/* Chispa · La célula
   Tokens alineados con home.css y skull-lab. Los colores de región (--membrane,
   --cytoplasm, --nucleus) son los mismos que usa el visor 3D; no cambiarlos aquí sin
   cambiar viewer.js/curriculum.js. Solo CSS: el estado lo ponen classroom.js
   (.is-question, .is-pick, aria-pressed, aria-current, [hidden]) y el contenido
   de cada paso, que se reconoce con :has(). */
:root{
 --ink:#1f221e;--paper:#fdf9ef;--cream:#f4eedf;--card:#fffdf7;
 --muted:#575b52;--line:#dfddcf;--line-strong:#c3c6b6;
 --pink:#ff3d8b;--pink-light:#ffe6ef;--lime:#b5e04a;--lime-light:#ecf5d4;
 --green:#2f5d4b;--warm:#9a5a3a;--warm-light:#fff0e4;--blue:#3d6fe0;
 --membrane:#e35b86;--cytoplasm:#27988e;--nucleus:#8862c8;
 --display:'Bricolage Grotesque',system-ui,sans-serif;--mono:'Space Mono',ui-monospace,monospace;
 --radius:14px;--shadow:0 1px 0 #ffffff inset,0 10px 30px -18px #3b33204d;
 --footer-h:76px;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{background:var(--cream);scroll-padding-top:16px;scroll-padding-bottom:calc(var(--footer-h) + 16px)}
body{margin:0;background:var(--paper);color:var(--ink);font:500 16px/1.65 var(--display);-webkit-font-smoothing:antialiased;min-height:100dvh}
a{color:inherit;text-underline-offset:4px;text-decoration-thickness:1.5px}
button,input{font:inherit}
button{cursor:pointer;min-height:44px;color:inherit;touch-action:manipulation}
button:disabled{cursor:default}
button,a,input,summary{-webkit-tap-highlight-color:transparent}
:is(button,a,input,summary):focus-visible{outline:3px solid var(--blue);outline-offset:3px;border-radius:6px}
canvas:focus-visible{outline:3px solid var(--blue);outline-offset:-5px}
h1,h2,h3,p{margin-top:0}
h1,h2,h3{line-height:1.08;letter-spacing:-.045em;text-wrap:balance}
p{margin-bottom:18px;text-wrap:pretty}
.sr-only{position:absolute!important;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
.skip-link{position:absolute;left:12px;top:-60px;z-index:20;background:var(--ink);color:var(--paper);padding:10px 14px;border-radius:8px;font-size:14px;text-decoration:none}
.skip-link:focus{top:12px}

/* ---------- Cabecera, igual que la biblioteca ---------- */
.masthead{max-width:1440px;margin:auto;padding:18px 38px;display:flex;align-items:center;gap:24px;border-bottom:1px solid #191a1728}
.brand{font-size:36px;letter-spacing:-2px;font-weight:800;text-decoration:none;line-height:1;display:inline-flex;align-items:baseline}
.brand span{color:var(--pink);margin-left:4px}
.book-label,.eyebrow{font:11px/1.6 var(--mono);letter-spacing:.07em}
.book-label{color:var(--muted)}
.masthead nav{margin-left:auto;display:flex;gap:8px}
.masthead nav a{display:inline-flex;align-items:center;min-height:44px;padding:0 12px;border-radius:999px;font-size:14px;font-weight:600;text-decoration:none}
.masthead nav a:hover{background:#191a170d}
.masthead nav a#index-link{border:1px solid var(--line-strong)}

/* ---------- Encabezado de página y avance ---------- */
main{max-width:1440px;padding:0 38px 28px;margin:auto}
.page-heading{display:flex;justify-content:space-between;align-items:end;gap:30px;padding:26px 0 24px}
.eyebrow{color:var(--green);margin-bottom:8px}
h1{font-size:clamp(34px,4.4vw,58px);margin-bottom:0;letter-spacing:-.055em}
#progress-wrap{width:240px;flex-shrink:0}
#progress-label{font:11px/1.6 var(--mono);margin-bottom:8px;color:var(--muted);text-align:right}
#progress{height:8px;background:#e6e4d6;border-radius:99px;overflow:hidden;box-shadow:inset 0 1px 2px #0000000f}
#progress span{display:block;height:100%;min-width:8px;background:linear-gradient(90deg,var(--lime),#8cc63f);border-radius:inherit;transition:width .35s ease}

