/* Layout: full-height app. Top bar + path chips, then a pannable map (tiers = rows, branches = columns)
   or an ordered path list, with a detail drawer on the right (bottom sheet on phones). */
:root {
  --paper: #edf1f2;
  --paper-2: #e3e9eb;
  --panel: #ffffff;
  --ink: #13202a;
  --ink-2: #44545f;
  --ink-3: #7d8d97;
  --line: #d3dce0;
  --line-2: #bfcbd1;
  --next: #d97a00;
  --next-soft: #fff1dc;
  --done: #1f8a5b;
  --done-soft: #def3e8;
  --learning: #2d6cdf;
  --skip: #8a96a0;
  --lane-s: 58%;
  --lane-l: 42%;
  --lane-bg-l: 95%;
  --shadow: 0 1px 2px rgba(19, 32, 42, .08), 0 6px 24px rgba(19, 32, 42, .08);
  --f-display: "Bricolage Grotesque", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  --f-body: "Atkinson Hyperlegible", "Segoe UI", system-ui, -apple-system, sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0d1419; --paper-2: #121b21; --panel: #162129; --ink: #e5edf1; --ink-2: #a6b5be; --ink-3: #6b7c87;
    --line: #24323b; --line-2: #33434e; --next: #ffad33; --next-soft: #3a2a10; --done: #4cc58c; --done-soft: #12301f;
    --learning: #6ea0ff; --skip: #6b7882; --lane-s: 62%; --lane-l: 66%; --lane-bg-l: 16%;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 28px rgba(0, 0, 0, .35);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0d1419; --paper-2: #121b21; --panel: #162129; --ink: #e5edf1; --ink-2: #a6b5be; --ink-3: #6b7c87;
  --line: #24323b; --line-2: #33434e; --next: #ffad33; --next-soft: #3a2a10; --done: #4cc58c; --done-soft: #12301f;
  --learning: #6ea0ff; --skip: #6b7882; --lane-s: 62%; --lane-l: 66%; --lane-bg-l: 16%;
  --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 28px rgba(0, 0, 0, .35);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font: 15px/1.5 var(--f-body); -webkit-font-smoothing: antialiased;
  overflow: hidden;
}
button, input { font: inherit; color: inherit; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--learning); outline-offset: 2px; }
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
h1, h2, h3, h4 { font-family: var(--f-display); text-wrap: balance; margin: 0; letter-spacing: -.01em; }

.app { height: 100%; display: flex; flex-direction: column; }

/* ---------- top bar ---------- */
.topbar {
  display: flex; align-items: center; gap: 20px;
  padding-block: 10px;
  padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px));
  background: var(--panel); border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.brand-mark { width: 30px; height: 30px; flex: none; fill: var(--ink); stroke: var(--ink); }
.brand-name { font-family: var(--f-display); font-weight: 800; font-size: 18px; letter-spacing: -.02em; line-height: 1.1; white-space: nowrap; }
.brand-sub { font-size: 12px; color: var(--ink-3); white-space: nowrap; }

.search-wrap { position: relative; flex: 1; max-width: 420px; margin-left: auto; }
.search-wrap input {
  width: 100%; height: 36px; padding: 0 34px 0 12px; border-radius: 8px;
  border: 1px solid var(--line); background: var(--paper);
}
.search-wrap input:focus { outline: none; border-color: var(--learning); background: var(--panel); }
.search-kbd { position: absolute; right: 9px; top: 8px; font: 11px var(--f-mono); color: var(--ink-3); border: 1px solid var(--line-2); border-radius: 4px; padding: 0 5px; }
.search-results {
  position: absolute; top: 42px; left: 0; right: 0; z-index: 40; list-style: none; margin: 0; padding: 6px;
  background: var(--panel); border: 1px solid var(--line); border-radius: 10px; box-shadow: var(--shadow);
  max-height: 60vh; overflow: auto;
}
.search-results li button {
  width: 100%; text-align: left; border: 0; background: none; padding: 8px 10px; border-radius: 6px; cursor: pointer;
  display: grid; grid-template-columns: 10px 1fr auto; gap: 10px; align-items: center;
}
.search-results li button:hover, .search-results li button.active { background: var(--paper); }
.search-results .r-sub { grid-column: 2 / 4; font-size: 12px; color: var(--ink-3); margin-top: -4px; }
.search-results .r-tier { font: 11px var(--f-mono); color: var(--ink-3); }
.search-results .empty { padding: 10px; color: var(--ink-3); font-size: 13px; }

