:root{color-scheme:dark;--bg:#0b1220;--bg2:#101a2b;--surface:#152238;--surface2:#1C2E49;--text:#edf4fb;--muted:#94a3b8;--border:#29415F;--border-strong:#4E6B91;--blue:#3B82F6;--blue2:#60A5FA;--blue-soft:#122B50;--yellow:#F9C74F;--green:#48C78E;--red:#FF6B7A;--code:#07101C;--code2:#0D192A;--focus:#F9C74F;--shadow:0 18px 60px rgba(0,0,0,.22);--radius:16px;--container:1160px;--reading:760px;font-family:ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:86px}body{margin:0;background:var(--bg);color:var(--text);line-height:1.68;-webkit-font-smoothing:antialiased}a{color:var(--blue);text-underline-offset:3px}a:hover{color:var(--blue2)}button,input,textarea,select{font:inherit}button{cursor:pointer}img,svg{max-width:100%}h1,h2,h3,h4{line-height:1.15;margin:0 0 16px;text-wrap:balance}h1,h2{letter-spacing:-.025em}h3,h4{letter-spacing:-.01em}h1{font-size:clamp(2.35rem,6vw,4.5rem)}h2{font-size:clamp(1.65rem,3.5vw,2.35rem)}h3{font-size:1.25rem}p,ul,ol{margin-top:0;margin-bottom:16px}.container{width:min(calc(100% - 32px),var(--container));margin-inline:auto}.narrow{width:min(calc(100% - 32px),var(--reading));margin-inline:auto}.section{padding:72px 0}.section-soft{background:var(--bg2);border-block:1px solid var(--border)}.skip-link{position:fixed;z-index:9999;top:10px;left:10px;transform:translateY(-180%);background:var(--text);color:var(--bg);padding:10px 14px;border-radius:10px}.skip-link:focus{transform:none}.site-header{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg) 92%,transparent);backdrop-filter:blur(14px);border-bottom:1px solid var(--border)}.nav{height:66px;display:flex;align-items:center;gap:18px}.brand{display:inline-flex;align-items:center;gap:9px;color:var(--text);font-weight:800;text-decoration:none;letter-spacing:-.02em}.brand-mark{display:grid;place-items:center;width:38px;height:38px;border-radius:12px;background:linear-gradient(135deg,var(--blue),#2563EB);color:var(--bg);font-weight:900;box-shadow:inset 0 -3px 0 rgba(0,0,0,.12)}.brand-soft{font-weight:600;color:var(--muted)}.nav-links{display:flex;align-items:center;gap:2px;margin-left:auto}.nav-links a{color:var(--muted);font-size:.92rem;font-weight:700;text-decoration:none;padding:9px 10px;border-radius:10px}.nav-links a:hover,.nav-links a[aria-current=page]{background:var(--surface2);color:var(--text)}.nav-actions{display:flex;gap:7px}.icon-btn,.menu-btn{border:1px solid var(--border);background:var(--surface);color:var(--text);min-height:40px;border-radius:10px;padding:8px 11px}.menu-btn{display:none}.eyebrow{text-transform:uppercase;letter-spacing:.1em;color:var(--blue);font-size:.78rem;font-weight:900}.lead{color:var(--muted);font-size:clamp(1.08rem,2.2vw,1.3rem);max-width:720px}.hero{padding:82px 0 64px;overflow:hidden}.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:50px;align-items:center}.hero h1 em{font-style:normal;color:var(--blue)}.actions{display:flex;flex-wrap:wrap;gap:11px;margin-top:25px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:10px 16px;border-radius:12px;border:1px solid transparent;text-decoration:none;font-weight:800}.btn-primary{background:var(--blue);color:var(--bg)}.btn-primary:hover{background:var(--blue2);color:var(--bg)}.btn-secondary{background:var(--surface);color:var(--text);border-color:var(--border)}.btn-secondary:hover{background:var(--surface2);color:var(--text)}.python-window{background:var(--code);border:1px solid color-mix(in srgb,var(--blue) 25%,var(--border));border-radius:22px;box-shadow:var(--shadow);overflow:hidden}.window-top{display:flex;align-items:center;justify-content:space-between;padding:12px 15px;background:var(--code2);color:#b9c6d8;font-size:.82rem}.dots{display:flex;gap:6px}.dots i{width:10px;height:10px;border-radius:50%;display:block;background:#44546a}.dots i:nth-child(1){background:#ff6b6b}.dots i:nth-child(2){background:#F9C74F}.dots i:nth-child(3){background:#48C78E}.code{margin:0;padding:24px;color:#e9f1fb;overflow:auto;font:15px/1.7 ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono",monospace}.code .kw{color:#F9C74F}.code .str{color:#86E0AC}.code .fn{color:#60A5FA}.result{border-top:1px solid #29415F;padding:15px 24px;color:#9EE5BB;font:14px ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono",monospace}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:28px}.stat{border:1px solid var(--border);background:var(--surface);padding:14px;border-radius:13px}.stat b{font-size:1.35rem;display:block}.stat span{color:var(--muted);font-size:.86rem}.section-head{display:flex;justify-content:space-between;gap:28px;align-items:end;margin-bottom:30px}.section-head p{max-width:520px;color:var(--muted);margin:0}.grid-2,.grid-3,.grid-4{display:grid;gap:16px}.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}.card,.route-card,.lesson-card,.tool-card,.error-card{border:1px solid var(--border);background:var(--surface);border-radius:var(--radius);padding:22px;box-shadow:0 1px 0 rgba(0,0,0,.02)}.card p,.route-card p,.lesson-card p,.tool-card p,.error-card p{color:var(--muted)}.card-icon{width:38px;height:38px;border-radius:11px;display:grid;place-items:center;background:var(--blue-soft);color:var(--blue);font-weight:900;margin-bottom:15px}.route-card{display:block;text-decoration:none;color:var(--text);transition:transform .15s,border-color .15s}.route-card:hover{transform:translateY(-2px);border-color:var(--blue);color:var(--text)}.route-card-primary{background:linear-gradient(135deg,var(--blue-soft),var(--surface))}.route-action{color:var(--blue);font-weight:800}.check-list{list-style:none;padding:0}.check-list li{position:relative;padding-left:27px;margin:8px 0}.check-list li:before{content:"✓";position:absolute;left:0;color:var(--green);font-weight:900}.split{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:start}.feature{padding:20px 0;border-top:1px solid var(--border)}.feature-number{font-weight:900;color:var(--blue)}.page-hero{padding:58px 0 38px;background:linear-gradient(180deg,var(--bg2),var(--bg))}.breadcrumbs{font-size:.85rem;color:var(--muted);margin-bottom:14px}.breadcrumbs a{color:var(--muted)}.course-shell{display:grid;grid-template-columns:250px minmax(0,1fr);gap:42px;padding:38px 0 74px}.course-sidebar{position:sticky;top:88px;align-self:start}.course-sidebar h2{font-size:1rem}.course-sidebar a{display:block;padding:7px 9px;border-radius:9px;text-decoration:none;color:var(--muted);font-size:.9rem}.course-sidebar a:hover,.course-sidebar a.current{background:var(--surface2);color:var(--text)}.lesson-content{max-width:790px}.lesson-content>section{padding:26px 0;border-bottom:1px solid var(--border)}.lesson-meta{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0}.pill{border:1px solid var(--border);background:var(--surface2);border-radius:999px;padding:5px 9px;color:var(--muted);font-size:.8rem}.code-block{background:var(--code);border:1px solid var(--border);border-radius:14px;overflow:hidden;margin:17px 0}.code-block .bar{padding:8px 12px;background:var(--code2);color:#aebdce;font-size:.78rem}.code-block pre{margin:0;padding:18px;overflow:auto;color:#eaf1f9;font:15px/1.65 ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono",monospace}.practice-box{border:1px solid color-mix(in srgb,var(--blue) 45%,var(--border));background:var(--blue-soft);border-radius:16px;padding:19px}.editor{border:1px solid var(--border);border-radius:15px;background:var(--surface);overflow:hidden}.editor-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 12px;border-bottom:1px solid var(--border);background:var(--surface2)}.editor textarea{width:100%;min-height:210px;border:0;outline:0;resize:vertical;background:var(--code);color:#eef5ff;padding:17px;font:15px/1.6 ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono",monospace;tab-size:4}.output{min-height:80px;white-space:pre-wrap;margin:0;padding:14px 17px;background:var(--code2);color:#9EE5BB;border-top:1px solid #29415F;font:14px/1.6 ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono",monospace}.run-btn{border:0;background:var(--blue);color:var(--bg);border-radius:9px;padding:8px 12px;font-weight:800}.run-btn:disabled{opacity:.6;cursor:wait}.lesson-nav{display:flex;justify-content:space-between;gap:12px;margin-top:28px}.lesson-nav a{max-width:48%;text-decoration:none;border:1px solid var(--border);border-radius:13px;padding:12px 14px;color:var(--text)}.lesson-nav a:hover{border-color:var(--blue)}.complete-btn{width:100%;border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:12px;padding:12px;font-weight:800}.complete-btn.done{background:var(--green);border-color:var(--green);color:var(--bg)}.module{margin:32px 0}.module-head{display:flex;align-items:center;gap:12px;margin-bottom:12px}.module-num{display:grid;place-items:center;width:38px;height:38px;border-radius:11px;background:var(--blue-soft);color:var(--blue);font-weight:900}.lesson-list{display:grid;grid-template-columns:repeat(2,1fr);gap:11px}.lesson-card{display:flex;gap:13px;text-decoration:none;color:var(--text);padding:16px}.lesson-card:hover{border-color:var(--blue);color:var(--text)}.lesson-card.is-done{background:color-mix(in srgb,var(--green) 7%,var(--surface));border-color:color-mix(in srgb,var(--green) 35%,var(--border))}.lesson-card.is-done .lesson-index{color:var(--green)}.lesson-index{color:var(--blue);font-weight:900;min-width:28px}.lesson-card small{display:block;color:var(--muted);margin-top:4px}.progress-wrap{height:10px;background:var(--surface2);border-radius:999px;overflow:hidden}.progress-bar{height:100%;background:linear-gradient(90deg,var(--blue),var(--yellow));width:0}.progress-row{display:flex;justify-content:space-between;color:var(--muted);font-size:.9rem;margin-top:7px}.search{width:100%;border:1px solid var(--border);background:var(--surface);color:var(--text);padding:11px 13px;border-radius:11px}.search:focus{outline:3px solid color-mix(in srgb,var(--focus) 25%,transparent);border-color:var(--focus)}.glossary-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.term-card{border:1px solid var(--border);border-radius:13px;padding:15px;background:var(--surface)}.term-card dt{font-weight:900}.term-card dd{margin:5px 0 0;color:var(--muted)}.challenge{margin:16px 0}.status{font-weight:800}.status.ok{color:var(--green)}.status.bad{color:var(--red)}.legal-note{border-left:4px solid var(--yellow);background:color-mix(in srgb,var(--yellow) 12%,var(--surface));padding:14px 16px;border-radius:0 12px 12px 0}.footer{border-top:1px solid var(--border);background:var(--bg2);padding:52px 0 22px}.footer-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:34px}.footer h3{font-size:1rem}.footer a{display:block;margin:8px 0;color:var(--muted);text-decoration:none}.footer a:hover{color:var(--text)}.footer .brand{display:inline-flex;color:var(--text)}.footer-bottom{display:flex;justify-content:space-between;gap:20px;border-top:1px solid var(--border);margin-top:35px;padding-top:19px;color:var(--muted);font-size:.84rem}.privacy-grid{display:grid;grid-template-columns:1fr auto;gap:12px;align-items:center;border:1px solid var(--border);border-radius:14px;padding:16px;margin:12px 0}.toggle{position:relative;width:48px;height:28px}.toggle input{opacity:0;width:0;height:0}.toggle span{position:absolute;inset:0;background:var(--border);border-radius:99px;transition:.2s}.toggle span:before{content:"";position:absolute;width:22px;height:22px;left:3px;top:3px;background:#fff;border-radius:50%;transition:.2s}.toggle input:checked+span{background:var(--green)}.toggle input:checked+span:before{transform:translateX(20px)}
@media(max-width:900px){.nav-links{display:none;position:absolute;top:66px;left:16px;right:16px;background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow);border-radius:14px;padding:10px;flex-direction:column;align-items:stretch}.nav-links.open{display:flex}.menu-btn{display:block}.hero-grid,.split,.course-shell{grid-template-columns:1fr}.course-sidebar{position:static}.grid-4{grid-template-columns:repeat(2,1fr)}.grid-3,.glossary-grid{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.section{padding:52px 0}.hero{padding:54px 0}.hero-grid{gap:30px}.stats{grid-template-columns:repeat(2,1fr)}.grid-2,.grid-3,.grid-4,.glossary-grid,.lesson-list,.footer-grid{grid-template-columns:1fr}.section-head,.footer-bottom{display:block}.footer-bottom span{display:block;margin:8px 0}.lesson-nav{flex-direction:column}.lesson-nav a{max-width:none}.brand-soft{display:none}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

