/* Nivela · hoja de estilos única.
   Paleta propia (teal + violeta para "subir de nivel" + ámbar para racha/XP),
   mobile-first, objetivos de toque >=44px, prefers-reduced-motion, dark mode. */

:root{
  --paper:#F5F8F4; --grid:#E4EDE4; --card:#FFFFFF; --ink:#16261F;
  --muted:#5C6B66; --line:#DCE5DC;
  --primary:#029E72; --primary-d:#00583A; --primary-bg:#E0F3EA;
  --accent:#7C3AED; --accent-bg:#EFE7FD;         /* subir de nivel */
  --streak:#D97706; --streak-bg:#FDF0DC;         /* racha / XP */
  --ok:#15803D; --ok-bg:#E7F4EA;
  --bad:#BE123C; --bad-bg:#FCE7EC;
  --locked:#9CA3AF; --locked-bg:#F1F1EE;
  --paes:#4056D6; --paes-d:#2E3FA3; --paes-bg:#E7EAFB;
  --serif:ui-serif, Georgia, "Times New Roman", serif; /* solo notación matemática */
  --sans:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --disp:ui-rounded, "SF Pro Rounded", var(--sans); /* display: títulos, botones, marca */
  --radius:16px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

@media (prefers-color-scheme: dark){
  :root{
    --paper:#0F1713; --grid:#1A241E; --card:#18211C; --ink:#EAF2EC;
    --muted:#93A69B; --line:#28352D;
    --primary:#31C48D; --primary-d:#7BE0BC; --primary-bg:#123227;
    --accent:#A78BFA; --accent-bg:#241A3D;
    --streak:#FBBF24; --streak-bg:#3A2A0E;
    --ok:#4ADE80; --ok-bg:#123422;
    --bad:#FB7185; --bad-bg:#3A1420;
    --locked:#6B7280; --locked-bg:#20272A;
    --paes:#8B9BF4; --paes-d:#AAB6F7; --paes-bg:#1F2547;
  }
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0; color:var(--ink); font-family:var(--sans); font-size:17px; line-height:1.55;
  background-color:var(--paper);
  -webkit-font-smoothing:antialiased;
  padding-bottom:calc(24px + var(--safe-bottom));
  min-height:100vh;
}
.wrap{max-width:600px; margin:0 auto; padding:0 16px}
.boot-msg{text-align:center; color:var(--muted); padding:40px 16px; font-family:var(--sans)}

button{font-family:var(--sans)}
a{color:var(--primary)}

/* ---------- Marca (wordmark: la "v" de Nivela es una raíz con su vínculo) ---------- */
.brandrow{max-width:600px; margin:0 auto; padding:10px 16px 2px; display:flex; align-items:center}
.logotipo{font-weight:800; font-size:25px; letter-spacing:-.02em; color:var(--primary-d);
  display:inline-flex; align-items:baseline; line-height:1; user-select:none}
.logotipo .lv{color:var(--primary); font-weight:900; font-size:.9em; margin:0 0 0 .05em}
.logotipo .lrest{border-top:3px solid var(--primary); padding-top:2px}
.profile-link{margin-left:auto; padding:7px 14px; min-height:38px}

/* ---------- Nav ---------- */
.app-nav{position:sticky; top:0; z-index:20; background:color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter:saturate(140%) blur(6px); border-bottom:1px solid var(--line); padding:2px 0 8px; margin-bottom:16px}
.navrow{display:flex; gap:8px; overflow-x:auto; padding:0 16px; max-width:600px; margin:0 auto;
  -webkit-overflow-scrolling:touch; scrollbar-width:none}
.navrow::-webkit-scrollbar{display:none}
.tab{flex:0 0 auto; border:1px solid var(--line); background:var(--card); color:var(--ink);
  font-family:var(--disp); font-weight:700; font-size:15px; padding:10px 16px; border-radius:999px; cursor:pointer;
  min-height:44px; white-space:nowrap; transition:all .15s}
.tab:hover{border-color:var(--primary)}
.tab.active{background:var(--primary); color:#fff; border-color:var(--primary)}

.panel{display:none; animation:fade .25s ease}
.panel.active{display:block}
@keyframes fade{from{opacity:0; transform:translateY(6px)}to{opacity:1; transform:none}}