.top-actions { display: flex; align-items: center; gap: 8px; }
.btn {
  height: 34px; padding: 0 12px; border-radius: 8px; border: 1px solid var(--line-2); background: var(--panel);
  cursor: pointer; font-size: 14px; white-space: nowrap;
}
.btn:hover { border-color: var(--ink-3); }
.btn.ghost { background: transparent; }
.btn.primary { background: var(--ink); color: var(--panel); border-color: var(--ink); font-weight: 700; }
.btn.icon { width: 34px; padding: 0; font-weight: 700; font-size: 16px; }
.btn.icon.wide { width: auto; padding: 0 10px; font-size: 13px; }
.creator { display: flex; align-items: center; gap: 2px; margin-right: 4px; }
.creator-by { font-size: 12.5px; color: var(--ink-3); margin-right: 6px; white-space: nowrap; }
.creator-by b { color: var(--ink-2); }
.soc { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 8px; color: var(--ink-3); }
.soc:hover { color: var(--ink); background: var(--paper); }
.soc svg { width: 16px; height: 16px; fill: currentColor; }
.share-btn { display: inline-flex; align-items: center; gap: 6px; font-weight: 700; }
.share-btn svg { width: 16px; height: 16px; }
.seg { display: inline-flex; border: 1px solid var(--line-2); border-radius: 8px; padding: 2px; background: var(--paper); }
.seg button { border: 0; background: none; padding: 4px 14px; border-radius: 6px; cursor: pointer; font-size: 14px; color: var(--ink-2); }
.seg button[aria-selected="true"] { background: var(--panel); color: var(--ink); font-weight: 700; box-shadow: 0 1px 2px rgba(0,0,0,.12); }

/* ---------- role chips ---------- */
.roles {
  display: flex; align-items: center; gap: 12px;
  padding-block: 8px;
  padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px));
  background: var(--panel); border-bottom: 1px solid var(--line);
}
.roles-label { font: 600 11px var(--f-mono); text-transform: uppercase; letter-spacing: .08em; color: var(--ink-3); }
.role-chips { display: flex; gap: 6px; overflow-x: auto; scrollbar-width: none; min-width: 0; flex: 1; }
.role-chips::-webkit-scrollbar { display: none; }
.chip {
  flex: none; height: 30px; padding: 0 12px; border-radius: 15px; border: 1px solid var(--line-2);
  background: transparent; cursor: pointer; font-size: 13.5px; color: var(--ink-2);
}
.chip:hover { color: var(--ink); border-color: var(--ink-3); }
.chip[aria-pressed="true"] { background: var(--ink); color: var(--panel); border-color: var(--ink); font-weight: 700; }
.progress { display: flex; align-items: center; gap: 10px; flex: none; font-size: 13px; color: var(--ink-2); }
.progress .bar { width: 120px; height: 6px; border-radius: 3px; background: var(--paper-2); overflow: hidden; }
.progress .bar i { display: block; height: 100%; background: var(--done); border-radius: 3px; transition: width .3s; }
.progress b { font-variant-numeric: tabular-nums; color: var(--ink); }

/* ---------- stage ---------- */
.stage { position: relative; flex: 1; min-height: 0; display: flex; }
.map-view { position: relative; flex: 1; min-width: 0; overflow: hidden; }
.viewport { position: absolute; inset: 0; overflow: hidden; cursor: grab; touch-action: none; user-select: none; -webkit-user-select: none; }
.viewport.dragging { cursor: grabbing; }
.world { position: absolute; left: 0; top: 0; transform-origin: 0 0; }
.edges { position: absolute; left: 0; top: 0; overflow: visible; pointer-events: none; }
.nodes { position: absolute; left: 0; top: 0; }