/* pedagogical lesson components */
.lesson-start{padding-top:0!important}.lesson-note,.prediction,.mistake{border:1px solid var(--border);background:var(--surface2);border-radius:14px;padding:17px 18px}.lesson-note p,.prediction p,.mistake p{margin-bottom:0}.mini-label{display:block;text-transform:uppercase;letter-spacing:.08em;font-size:.72rem;font-weight:900;color:var(--blue);margin-bottom:6px}.step-list{padding-left:1.35rem}.step-list li{margin:9px 0;padding-left:4px}details.answer,details.hints{margin-top:12px}details.answer summary,details.hints summary{cursor:pointer;font-weight:800;color:var(--blue)}details.answer p,details.hints ul{margin:10px 0 0}.mistake{border-left:4px solid var(--yellow)}.practice-goal{margin:14px 0;border:1px dashed color-mix(in srgb,var(--blue) 45%,var(--border));border-radius:12px;padding:10px 12px;background:var(--surface)}.practice-goal pre{margin:0;white-space:pre-wrap;color:var(--text);font:13.5px/1.5 ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono",monospace}.practice-box .status:empty{display:none}.lesson-content code:not(pre code){background:var(--surface2);border:1px solid var(--border);border-radius:5px;padding:.06em .28em;font-size:.9em}