/* ---------- Cards ---------- */
.card{background:var(--card); border:1px solid var(--line); border-radius:var(--radius);
  padding:20px 22px; margin:16px 0; box-shadow:0 1px 0 rgba(0,0,0,.03)}
.card h2{font-family:var(--disp); font-weight:800; font-size:22px; margin:2px 0 4px; letter-spacing:-.01em}
.card h3{font-family:var(--disp); font-weight:800; font-size:18px; margin:18px 0 8px}
.lead{color:var(--muted); margin:0 0 8px}
.divider{height:1px; background:var(--line); border:0; margin:16px 0}

/* ---------- Math typography (reutilizado tal cual del banco de origen) ---------- */
.m{font-family:var(--serif)}
.m i{font-style:italic}
sup{font-size:.72em}
.f{display:inline-flex; flex-direction:column; vertical-align:middle; text-align:center;
  margin:0 .14em; line-height:1.02; font-family:var(--serif)}
.f>span:first-child{border-bottom:1.5px solid currentColor; padding:0 .32em}
.f>span:last-child{padding:1px .32em 0}
.rb{border-top:1.6px solid currentColor; padding:1px .16em 0 .2em}
.ri{font-size:.62em; vertical-align:.55em; margin-right:-.26em}

/* ---------- Property/example/trap boxes (lecciones) ---------- */
.props{display:grid; grid-template-columns:1fr 1fr; gap:10px; margin:12px 0}
.prop{background:var(--primary-bg); border:1px solid var(--line); border-radius:12px; padding:12px 14px}
.prop .name{font-size:13px; color:var(--primary-d); font-weight:700; margin-bottom:4px}
.prop .rule{font-family:var(--serif); font-size:20px}
@media(max-width:560px){.props{grid-template-columns:1fr}}

.example{background:var(--primary-bg); border-left:4px solid var(--primary); border-radius:0 12px 12px 0;
  padding:12px 16px; margin:12px 0}
.example .tag{font-size:12px; text-transform:uppercase; letter-spacing:.08em; color:var(--primary-d);
  font-weight:700; margin-bottom:6px}
.step{font-family:var(--serif); font-size:18px; margin:5px 0}
.step .arrow{color:var(--muted); font-family:var(--sans); font-size:14px; margin:0 6px}

.trap{background:var(--streak-bg); border:1px solid color-mix(in srgb, var(--streak) 35%, var(--line)); border-radius:12px; padding:12px 16px; margin:12px 0}
.trap b{color:var(--streak)}

/* ---------- Botones ---------- */
.btn{background:var(--primary); color:#fff; border:0; border-radius:14px; padding:14px 20px;
  font-family:var(--disp); font-weight:800; font-size:16px; cursor:pointer; min-height:48px}
.btn:hover{background:var(--primary-d)}
.btn.ghost{background:transparent; color:var(--primary); border:1.5px solid var(--primary)}
.btn.accent{background:var(--accent)}
.btn:disabled{opacity:.45; cursor:default}
.btn.block{width:100%}

/* ---------- Quiz / opciones ---------- */
.qmeta{display:flex; justify-content:space-between; align-items:center; color:var(--muted); font-size:14px; margin-bottom:6px}
.qtext{font-size:19px; margin:6px 0 14px; font-family:var(--serif)}
.table-scroll{max-width:100%; overflow-x:auto; margin:14px 0; -webkit-overflow-scrolling:touch}
.data-table{width:100%; min-width:320px; border-collapse:collapse; font-family:var(--sans); font-size:16px}
.data-table th,.data-table td{padding:10px 12px; border:1px solid var(--line); text-align:left; vertical-align:top}
.data-table th{background:var(--bg); font-weight:700}
.opt{display:block; width:100%; text-align:left; background:var(--card); border:1.5px solid var(--line);
  border-radius:12px; padding:14px 16px; margin:9px 0; font-size:17px; font-family:var(--serif);
  cursor:pointer; min-height:52px; transition:all .12s}
.opt:hover:not(:disabled){border-color:var(--primary)}
.opt .lab{font-family:var(--sans); font-weight:700; color:var(--muted); margin-right:10px}
.opt.correct{background:var(--ok-bg); border-color:var(--ok)}
.opt.correct .lab{color:var(--ok)}
.opt.wrong{background:var(--bad-bg); border-color:var(--bad)}
.opt.wrong .lab{color:var(--bad)}
.opt:disabled{cursor:default}
.exp{background:var(--primary-bg); border-radius:12px; padding:12px 16px; margin-top:10px; font-size:16px;
  border:1px solid var(--line)}
.qfoot{display:flex; justify-content:space-between; align-items:center; margin-top:14px; gap:10px}
.result{text-align:center; padding:10px 0}
.result .big{font-family:var(--disp); font-weight:800; font-size:42px; color:var(--primary)}