/* tier bands and lane headers live inside .nodes */
.band { position: absolute; left: 0; border-top: 1px dashed var(--line-2); }
.band:nth-child(even) { background: color-mix(in srgb, var(--paper-2) 55%, transparent); }
.band-label { position: absolute; left: 18px; top: 18px; width: 118px; }
.band-label .t-num { font: 600 11px var(--f-mono); letter-spacing: .08em; color: var(--ink-3); text-transform: uppercase; }
.band-label .t-name { font: 800 21px/1.1 var(--f-display); letter-spacing: -.02em; margin-top: 2px; }
.band-label .t-blurb { font-size: 11.5px; line-height: 1.35; color: var(--ink-3); margin-top: 6px; }
.lane-head { position: absolute; top: 22px; text-align: center; font: 700 12px var(--f-mono); letter-spacing: .06em; text-transform: uppercase; color: hsl(var(--h) var(--lane-s) var(--lane-l)); }
.lane-head::after { content: ""; display: block; margin: 8px auto 0; width: 28px; height: 3px; border-radius: 2px; background: currentColor; }
.lane-col { position: absolute; top: 60px; width: 1px; background: var(--line); opacity: .6; }

/* nodes */
.node {
  position: absolute; display: flex; flex-direction: column; justify-content: center; gap: 3px;
  padding: 8px 10px 8px 12px; border-radius: 10px; cursor: pointer; text-align: left;
  background: var(--panel); border: 1.5px solid var(--line-2);
  box-shadow: 0 1px 1px rgba(0,0,0,.04);
  transition: opacity .2s, filter .2s, box-shadow .15s, transform .15s, border-color .15s;
}
.node:hover { box-shadow: var(--shadow); transform: translateY(-1px); }
.node .n-title { flex: none; font-weight: 700; font-size: 13.5px; line-height: 1.22; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.node .n-meta { flex: none; display: flex; align-items: center; gap: 6px; font: 11px var(--f-mono); color: var(--ink-3); }
.node .n-dot { width: 8px; height: 8px; border-radius: 50%; background: hsl(var(--h) var(--lane-s) var(--lane-l)); flex: none; }
.node .n-meta { white-space: nowrap; min-width: 0; }
.node .n-info { overflow: hidden; text-overflow: ellipsis; min-width: 0; }
.node .n-status { margin-left: auto; font-weight: 600; flex: none; }
.node.rel-c { border-color: hsl(var(--h) var(--lane-s) var(--lane-l)); border-width: 2px; }
.node.rel-c .n-meta .n-rel { color: hsl(var(--h) var(--lane-s) var(--lane-l)); font-weight: 600; }
.node.rel-a { border-style: dashed; }
.node.off { opacity: .22; filter: grayscale(1); }
.node.off:hover { opacity: .6; }
.node.locked:not(.off) .n-title { color: var(--ink-2); }
.node.st-done { background: var(--done-soft); border-color: var(--done); }
.node.st-done .n-status { color: var(--done); }
.node.st-learning { box-shadow: 0 0 0 3px color-mix(in srgb, var(--learning) 30%, transparent); }
.node.st-learning .n-status { color: var(--learning); }
.node.st-skip { opacity: .5; }
.node.st-skip .n-title { text-decoration: line-through; text-decoration-color: var(--ink-3); }
.node.next { box-shadow: 0 0 0 3px var(--next-soft), 0 0 0 4.5px var(--next); }
.node.next .n-status { color: var(--next); }
.node.sel { box-shadow: 0 0 0 3px var(--panel), 0 0 0 5px var(--ink); z-index: 2; }
.node.match { box-shadow: 0 0 0 3px var(--panel), 0 0 0 5px var(--learning); }
.nodes.focus .node:not(.chain):not(.sel) { opacity: .2; }

.edge { fill: none; stroke: var(--line-2); stroke-width: 1.4; transition: opacity .2s, stroke .2s; }
.edge.off { opacity: .25; }
.edges.focus .edge { opacity: .12; }
.edges.focus .edge.anc { opacity: 1; stroke: var(--ink-2); stroke-width: 2; }
.edges.focus .edge.desc { opacity: 1; stroke: var(--next); stroke-width: 2; stroke-dasharray: 5 4; }