/* Enhanced supporting pages */
.jump-links{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 0}.jump-links a{display:inline-flex;padding:7px 10px;border:1px solid var(--border);border-radius:999px;background:var(--surface);color:var(--muted);text-decoration:none;font-size:.88rem;font-weight:700}.jump-links a:hover{border-color:var(--blue);color:var(--text)}
.callout{border:1px solid color-mix(in srgb,var(--blue) 28%,var(--border));background:color-mix(in srgb,var(--blue) 7%,var(--surface));padding:18px;border-radius:14px;margin:20px 0}.callout strong:first-child{display:block;margin-bottom:5px}.callout-warning{border-color:color-mix(in srgb,var(--yellow) 50%,var(--border));background:color-mix(in srgb,var(--yellow) 10%,var(--surface))}.callout-success{border-color:color-mix(in srgb,var(--green) 40%,var(--border));background:color-mix(in srgb,var(--green) 8%,var(--surface))}
.step-list{counter-reset:steps;list-style:none;padding:0;margin:20px 0}.step-list>li{counter-increment:steps;position:relative;padding:0 0 20px 52px;min-height:42px}.step-list>li:before{content:counter(steps);position:absolute;left:0;top:-3px;display:grid;place-items:center;width:36px;height:36px;border-radius:11px;background:var(--blue-soft);color:var(--blue);font-weight:900}.step-list>li+li{border-top:1px solid var(--border);padding-top:20px}.step-list>li+li:before{top:17px}
.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:20px 0}.compare-grid .card{height:100%}.mini-label{font-size:.76rem;text-transform:uppercase;letter-spacing:.09em;color:var(--blue);font-weight:900;margin-bottom:7px}.muted{color:var(--muted)}.answer{border-left:3px solid var(--blue);padding-left:14px;margin:12px 0 22px}.check-question{font-weight:800;margin-bottom:6px}
details.hint,details.faq-item{border:1px solid var(--border);background:var(--surface);border-radius:13px;padding:13px 15px;margin:10px 0}details.hint summary,details.faq-item summary{cursor:pointer;font-weight:800;color:var(--text)}details.hint[open] summary,details.faq-item[open] summary{margin-bottom:10px}details.hint p:last-child,details.faq-item p:last-child{margin-bottom:0}
.practice-intro{display:grid;grid-template-columns:1.15fr .85fr;gap:18px;align-items:start}.exercise-meta{display:flex;flex-wrap:wrap;gap:7px;margin:10px 0 14px}.badge{display:inline-flex;align-items:center;border:1px solid var(--border);background:var(--surface2);color:var(--muted);border-radius:999px;padding:4px 8px;font-size:.77rem;font-weight:800}.expected{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono",monospace;background:var(--surface2);border:1px solid var(--border);border-radius:8px;padding:2px 6px}.concept-pair{border-top:1px solid var(--border);padding:20px 0}.concept-pair:first-child{border-top:0}.term-card dd code{font-size:.9em}.term-card dd small{display:block;margin-top:7px;color:var(--muted)}
.error-anatomy{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:22px 0}.error-anatomy .card h3{font-size:1.05rem}.diagnostic-list li{margin-bottom:9px}.related-links{display:flex;flex-wrap:wrap;gap:9px;margin-top:20px}.related-links a{padding:9px 12px;border-radius:10px;background:var(--surface2);border:1px solid var(--border);text-decoration:none;font-weight:700;color:var(--text)}
.legal-checklist{border:1px dashed var(--border);background:var(--surface2);padding:18px;border-radius:14px;margin:20px 0}.legal-checklist h3{font-size:1rem}.legal-checklist ul{margin-bottom:0}
@media(max-width:760px){.compare-grid,.practice-intro,.error-anatomy{grid-template-columns:1fr}}

/* Pedagogía personalizada v3 */
.learning-evidence{margin-top:14px;padding-top:14px;border-top:1px solid var(--border)}
.learning-evidence p{margin:0;font-weight:600}
.activity-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:18px 0}
.activity-card,.transfer-box,.interpretation-box,.project-done,.type-diagnostic,.contract-card,.path-map,.diagnostic-tree,.regex-build,.progression{border:1px solid var(--border);background:var(--surface);border-radius:14px;padding:16px;margin:16px 0}
.activity-card h3{font-size:1.03rem;margin-bottom:8px}.activity-card p:last-child{margin-bottom:0}
.concept-flow{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:10px;margin:18px 0;padding:15px;border:1px solid var(--border);border-radius:14px;background:var(--surface2)}
.concept-flow span{padding:7px 10px;border-radius:9px;background:var(--surface);border:1px solid var(--border);font-weight:700}.concept-flow b{color:var(--blue)}
.trace-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:16px 0}.trace-strip span{border:1px solid var(--border);border-radius:10px;padding:10px;background:var(--surface2);text-align:center;font-size:.92rem}
.trace-table,.rubric-table{width:100%;border-collapse:collapse;margin:18px 0;background:var(--surface);border:1px solid var(--border);border-radius:12px;overflow:hidden}
.trace-table th,.trace-table td,.rubric-table th,.rubric-table td{padding:10px 12px;border-bottom:1px solid var(--border);text-align:left;vertical-align:top}.trace-table th,.rubric-table th{background:var(--surface2)}
.trace-table tr:last-child td,.rubric-table tr:last-child td{border-bottom:0}
.input-lab{border:1px solid color-mix(in srgb,var(--blue) 45%,var(--border));background:var(--blue-soft);padding:18px;border-radius:16px;margin:18px 0}.input-row{display:flex;gap:10px;margin:10px 0}.input-row input{flex:1;min-width:0;border:1px solid var(--border);background:var(--surface);color:var(--text);padding:10px 12px;border-radius:10px}.input-lab pre{margin:10px 0 0;padding:13px;border-radius:10px;background:var(--code);color:#eaf1f9;white-space:pre-wrap}
.optional-note{display:block;border:1px solid var(--border);background:var(--surface2);border-radius:13px;padding:13px 15px;margin:15px 0}.optional-note summary{cursor:pointer;font-weight:800;color:var(--blue)}.optional-note[open] summary{margin-bottom:10px}
.recall-section{border-bottom:1px solid var(--border)}.recall-box{border-left:4px solid var(--green);background:color-mix(in srgb,var(--green) 8%,var(--surface));padding:16px 18px;border-radius:0 14px 14px 0}.recall-box p:last-child{margin-bottom:0}
.mini-code{margin:10px 0;padding:12px 14px;border-radius:10px;background:var(--code);color:#eaf1f9;overflow:auto;font:13.5px/1.55 ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono",monospace;white-space:pre-wrap}
.decision-tree,.diagnostic-tree{display:grid;gap:8px;justify-items:center;text-align:center;margin:18px 0}.decision-tree>div,.diagnostic-tree>div{border:1px solid var(--border);background:var(--surface2);border-radius:12px;padding:10px 14px;max-width:420px;width:100%}
.slice-visual{display:grid;grid-template-columns:repeat(13,auto);align-items:end;justify-content:start;gap:0;margin:20px 0;overflow:auto;padding-bottom:6px}.slice-visual span{font-size:.75rem;color:var(--blue);min-width:18px;text-align:center;border-left:2px solid var(--blue);padding-top:5px}.slice-visual b{font:700 1.15rem ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono",monospace;padding:6px 12px;background:var(--surface2);border-block:1px solid var(--border)}
.parsons{display:grid;gap:8px;margin:16px 0}.parsons>div{display:flex;justify-content:space-between;gap:14px;border:1px solid var(--border);border-radius:10px;padding:10px 12px;background:var(--surface2)}.parsons span{color:var(--muted);font-size:.9rem}
.scope-frames{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:18px 0}.scope-frames>div{border:2px solid var(--border);border-radius:15px;padding:16px;background:var(--surface)}.scope-frames code{display:block;margin:6px 0}
.contract-card{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.contract-card div{padding:10px;border-radius:10px;background:var(--surface2)}.contract-card span{display:block;color:var(--muted);font-size:.82rem}.contract-card strong{display:block;margin-top:4px}
.progression,.resource-cycle,.generator-timeline,.api-layers{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:18px 0}.resource-cycle,.generator-timeline{grid-template-columns:repeat(4,1fr)}.api-layers{grid-template-columns:repeat(4,1fr)}.progression>div,.resource-cycle>div,.generator-timeline>div,.api-layers>div{border:1px solid var(--border);border-radius:12px;padding:13px;background:var(--surface)}.progression span,.resource-cycle span,.generator-timeline span,.api-layers span{display:block;color:var(--muted);font-size:.88rem;margin-top:5px}
.mode-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:18px 0}.mode-cards>div{display:flex;flex-direction:column;gap:5px;border:1px solid var(--border);border-radius:12px;padding:14px;background:var(--surface)}.mode-cards code{font-size:1.25rem;font-weight:900}.mode-cards span{color:var(--muted)}
.path-map{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:start}.path-map ul{margin:0}.path-map>span{overflow-wrap:anywhere}
.file-pair{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:18px 0}.file-pair>div{border:1px solid var(--border);border-radius:14px;padding:14px;background:var(--surface)}
.type-diagnostic pre{margin:8px 0 0;padding:13px;background:var(--code);color:#eaf1f9;border-radius:10px;white-space:pre-wrap;overflow:auto}
.generator-timeline>div,.resource-cycle>div,.api-layers>div{position:relative}.generator-timeline strong,.resource-cycle strong,.api-layers strong{display:block;color:var(--blue)}
.regex-build{display:grid;grid-template-columns:1fr 1fr;gap:12px}.regex-build>div{border:1px solid var(--border);border-radius:10px;padding:12px;background:var(--surface2)}.regex-build code{font-size:1.15rem;font-weight:900}.regex-build span{display:block;margin-top:7px}.regex-build mark{padding:1px 3px;border-radius:3px}
.debug-steps{counter-reset:debug;padding:0;list-style:none}.debug-steps li{counter-increment:debug;border-left:3px solid var(--blue);padding:10px 0 10px 15px;margin:8px 0}.debug-steps li:before{content:counter(debug) ". ";font-weight:900;color:var(--blue)}
.choice-briefs{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:18px 0}.project-done{border-color:color-mix(in srgb,var(--green) 45%,var(--border));background:color-mix(in srgb,var(--green) 8%,var(--surface))}
.status{margin-top:10px;padding:10px 12px;border-radius:10px}.status.ok{background:color-mix(in srgb,var(--green) 9%,var(--surface))}.status.bad{background:color-mix(in srgb,var(--red) 8%,var(--surface))}
@media(max-width:760px){.activity-grid,.trace-strip,.scope-frames,.contract-card,.progression,.resource-cycle,.generator-timeline,.api-layers,.mode-cards,.file-pair,.regex-build,.choice-briefs,.path-map{grid-template-columns:1fr}.input-row{flex-direction:column}.parsons>div{display:block}.parsons span{display:block;margin-top:4px}}

