/* ------------------------------------------------------------ tokens */
:root {
  color-scheme: light;
  --bg: #f1f4f1;
  --surface: #ffffff;
  --surface-2: #e7ece7;
  --surface-3: #dde4de;
  --ink: #16201c;
  --ink-2: #44524c;
  --muted: #69776f;
  --line: #d2dad3;
  --accent: #1f5c4d;
  --accent-ink: #ffffff;
  --accent-soft: #d8e9e2;
  --dense: #0a7fa3;
  --dense-soft: #d3eaf2;
  --sparse: #c47a00;
  --sparse-soft: #f6e6c8;
  --good: #2b7a4b;
  --good-soft: #dcefe2;
  --warn: #8f6200;
  --warn-soft: #f7ebcc;
  --bad: #b3261e;
  --bad-soft: #f8dcd9;
  --dot: #a9b6ae;
  --code-bg: #eef2ee;
  --shadow: 0 1px 2px rgb(22 32 28 / 6%), 0 4px 16px rgb(22 32 28 / 6%);

  --f-display: "Bricolage Grotesque", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  --f-body: "Public Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  --s-1: 4px; --s-2: 8px; --s-3: 12px; --s-4: 16px; --s-5: 24px; --s-6: 32px; --s-7: 48px;
  --r: 8px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #0e1412; --surface: #151d1a; --surface-2: #1d2723; --surface-3: #25312c;
    --ink: #e2e9e5; --ink-2: #b3c0b9; --muted: #8b9992; --line: #2a3632;
    --accent: #72c4a8; --accent-ink: #0e1412; --accent-soft: #1f3a32;
    --dense: #1d9bb8; --dense-soft: #133a45; --sparse: #c98500; --sparse-soft: #3d2d10;
    --good: #62c08a; --good-soft: #17352a; --warn: #e0ad4a; --warn-soft: #3a2e12;
    --bad: #f0827a; --bad-soft: #43201e; --dot: #52615a; --code-bg: #121916;
    --shadow: 0 1px 2px rgb(0 0 0 / 40%);
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0e1412; --surface: #151d1a; --surface-2: #1d2723; --surface-3: #25312c;
  --ink: #e2e9e5; --ink-2: #b3c0b9; --muted: #8b9992; --line: #2a3632;
  --accent: #72c4a8; --accent-ink: #0e1412; --accent-soft: #1f3a32;
  --dense: #1d9bb8; --dense-soft: #133a45; --sparse: #c98500; --sparse-soft: #3d2d10;
  --good: #62c08a; --good-soft: #17352a; --warn: #e0ad4a; --warn-soft: #3a2e12;
  --bad: #f0827a; --bad-soft: #43201e; --dot: #52615a; --code-bg: #121916;
  --shadow: 0 1px 2px rgb(0 0 0 / 40%);
}

/* ------------------------------------------------------------ base */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.55 var(--f-body);
  padding-inline: var(--s-4);
}
[hidden] { display: none !important; }
h1, h2, h3, h4 { font-family: var(--f-display); line-height: 1.15; text-wrap: balance; margin: 0; letter-spacing: -0.01em; }
h1 { font-size: clamp(1.5rem, 1.1rem + 1.6vw, 2.15rem); font-weight: 700; }
h2 { font-size: 1.5rem; font-weight: 700; }
h3 { font-size: 1.05rem; font-weight: 700; }
p { margin: 0; }
code, kbd, pre, .mono { font-family: var(--f-mono); font-size: 0.86em; }
code { background: var(--code-bg); padding: 0.1em 0.35em; border-radius: 4px; }
a { color: var(--accent); }
button, input, select, textarea { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.muted { color: var(--muted); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.num { font-variant-numeric: tabular-nums; }

/* ------------------------------------------------------------ header */
.topbar {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 10;
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--s-3) var(--s-5);
  margin-inline: calc(var(--s-4) * -1); padding: var(--s-3) var(--s-4);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: var(--s-3); }
.brand-mark { position: relative; width: 30px; height: 30px; flex: none; }
.brand-mark i { position: absolute; top: 3px; width: 18px; height: 24px; border-radius: 12px; mix-blend-mode: multiply; }
.brand-mark i:first-child { left: 0; background: var(--dense); }
.brand-mark i:last-child { right: 0; background: var(--sparse); }
:root[data-theme="dark"] .brand-mark i { mix-blend-mode: screen; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .brand-mark i { mix-blend-mode: screen; } }
.brand-name { font-family: var(--f-display); font-weight: 700; font-size: 1.05rem; }
.brand-sub { font-size: 0.78rem; color: var(--muted); }
.tabs { display: flex; flex-wrap: wrap; gap: var(--s-1); }
.tabs a {
  text-decoration: none; color: var(--ink-2); font-weight: 600; font-size: 0.9rem;
  padding: 6px 12px; border-radius: 999px;
}
.tabs a:hover { background: var(--surface-2); }
.tabs a[aria-current="page"] { background: var(--ink); color: var(--bg); }

main { max-width: 1320px; margin-inline: auto; padding-block: var(--s-5) var(--s-7); }
.view { display: grid; gap: var(--s-5); }
.intro { display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: var(--s-4); }
.intro > div:first-child { display: grid; gap: var(--s-2); max-width: 72ch; }
.intro p { color: var(--ink-2); }
.intro-actions { display: flex; gap: var(--s-2); flex-wrap: wrap; }
.foot { max-width: 1320px; margin-inline: auto; padding-block: var(--s-5); border-top: 1px solid var(--line); color: var(--muted); font-size: 0.82rem; }

/* ------------------------------------------------------------ controls */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  border: 1px solid var(--line); background: var(--surface); color: var(--ink);
  padding: 7px 14px; border-radius: 999px; font-weight: 600; font-size: 0.88rem; cursor: pointer;
}
.btn:hover:not(:disabled) { border-color: var(--ink-2); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.danger { color: var(--bad); border-color: color-mix(in srgb, var(--bad) 45%, var(--line)); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn.small { padding: 4px 10px; font-size: 0.8rem; }

.seg { display: inline-flex; flex-wrap: wrap; background: var(--surface-2); border-radius: 999px; padding: 3px; gap: 2px; }
.seg button { border: 0; background: transparent; padding: 5px 12px; border-radius: 999px; cursor: pointer; font-weight: 600; font-size: 0.85rem; color: var(--ink-2); }
.seg button[aria-pressed="true"], .seg button[aria-selected="true"] { background: var(--surface); color: var(--ink); box-shadow: var(--shadow); }

