/* Learn section (/learn/): built by builder/learn/build_learn.py on the guide shell (guides.css), figures from
   builder/learn/figures.py, interactives from /assets/learn.js?v=f2c7cf3c. */

/* ---------- page furniture */
.guide-page:has(.learn) { background: radial-gradient(900px 520px at 30% -80px, rgba(220, 255, 60, .07), transparent 70%),
  radial-gradient(800px 480px at 85% -120px, rgba(95, 224, 200, .06), transparent 70%), var(--bg); background-repeat: no-repeat; }
.lx-series { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-bottom: 22px; font-family: var(--mono); font-size: 12px; letter-spacing: .06em; text-transform: uppercase; color: var(--faint); }
.lx-series div { display: flex; gap: 6px; }
.lx-series a { display: grid; place-items: center; width: 32px; height: 32px; border-radius: 9px; border: 1px solid var(--line2); color: var(--muted); background: rgba(255, 255, 255, .03); transition: border-color .15s, color .15s; }
.lx-series a:hover { border-color: var(--lime); color: var(--text); }
.lx-series a.on { background: var(--lime); border-color: var(--lime); color: #0b1200; }
.learn .kick span { color: var(--faint); }
.learn .jump { margin-top: 26px; }

.learn ul:not(.srcs):not(.lx-cl):not(.lx-f1), .learn ol:not(.lx-rlist):not(.lx-f1) { color: #c9d4d0; margin-top: 12px; display: grid; gap: 8px; }
.learn ul:not(.srcs):not(.lx-cl) > li { position: relative; padding-left: 22px; }
.learn ul:not(.srcs):not(.lx-cl) > li::before { content: ""; position: absolute; left: 3px; top: .62em; width: 7px; height: 7px; border-radius: 2px; background: var(--lime); transform: rotate(45deg); opacity: .8; }
.learn ol:not(.lx-rlist):not(.lx-f1) { counter-reset: lx; }
.learn ol:not(.lx-rlist):not(.lx-f1) > li { counter-increment: lx; position: relative; padding-left: 38px; min-height: 26px; }
.learn ol:not(.lx-rlist):not(.lx-f1) > li::before { content: counter(lx); position: absolute; left: 0; top: 1px; width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center;
  font: 500 12.5px var(--mono); color: var(--lime); border: 1px solid rgba(220, 255, 60, .4); background: rgba(220, 255, 60, .06); }
.learn li b { color: var(--text); font-weight: 600; }
.learn ul.srcs { list-style: none; padding: 0; display: grid; gap: 6px; }
.learn ul.srcs a { color: var(--muted); }
.learn .eg { font-family: var(--mono); font-size: 15px; color: var(--text); background: rgba(255, 255, 255, .04); border: 1px solid var(--line2); border-radius: 12px; padding: 14px 16px; margin-top: 14px; overflow-x: auto; line-height: 1.7; }
.learn .eg b { color: var(--lime); font-weight: 500; border-radius: 4px; padding: 1px 2px; transition: background .15s, color .15s; }
.learn .callout .eg { font-family: inherit; font-size: 14.5px; color: #c9d4d0; font-style: italic; }
.callout { margin: 26px 0 8px; padding: 18px 20px; border-radius: 14px; border: 1px solid rgba(220, 255, 60, .22); background: linear-gradient(135deg, rgba(220, 255, 60, .06), rgba(95, 224, 200, .03)); }
.callout > b:first-child { display: flex; align-items: center; gap: 10px; font-family: var(--head); font-size: 16px; color: var(--text); }
.callout > b:first-child::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--lime); box-shadow: 0 0 10px var(--lime); }
.callout p b { color: var(--lime); font-weight: 600; }
.callout .tbl { background: rgba(5, 8, 10, .5); }

