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var(--line);min-height:78px;gap:12px}.brand{display:inline-flex;align-items:center;gap:0;text-decoration:none;font-size:23px;font-weight:850;color:var(--ink);letter-spacing:-1px}.brand>span:last-child{color:#d72b4b}.brand-mark{display:grid;place-items:center;width:32px;height:32px;margin-right:8px;border-radius:11px;color:white;background:#e63754;font-size:15px}.header-actions{display:flex;align-items:center;gap:10px}.xp{font-size:14px;font-weight:800;padding:6px 10px;border-radius:20px;color:#735200;background:#fff6d9;white-space:nowrap}.icon-button{background:var(--soft);border:1px solid var(--line);border-radius:16px;min-width:48px;height:48px;font-size:24px}.app-shell{max-width:960px;margin:auto;padding:38px 24px 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var(--line);border-radius:var(--radius);padding:23px;display:flex;flex-direction:column;background:var(--surface);box-shadow:0 4px 0 #edf0f6;position:relative;transition:transform .15s}.topic-card:hover{transform:translateY(-2px)}.topic-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.topic-num{width:40px;height:40px;display:grid;place-items:center;border-radius:14px;background:var(--lavender);color:var(--primary);font-size:16px;font-weight:850}.topic-tag{font-size:12px;font-weight:800;color:var(--teal);background:var(--teal-bg);padding:5px 9px;border-radius:30px}.topic-card h3{font-size:23px;margin-bottom:10px}.topic-card p{font-size:16px;color:var(--muted);margin-bottom:18px}.topic-meta{font-size:12px;color:var(--muted);display:flex;gap:10px;flex-wrap:wrap;margin-top:auto;margin-bottom:16px}.topic-card 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15px}.result>p{font-size:19px;color:var(--muted);margin-bottom:22px}.result-stats{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:24px 0}.result-stat{padding:20px;border:1px solid var(--line);border-radius:20px;background:var(--soft)}.result-stat strong{display:block;font-size:30px;color:var(--primary)}.result-stat span{font-size:14px;color:var(--muted)}.result .primary,.result .secondary{width:100%;margin:7px 0}.share-box{text-align:left;padding:22px;border:1px solid var(--line);border-radius:22px;margin:24px 0}.share-box h3{font-size:21px;margin-bottom:10px}.share-box p{font-size:16px;color:var(--muted)}.share-buttons{display:flex;gap:10px;margin-top:14px;flex-wrap:wrap}.share-buttons button{flex:1;white-space:nowrap;font-size:15px;min-height:52px;padding:12px}.share-buttons .whatsapp{color:#087543;border-color:#9cd4b5;background:#f1fff6}.link-fallback{word-break:break-all;font-size:14px;background:var(--soft);padding:12px;border-radius:12px;display:block;margin-top:12px;user-select:all}.notice{position:fixed;bottom:calc(120px + env(safe-area-inset-bottom));left:50%;transform:translateX(-50%);padding:13px 20px;border-radius:16px;max-width:calc(100vw - 32px);width:max-content;z-index:50;background:#17223b;color:white;font-size:15px;box-shadow:0 6px 24px #17223b33}.loading{text-align:center;padding:70px 0;color:var(--muted);font-size:18px}.loading-dot{width:15px;height:15px;border-radius:50%;display:inline-block;background:#6956dc;margin-right:8px;animation:pulse 1s infinite alternate}.error-card{border:1px solid #f0d2a5;background:#fff7ec;border-radius:24px;padding:25px}.error-card p{font-size:18px;margin:12px 0 22px}.storage-warning{font-size:14px;color:#8c5c15;background:#fff7e8;padding:12px 16px;border-radius:12px;margin-bottom:18px}.empty-state{padding:24px;border:1px solid var(--line);border-radius:20px;color:var(--muted)}.completion-note{font-size:14px;color:var(--teal);margin:12px 0}.new-content{background:var(--teal-bg);color:var(--teal);font-size:14px;padding:12px 16px;border-radius:14px;margin-bottom:20px}.in-lesson .bottom-ad{margin-top:36px}.inline-error{font-size:15px;color:var(--red);margin-top:12px}.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@keyframes pulse{to{opacity:.3}}