.field { display: grid; gap: 4px; min-width: 0; }
.field label, .label { font-size: 0.72rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.field output { font-family: var(--f-mono); font-size: 0.82rem; color: var(--ink); }
.field .row { display: flex; align-items: center; gap: var(--s-2); }
input[type="range"] { accent-color: var(--accent); width: 100%; min-width: 0; }
input[type="text"], textarea, select {
  width: 100%; border: 1px solid var(--line); background: var(--surface); border-radius: var(--r); padding: 8px 10px;
}
textarea { resize: vertical; min-height: 90px; }
.check { display: inline-flex; align-items: center; gap: 8px; font-size: 0.9rem; cursor: pointer; }
.check input { accent-color: var(--accent); width: 16px; height: 16px; }
.controls { display: flex; flex-wrap: wrap; gap: var(--s-4); align-items: end; }
.controls > .field { flex: 1 1 160px; }

/* ------------------------------------------------------------ lab layout */
.lab { display: grid; gap: var(--s-5); grid-template-columns: minmax(0, 1fr); }
@media (min-width: 1000px) {
  .lab { grid-template-columns: 290px minmax(0, 1fr); align-items: start; }
  .map { position: sticky; top: calc(env(safe-area-inset-top, 0px) + 76px); max-height: calc(100vh - 96px); overflow: auto; }
}

/* map */
.map { display: grid; gap: var(--s-3); padding: var(--s-4); background: var(--surface); border: 1px solid var(--line); border-radius: 12px; }
.map-phase { display: grid; gap: 6px; }
.map-phase > .label { margin-bottom: 2px; }
.node {
  position: relative; display: grid; grid-template-columns: 24px 1fr; column-gap: 8px; align-items: center; text-align: left;
  width: 100%; border: 1px solid var(--line); background: var(--surface); border-radius: var(--r); padding: 6px 8px; cursor: pointer;
}
.node:hover { border-color: var(--ink-2); }
.node-n { grid-row: span 2; display: grid; place-items: center; width: 22px; height: 22px; border-radius: 50%; background: var(--surface-2); font: 600 0.72rem var(--f-mono); color: var(--ink-2); }
.node-t { font-weight: 600; font-size: 0.86rem; line-height: 1.2; }
.node-m { font: 0.72rem var(--f-mono); color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.node.visited .node-n { background: var(--accent-soft); color: var(--accent); }
.node[aria-current="step"] { border-color: var(--accent); box-shadow: inset 3px 0 0 var(--accent); background: color-mix(in srgb, var(--accent-soft) 45%, var(--surface)); }
.node[aria-current="step"] .node-n { background: var(--accent); color: var(--accent-ink); }
.node.dense .node-n { box-shadow: 0 0 0 2px var(--dense); }
.node.sparse .node-n { box-shadow: 0 0 0 2px var(--sparse); }
.node-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.node-pair .node { grid-template-columns: 1fr; }
.node-pair .node-n { display: none; }
.qcall { display: grid; gap: 6px; padding: 8px; border: 1px dashed var(--accent); border-radius: var(--r); }
.qcall > .label { color: var(--accent); }
.flow { height: 10px; width: 2px; background: var(--line); margin-left: 18px; }
.storebox { display: grid; gap: 6px; padding: 10px; border: 1px dashed var(--line); border-radius: var(--r); background: var(--surface-2); }
.storebox.active { border-color: var(--accent); border-style: solid; }
.db { display: grid; grid-template-columns: auto 1fr; gap: 0 8px; align-items: baseline; background: var(--surface); border-radius: 6px; padding: 6px 8px; border: 1px solid var(--line); cursor: pointer; text-align: left; }
.db b { font-family: var(--f-display); }
.db span { font-size: 0.76rem; color: var(--ink-2); }
.db .m { grid-column: 1 / -1; font: 0.72rem var(--f-mono); color: var(--muted); }
.io { font-size: 0.76rem; font-weight: 600; color: var(--accent); min-height: 1.1em; }

/* stage */
.stage { display: grid; gap: var(--s-5); min-width: 0; }
.stage-head { display: grid; gap: var(--s-2); }
.eyebrow { font-size: 0.74rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.lede { max-width: 70ch; color: var(--ink-2); font-size: 1rem; }
.io-row { display: flex; flex-wrap: wrap; gap: var(--s-2); font-size: 0.82rem; }
.io-row span { display: inline-flex; gap: 6px; align-items: baseline; background: var(--surface-2); padding: 4px 10px; border-radius: 999px; }
.io-row b { font-size: 0.68rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }

.panel { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: var(--s-4); display: grid; gap: var(--s-3); min-width: 0; }
.panel > h3 { display: flex; align-items: baseline; justify-content: space-between; gap: var(--s-2); flex-wrap: wrap; }
.panel-note { font-size: 0.85rem; color: var(--ink-2); max-width: 75ch; }
.grid-2 { display: grid; gap: var(--s-4); grid-template-columns: repeat(auto-fit, minmax(min(100%, 340px), 1fr)); align-items: start; }

.qstrip { display: grid; gap: 6px; padding: var(--s-3) var(--s-4); border-radius: 12px; background: var(--ink); color: var(--bg); }
.qstrip .label { color: color-mix(in srgb, var(--bg) 65%, var(--ink)); }
.qstrip q { font-family: var(--f-display); font-size: 1.1rem; quotes: "«" "»"; }
.qstrip .ans { font-size: 0.86rem; opacity: 0.9; }

.prod-note { display: grid; gap: var(--s-2); padding: var(--s-4); border-radius: 12px; border: 1px solid var(--line); background: var(--surface-2); }
.prod-note ul { margin: 0; padding-left: 1.1em; display: grid; gap: 4px; font-size: 0.9rem; color: var(--ink-2); }
.prod-note .btn { justify-self: start; }

.stepper { display: flex; justify-content: space-between; gap: var(--s-2); flex-wrap: wrap; }

/* pills & tags */
.pill { display: inline-flex; align-items: center; gap: 4px; padding: 2px 8px; border-radius: 999px; font-size: 0.74rem; font-weight: 700; white-space: nowrap; }
.pill.good { background: var(--good-soft); color: var(--good); }
.pill.warn { background: var(--warn-soft); color: var(--warn); }
.pill.bad { background: var(--bad-soft); color: var(--bad); }
.pill.neutral { background: var(--surface-2); color: var(--ink-2); }
.pill.dense { background: var(--dense-soft); color: var(--dense); }
.pill.sparse { background: var(--sparse-soft); color: var(--sparse); }
.tag { font: 0.72rem var(--f-mono); background: var(--surface-2); padding: 1px 6px; border-radius: 4px; color: var(--ink-2); }
.callout { display: grid; gap: 4px; padding: var(--s-3) var(--s-4); border-radius: var(--r); font-size: 0.9rem; }
.callout.warn { background: var(--warn-soft); }
.callout.bad { background: var(--bad-soft); }
.callout.good { background: var(--good-soft); }
.callout.info { background: var(--accent-soft); }

