden;background:var(--soft);padding:2px}
.segmented .seg{font-family:var(--sans);font-size:13px;font-weight:600;padding:5px 12px;border:none;border-radius:0;background:transparent;color:var(--muted);cursor:pointer}
.segmented .seg:hover{background:color-mix(in srgb,var(--accent) 10%,transparent);color:var(--ink)}
.segmented .seg.seg-active{background:var(--accent);color:var(--accent-ink)}
.segmented .seg.seg-active:hover{background:var(--accent-hi)}
.inspector{font-size:12px;color:var(--muted);min-height:3.6em;width:100%;overflow-x:hidden;overflow-wrap:anywhere;word-break:break-word;border-top:1px dashed var(--line);padding-top:8px}
.inspector b{color:var(--ink)}
.steps-pane{display:flex;flex-direction:column;background:var(--panel);border:none;border-radius:0;min-height:0;box-shadow:0 1px 0 rgba(42,37,32,.03)}
.steps{list-style:none;margin:0;padding:0;flex:1;min-height:0;overflow-y:auto}
.steps-head{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:8px 12px;border-bottom:1px solid var(--line);flex:0 0 auto}
.steps-title{font-size:12px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}
.steps-collapse{font-size:11px;line-height:1;padding:3px 7px;border:none;border-radius:0;background:transparent;color:var(--muted);cursor:pointer}
.steps-collapse:hover{background:var(--soft);color:var(--accent)}
.step{display:flex;align-items:baseline;gap:8px;padding:7px 12px;border-bottom:1px solid var(--line);cursor:pointer}
.step:hover{background:var(--soft)}
.step.active{background:color-mix(in srgb,var(--accent) 10%,transparent)}
.step-num{font-size:12px;font-weight:700;color:var(--muted);min-width:22px;font-variant-numeric:tabular-nums}
.step .summary{font-size:13px;color:var(--ink);flex:1}
.step .layer{font-size:11px;color:var(--muted);font-style:italic}
.substeps{list-style:none;margin:0;padding:0}
.substep{display:flex;align-items:baseline;gap:7px;padding:5px 12px 5px 22px;border-bottom:1px solid var(--line);cursor:pointer}
.substep:hover{background:var(--soft)}
.substep.active{background:color-mix(in srgb,var(--accent) 10%,transparent)}
.sub-num{font-size:11px;font-weight:700;color:var(--muted);min-width:28px;font-variant-numeric:tabular-nums}
.substep .summary{font-size:12px;color:var(--ink);flex:1}
/* Collapsed rail: a thin number-only strip. Summaries/layers hide; the step
   number and each n.s sub-step label stack vertically. */
.steps-pane.collapsed .steps-head{padding:6px 0;justify-content:center}
.steps-pane.collapsed .steps-title{display:none}
.steps-pane.collapsed .step{padding:3px 0;justify-content:center}
.steps-pane.collapsed .step>.summary,.steps-pane.collapsed .step>.layer{display:none}
.steps-pane.collapsed .substep{padding:2px 0;justify-content:center}
.steps-pane.collapsed .substep>.summary{display:none}
.steps-pane.collapsed .step-num,.steps-pane.collapsed .sub-num{font-size:11px;min-width:0;font-weight:700}
.detail-pane{min-height:0;overflow-y:auto;background:var(--panel);border:none;border-radius:0;box-shadow:0 1px 0 rgba(42,37,32,.03)}
.detail{padding:16px}
.detail h2{margin:0 0 4px;font-size:18px;font-weight:700}
.detail h2 .chip.subtech{font-weight:600;background:transparent;color:var(--muted);border:1px solid var(--line)}
.detail .meta{color:var(--muted);font-size:12px;margin-bottom:10px}
.detail .principle{font-style:italic;color:var(--muted);margin:8px 0}
.detail h4{margin:14px 0 4px;font-size:13px;color:var(--muted)}
.detail ul{margin:4px 0;padding-left:18px}
.detail .evcell{cursor:pointer;border-bottom:1px dotted var(--accent)}
.detail .trial-box{border:none;border-radius:0;background:var(--soft);padding:8px 12px;margin-top:8px}
.detail .outcome{font-weight:700}
.detail .outcome.bad{color:var(--elim)}
.detail .outcome.good{color:var(--place)}
details{margin-top:4px}
summary{cursor:pointer;font-size:13px;color:var(--muted);font-style:italic}
.recap{background:var(--panel);border:none;border-radius:0;padding:8px 24px 24px;margin:0 var(--gutter) 24px;box-shadow:0 1px 0 rgba(42,37,32,.03)}
.recap h2{font-size:19px;font-weight:700}
.recap-family{margin-top:16px}
.recap-family h3{font-size:14px;color:var(--accent);border-bottom:1px solid var(--line);padding-bottom:4px}
.recap-entry{display:flex;align-items:baseline;flex-wrap:wrap;gap:8px;padding:6px 0;border-bottom:1px dashed var(--line)}
.recap-entry .recap-diff{font-size:11px;color:var(--muted);font-style:italic;white-space:nowrap}
.recap-entry .recap-principle{font-size:13px;color:var(--muted);flex:1;min-width:200px}
footer{padding:16px 24px;color:var(--muted);font-size:12px;border-top:1px solid var(--line)}
footer code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
@media (max-width:1100px){
.layout{height:auto;grid-template-columns:var(--steps-w,200px) minmax(0,1fr);grid-template-areas:"board board" "steps detail";align-items:start}
.board-pane{grid-area:board;overflow-y:visible;overflow-x:auto;min-height:0}
.steps-pane{grid-area:steps;min-height:0;overflow:visible}
.steps{flex:none;max-height:none;overflow:visible}
.detail-pane{grid-area:detail;min-height:0;overflow:visible}
}