:root{
  --ink:#14213d;--muted:#61708a;--line:#dce4ef;--soft:#f4f7fb;--panel:#fff;
  --primary:#5b3df5;--primary-dark:#4026ce;--accent:#14b8a6;--danger:#c2414b;
  --success:#16845b;--shadow:0 18px 50px rgba(20,33,61,.10);--radius:20px
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:#fff;line-height:1.55}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
img{max-width:100%;display:block}
.container{width:min(1160px,calc(100% - 40px));margin-inline:auto}
.narrow{width:min(760px,calc(100% - 40px))}
.narrow-wide{width:min(980px,calc(100% - 40px))}
.center{text-align:center}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.92);backdrop-filter:blur(14px);border-bottom:1px solid rgba(220,228,239,.8)}
.nav-wrap{min-height:76px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:inline-flex;align-items:center;gap:11px;font-size:17px}
.brand img{height:44px;width:auto}
.brand span:last-child{display:grid;line-height:1.05}
.brand small{font-size:11px;color:var(--muted);letter-spacing:.12em;text-transform:uppercase;margin-top:4px}
.brand-mark{width:42px;height:42px;border-radius:13px;display:grid;place-items:center;color:#fff;font-weight:900;font-size:22px;background:linear-gradient(145deg,var(--primary),#8b5cf6);box-shadow:0 8px 22px rgba(91,61,245,.28)}
.main-nav{display:flex;gap:26px;align-items:center}
.main-nav a{font-weight:650;color:#3c4b65}
.main-nav a:hover,.text-link:hover{color:var(--primary)}
.hero{padding:88px 0 72px;background:radial-gradient(circle at 85% 15%,rgba(91,61,245,.15),transparent 28%),linear-gradient(180deg,#fbfcff,#fff)}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:70px;align-items:center}
.eyebrow{font-size:12px;font-weight:850;color:var(--primary);text-transform:uppercase;letter-spacing:.15em;margin-bottom:10px}
h1,h2,h3,p{margin-top:0}
h1{font-size:clamp(2.3rem,5vw,4.8rem);line-height:1.02;letter-spacing:-.045em;margin-bottom:22px}
h2{font-size:clamp(1.5rem,3vw,2.3rem);line-height:1.12;letter-spacing:-.025em}
h3{line-height:1.25}
.hero-subtitle{font-size:1.3rem;font-weight:650;color:#3c4b65;margin-bottom:10px}
.hero p{max-width:670px;color:var(--muted);font-size:1.05rem}
.button-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.center-row{justify-content:center}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:11px 20px;border-radius:12px;border:1px solid transparent;font-weight:800;transition:.18s ease}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 10px 24px rgba(91,61,245,.24)}
.btn-primary:hover{background:var(--primary-dark)}
.btn-secondary{background:#fff;border-color:var(--line);color:var(--ink)}
.btn-ghost{background:transparent;border-color:rgba(255,255,255,.18);color:inherit}
.btn-large{min-height:54px;padding-inline:30px}
.full{width:100%}
.hero-points{display:flex;flex-wrap:wrap;gap:12px 22px;margin-top:28px;color:#45546d;font-size:.92rem;font-weight:650}
.hero-card{padding:30px;border:1px solid rgba(91,61,245,.15);border-radius:28px;background:rgba(255,255,255,.9);box-shadow:var(--shadow);transform:rotate(1deg)}
.hero-card h3{font-size:1.55rem;margin:24px 0 12px}
.hero-card p{font-size:.96rem}
.mini-header,.progress-label,.score-line{display:flex;justify-content:space-between;align-items:center;gap:12px}
.mini-header{font-size:.84rem;color:var(--muted);font-weight:700}
.progress{height:9px;background:#e8eaf5;border-radius:999px;overflow:hidden;margin:12px 0}
.progress span{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--primary),#8b5cf6)}
.stat-grid,.result-stats{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:22px}
.stat-grid div,.result-stats div{padding:18px;border-radius:15px;background:var(--soft);display:grid;gap:3px}
.stat-grid strong{font-size:1.65rem}
.stat-grid small,.result-stats span{color:var(--muted)}
.section{padding:76px 0}
.section.soft{background:var(--soft)}
.section-heading{display:flex;justify-content:space-between;align-items:end;gap:24px;margin-bottom:32px}
.section-heading h2{margin-bottom:4px}