/* docs list */
.doc-list { display: grid; gap: var(--s-2); grid-template-columns: repeat(auto-fill, minmax(min(100%, 250px), 1fr)); }
.doc-card { display: grid; gap: 6px; padding: var(--s-3); border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); }
.doc-card.off { opacity: 0.55; }
.doc-card.sel { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.doc-card header { display: flex; justify-content: space-between; gap: var(--s-2); align-items: start; }
.doc-card h4 { font-size: 0.95rem; }
.doc-card .meta { display: flex; flex-wrap: wrap; gap: 6px; }
.doc-card .actions { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; justify-content: space-between; }

/* parse */
.paper-stack { display: grid; gap: var(--s-3); }
.paper {
  position: relative; background: #fffdf8; color: #2b2a26; border: 1px solid #e3ddd0; border-radius: 4px;
  padding: var(--s-5) var(--s-5) var(--s-6); box-shadow: 0 2px 0 #ece6d8, 0 6px 18px rgb(0 0 0 / 8%);
  font-family: Georgia, "Times New Roman", serif; font-size: 0.92rem; line-height: 1.6;
}
.paper h4 { font-family: var(--f-display); font-size: 1rem; margin-bottom: 8px; color: #1d1c19; }
.paper .pg { position: absolute; bottom: 10px; right: 16px; font: 0.72rem var(--f-mono); color: #8a8578; }
pre.code {
  margin: 0; background: var(--code-bg); border: 1px solid var(--line); border-radius: var(--r);
  padding: var(--s-3); overflow: auto; max-height: 420px; font-size: 0.78rem; line-height: 1.5; white-space: pre;
}
pre.code.wrap { white-space: pre-wrap; word-break: break-word; }

/* chunks */
.chunk-text { font-size: 0.95rem; line-height: 2.05; }
.chunk-text .pg-sep { display: block; margin-block: 6px; font: 0.72rem var(--f-mono); color: var(--muted); border-top: 1px dashed var(--line); padding-top: 4px; }
.w { padding: 2px 0; border-radius: 2px; cursor: pointer; }
.w.c0 { background: var(--dense-soft); }
.w.c1 { background: var(--sparse-soft); }
.w.ov { background: repeating-linear-gradient(135deg, var(--dense-soft) 0 5px, var(--sparse-soft) 5px 10px); outline: 1px solid color-mix(in srgb, var(--ink) 20%, transparent); }
.w.hl { box-shadow: 0 2px 0 var(--ink); }
.chunk-list { display: grid; gap: 6px; }
.chunk-item { display: grid; grid-template-columns: auto 1fr; gap: 2px 10px; padding: 8px 10px; border-radius: var(--r); border: 1px solid var(--line); cursor: pointer; background: var(--surface); text-align: left; }
.chunk-item.sel { border-color: var(--accent); }
.chunk-item .tag { grid-row: span 2; align-self: start; }
.chunk-item p { font-size: 0.84rem; color: var(--ink-2); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.legend { display: flex; flex-wrap: wrap; gap: var(--s-3); font-size: 0.8rem; color: var(--ink-2); align-items: center; }
.legend i { display: inline-block; width: 14px; height: 10px; border-radius: 2px; vertical-align: -1px; margin-right: 4px; }

/* vectors */
.vec { display: grid; grid-auto-flow: column; grid-auto-columns: minmax(6px, 1fr); gap: 2px; height: 34px; }
.vec span { border-radius: 2px; background: color-mix(in oklab, var(--dense) calc(var(--a) * 100%), var(--surface-2)); }
.vec.small { height: 14px; gap: 1px; grid-auto-columns: minmax(3px, 1fr); max-width: 160px; }
.vec-axis { display: flex; justify-content: space-between; font: 0.7rem var(--f-mono); color: var(--muted); }
.concepts { display: flex; flex-wrap: wrap; gap: 6px; }
.meter { display: grid; gap: 4px; }
.meter-bar { height: 10px; border-radius: 999px; background: var(--surface-2); overflow: hidden; }
.meter-bar i { display: block; height: 100%; border-radius: 999px; background: var(--dense); }
.sim-val { font-family: var(--f-display); font-size: 2rem; font-weight: 700; }

.scatter { width: 100%; height: auto; display: block; }
.scatter .pt { fill: var(--dot); stroke: var(--surface); stroke-width: 2; cursor: pointer; transition: r 0.15s; }
.scatter .pt:hover { r: 9; }
.scatter .pt.on { fill: var(--dense); }
.scatter .pt.doc { fill: var(--ink-2); }
.scatter .q { fill: var(--ink); stroke: var(--surface); stroke-width: 2; }
.scatter .link { stroke: var(--dense); stroke-width: 1.5; stroke-dasharray: 3 3; opacity: 0.7; }
.scatter text { font: 600 11px var(--f-mono); fill: var(--ink-2); paint-order: stroke; stroke: var(--surface); stroke-width: 3px; }
.scatter .frame { fill: var(--surface); stroke: var(--line); }

/* tables */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--r); }
table.t { border-collapse: collapse; width: 100%; font-size: 0.84rem; }
table.t th, table.t td { padding: 7px 10px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
table.t th { font-size: 0.7rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); background: var(--surface-2); white-space: nowrap; }
table.t tr:last-child td { border-bottom: 0; }
table.t td.n { text-align: right; font-variant-numeric: tabular-nums; font-family: var(--f-mono); font-size: 0.8rem; white-space: nowrap; }
table.t tr.click { cursor: pointer; }
table.t tr.click:hover td { background: var(--surface-2); }
table.t tr.sel td { background: var(--accent-soft); }
table.t tr.dim td { color: var(--muted); }

/* result rows */
.results { display: grid; gap: 6px; }
.res { display: grid; grid-template-columns: 34px minmax(0, 1fr) 150px; gap: 10px; align-items: center; padding: 8px 10px; border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); }
.res .rank { font: 700 0.85rem var(--f-mono); color: var(--muted); }
.res .body { display: grid; gap: 2px; min-width: 0; }
.res .title { font-weight: 600; font-size: 0.88rem; }
.res .snip { font-size: 0.8rem; color: var(--ink-2); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.res .score { display: grid; gap: 3px; font: 0.76rem var(--f-mono); text-align: right; }
.bar { height: 8px; border-radius: 0 4px 4px 0; background: var(--surface-2); overflow: hidden; display: flex; gap: 2px; }
.bar i { display: block; height: 100%; }
.bar i:last-child { border-radius: 0 4px 4px 0; }
.bar .d { background: var(--dense); }
.bar .s { background: var(--sparse); }
.bar .a { background: var(--accent); }
.res.below { opacity: 0.55; }
.res mark, .hl-term { background: var(--sparse-soft); color: inherit; border-radius: 3px; padding: 0 2px; box-shadow: inset 0 -2px 0 var(--sparse); }
@media (max-width: 560px) {
  .res { grid-template-columns: 28px minmax(0, 1fr); }
  .res .score { grid-column: 2; text-align: left; }
}
.move { font: 700 0.72rem var(--f-mono); }
.move.up { color: var(--good); }
.move.down { color: var(--bad); }
.threshold { position: relative; }

