.learn{background:var(--paper);color:var(--ink);font-family:var(--font-sans);-webkit-font-smoothing:antialiased;min-height:100dvh}html:has(.learn){scroll-behavior:smooth}.learn .hero-signin{color:#fff;background:#0e3543;box-shadow:0 1px 2px #0e35431f}.learn .hero-signin:hover{background:#14485a;box-shadow:0 8px 22px -8px #0e354373}.learn-shell{grid-template-columns:minmax(0,1fr) 304px;align-items:start;gap:clamp(36px,5vw,72px);max-width:1180px;margin:0 auto;padding:clamp(12px,3vw,28px) clamp(20px,5vw,40px) 120px;display:grid}.learn-main{min-width:0}.learn-aside{position:sticky;top:28px}@media (max-width:900px){.learn-shell{grid-template-columns:1fr;gap:0}.learn-aside{display:none}}.learn-crumbs{color:var(--ink-55);flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:22px;font-size:13px;display:flex}.learn-crumbs a{color:var(--ink-55)}.learn-crumbs a:hover{color:var(--ink)}.learn-crumbs span{color:var(--ink-40)}.learn-title{font-family:var(--font-display);letter-spacing:var(--tracking-tight);color:var(--ink);margin:2px 0 26px;font-size:clamp(38px,5.4vw,62px);font-weight:800;line-height:1.04}.learn-hub-hero{max-width:780px;padding-top:clamp(18px,3vw,34px)}.learn-hero-actions{flex-wrap:wrap;gap:12px;margin-top:18px;display:flex}.learn-count{border:1px solid var(--ink-08);background:var(--paper-raised);min-height:34px;color:var(--ink-70);border-radius:20px;align-items:center;padding:6px 12px;font-size:13px;font-weight:700;display:inline-flex}.learn-primary-cta{color:#fff;min-width:190px;height:45px;transition:transform var(--dur-micro) var(--ease), box-shadow var(--dur-micro) var(--ease), opacity var(--dur-micro) var(--ease);background:#0e3543;border-radius:20px;justify-content:center;align-items:center;gap:10px;padding:0 18px 0 22px;font-size:15px;font-weight:700;text-decoration:none;display:inline-flex;box-shadow:0 10px 30px -16px #0e3543a6}.learn-primary-cta:hover{color:#fff;opacity:.96;transform:translateY(-1px);box-shadow:0 14px 34px -16px #0e3543ad}.learn-primary-cta-icon{background:url(/icons/arrow-right-white.svg) 50%/contain no-repeat;flex:none;width:15px;height:12px;display:inline-block}.learn-hub-stats{flex-wrap:wrap;gap:10px;margin-top:22px;display:flex}.learn-hub-stats span{border:1px solid var(--ink-08);background:var(--paper-raised);min-height:34px;color:var(--ink-70);border-radius:20px;align-items:center;padding:6px 12px;font-size:13px;font-weight:700;display:inline-flex}.learn-hub-stats strong{color:var(--ink);margin-right:5px}.learn-section-row{justify-content:space-between;align-items:end;gap:18px;margin-bottom:22px;display:flex}.learn-section-row .learn-section-head{margin-bottom:0}.learn-subject-grid,.learn-concept-grid{grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px;display:grid}.learn-subject-card,.learn-concept-card{background:var(--paper-raised);border:1px solid var(--ink-07);height:100%;min-height:190px;box-shadow:var(--shadow-card);color:inherit;transition:transform var(--dur-std) var(--ease), box-shadow var(--dur-std) var(--ease);border-radius:20px;flex-direction:column;gap:12px;padding:20px;text-decoration:none;display:flex}.learn-subject-card{min-height:164px}.learn-subject-card:hover,.learn-concept-card:hover{box-shadow:var(--shadow-float);transform:translateY(-3px)}.learn-card-summary{color:var(--ink-70);-webkit-line-clamp:3;-webkit-box-orient:vertical;font-size:14.5px;line-height:1.55;display:-webkit-box;overflow:hidden}.learn-subject-card .learn-card-summary{-webkit-line-clamp:2}.learn-concept-card .learn-related-meta,.learn-subject-card .learn-related-meta{margin-top:auto}.learn-filterbar{grid-template-columns:minmax(240px,1fr) repeat(3,minmax(160px,.36fr));align-items:end;gap:12px;margin-bottom:22px;display:grid}.learn-browser{scroll-margin-top:28px}.learn-filterbar label{flex-direction:column;gap:6px;min-width:0;display:flex}.learn-filterbar label span{letter-spacing:.04em;text-transform:uppercase;color:var(--ink-55);font-size:12px;font-weight:700}.learn-filterbar input,.learn-filterbar select{border:1px solid var(--ink-08);background:var(--paper-raised);width:100%;height:44px;color:var(--ink);font:inherit;box-shadow:var(--shadow-card);border-radius:20px;outline:none;padding:0 14px;font-size:14px}.learn-filterbar input:focus,.learn-filterbar