/* ---------- Mesa de trabajo ---------- */
.workspace{display:grid;grid-template-columns:minmax(320px,.8fr) minmax(0,1.2fr);gap:clamp(26px,4vw,60px);align-items:start}
.study-panel{padding:12px 0 0;min-width:0;max-width:62ch}
.study-panel:focus{outline:none}
.study-panel h2{font-size:clamp(30px,2.9vw,42px);margin-bottom:20px;max-width:17ch}
.study-panel>p{font-size:17px;line-height:1.7}
.study-panel>p.kicker,.kicker{display:inline-flex;align-items:center;gap:8px;font:700 11px/1.4 var(--mono);letter-spacing:.07em;color:var(--warm);background:var(--warm-light);border-radius:999px;padding:6px 12px;margin-bottom:16px}
.study-panel>p.quiet,.quiet{font-size:14px;line-height:1.6;color:var(--muted)}
.intro-copy{color:var(--muted)}

/* Cada tipo de paso tiene su acento */
.study-panel:has(.options)>.kicker{color:#9b2e5c;background:var(--pink-light)}
.study-panel:has(.options .correct,.options .incorrect)>.kicker{color:var(--green);background:var(--lime-light)}
.study-panel:has(.summary-count)>.kicker,.study-panel:has(.objectives)>.kicker{color:var(--green);background:var(--lime-light)}

.objectives{list-style:none;padding:0;margin:22px 0;display:grid;gap:10px}
.objectives li{padding:14px 16px;border:1px solid var(--line);border-radius:12px;background:var(--card);display:flex;gap:14px;align-items:baseline;font-size:16px;line-height:1.5}
.objectives li span{font:700 11px var(--mono);color:var(--green);background:var(--lime-light);border-radius:6px;padding:3px 6px;flex:none}

.mission{position:relative;background:var(--lime-light);border:1px solid #cfe2a2;padding:16px 18px 16px 52px;border-radius:var(--radius);margin:24px 0 18px;font-size:15px;line-height:1.6}
.mission:before{content:'✳';position:absolute;left:17px;top:13px;font-size:22px;line-height:1;color:var(--pink)}
.mission b{display:block;font:700 11px/1.5 var(--mono);letter-spacing:.07em;color:var(--green);margin-bottom:4px}
.study-panel>p.takeaway,.takeaway{font-size:16px;font-weight:700;line-height:1.5;margin:22px 0 0;padding-top:16px;border-top:1px dashed var(--line-strong)}
.takeaway:before{content:'Para recordar';display:block;font:700 11px/1.6 var(--mono);letter-spacing:.07em;color:var(--muted);margin-bottom:4px;text-transform:uppercase}

/* ---------- Botones ---------- */
.primary{background:var(--ink);color:var(--paper);border:1px solid var(--ink);border-radius:12px;padding:13px 24px;display:inline-flex;align-items:center;justify-content:center;gap:14px;font-size:16px;font-weight:700;box-shadow:4px 4px 0 var(--lime);transition:transform .15s ease,box-shadow .15s ease}
.primary:hover:not(:disabled){transform:translate(-1px,-1px);box-shadow:5px 5px 0 var(--lime)}
.primary:active:not(:disabled){transform:translate(2px,2px);box-shadow:1px 1px 0 var(--lime)}
.primary:disabled{background:var(--card);color:var(--muted);border:1.5px dashed var(--line-strong);box-shadow:none}
.small-button,.secondary{border:1px solid var(--line-strong);border-radius:10px;background:var(--card);padding:9px 14px;font-size:14px;font-weight:650}
.small-button:hover,.secondary:hover{border-color:var(--ink)}
.text-button{border:0;background:none;text-decoration:underline;text-underline-offset:4px;padding:9px 2px;font-size:14px;color:var(--muted)}
.text-button:hover{color:var(--ink)}
.actions{display:flex;align-items:center;flex-wrap:wrap;gap:18px;margin-top:20px}
.actions a{display:inline-flex;align-items:center;min-height:44px;font-weight:650}