.tokens { display: flex; flex-wrap: wrap; gap: 6px; }
.tok { font: 0.8rem var(--f-mono); padding: 2px 8px; border-radius: 4px; background: var(--surface-2); }
.tok.stop { text-decoration: line-through; color: var(--muted); background: transparent; border: 1px dashed var(--line); }
.tok.stem { background: var(--sparse-soft); }
.tok.concept { background: var(--dense-soft); }
.arrow-row { display: grid; gap: 8px; }

.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { border: 1px solid var(--line); background: var(--surface); border-radius: 999px; padding: 5px 12px; cursor: pointer; font-size: 0.84rem; font-weight: 600; text-align: left; }
.chip small { display: block; font-weight: 400; color: var(--muted); font-size: 0.74rem; }
.chip[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-soft); }

.answer { font-size: 1.02rem; line-height: 1.7; }
.cite { display: inline-grid; place-items: center; min-width: 22px; height: 20px; padding: 0 5px; border-radius: 5px; font: 700 0.72rem var(--f-mono); background: var(--accent-soft); color: var(--accent); vertical-align: 1px; }
.cite.bad { background: var(--bad-soft); color: var(--bad); }

/* ------------------------------------------------------------ blue-green */
.bg { display: grid; gap: var(--s-5); grid-template-columns: minmax(0, 1fr); }
@media (min-width: 1080px) { .bg { grid-template-columns: 380px minmax(0, 1fr); align-items: start; } }
.steps { display: grid; gap: var(--s-2); counter-reset: step; }
.step { display: grid; gap: var(--s-2); padding: var(--s-3) var(--s-4); background: var(--surface); border: 1px solid var(--line); border-radius: 12px; }
.step h3 { display: flex; gap: 10px; align-items: baseline; font-size: 0.98rem; }
.step h3::before { counter-increment: step; content: counter(step); display: grid; place-items: center; flex: none; width: 22px; height: 22px; border-radius: 50%; background: var(--surface-2); font: 600 0.72rem var(--f-mono); color: var(--ink-2); }
.step.done h3::before { background: var(--accent); color: var(--accent-ink); }
.step p { font-size: 0.85rem; color: var(--ink-2); }
.step .actions { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.topo { display: grid; gap: var(--s-3); }
.topo-row { display: grid; gap: var(--s-3); grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr)); align-items: stretch; }
.box { position: relative; display: grid; gap: 6px; align-content: start; padding: var(--s-3) var(--s-4); background: var(--surface); border: 1px solid var(--line); border-radius: 12px; transition: border-color 0.3s, box-shadow 0.3s; }
.box.live { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-soft); }
.box.gone { opacity: 0.5; border-style: dashed; }
.box h4 { font-family: var(--f-display); font-size: 1.05rem; display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.box dl { display: grid; grid-template-columns: auto 1fr; gap: 2px 10px; margin: 0; font-size: 0.8rem; }
.box dt { color: var(--muted); }
.box dd { margin: 0; font-family: var(--f-mono); font-size: 0.78rem; }
.alias-pill { display: inline-flex; align-items: center; gap: 6px; padding: 3px 10px; border-radius: 999px; background: var(--accent); color: var(--accent-ink); font: 700 0.76rem var(--f-mono); }
.pointer { display: flex; align-items: center; gap: 10px; font-size: 0.85rem; color: var(--ink-2); flex-wrap: wrap; }
.pointer .line { flex: 1 1 40px; height: 2px; background: var(--accent); min-width: 30px; position: relative; }
.pointer .line::after { content: ""; position: absolute; right: -2px; top: -4px; border: 5px solid transparent; border-left: 7px solid var(--accent); }
.progress { height: 6px; border-radius: 999px; background: var(--surface-2); overflow: hidden; }
.progress i { display: block; height: 100%; background: var(--accent); transition: width 0.4s; }
.docchips { display: flex; flex-wrap: wrap; gap: 4px; }
.docchip { font: 600 0.7rem var(--f-mono); padding: 1px 6px; border-radius: 4px; background: var(--surface-2); color: var(--ink-2); }
.docchip.missing { background: transparent; border: 1px dashed var(--bad); color: var(--bad); }
.docchip.new { background: var(--warn-soft); color: var(--warn); }
.log { display: grid; gap: 0; max-height: 360px; overflow: auto; border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); }
.log-row { display: grid; grid-template-columns: 64px 92px minmax(0, 1fr); gap: 8px; padding: 6px 10px; border-bottom: 1px solid var(--line); font-size: 0.8rem; align-items: baseline; }
.log-row:last-child { border-bottom: 0; }
.log-row time, .log-row .who { font: 0.72rem var(--f-mono); color: var(--muted); }
.log-row.err { background: var(--bad-soft); }
.log-row.ok .who { color: var(--good); }
.log-row.sys .who { color: var(--accent); }
@media (max-width: 560px) { .log-row { grid-template-columns: 1fr; gap: 0; } }

/* ------------------------------------------------------------ sizing */
.sizing { display: grid; gap: var(--s-5); grid-template-columns: minmax(0, 1fr); }
@media (min-width: 1000px) { .sizing { grid-template-columns: 340px minmax(0, 1fr); align-items: start; } }
.stats { display: grid; gap: var(--s-3); grid-template-columns: repeat(auto-fit, minmax(min(100%, 180px), 1fr)); }
.stat { padding: var(--s-3) var(--s-4); border-radius: 12px; background: var(--surface); border: 1px solid var(--line); display: grid; gap: 2px; }
.stat .v { font-family: var(--f-display); font-size: 1.9rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.stat .k { font-size: 0.8rem; color: var(--ink-2); }
.hbar { display: grid; grid-template-columns: 170px minmax(0, 1fr) 90px; gap: 10px; align-items: center; font-size: 0.85rem; }
.hbar .track { height: 12px; background: var(--surface-2); border-radius: 0 4px 4px 0; }
.hbar .track i { display: block; height: 100%; background: var(--accent); border-radius: 0 4px 4px 0; min-width: 2px; }
.hbar .v { font: 0.8rem var(--f-mono); text-align: right; }
@media (max-width: 560px) { .hbar { grid-template-columns: 1fr 80px; } .hbar .track { grid-column: 1 / -1; grid-row: 2; } }

