:root{--bg:#f6f8fc;--card:#fff;--text:#172033;--muted:#657086;--line:#dde3ee;--accent:#365edc;--accent-soft:#edf2ff;--good:#147a4c;--good-bg:#eaf8f0;--bad:#b42318;--bad-bg:#fff0ef;--code:#121a2b;--shadow:0 14px 40px rgba(35,48,83,.08)}
*{box-sizing:border-box}html{min-height:100%}body{margin:0;min-height:100vh;font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;background:linear-gradient(180deg,#f9fbff 0,#f4f7fc 100%);color:var(--text)}button,input,select,textarea{font:inherit}.topbar{height:74px;background:rgba(255,255,255,.92);border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 max(22px,5vw);position:sticky;top:0;z-index:20;backdrop-filter:blur(8px)}.brand{display:flex;align-items:center;gap:11px;border:0;background:transparent;cursor:pointer;text-align:left;color:var(--text);padding:0}.brand-mark{width:38px;height:38px;display:grid;place-items:center;border-radius:12px;background:var(--accent);color:#fff;font-size:20px;font-weight:800}.brand strong,.brand small{display:block}.brand strong{font-size:15px}.brand small{font-size:11px;color:var(--muted);margin-top:2px}main{width:min(960px,calc(100% - 36px));margin:0 auto;padding:52px 0 76px}.view{display:none}.view.active{display:block}.home-view{padding-top:42px}.welcome{text-align:center;max-width:720px;margin:0 auto 36px}.eyebrow{display:inline-block;font-size:11px;font-weight:800;letter-spacing:.12em;color:var(--accent);margin-bottom:9px}.welcome h1,.screen-head h2{font-size:clamp(32px,5vw,48px);line-height:1.08;margin:5px 0 13px;letter-spacing:-.035em}.welcome p,.screen-head p{margin:0;color:var(--muted);font-size:17px;line-height:1.6}.choice-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.choice-card{border:1px solid var(--line);background:#fff;border-radius:22px;padding:30px;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:18px;cursor:pointer;text-align:left;color:var(--text);box-shadow:var(--shadow);transition:.18s ease}.choice-card:hover{transform:translateY(-3px);border-color:#b9c8f8}.choice-icon{width:62px;height:62px;border-radius:18px;background:var(--accent-soft);display:grid;place-items:center;font-size:29px}.choice-copy strong,.choice-copy small{display:block}.choice-copy strong{font-size:26px;margin-bottom:7px}.choice-copy small{color:var(--muted);font-size:14px;line-height:1.45}.arrow{font-size:25px;color:var(--accent)}.card{background:var(--card);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow)}.screen-head{position:relative;margin-bottom:25px}.screen-head.centered{text-align:center}.back{border:0;background:transparent;color:var(--muted);font-weight:700;cursor:pointer;padding:6px 0;margin-bottom:26px}.back:hover{color:var(--accent)}.left-back{position:absolute;left:0;top:-2px}.selector-card,.start-card{padding:22px;margin-bottom:20px}.selector-card label,.start-card label{display:block;font-weight:750;margin-bottom:8px}.selector-card select,.start-card select,.match-grid select{width:100%;border:1px solid var(--line);background:#fff;border-radius:12px;padding:13px 14px;color:var(--text);outline:none}.selector-card select:focus,.start-card select:focus,.answer-input:focus,.match-grid select:focus{border-color:#9fb2f5;box-shadow:0 0 0 4px var(--accent-soft)}.study-content{padding:34px}.study-content h2{font-size:30px;margin:12px 0}.study-summary,.study-content li{line-height:1.7}.study-summary{font-size:17px;color:#44506a}.study-content h3{margin:29px 0 10px}.study-content li{margin:7px 0}.pill{display:inline-block;background:var(--accent-soft);color:var(--accent);padding:6px 