:root{--bg:#f5f4ed;--paper:#fffefa;--ink:#243b33;--muted:#69776f;--line:#dedfd5;--accent:#c65b42;--soft:#f5e4d8;--green:#2e6d52;--greenbg:#e4f0e8;--red:#ae453d;--blue:#6e93a5;--shadow:0 7px 24px #213b3210}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:15px;line-height:1.5}button,input,select{font:inherit}button,select{cursor:pointer}button{color:inherit;border:1px solid var(--line);background:var(--paper);border-radius:10px;padding:10px 15px;transition:background .15s,border-color .15s,transform .15s}button:hover{background:#f0f0e5;border-color:#b5c1b7}button:active{transform:translateY(1px)}button:disabled{opacity:.45;cursor:default}button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,a:focus-visible{outline:3px solid #ca8b4b;outline-offset:3px}.primary{background:var(--ink);color:#fff;border-color:var(--ink)}.primary:hover{background:#36584b;color:#fff}.accent{background:var(--accent);color:white;border-color:var(--accent)}.accent:hover{background:#ac4d37}.quiet{background:transparent;border-color:transparent}.small{font-size:12px;padding:6px 9px}.muted{color:var(--muted)}.eyebrow{text-transform:uppercase;letter-spacing:.15em;font-size:11px;font-weight:750;color:var(--accent)}.sr{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.spread{justify-content:space-between}.pill{display:inline-flex;align-items:center;gap:5px;padding:4px 9px;border-radius:100px;background:#e9ece2;font-size:11px;font-weight:650}.brand{display:flex;align-items:center;gap:11px;border:0;padding:0;background:transparent;text-align:left}.brand:hover{background:transparent}.brand strong{font-size:20px;letter-spacing:-.8px}.brand small{display:block;font-size:10px;text-transform:uppercase;letter-spacing:.17em;color:var(--muted)}.brandmark{height:42px;width:42px;background:var(--ink);color:#f4dcc0;border-radius:13px;display:grid;place-items:center}.brandmark svg{width:28px;height:28px}header{min-height:82px;padding:15px 32px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:18px;background:var(--paper)}header nav{display:flex;align-items:center;gap:8px}header nav button[aria-current="page"]{color:var(--accent);background:var(--soft);border-color:transparent}header .online{color:var(--muted);font-size:11px}.shell{display:grid;grid-template-columns:230px minmax(0,1fr);max-width:1680px;margin:auto}.sidebar{padding:30px 19px 20px 25px;border-right:1px solid var(--line);min-height:calc(100vh - 83px)}.sidebar h2{font-size:11px;text-transform:uppercase;letter-spacing:.13em;color:var(--muted);margin:0 0 14px}.group-btn{width:100%;display:flex;align-items:center;justify-content:space-between;border-color:transparent;background:transparent;padding:10px 11px;text-align:left;font-size:13px;margin-bottom:3px}.group-btn.active{background:var(--ink);color:white}.group-btn.active .count{color:#d1dfd7}.count{font-size:11px;color:var(--muted)}.sidebar .subnote{font-size:11px;line-height:1.7;color:var(--muted);padding:18px 10px}.mini-progress{margin-top:27px;padding:17px 13px;border:1px solid var(--line);border-radius:14px;background:var(--paper)}.mini-progress strong{font-size:25px;font-family:Georgia,serif;font-weight:400}.bar{height:5px;background:#e6e9df;border-radius:9px;overflow:hidden;margin:10px 0}.bar i{display:block;height:100%;background:var(--green)}main{min-width:0;padding:30px 36px 60px}.hero{display:grid;grid-template-columns:minmax(0,1fr) 215px;gap:32px;align-items:center;margin-bottom:27px}.hero h1{font-family:Georgia,"Times New 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button{border:0;background:transparent;font-size:12px;padding:7px 12px}.segmented button.active{background:var(--paper);box-shadow:0 2px 5px #243b3310}.search{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:10px 13px;min-width:220px;width:260px;color:var(--ink)}.catalogtitle{font-size:16px;font-weight:650;margin:12px 0 16px;display:flex;justify-content:space-between}.catalogtitle span{font-size:12px;color:var(--muted);font-weight:400}.