/* ------------------------------------------------------------ docs */
.docs { display: grid; gap: var(--s-5); grid-template-columns: minmax(0, 1fr); }
@media (min-width: 1000px) {
  .docs { grid-template-columns: 280px minmax(0, 1fr); align-items: start; }
  .docs-nav { position: sticky; top: calc(env(safe-area-inset-top, 0px) + 76px); max-height: calc(100vh - 96px); overflow: auto; }
}
.docs-nav { display: grid; gap: var(--s-3); align-content: start; }
#toc { display: grid; gap: 1px; font-size: 0.84rem; }
#toc a { text-decoration: none; color: var(--ink-2); padding: 4px 8px; border-radius: 6px; line-height: 1.3; }
#toc a:hover { background: var(--surface-2); color: var(--ink); }
#toc a.l3 { padding-left: 20px; font-size: 0.8rem; color: var(--muted); }
.md { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: clamp(16px, 3vw, 40px); min-width: 0; }
.md > * + * { margin-top: 0.9em; }
.md h1 { font-size: 1.9rem; }
.md h2 { font-size: 1.45rem; margin-top: 2em; padding-top: 0.6em; border-top: 1px solid var(--line); scroll-margin-top: 90px; }
.md h3 { font-size: 1.12rem; margin-top: 1.6em; scroll-margin-top: 90px; }
.md h4 { font-size: 1rem; margin-top: 1.3em; scroll-margin-top: 90px; }
.md p, .md li { max-width: 78ch; }
.md ul, .md ol { padding-left: 1.3em; }
.md li + li { margin-top: 0.25em; }
.md pre { background: var(--code-bg); border: 1px solid var(--line); border-radius: var(--r); padding: var(--s-3); overflow-x: auto; font-size: 0.8rem; line-height: 1.5; }
.md pre code { background: none; padding: 0; font-size: inherit; }
.md blockquote { margin-inline: 0; padding: var(--s-3) var(--s-4); border-radius: var(--r); background: var(--accent-soft); color: var(--ink); }
.md blockquote > * + * { margin-top: 0.5em; }
.md .table-wrap table { border-collapse: collapse; width: 100%; font-size: 0.85rem; }
.md .table-wrap th, .md .table-wrap td { padding: 7px 10px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.md .table-wrap th { background: var(--surface-2); font-size: 0.78rem; }
.md hr { border: 0; border-top: 1px solid var(--line); }
.md input[type="checkbox"] { accent-color: var(--accent); }
.md .flash { animation: flash 1.6s ease-out; }
@keyframes flash { from { background: var(--warn-soft); } to { background: transparent; } }

.toast { position: fixed; left: 50%; bottom: calc(env(safe-area-inset-bottom, 0px) + 20px); transform: translateX(-50%); background: var(--ink); color: var(--bg); padding: 8px 16px; border-radius: 999px; font-size: 0.85rem; font-weight: 600; z-index: 20; box-shadow: var(--shadow); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

/* ------------------------------------------------------------ portada */
.home { gap: var(--s-7); }
.hero { display: grid; gap: var(--s-6); align-items: center; grid-template-columns: minmax(0, 1fr); padding-block: var(--s-4) 0; }
@media (min-width: 1000px) { .hero { grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); } }
.hero-copy { display: grid; gap: var(--s-4); }
.hero h1 { font-size: clamp(1.9rem, 1.2rem + 2.6vw, 3.1rem); line-height: 1.05; max-width: 20ch; }
.hero-sub { font-size: 1.1rem; color: var(--ink-2); max-width: 58ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--s-2); }
.btn.big { padding: 11px 20px; font-size: 0.98rem; text-decoration: none; }
.btn.ghost { background: transparent; }
a.btn { text-decoration: none; }
.hero-flow { margin: 0; display: grid; gap: 10px; padding: var(--s-5); background: var(--surface); border: 1px solid var(--line); border-radius: 18px; position: relative; }
.hero-flow { gap: 20px; }
.hf-row { display: flex; justify-content: center; }
.hero-flow > * { position: relative; }
.hero-flow > * + *::before { content: "↓"; position: absolute; top: -18px; left: 50%; transform: translateX(-50%); color: var(--muted); font-size: 0.85rem; line-height: 1; }
.hf-split { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.hf { display: grid; justify-items: center; gap: 2px; text-align: center; padding: 10px 14px; border-radius: 12px; font-weight: 700; font-family: var(--f-display); width: 100%; max-width: 280px; background: var(--surface-2); }
.hf small { font: 400 0.78rem var(--f-body); color: var(--ink-2); }
.hf.q { background: var(--ink); color: var(--bg); }
.hf.q small { color: inherit; }
.hf.d { background: var(--dense-soft); box-shadow: inset 0 0 0 1.5px var(--dense); }
.hf.s { background: var(--sparse-soft); box-shadow: inset 0 0 0 1.5px var(--sparse); }
.hf.f { background: linear-gradient(90deg, var(--dense-soft), var(--sparse-soft)); }
.hf.a { background: var(--accent); color: var(--accent-ink); }
.hf.a small { color: inherit; opacity: 0.85; }

.facts { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--s-3); grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr)); }
.facts li { display: grid; gap: 2px; padding: var(--s-3) var(--s-4); border-top: 2px solid var(--accent); }
.facts b { font-family: var(--f-display); font-size: 2.2rem; line-height: 1; font-variant-numeric: tabular-nums; }
.facts span { color: var(--ink-2); font-size: 0.92rem; }

.home-sec { display: grid; gap: var(--s-4); }
.home-sec > h2 { font-size: clamp(1.35rem, 1.1rem + 1vw, 1.8rem); }
.sec-intro { color: var(--ink-2); max-width: 72ch; }
.why { display: grid; gap: var(--s-3); grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); }
.why p { font-size: 1.02rem; max-width: 60ch; }
.c-dense { color: var(--dense); }
.c-sparse { color: var(--sparse); }

.modules { display: grid; gap: var(--s-4); grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr)); }
.module { display: grid; gap: var(--s-2); align-content: start; padding: var(--s-4); background: var(--surface); border: 1px solid var(--line); border-radius: 14px; }
.module ul { margin: 0; padding-left: 1.1em; display: grid; gap: 6px; color: var(--ink-2); font-size: 0.93rem; }
.more-link { font-weight: 700; text-decoration: none; font-size: 0.9rem; }
.more-links { display: flex; flex-wrap: wrap; gap: var(--s-3); }