.section-heading p{color:var(--muted);margin-bottom:0}
.text-link{color:var(--primary);font-weight:800}
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.course-card{padding:26px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;transition:.2s ease;min-height:245px;display:flex;flex-direction:column}
.course-card:hover{transform:translateY(-4px);border-color:rgba(91,61,245,.4);box-shadow:var(--shadow)}
.course-icon{font-size:2rem;margin-bottom:20px}
.course-card h2,.course-card h3{margin-bottom:9px}
.course-card p{color:var(--muted);flex:1}
.card-meta{display:flex;justify-content:space-between;gap:12px;padding-top:16px;border-top:1px solid var(--line);font-size:.83rem;font-weight:750;color:#64748b}
.steps-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.steps-grid article{padding:24px;border-radius:18px;background:#fff;border:1px solid var(--line)}
.steps-grid article>span{width:38px;height:38px;border-radius:11px;display:grid;place-items:center;background:#eeeafe;color:var(--primary);font-weight:900;margin-bottom:18px}
.steps-grid p{color:var(--muted);margin-bottom:0}
.site-footer{padding:44px 0;background:#10172b;color:#d9e1ef}
.footer-grid{display:flex;justify-content:space-between;gap:30px}
.site-footer p{color:#94a3b8;margin:6px 0 0}
.page-hero{background:linear-gradient(145deg,#f4f2ff,#f8fbff);border-bottom:1px solid var(--line)}
.page-hero.compact{padding:60px 0}
.page-hero h1{font-size:clamp(2.2rem,4vw,3.7rem);margin:10px 0 14px}
.page-hero p{color:var(--muted);font-size:1.06rem;max-width:760px;margin-bottom:0}
.list-grid{display:grid;gap:13px}
.topic-card{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:20px;padding:20px 22px;border:1px solid var(--line);border-radius:17px;transition:.18s;background:#fff}
.topic-card:hover{border-color:rgba(91,61,245,.4);box-shadow:0 12px 30px rgba(20,33,61,.08)}
.topic-number{font-weight:900;color:#8c99ac;font-size:.86rem}
.topic-card h3{margin-bottom:4px}
.topic-card p{color:var(--muted);margin-bottom:0}
.topic-side{display:grid;text-align:center}
.topic-side strong{font-size:1.35rem}
.topic-side small{color:var(--muted);font-size:.72rem}
.topic-side span{color:var(--primary);font-size:1.3rem}
.level-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.level-card{padding:23px;border:1px solid var(--line);border-radius:18px;background:#fff}
.level-card.disabled{opacity:.58;background:var(--soft)}
.level-code,.badge{display:inline-flex;padding:5px 9px;border-radius:999px;background:#eeeafe;color:var(--primary);font-size:.72rem;font-weight:850;text-transform:uppercase;letter-spacing:.05em}
.level-card h3{margin:12px 0 6px}
.level-card p{color:var(--muted)}
.inline-field{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:12px;font-size:.85rem;font-weight:750}
.inline-field select{width:auto;padding:8px 32px 8px 10px}
.badge.muted{background:#edf1f6;color:#607087}
.empty-state{padding:36px;text-align:center;border:1px dashed #cbd5e1;border-radius:16px;color:var(--muted);background:#fafcff}
.flash{margin-top:16px;padding:13px 16px;border-radius:12px;font-weight:700}
.flash.success{background:#e8f8f1;color:#116844;border:1px solid #bfe8d4}
.flash.error{background:#fff0f1;color:#98343d;border:1px solid #f1c3c7}
.practice-shell{min-height:calc(100vh - 76px);background:#f5f7fc;padding:34px 0 70px}
.practice-container{width:min(930px,calc(100% - 34px))}
.practice-header{display:flex;justify-content:space-between;gap:24px;align-items:end;margin-bottom:22px}
.practice-header h1{font-size:2.2rem;margin:5px 0 0}
.elapsed-box{min-width:190px;display:grid;text-align:right}
.elapsed-box small,.elapsed-box span{color:var(--muted);font-size:.75rem}
.elapsed-box strong{font-variant-numeric:tabular-nums;font-size:1.75rem}
.practice-progress,.question-card,.feedback{background:#fff;border:1px solid var(--line);border-radius:20px;padding:22px;box-shadow:0 8px 25px rgba(20,33,61,.05)}
.practice-progress{margin-bottom:18px}
.practice-progress small{color:var(--muted)}
.feedback{display:flex;gap:16px;margin-bottom:18px}
