/* Quiet, native learning tools. Animation communicates a state; it never loops. */
html:has(.learning-page){scroll-behavior:auto}
.learning-page,.learning-gateway{--learn-soft:color-mix(in srgb,var(--brand) 9%,var(--card))}
.learning-page [hidden]{display:none!important}.learning-intro{padding-top:64px;padding-bottom:48px;text-align:center}.learning-intro h1{font-size:clamp(2.4rem,5.5vw,4.5rem);line-height:1.08;letter-spacing:-.055em;margin:14px 0 22px}.learning-intro h1 span{color:var(--brand)}.learning-intro>p:not(.eyebrow){max-width:680px;margin:20px auto;color:var(--muted);font-size:1.07rem}.learning-nav{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-top:26px}.learning-nav a{padding:10px 16px;min-height:44px;border:1px solid var(--line);border-radius:99px;text-decoration:none;font-size:.85rem;font-weight:700;background:var(--card)}.learning-nav a[aria-current="page"]{background:var(--brand);color:var(--paper)}
.gateway-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}.gateway-grid>a{min-width:0;display:block;padding:28px;border:1px solid var(--line);border-radius:24px;background:var(--card);text-decoration:none;transition:transform .2s,border-color .2s}.gateway-grid>a:hover{border-color:var(--brand);transform:translateY(-3px)}.gateway-grid h3{font-size:1.25rem;letter-spacing:-.035em;margin:14px 0}.gateway-grid p{color:var(--muted);font-size:.94rem}.gateway-grid strong{color:var(--brand);font-size:.85rem}.gateway-visual{display:flex;gap:20px;align-items:center;height:88px;margin:0 0 16px}.gateway-visual i{font-style:normal;background:var(--learn-soft);color:var(--brand);border:1px solid var(--line);display:grid;place-items:center;width:46px;height:46px;border-radius:14px;font-weight:800}.map-visual i{border-radius:50%;width:25px;height:25px;position:relative}.map-visual i:not(:last-child):after{content:'';width:21px;height:2px;background:var(--brand);position:absolute;left:24px}.map-visual i:nth-child(2){width:40px;height:40px}.map-visual i:nth-child(2):after{left:39px}.choice-visual i:last-child{background:var(--brand);color:var(--paper)}.route-visual i:nth-child(2){border:none;background:transparent;width:20px}
.map-lanes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.map-lane{min-width:0;background:var(--card);padding:26px;border:1px solid var(--line);border-radius:24px}.map-lane h2{font-size:1.15rem;line-height:1.25;letter-spacing:-.03em;margin:14px 0 25px}.map-lane .eyebrow{font-size:.62rem}.map-lane ol{list-style:none;padding:0;margin:0}.map-lane li{position:relative;padding-bottom:12px}.map-lane li:not(:last-child):before{content:'';width:2px;background:var(--line);position:absolute;left:21px;top:25px;bottom:-10px}.map-lane a{display:grid;grid-template-columns:16px 1fr 12px;gap:4px 12px;align-items:center;min-height:84px;padding:12px 14px;border:1px solid transparent;border-radius:14px;text-decoration:none;position:relative;background:var(--card);transition:background .2s,border-color .2s}.map-lane a strong{font-size:.94rem}.map-lane a small{grid-column:2;color:var(--muted);font-size:.77rem;line-height:1.45}.map-lane a>span:last-child{grid-column:3;grid-row:1/3;color:var(--brand)}.concept-dot{width:13px;height:13px;background:var(--paper);border:2px solid var(--brand);border-radius:50%}.map-lane a[data-selected]{border-color:var(--brand);background:var(--learn-soft)}.map-lane a[data-selected] .concept-dot{background:var(--brand)}