/* ---------- Progreso / mastery ---------- */
.progress-bar{height:11px; background:var(--locked-bg); border-radius:999px; overflow:hidden}
.progress-bar>span{display:block; height:100%; width:0; background:var(--primary); border-radius:999px; transition:width .35s ease}
.progress-bar.dia>span{background:var(--streak)}
.meta-dia{display:flex; justify-content:space-between; align-items:baseline; font-size:14px; color:var(--muted); font-weight:600; margin-bottom:7px}
.progress-label{font-size:14px; color:var(--muted); margin-top:7px; font-weight:600}

/* ---------- Home v2: Continuar + mapa por ejes ---------- */
.continuar-card{border:2px solid var(--primary); box-shadow:0 8px 22px rgba(0,88,58,.10)}
.btn.grande{font-size:17px; border-radius:14px; box-shadow:0 4px 0 var(--primary-d)}
.btn.grande:active{transform:translateY(2px); box-shadow:0 2px 0 var(--primary-d)}

.eje-head{display:flex; align-items:center; gap:10px; padding:16px 2px 4px}
.eje-head .ico{font-size:18px}
.eje-head h3{font-family:var(--disp); font-weight:800; font-size:17px; margin:0}
.eje-head .avance{margin-left:auto; font-size:12.5px; color:var(--muted); font-weight:700}
.camino{display:flex; flex-direction:column; padding-left:6px}
.nodo{display:flex; align-items:center; gap:14px; background:none; border:0; text-align:left;
  padding:8px 4px; cursor:pointer; font:inherit; color:inherit; width:100%; border-radius:12px}
.nodo:hover:not(:disabled){background:var(--primary-bg)}
.nodo:disabled{cursor:default}
.nodo .aro{flex:0 0 auto; width:52px; height:52px; border-radius:50%; display:grid; place-items:center;
  font-size:20px; position:relative;
  background:conic-gradient(var(--primary) calc(var(--pct,0)*1%), var(--locked-bg) 0)}
.nodo .aro::after{content:""; position:absolute; inset:5px; border-radius:50%; background:var(--card); border:1px solid var(--line)}
.nodo .aro em{position:relative; z-index:1; font-style:normal}
.nodo.dominado .aro, .nodo.dominado .aro::after{background:var(--primary)}
.nodo.bloqueado{opacity:.55}
.nodo.bloqueado .aro{background:var(--locked-bg)}
.nodo .info b{display:block; font-size:15.5px}
.nodo .info span{font-size:12.5px; color:var(--muted); font-weight:600}
.conector{width:3px; height:12px; background:var(--line); border-radius:2px; margin-left:30px}

/* Mapa de temas */
.topicmap{display:grid; gap:10px}
.topiccard{border:1.5px solid var(--line); border-radius:14px; background:var(--card); overflow:hidden}
.topiccard.locked{opacity:.6}
.topiccard.mastered{border-color:var(--primary)}
.topiccard-main{display:flex; align-items:center; gap:14px; padding:14px 16px; border:0; background:transparent;
  cursor:pointer; min-height:44px; text-align:left; width:100%; font:inherit; color:inherit}
.topiccard-main:disabled{cursor:not-allowed}
.topiccard .ring{flex:0 0 auto; width:46px; height:46px; border-radius:50%; display:flex; align-items:center;
  justify-content:center; font-family:var(--serif); font-weight:700; font-size:14px;
  background:conic-gradient(var(--primary) calc(var(--pct,0)*1%), var(--locked-bg) 0);}
.topiccard .ring .inner{width:36px; height:36px; border-radius:50%; background:var(--card); display:flex;
  align-items:center; justify-content:center; font-size:12px; color:var(--muted)}
.topiccard.mastered .ring .inner{color:var(--primary-d); font-weight:700}
.topiccard .body{flex:1}
.topiccard .body h4{margin:0 0 2px; font-size:16px}
.topiccard .body p{margin:0; font-size:13px; color:var(--muted)}
.topiccard .lock{font-size:20px; color:var(--locked)}
.topiccard-test,.topiccard-learn{width:calc(100% - 32px); margin:0 16px 14px; font-size:14px; padding:9px 14px; min-height:40px}
.topiccard-learn + .topiccard-test{margin-top:-6px}