.map-controls { position: absolute; right: 16px; bottom: calc(16px + env(safe-area-inset-bottom, 0px)); display: flex; gap: 6px; z-index: 5; }
.map-controls .btn { box-shadow: var(--shadow); }
.legend {
  position: absolute; left: 16px; bottom: calc(16px + env(safe-area-inset-bottom, 0px)); z-index: 5;
  background: var(--panel); border: 1px solid var(--line); border-radius: 10px; box-shadow: var(--shadow);
  padding: 10px 12px; font-size: 12px; color: var(--ink-2); display: grid; grid-template-columns: auto auto; gap: 6px 16px;
}
.legend .lg { display: flex; align-items: center; gap: 8px; white-space: nowrap; }
.legend .sw { width: 22px; height: 14px; border-radius: 4px; border: 1.5px solid var(--line-2); background: var(--panel); flex: none; }
.legend .sw.c { border: 2px solid var(--ink-2); }
.legend .sw.a { border-style: dashed; }
.legend .sw.off { opacity: .3; }
.legend .sw.next { box-shadow: 0 0 0 2px var(--next-soft), 0 0 0 3px var(--next); border-color: var(--line-2); }
.legend .sw.done { background: var(--done-soft); border-color: var(--done); }
.legend-close { grid-column: 1 / -1; justify-self: start; border: 0; background: none; padding: 0; color: var(--ink-3); font-size: 11.5px; cursor: pointer; text-decoration: underline; }

.role-banner {
  position: absolute; top: 14px; left: 50%; transform: translateX(-50%); z-index: 5; max-width: min(680px, calc(100% - 32px));
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow);
  padding: 10px 14px; display: flex; gap: 14px; align-items: center; font-size: 13.5px;
}
.role-banner .rb-text { min-width: 0; }
.role-banner b { font-family: var(--f-display); font-size: 15px; }
.role-banner .rb-next { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 4px; }
.mini {
  border: 1px solid var(--next); color: var(--ink); background: var(--next-soft); border-radius: 12px; padding: 1px 9px;
  font-size: 12.5px; cursor: pointer;
}

/* ---------- path view ---------- */
.path-view { flex: 1; min-width: 0; overflow-y: auto; }
.path-inner {
  max-width: 920px; margin: 0 auto; padding-block: 28px 80px;
  padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px));
}
.path-hero { display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: end; padding-bottom: 22px; border-bottom: 1px solid var(--line); }
.path-hero h1 { font-size: clamp(28px, 4vw, 40px); font-weight: 800; letter-spacing: -.03em; line-height: 1.05; }
.path-hero p { margin: 8px 0 0; color: var(--ink-2); max-width: 60ch; }
.eyebrow { font: 600 11px var(--f-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); }
.stats { display: grid; grid-template-columns: repeat(3, auto); gap: 4px 22px; text-align: right; }
.stat b { display: block; font: 800 26px/1 var(--f-display); font-variant-numeric: tabular-nums; }
.stat span { font-size: 12px; color: var(--ink-3); }
.pace { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--ink-2); margin-top: 14px; flex-wrap: wrap; }
.pace input { width: 56px; height: 28px; border-radius: 6px; border: 1px solid var(--line-2); background: var(--panel); padding: 0 6px; font-variant-numeric: tabular-nums; }
.up-next { margin-top: 22px; padding: 14px 16px; border-radius: 12px; background: var(--next-soft); border: 1px solid color-mix(in srgb, var(--next) 40%, transparent); }
.up-next h3 { font-size: 15px; }
.up-next .un-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.up-next .un-list button { border: 1px solid var(--next); background: var(--panel); border-radius: 8px; padding: 6px 10px; cursor: pointer; font-size: 13.5px; text-align: left; }
.up-next .un-list button small { display: block; color: var(--ink-3); font-size: 11.5px; }