.concept-detail{display:grid;grid-template-columns:2fr 1fr;gap:34px;padding:34px;background:var(--card);border:1px solid var(--line);border-radius:24px;margin-top:24px;scroll-margin-top:100px;animation:learning-reveal .25s ease-out}.concept-detail h2{font-size:1.8rem;line-height:1.18;letter-spacing:-.04em;margin:10px 0 20px}.concept-detail p{color:var(--muted)}.concept-detail aside{padding:24px;border-radius:18px;background:var(--learn-soft);align-self:center}.concept-detail aside p{color:var(--ink);font-size:1.15rem;line-height:1.55}.concept-detail aside a{font-size:.8rem;color:var(--brand)}.concept-relation{display:flex;gap:12px;align-items:center;flex-wrap:wrap;padding:15px 0;font-size:.8rem;font-weight:750;color:var(--ink)}.concept-relation i{font-style:normal;color:var(--brand)}
.learning-note{font-size:.81rem;color:var(--muted);line-height:1.65;margin:20px 0}.learning-actions{display:flex;align-items:center;flex-wrap:wrap;gap:14px;margin-top:22px}.learning-actions a:not(.button),.text-action{color:var(--brand);font-size:.9rem;font-weight:750;display:inline-block;text-underline-offset:4px}.learning-next{max-width:850px}.learning-next h2{font-size:1.8rem;letter-spacing:-.035em;line-height:1.2}.learning-next>p{color:var(--muted)}.learning-next .text-action{margin:18px 0 0 22px}.learning-button,.scenario-answers button{font:700 .9rem/1.5 Inter,ui-sans-serif,system-ui,sans-serif;color:var(--ink);background:var(--card);border:1px solid var(--line);border-radius:14px;padding:12px 16px;min-height:48px;cursor:pointer;transition:background .2s,border-color .2s}.learning-button:hover,.scenario-answers button:hover{border-color:var(--brand)}.learning-button:disabled{opacity:.45;cursor:default}.learning-page a:focus-visible,.learning-page button:focus-visible,.learning-page select:focus-visible{outline:3px solid var(--accent);outline-offset:4px}
.practice-toolbar{display:grid;grid-template-columns:1fr 1fr auto;gap:24px;align-items:end;padding:24px;background:var(--card);border:1px solid var(--line);border-radius:20px}.practice-toolbar label{font-size:.8rem;font-weight:700;display:grid;gap:8px}.practice-toolbar select{font:inherit;color:var(--ink);background:var(--paper);padding:12px;border:1px solid var(--line);border-radius:12px;min-height:48px;width:100%;min-width:0}.practice-toolbar>div{font-size:.8rem;color:var(--muted)}.practice-toolbar progress{display:block;width:100%;height:8px;margin:14px 0 10px;accent-color:var(--brand)}.practice-scenario{padding:32px;border:1px solid var(--line);border-radius:24px;background:var(--card);margin:26px 0;animation:learning-reveal .25s ease-out;scroll-margin-top:100px}.predict-panel h2{font-size:clamp(1.4rem,2.8vw,2rem);line-height:1.3;letter-spacing:-.035em;scroll-margin-top:110px;max-width:850px}.scenario-answers{display:grid;gap:12px;margin:24px 0;max-width:850px}.scenario-answers button{text-align:left;background:var(--paper)}.scenario-answers button[aria-pressed="true"]{border-color:var(--brand);background:var(--learn-soft)}.scenario-result{padding:18px;border-left:3px solid var(--line);background:var(--paper);border-radius:0 12px 12px 0;max-width:850px;color:var(--muted)}.scenario-result[data-correct="true"]{border-color:var(--brand);color:var(--ink)}.scenario-result[data-correct="false"]{border-color:var(--accent);color:var(--ink)}.scenario-reference{max-width:850px}.scenario-reference summary{cursor:pointer;color:var(--brand);font-weight:700;padding:12px 0}.scenario-reference p{font-size:.9rem;color:var(--muted)}.practice-model{max-width:900px;margin:38px auto;border-top:1px solid var(--line);padding-top:24px;--lab-soft:var(--learn-soft);--lab-focus:var(--brand)}.practice-model .article-experiment{margin:0}.practice-explain{border-top:1px solid var(--line);padding-top:20px;max-width:850px}.practice-explain p:not(.eyebrow){color:var(--muted);font-size:.95rem}