/* ---------- Índice del libro ---------- */
.chapter-card{position:relative;padding:22px 22px 22px;border:1px solid #c9d6a8;border-radius:18px;background:linear-gradient(160deg,#f2f7e3,#e8f0d2);margin-top:24px;box-shadow:var(--shadow);overflow:hidden}
.chapter-card:after{content:'';position:absolute;right:-38px;top:-38px;width:120px;height:120px;border-radius:50%;background:radial-gradient(circle at 40% 40%,#cdb7f0 0 22%,#f4c6d6 23% 60%,transparent 61%);opacity:.7;pointer-events:none}
.chapter-card h3{font-size:26px;margin-bottom:8px;position:relative}
.chapter-card p{font-size:15px;margin-bottom:16px;position:relative}
.chapter-card .primary{width:100%}
.chapter-card .kicker{margin-bottom:8px}
.badge{display:inline-block;font:700 11px/1.4 var(--mono);letter-spacing:.05em;padding:5px 9px;border-radius:999px;background:var(--lime);margin-bottom:12px;position:relative}
.upcoming{margin-top:26px;padding-top:18px;border-top:1px solid var(--line)}
.upcoming p{font:700 11px/1.6 var(--mono);letter-spacing:.06em;color:var(--muted);margin-bottom:10px}
.upcoming ol{list-style:none;counter-reset:lesson 1;padding:0;margin:0;display:grid;gap:2px}
.upcoming li{counter-increment:lesson;display:flex;align-items:center;gap:12px;padding:8px 0;font-size:15px;color:var(--muted)}
.upcoming li:before{content:counter(lesson,decimal-leading-zero);font:700 11px var(--mono);width:30px;height:30px;flex:none;display:grid;place-items:center;border:1.5px dashed var(--line-strong);border-radius:50%}

/* ---------- Panel del modelo ---------- */
.model-panel{background:var(--cream);border:1px solid #dad6c6;border-radius:22px;overflow:hidden;position:sticky;top:16px;box-shadow:var(--shadow)}
.model-top{padding:12px 18px;display:flex;justify-content:space-between;align-items:center;gap:12px;font:700 11px/1.4 var(--mono);letter-spacing:.07em;background:#f9f5ea;border-bottom:1px solid var(--line);color:var(--muted)}
.model-top>span:first-child{display:flex;align-items:center;gap:8px;color:var(--ink)}
#model-tag{background:var(--card);border:1px solid var(--line);border-radius:999px;padding:3px 9px}
.live-dot{height:8px;width:8px;background:#5c9a63;border-radius:50%;box-shadow:0 0 0 3px #5c9a6326}
/* El panel fijo debe caber entero en la ventana: la vista crece con la altura disponible */
.view{position:relative;height:clamp(300px,calc(100dvh - 470px),580px);background:radial-gradient(ellipse at 50% 45%,#fffdf6 18%,#f1eadc 92%);isolation:isolate;overflow:hidden}
.view:before{content:'';position:absolute;inset:0;background-image:radial-gradient(#adad963b .8px,transparent .8px);background-size:20px 20px;pointer-events:none}
.view canvas{position:absolute;inset:0;width:100%;height:100%;display:block;touch-action:none;cursor:grab}
.view canvas:active{cursor:grabbing}
.view-watermark{position:absolute;left:18px;top:16px;font:700 10px var(--mono);letter-spacing:.12em;color:#8a8b7c;pointer-events:none;z-index:1}
#viewer-status{position:absolute;left:14px;right:14px;top:40px;z-index:3;background:#fffdf7f2;border:1px solid var(--line);padding:12px 14px;font-size:14px;line-height:1.5;border-radius:10px;box-shadow:var(--shadow)}
#fallback{width:100%;height:100%;position:absolute;inset:0;padding:18px}
/* viewerError() asigna fallback.hidden=false, pero SVG no tiene la propiedad hidden y el
   atributo permanece. #view-toolbar solo se oculta en ese caso: lo usamos como señal. */
.model-panel:has(#view-toolbar[hidden]) #fallback{display:block!important;padding:30px 16px 84px}
.model-panel:has(#view-toolbar[hidden]) #viewer-status{top:auto;bottom:10px;left:10px;right:10px;padding:8px 12px;font-size:13px;line-height:1.4}