/* previous / next */
.lx-pn { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 44px; }
.lx-pn a { display: grid; gap: 6px; padding: 16px 18px; border: 1px solid var(--line2); border-radius: 14px; text-decoration: none; color: var(--text); background: rgba(255, 255, 255, .03); transition: border-color .15s, transform .2s var(--ease); }
.lx-pn a:hover { border-color: var(--lime); transform: translateY(-2px); }
.lx-pn a.next { grid-column: 2; text-align: right; }
.lx-pn a.next b { justify-content: flex-end; }
.lx-pn span { font: 12px var(--mono); color: var(--faint); text-transform: uppercase; letter-spacing: .05em; }
.lx-pn b { display: flex; align-items: center; gap: 10px; font-family: var(--head); font-size: 17px; }
.lx-pn b svg { color: var(--lime); flex: none; }

/* ---------- hub */
.learn .lx-hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr); gap: 28px; align-items: center; position: relative; }
.lx-hero h1 { font-size: clamp(32px, 4.6vw, 50px); }
.lx-cta { margin-top: 24px; }
.guide .lx-cta a.btn { color: #0b1200; text-decoration: none; }
.lx-hero-fig { margin: 0; }
.lx-hero-fig svg { filter: drop-shadow(0 30px 60px rgba(0, 0, 0, .5)); }
.learn h2 + .lcards { margin-top: 16px; }
.lcards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.lcard { position: relative; display: grid; gap: 8px; align-content: start; padding: 20px; border: 1px solid var(--line2); border-radius: 16px; background: linear-gradient(180deg, rgba(255, 255, 255, .045), rgba(255, 255, 255, .015));
  color: var(--text); text-decoration: none; transition: border-color .15s, transform .25s var(--ease), box-shadow .25s var(--ease); overflow: hidden; }
.lcard:hover, .lcard:focus-visible { border-color: var(--lime); transform: translateY(-3px); box-shadow: 0 18px 40px -18px rgba(220, 255, 60, .35); }
.lcard i { display: grid; place-items: center; width: 46px; height: 46px; border-radius: 12px; color: var(--lime); background: rgba(220, 255, 60, .08); border: 1px solid rgba(220, 255, 60, .25); }
.lcard em { position: absolute; top: 14px; right: 18px; font: 500 30px var(--head); font-style: normal; color: rgba(255, 255, 255, .07); letter-spacing: -.02em; }
.lcard b { font-family: var(--head); font-size: 18px; margin-top: 6px; }
.lcard span { color: var(--muted); font-size: 14.5px; line-height: 1.5; }
.lcard small { font: 12px var(--mono); color: var(--faint); text-transform: uppercase; letter-spacing: .05em; margin-top: 4px; }
.lcard.lx-first { background: radial-gradient(80% 120% at 100% 0%, rgba(220, 255, 60, .12), transparent 60%), linear-gradient(180deg, rgba(255, 255, 255, .05), rgba(255, 255, 255, .015)); border-color: rgba(220, 255, 60, .35); }
.lcard.lx-first b { font-size: 22px; }
.lcard.lx-first small { color: var(--lime); }
.lx-tools { display: grid; grid-template-columns: repeat(auto-fit, minmax(156px, 1fr)); gap: 10px; margin-top: 14px; }
.lx-tools a { display: grid; gap: 4px; padding: 14px 16px; border-radius: 12px; border: 1px dashed rgba(95, 224, 200, .35); text-decoration: none; color: var(--text); background: rgba(95, 224, 200, .04); transition: border-color .15s, background .15s; }
.lx-tools a:hover { border-style: solid; border-color: var(--teal); background: rgba(95, 224, 200, .08); }
.lx-tools b { font-family: var(--head); font-size: 15.5px; }
.lx-tools b::after { content: " →"; color: var(--teal); }
.lx-tools span { font-size: 13.5px; color: var(--muted); line-height: 1.45; }