10px;border-radius:999px;font-size:11px;font-weight:800}.code{background:var(--code);color:#f8fafc;border-radius:14px;padding:18px;overflow:auto;font-family:Consolas,"Courier New",monospace;line-height:1.55;white-space:pre-wrap}.tip{margin-top:20px;padding:15px 17px;border-radius:12px;background:#fff8e5;border-left:4px solid #e0a000;line-height:1.55}.study-action{text-align:right;margin-top:18px}.start-card{max-width:610px;margin:42px auto 0;padding:32px}.start-card select{font-size:16px}.quiz-info{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0}.quiz-info span{background:#f5f7fb;border:1px solid var(--line);border-radius:999px;padding:7px 10px;color:var(--muted);font-size:12px}.protector-note{text-align:center;color:var(--muted);font-size:12px;line-height:1.5;margin:14px 0 0}.primary,.secondary{border-radius:11px;padding:12px 17px;font-weight:800;cursor:pointer;transition:.15s ease}.primary{border:1px solid var(--accent);background:var(--accent);color:#fff}.primary:hover{filter:brightness(.96)}.secondary{border:1px solid var(--line);background:#fff;color:var(--text)}.wide{width:100%;margin-top:8px}.quiz-shell{max-width:850px;margin:0 auto}.quiz-header{display:flex;justify-content:space-between;align-items:end;gap:18px}.progress-text{font-size:13px;color:var(--muted);margin-top:7px}.timer-box{min-width:88px;text-align:center;background:#fff;border:1px solid var(--line);padding:9px 14px;border-radius:13px}.timer-box span{display:block;font-size:10px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-weight:800}.timer-box strong{font-size:23px}.progress{height:8px;background:#e0e6f0;border-radius:999px;margin:14px 0 22px;overflow:hidden}.progress div{height:100%;background:var(--accent);transition:.25s}.question-card{padding:34px}.type-label{font-size:10px;text-transform:uppercase;letter-spacing:.13em;font-weight:850;color:var(--muted)}.question-card h2{font-size:24px;line-height:1.4;margin:10px 0 18px}.options{display:grid;gap:10px}.option{display:flex;align-items:center;gap:12px;width:100%;border:1px solid var(--line);border-radius:12px;padding:13px 14px;cursor:pointer;background:#fff;color:var(--text);text-align:left}.option:hover{border-color:#aabaf0}.option.selected{background:var(--accent-soft);border-color:var(--accent)}.option-letter{min-width:29px;height:29px;display:grid;place-items:center;border-radius:8px;background:#f1f4f9;font-size:12px;font-weight:850}.option.selected .option-letter{background:var(--accent);color:#fff}.answer-input{width:100%;min-height:48px;padding:13px 14px;border:1px solid var(--line);border-radius:12px;outline:none;font-family:Consolas,"Courier New",monospace}.answer-input.multiline{min-height:125px}.instruction{color:var(--muted);font-size:14px}.sortable{list-style:none;padding:0;display:grid;gap:9px}.sortable li{border:1px solid var(--line);background:#fff;border-radius:11px;padding:12px 14px;cursor:grab;font-family:Consolas,"Courier New",monospace}.sortable li.dragging{opacity:.4}.match-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;align-items:center}.match-term{border:1px solid var(--line);border-radius:10px;padding:12px;font-weight:750;background:#f8faff}.feedback{margin-top:18px;padding:14px 16px;border-radius:12px}.feedback strong,.feedback span{display:block}.feedback p{margin:7px 0 0;line-height:1.55}.feedback.good{background:var(--good-bg);color:var(--good)}.feedback.bad{background:var(--bad-bg);color:var(--bad)}.quiz-actions{display:flex;justify-content:flex-end;margin-top:20px}.exam-notice{text-align:center;margin-top:13px;font-size:11px;color:#8a6600}.results-card{max-width:650px;margin:45px