.journey { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 380px), 1fr)); }
.jstep { display: grid; grid-template-columns: 30px minmax(0, 1fr) auto; gap: 12px; align-items: center; padding: 10px 12px; border-radius: 12px; border: 1px solid var(--line); background: var(--surface); color: inherit; text-decoration: none; min-height: 56px; }
.jstep:hover { border-color: var(--ink-2); }
.jn { display: grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; background: var(--surface-2); font: 600 0.78rem var(--f-mono); }
.jstep.seen .jn { background: var(--accent-soft); color: var(--accent); }
.jt { display: grid; gap: 1px; min-width: 0; }
.jt small { color: var(--ink-2); font-size: 0.84rem; }

.sys-group { display: grid; gap: var(--s-3); }
.sys-group + .sys-group { margin-top: var(--s-5); }
.sys-group > h3 { font-size: 1.1rem; }
.sys-grid { display: grid; gap: var(--s-3); grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); }
.sys { display: grid; gap: var(--s-2); align-content: start; padding: var(--s-4); background: var(--surface); border: 1px solid var(--line); border-radius: 14px; }
.sys header { display: grid; gap: 2px; }
.sys header a { font-family: var(--f-display); font-weight: 700; font-size: 1.05rem; color: var(--ink); text-decoration: none; }
.sys header a:hover { color: var(--accent); }
.sys header small { color: var(--muted); font-size: 0.78rem; }
.sys p { font-size: 0.9rem; color: var(--ink-2); }
.sys-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag-btn { border: 1px solid var(--line); background: var(--surface-2); color: var(--ink-2); border-radius: 999px; padding: 3px 10px; font-size: 0.76rem; font-weight: 600; cursor: pointer; }
.tag-btn:hover { border-color: var(--accent); color: var(--accent); }

.how { display: grid; gap: var(--s-4); grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); }
.how > div { display: grid; gap: var(--s-2); align-content: start; }
.how p { color: var(--ink-2); font-size: 0.95rem; }

/* ------------------------------------------------------------ aprendizaje guiado */
/* términos tocables: abren el glosario */
.term {
  display: inline; padding: 0; margin: 0; border: 0; background: none; font: inherit; color: inherit; cursor: pointer;
  text-decoration: underline dotted 2px; text-decoration-color: var(--accent); text-underline-offset: 3px;
}
.term:hover { color: var(--accent); }
.qstrip .term { text-decoration-color: currentColor; }

/* capas de cada paso */
.layer { display: grid; gap: var(--s-3); min-width: 0; }
.layer-tag {
  justify-self: start; display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.7rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent);
}
.layer-tag::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: currentColor; }
.layer-idea .lede { font-size: 1.08rem; color: var(--ink); max-width: 68ch; }
.analogy { max-width: 68ch; padding: var(--s-2) var(--s-3); border-left: 3px solid var(--accent); background: var(--accent-soft); border-radius: 0 var(--r) var(--r) 0; font-size: 0.95rem; }
.layer-see { gap: var(--s-4); }
.layer-try { padding: var(--s-4); border-radius: 14px; border: 1.5px dashed var(--accent); background: color-mix(in srgb, var(--accent-soft) 40%, var(--surface)); }
.layer-try > p { font-size: 1rem; max-width: 68ch; }
.layer-try .btn { justify-self: start; }
.expect > summary { cursor: pointer; font-weight: 700; color: var(--accent); }
.expect[open] > summary { margin-bottom: 6px; }
.expect p { max-width: 68ch; }
.layer-real { padding: var(--s-3) var(--s-4); border-radius: 14px; border: 1px solid var(--line); background: var(--surface-2); }
.layer-real > summary { list-style: none; cursor: pointer; display: flex; flex-wrap: wrap; align-items: center; gap: var(--s-2); }
.layer-real > summary::-webkit-details-marker { display: none; }
.layer-real > summary::after { content: ""; margin-left: auto; width: 9px; height: 9px; border-right: 2px solid var(--muted); border-bottom: 2px solid var(--muted); transform: rotate(45deg); transition: transform 0.2s; }
.layer-real[open] > summary::after { transform: rotate(-135deg); }
.layer-real[open] > summary { margin-bottom: var(--s-3); }
.layer-real > p { max-width: 70ch; color: var(--ink-2); }
.layer-real ul { margin: 0; padding-left: 1.1em; display: grid; gap: 4px; color: var(--ink-2); font-size: 0.92rem; }
.layer-real > .btn { justify-self: start; }
.layer-real > h3 { font-size: 1rem; margin-top: var(--s-2); }
.layer-real > * + * { margin-top: var(--s-3); }

/* barra de la consulta sobre fondo oscuro */
.sbar { gap: var(--s-2); }
.sbar-top { display: flex; align-items: center; justify-content: space-between; gap: var(--s-2); flex-wrap: wrap; }
.sbar-ctrl { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s-2) var(--s-4); }
.btn.on-dark { background: transparent; color: var(--bg); border-color: color-mix(in srgb, var(--bg) 45%, transparent); }
.seg.on-dark { background: color-mix(in srgb, var(--bg) 16%, transparent); }
.seg.on-dark button { color: color-mix(in srgb, var(--bg) 80%, transparent); }
.seg.on-dark button[aria-pressed="true"] { background: var(--bg); color: var(--ink); box-shadow: none; }
.check.on-dark { color: var(--bg); font-size: 0.88rem; }

/* comparar modos */
.cmp-grid { display: grid; gap: var(--s-3); grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); }
.cmp { display: grid; gap: 6px; align-content: start; padding: var(--s-3); border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
.cmp.cur { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.cmp header { display: flex; align-items: center; justify-content: space-between; gap: var(--s-2); flex-wrap: wrap; }
.cmp ol { margin: 0; padding-left: 1.2em; font-size: 0.86rem; display: grid; gap: 2px; }
.cmp p { font-size: 0.88rem; color: var(--ink-2); }
.cmp .pill { justify-self: start; }

/* sin RAG vs con RAG */
.vs { display: grid; gap: var(--s-4); grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); }
.vs-card.bad { border-top: 4px solid var(--bad); }
.vs-card.good { border-top: 4px solid var(--good); }
.vs-card .pill { justify-self: start; }
.src { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; font-size: 0.86rem; color: var(--ink-2); }