@media(max-width:600px){.app-header{padding:12px 18px;min-height:72px}.brand{font-size:21px}.brand-mark{width:29px;height:29px;font-size:13px}.header-actions{gap:7px}.xp{font-size:12px;padding:6px 8px}.icon-button{min-width:44px;height:44px}.app-shell{padding:30px 20px 24px}.hero{display:block;position:relative}.hero-art{display:none}.hero h1{font-size:37px;max-width:340px;line-height:1.13}.hero p{font-size:18px;max-width:340px}.hero .eyebrow{font-size:11px}.pill{font-size:12px}.stats{margin:24px 0 27px;padding:17px 4px}.stat strong{font-size:23px}.stat span{font-size:12px}.section-head{align-items:flex-start}.section-head small{max-width:105px;text-align:right;line-height:1.4}.section-head h2{font-size:25px}.course-tab{font-size:14px;padding:13px 10px;gap:7px;min-height:64px}.course-tab>span:first-child{font-size:22px}.topic-grid{grid-template-columns:1fr;gap:18px}.topic-card{padding:22px}.topic-card h3{font-size:25px}.topic-card p{font-size:17px}.topic-meta{font-size:13px}.topic-card .primary{font-size:17px;min-height:56px}.lesson-top{padding:13px 0 14px;margin-bottom:22px}.lesson-topic{font-size:12px}.progress-head{font-size:11px}.step-heading{font-size:28px}.step-body p,.passage p{font-size:19px;line-height:1.7}.passage{padding:19px 17px}.choice{font-size:19px;padding:16px 14px;gap:11px}.choice-letter{flex-basis:29px;height:29px}.explorer{padding:16px}.explorer svg{max-height:230px}.feedback{padding:20px 17px}.lesson-action{padding-inline:20px}.action-inner{gap:10px}.action-inner .primary{font-size:17px;padding-inline:14px}.result h1{font-size:32px}.share-box{padding:20px}.result-art{width:125px}.site-foot{padding-inline:20px}.demo{padding:18px}.topic-top{margin-bottom:14px}}
@media(max-width:350px){.app-shell{padding-inline:16px}.app-header{padding-inline:16px}.hero h1{font-size:33px}.course-tab{font-size:13px;padding:12px 8px}.course-tab>span:first-child{font-size:20px}.step-heading{font-size:26px}.choice{font-size:18px}.share-buttons{display:grid;grid-template-columns:1fr}.control-row button{font-size:13px;padding-inline:8px}.progress-head{font-size:10px}.xp{font-size:11px}.lesson-action{padding-inline:16px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
/* Keep controls usable on compact WebViews and make disclosure targets explicit. */
.icon-button,.hint summary,.option-review summary{min-height:48px;min-width:48px}.hint summary,.option-review summary{display:list-item;padding-block:9px}.icon-button{height:48px}
.brand{min-height:48px}.lesson-nav>.icon-button{font-size:23px}.topic-card .primary{white-space:normal}#view-heading:focus{outline:none}
.formula-label{font-size:18px;font-weight:800;text-align:center;overflow-wrap:anywhere}.data-table{margin-top:16px;font-size:16px}.data-table summary{cursor:pointer;min-height:48px;padding:10px 0}.data-table table{border-collapse:collapse;width:100%;margin-top:12px;text-align:left}.data-table th,.data-table td{padding:10px 8px;border-bottom:1px solid var(--line);overflow-wrap:anywhere}.data-table caption{text-align:left;font-size:14px;color:var(--muted);padding:6px 0}
.catalog-search{margin:0 0 22px}.catalog-search label{display:block;font-size:15px;font-weight:750;margin-bottom:9px}.catalog-search input{display:block;width:100%;min-width:0;min-height:56px;border:1px solid #d8dfec;border-radius:16px;padding:13px 16px;background:#f8f9fd;color:var(--ink);font-size:18px}.search-count{font-size:13px;color:var(--muted);margin-top:7px}

/* Psychology: clear mobile typography and touch controls. */
.learning-page{--primary:#173e79;--primary-dark:#0b2856;--lavender:#edf3fe;--soft:#f7f9fc}
