:root {
  --surface: #fcfcfb; --raised: #ffffff; --ink: #0b0b0b; --ink-2: #52514e; --ink-3: #898781;
  --grid: #e1e0d9; --axis: #c3c2b7; --ring: rgba(11,11,11,0.10); --wash: #f3f2ee;
  --A: #2a78d6; --B: #eb6834; --C: #1baf7a;
  --good: #0ca30c; --warning: #fab219; --serious: #ec835a; --critical: #d03b3b;
  --link: #2a78d6;
}
@media (prefers-color-scheme: dark) {
  :root {
    --surface: #1a1a19; --raised: #222220; --ink: #f2f1ec; --ink-2: #b9b8b1; --ink-3: #898781;
    --grid: #2c2c2a; --axis: #383835; --ring: rgba(255,255,255,0.10); --wash: #262624;
    --A: #3987e5; --B: #d95926; --C: #199e70; --link: #6ea8ee;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--surface); color: var(--ink);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
}
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.hero { padding: 56px 0 24px; border-bottom: 1px solid var(--grid); }
.eyebrow { color: var(--ink-3); font-size: 13px; margin: 0 0 8px; }
h1 { font-size: 40px; line-height: 1.15; margin: 0 0 12px; font-weight: 650; letter-spacing: -0.01em; }
.lede { font-size: 18px; color: var(--ink-2); max-width: 780px; margin: 0 0 20px; }
.notice { background: var(--wash); border-left: 3px solid var(--serious); padding: 12px 16px; border-radius: 6px; font-size: 14px; color: var(--ink-2); max-width: 880px; }
.notice strong { color: var(--ink); }
.toc { position: sticky; top: 0; background: var(--surface); z-index: 5; border-bottom: 1px solid var(--grid); font-size: 14px; }
.toc-in { display: flex; gap: 20px; padding-top: 12px; padding-bottom: 12px; overflow-x: auto; white-space: nowrap; scrollbar-width: none; }
.toc a { color: var(--ink-2); }
section { padding: 40px 0 8px; }
h2 { font-size: 26px; margin: 0 0 16px; font-weight: 650; }
h3 { font-size: 17px; margin: 22px 0 8px; font-weight: 600; }
.prose { color: var(--ink-2); max-width: 860px; }
.prose em { font-style: normal; color: var(--ink); font-weight: 600; }
.muted { color: var(--ink-3); }
.small { font-size: 13px; }
.arms { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.arm-card { background: var(--raised); border: 1px solid var(--ring); border-radius: 10px; padding: 16px 18px; position: relative; }
.arm-card h3 { margin: 0 0 6px; display: inline-block; }
.arm-card p { margin: 0; color: var(--ink-2); font-size: 14px; }
.key { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 8px; vertical-align: 1px; }
.key[data-arm=A] { background: var(--A); } .key[data-arm=B] { background: var(--B); } .key[data-arm=C] { background: var(--C); }
.facts { display: flex; gap: 32px; flex-wrap: wrap; margin: 24px 0 8px; }
.facts div { display: flex; flex-direction: column; }
.facts b { font-size: 32px; font-weight: 600; line-height: 1.1; }
.facts span { color: var(--ink-3); font-size: 13px; }
.takeaways { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 16px; margin-bottom: 20px; }
.takeaway { background: var(--raised); border: 1px solid var(--ring); border-radius: 10px; padding: 14px 18px; font-size: 14px; color: var(--ink-2); }
.takeaway h4 { margin: 0 0 6px; font-size: 15px; color: var(--ink); }
.legend { display: flex; gap: 18px; flex-wrap: wrap; font-size: 13px; color: var(--ink-2); margin: 4px 0 12px; }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.legend i { display: inline-block; width: 16px; height: 2px; border-radius: 1px; }
.legend i.dot { width: 9px; height: 9px; border-radius: 50%; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 16px; }
.card { background: var(--raised); border: 1px solid var(--ring); border-radius: 10px; padding: 14px 16px 8px; }
.card h4 { margin: 0; font-size: 14px; font-weight: 600; }
.card .sub { margin: 0 0 6px; font-size: 12px; color: var(--ink-3); }
svg { display: block; width: 100%; height: auto; overflow: visible; }
svg text { fill: var(--ink-3); font-size: 11px; font-variant-numeric: tabular-nums; }
svg text.lab { fill: var(--ink-2); font-size: 12px; }
svg text.val { fill: var(--ink); font-size: 12px; font-weight: 600; }
.gridline { stroke: var(--grid); stroke-width: 1; }
.axis { stroke: var(--axis); stroke-width: 1; }
.thresh { stroke: var(--axis); stroke-width: 1; }
.line { fill: none; stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
.dot { stroke: var(--raised); stroke-width: 2; }
.cross { stroke: var(--ink-3); stroke-width: 1; }