.feedback.correct{border-color:#bce6d3;background:#f5fffa}
.feedback.incorrect{border-color:#f3c7cb;background:#fffafb}
.feedback-icon{flex:none;width:42px;height:42px;border-radius:50%;display:grid;place-items:center;background:var(--ink);color:#fff;font-weight:900}
.feedback h2{font-size:1.15rem;margin-bottom:6px}
.feedback p{margin-bottom:5px}
.question-card{padding:30px}
.question-top{display:flex;justify-content:space-between;color:var(--muted);font-size:.79rem;font-weight:750;margin-bottom:22px}
.question-card>h2{font-size:1.45rem;line-height:1.45}
.options-list{border:0;margin:24px 0;padding:0;display:grid;gap:12px}
.option{display:grid;grid-template-columns:42px 1fr;align-items:center;gap:13px;padding:15px;border:1px solid var(--line);border-radius:14px;cursor:pointer;transition:.16s}
.option:hover{border-color:#a99afc;background:#faf9ff}
.option:has(input:checked){border-color:var(--primary);background:#f3f0ff;box-shadow:0 0 0 2px rgba(91,61,245,.1)}
.option input{position:absolute;opacity:0;pointer-events:none}
.option-letter{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;background:#eef1f6;font-weight:900}
.result-shell{padding:80px 0;background:linear-gradient(160deg,#f5f2ff,#f7fbff);min-height:calc(100vh - 76px)}
.result-card{text-align:center;padding:46px;background:#fff;border-radius:26px;border:1px solid var(--line);box-shadow:var(--shadow)}
.result-icon{width:72px;height:72px;border-radius:50%;display:grid;place-items:center;margin:0 auto 18px;background:#dff8ec;color:var(--success);font-size:2rem;font-weight:900}
.result-card h1{font-size:2.4rem}
.result-card>p{color:var(--muted)}
.result-stats{grid-template-columns:repeat(4,1fr);margin:30px 0}
.result-stats strong{font-size:1.55rem}
.score-line{padding:17px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.error-code{font-size:6rem;font-weight:950;letter-spacing:-.08em;color:#dad5fe}
.auth-body{min-height:100vh;background:radial-gradient(circle at 20% 10%,rgba(91,61,245,.22),transparent 30%),#f5f7fb;display:grid;place-items:center;padding:24px}
.auth-shell{width:min(430px,100%)}
.auth-brand{justify-content:center;margin-bottom:24px}
.auth-card{padding:34px;background:#fff;border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow)}
.auth-card h1{font-size:2rem;margin-bottom:8px}
.auth-card p{color:var(--muted)}
.stack{display:grid;gap:16px;margin:24px 0}
label{font-size:.86rem;font-weight:750;color:#35445d;display:grid;gap:7px}
input,select,textarea{width:100%;border:1px solid #cdd6e3;border-radius:11px;padding:11px 13px;background:#fff;color:var(--ink);outline:none}
input:focus,select:focus,textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(91,61,245,.1)}
textarea{resize:vertical}
.admin-body{background:#f3f5f9}
.admin-shell{display:grid;grid-template-columns:250px 1fr;min-height:100vh}
.admin-sidebar{position:sticky;top:0;height:100vh;background:#10172b;color:#d9e1ef;padding:22px 16px;display:flex;flex-direction:column}
.admin-brand{padding:0 8px 22px;color:#fff}
.admin-sidebar nav{display:grid;gap:5px;flex:1}
.admin-sidebar nav a{padding:11px 12px;border-radius:10px;color:#b9c5d8;font-weight:700;font-size:.9rem}
.admin-sidebar nav a:hover{background:rgba(255,255,255,.08);color:#fff}
.admin-main{min-width:0}
.admin-topbar{height:70px;padding:0 28px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:12px;justify-content:space-between}
.admin-topbar div{display:grid;text-align:right}
.admin-topbar small{color:var(--muted)}
.sidebar-toggle{display:none;border:0;background:transparent;font-size:1.3rem}
.admin-main>.flash{margin-inline:28px}
.admin-content{padding:28px}
.admin-heading{display:flex;justify-content:space-between;align-items:end;gap:24px;margin-bottom:22px}
.admin-heading h1{font-size:2rem;margin:0 0 5px}
.admin-heading p{color:var(--muted);margin:0}
.metric-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:20px}
.metric-grid article,.panel{background:#fff;border:1px solid var(--line);border-radius:17px}