.course-tabs{grid-template-columns:1fr}.course-tab{font-size:18px!important;min-height:56px}.hero .eyebrow{font-size:13px;letter-spacing:.1em}.hero p{font-size:19px;line-height:1.65}.hero h1{max-width:580px}.app-shell{min-width:0}.hero,.topic-card,.step,.choices,.choice,.result,.explorer{min-width:0}.choice>span:last-child{min-width:0;overflow-wrap:anywhere}.guide-link{display:flex;align-items:center;justify-content:center;text-align:center;min-height:48px;margin-top:12px;color:var(--primary);font-weight:750;font-size:16px}.topic-card .primary{white-space:normal}.stats .stat span{font-size:14px}.course-description,.catalog-note{font-size:17px}.site-foot{font-size:14px;line-height:1.7}.site-foot a{font-size:16px}.concept-rail{display:grid;gap:14px;margin-top:18px}.concept-node{position:relative;display:block;width:100%;border:2px solid #ded9f1;border-bottom-width:5px;border-radius:18px;background:#fff;padding:17px;text-align:left;color:#25304b;min-height:64px;font:inherit;line-height:1.6}.concept-node:not(:last-child):after{position:absolute;content:'';height:14px;width:3px;left:34px;bottom:-18px;background:#c5bcea}.concept-heading{display:flex;align-items:center;gap:12px;font-size:18px;font-weight:800}.concept-number{display:grid;place-items:center;width:32px;height:32px;flex:0 0 32px;border-radius:11px;background:#eeebfc;color:#6550d7;font-size:15px}.concept-toggle{margin-left:auto;font-size:24px;color:#8b7fd1}.concept-node[aria-expanded=true]{background:#f4f0ff;border-color:#9d8de3}.concept-node .node-text{padding:13px 0 0;font-size:18px}.concept-node:nth-child(3n+2) .concept-number{background:#e2f8f0;color:#087f71}.concept-node:nth-child(3n) .concept-number{background:#fff2d4;color:#956515}.explorer .fragment-list{display:flex;flex-wrap:wrap;gap:9px;line-height:1.5;margin:18px 0}.explorer .fragment{margin:0;max-width:100%;font-size:18px;overflow-wrap:anywhere}.explorer output{line-height:1.6;overflow-wrap:anywhere}.guide-page{font-family:Nunito,system-ui,sans-serif;color:var(--ink);background:#fff}.guide-page .app-shell{max-width:800px}.guide-page h1{font-size:clamp(31px,6vw,46px);line-height:1.17;letter-spacing:-.03em;margin:20px 0}.guide-page h2{font-size:27px;margin:36px 0 18px}.guide-page h3{font-size:21px;margin:16px 0}.guide-page p,.guide-page li{font-size:19px;line-height:1.75;overflow-wrap:anywhere}.guide-page p{margin:16px 0}.guide-page ol,.guide-page ul{padding-left:26px}.guide-page .guide-block{padding:22px;border:1px solid var(--line);border-radius:22px;background:var(--soft);margin:22px 0}.guide-page details{padding:16px 0;border-top:1px solid var(--line)}.guide-page summary{min-height:48px;cursor:pointer;font-size:18px;font-weight:800}.guide-page .primary{width:100%;margin:20px 0}.guide-page .breadcrumbs{font-size:15px;line-height:1.8;color:var(--muted)}.guide-page .sources a{overflow-wrap:anywhere}.guide-page .sources{font-size:16px}.guide-page .sources li{font-size:16px}.guide-page .guide-nav{display:flex;flex-wrap:wrap;gap:12px}.guide-page .guide-nav a{min-height:48px;padding-block:12px}.guide-page .manual-ad-ready{margin-block:32px}.catalog-static{margin:20px auto;padding:24px;max-width:940px;border-top:1px solid var(--line)}.catalog-static h2{font-size:23px}.catalog-static p,.catalog-static li{font-size:17px;line-height:1.7}.catalog-static a{display:inline-block;min-height:48px;padding:10px 0}
@media(max-width:600px){.hero h1{font-size:35px}.hero p{font-size:18px}.hero .eyebrow{font-size:12px}.course-description{font-size:17px}.stats .stat span{font-size:13px}.guide-page .app-shell{padding-top:20px}.guide-page .guide-block{padding:19px 16px}.concept-node{padding:15px 13px}.concept-heading{gap:10px}.step-body p,.passage p,.feedback p,.feedback li{font-size:19px}.control-row button,.explorer label,.explainer{font-size:16px}.share-buttons button{font-size:16px}.progress-wrap{min-width:0}.lesson-action .primary{font-size:17px}.site-foot a{font-size:16px}.catalog-static{padding:20px}}
@media(max-width:350px){.hero h1{font-size:32px}.concept-heading{font-size:17px}.concept-number{flex-basis:28px;width:28px;height:28px}.lesson-action .primary{font-size:16px}.step-heading{font-size:27px}.app-header{gap:8px}.header-actions{gap:5px}}

.hero-start{margin-top:22px;min-width:240px}.course-tabs:has(.course-tab:only-child){display:none}.learning-page .hero+.stats{margin-top:30px}.guide-page .brand{flex-shrink:0}@media(max-width:600px){.hero-start{width:100%;min-width:0;min-height:58px;font-size:18px}.course-description{margin-top:8px}}

/* The learning route uses the same typography with a blue and gold identity. */