.tier-sec { margin-top: 30px; }
.tier-sec-head { display: flex; align-items: baseline; gap: 12px; padding-bottom: 8px; }
.tier-sec-head h2 { font-size: 22px; font-weight: 800; }
.tier-sec-head .eyebrow { margin-left: auto; }
.step-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.step {
  display: grid; grid-template-columns: 28px 1fr auto; gap: 12px; align-items: center; padding: 10px 4px;
  border-bottom: 1px solid var(--line);
}
.step.off { display: none; }
.show-all .step.off { display: grid; opacity: .45; }
.step .check {
  width: 22px; height: 22px; border-radius: 6px; border: 1.5px solid var(--line-2); background: var(--panel); cursor: pointer;
  display: grid; place-items: center; padding: 0; color: var(--panel); font-size: 13px; font-weight: 700;
}
.step.st-done .check { background: var(--done); border-color: var(--done); }
.step.st-learning .check { border-color: var(--learning); color: var(--learning); }
.step.st-skip .check { border-style: dashed; color: var(--ink-3); }
.step .s-main { min-width: 0; cursor: pointer; border: 0; background: none; padding: 0; text-align: left; }
.step .s-title { font-weight: 700; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.step.st-done .s-title { color: var(--ink-2); }
.step.st-skip .s-title { text-decoration: line-through; color: var(--ink-3); }
.step .s-sum { font-size: 13.5px; color: var(--ink-2); display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden; }
.step .s-side { display: flex; align-items: center; gap: 8px; font: 12px var(--f-mono); color: var(--ink-3); white-space: nowrap; }
.tag {
  display: inline-flex; align-items: center; gap: 5px; height: 20px; padding: 0 7px; border-radius: 10px;
  font: 600 10.5px var(--f-mono); letter-spacing: .03em; text-transform: uppercase; white-space: nowrap;
  border: 1px solid var(--line-2); color: var(--ink-2);
}
.tag.lane { color: hsl(var(--h) var(--lane-s) var(--lane-l)); border-color: currentColor; }
.tag.rel-c { background: var(--ink); color: var(--panel); border-color: var(--ink); }
.tag.rel-r { color: var(--ink); }
.tag.rel-a { border-style: dashed; color: var(--ink-3); }
.tag.next { background: var(--next-soft); color: var(--next); border-color: var(--next); }
.path-toggle { margin-top: 26px; font-size: 13px; color: var(--ink-2); display: flex; align-items: center; gap: 8px; }

/* ---------- drawer ---------- */
.drawer {
  position: absolute; top: 0; right: 0; bottom: 0; width: min(460px, 100%); z-index: 20;
  background: var(--panel); border-left: 1px solid var(--line); box-shadow: -12px 0 32px rgba(0,0,0,.08);
  overflow-y: auto; overscroll-behavior: contain;
  animation: slideIn .22s ease-out;
}
@keyframes slideIn { from { transform: translateX(24px); opacity: .4; } to { transform: none; opacity: 1; } }
.drawer-inner { padding: 18px 22px calc(40px + env(safe-area-inset-bottom, 0px)); }
.d-top { display: flex; align-items: center; gap: 8px; }
.d-top .wide-btn { margin-left: auto; font-size: 15px; }
.d-title { font-size: 27px; font-weight: 800; letter-spacing: -.025em; line-height: 1.1; margin-top: 14px; }
.d-meta { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; align-items: center; }
.d-rel {
  margin-top: 14px; padding: 10px 12px; border-radius: 10px; background: var(--paper); font-size: 13.5px;
}
.d-rel .rel-roles { display: flex; flex-wrap: wrap; gap: 4px 12px; margin-top: 6px; font-size: 12px; color: var(--ink-3); }
.d-rel .rel-roles span b { color: var(--ink-2); font-weight: 600; }
.status-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 4px; margin-top: 14px; padding: 3px; border-radius: 10px; background: var(--paper); }
.status-row button { border: 0; background: none; border-radius: 7px; padding: 6px 4px; cursor: pointer; font-size: 13px; color: var(--ink-2); }
.status-row button[aria-pressed="true"] { background: var(--panel); color: var(--ink); font-weight: 700; box-shadow: 0 1px 2px rgba(0,0,0,.12); }
.status-row button[data-s="done"][aria-pressed="true"] { color: var(--done); }
.status-row button[data-s="learning"][aria-pressed="true"] { color: var(--learning); }
.d-sec { margin-top: 24px; }
.d-sec h3 { font: 600 11px var(--f-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 8px; }
.d-sec p { margin: 0; }
.d-sum { font-size: 16.5px; line-height: 1.5; margin-top: 16px; }
.d-callout { padding: 10px 12px; border-left: 3px solid var(--next); background: var(--next-soft); border-radius: 0 8px 8px 0; font-size: 14px; }
.outcomes { margin: 0; padding-left: 20px; display: grid; gap: 4px; font-size: 14.5px; }
.links { display: flex; flex-wrap: wrap; gap: 6px; }
.links button {
  border: 1px solid var(--line-2); background: var(--panel); border-radius: 8px; padding: 4px 9px; font-size: 13px; cursor: pointer;
  display: inline-flex; align-items: center; gap: 6px;
}
.links button .n-dot { width: 7px; height: 7px; border-radius: 50%; background: hsl(var(--h) var(--lane-s) var(--lane-l)); }
.links button.done { border-color: var(--done); }
.links button.done::after { content: "✓"; color: var(--done); font-weight: 700; }
.links .none { font-size: 13px; color: var(--ink-3); }
.bridges { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.bridges p { margin: 4px 0 0 2px; font-size: 13.5px; line-height: 1.45; color: var(--ink-2); }