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:17px}.card{padding:0;text-align:left;border:1px solid var(--line);background:var(--paper);border-radius:15px;overflow:hidden;display:flex;flex-direction:column;position:relative;box-shadow:0 2px 4px #243b3303}.card:hover{border-color:#aab9ab;box-shadow:var(--shadow);background:var(--paper);transform:translateY(-2px)}.card-art{height:154px;width:100%;background:#eeeee5;position:relative;border-bottom:1px solid #e8e9df;display:flex;align-items:center;justify-content:center;overflow:hidden}.card-art svg{height:180px;width:230px;opacity:.95}.card-art .topic{position:absolute;top:11px;left:12px;font-size:10px;background:#fffefacb;border:1px solid #fff;padding:3px 7px;border-radius:6px}.card-art .arrow{position:absolute;right:13px;bottom:13px;height:27px;width:27px;display:grid;place-items:center;border:1px solid #d0d5ca;background:#fffefa;border-radius:50%}.card-body{padding:16px 17px;flex:1}.card-body .eyebrow{font-size:9px;letter-spacing:.1em}.card h3{font-size:16px;line-height:1.3;margin:7px 0}.card p{font-size:12px;color:var(--muted);margin:6px 0 15px;line-height:1.5}.card-foot{font-size:11px;color:var(--muted);display:flex;justify-content:space-between;gap:8px;align-items:center}.mastered{color:var(--green);font-weight:700}.text-preview{font-family:Georgia,serif;font-size:23px;line-height:1.6;max-width:190px;color:#7d8a7f;transform:rotate(-4deg)}.text-preview i{display:inline-block;width:75px;border-bottom:2px solid var(--accent)}.empty{border:1px dashed #bfc8bd;border-radius:18px;padding:42px;text-align:center;color:var(--muted)}.crumb{display:flex;align-items:center;gap:10px;font-size:11px;color:var(--muted);margin-bottom:16px}.exercise-title h1{font-family:Georgia,serif;font-size:35px;font-weight:400;letter-spacing:-1px;line-height:1.17;margin:5px 0 9px}.exercise-title p{font-size:13px;color:var(--muted);margin:0}.workspace-tools{margin:20px 0 16px;display:flex;align-items:center;justify-content:space-between;gap:8px;flex-wrap:wrap}.workspace-tools select{border:1px solid var(--line);border-radius:9px;background:var(--paper);padding:9px 12px;color:var(--ink);font-size:12px}.workspace-tools label{font-size:12px;display:flex;align-items:center;gap:7px}.workspace{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(290px,.85fr);gap:20px;align-items:start}.illustration{background:var(--paper);border:1px solid 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text{fill:white}.pin.correct .bubble{fill:var(--green);stroke:var(--green)}.pin.correct text{fill:white}.pin.wrong .bubble{stroke:var(--red);stroke-width:3}.bank{padding:14px 17px;border-top:1px solid var(--line);background:#f8f8f0}.bank h3{font-size:11px;margin:0 0 9px;font-weight:650}.bank .chips{display:flex;gap:5px;flex-wrap:wrap}.bank button{font-size:11px;padding:6px 9px;border-radius:7px;border-color:#d5dccf}.bank button.used{opacity:.45}.answers{background:var(--paper);border:1px solid var(--line);border-radius:15px;padding:18px}.answers h2{font-size:15px;margin:0 0 4px}.answers>p{font-size:11px;color:var(--muted);margin:0 0 17px}.answer{margin-bottom:12px}.input-row{display:flex;align-items:center;gap:8px}.number{height:26px;min-width:26px;display:grid;place-items:center;border:1px solid var(--line);border-radius:8px;font-size:11px;color:var(--muted);background:#f5f5ed}.answer input{width:100%;min-width:0;padding:10px 11px;background:#fafaf6;border:1px solid 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.answers>p{font-size:12px}.checkbar{display:flex;gap:8px;margin-top:18px;flex-wrap:wrap}.checkbar .primary{flex:1}.result{margin:15px 0 0;padding:13px;border-radius:10px;background:#eaf0e5;font-size:13px;line-height:1.6}.result strong{font-size:19px;font-weight:650}.result small{display:block;color:var(--muted);font-size:11px}.below-tools{margin-top:15px;display:flex;gap:8px;flex-wrap:wrap;align-items:center}.below-tools button{font-size:11px}.source{font-size:10px;color:var(--muted);margin-top:20px;line-height:1.7}.pager{display:flex;justify-content:space-between;margin-top:20px;gap:10px}.pager button{font-size:12px}.