/* ---------- figures */
.lx { margin: 26px 0 8px; }
.lx > svg, .lx svg { display: block; width: 100%; height: auto; }
.lx:not(.lx-photo):not(.lx-hero-fig) { padding: 18px; border-radius: 16px; border: 1px solid var(--line2); background: radial-gradient(100% 80% at 50% 0%, rgba(255, 255, 255, .035), transparent 70%), #080d0f; }
.lx figcaption { margin-top: 12px; font-size: 13.5px; color: var(--faint); line-height: 1.5; }
.lx figcaption a { color: var(--muted); }
.lx-photo img { display: block; width: 100%; height: auto; border-radius: 16px; border: 1px solid var(--line2); filter: contrast(1.05); }
.lx-photo picture { display: block; position: relative; }
.lx-photo picture::after { content: ""; position: absolute; inset: 0; border-radius: 16px; pointer-events: none; background: linear-gradient(180deg, transparent 60%, rgba(5, 8, 10, .35)); }

.lx text { font-family: Inter, system-ui, sans-serif; fill: var(--muted); }
.lx .lx-tl { font-size: 11.5px; fill: var(--faint); font-family: var(--mono); }
.lx .lx-tl.lime, .lx .lx-lab.lime { fill: var(--lime); }
.lx .lx-tl.teal { fill: var(--teal); }
.lx .lx-lab { font-size: 13px; fill: #c9d4d0; }
.lx .lx-big { font-family: var(--head); font-size: 17px; font-weight: 600; fill: var(--text); }
.lx .lx-note { font-size: 11px; fill: #55615d; font-family: var(--mono); }
.lx .lx-colh { font: 600 12px var(--mono); letter-spacing: .06em; text-transform: uppercase; fill: var(--faint); }
.lx-lead { stroke: #75827e; stroke-width: 1; stroke-dasharray: 3 3; fill: none; }
.lx-strata { fill: none; stroke: rgba(255, 255, 255, .05); stroke-width: 1; }
.lx-hole { stroke: #e6ece9; stroke-width: 2.4; fill: none; stroke-linecap: round; }
.lx-hole2 { stroke: #9aa7a3; stroke-width: 1.6; stroke-dasharray: 5 5; fill: none; opacity: .6; }
.lx-tick { stroke: #9aa7a3; stroke-width: 1.2; }
.lx-vein-l { font-family: var(--mono); }
.lx-section .lx-int, .lx-section .lx-rig { transition: opacity .2s; outline: none; }

/* hero drawing animation */
@media (prefers-reduced-motion: no-preference) {
  .lx-hero-fig .lx-draw { stroke-dasharray: 1; stroke-dashoffset: 1; animation: lx-draw 1.8s .3s var(--ease) forwards; }
  .lx-hero-fig .lx-int, .lx-hero-fig .lx-tick, .lx-hero-fig .lx-tl { opacity: 0; animation: lx-fade .6s forwards; }
  .lx-hero-fig .lx-tick, .lx-hero-fig .lx-tl { animation-delay: 1.2s; }
  .lx-hero-fig .lx-int { animation-delay: 1.9s; }
  .lx-hero-fig .lx-int:last-of-type { animation-delay: 2.3s; }
  @keyframes lx-draw { to { stroke-dashoffset: 0; } }
  @keyframes lx-fade { to { opacity: 1; } }
}

/* linked highlights (decode, ladder, release) */
.lx-sync .eg b[data-k], .lx-sync li[data-k] { cursor: default; }
.lx-sync .eg b.on { background: var(--lime); color: #0b1200; }
.lx-sync li[data-k] { border-radius: 8px; transition: background .15s; margin-left: -8px; padding: 4px 8px 4px 30px !important; }
.lx-sync li[data-k]::before { left: 11px !important; top: calc(4px + .62em) !important; }
.lx-sync li.on { background: rgba(220, 255, 60, .08); }
.lx-sync:has(.on) .lx-section [data-k]:not(.on) { opacity: .28; }
.lx-section [data-k] { cursor: pointer; }