.troubleshoot-workspace{max-width:900px}.problem-tool{border:1px solid var(--line);background:var(--card);border-radius:24px;padding:34px}.problem-tool h2{font-size:1.8rem;line-height:1.3;letter-spacing:-.035em;outline:none}.problem-trail{display:flex;flex-wrap:wrap;list-style:none;padding:0;gap:8px;margin:20px 0}.problem-trail li{font-size:.74rem;color:var(--muted);border:1px solid var(--line);border-radius:8px;padding:7px 10px}.problem-trail li:not(:last-child):after{content:' →';color:var(--brand)}.problem-choices{display:grid;gap:12px;margin:24px 0}.problem-choices button{text-align:left;background:var(--paper)}.problem-result ol{padding-left:24px}.problem-result li{padding-left:7px;margin:16px 0;color:var(--ink);font-size:.98rem}.problem-fallback{margin-top:26px;padding:22px;border:1px solid var(--line);border-radius:18px;background:var(--card)}.problem-fallback summary{font-weight:700;color:var(--brand);cursor:pointer}.problem-fallback section{margin:28px 0;border-top:1px solid var(--line);padding-top:10px}.problem-fallback section p,.problem-fallback li{color:var(--muted);font-size:.9rem}.about-learning{max-width:820px;padding-bottom:70px}.about-learning section{border-top:1px solid var(--line);padding:24px 0}.about-learning h2{font-size:1.6rem;line-height:1.25;letter-spacing:-.035em}.about-learning p{color:var(--muted)}.about-learning a{color:var(--brand)}
.resource-provenance{padding:18px 20px;border:1px solid var(--line);border-radius:14px;background:var(--card);margin:30px 0;font:400 .85rem/1.65 Inter,ui-sans-serif,system-ui,sans-serif}.resource-provenance summary{color:var(--muted);font-weight:700;cursor:pointer}.resource-provenance p{margin:12px 0;color:var(--muted)}.resource-provenance time{font-variant-numeric:tabular-nums}.lesson-byline{font-size:.8rem;color:var(--muted);margin:18px 0}.resource-type{color:var(--muted);font-size:.72rem;letter-spacing:0;text-transform:none}.lesson-next{margin:32px 0;padding:24px;border:1px solid var(--line);border-radius:20px;font-family:Inter,ui-sans-serif,system-ui,sans-serif;background:var(--card)}.lesson-next h2{margin:0!important;font-size:1.2rem!important}.lesson-next p{font-size:.9rem;color:var(--muted)}.lesson-next ul{font-size:.9rem;padding-left:20px}.lesson-next li{margin:12px 0}.card .resource-type{display:block;margin-bottom:0}
@keyframes learning-reveal{from{opacity:.3;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}
@media(max-width:850px){.gateway-grid,.map-lanes{grid-template-columns:1fr}.gateway-grid>a{padding:24px}.gateway-visual{height:64px}.map-lane ol{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.map-lane li:before{display:none}.map-lane li{padding:0}.concept-detail{grid-template-columns:1fr}.practice-toolbar{grid-template-columns:1fr auto}.practice-toolbar>div{grid-row:2;grid-column:1/-1}.practice-scenario{padding:24px}.learning-intro{padding-top:44px}.learning-next .text-action{margin:18px 0 0;display:block}}
@media(max-width:520px){.map-lane ol{grid-template-columns:1fr}.learning-intro h1{font-size:2.45rem}.learning-intro>p:not(.eyebrow){font-size:.97rem}.learning-nav{gap:8px}.learning-nav a{font-size:.78rem;padding:10px 12px}.concept-detail,.problem-tool{padding:22px}.concept-detail h2,.problem-tool h2{font-size:1.5rem}.practice-scenario{padding:20px}.practice-toolbar{padding:18px;gap:16px;grid-template-columns:1fr}.practice-toolbar>div{grid-row:auto}.practice-toolbar .learning-button{justify-self:start}.practice-model{margin:28px -6px}.concept-relation{gap:8px}.learning-actions .button{width:100%}.learning-actions{align-items:start}.learning-intro{padding-bottom:34px}.concept-detail aside{padding:18px}.learning-next h2{font-size:1.5rem}}
@media(prefers-reduced-motion:reduce){.learning-page *, .learning-gateway *{animation:none!important;transition:none!important}}