/* Personalized learning activities v3 */
.learning-evidence{margin-top:14px;padding:12px 14px;border-left:4px solid var(--green);background:color-mix(in srgb,var(--green) 7%,var(--surface));border-radius:0 12px 12px 0}.learning-evidence p{margin:0}.activity-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:18px 0}.activity-card,.recall-box,.type-diagnostic,.concept-flow,.trace-box,.decision-box{border:1px solid var(--border);background:var(--surface);border-radius:14px;padding:16px}.activity-card h3{font-size:1.02rem;margin-bottom:8px}.activity-card p:last-child,.recall-box p:last-child{margin-bottom:0}.concept-flow{display:flex;align-items:center;justify-content:center;gap:12px;flex-wrap:wrap;margin:18px 0;font-weight:800}.concept-flow span{background:var(--blue-soft);padding:9px 12px;border-radius:10px}.recall-section{background:color-mix(in srgb,var(--yellow) 6%,var(--surface));margin-inline:-16px;padding-inline:16px!important;border-radius:16px}.recall-box{border-color:color-mix(in srgb,var(--yellow) 55%,var(--border))}.trace-table,.rubric-table{width:100%;border-collapse:collapse;margin:16px 0}.trace-table th,.trace-table td,.rubric-table th,.rubric-table td{border:1px solid var(--border);padding:9px 10px;text-align:left}.trace-table th,.rubric-table th{background:var(--surface2)}.choice-briefs{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:16px 0}.debug-steps{padding-left:1.3rem}.debug-steps li{margin:10px 0}.optional-note{border:1px dashed var(--border);padding:13px 15px;border-radius:12px;background:var(--surface2);margin:16px 0}.optional-note summary{cursor:pointer;font-weight:800}.type-diagnostic pre{white-space:pre-wrap;margin:8px 0 0}.practice-box+.practice-box{margin-top:14px}.input-lab{border:1px solid var(--border);background:var(--surface);border-radius:14px;padding:16px;margin:16px 0}.input-lab input{width:min(100%,320px);border:1px solid var(--border);background:var(--bg);color:var(--text);padding:10px 12px;border-radius:10px;margin-right:8px}.input-lab button{border:0;background:var(--blue);color:var(--bg);border-radius:9px;padding:10px 12px;font-weight:800}.input-lab pre{white-space:pre-wrap;background:var(--surface2);border-radius:10px;padding:12px;margin:12px 0 0}.relation-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:16px 0}
@media(max-width:760px){.activity-grid,.choice-briefs,.relation-grid{grid-template-columns:1fr}.concept-flow{justify-content:flex-start}}


/* SEO/quality pass: semantic navigation and trust components */
.term-card:target{outline:2px solid var(--accent,#3B82F6);outline-offset:4px}
.term-related{display:block;margin-top:.65rem}
.term-related a{font-weight:700}
.trace-table{overflow-x:auto;margin:1.2rem 0}.trace-table table{width:100%;border-collapse:collapse}.trace-table th,.trace-table td{padding:.85rem;border-bottom:1px solid var(--border);text-align:left;vertical-align:top}
.legal-note{padding:1.1rem 1.2rem;border:1px solid var(--border);border-left:4px solid #D9A51E;border-radius:12px;margin-bottom:2rem;background:var(--surface)}
.course-facts .card{height:100%}
.editor-toolbar>div{display:flex;gap:.45rem;align-items:center;flex-wrap:wrap}
.seo-related{margin-top:2rem;padding-top:1rem;border-top:1px solid var(--border)}
@media(max-width:720px){.editor-toolbar>div{width:100%}.editor-toolbar .btn,.editor-toolbar .run-btn{flex:1}}

/* =========================================================
   Design system polish v4 — 2026-09-30
   Contextual typography, spacing, responsive reading and UI.
   ========================================================= */
:root{
  --reading:72ch;
  --space-1:.25rem;--space-2:.5rem;--space-3:.75rem;--space-4:1rem;
  --space-5:1.5rem;--space-6:2rem;--space-7:3rem;--space-8:4rem;
  --radius-sm:10px;--radius-md:14px;--radius-lg:18px;
  --focus-ring:color-mix(in srgb,var(--focus) 72%,#fff 28%);
}