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);z-index:100;padding:12px 22px;border-radius:12px;background:var(--ink);color:white;box-shadow:var(--shadow);max-width:90vw;font-size:13px;pointer-events:none}.toast:empty{display:none}dialog{max-width:680px;width:calc(100% - 28px);max-height:88vh;overflow:auto;border:1px solid var(--line);border-radius:18px;padding:30px;background:var(--paper);color:var(--ink);box-shadow:0 24px 100px #0003}dialog::backdrop{background:#172c285e}dialog h2{font-family:Georgia,serif;font-weight:400;font-size:29px;margin:0 0 12px}dialog h3{font-size:14px;margin:20px 0 7px}dialog p,dialog li{font-size:13px;color:var(--muted);line-height:1.7}dialog a{color:var(--green)}.help-close{float:right}.scoreboard{display:flex;align-items:center;gap:15px;justify-content:space-between;padding:12px 17px;background:#e8eddf;border:1px solid #c9d4c3;border-radius:13px;margin:18px 0}.team{display:flex;align-items:center;gap:8px}.team input{width:110px;max-width:25vw;border:0;background:transparent;font-weight:650;color:var(--ink)}.team b{font-size:26px;font-family:Georgia,serif;font-weight:400;min-width:28px;text-align:center}.team button{padding:3px 9px}.scoreboard small{font-size:10px;color:var(--muted)}.aula .sidebar{display:none}.aula .shell{display:block;max-width:1520px}.aula main{padding:24px 32px}.aula .workspace{grid-template-columns:1.25fr .8fr}.aula .answer input{font-size:18px}.aula .clue{font-size:17px}.aula .pin text{font-size:15px}.aula .workspace-tools{margin-top:12px}.aula .exercise-title h1{font-size:32px}.aula .illustration{top:12px}.review-summary{display:flex;gap:16px;flex-wrap:wrap;margin:20px 0}.review-stat{background:var(--paper);padding:20px 28px;border:1px solid var(--line);border-radius:14px;min-width:160px}.review-stat b{display:block;font-family:Georgia,serif;font-weight:400;font-size:34px}.review-stat span{font-size:12px;color:var(--muted)}.review-list{display:grid;gap:10px}.review-item{display:flex;justify-content:space-between;align-items:center;gap:20px;border:1px solid var(--line);padding:16px 20px;border-radius:13px;background:var(--paper)}.review-item h3{margin:0;font-size:15px}.review-item p{margin:3px 0 0;color:var(--muted);font-size:12px}footer{font-size:11px;color:var(--muted);margin-top:40px;padding-top:18px;border-top:1px solid var(--line)}#printArea{display:none}.mobile-groups{display:none}.hidden{display:none!important}@media(min-width:1450px){.cards{grid-template-columns:repeat(4,minmax(0,1fr))}}@media(max-width:1100px){header{padding:15px 22px}.shell{grid-template-columns:195px minmax(0,1fr)}main{padding:27px 24px 50px}.sidebar{padding:28px 13px}.cards{grid-template-columns:repeat(2,minmax(0,1fr))}.workspace{grid-template-columns:minmax(0,1fr) minmax(265px,.85fr)}.hero{grid-template-columns:1fr 160px;gap:17px}.hero-art{height:180px}.hero-art svg{left:-39px}.hero-art .badge{left:18px;font-size:9px;padding:6px 9px}.hero h1{font-size:39px}.aula .workspace{grid-template-columns:1fr 1fr}}@media(max-width:800px){header{padding:14px 17px;align-items:center;flex-wrap:wrap;gap:12px}.brand strong{font-size:19px}.brandmark{width:36px;height:36px}header nav{gap:3px}header nav button{padding:7px 9px;font-size:12px}header .online{display:none}.shell{display:block}.sidebar{display:none}main{padding:22px 18px 45px}.mobile-groups{display:block;margin:0 0 15px;width:100%;padding:10px;border-radius:9px;border:1px solid var(--line);background:var(--paper);color:var(--ink)}.hero{grid-template-columns:1fr 145px}.hero-art{height:170px}.hero h1{font-size:37px}.hero p{font-size:13px}.statrow{gap:15px}.workspace{grid-template-columns:1fr}.illustration{position:relative;top:0}.figure-canvas{max-height:none}.figure-canvas