.metric-grid article{padding:20px;display:grid}
.metric-grid span,.metric-grid small{color:var(--muted)}
.metric-grid strong{font-size:2rem;margin:5px 0}
.admin-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:20px}
.panel{margin-bottom:20px}
.panel-heading{padding:18px 20px;border-bottom:1px solid var(--line)}
.panel-heading h2{font-size:1.05rem;margin:0}
.quick-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px;padding:20px}
.quick-actions a{padding:15px;border-radius:11px;background:var(--soft);font-weight:750}
.quick-actions a:hover{background:#eeeafe;color:var(--primary)}
.check-list{margin:0;padding:20px 25px 20px 42px}
.check-list li{margin:7px 0}
.table-wrap{overflow:auto}
table{width:100%;border-collapse:collapse;font-size:.88rem}
th,td{padding:14px 16px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
th{font-size:.73rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);background:#fafbfd}
tbody tr:last-child td{border-bottom:0}
.table-description{display:block;color:var(--muted);margin-top:3px;max-width:420px}
.question-cell{min-width:280px;max-width:520px}
code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.82em;background:#f0f2f6;padding:3px 6px;border-radius:6px}
.form-panel{padding:24px}
.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.span-2{grid-column:span 2}
.form-actions{padding-top:8px;border-top:1px solid var(--line)}
.options-editor{border:1px solid var(--line);border-radius:14px;padding:18px}
.options-editor h2{font-size:1rem}
.option-admin-row{display:grid;grid-template-columns:30px 1fr auto;gap:10px;align-items:center;margin:10px 0}
.option-admin-row>span{font-weight:900;text-align:center}
.radio-key{display:flex;align-items:center;white-space:nowrap}
.radio-key input{width:auto}
@media (max-width:950px){
  .hero-grid{grid-template-columns:1fr;gap:36px}.card-grid,.level-grid{grid-template-columns:repeat(2,1fr)}
  .steps-grid{grid-template-columns:repeat(2,1fr)}.result-stats{grid-template-columns:repeat(2,1fr)}
  .metric-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:760px){
  .container,.narrow,.narrow-wide{width:min(100% - 28px,1160px)}
  .main-nav{gap:12px;font-size:.87rem}.main-nav a:nth-child(2){display:none}
  .hero{padding:58px 0}.hero-card{transform:none}.section{padding:54px 0}
  .card-grid,.level-grid,.steps-grid{grid-template-columns:1fr}
  .topic-card{grid-template-columns:auto 1fr}.topic-side{display:none}
  .practice-header{align-items:start}.elapsed-box{min-width:auto}
  .admin-shell{grid-template-columns:1fr}.admin-sidebar{position:fixed;left:-270px;z-index:40;width:250px;transition:.2s}
  .admin-sidebar.open{left:0}.sidebar-toggle{display:block}.admin-topbar{justify-content:flex-start}.admin-topbar div{text-align:left}
  .admin-content{padding:18px}.admin-main>.flash{margin-inline:18px}
  .admin-heading{align-items:start;flex-direction:column}.admin-grid{grid-template-columns:1fr}
  .form-grid{grid-template-columns:1fr}.span-2{grid-column:span 1}
}
@media (max-width:540px){
  .nav-wrap{min-height:66px}.brand-mark{width:36px;height:36px}.brand small{display:none}
  .main-nav a:first-child{display:none}h1{font-size:2.45rem}
  .practice-header{display:grid}.elapsed-box{text-align:left}.question-card{padding:20px}
  .result-card{padding:28px 18px}.result-stats,.metric-grid{grid-template-columns:1fr 1fr}
  .footer-grid{display:grid}.option-admin-row{grid-template-columns:28px 1fr}.radio-key{grid-column:2}
}


/* Fase 2 · Academias, sedes y control Premium */
.badge.free{background:#e8fbf3;color:#087a55;border:1px solid #bcebd7}
.badge.premium{background:#f0ebff;color:#5633d8;border:1px solid #d3c7ff}
.badge.locked{background:#fff4dd;color:#8b5a00;border:1px solid #f1d69a}
.access-badge-row{display:flex;align-items:center;gap:7px;flex-wrap:wrap;margin-bottom:10px}
.hero-badges{margin:8px 0 2px}
.locked-card{position:relative;opacity:.78}
.locked-card:hover{opacity:1}
.locked-result .lock-big{font-size:3.2rem;margin-bottom:10px}
.block-link{display:block;margin-top:16px}