/* what to learn: subtopics grouped by level, each expanding into key ideas */
.learn-head { display: flex; align-items: center; gap: 12px; }
.learn-head h3 { margin: 0; }
.learn-prog { margin-left: auto; display: flex; align-items: center; gap: 8px; font-size: 12.5px; color: var(--ink-2); }
.learn-prog .bar { width: 90px; height: 6px; border-radius: 3px; background: var(--paper-2); overflow: hidden; }
.learn-prog .bar i { display: block; height: 100%; width: 0; background: var(--done); border-radius: 3px; transition: width .3s; }
.learn-prog b { font-variant-numeric: tabular-nums; color: var(--ink); }
.learn-tools { display: flex; gap: 6px; margin-top: 10px; }
.btn.sm { height: 28px; padding: 0 10px; font-size: 12.5px; }
.learn-foot { font-size: 12.5px; color: var(--ink-3); margin-top: 14px !important; }
.sub-group { margin-top: 18px; }
.sg-head { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; font-size: 13px; color: var(--ink-2); }
.sg-count { margin-left: auto; font: 11px var(--f-mono); color: var(--ink-3); font-variant-numeric: tabular-nums; }
.lvl { font: 600 10px var(--f-mono); text-transform: uppercase; letter-spacing: .05em; padding: 2px 7px; border-radius: 8px; flex: none; }
.lvl.core { background: var(--ink); color: var(--panel); }
.lvl.deep { border: 1px solid var(--ink-2); color: var(--ink-2); }
.lvl.optional { border: 1px dashed var(--ink-3); color: var(--ink-3); }
.subtree { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.sub { border: 1px solid var(--line); border-radius: 10px; background: var(--panel); transition: border-color .15s, box-shadow .15s; }
.sub:hover { border-color: var(--line-2); }
.sub.open { border-color: var(--line-2); box-shadow: 0 2px 10px rgba(19, 32, 42, .06); }
.sub-row { display: flex; align-items: flex-start; padding-left: 10px; }
.sub-row .sub-check { margin-top: 10px; }
.sub-check {
  flex: none; width: 22px; height: 22px; border-radius: 6px; border: 1.5px solid var(--line-2); background: var(--panel); cursor: pointer;
  display: grid; place-items: center; padding: 0; color: transparent; font-size: 13px; font-weight: 700;
}
.sub-check:hover { border-color: var(--done); color: var(--done); }
.sub.got .sub-check { background: var(--done); border-color: var(--done); color: var(--panel); }
.sub-toggle {
  flex: 1; min-width: 0; display: flex; align-items: baseline; gap: 10px; text-align: left; border: 0; background: none;
  padding: 11px 12px 11px 10px; cursor: pointer; font-size: 14.5px; font-weight: 700; line-height: 1.3; color: var(--ink);
}
.sub-num { flex: none; font: 600 11px var(--f-mono); color: var(--ink-3); min-width: 14px; }
.sub-title { flex: 1; min-width: 0; }
.sub.got .sub-title { color: var(--ink-2); }
.sub-count { flex: none; font: 11px var(--f-mono); color: var(--ink-3); white-space: nowrap; }
.sub-toggle .chev { flex: none; color: var(--ink-3); transition: transform .15s; font-size: 11px; }
.sub.open .sub-toggle .chev { transform: rotate(90deg); }
.sub-body { padding: 0 14px 14px 56px; font-size: 14px; color: var(--ink-2); }
.sub-desc { line-height: 1.55; }
.sub-body h4 { font: 600 10.5px var(--f-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); margin: 16px 0 8px; }
.concepts { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; counter-reset: c; }
.concepts li {
  counter-increment: c; position: relative; padding: 9px 12px 9px 36px; border-radius: 8px; background: var(--paper);
  display: grid; gap: 2px; align-content: start; line-height: 1.45;
}
.concepts li::before {
  content: counter(c); position: absolute; left: 10px; top: 10px; width: 18px; height: 18px; border-radius: 50%;
  background: var(--panel); border: 1px solid var(--line-2); display: grid; place-items: center; font: 600 10px var(--f-mono); color: var(--ink-3);
}
.concepts b { color: var(--ink); font-size: 14px; }
.concepts span { font-size: 13.5px; }