/* interactive controls */
.lx-w { color: var(--text); }
.lx-ctl { display: flex; flex-wrap: wrap; gap: 10px 22px; align-items: center; margin-bottom: 14px; font-size: 14px; color: var(--muted); }
.lx-ctl label { display: inline-flex; align-items: center; gap: 8px; }
.lx-ctl output { font: 500 13px var(--mono); color: var(--lime); min-width: 58px; }
.lx-ctl input[type=number], .lx-ctl select { background: #0d1416; color: var(--text); border: 1px solid var(--line2); border-radius: 9px; padding: 7px 10px; font: 500 14px var(--mono); }
.lx-ctl input[type=number] { width: 92px; }
.lx-ctl input[type=number]:focus, .lx-ctl select:focus { border-color: var(--lime); outline: none; }
.lx input[type=range] { accent-color: var(--lime); width: 150px; }
.lx input[type=checkbox] { accent-color: var(--lime); width: 17px; height: 17px; }
.lx-head { margin-top: 14px !important; font-size: 15px; color: #c9d4d0 !important; }
.lx-head b { color: var(--lime); font-family: var(--mono); font-weight: 500; }
.lx-head span { display: block; margin-top: 4px; font-size: 13px; color: var(--faint); }
.lx-ns { color: var(--faint) !important; font-size: 14px; }
.lx .lx-bg { fill: #0b1112; }
.lx .lx-vein { fill: rgba(220, 255, 60, .16); stroke: rgba(220, 255, 60, .5); }
.lx .lx-hit { stroke: var(--lime); stroke-width: 7; stroke-linecap: round; }
.lx .lx-tw-line { stroke: var(--teal); stroke-width: 2; marker-start: none; }
.lx-tw { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); gap: 16px; align-items: center; }
.lx-out { display: grid; gap: 4px; padding: 18px; border-radius: 12px; background: rgba(95, 224, 200, .06); border: 1px solid rgba(95, 224, 200, .25); }
.lx-out span { font: 12px var(--mono); text-transform: uppercase; letter-spacing: .05em; color: var(--faint); }
.lx-out b { font: 600 34px var(--head); color: var(--teal); }
.lx-out em { font-style: normal; font-size: 13.5px; color: var(--muted); line-height: 1.45; }
.lx .lx-axis { stroke: #3a4644; stroke-width: 1; }
.lx .lx-bar { fill: #3d4a47; }
.lx .lx-bar.up { fill: var(--lime); }
.lx .lx-bar.dil { fill: #8a9a5a; }
.lx .lx-band { fill: rgba(220, 255, 60, .08); stroke: rgba(220, 255, 60, .35); stroke-dasharray: 4 3; }
.lx .lx-band2 { fill: rgba(255, 255, 255, .07); stroke: rgba(255, 255, 255, .5); }
.lx .lx-cutline { stroke: var(--lime); stroke-width: 1.2; stroke-dasharray: 5 4; }
.lx .lx-curve { fill: none; stroke-width: 2.4; }
.lx .lx-curve.t, .lx .lx-dot.t { stroke: var(--teal); }
.lx .lx-curve.g, .lx .lx-dot.g { stroke: var(--lime); }
.lx .lx-dot { fill: #080d0f; stroke-width: 2.4; }
.lx-gt { display: grid; grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr); gap: 16px; align-items: center; }
.lx-stats { display: grid; gap: 10px; }
.lx-stats div { padding: 12px 14px; border-radius: 12px; border: 1px solid var(--line2); background: rgba(255, 255, 255, .03); display: grid; gap: 2px; }
.lx-stats span { font: 11.5px var(--mono); text-transform: uppercase; letter-spacing: .05em; color: var(--faint); }
.lx-stats b { font: 600 22px var(--head); }
.lx-stats div:nth-child(1) b { color: var(--teal); }
.lx-stats div:nth-child(2) b { color: var(--lime); }
.lx-cl { display: grid; gap: 6px; }
.lx-cl label { display: flex; gap: 12px; align-items: flex-start; padding: 10px 12px; border-radius: 10px; border: 1px solid var(--line); cursor: pointer; transition: border-color .15s, background .15s; color: #c9d4d0; }
.lx-cl label:hover { border-color: var(--line2); }
.lx-cl input { margin-top: 3px; flex: none; }
.lx-cl label:has(input:checked) { border-color: rgba(220, 255, 60, .4); background: rgba(220, 255, 60, .05); color: var(--text); }
.lx-conv { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.lx-conv section { padding: 14px; border-radius: 12px; border: 1px solid var(--line); background: rgba(255, 255, 255, .02); }
.lx-conv h3 { margin: 0 0 10px; font-size: 14px; color: var(--text); }
.lx-conv .lx-ctl { gap: 8px; margin-bottom: 8px; }
.lx-conv input[type=number] { width: 84px; }
.lx-conv dl { margin: 0; display: grid; gap: 4px; }
.lx-conv dl div { display: flex; justify-content: space-between; gap: 10px; padding: 5px 0; border-bottom: 1px solid var(--line); font-size: 13.5px; }
.lx-conv dt { color: var(--faint); }
.lx-conv dd { margin: 0; font: 500 14px var(--mono); color: var(--lime); }
.lx-conv .lx-big { font-size: 15px; color: #c9d4d0; margin-top: 6px; }
.lx-conv .lx-big b { color: var(--lime); font-family: var(--mono); font-weight: 500; display: block; font-size: 18px; margin-top: 2px; }
.lx-conv .lx-big span { display: block; font-size: 12.5px; color: var(--faint); }