/* línea de tiempo del resumen */
.timeline { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; }
.timeline li { position: relative; padding-left: 0; }
.timeline li + li::before { content: ""; position: absolute; left: 21px; top: -8px; height: 12px; width: 2px; background: var(--line); }
.tl-item { display: grid; grid-template-columns: 30px minmax(0, 1fr); gap: 12px; align-items: start; width: 100%; text-align: left; padding: 8px 6px; border: 0; background: none; border-radius: 10px; cursor: pointer; }
.tl-item:hover { background: var(--surface-2); }
.tl-n { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; background: var(--accent-soft); color: var(--accent); font: 700 0.8rem var(--f-mono); }
.tl-body { display: grid; gap: 1px; min-width: 0; }
.tl-body span { color: var(--ink-2); font-size: 0.9rem; overflow-wrap: anywhere; }
.next { display: flex; flex-wrap: wrap; gap: var(--s-2); }

/* comprobación */
.quiz { gap: var(--s-4); }
.qitem { display: grid; gap: var(--s-2); }
.qq { font-weight: 700; }
.qopts { display: grid; gap: 6px; }
.qopt { text-align: left; padding: 10px 14px; border-radius: 10px; border: 1px solid var(--line); background: var(--surface); cursor: pointer; font-size: 0.95rem; min-height: 44px; color: var(--ink); }
.qopt:hover:not(:disabled) { border-color: var(--accent); }
.qopt:disabled { cursor: default; }
.qopt.right { border-color: var(--good); background: var(--good-soft); }
.qopt.wrong { border-color: var(--bad); background: var(--bad-soft); }
.qwhy { font-size: 0.9rem; padding: var(--s-2) var(--s-3); border-radius: var(--r); }
.qwhy.good { background: var(--good-soft); }
.qwhy.bad { background: var(--bad-soft); }
.qfoot { display: flex; align-items: center; justify-content: space-between; gap: var(--s-2); flex-wrap: wrap; font-weight: 700; }

/* hoja de pregunta y de término */
.qs-list { display: grid; gap: 6px; }
.qs-item { display: grid; gap: 2px; text-align: left; padding: 10px 12px; border-radius: 10px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); cursor: pointer; }
.qs-item[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-soft); }
.qs-item small { color: var(--ink-2); }
.term-body .t-def { font-size: 1.02rem; }
.t-real { color: var(--ink-2); font-size: 0.92rem; }
.t-rel { display: grid; gap: 6px; }

/* glosario */
.g-tools { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s-3); }
.g-tools input { max-width: 420px; }
.g-list { display: grid; gap: var(--s-3); grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr)); }
.gcard { display: grid; gap: var(--s-2); align-content: start; padding: var(--s-4); background: var(--surface); border: 1px solid var(--line); border-radius: 14px; }
.gcard h3 { font-size: 1.1rem; }
.gcard .t-def { font-size: 0.95rem; }
.gcard .btn { justify-self: start; }

/* camino avanzado */
.adv { display: grid; gap: var(--s-4); grid-template-columns: repeat(auto-fit, minmax(min(100%, 340px), 1fr)); }
.adv-card { display: grid; gap: var(--s-3); align-content: start; padding: var(--s-5); background: var(--surface); border: 1px solid var(--line); border-radius: 16px; }
.adv-card h2 { font-size: 1.3rem; }
.adv-card p { color: var(--ink-2); }
.adv-card .btn { justify-self: start; }
.whatis { gap: 8px; }
.eyebrow a { color: inherit; text-decoration: none; }
.eyebrow a:hover { color: var(--accent); }

/* ------------------------------------------------------------ piezas nuevas (todas las pantallas) */
.tabs a svg { display: none; width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.tab-short { display: none; }
.install { order: 2; white-space: nowrap; flex: none; }
.panel-aside { font-weight: 400; font-size: 0.85rem; }
.stage-top { display: grid; gap: 6px; }
.stage-top .progress { height: 4px; }
.steps-btn, .swipe-hint { display: none; }
details.panel > summary, details.prod-note > summary, details.step > summary, .toc-wrap > summary {
  list-style: none; cursor: pointer; display: flex; align-items: center; justify-content: space-between; gap: var(--s-2);
}
details > summary::-webkit-details-marker { display: none; }
details.panel > summary::after, details.prod-note > summary::after, details.step > summary::after, .toc-wrap > summary::after {
  content: ""; flex: none; width: 9px; height: 9px; border-right: 2px solid var(--muted); border-bottom: 2px solid var(--muted);
  transform: rotate(45deg); transition: transform 0.2s; margin-right: 4px;
}
details[open] > summary::after { transform: rotate(-135deg); }
details.panel > summary h3 { flex: 1; display: flex; align-items: baseline; justify-content: space-between; gap: var(--s-2); flex-wrap: wrap; }
details.panel[open] > summary { margin-bottom: var(--s-1); }
.toc-wrap > summary { font-size: 0.72rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); padding: 6px 8px; }
.toc-wrap[open] > summary { margin-bottom: 4px; }

dialog.sheet { border: 0; padding: 0; background: var(--surface); color: var(--ink); border-radius: 16px; width: min(520px, 100%); max-height: 86vh; box-shadow: 0 10px 40px rgb(0 0 0 / 35%); }
dialog.sheet::backdrop { background: rgb(8 12 10 / 55%); }
.sheet-head { position: sticky; top: 0; z-index: 1; display: flex; align-items: center; justify-content: space-between; gap: var(--s-3); padding: var(--s-4); background: var(--surface); border-bottom: 1px solid var(--line); }
.sheet-head h2 { font-size: 1.15rem; }
.sheet-body { padding: var(--s-3) var(--s-4) calc(var(--s-5) + env(safe-area-inset-bottom, 0px)); display: grid; gap: var(--s-3); }
.sheet-body .node { min-height: 52px; }
.sheet-body .flow { display: none; }

/* ------------------------------------------------------------ teléfono y tableta: un paso a la vez */
@media (max-width: 999px) {
  :root { --nav-h: 64px; --stepper-h: 68px; }
  body { font-size: 16px; padding-bottom: calc(var(--nav-h) + env(safe-area-inset-bottom, 0px) + var(--s-4)); }
  body.lab-active { padding-bottom: calc(var(--nav-h) + var(--stepper-h) + env(safe-area-inset-bottom, 0px) + var(--s-4)); }
  main { padding-block: var(--s-3) var(--s-5); }
  .view { gap: var(--s-4); }
  .foot { padding-bottom: var(--s-3); }

  /* barra superior compacta */
  /* sin backdrop-filter: crearía un bloque contenedor y la barra de pestañas (fixed) quedaría atrapada arriba */
  .topbar { position: sticky; top: 0; padding: calc(env(safe-area-inset-top, 0px) + 8px) var(--s-4) 8px; gap: var(--s-2); flex-wrap: nowrap; backdrop-filter: none; background: var(--bg); }
  .brand-sub { display: none; }
  .brand-name { font-size: 1rem; }
  .brand-mark { width: 26px; height: 26px; }
  .brand-mark i { width: 16px; height: 20px; }