.unam-hero{margin-bottom:24px}.unam-emblem{border:2px solid #e8cc7d;border-radius:35px;background:linear-gradient(140deg,#fff9e7,#f4e4b9);padding:28px 25px;transform:rotate(4deg);text-align:center;color:#173e79;box-shadow:0 12px 0 #f2e8cc}.unam-emblem span{display:block;font-size:15px;font-weight:700}.unam-emblem strong{display:block;font-size:40px;line-height:1.05;letter-spacing:-2px;margin:12px 0}.mode-links{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:24px 0}.mode-card{display:flex;align-items:center;gap:12px;border:1px solid #dbe5f2;border-radius:20px;padding:18px;text-decoration:none;color:#17324e;background:#f5f8fe}.mode-card>span{display:grid;place-items:center;flex:0 0 42px;height:42px;border-radius:13px;background:#f8e8b8;font-size:24px}.mode-card div{flex:1}.mode-card strong,.mode-card small{display:block}.mode-card small{font-size:13px;color:var(--muted);margin-top:4px}.mode-card b{font-size:20px}.route-panel{padding:24px;border:1px solid #dbe5f2;border-radius:24px;background:#f8fafc;margin:28px 0}.route-panel h2{font-size:25px}.route-panel>p{color:var(--muted);font-size:16px;margin:12px 0 0}.route-filters{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:20px}.route-filters label{display:grid;gap:8px;font-size:15px;font-weight:750;min-width:0}.route-filters select{font:inherit;min-height:54px;width:100%;max-width:100%;border:1px solid #bacbe2;border-radius:13px;color:#17324e;background:white;padding:12px 30px 12px 13px}.route-filters select:focus-visible{outline:3px solid #dda73b;outline-offset:3px}.subject-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:22px 0 36px}.subject-card{display:flex;align-items:center;gap:11px;text-align:left;border:2px solid #e1e7f0;border-bottom-width:5px;background:#fff;border-radius:18px;padding:15px 12px;min-height:84px;width:100%;font-size:16px}.subject-card.selected{background:#edf3fe;border-color:#8aa5cb}.subject-card>span:last-child{min-width:0}.subject-card strong{display:block;font-size:16px;line-height:1.3;overflow-wrap:anywhere}.subject-card small{display:block;color:var(--muted);font-size:12px;margin-top:5px}.subject-icon{display:grid;place-items:center;width:38px;flex:0 0 38px;height:42px;border-radius:12px;background:#fff4d3;color:#7c5a11;font-size:22px;font-weight:800}.subject-guide{display:inline-flex;align-items:center;min-height:50px;margin-top:20px;font-weight:750}.topics-section{scroll-margin-top:24px}.catalog-search input{border-color:#c2d0e2}.medals-panel{padding:24px;border:1px solid #e9d6a1;border-radius:24px;margin-top:32px;background:#fffcf3}.medals-panel h2{font-size:25px;margin:12px 0}.medals-panel p{font-size:17px;color:var(--muted)}.medal-list{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}.medal{display:inline-flex;align-items:center;min-height:44px;padding:9px 13px;border:1px solid #e2c57f;border-radius:30px;color:#775312;background:#fff0c2;font-size:14px;font-weight:800}.medal.locked{background:#fff;border-color:#ddd5bf;color:#716950}.combo-badge{display:inline-flex;align-items:center;font-size:12px;padding:5px 10px;background:#fff4cd;border:1px solid #edd18a;border-radius:30px;color:#755313;margin-left:auto;white-space:nowrap}.level-label{flex-wrap:wrap}.result-medal{color:#866019!important;background:#fff7dc;padding:14px;border-radius:15px;font-weight:800}.keyword{font:inherit;font-weight:800;padding:.05em .16em;border-radius:.3em;box-decoration-break:clone;-webkit-box-decoration-break:clone;text-decoration:underline;text-underline-offset:.17em;text-decoration-thickness:1px}.keyword--concept{background:#e7f0ff;color:#153e76}.keyword--formula{background:#e3f5ef;color:#066953}.keyword--contrast{background:#f2e9fb;color:#6b2f83}.keyword--date{background:#fff0bd;color:#77520a}.katex-display{overflow-x:auto;overflow-y:hidden;padding-block:8px}.choice .katex{font-size:1.05em}.step-body .katex{font-size:1.1em}.manual-ad-ready{margin-block:30px}.in-lesson .site-foot{margin-bottom:16px}@media(max-width:760px){.subject-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.unam-emblem{display:none}.mode-links{gap:10px}.mode-card{padding:14px;gap:8px}.mode-card>span{flex-basis:32px;width:32px;height:36px;font-size:20px}.mode-card