svg{max-height:550px}.answers{padding:20px}.workspace-tools{gap:10px}.aula .workspace{grid-template-columns:1fr}.aula main{padding:20px 16px}.exercise-title h1{font-size:32px}.scoreboard{flex-wrap:wrap;justify-content:center}.source{font-size:11px}.card-art{height:145px}.card-body{padding:14px}.search{width:100%}.filterbar{align-items:stretch}.filterbar>div{width:100%}.segmented{width:max-content!important}}@media(max-width:480px){.hero{grid-template-columns:1fr}.hero-art{display:none}.hero h1{font-size:40px}.statrow{justify-content:space-between;gap:8px}.statrow b{font-size:15px}.cards{gap:11px}.card h3{font-size:14px}.card p{font-size:11px}.card-art{height:125px}.card-art svg{width:180px;height:151px}.card-foot{font-size:10px}.card-body{padding:12px}.card-art .topic{font-size:9px;left:8px;top:8px}.brand small{font-size:8px}.brand strong{font-size:18px}.brandmark{width:32px;height:32px}header{gap:10px}header nav{width:100%;justify-content:space-between}.text-preview{font-size:18px;max-width:130px}.workspace-tools .row{width:100%}.workspace-tools select{flex:1}.review-item{padding:13px;gap:10px}.review-item h3{font-size:13px}.review-stat{min-width:0;flex:1;padding:15px}.team input{width:94px}.hero .row button{font-size:13px}.catalogtitle{font-size:14px}.catalogtitle span{font-size:11px}.pager button{padding:9px}.checkbar button{font-size:13px}.hint-btn{padding:6px 10px}.input-row input{font-size:16px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}@media print{@page{size:A4;margin:13mm}body{background:white;color:black;font-size:11pt}header,.shell,#toast,dialog{display:none!important}#printArea{display:block}#printArea h1{font:23pt Georgia;margin:0 0 5mm}#printArea h2{font-size:15pt;margin:0 0 4mm}#printArea p{font-size:9pt}#printArea svg{width:115mm;height:100mm;display:block;margin:auto}#printArea ol{columns:2;column-gap:12mm;padding-left:6mm}#printArea li{break-inside:avoid;margin-bottom:6mm;font-size:10pt;line-height:1.5}#printArea .print-line{border-bottom:1px solid #999;display:block;height:7mm}#printArea .print-source{margin-top:7mm;font-size:8pt;border-top:1px solid #ddd;padding-top:3mm}}

/* Chapa Lab · edición atlas */
.chapalab-link{color:var(--ink);font-weight:800;font-size:11px;letter-spacing:.15em;text-decoration:none;padding:10px 14px;border:1px solid var(--line);border-radius:8px;white-space:nowrap}.chapalab-link span{color:var(--accent);margin-left:8px}
.hero{grid-template-columns:minmax(0,1fr) 270px}.hero-art{height:255px;border-radius:90px 90px 35px 35px;background:radial-gradient(ellipse at 50% 45%,#fffaf1 30%,#e8ddcd 100%);box-shadow:inset 0 0 0 1px #d9d1c0}.hero-art svg{height:285px;width:315px;left:-22px;top:-18px}.hero-art .badge{left:58px;bottom:11px;background:#fffdf5e8}
.card-art{height:192px;background:radial-gradient(ellipse at 50% 52%,#fffdf8 28%,#f0e8db 100%)}.card-art svg{height:208px;width:270px;opacity:1}.card-art .topic{max-width:75%;background:#fffaf1d9;letter-spacing:.04em}.figure-canvas{background:#fffdf8}.figure-note{background:#f8f4ec}.illustration{border-color:#d8cfc1}.pin .wire{stroke:#8c8275;stroke-width:1.1}.pin .bubble{stroke:#796f60;fill:#fffdf7}.pin .dot{fill:#705b48;stroke:#fffdf8}.pin.active .wire{stroke:#b64e36;stroke-width:2}.pin.active .bubble{fill:#b64e36;stroke:#b64e36}.pin.correct .bubble{fill:var(--green);stroke:var(--green)}
footer a{color:var(--ink);text-decoration:none}footer a:hover{text-decoration:underline}.footer-links{float:right}.brand small{font-size:9px;letter-spacing:.12em}.zoom-head{display:flex;justify-content:space-between;gap:15px;align-items:start}.zoom-head h2{font-size:27px;margin:7px 0 0}.zoom-head button{padding:6px 12px}.zoom-controls{display:flex;align-items:center;gap:15px;flex-wrap:wrap;padding:12px 0;font-size:12px}.zoom-controls select{border:1px solid var(--line);border-radius:7px;background:var(--paper);padding:5px}.zoom-controls span{color:var(--muted);font-size:11px}.zoom-scroll{overflow:auto;max-height:68vh;border:1px solid #ddd4c6;border-radius:12px;background:#fffdf8}#atlasZoom{width:min(1100px,96vw);max-width:1100px;padding:20px;max-height:96vh}#zoomDrawing{width:100%;min-width:100%}#zoomDrawing svg{display:block;width:100%}.zoom-caption{font-size:11px!important;margin:10px 0 0}.zoom-legend{display:grid;grid-template-columns:repeat(3,1fr);gap:6px;font-size:12px;padding-top:15px}.zoom-legend b{display:inline-grid;place-items:center;height:23px;width:23px;background:#e9e6dc;border-radius:7px;margin-right:5px}