/* core sizes, core tray */
.lx .lx-holec { fill: #0d1416; stroke: #5d6a66; stroke-dasharray: 3 3; }
.lx-size { outline: none; }
.lx .lx-tray { fill: #2b221a; stroke: #4a3a2b; }
.lx .lx-trayrow { fill: #1c1612; }
.lx .lx-cut { stroke: rgba(255, 255, 255, .25); stroke-width: 1; stroke-dasharray: 2 3; }
.lx .lx-samp { fill: transparent; stroke: none; cursor: pointer; outline: none; }
.lx .lx-samp.on { fill: rgba(220, 255, 60, .07); }
.lx .lx-samp.hot { fill: rgba(220, 255, 60, .16); }
.lx .lx-samp:hover, .lx .lx-samp.sel, .lx .lx-samp:focus { stroke: var(--lime); stroke-width: 1.5; }
.lx-tip-wrap { position: relative; }
.lx-tip { position: absolute; width: 170px; text-align: center; padding: 6px 8px; border-radius: 8px; background: var(--lime); color: #0b1200; font: 500 12.5px var(--mono); pointer-events: none; }

/* ladder */
.lx-ladder { display: grid; gap: 14px; }
.lx-ladder-tip { min-height: 92px; padding: 14px 16px; border-radius: 12px; background: rgba(220, 255, 60, .05); border: 1px solid rgba(220, 255, 60, .2); }
.lx .lx-box rect { stroke-width: 1.2; transition: fill .15s, stroke .15s; }
.lx .lx-box text { font: 600 14.5px var(--head); fill: var(--text); pointer-events: none; }
.lx .lx-box { cursor: pointer; outline: none; }
.lx .lx-b-ex rect { fill: #121a1c; stroke: #3a4644; }
.lx .lx-b-res rect { fill: rgba(95, 224, 200, .08); stroke: rgba(95, 224, 200, .45); }
.lx .lx-b-rsv rect { fill: rgba(220, 255, 60, .08); stroke: rgba(220, 255, 60, .45); }
.lx .lx-box.on rect, .lx .lx-box:hover rect { fill: rgba(220, 255, 60, .22); stroke: var(--lime); }
.lx .lx-arrow { stroke: #75827e; stroke-width: 1.4; }
.lx .lx-arrow.dash { stroke-dasharray: 4 4; }
.lx .lx-mf { fill: rgba(255, 179, 71, .06); stroke: rgba(255, 179, 71, .35); stroke-dasharray: 4 4; }
.lx-ladder-tip p { display: none; margin: 0 !important; font-size: 14.5px; line-height: 1.55; }
.lx-ladder-tip p.on { display: block; }
.lx-ladder-tip b { display: block; font: 600 20px var(--head); color: var(--lime); margin-bottom: 6px; }