.map-labels{position:absolute;inset:0;pointer-events:none;z-index:2}
.map-labels button{position:absolute;transform:translate(-50%,-50%);padding:4px 11px 4px 8px;background:#fffdf7f2;border:1px solid #c9c4b3;border-radius:999px;font-size:13px;font-weight:650;line-height:1.2;min-height:34px;white-space:nowrap;pointer-events:auto;box-shadow:0 3px 10px #3b33201f;display:flex;align-items:center;gap:6px;transition:transform .15s ease,box-shadow .15s ease}
.map-labels button:hover{box-shadow:0 5px 14px #3b33202e}
.map-labels button:before{content:'';width:9px;height:9px;border-radius:50%;background:var(--part,#999);box-shadow:0 0 0 3px color-mix(in srgb,var(--part,#999) 22%,transparent)}
.map-labels span{display:none}
/* La membrana se ancla al borde derecho de la célula: la etiqueta crece hacia dentro */
.map-labels [data-anchor=membrane]{transform:translate(-88%,-50%)}
[data-part=membrane],[data-anchor=membrane]{--part:var(--membrane)}
[data-part=cytoplasm],[data-anchor=cytoplasm]{--part:var(--cytoplasm)}
[data-part=nucleus],[data-anchor=nucleus]{--part:var(--nucleus)}

.view-toolbar{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:12px 16px 0}
.segmented{display:flex;border:1px solid var(--line-strong);border-radius:12px;padding:3px;gap:2px;background:#efe9da}
.segmented button{border:0;background:transparent;border-radius:9px;padding:6px 14px;font-size:14px;font-weight:600;min-height:38px;color:var(--muted)}
.segmented button[aria-pressed=true]{background:var(--card);color:var(--ink);box-shadow:0 1px 4px #242b2024}
.segmented button:disabled{opacity:.45}
.camera-tools{display:flex;gap:4px;background:#efe9da;border:1px solid var(--line-strong);border-radius:12px;padding:3px}
.camera-tools button{border:0;background:transparent;font-size:20px;line-height:1;min-width:40px;min-height:38px;border-radius:9px}
.camera-tools button:hover{background:var(--card)}

.part-buttons{display:grid;grid-template-columns:repeat(auto-fit,minmax(100px,1fr));gap:8px;padding:12px 16px 0}
.part-buttons button{display:flex;align-items:center;justify-content:center;gap:8px;border:1.5px solid var(--line-strong);background:var(--card);border-radius:12px;padding:8px 10px;font-size:14px;font-weight:650;min-height:44px;transition:background .15s ease,border-color .15s ease}
.part-buttons button:hover{border-color:var(--part)}
.part-buttons button[aria-pressed=true]{border-color:var(--part);background:color-mix(in srgb,var(--part) 13%,#fffdf7);box-shadow:inset 0 0 0 1px var(--part)}
.part-buttons i{width:10px;height:10px;flex:none;border-radius:50%;background:var(--part)}

.part-info{margin:12px 16px 0;padding:14px 16px;font-size:14px;min-height:88px;background:var(--card);border:1px solid var(--line);border-radius:12px}
.part-info b{font-size:16px}
.part-info p{margin:4px 0 0;line-height:1.55;color:var(--muted);font-size:14px}
.model-note{font:11px/1.6 var(--mono);color:var(--muted);margin:0;padding:12px 18px 0}
.model-disclaimer{font:13px/1.5 var(--display);padding:6px 18px 16px;color:#62665c}