auto 0;padding:42px;text-align:center}.results-card h2{font-size:31px;margin:8px 0}.score{font-size:60px;font-weight:850;letter-spacing:-.04em;margin:15px 0 3px}.result-percent{font-size:18px;color:var(--muted)}.result-actions{display:flex;justify-content:center;gap:9px;flex-wrap:wrap;margin-top:27px}.overlay{position:fixed;inset:0;background:rgba(9,15,30,.72);z-index:99;display:grid;place-items:center;padding:20px}.overlay-card{width:min(520px,100%);padding:32px}.overlay-card h2{font-size:29px;margin:6px 0 10px}.overlay-card p{color:var(--muted);line-height:1.6}.hidden{display:none!important}
@media(max-width:720px){main{width:min(100% - 24px,960px);padding-top:30px}.choice-grid{grid-template-columns:1fr}.choice-card{padding:22px}.screen-head.centered{text-align:left}.left-back{position:static}.study-content,.question-card,.start-card,.results-card{padding:24px}.match-grid{grid-template-columns:1fr}.quiz-info{display:grid}.quiz-header{align-items:center}.welcome h1,.screen-head h2{font-size:34px}}
.student-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:22px}.field label{display:block;font-weight:750;margin-bottom:7px}.field input{width:100%;border:1px solid var(--line);background:#fff;border-radius:12px;padding:12px 13px;color:var(--text);outline:none}.field input:focus{border-color:#9fb2f5;box-shadow:0 0 0 4px var(--accent-soft)}.wide-field{grid-column:1/-1}.report-status{margin:18px 0 0;padding:14px 16px;border-radius:12px;background:#f5f7fb;color:var(--muted);font-size:13px;line-height:1.55;text-align:left}.report-status strong{color:var(--text)}
@media(max-width:720px){.student-grid{grid-template-columns:1fr}.wide-field{grid-column:auto}}
/* Curso autoasistido: lecciones, laboratorio y desafíos */
.study-content{padding:0;box-shadow:none;border:0;background:transparent}.study-intro{padding:27px 31px;margin-bottom:16px;background:linear-gradient(120deg,#fff,#f0f5ff)}.study-intro h2{font-size:30px;letter-spacing:-.025em;margin:12px 0}.study-intro p{color:#45536d;line-height:1.6;margin-bottom:14px}.study-microinfo{display:flex;gap:10px;flex-wrap:wrap;font-size:12px;color:#405682;font-weight:700}.study-microinfo span{padding:8px 10px;border-radius:9px;background:#fff;border:1px solid #e1e9fc}.study-tabs{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 16px}.study-tab{background:#fff;border:1px solid var(--line);padding:12px 15px;border-radius:11px;font-size:14px;font-weight:750;color:#56627a;cursor:pointer;transition:.15s}.study-tab.active{background:#335bd8;color:#fff;border-color:#335bd8}.study-tab:hover:not(.active){border-color:#9caee7;background:#f7f9ff}.study-tab span{opacity:.82;font-size:12px}.study-panel{display:grid;gap:18px}.study-chapter{padding:28px 31px}.study-chapter h3{font-size:24px;margin:6px 0 18px;letter-spacing:-.02em}.study-chapter p{font-size:16px;line-height:1.82;color:#3c495f;margin:0 0 16px}.chapter-no{font-size:11px;letter-spacing:.1em;color:#476bcb;font-weight:800}.code-title,.console-title{font-size:12px;color:#4d5d7b;font-weight:800;display:flex;align-items:center;justify-content:space-between;margin-top:22px;margin-bottom:6px}.copy-code{border:1px solid #dae4f2;border-radius:8px;background:#f5f8ff;color:#365edc;padding:5px 9px;font-size:12px;cursor:pointer}.study-chapter pre.code{font-size:14px;line-height:1.7;tab-size:4;white-space:pre;overflow-x:auto}.sample-output{margin:0;padding:16px 