/* Base rhythm and accessibility */
body{font-family:ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.66}
:where(a,button,input,textarea,select,summary):focus-visible{outline:3px solid var(--focus-ring);outline-offset:3px}
.icon-btn,.menu-btn{min-width:44px;min-height:44px;padding:9px 12px}
.btn,.run-btn,.complete-btn{min-height:44px}
summary{min-height:44px}
pre{max-width:100%;overflow-x:auto;overscroll-behavior-inline:contain;tab-size:4}
.container{width:min(calc(100% - 40px),var(--container))}
.narrow{width:min(calc(100% - 40px),var(--reading))}
.section{padding:64px 0}

/* Contextual heading scale */
h1{font-size:clamp(2.15rem,4vw,3.2rem);line-height:1.08}
h2{font-size:clamp(1.55rem,2.5vw,2rem);line-height:1.18}
h3{font-size:1.2rem;line-height:1.25}
.page-home .hero h1{font-size:clamp(2.8rem,5.2vw,4.25rem);line-height:1.02;max-width:13ch}
.page-lesson .page-hero h1{font-size:clamp(2rem,3vw,2.7rem)}
.page-error-detail .page-hero h1{font-size:clamp(1.95rem,3.2vw,2.75rem);max-width:22ch}
:where(.card,.route-card,.tool-card,.error-card,.challenge) h2{font-size:1.38rem;line-height:1.25;margin-bottom:12px}
:where(.card,.route-card,.tool-card,.error-card,.challenge) h3{font-size:1.1rem}
.page-course .module h2{font-size:clamp(1.45rem,2vw,1.7rem);margin-bottom:0}

/* Page heroes and readable prose */
.page-hero{padding:48px 0 32px}
.page-lesson .page-hero{padding:38px 0 26px}
.page-404 .page-hero{padding:38px 0 26px}
.lead{max-width:65ch}
.prose{max-width:72ch}
.prose>h2:not(:first-child){margin-top:2.75rem}
.prose>h3:not(:first-child){margin-top:2rem}
.prose>p+p{margin-top:.9rem}
.prose>ul,.prose>ol{padding-left:1.4rem}
.prose>:where(.grid-2,.grid-3,.table-scroll,.code-block,.callout,.legal-note,.actions,.related-links)+h2{margin-top:2.75rem}

/* Main cards and section composition */
.grid-2,.grid-3,.grid-4{gap:20px}
.card,.route-card,.lesson-card,.tool-card,.error-card{padding:24px;border-radius:var(--radius-lg)}
.card p:last-child,.route-card p:last-child,.tool-card p:last-child,.error-card p:last-child{margin-bottom:0}
.section-head{gap:36px;margin-bottom:32px}
.route-card{display:flex;flex-direction:column;align-items:flex-start;gap:10px}
.route-card .route-action{margin-top:auto}
.error-card{display:flex;flex-direction:column;gap:6px}
.error-card strong{font-size:1.06rem;line-height:1.3}
.error-card span{color:var(--muted);line-height:1.5}
.feature{padding:24px 0}

/* Home */
.page-home .hero{padding:78px 0 62px}
.page-home .hero-grid{gap:56px}
.page-home .actions{margin-top:28px}
.page-home .stats{gap:12px;margin-top:32px}
.page-home .stat{padding:16px}

/* Course overview */
.page-course .course-facts{gap:16px}
.page-course .course-facts .card{padding:20px}
.page-course .module{margin:44px 0}
.page-course .module-head{margin-bottom:16px}
.page-course .lesson-list{gap:14px}
.page-course .lesson-card{padding:18px}
.page-course .progress-row{gap:16px;align-items:center}

/* Lessons: comfortable desktop, compact navigation on mobile */
.course-shell{grid-template-columns:260px minmax(0,1fr);gap:48px;padding:36px 0 72px}
.course-sidebar{top:88px;max-height:calc(100vh - 108px);overflow-y:auto;scrollbar-gutter:stable;padding-right:6px}
.course-sidebar a{padding:8px 10px;line-height:1.4}
.lesson-content{max-width:74ch}
.lesson-content>section{padding:32px 0}
.lesson-content>section>h2{font-size:clamp(1.5rem,2.25vw,1.9rem)}
.lesson-content>section>h3{margin-top:28px}
.lesson-nav{margin-top:32px}
.lesson-nav a{padding:14px 16px}
.course-index-mobile{display:none}

/* Educational components: reduce box density and standardize spacing */
.learning-evidence{margin-top:18px;padding:14px 16px}
.activity-grid{gap:16px;margin:22px 0}
.activity-card,.recall-box,.type-diagnostic,.concept-flow,.trace-box,.decision-box{padding:18px;border-radius:var(--radius-md)}
.concept-flow{gap:10px;margin:20px 0}
.concept-flow span{padding:8px 11px}
.practice-box{padding:22px;border-radius:var(--radius-lg)}
.practice-box+.practice-box{margin-top:24px}
.optional-note{padding:15px 17px;margin:20px 0}
.recall-section{margin-inline:-12px;padding-inline:12px!important}
.scope-frames,.file-pair,.path-map,.regex-build,.choice-briefs{gap:18px}
.contract-card,.mode-cards,.progression,.resource-cycle,.generator-timeline,.api-layers{gap:14px}
.parsons{gap:10px;margin:20px 0}
.parsons>div{padding:12px 14px}
.debug-steps{padding-left:0}
.debug-steps li{padding:12px 0 12px 18px;margin:10px 0}

/* Input/terminal/code components */
.input-lab{padding:20px;margin:20px 0;background:var(--blue-soft);border-color:color-mix(in srgb,var(--blue) 45%,var(--border));border-radius:var(--radius-lg)}
.input-row{gap:12px;margin:12px 0}
.input-row input,.input-lab input{min-height:44px;padding:10px 12px}
.input-lab button{min-height:44px;padding:10px 14px}
.input-lab pre{margin:12px 0 0;padding:15px 16px;border-radius:var(--radius-md);background:var(--code);color:#eaf1f9;white-space:pre-wrap}
.terminal-block{margin:18px 0;padding:16px 18px;border:1px solid color-mix(in srgb,var(--blue) 22%,var(--border));border-radius:var(--radius-md);background:var(--code);color:#eaf1f9;white-space:pre;overflow-x:auto;font:14.5px/1.62 ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono",monospace}
.code-block{margin:20px 0;border-radius:var(--radius-md)}
.code-block pre{padding:18px 20px;line-height:1.62}

/* Tables: one responsibility per component */
.table-scroll{width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch;overscroll-behavior-inline:contain;margin:20px 0;border:1px solid var(--border);border-radius:var(--radius-md);background:var(--surface)}
.table-scroll .data-table{width:100%;min-width:520px;border-collapse:collapse;margin:0;border:0;border-radius:0;overflow:visible}
.table-scroll .data-table th,.table-scroll .data-table td{padding:11px 13px;border:0;border-bottom:1px solid var(--border);text-align:left;vertical-align:top}
.table-scroll .data-table th{background:var(--surface2);font-size:.92rem;line-height:1.35}
.table-scroll .data-table tr:last-child td{border-bottom:0}
.table-scroll .rubric-table{min-width:640px}