/* ---------- Recorrido de la proteína ---------- */
.model-panel:has(#process-controls:not([hidden])) .view{height:clamp(240px,calc(100dvh - 600px),500px)}
.process-controls{margin:12px 16px 0;padding:16px;background:var(--card);border:1px solid var(--line);border-radius:14px}
.process-heading{display:flex;justify-content:space-between;align-items:center;gap:10px;font-size:16px}
.process-heading span{font:700 11px var(--mono);white-space:nowrap;background:var(--pink-light);color:#9b2e5c;border-radius:999px;padding:3px 9px}
.process-inputs{display:flex;gap:14px;align-items:center;padding:12px 0 8px}
.process-inputs button{flex:none;min-width:136px;background:var(--ink);color:var(--paper);border-color:var(--ink)}
.process-inputs button:disabled{background:var(--card);color:var(--muted);border-color:var(--line-strong)}
.process-inputs input{accent-color:#c23d76;width:100%;min-width:0;min-height:44px}
.process-stops{display:grid;grid-template-columns:repeat(4,1fr);gap:6px}
.process-stops button{font-size:13px;font-weight:600;padding:6px 6px;min-width:0;border:1px solid var(--line);background:#f8f4ea;border-radius:10px;line-height:1.25}
.process-stops button[aria-current=step]{background:var(--pink-light);border-color:#c23d76;color:#7d2149;box-shadow:inset 0 0 0 1px #c23d76}
#process-description{font-size:15px;line-height:1.6;margin:12px 0 0;min-height:72px}

/* ---------- Preguntas ---------- */
.options{display:grid;gap:10px;margin:22px 0 0}
.options button{display:flex;align-items:center;gap:13px;width:100%;text-align:left;border:1.5px solid var(--line-strong);border-radius:14px;background:var(--card);padding:14px 16px;font-size:16px;line-height:1.45;min-height:56px;transition:border-color .15s ease,background .15s ease,transform .15s ease}
.options button:hover:not(:disabled){border-color:var(--ink);transform:translateX(2px)}
.options button[aria-pressed=true]{border-color:var(--ink);box-shadow:inset 0 0 0 1px var(--ink);background:#f6eef5}
.options button[aria-pressed=true] .option-letter{background:var(--ink);border-color:var(--ink);color:var(--paper)}
.option-letter{flex:none;font:700 12px var(--mono);width:30px;height:30px;display:grid;place-items:center;border:1.5px solid var(--line-strong);border-radius:8px;background:var(--paper)}
.options button:disabled{opacity:1;color:var(--ink)}
.options button.correct{background:var(--lime-light);border-color:#6a8c43;box-shadow:inset 0 0 0 1px #6a8c43}
.options button.correct .option-letter{background:#6a8c43;border-color:#6a8c43;color:#fff}
.options button.correct strong{color:#3d5f1f;white-space:nowrap}
.options button.incorrect{background:var(--warm-light);border-color:#b77a51}
.options button.incorrect .option-letter{background:#b77a51;border-color:#b77a51;color:#fff}
.options button.incorrect:after{content:'Tu elección' / '';margin-left:auto;flex:none;font:700 10px/1.3 var(--mono);letter-spacing:.04em;color:#8a4f2c;background:#fff;border:1px solid #e3c3ab;border-radius:999px;padding:3px 8px}
.options button:disabled:not(.correct):not(.incorrect){color:var(--muted);background:#faf6ec}

.feedback{position:relative;padding:18px 20px 18px 56px;background:var(--warm-light);border:1px solid #e1c2a8;border-radius:16px;margin:20px 0 0;font-size:16px}
.feedback:before{content:'↺';position:absolute;left:17px;top:15px;width:26px;height:26px;display:grid;place-items:center;border-radius:50%;background:#b77a51;color:#fff;font-size:15px;font-weight:700}
.feedback.success{background:var(--lime-light);border-color:#bfd59c}
.feedback.success:before{content:'✓';background:#6a8c43}
.feedback:focus{outline:none;box-shadow:0 0 0 3px #3d6fe055}
.feedback b{display:block;font-size:18px;margin-bottom:6px;letter-spacing:-.02em}
.feedback p{margin:0;line-height:1.6}
.feedback p+p{margin-top:8px}