/* wide panel: overview on the left, the learning plan gets the larger right column */
@media (min-width: 641px) {
  .drawer.wide { width: min(1080px, calc(100% - 56px)); }
  .drawer.wide .drawer-inner { padding: 22px 32px 48px; }
  .drawer.wide .d-cols {
    display: grid; grid-template-columns: minmax(0, .85fr) minmax(0, 1.25fr); grid-template-rows: auto 1fr; column-gap: 36px;
    grid-template-areas: "main learn" "more learn";
  }
  .drawer.wide .d-main { grid-area: main; }
  .drawer.wide .d-more { grid-area: more; }
  .drawer.wide .d-learn { grid-area: learn; }
  .drawer.wide .d-learn.d-sec { margin-top: 16px; }
  .drawer.wide .concepts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .drawer.wide .wide-btn { color: var(--ink); border-color: var(--ink-3); }
}

/* resources */
.res-list { display: grid; gap: 6px; }
.res {
  display: grid; grid-template-columns: 30px 1fr; gap: 10px; align-items: start; padding: 9px 10px; border-radius: 9px;
  border: 1px solid var(--line); text-decoration: none; background: var(--panel);
}
.res:hover { border-color: var(--line-2); background: var(--paper); }
.res .ico { width: 30px; height: 30px; border-radius: 8px; background: var(--paper-2); display: grid; place-items: center; color: var(--ink-2); }
.res .ico svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.res .r-title { font-weight: 700; font-size: 14px; line-height: 1.3; }
.res .r-meta { display: flex; gap: 8px; flex-wrap: wrap; font: 11px var(--f-mono); color: var(--ink-3); margin-top: 2px; text-transform: uppercase; letter-spacing: .03em; }
.res .r-meta .free { color: var(--done); }
.res .r-meta .start { color: var(--next); font-weight: 600; }
.res.first { border-color: color-mix(in srgb, var(--next) 55%, transparent); }
.d-project { padding: 12px 14px; border-radius: 10px; border: 1.5px dashed var(--line-2); font-size: 14.5px; }
.d-empty { color: var(--ink-3); font-size: 14px; padding: 12px; border: 1px dashed var(--line-2); border-radius: 10px; }
.d-nav { display: flex; justify-content: space-between; gap: 8px; margin-top: 28px; }
.d-nav .btn { max-width: 48%; overflow: hidden; text-overflow: ellipsis; }