select:focus{border-color:#0e354352}.learn-figure{margin:34px 0}.learn-image{border:1px solid var(--ink-08);width:100%;height:auto;box-shadow:var(--shadow-card);border-radius:20px}.learn-figure figcaption{color:var(--ink-55);margin-top:8px;font-size:13px}@media (max-width:900px){.learn-filterbar{grid-template-columns:1fr}.learn-section-row{flex-direction:column;align-items:start}}.learn-meta{flex-wrap:wrap;align-items:stretch;gap:12px;display:flex}.learn-chip{background:var(--paper-raised);border:1px solid var(--ink-08);box-shadow:var(--shadow-card);border-radius:20px;align-items:center;gap:10px;padding:11px 15px;display:inline-flex}.learn-chip-label{color:var(--ink-80);white-space:nowrap;font-size:13.5px;font-weight:600}.learn-chip-svg{opacity:.85;width:16px;height:16px;display:block}.learn-dots{gap:4px;display:inline-flex}.learn-dot{border:1.5px solid var(--ink);background:0 0;border-radius:999px;width:9px;height:9px}.learn-dot.on{background:var(--ink)}.learn-freq-chip{gap:12px}.learn-why{max-width:760px;color:var(--ai-content-blockquote-text);background:var(--ai-content-blockquote-bg);border-left:3px solid var(--ai-content-blockquote-border);border-radius:0 20px 20px 0;margin-top:26px;padding:12px 16px;font-weight:500}.learn-why-label{letter-spacing:.08em;text-transform:uppercase;color:var(--ink-55);margin-bottom:5px;font-size:12px;font-weight:700;display:block}.learn-why p{color:inherit;margin:0;font-size:15.5px;line-height:1.55}.learn-section{margin-top:clamp(46px,6vw,76px)}.learn-quick-section{margin-top:clamp(34px,4vw,52px)}.learn-section-head{font-family:var(--font-display);letter-spacing:-.018em;color:var(--ink);margin:0 0 22px;font-size:clamp(22px,2.4vw,30px);font-weight:800}.learn-section-eyebrow{font-size:var(--fs-eyebrow);letter-spacing:var(--tracking-eyebrow);text-transform:uppercase;color:var(--gold);margin-bottom:4px;font-weight:700;display:block}.learn-lede.avi-ai-content{font-size:clamp(17px,1.4vw,20px)}.learn-lede.avi-ai-content p{color:var(--ink-80);line-height:1.62}.learn-prose.avi-ai-content{font-size:clamp(16px,1.1vw,18px)}.learn-prose.avi-ai-content p,.learn-prose.avi-ai-content li{line-height:1.72}.learn-points{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:14px;display:grid}.learn-point{background:var(--paper-raised);border:1px solid var(--ink-07);box-shadow:var(--shadow-card);border-radius:20px;align-items:flex-start;gap:14px;padding:18px 20px;display:flex}.learn-point-tick{color:#1f8f5f;background:#2ea06e1f;border-radius:999px;flex:none;place-items:center;width:26px;height:26px;font-size:14px;font-weight:700;display:grid}.learn-point-text{color:var(--ink-80);font-size:15.5px;line-height:1.5}.learn-traps{gap:12px;display:grid}.learn-trap{background:#e79f0214;border:none;border-radius:20px;align-items:flex-start;gap:14px;padding:16px 19px;display:flex}.learn-trap-icon{flex:none;font-size:17px;line-height:1.3}.learn-trap-text{color:var(--ink-90);font-size:15.5px;line-height:1.55}.learn-quiz{gap:18px;display:grid}.learn-qcard{background:var(--paper-raised);border:1px solid var(--ink-08);box-shadow:var(--shadow-card);border-radius:20px;padding:clamp(20px,2.5vw,28px)}.learn-qcard-top{justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px;display:flex}.learn-qnum{letter-spacing:.04em;text-transform:uppercase;color:var(--ink-40);font-size:12.5px;font-weight:700}.learn-qbadge{background:var(--ink-08);color:var(--ink-70);border-radius:999px;padding:4px 11px;font-size:12px;font-weight:700}.learn-qbadge[data-d=Easy]{color:#1f8f5f;background:#2ea06e1f}.learn-qbadge[data-d=Hard]{color:#c0392b;background:#d645451f}.learn-qtext{color:var(--ink);margin-bottom:16px;font-size:17px;font-weight:600;line-height:1.45}.learn-explain{border-top:1px solid var(--ink-08);margin-top:16px;padding-top:16px}.learn-explain-label{letter-spacing:.04em;text-transform:uppercase;color:var(--ink-40);margin-bottom:7px;font-size:12px;font-weight:700}.learn-explain-text{color:var(--ink-80);font-size:15px;line-height:1.6}.learn-post-quiz-cta{background:var(--paper-raised);border:1px solid var(--ink-08);box-shadow:var(--shadow-card);border-radius:20px;margin-top:22px;padding:clamp(20px,2.2vw,26px)}.learn-post-quiz-title{font-family:var(--font-display);color:var(--ink);margin:0 0 