/* ---------- Cierre ---------- */
.study-panel>p.summary-count,.summary-count{font-size:17px;padding:18px 20px;border-radius:16px;background:var(--lime-light);border:1px solid #cfe2a2}
.summary-count b{display:block;font-size:40px;line-height:1.05;letter-spacing:-.05em}
.summary-list{list-style:none;padding:0;font-size:15px;line-height:1.6;display:grid;gap:8px}
.summary-list li{margin:0;padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:var(--card)}
.summary-list a{font-weight:700;color:#9b2e5c}

/* ---------- Pie de la clase: siempre a mano ---------- */
.lesson-footer{position:sticky;bottom:0;z-index:6;display:flex;align-items:center;justify-content:space-between;gap:20px;border-top:1px solid var(--line);padding:14px 0;margin-top:28px;background:#fdf9efeb;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}
.lesson-footer:has(#next[hidden]){position:static;background:none}
.lesson-footer>span{font:11px/1.6 var(--mono);color:var(--muted);max-width:45ch}
.lesson-footer .primary{min-width:220px}
.sources{font-size:13px;color:var(--muted);max-width:780px;margin-top:8px}
.sources summary{cursor:pointer;min-height:44px;display:list-item;padding:10px 0}
.sources p{margin-bottom:10px}
.sources ul{padding-left:18px}
.warning{padding:12px 16px;background:#fff0dc;border-left:4px solid #af7444;border-radius:0 10px 10px 0;margin:15px 0 0;font-size:15px}

/* ---------- Piezas para las clases 2–6 (aún sin contenido integrado) ----------
   Contratos sugeridos; ver cell-lab/reviews/design-round-1.md. */
.chip-grid{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 0;padding:0;list-style:none}
.chip-grid button{display:inline-flex;align-items:center;gap:8px;border:1.5px solid var(--line-strong);background:var(--card);border-radius:999px;padding:7px 14px;font-size:14px;font-weight:650}
.chip-grid button:before{content:'';width:10px;height:10px;border-radius:50%;background:var(--part,var(--muted))}
.chip-grid button[aria-pressed=true]{border-color:var(--part,var(--ink));background:color-mix(in srgb,var(--part,var(--ink)) 13%,#fffdf7)}
.compare{width:100%;border-collapse:separate;border-spacing:0;margin:20px 0;font-size:15px;line-height:1.45;border:1px solid var(--line);border-radius:14px;overflow:hidden;background:var(--card)}
.compare caption{text-align:left;font:700 11px/1.6 var(--mono);letter-spacing:.06em;color:var(--muted);padding-bottom:8px}
.compare th,.compare td{padding:11px 12px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}
.compare thead th{background:#f3eee0;font-size:14px}
.compare tbody th{font-weight:650;width:34%}
.compare tr:last-child>*{border-bottom:0}
.compare .yes{color:#3d5f1f;font-weight:700}
.compare .no{color:#8a4f2c;font-weight:700}
.phase-strip{list-style:none;margin:20px 0;padding:0 0 6px;display:flex;gap:8px;overflow-x:auto;scroll-snap-type:x mandatory}
.phase-strip>li{flex:1 0 132px;scroll-snap-align:start}
.phase-strip button{width:100%;text-align:left;border:1.5px solid var(--line-strong);background:var(--card);border-radius:12px;padding:10px 12px;font-size:14px;font-weight:650;line-height:1.3}
.phase-strip button small{display:block;font:700 10px/1.5 var(--mono);color:var(--muted);letter-spacing:.05em}
.phase-strip button[aria-current=step]{border-color:var(--nucleus);background:color-mix(in srgb,var(--nucleus) 12%,#fffdf7);box-shadow:inset 0 0 0 1px var(--nucleus)}
.exam-meter{display:flex;gap:4px;margin:14px 0}
.exam-meter>span{flex:1;height:8px;border-radius:99px;background:#e6e4d6}
.exam-meter>.done{background:var(--lime)}
.exam-meter>.doubt{background:#e3a37a}
.exam-meter>.current{background:var(--ink)}