/* Editor sizing by context */
.editor{border-radius:var(--radius-md)}
.editor-toolbar{padding:11px 13px;min-height:48px}
.editor-toolbar>span{font-size:.88rem;color:var(--muted);font-weight:700}
.editor textarea{min-height:170px;padding:16px 18px;line-height:1.58}
.output{min-height:64px;padding:13px 18px}
.page-editor .editor{max-width:920px;margin-inline:auto}
.page-editor .editor textarea{min-height:310px}
.page-editor .output{min-height:104px}
.page-practice .challenge{margin:0 0 38px;padding:24px}
.page-practice .challenge .editor textarea{min-height:150px}
.page-practice .challenge .output{min-height:58px}
.page-practice .challenge .hint{margin-top:14px}
.page-practice .transfer-box{margin-top:18px}

/* Glossary */
.page-glossary .search{min-height:46px;padding:12px 14px}
.page-glossary .glossary-grid{gap:20px;margin-top:24px}
.page-glossary .term-card{padding:20px;border-radius:var(--radius-md)}
.page-glossary .term-card dt{font-size:1.08rem;line-height:1.3}
.page-glossary .term-card dd{margin-top:8px;line-height:1.58}
.page-glossary .term-related{padding-top:12px;margin-top:12px;border-top:1px solid var(--border)}

/* FAQ */
.page-faq details{padding:16px 18px;border-radius:var(--radius-md)}
.page-faq details+details{margin-top:12px}
.page-faq summary{display:flex;align-items:center;font-weight:800;line-height:1.35}
.page-faq details[open] summary{margin-bottom:12px}

/* Error pages */
.page-errors-hub .grid-3{gap:18px}
.page-errors-hub .error-card{padding:20px}
.page-error-detail .related-links{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px;padding-top:20px;border-top:1px solid var(--border)}
.page-error-detail .related-links a{display:inline-flex;align-items:center;min-height:40px;padding:7px 10px;border:1px solid var(--border);border-radius:10px;text-decoration:none}

/* Legal/trust pages */
.page-prose .legal-note{padding:18px 20px;margin-bottom:32px}
.page-prose .grid-2{gap:20px}
.page-prose .actions{margin-top:28px}

/* Footer */
.footer{padding:48px 0 22px}
.footer-grid{gap:38px}
.footer a{margin:7px 0;line-height:1.45}
.footer-bottom{margin-top:32px;padding-top:20px}

/* Utilities replacing inline spacing */
.mt-5{margin-top:20px!important}.mt-7{margin-top:28px!important}.mt-8{margin-top:32px!important}.mt-9{margin-top:36px!important}.mt-10{margin-top:40px!important}

@media(max-width:960px){
  .section-head{align-items:flex-start}
  .page-home .hero-grid{gap:38px}
  .course-shell{grid-template-columns:230px minmax(0,1fr);gap:30px}
  .generator-timeline,.resource-cycle,.api-layers{grid-template-columns:repeat(2,1fr)}
}

@media(max-width:900px){
  .course-shell{display:block;padding-top:20px}
  .course-sidebar{display:none}
  .course-index-mobile{display:block;margin:0 0 26px;border:1px solid var(--border);border-radius:var(--radius-md);background:var(--surface);overflow:hidden}
  .course-index-mobile summary{display:flex;align-items:center;padding:13px 16px;font-weight:800;cursor:pointer;background:var(--surface2)}
  .course-index-panel{max-height:min(62vh,620px);overflow:auto;padding:8px}
  .course-index-panel nav{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px}
  .course-index-panel a{display:block;padding:9px 10px;border-radius:9px;text-decoration:none;color:var(--muted);font-size:.9rem;line-height:1.35}
  .course-index-panel a.current{background:var(--blue-soft);color:var(--text);font-weight:800}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .glossary-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media(max-width:760px){
  .container,.narrow{width:min(calc(100% - 32px),var(--container))}
  .narrow{max-width:var(--reading)}
  .section{padding:52px 0}
  .page-hero{padding:38px 0 26px}
  .page-lesson .page-hero{padding:32px 0 22px}
  .section-head{display:block;margin-bottom:26px}
  .section-head p{margin-top:10px;max-width:65ch}
  .grid-2{grid-template-columns:1fr}
  .split{gap:26px}
  .page-home .hero{padding:58px 0 48px}
  .page-home .hero h1{font-size:clamp(2.45rem,11vw,3.55rem)}
  .page-home .stats{grid-template-columns:repeat(2,1fr)}
  .lesson-content>section{padding:28px 0}
  .lesson-nav{flex-direction:column}
  .lesson-nav a{max-width:none;width:100%}
  .course-index-panel nav{grid-template-columns:1fr}
  .activity-grid,.contract-card,.mode-cards,.progression,.generator-timeline,.resource-cycle,.api-layers,.scope-frames,.file-pair,.regex-build,.choice-briefs,.path-map,.relation-grid{grid-template-columns:1fr}
  .input-row{flex-direction:column}
  .editor-toolbar{flex-direction:column;align-items:stretch}
  .editor-toolbar>div{width:100%}
  .editor-toolbar .btn,.editor-toolbar .run-btn{flex:1;min-width:0}
  .page-glossary .glossary-grid{grid-template-columns:1fr}
  .page-course .progress-row{flex-direction:column;align-items:stretch}
  .page-course .progress-row .btn{width:100%}
  .footer-bottom{flex-direction:column}
}

@media(max-width:600px){
  .container,.narrow{width:min(calc(100% - 32px),var(--container))}
  .card,.route-card,.lesson-card,.tool-card,.error-card{padding:20px}
  .page-practice .challenge{padding:20px;margin-bottom:32px}
  .page-home .hero{padding:48px 0 42px}
  .page-home .stats{grid-template-columns:1fr 1fr;gap:8px}
  .lesson-list{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .table-scroll .data-table{min-width:480px}
  .slice-visual{padding-bottom:10px}
}

/* v4 final micro-polish */
.site-header{-webkit-backdrop-filter:blur(14px)}
.jump-links a{min-height:40px;align-items:center}
.input-row input{width:auto;margin-right:0}
@media(max-width:600px){.jump-links{flex-wrap:nowrap;overflow-x:auto;overscroll-behavior-inline:contain;padding-bottom:6px;scrollbar-width:thin}.jump-links a{flex:0 0 auto;white-space:nowrap}.privacy-grid{padding:15px}}


/* =========================================================
   Dark-only layout refinements v5 — 2026-09-30
   ========================================================= */
:root{color-scheme:dark}

/* Progress needs a clear pause after the final learning note. */
.lesson-content .complete-btn{margin-top:28px}
.lesson-content .complete-btn + .lesson-nav{margin-top:36px}

/* Error cards are cards first, links second: remove hyperlink noise. */
.page-errors-hub .error-card{color:var(--text);text-decoration:none;transition:border-color .16s ease,background .16s ease,transform .16s ease}
.page-errors-hub .error-card strong,.page-errors-hub .error-card span{text-decoration:none}
.page-errors-hub .error-card strong{color:var(--blue)}
.page-errors-hub .error-card:hover{color:var(--text);border-color:color-mix(in srgb,var(--blue) 68%,var(--border));background:color-mix(in srgb,var(--surface2) 72%,var(--surface));transform:translateY(-2px)}
.page-errors-hub .error-card:hover strong{color:var(--blue2)}

/* Keep dense catalogue pages controlled on wide screens. */
.page-errors-hub .section>.container{max-width:1100px}
.page-glossary .section>.container{max-width:1160px}

/* The glossary search/result grid is the navigation; the redundant chip cloud is removed. */
.page-glossary .callout{margin-top:36px}

/* Dark-only controls: no theme-switch affordance is reserved in desktop navigation. */
.nav-actions{margin-left:0}