18px;border:1px solid #d9e4e8;border-radius:12px;background:#f1f8fa;color:#183846;font:14px/1.6 Consolas,"Courier New",monospace;white-space:pre-wrap;min-height:48px;overflow-x:auto}.lesson-explain{padding:14px 16px;border-radius:11px;background:#f3f0ff;color:#473779;line-height:1.7;margin-top:15px;border-left:4px solid #9681df}.study-forward{text-align:right;padding:7px 0 10px}.trace-card,.check-card,.study-help{padding:28px 31px}.trace-card h3,.check-card h3,.study-help h3{font-size:24px;margin:0 0 12px}.trace-card p,.check-card>p,.study-help p{line-height:1.75;color:#526079}.trace-card>label{display:block;font-size:13px;font-weight:750;margin:17px 0 7px}.trace-card>select{border:1px solid #dce4f0;background:#fff;padding:11px;border-radius:10px;min-width:min(100%,290px)}.trace-grid{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);gap:16px;margin-top:19px}.trace-grid .code-title{margin:0 0 9px}.trace-source{background:#121a2b;color:#f2f5fc;border-radius:13px;margin:0;overflow:auto;padding:12px 4px;min-height:275px;font:13px/1.65 Consolas,"Courier New",monospace;white-space:pre;tab-size:4}.trace-line{padding:2px 11px;display:flex;gap:12px;border-left:3px solid transparent}.trace-line.running{background:#30447a;border-left-color:#f6d477}.line-num{color:#9ba9bf;width:24px;text-align:right;flex:none;user-select:none}.trace-vars{display:grid;gap:7px;min-height:90px;align-content:start}.trace-vars>p{font-size:13px}.var-chip{background:#f4f7fd;border:1px solid #e0e6f2;padding:7px 11px;border-radius:9px;display:flex;justify-content:space-between;gap:8px;font-size:13px;word-break:break-word}.var-chip span{color:#50627e}.var-chip strong{color:#1d3371}.trace-output{margin-top:5px;min-height:100px}.trace-note{background:#fff8e6;border-left:4px solid #d99f18;padding:14px 15px;border-radius:9px;line-height:1.65;margin-top:18px;min-height:72px}.trace-controls{display:flex;align-items:center;justify-content:space-between;gap:15px;flex-wrap:wrap;margin-top:17px}.trace-controls>div{display:flex;gap:9px;flex-wrap:wrap}.trace-controls>span{font-size:13px;color:#56627a}.primary:disabled{opacity:.6;cursor:default}.check-item{padding:22px 0;border-top:1px solid var(--line)}.check-item h4{font-size:18px;line-height:1.5;margin:9px 0 14px}.check-head{color:#4466c4;font-size:12px;font-weight:800}.check-answers{display:grid;gap:9px;margin:12px 0 15px}.check-answers label{border:1px solid #e2e7f0;border-radius:10px;display:flex;align-items:center;gap:11px;padding:12px 14px;cursor:pointer;line-height:1.5}.check-answers label:has(input:checked){border-color:#5977d5;background:#f0f4ff}.check-answers input{accent-color:#365edc;width:17px;height:17px;flex:none}.check-feedback{padding:14px 16px;border-radius:10px;line-height:1.6;margin-top:11px}.check-feedback.good{color:#0d5f3e;background:#eaf8f0}.check-feedback.bad{color:#8e331f;background:#fff1ec}.check-feedback p{margin:5px 0}.study-complete{padding:12px 16px;background:#f1f5fe;color:#3153a5;border-radius:10px;line-height:1.6;margin-top:8px;font-weight:650}
@media(max-width:760px){.study-intro,.study-chapter,.trace-card,.check-card,.study-help{padding:20px}.trace-grid{grid-template-columns:1fr}.trace-source{min-height:170px;font-size:12px}.study-chapter h3{font-size:21px}.study-chapter p{font-size:15px}.study-tabs{display:grid;grid-template-columns:repeat(3,1fr);gap:5px}.study-tab{padding:10px 3px;font-size:12px}.study-microinfo{gap:6px}.trace-controls{justify-content:space-between}}