@media(min-width:741px) and (max-height:760px){
 .model-panel{position:relative;top:0}
}
@media(min-width:1400px){
 .study-panel>p{font-size:18px}
}
@media(max-width:1000px){
 .workspace{gap:24px;grid-template-columns:minmax(290px,.95fr) minmax(0,1.05fr)}
 .model-panel{top:10px}
 .part-buttons{padding-inline:12px;gap:6px}
 .part-buttons button{font-size:13px;padding-inline:6px}
 .process-stops{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:740px){
 .masthead{padding:10px 16px;gap:10px}
 .brand{font-size:30px}
 .book-label{display:none}
 .masthead nav{gap:4px}
 .masthead nav a{font-size:14px;padding:0 10px}
 main{padding:0 16px 20px}
 .page-heading{padding:18px 0 16px;display:block}
 #progress-wrap{width:100%;margin-top:12px}
 #progress-label{text-align:left;margin-bottom:6px}
 h1{font-size:36px}
 .workspace{display:flex;flex-direction:column;gap:20px}
 .model-panel{position:relative;top:0;width:100%;order:-1;border-radius:18px}
 .study-panel{width:100%;padding:0;max-width:none}
 .study-panel h2{font-size:30px;max-width:20ch;margin-bottom:16px}
 .study-panel>p{font-size:17px}
 .view{height:min(74vw,320px)}
 .model-panel:has(#process-controls:not([hidden])) .view{height:min(70vw,300px)}
 .model-top{padding:10px 14px}
 .view-toolbar{padding:10px 12px 0}
 .segmented button{padding-inline:12px}
 .part-buttons{padding:10px 12px 0;grid-template-columns:repeat(3,1fr)}
 .part-buttons button{font-size:14px;gap:6px}
 .part-info{min-height:0;margin:10px 12px 0;padding:12px 14px}
 .model-note{padding-inline:14px}
 .model-disclaimer{font-size:12px;padding:6px 14px 14px}
 .map-labels button{font-size:13px;min-height:36px}
 .map-labels [data-anchor=membrane]{transform:translate(-80%,45%)}
 .mission{margin:20px 0}
 /* Preguntas: primero el enunciado; en las de ubicar, el modelo justo después */
 .is-question .model-panel{order:0}
 .is-question:not(.is-pick) .model-panel{display:none}
 .is-pick .view{height:min(70vw,300px)}
 .process-controls{margin:10px 12px 0;padding:14px}
 .process-inputs{gap:10px}
 .process-inputs button{min-width:124px;font-size:14px}
 .process-stops button{font-size:13px;min-height:44px}
 .chapter-card{margin-top:18px;padding:20px 18px}
 .upcoming{margin-top:20px}
 .objectives{margin:16px 0}
 .lesson-footer{flex-direction:column-reverse;align-items:stretch;gap:6px;margin:20px -16px 0;padding:10px 16px calc(10px + env(safe-area-inset-bottom))}
 .lesson-footer>span{text-align:center;max-width:none;font-size:10px;line-height:1.4}
 .lesson-footer .primary{width:100%;min-height:52px}
 :root{--footer-h:96px}
 .options button{font-size:16px;padding:13px 14px}
 .summary-count b{font-size:34px}
}
@media(max-width:360px){
 .masthead nav a{padding:0 8px;font-size:13px}
 .study-panel h2{font-size:27px}
 .view-toolbar{flex-wrap:wrap}
 .part-buttons{grid-template-columns:1fr 1fr}
}
@media(prefers-reduced-motion:reduce){
 *,*:before,*:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}
}

/* ---------- Ronda 2 ----------
   .objectives li era flex: al insertar el glosario un <button> dentro del texto, cada
   trozo de texto pasaba a ser un elemento flex sin salto de línea y la lista desbordaba
   (588 px a 390). Bloque normal con el número colocado a la izquierda. */
.objectives li{display:block;position:relative;padding-left:58px}
.objectives li span{position:absolute;left:16px;top:17px;line-height:1.4}
@media(max-width:740px){
 .objectives li{padding:12px 14px 12px 52px}
 .objectives li span{left:14px;top:15px}
 .segmented button,.camera-tools button{min-height:44px}
 .camera-tools button{min-width:44px}
 .lesson-footer>span{font-size:11px}
}