6px;font-size:20px;font-weight:800}.learn-post-quiz-text,.learn-post-quiz-trust{max-width:58ch;color:var(--ink-70);margin:0;font-size:15.5px;line-height:1.55}.learn-post-quiz-trust{margin:10px 0 0}.learn-post-quiz-btn{background:var(--ink);color:#fff;height:44px;transition:transform var(--dur-micro) var(--ease), opacity var(--dur-micro) var(--ease);border-radius:20px;justify-content:center;align-items:center;margin-top:18px;padding:0 18px;font-size:14.5px;font-weight:700;display:inline-flex}.learn-post-quiz-btn:hover{opacity:.96;transform:translateY(-1px)}.learn-ai-card{background:var(--paper-raised);border:1px solid var(--ink-08);box-shadow:var(--shadow-card);color:inherit;border-radius:20px;flex-direction:column;gap:16px;padding:clamp(20px,2.5vw,28px);text-decoration:none;display:flex}.learn-ai-card:hover{color:inherit}.learn-ai-messages{flex-direction:column;gap:16px;min-height:190px;margin:0;padding:6px 6px 0;list-style:none;display:flex}.learn-ai-status{align-items:center;gap:8px;padding:4px 0;display:flex}.learn-ai-status-dot{background:var(--text-secondary);border-radius:50%;width:6px;height:6px;animation:1.4s ease-in-out infinite avi-ai-status-shimmer}@keyframes avi-ai-status-shimmer{0%,to{opacity:.45;transform:scale(.9)}50%{opacity:1;transform:scale(1.08)}}.learn-ai-answer{white-space:pre-wrap}.learn-ai-caret{vertical-align:-2px;background:var(--ink);width:2px;height:1.05em;margin-left:1px;animation:1s step-end infinite learn-ai-caret;display:inline-block}@keyframes learn-ai-caret{50%{opacity:0}}.learn-ai-composer{background:var(--input-bg);border:var(--container-border);width:100%}.learn-ai-composer-input{align-items:center;min-height:24px;display:flex}.learn-ai-send{background:var(--ink);color:#fff;border-radius:20px;flex:0 0 36px;order:3;justify-content:center;align-items:center;width:36px;height:36px;margin-left:auto;display:inline-flex}.learn-ai-placeholder{color:#001f3359;font-weight:500}.learn-related{grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px;display:grid}.learn-related-card{background:var(--paper-raised);border:1px solid var(--ink-07);min-height:178px;box-shadow:var(--shadow-card);transition:transform var(--dur-std) var(--ease), box-shadow var(--dur-std) var(--ease);border-radius:20px;flex-direction:column;justify-content:space-between;gap:14px;padding:20px;display:flex}a.learn-related-card:hover{box-shadow:var(--shadow-float);transform:translateY(-3px)}.learn-related-card.disabled{opacity:.65;cursor:default}.learn-related-title{font-family:var(--font-display);color:var(--ink);font-size:18px;font-weight:700;line-height:1.2}.learn-related-foot{flex-direction:column;gap:8px;display:flex}.learn-related-meta-list{flex-wrap:wrap;gap:6px;display:flex}.learn-related-meta-list span{max-width:100%;min-height:24px;color:var(--ink-55);background:var(--ink-07);white-space:nowrap;text-overflow:ellipsis;border-radius:999px;align-items:center;padding:4px 9px;font-size:12px;font-weight:600;display:inline-flex;overflow:hidden}.learn-related-frequency{flex-direction:column;gap:6px;display:flex}.learn-related-frequency span{color:var(--ink-55);font-size:11.5px;font-weight:700}.learn-related-meta{color:#0e3543;align-items:center;gap:7px;font-size:12.5px;font-weight:600;display:inline-flex}.learn-related-meta>span{width:13px;height:9px;transition:transform var(--dur-micro) var(--ease);background:url(/landing/forward-arrow.svg) 50%/contain no-repeat}a:hover .learn-related-meta>span{transform:translate(3px)}.learn-related-soon{color:var(--ink-40);background:var(--ink-07);border-radius:999px;align-self:flex-start;padding:3px 10px;font-size:11.5px;font-weight:600}.learn-cta-card{background:var(--deep);color:var(--on-deep);box-shadow:var(--shadow-float);border-radius:20px;padding:26px 24px}.learn-cta-title{font-family:var(--font-display);margin-bottom:8px;font-size:20px;font-weight:800;line-height:1.2}.learn-cta-text{color:var(--on-deep-60);margin-bottom:18px;font-size:14px;line-height:1.55}.learn-cta-btn{color:#fff;width:100%;height:46px;transition:background var(--dur-micro) var(--ease);background:#e79f02;border-radius:20px;justify-content:center;align-items:center;gap:8px;font-size:15px;font-weight:700;display:inline-flex}.learn-cta-btn:hover{background:var(--gold-hover)}.learn-cta-mobile{margin-top:56px;display:none}@media (max-width:900px){.learn-cta-mobile{display:block}}