  /* navegación inferior al alcance del pulgar */
  .tabs {
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 30;
    display: grid; grid-template-columns: repeat(5, 1fr); gap: 2px;
    padding: 6px 6px calc(6px + env(safe-area-inset-bottom, 0px));
    background: var(--surface); border-top: 1px solid var(--line);
  }
  .tabs a { display: grid; justify-items: center; align-content: center; gap: 2px; min-height: 52px; padding: 4px 2px; border-radius: 12px; font-size: 0.7rem; }
  .home { gap: var(--s-6); }
  .hero-actions .btn { flex: 1 1 100%; justify-content: center; min-height: 48px; }
  .jstep { grid-template-columns: 28px minmax(0, 1fr); }
  .jstep .pill { display: none; }
  .tag-btn { min-height: 34px; }
  .tabs a svg { display: block; }
  .tabs a[aria-current="page"] { background: var(--accent-soft); color: var(--accent); }
  .tab-long { display: none; }
  .tab-short { display: inline; }

  /* recorrido: sin mapa lateral; la hoja "Todas las etapas" lo reemplaza */
  .map { display: none; }
  #view-lab .intro { display: none; }
  #view-lab.at-start .intro { display: flex; }
  #view-lab .intro-actions { display: none; }
  .intro h1 { font-size: 1.45rem; }
  .intro p { font-size: 0.95rem; }

  .stage { gap: var(--s-4); }
  .stage-top { position: sticky; top: var(--topbar-h, 58px); z-index: 5; margin-inline: calc(var(--s-4) * -1); padding: 8px var(--s-4); background: var(--bg); border-bottom: 1px solid var(--line); }
  .steps-btn { display: inline-flex; align-items: center; gap: 6px; justify-self: start; min-height: 40px; padding: 6px 14px; border-radius: 999px; border: 1px solid var(--line); background: var(--surface); font-weight: 700; font-size: 0.9rem; cursor: pointer; }
  .swipe-hint { display: block; font-size: 0.72rem; color: var(--muted); }
  .stage-head h2 { font-size: 1.45rem; }
  .lede { font-size: 1rem; line-height: 1.6; }
  .io-row span { font-size: 0.8rem; }

  .stepper {
    position: fixed; left: 0; right: 0; z-index: 25;
    bottom: calc(var(--nav-h) + env(safe-area-inset-bottom, 0px));
    display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.5fr); gap: var(--s-2);
    padding: 8px var(--s-4); background: var(--bg);
    border-top: 1px solid var(--line); box-shadow: 0 -6px 16px rgb(0 0 0 / 6%);
  }
  .stepper .btn { min-height: 48px; justify-content: center; min-width: 0; font-size: 0.92rem; }
  .ellip { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; }

  /* paneles y contenido: medidas cómodas, nada se encima */
  .panel { padding: var(--s-3) var(--s-4); border-radius: 14px; }
  .panel > h3, details.panel > summary h3 { font-size: 1rem; }
  details.panel > summary { min-height: 32px; }
  .grid-2 { gap: var(--s-4); }
  .qstrip { padding: var(--s-3); border-radius: 14px; }
  .qstrip q { font-size: 1rem; }
  .qstrip .ans { display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
  .prod-note { padding: var(--s-3) var(--s-4); }
  .prod-note h3 { font-size: 1rem; }
  pre.code { max-height: 300px; font-size: 0.74rem; }
  .chunk-text { font-size: 1rem; line-height: 2.1; }
  .paper { padding: var(--s-4) var(--s-4) var(--s-6); font-size: 0.95rem; }
  .res { padding: 10px 12px; }
  .res .snip { -webkit-line-clamp: 3; }
  .doc-list { grid-template-columns: 1fr; }

  /* filas de chips: se deslizan en horizontal en lugar de apilar muchas líneas */
  .chips { flex-wrap: nowrap; overflow-x: auto; scroll-snap-type: x proximity; margin-inline: calc(var(--s-4) * -1); padding: 2px var(--s-4) 6px; scrollbar-width: none; }
  .chips::-webkit-scrollbar { display: none; }
  .chip { flex: none; max-width: 78vw; scroll-snap-align: start; }
  .chip small { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

  /* aprendizaje guiado en el teléfono */
  .layer-idea .lede { font-size: 1.02rem; }
  .layer-try, .layer-real { padding: var(--s-3); }
  .sbar-ctrl { flex-direction: column; align-items: stretch; }
  .seg.on-dark { display: grid; grid-template-columns: repeat(3, 1fr); }
  .seg.on-dark button { padding-inline: 6px; font-size: 0.8rem; }
  .adv-card { padding: var(--s-4); }
  .g-tools input { max-width: none; }

  /* controles en una sola columna: cada ajuste ocupa el ancho completo */
  .controls { flex-direction: column; align-items: stretch; gap: var(--s-3); }
  .controls > .field { flex: none; }
  .seg { align-self: flex-start; }

  /* formularios: 16px evita el zoom automático de iOS */
  input[type="text"], textarea, select { font-size: 16px; min-height: 44px; }
  .field .row { flex-wrap: wrap; }
  .field .row .btn { flex: 1 1 auto; }

  /* hoja de etapas como panel inferior */
  dialog.sheet { margin: auto 0 0; width: 100%; max-width: 100%; border-radius: 18px 18px 0 0; max-height: 82vh; }

  /* blue-green y documentación */
  .step { padding: var(--s-3) var(--s-4); }
  .step > summary { min-height: 40px; }
  .docs-nav { gap: var(--s-2); }
  .toc-wrap { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 4px; }
  #toc { max-height: 55vh; overflow: auto; }
  #toc a { padding: 10px 8px; }
  .md { padding: var(--s-4); }
  .md h1 { font-size: 1.5rem; }
  .md h2 { font-size: 1.25rem; scroll-margin-top: 70px; }
  .md h3, .md h4 { scroll-margin-top: 70px; }
  .toast { bottom: calc(var(--nav-h) + var(--stepper-h) + env(safe-area-inset-bottom, 0px) + 12px); }
}

/* pantallas táctiles: objetivos de al menos 44px */
@media (pointer: coarse) {
  .btn { min-height: 44px; }
  .btn.small { min-height: 38px; }
  .chip { min-height: 44px; }
  .seg button { min-height: 40px; padding-inline: 14px; }
  .check { min-height: 44px; }
  .check input { width: 22px; height: 22px; }
  input[type="range"] { height: 36px; }
  .node { min-height: 48px; }
  table.t td, table.t th { padding: 10px 12px; }
}

/* app instalada: respeta el notch en la barra superior */
@media (display-mode: standalone) {
  .topbar { padding-top: calc(env(safe-area-inset-top, 0px) + 10px); }
}