table { border-collapse: collapse; width: 100%; font-size: 13px; font-variant-numeric: tabular-nums; }
th, td { text-align: left; padding: 6px 10px; border-bottom: 1px solid var(--grid); }
th { color: var(--ink-3); font-weight: 500; }
.table-view { margin-top: 14px; }
.table-view summary { cursor: pointer; color: var(--ink-2); font-size: 14px; }
.filters { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; margin-bottom: 16px; }
select { font: inherit; font-size: 14px; padding: 6px 10px; border-radius: 6px; border: 1px solid var(--ring); background: var(--raised); color: var(--ink); }
.seg { display: inline-flex; border: 1px solid var(--ring); border-radius: 8px; overflow: hidden; }
.seg button { font: inherit; font-size: 14px; border: 0; background: var(--raised); color: var(--ink-2); padding: 6px 14px; cursor: pointer; display: inline-flex; align-items: center; gap: 6px; }
.seg button + button { border-left: 1px solid var(--ring); }
.seg button[aria-selected=true] { background: var(--wash); color: var(--ink); font-weight: 600; }
.strip { display: grid; grid-template-columns: 190px 1fr; align-items: center; gap: 10px; margin: 4px 0; font-size: 13px; color: var(--ink-2); }
.cells { display: grid; grid-template-columns: repeat(20, 1fr); gap: 2px; }
.cell { height: 22px; border-radius: 3px; border: 0; padding: 0; cursor: pointer; font-size: 10px; color: #fff; line-height: 22px; text-align: center; }
.cell:focus-visible, .cell:hover { outline: 2px solid var(--ink); outline-offset: 1px; }
.cell[data-ev=preliminary_support] { background: var(--good); }
.cell[data-ev=not_supported] { background: var(--critical); }
.cell[data-ev=inconclusive] { background: var(--grid); color: var(--ink-2); }
.cell[data-ev=implementation_mismatch] { background: var(--warning); color: #0b0b0b; }
.cell[data-ev=none] { background: transparent; border: 1px solid var(--grid); }
.ev { display: inline-flex; align-items: center; gap: 4px; font-size: 12px; padding: 1px 8px; border-radius: 999px; background: var(--wash); color: var(--ink); white-space: nowrap; }
.ev::before { font-weight: 700; }
.ev[data-ev=preliminary_support]::before { content: "✓"; color: var(--good); }
.ev[data-ev=not_supported]::before { content: "✗"; color: var(--critical); }
.ev[data-ev=inconclusive]::before { content: "?"; color: var(--ink-3); }
.ev[data-ev=implementation_mismatch]::before { content: "⚠"; color: #b07a00; }
.ev-legend { display: flex; gap: 10px; flex-wrap: wrap; margin: 8px 0 18px; }
.round { background: var(--raised); border: 1px solid var(--ring); border-radius: 10px; padding: 16px 18px; margin: 12px 0; scroll-margin-top: 64px; }
.round.flash { outline: 2px solid var(--ink-3); }
.round-head { display: flex; gap: 12px; align-items: baseline; flex-wrap: wrap; }
.round-head h4 { margin: 0; font-size: 16px; }
.scores { margin-left: auto; font-size: 13px; color: var(--ink-2); font-variant-numeric: tabular-nums; }
.scores b { color: var(--ink); }
.delta-good { color: #006300; } .delta-bad { color: var(--critical); }
@media (prefers-color-scheme: dark) { .delta-good { color: #0ca30c; } .ev[data-ev=implementation_mismatch]::before { color: var(--warning); } }
.cands { display: grid; gap: 8px; margin: 12px 0; }
.cand { border: 1px solid var(--grid); border-radius: 8px; padding: 8px 12px; font-size: 14px; }
.cand.sel { border-color: var(--ink-3); background: var(--wash); }
.cand .t { font-weight: 600; }
.cand .tag { font-size: 11px; color: var(--ink-3); margin-left: 6px; }
.cand .c { color: var(--ink-2); font-size: 13px; margin-top: 2px; }
.block { font-size: 14px; color: var(--ink-2); margin: 8px 0 0; }
.block b { color: var(--ink); font-weight: 600; }
.prose-list { color: var(--ink-2); max-width: 900px; padding-left: 20px; }
.prose-list li { margin: 6px 0; }
.tooltip { position: fixed; pointer-events: none; z-index: 20; background: var(--raised); border: 1px solid var(--ring); box-shadow: 0 4px 16px rgba(0,0,0,0.12); border-radius: 8px; padding: 8px 10px; font-size: 12px; color: var(--ink-2); min-width: 120px; }
.tooltip .h { color: var(--ink-3); margin-bottom: 4px; }
.tooltip .r { display: flex; align-items: center; gap: 8px; font-variant-numeric: tabular-nums; }
.tooltip .r b { color: var(--ink); font-weight: 600; }