@media(max-width:760px){
  .lesson-content .complete-btn{margin-top:24px}
  .lesson-content .complete-btn + .lesson-nav{margin-top:30px}
}

/* pre-launch SEO/internal-link polish */
.related-error-note{margin:22px 0 0;padding:13px 15px;border-left:3px solid var(--blue);background:color-mix(in srgb,var(--blue) 7%,var(--surface));border-radius:0 12px 12px 0;color:var(--muted)}
.related-error-note strong{color:var(--text)}
.related-links-label{display:inline-flex;align-items:center;min-height:40px;color:var(--muted);font-size:.9rem;font-weight:800;padding-right:2px}

/* =========================================================
   UX, typography and mobile refinement v6 — 2026-09-30
   ========================================================= */
.lesson-content,.prose{font-size:1.04rem}
.search,.input-row input,.input-lab input,select{border-color:var(--border-strong)}
.btn-secondary,.menu-btn,.icon-btn{border-color:color-mix(in srgb,var(--border-strong) 68%,var(--border))}
.btn-primary,.run-btn,.input-lab button,.complete-btn.done{font-weight:800}
.btn-primary:active,.btn-secondary:active,.run-btn:active,.complete-btn:active,.menu-btn:active{transform:translateY(1px)}
.btn:disabled,.run-btn:disabled,button:disabled{opacity:.72}
.complete-btn.done:hover{background:color-mix(in srgb,var(--green) 88%,#fff 12%);color:var(--bg)}
.editor textarea{font-size:15px}
.output{font-size:14px}
.code-block pre{font-size:15px}

.engine-status{display:none;align-items:flex-start;gap:9px;padding:9px 14px;border-top:1px solid var(--border);background:color-mix(in srgb,var(--surface2) 76%,var(--code));color:var(--muted);font-size:.88rem;line-height:1.45}
.engine-status:not(:empty){display:flex}
.engine-status.is-loading::before{content:"";flex:0 0 14px;width:14px;height:14px;margin-top:2px;border:2px solid color-mix(in srgb,var(--blue) 30%,var(--border));border-top-color:var(--blue);border-radius:50%;animation:pdc-spin .75s linear infinite}
.engine-status.is-ready{color:color-mix(in srgb,var(--green) 82%,var(--text))}
.engine-status.is-error{color:var(--red)}
@keyframes pdc-spin{to{transform:rotate(360deg)}}

.progress-save-note{min-height:1.45em;margin:9px 2px 0;color:var(--muted);font-size:.9rem;line-height:1.45}
.progress-save-note.is-error{color:var(--red)}

.lesson-nav a{display:flex;flex-direction:column;justify-content:center;gap:4px;min-height:66px}
.lesson-nav a:last-child{align-items:flex-end;text-align:right}
.lesson-nav-kicker{color:var(--muted);font-size:.76rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em}
.lesson-nav-title{font-weight:600;line-height:1.35}

.page-errors-hub .error-card::after{content:"Ver guía →";margin-top:7px;color:var(--muted);font-size:.86rem;font-weight:700}
.page-errors-hub .error-card:hover::after{color:var(--blue2)}

.practice-jump-shell{border-bottom:1px solid var(--border);background:var(--bg)}
.practice-jump-shell .jump-links{margin:0;padding:12px 0}
.practice-group-next{display:flex;justify-content:flex-end;margin:-14px 0 34px}
.practice-group-next a{display:inline-flex;align-items:center;min-height:44px;padding:8px 12px;border:1px solid var(--border);border-radius:10px;text-decoration:none;color:var(--muted);font-weight:700}
.practice-group-next a:hover{border-color:var(--blue);color:var(--text)}

@media(max-width:900px){
  body.nav-open{overflow:hidden}
  .nav-links a{display:flex;align-items:center;min-height:44px;padding:10px 12px}
  .course-index-mobile summary{min-height:48px}
}

@media(max-width:760px){
  .jump-links a,.page-error-detail .related-links a{min-height:44px}
  .practice-jump-shell{position:sticky;top:66px;z-index:39;background:color-mix(in srgb,var(--bg) 96%,transparent);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}
  .practice-jump-shell .container{width:100%}
  .practice-jump-shell .jump-links{padding:9px 16px;flex-wrap:nowrap;overflow-x:auto;overscroll-behavior-inline:contain;scrollbar-width:none}
  .practice-jump-shell .jump-links::-webkit-scrollbar{display:none}
  .practice-jump-shell .jump-links a{flex:0 0 auto;white-space:nowrap}
  .lesson-nav a{min-height:72px}
  .lesson-content,.prose{font-size:1.02rem}
  .breadcrumbs{font-size:.88rem}
  .pill{font-size:.84rem}
  .footer-grid{gap:28px}
}

@media(max-width:420px){
  .page-home .hero h1{font-size:2.25rem;line-height:1.06}
  .eyebrow{font-size:.8rem}
}

@media(prefers-reduced-motion:reduce){
  .engine-status.is-loading::before{animation-duration:1.5s}
  .btn-primary:active,.btn-secondary:active,.run-btn:active,.complete-btn:active,.menu-btn:active{transform:none}
}



/* =========================================================
   Mobile polish hotfixes v6.1 — 2026-09-30
   ========================================================= */
.site-header .brand{white-space:nowrap}
.site-header .brand>span:last-child{display:inline-flex;align-items:baseline;white-space:nowrap}
.hero-grid>*,.split>*,.grid-2>*,.grid-3>*,.grid-4>*,.course-shell>*,.section-head>*{min-width:0}
.trace-box{max-width:100%;overflow-x:auto;overflow-y:hidden}
.trace-box pre{margin:0;max-width:100%;white-space:pre-wrap;overflow-wrap:anywhere}
.page-error-detail .related-links{align-items:flex-start}
.page-error-detail .related-links-label{display:block;flex-basis:100%;padding-top:6px;margin-top:4px}
.page-error-detail .related-links a{max-width:100%;white-space:normal}

@media(max-width:600px){
  .site-header .nav{gap:12px;justify-content:space-between}
  .site-header .brand{gap:8px;font-size:1rem;flex:0 1 auto;min-width:0}
  .site-header .brand-mark{width:36px;height:36px;border-radius:11px}
  .site-header .brand-soft{display:inline}
  .site-header .menu-btn{min-height:44px;padding:8px 14px;flex:0 0 auto}
  .page-error-detail .related-links{display:flex;flex-direction:column;gap:10px;align-items:stretch}
  .page-error-detail .related-links a{display:flex;align-items:center;width:100%;padding:11px 12px;border-radius:12px}
  .page-error-detail .related-links-label{min-height:auto;padding:4px 2px 0;margin-top:2px}
}

@media(max-width:420px){
  .site-header .brand{font-size:.96rem}
  .site-header .brand-mark{width:34px;height:34px}
}

/* Runtime safety feedback */
.run-btn.is-running{background:var(--red);color:var(--bg)}
.run-btn.is-running:hover{background:color-mix(in srgb,var(--red) 88%,#fff 12%);color:var(--bg)}


/* Brand identity refresh v8 — open-book + terminal prompt mark */
.brand-mark{display:block;width:40px;height:40px;border-radius:0;background:none;box-shadow:none;object-fit:contain;flex:0 0 auto}
.brand-wordmark{display:inline-flex;align-items:baseline;white-space:nowrap}
.brand-soft{font-weight:700;color:var(--blue2)}
.footer .brand-soft{color:var(--blue2)}
@media(max-width:600px){.site-header .brand-mark{width:36px;height:36px}.site-header .brand{font-size:1rem;gap:8px}}
@media(max-width:420px){.site-header .brand-mark{width:34px;height:34px}.site-header .brand{font-size:.94rem}}