/* release anatomy */
.lx-release { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: 20px; align-items: center; }
.lx .lx-page { fill: #0f1618; stroke: var(--line2); }
.lx .lx-rbox { fill: rgba(255, 255, 255, .02); stroke: rgba(255, 255, 255, .1); transition: fill .15s, stroke .15s; }
.lx .lx-rb { cursor: pointer; outline: none; }
.lx .lx-rb.on .lx-rbox, .lx .lx-rb:hover .lx-rbox { fill: rgba(220, 255, 60, .08); stroke: var(--lime); }
.lx .lx-num { fill: #0b1200; stroke: var(--lime); }
.lx .lx-rb.on .lx-num { fill: var(--lime); }
.lx .lx-numt { font: 600 11px var(--mono); fill: var(--lime); }
.lx .lx-rb.on .lx-numt { fill: #0b1200; }
.lx-rlist { counter-reset: r; display: grid; gap: 6px; }
.lx-rlist li { counter-increment: r; display: grid; grid-template-columns: 26px 1fr; column-gap: 10px; padding: 8px 10px; border-radius: 10px; cursor: pointer; transition: background .15s; outline: none; }
.lx-rlist li::before { content: counter(r); grid-row: span 2; width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; font: 600 11px var(--mono); color: var(--lime); border: 1px solid var(--lime); }
.lx-rlist li.on { background: rgba(220, 255, 60, .07); }
.lx-rlist li.on::before { background: var(--lime); color: #0b1200; }
.lx-rlist b { font-family: var(--head); font-size: 15px; }
.lx-rlist span { font-size: 13.5px; color: var(--muted); line-height: 1.45; }

/* Form 43-101F1 */
.lx-f1 { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 6px; }
.lx-f1 li { display: grid; grid-template-columns: 26px 1fr; gap: 8px; align-items: start; padding: 8px 10px; border-radius: 9px; font-size: 12.5px; line-height: 1.35; color: #c9d4d0;
  background: color-mix(in srgb, var(--c) 9%, transparent); border: 1px solid color-mix(in srgb, var(--c) 22%, transparent); }
.lx-f1 li b { font: 600 12px var(--mono); color: var(--c); }
.lx-f1 li.key { border-color: var(--c); box-shadow: 0 0 0 1px var(--c) inset; }
.g-start { --c: #c9d4d0; } .g-prop { --c: #8fb8ff; } .g-geo { --c: #5fe0c8; } .g-data { --c: #b49cff; } .g-est { --c: #dcff3c; } .g-dev { --c: #ffb347; } .g-end { --c: #ff7a90; }
.lx-legend { display: flex; flex-wrap: wrap; gap: 6px 16px; margin-top: 12px; font-size: 12.5px; color: var(--muted); }
.lx-legend span { display: inline-flex; align-items: center; gap: 6px; }
.lx-legend i { width: 10px; height: 10px; border-radius: 3px; background: var(--c); }

@media (max-width: 900px) {
  .learn .lx-hero { grid-template-columns: 1fr; }
  .lcards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lx-conv { grid-template-columns: 1fr; }
  .lx-ladder, .lx-release, .lx-tw, .lx-gt { grid-template-columns: 1fr; }
  .lx-release svg { max-width: 360px; margin: 0 auto; }
}
@media (max-width: 640px) {
  .lcards { grid-template-columns: 1fr; }
  .lx:not(.lx-photo):not(.lx-hero-fig) { padding: 12px; margin-left: -4px; margin-right: -4px; }
  .lx-pn { grid-template-columns: 1fr; }
  .lx-pn a.next { grid-column: auto; }
  .lx input[type=range] { width: 120px; }
  .lx-series a { width: 28px; height: 28px; }
}
.learn [hidden] { display: none !important; }