.tooltip .r i { width: 12px; height: 2px; display: inline-block; }
footer { padding: 32px 24px 48px; border-top: 1px solid var(--grid); margin-top: 40px; }


/* ---------- v2 additions ---------- */
section { scroll-margin-top: 52px; }
.tldr { background: var(--raised); border: 1px solid var(--ring); border-radius: 10px; padding: 14px 18px; margin: 18px 0 4px; max-width: 900px; color: var(--ink-2); font-size: 15px; }
.tldr-h { font-weight: 600; color: var(--ink); margin: 0 0 4px; }
.tldr p { margin: 4px 0; }
.question { margin: 14px 0; padding: 12px 18px; border-left: 3px solid var(--A); background: var(--wash); border-radius: 6px; color: var(--ink); max-width: 860px; font-size: 15px; }
.arm-card h4 { margin: 0 0 6px; font-size: 15px; }
.arm-card h4 small { color: var(--ink-3); font-weight: 400; }
.flow { list-style: none; padding: 0; margin: 12px 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 10px; counter-reset: none; max-width: 1080px; }
.step { background: var(--raised); border: 1px solid var(--ring); border-radius: 10px; padding: 10px 14px; font-size: 13px; color: var(--ink-2); display: flex; flex-direction: column; gap: 4px; }
.step b { color: var(--ink); font-size: 14px; }
.step-split { border: 1.5px solid var(--ink-3); background: var(--wash); }
.step-loop { border-style: dashed; }
.armrow { display: flex; align-items: center; gap: 6px; }
.armrow i { width: 9px; height: 9px; border-radius: 50%; display: inline-block; flex: none; }
.armrow i[data-arm=A] { background: var(--A); } .armrow i[data-arm=B] { background: var(--B); } .armrow i[data-arm=C] { background: var(--C); }
.impl { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 12px; margin: 12px 0; }
.impl-item { background: var(--raised); border: 1px solid var(--ring); border-radius: 10px; padding: 12px 16px; }
.impl-item h4 { margin: 0 0 4px; font-size: 15px; }
.impl-item p { margin: 0; font-size: 13.5px; color: var(--ink-2); }
.chart-card { padding: 12px 14px; margin: 6px 0 14px; }
.chart { width: 100%; min-height: 40px; }
.ov-row { cursor: pointer; outline: none; }
.ov-row .row-hl { fill: transparent; }
.ov-row:hover .row-hl, .ov-row:focus-visible .row-hl { fill: var(--wash); }
.baseline { stroke: var(--ink-3); stroke-width: 1; stroke-dasharray: 4 4; }
.legend i.dot.hollow { background: transparent; border: 2px solid var(--ink-3); width: 10px; height: 10px; }
.lg-btn { font: inherit; font-size: 13px; display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--ring); background: var(--raised); color: var(--ink-2); border-radius: 999px; padding: 3px 10px; cursor: pointer; }
.lg-btn[aria-pressed=false] { opacity: 0.45; text-decoration: line-through; }
.lg-mark { width: 14px; height: 14px; display: inline-block; }
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; border: 1px solid var(--ring); border-radius: 10px; background: var(--raised); margin: 8px 0 16px; }
.table-wrap table { min-width: 760px; }
.num { text-align: right; white-space: nowrap; }
th.num { text-align: right; }
.ov-table tr.grp > * { border-top: 2px solid var(--grid); }
.ov-table tr.click { cursor: pointer; }
.ov-table tr.click:hover td, .ov-table tr.click:focus-visible td { background: var(--wash); }
.task-cell { color: var(--ink); font-weight: 600; vertical-align: top; min-width: 150px; }
.task-cell small { display: block; color: var(--ink-3); font-weight: 400; font-size: 12px; }
.arm-cell { white-space: nowrap; font-weight: 600; }
td i.dot, th i.dot, h4 i.dot, button i.dot { display: inline-block; width: 9px; height: 9px; border-radius: 50%; margin-right: 6px; vertical-align: 0; }
.chip { display: inline-block; font-size: 11.5px; padding: 1px 8px; border-radius: 999px; background: var(--wash); color: var(--ink-2); white-space: nowrap; font-weight: 500; }
.chip.run { background: transparent; border: 1px dashed var(--serious); color: var(--ink); }
.chip.ghost { background: transparent; border: 1px solid var(--grid); }
.chip.sel { background: var(--ink); color: var(--surface); }
small.chip { display: inline-block; margin-top: 4px; }
.task-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 12px; margin: 12px 0 20px; }
.task-card { font: inherit; text-align: left; background: var(--raised); border: 1px solid var(--ring); border-radius: 10px; padding: 12px 14px; cursor: pointer; display: flex; flex-direction: column; gap: 4px; color: var(--ink-2); }