@media(max-width:1100px){.hero{grid-template-columns:1fr 210px}.hero-art{height:235px}.hero-art svg{left:-51px}.hero-art .badge{left:34px}.card-art{height:180px}}
@media(max-width:800px){.hero{grid-template-columns:1fr 150px}.hero-art{height:195px}.hero-art svg{height:230px;width:250px;left:-50px}.hero-art .badge{left:13px}.chapalab-link{font-size:9px;padding:7px}.footer-links{float:none;display:block;margin-top:10px}.zoom-legend{grid-template-columns:repeat(2,1fr)}}
@media(max-width:480px){.hero{grid-template-columns:1fr}.hero-art{display:none}.hero h1{font-size:38px}.card-art{height:155px}.card-art svg{height:175px;width:218px}.chapalab-link{position:absolute;right:15px;top:22px;font-size:8px;padding:5px}.brand{padding-right:77px}.brand strong{font-size:17px}.brand small{font-size:8px}.zoom-head h2{font-size:22px}#atlasZoom{padding:14px}.zoom-controls span{display:none}}
@media print{#atlasZoom{display:none!important}}

.language-control{display:flex;align-items:center;gap:6px;font-size:11px;color:var(--muted)}
.language-control select{background:white;border:1px solid var(--line);border-radius:8px;padding:7px;color:var(--ink);max-width:125px}
.figure-heading{display:flex;align-items:center;justify-content:space-between;padding:12px 18px;border-bottom:1px solid var(--line);font-size:12px}
.figure-canvas,.card-art{background:white}.card-art{height:215px}.card-art svg{width:100%;height:215px}.card-art .topic{z-index:1}
.hero-art{background:white;box-shadow:inset 0 0 0 1px #e6ded1;border-radius:110px 110px 28px 28px;height:270px}
.hero-art svg{inset:0;width:100%;height:270px;position:relative}.hero-art .badge{bottom:6px;left:50%;transform:translateX(-50%);white-space:nowrap}
.image-credit{font-size:10px;line-height:1.6;margin-top:9px;color:#627368}.image-credit a{color:inherit}
.bank .word{font-size:12px;padding:6px 10px;border-radius:20px;background:#fff;border:1px solid var(--line);margin:3px}.bank .word.used{opacity:.5}
.hidden{display:none}.help-close{float:right}#help a{color:var(--green)}#help details li{font-size:12px;line-height:1.8}.language-tools{margin:14px 0}
.figure-note{background:#faf8f3}.pin .wire{stroke:#74867b;stroke-width:1.15}.pin .dot{fill:#214d3e;stroke:#fff;stroke-width:1.2}
.footer-credit{display:block;margin-top:10px;color:var(--muted);font-size:10px}
@media(max-width:1050px){header{flex-wrap:wrap}.language-control{margin-left:auto}.chapalab-link{position:static}.hero-art{height:235px}.hero-art svg{height:235px}}
@media(max-width:650px){.language-control{margin-left:0}header nav{order:3;width:100%}.brand{padding-right:0}.card-art,.card-art svg{height:190px}.workspace-tools button{font-size:11px}.hero-art{display:none}}
@media print{.pin .wire{stroke:#444}.pin .dot{fill:#222}.image-credit{font-size:7pt}a{color:inherit}.print-source a{text-decoration:none}}

.release-footer{max-width:1200px;margin:30px auto;padding:24px;color:var(--muted);font-size:12px;border-top:1px solid var(--line)}.release-footer nav{display:flex;flex-wrap:wrap;gap:18px}.release-footer a{color:var(--green)}.release-footer p{max-width:850px;line-height:1.7}.skip-link{position:absolute;left:12px;top:-100px;background:white;color:#244a3c;padding:12px;z-index:9999}.skip-link:focus{top:8px}@media print{.release-footer,.skip-link{display:none}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;animation:none!important;transition:none!important}}