strong{font-size:15px}.mode-card small{font-size:12px}.mode-card b{display:none}.route-panel{padding:20px}.route-filters{grid-template-columns:1fr}.subject-card{padding:14px 10px}.subject-card strong{font-size:15px}.subject-icon{width:30px;flex-basis:30px;height:36px;font-size:20px}.stats .stat strong{font-size:24px}.combo-badge{font-size:11px}.step-heading{font-size:29px}.medals-panel{padding:20px}}@media(max-width:350px){.mode-links{grid-template-columns:1fr}.subject-grid{gap:9px}.subject-card{gap:7px}.subject-card strong{font-size:14px}.subject-card small{font-size:11px}.subject-icon{width:24px;flex-basis:24px;font-size:18px}.hero h1{font-size:32px}}
.step-body .katex,.feedback .katex,.choice .katex{max-width:100%;overflow-x:auto;overflow-y:hidden;display:inline-block;vertical-align:middle}.concept-number{background:#edf3fe;color:#173e79}.concept-toggle{color:#5475a3}.concept-node[aria-expanded=true]{background:#f0f5ff;border-color:#8fa9ce}
.step-heading .katex,.question-prompt .katex,.hint .katex,.solution-box .katex{display:inline-block;max-width:100%;overflow-x:auto;overflow-y:hidden;vertical-align:middle}
.guide-page .katex{display:inline-block;max-width:100%;overflow-x:auto;overflow-y:hidden;vertical-align:middle}.guide-page .katex-display{display:block;overflow-x:auto;overflow-y:hidden;max-width:100%;padding-block:10px}.guide-page article,.guide-page section,.guide-page figure{min-width:0}.guide-diagram-data{margin:22px 0;padding:20px;border:1px solid #d4dfed;border-radius:18px;background:#f5f8fd;max-width:100%;min-width:0}.guide-diagram-data figcaption{font-size:18px;font-weight:800;margin-bottom:14px;color:#173e79}.guide-diagram-data table{display:block;max-width:100%;overflow-x:auto;border-collapse:collapse;font-size:16px;line-height:1.5}.guide-diagram-data th,.guide-diagram-data td{padding:12px 10px;border:1px solid #ccd8e8;text-align:left;overflow-wrap:anywhere}.guide-diagram-data th{background:#e7eef8}.guide-diagram-data dl{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,2fr);gap:12px 16px;font-size:17px;line-height:1.6}.guide-diagram-data dt{font-weight:800}.guide-diagram-data dd{margin:0;overflow-wrap:anywhere;min-width:0}.static-course-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:22px 0}.static-course-grid>a,.static-course-grid>li,.static-course-grid>article,.static-course-grid>div{padding:20px;border:1px solid #d7e2f0;border-radius:18px;background:#f6f9ff;min-width:0;overflow-wrap:anywhere}.static-course-grid h3{font-size:22px;margin:0 0 12px}.static-course-grid p{font-size:17px;margin:8px 0}.static-course-grid a{min-height:48px;display:inline-flex;align-items:center;font-weight:750}.curriculum-outline{margin:30px 0}.curriculum-outline details{border:1px solid #d7e2f0;border-radius:18px;margin:14px 0;padding:17px 20px;background:#f9fbff}.curriculum-outline summary{font-size:18px;font-weight:800;min-height:48px;cursor:pointer;line-height:1.6;overflow-wrap:anywhere}.curriculum-outline li{margin:12px 0;font-size:17px;line-height:1.7}.curriculum-outline p{font-size:17px}@media(max-width:600px){.static-course-grid{grid-template-columns:1fr}.guide-diagram-data{padding:17px 14px}.guide-diagram-data dl{grid-template-columns:1fr;gap:7px}.guide-diagram-data dd{margin-bottom:12px}.curriculum-outline details{padding:15px 16px}}

.area-badge{display:table;margin:.5rem 0 .85rem;padding:.4rem .65rem;border:1px solid #bdd2ed;border-radius:.65rem;background:#edf5ff;color:#173f71;font-size:.9rem;font-weight:750;line-height:1.5}.topic-card .area-badge{margin:.25rem 0 .65rem}

.guide-page .scope-badge,.catalog-static .scope-badge{display:inline-block;margin:.3rem .3rem .65rem 0;padding:.4rem .65rem;border:1px solid #bdd2ed;border-radius:.65rem;background:#edf5ff;color:#173f71;font-size:.9rem;font-weight:750;line-height:1.5}

button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline-color:#bd8a18}

@media(max-width:400px){.guide-page .app-header{flex-wrap:wrap;padding:14px 20px;gap:6px}.guide-page .app-header .text-button{padding:8px 0;font-size:14px}}