/* =========================================================
   PythonDesdeCero brand palette v3 — 2026-09-30
   ========================================================= */
:root{
  --bg:#0B1220;
  --bg2:#101A2B;
  --surface:#152238;
  --surface2:#1C2E49;
  --text:#F3F7FC;
  --muted:#A7B4C7;
  --border:#29415F;
  --border-strong:#4E6B91;
  --blue:#3B82F6;
  --blue2:#60A5FA;
  --blue-soft:#122B50;
  --yellow:#F9C74F;
  --green:#48C78E;
  --red:#FF6B7A;
  --code:#07101C;
  --code2:#0D192A;
  --focus:#F9C74F;
  --shadow:0 20px 64px rgba(0,0,0,.28);
}
.brand-wordmark{font-weight:800;color:var(--text)}
.brand-wordmark .brand-soft{font-weight:700;color:var(--blue2)}
.site-header{border-bottom-color:color-mix(in srgb,var(--blue) 16%,var(--border))}
.nav-links a:hover,.nav-links a[aria-current=page]{background:color-mix(in srgb,var(--blue) 10%,var(--surface2));color:var(--text)}
.page-hero{background:linear-gradient(180deg,color-mix(in srgb,var(--surface) 54%,var(--bg)),var(--bg))}
.card,.route-card,.lesson-card,.tool-card,.error-card,.editor,.term-card{box-shadow:0 1px 0 rgba(255,255,255,.015)}
.route-card-primary{background:linear-gradient(135deg,color-mix(in srgb,var(--blue) 14%,var(--surface)),var(--surface))}
.btn-primary,.run-btn,.input-lab button{box-shadow:0 7px 20px color-mix(in srgb,var(--blue) 18%,transparent)}
.btn-primary:hover,.run-btn:hover,.input-lab button:hover{box-shadow:0 8px 24px color-mix(in srgb,var(--blue) 24%,transparent)}
.progress-bar{background:linear-gradient(90deg,var(--blue),var(--yellow))}
:where(a,button,input,textarea,select,summary):focus-visible{outline-color:var(--focus)}


/* Practice page learning experience v7 */
.practice-progress-card{margin-top:22px;padding:20px 22px;border:1px solid color-mix(in srgb,var(--blue) 42%,var(--border));border-radius:var(--radius);background:linear-gradient(135deg,color-mix(in srgb,var(--blue) 10%,var(--surface)),var(--surface))}
.practice-progress-head{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:12px}
.practice-progress-head strong{display:block;font-size:1.08rem}
.practice-progress-card p{margin:11px 0 0;color:var(--muted);font-size:.92rem}
.practice-reset{min-height:42px;padding:8px 12px;border:1px solid var(--border-strong);border-radius:10px;background:var(--surface2);color:var(--text);font-weight:700}
.practice-reset:hover{border-color:var(--blue)}
.exercise-heading-row{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:4px}
.exercise-heading-row .eyebrow{margin:0}
.exercise-solved-badge{display:inline-flex;align-items:center;min-height:30px;padding:4px 9px;border:1px solid color-mix(in srgb,var(--green) 45%,var(--border));border-radius:999px;background:color-mix(in srgb,var(--green) 10%,var(--surface));color:var(--green);font-size:.78rem;font-weight:800}
.exercise-solved-badge[hidden]{display:none}
.page-practice .challenge.is-solved{border-color:color-mix(in srgb,var(--green) 46%,var(--border));background:linear-gradient(180deg,color-mix(in srgb,var(--green) 4%,var(--surface)),var(--surface))}
.page-practice .status{min-height:1.5em;margin:12px 2px 0;line-height:1.5}
.page-practice details.hint{background:var(--surface2)}
.page-practice details.hint summary{color:var(--blue)}
.page-practice .hint-level-2{border-style:dashed}
.solution-nudge{margin:12px 0 0;padding:10px 12px;border-left:3px solid var(--yellow);background:color-mix(in srgb,var(--yellow) 7%,var(--surface));border-radius:0 10px 10px 0;color:var(--muted);font-size:.92rem}
.solution-nudge[hidden]{display:none}
.exercise-solution{margin:14px 0 0;border:1px solid color-mix(in srgb,var(--yellow) 38%,var(--border));border-radius:13px;background:color-mix(in srgb,var(--yellow) 5%,var(--surface));overflow:hidden}
.exercise-solution>summary{cursor:pointer;padding:13px 15px;font-weight:800;color:var(--yellow)}
.exercise-solution[open]>summary{border-bottom:1px solid var(--border)}
.solution-content{padding:16px}
.solution-content pre{margin:10px 0 18px;padding:15px 16px;border:1px solid var(--border);border-radius:11px;background:var(--code);color:#eaf1f9;overflow-x:auto;font:15px/1.62 ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono",monospace}
.solution-content h3{margin:18px 0 7px;font-size:1.02rem}
.solution-content p:last-child{margin-bottom:0}
.practice-editorial-guide{margin:58px 0 36px;padding-top:40px;border-top:1px solid var(--border)}
.practice-editorial-guide>h2{font-size:clamp(1.55rem,2.4vw,1.95rem)}
.practice-editorial-guide .card{padding:18px}
.practice-editorial-guide .card p{margin-bottom:0}
@media(max-width:760px){
  .practice-progress-head{align-items:flex-start;flex-direction:column}
  .practice-reset{width:100%}
  .exercise-heading-row{align-items:flex-start}
  .solution-content{padding:14px}
  .solution-content pre{font-size:14px}
  .practice-editorial-guide{margin-top:46px;padding-top:32px}
}


/* =========================================================
   Course index + brand integrity refinement v8 — 2026-09-30
   ========================================================= */
/* Keep the complete wordmark visible everywhere, including the mobile footer. */
.brand .brand-soft{display:inline}
.brand-mark{aspect-ratio:1/1}
.site-header .brand-wordmark,.footer .brand-wordmark{line-height:1;white-space:nowrap}

/* Give module navigation and course progress distinct visual zones. */
.page-course #modulos{margin:0 0 28px}
.page-course .course-progress-card{padding:26px 28px}
.page-course .course-progress-card h2{font-size:clamp(1.45rem,2vw,1.75rem);margin-bottom:18px}
.page-course .course-progress-card .progress-wrap{height:11px;background:color-mix(in srgb,var(--surface2) 78%,var(--bg));border:1px solid color-mix(in srgb,var(--border) 78%,transparent)}
.page-course .course-progress-card .progress-bar{background:linear-gradient(90deg,var(--blue),var(--blue2));min-width:0}
.page-course .course-progress-card .progress-row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:24px;align-items:center;margin-top:18px;color:var(--muted);font-size:1rem}
.page-course .course-progress-card .progress-row span{min-width:0}
.page-course .course-progress-card .btn{min-height:44px;padding:8px 17px;white-space:nowrap}

@media(max-width:760px){
  .page-course #modulos{margin-bottom:22px}
  .page-course .course-progress-card{padding:22px 20px}
  .page-course .course-progress-card .progress-row{grid-template-columns:1fr;gap:14px;align-items:stretch}
  .page-course .course-progress-card .btn{width:100%}
}