.task-card:hover, .task-card:focus-visible { border-color: var(--ink-3); }
.task-card[aria-current=true] { border-color: var(--ink); box-shadow: 0 0 0 1px var(--ink); }
.task-card b { color: var(--ink); font-size: 15px; }
.tc-top { display: flex; gap: 6px; flex-wrap: wrap; }
.tc-short { font-size: 13px; }
.tc-metric { font-size: 12px; color: var(--ink-3); }
.task-detail { background: var(--raised); border: 1px solid var(--ring); border-radius: 12px; padding: 18px 20px; scroll-margin-top: 56px; }
.td-head { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; align-items: flex-start; }
.td-title { margin: 0; font-size: 22px; }
.task-info { display: grid; grid-template-columns: 110px 1fr; gap: 6px 14px; margin: 14px 0; font-size: 14px; max-width: 980px; }
.task-info dt { color: var(--ink-3); }
.task-info dd { margin: 0; color: var(--ink-2); }
.sub-h { margin: 22px 0 8px; font-size: 16px; }
.final-card { padding: 12px 14px; }
.mini-table { max-width: 520px; }
.round-detail { border: 1px dashed var(--grid); border-radius: 10px; padding: 12px 16px; margin: 4px 0 8px; scroll-margin-top: 56px; }
.round-detail.open { border: 1px solid var(--ink-3); background: var(--surface); }
.rd-head { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; align-items: center; }
.rd-head h4 { margin: 0; font-size: 16px; }
.rd-nav { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.rd-nav > button { font: inherit; font-size: 13px; border: 1px solid var(--ring); background: var(--raised); color: var(--ink-2); border-radius: 8px; padding: 5px 10px; cursor: pointer; }
button:disabled { opacity: 0.4; cursor: default; }
.rd-scores { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 8px; margin: 12px 0; }
.rd-scores > div { background: var(--raised); border: 1px solid var(--ring); border-radius: 8px; padding: 8px 10px; display: flex; flex-direction: column; gap: 2px; font-variant-numeric: tabular-nums; }
.rd-scores span { font-size: 12px; color: var(--ink-3); }
.rd-scores b { font-size: 16px; color: var(--ink); }
.rd-scores b.delta-good { color: #006300; } .rd-scores b.delta-bad { color: var(--critical); }
.round-detail h5 { margin: 14px 0 4px; font-size: 14px; }
.cands { list-style: none; padding: 0; }
.cand { background: var(--raised); }
.cand-h { display: flex; gap: 8px; align-items: center; margin-bottom: 2px; flex-wrap: wrap; }
.cand-n { font-size: 12px; color: var(--ink-3); }
.cand.sel { border: 1.5px solid var(--ink); }
.cand details summary { cursor: pointer; font-size: 12px; color: var(--ink-3); margin-top: 4px; }
.block p { margin: 2px 0 0; white-space: pre-wrap; }
.block.critique { border-left: 3px solid var(--C); padding-left: 10px; }
.round-table { min-width: 720px; }
.round-table td { padding: 3px 4px; vertical-align: top; width: 32%; }
.round-table th[scope=row] { text-align: center; width: 40px; }
.rt-cell { font: inherit; width: 100%; text-align: left; border: 1px solid transparent; background: transparent; border-radius: 6px; padding: 4px 6px; cursor: pointer; color: var(--ink-2); display: flex; flex-direction: column; gap: 2px; }
.rt-cell:hover, .rt-cell:focus-visible { background: var(--wash); }
.rt-cell[aria-current=true] { border-color: var(--ink); background: var(--wash); }
.rt-top { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; font-size: 12px; font-variant-numeric: tabular-nums; }
.rt-title { font-size: 12px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.doc { max-width: 900px; }
.doc h3:first-child { margin-top: 8px; }
.notice.placeholder { border-left-color: var(--warning); margin-bottom: 12px; }
.tooltip { max-width: min(420px, 92vw); }
.tooltip .r { align-items: baseline; }
.tooltip .r i { width: 9px; height: 9px; border-radius: 50%; flex: none; align-self: center; }
.tooltip .r span { color: var(--ink-3); }
@media (prefers-color-scheme: dark) { .rd-scores b.delta-good { color: #0ca30c; } }
@media (max-width: 640px) {
  .wrap { padding: 0 16px; }
  h1 { font-size: 30px; } h2 { font-size: 22px; }
  .facts { gap: 18px; } .facts b { font-size: 24px; }
  .task-info { grid-template-columns: 1fr; gap: 2px; } .task-info dd { margin-bottom: 8px; }
  .task-detail { padding: 14px 12px; }
  .rd-nav { width: 100%; justify-content: space-between; }
}