/* ---------- modal ---------- */
.modal { position: fixed; inset: 0; z-index: 60; background: rgba(8, 14, 18, .45); display: grid; place-items: center; padding: 16px; }
.modal-card {
  width: min(760px, 100%); max-height: calc(100% - 32px); overflow-y: auto; background: var(--panel); border-radius: 16px;
  box-shadow: var(--shadow); padding: 24px;
}
.modal-card h2 { font-size: 26px; font-weight: 800; letter-spacing: -.025em; }
.modal-card .lead { color: var(--ink-2); margin: 8px 0 0; max-width: 60ch; }
.kc-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 18px 20px; margin-top: 20px; }
.kc-group h4 { font: 700 11px var(--f-mono); letter-spacing: .06em; text-transform: uppercase; color: hsl(var(--h) var(--lane-s) var(--lane-l)); margin-bottom: 6px; }
.kc-item { display: flex; gap: 8px; align-items: flex-start; font-size: 14px; padding: 3px 0; cursor: pointer; }
.kc-item input { margin-top: 3px; accent-color: var(--done); }
.kc-item small { color: var(--ink-3); font: 10.5px var(--f-mono); }
.modal-actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 22px; flex-wrap: wrap; }
.modal-actions .spacer { flex: 1; }
.help-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px 24px; margin-top: 18px; font-size: 14.5px; }
.help-grid h4 { font-size: 16px; margin-bottom: 4px; }
.help-grid p { margin: 0; color: var(--ink-2); }
.share-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 8px; margin-top: 18px; }
.share-grid .btn { display: flex; align-items: center; justify-content: flex-start; gap: 10px; height: 42px; text-decoration: none; color: var(--ink); }
.share-grid .btn svg { width: 18px; height: 18px; flex: none; fill: currentColor; }
.share-link { display: flex; gap: 8px; margin-top: 14px; }
.share-link input { flex: 1; min-width: 0; height: 36px; padding: 0 10px; border-radius: 8px; border: 1px solid var(--line-2); background: var(--paper); font: 12.5px var(--f-mono); color: var(--ink); }
.about-me { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px 16px; margin-top: 22px; padding: 14px 16px; border-radius: 12px; background: var(--paper); }
.about-me p { margin: 0; font-size: 14px; color: var(--ink-2); }
.about-me p b { color: var(--ink); font-family: var(--f-display); font-size: 15px; }
.about-me .links { display: flex; gap: 6px; flex-wrap: wrap; }
.about-me .links a { display: inline-flex; align-items: center; gap: 6px; height: 30px; padding: 0 10px; border-radius: 8px; border: 1px solid var(--line-2); background: var(--panel); color: var(--ink); text-decoration: none; font-size: 13px; }
.about-me .links a:hover { border-color: var(--ink-3); }
.about-me .links svg { width: 14px; height: 14px; fill: currentColor; }
.io-area { width: 100%; min-height: 120px; margin-top: 12px; border-radius: 8px; border: 1px solid var(--line-2); background: var(--paper); padding: 10px; font: 12px var(--f-mono); color: var(--ink); }

.toast {
  position: fixed; left: 50%; bottom: calc(24px + env(safe-area-inset-bottom, 0px)); transform: translateX(-50%); z-index: 80;
  background: var(--ink); color: var(--panel); padding: 9px 16px; border-radius: 10px; font-size: 14px; box-shadow: var(--shadow);
}

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .brand-sub, .search-kbd { display: none; }
  .progress .bar { width: 70px; }
  #skillCheckBtn { display: none; }
  .creator-by { display: none; }
}
@media (max-width: 640px) {
  .topbar { flex-wrap: wrap; gap: 10px; }
  .search-wrap { order: 3; flex-basis: 100%; max-width: none; }
  .top-actions { margin-left: auto; }
  .roles-label, .progress .bar { display: none; }
  .creator { display: none; }
  .share-btn { width: 34px; padding: 0; justify-content: center; }
  .share-btn span { display: none; }
  .legend { display: none; }
  .wide-btn, .wide-only { display: none; }
  .sub-body { padding-left: 14px; }
  .d-top .close { margin-left: auto; }
  .drawer { top: auto; height: 88%; width: 100%; border-left: 0; border-top: 1px solid var(--line); border-radius: 16px 16px 0 0; box-shadow: 0 -12px 32px rgba(0,0,0,.18); animation-name: sheetIn; }
  @keyframes sheetIn { from { transform: translateY(40px); opacity: .4; } to { transform: none; opacity: 1; } }
  .path-hero { grid-template-columns: 1fr; }
  .stats { text-align: left; }
  .step { grid-template-columns: 28px 1fr; }
  .step .s-side { grid-column: 2; }
  .help-grid { grid-template-columns: 1fr; }
  .role-banner { top: 10px; font-size: 12.5px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}