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.feature-card{background:#fff;border:1px solid var(--line);border-radius:17px;padding:20px;min-height:190px}
.feature-card h3{font-size:1.05rem;margin:10px 0 7px}
.feature-card p{color:var(--muted);font-size:.9rem}
.locked-note,.coming-note{margin-top:14px;padding:11px 12px;border-radius:10px;font-size:.82rem}
.locked-note{background:#fff8e8;color:#7b5409}
.coming-note{background:#f5f7fb;color:var(--muted)}
.soft-section{background:#f6f8fc}
.section-action{margin-top:22px}
.student-hero{background:linear-gradient(145deg,#f2efff,#f7fbff)}
.inline-form{display:inline}
.text-button{border:0;background:transparent;padding:0;color:inherit;font-weight:inherit}
.guide-university-card{padding:24px;margin-bottom:34px}
.guide-university-card h2{margin:8px 0}
.guide-university-card p{color:var(--muted);margin:0}
.heading-actions{display:flex;gap:10px;flex-wrap:wrap}
.admin-tabs{display:flex;gap:8px;flex-wrap:wrap;margin:-8px 0 20px}
.admin-tabs a{padding:9px 13px;background:#fff;border:1px solid var(--line);border-radius:999px;font-size:.84rem;font-weight:750}
.admin-tabs a:hover{border-color:#b8aafb;color:var(--primary)}
.section-anchor{scroll-margin-top:18px}
.academy-cell{display:flex;align-items:center;gap:12px;min-width:220px}
.academy-thumb,.academy-placeholder{width:42px;height:42px;border-radius:11px;flex:none}
.academy-thumb{object-fit:cover;border:1px solid var(--line);background:#fff}
.academy-placeholder{display:grid;place-items:center;background:#eeeafe;color:var(--primary);font-weight:900}
.academy-logo-preview{max-width:130px;max-height:70px;object-fit:contain;border:1px solid var(--line);border-radius:10px;padding:6px;background:#fff}
.inline-heading{display:flex;align-items:center;justify-content:space-between;gap:18px}
.stack-list{display:grid;gap:10px;padding:18px}
.admin-detail{border:1px solid var(--line);border-radius:13px;background:#fff}
.admin-detail summary{padding:14px 16px;display:flex;justify-content:space-between;align-items:center;gap:16px;cursor:pointer}
.admin-detail summary>div{display:grid;gap:3px}
.admin-detail summary small{color:var(--muted)}
.detail-content{padding:16px;border-top:1px solid var(--line);background:#fbfcfe}
.subform{padding:20px;border-top:1px solid var(--line);background:#fbfcfe}
.subform h3{margin:0 0 15px;font-size:1rem}
.access-priority{padding:18px 20px;display:grid;gap:5px}
.access-priority span{font-weight:800}
.access-priority small{color:var(--muted)}
.access-table select,.access-table input{min-width:140px}
.sticky-save{position:sticky;bottom:16px;display:flex;justify-content:flex-end;padding:12px;z-index:10}
.sticky-save .btn{box-shadow:0 10px 30px rgba(20,33,61,.16)}
.form-divider{padding:12px 0 4px;border-top:1px solid var(--line);display:grid;gap:3px}
.form-divider small{color:var(--muted);font-weight:500}
.checkbox-panel{border:1px solid var(--line);border-radius:13px;padding:16px}
.checkbox-panel legend{padding:0 7px;font-weight:800}
.checkbox-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.check-option{display:flex;align-items:flex-start;gap:10px;padding:11px;border:1px solid var(--line);border-radius:11px;background:#fff}
.check-option input{width:auto;margin-top:3px}
.check-option span{display:grid}
.check-option small{color:var(--muted);font-weight:500}
.info-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;padding:20px}
.info-grid>div{background:var(--soft);padding:14px;border-radius:11px;display:grid;gap:4px}
.info-grid small{color:var(--muted)}
.panel-footer{padding:0 20px 20px}
.muted-text{color:var(--muted)}
@media(max-width:1100px){.feature-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:760px){
  .feature-grid,.checkbox-grid,.info-grid{grid-template-columns:1fr}
  .heading-actions{width:100%}.heading-actions .btn{flex:1;text-align:center}
  .admin-detail summary{align-items:flex-start;flex-direction:column}
}
@media(max-width:540px){.feature-grid{grid-template-columns:1fr}}