/* ---------- Modo PAES (lente índigo sobre el mismo grafo) ---------- */
.tab.active[data-tab="paes"]{background:var(--paes); border-color:var(--paes)}
.card.paes-b{border:2px solid var(--paes)}
.eyebrow-paes{font-size:11px; letter-spacing:.14em; text-transform:uppercase; color:var(--paes); font-weight:700; margin-bottom:6px}
.btn.paes{background:var(--paes)}
.btn.paes:hover{background:var(--paes-d)}
.proye{display:flex; align-items:center; gap:14px}
.cob-num{font-family:var(--disp); font-weight:800; font-size:44px; color:var(--paes); line-height:1}
.cob-fila{display:flex; justify-content:space-between; align-items:center; font-size:14.5px; padding:8px 0; border-bottom:1px solid var(--line)}
.cob-fila:last-child{border-bottom:0}
.cob-der{display:flex; align-items:center; gap:8px}
.cob-mini{width:96px; height:7px; background:var(--locked-bg); border-radius:4px; overflow:hidden; display:inline-block}
.cob-mini i{display:block; height:100%; background:var(--paes)}
.cob-num-mini{font-size:12.5px; color:var(--muted); font-weight:700; min-width:34px; text-align:right; font-variant-numeric:tabular-nums}

/* ---------- Onboarding v2 (meta → curso → perfil → diagnóstico) ---------- */
.onb{max-width:480px; padding-top:28px}
.hero-onb{font-size:38px; margin:0 auto 14px; display:flex; justify-content:center}
.pasos{display:flex; gap:6px; margin-bottom:4px}
.pasos i{height:5px; flex:1; border-radius:3px; background:var(--line)}
.pasos i.on{background:var(--primary)}
.metacard{display:flex; gap:14px; align-items:center; text-align:left; width:100%;
  background:var(--card); border:2px solid var(--line); border-radius:16px; padding:14px 16px;
  cursor:pointer; font:inherit; color:inherit; margin-top:10px; min-height:52px}
.metacard .ico{font-size:24px; width:44px; height:44px; border-radius:12px; display:grid; place-items:center; background:var(--primary-bg); flex:0 0 auto}
.metacard b{display:block; font-size:15.5px}
.metacard span span{color:var(--muted); font-size:13px; line-height:1.35; display:block; margin-top:2px}
.metacard.sel{border-color:var(--primary); background:var(--primary-bg)}
.cursogrid{display:grid; grid-template-columns:1fr 1fr; gap:10px; margin-top:4px}
.cursogrid .metacard{margin-top:0; justify-content:center; text-align:center}

/* ---------- Prueba de práctica (examen con nota) ---------- */
.nota-val{font-family:var(--disp); font-weight:800; font-size:58px; line-height:1.1}
.nota-val.aprobado{color:var(--ok)}
.nota-val.rojo{color:var(--bad)}
.exam-error{border:1.5px solid var(--line); border-radius:12px; padding:12px 14px; margin:10px 0}
.exam-error .tag{font-size:11.5px; font-weight:700; color:var(--bad); text-transform:uppercase; letter-spacing:.07em; margin-bottom:6px}
.sizechip{cursor:pointer; border:1.5px solid var(--line); background:var(--card); color:var(--ink); font-family:var(--disp)}
.sizechip.active{border-color:var(--primary); background:var(--primary-bg); color:var(--primary-d)}

/* ---------- Chips: racha, XP, nivel ---------- */
.chiprow{display:flex; gap:8px; flex-wrap:wrap; margin:10px 0}
.chip{display:inline-flex; align-items:center; gap:6px; border-radius:999px; padding:7px 13px; font-weight:700; font-size:14px}
.chip.streak{background:var(--streak-bg); color:var(--streak)}
.chip.xp{background:var(--accent-bg); color:var(--accent)}
.chip.level{background:var(--primary-bg); color:var(--primary-d)}

/* ---------- Actividad diaria (barras) ---------- */
.dailychart{display:flex; align-items:flex-end; gap:6px; height:90px; margin:10px 0}
.dailychart .bar{flex:1; display:flex; flex-direction:column; align-items:center; gap:6px}
.dailychart .col{width:100%; max-width:22px; background:var(--locked-bg); border-radius:6px 6px 2px 2px; position:relative; height:64px; display:flex; align-items:flex-end}
.dailychart .col > span{display:block; width:100%; background:var(--primary); border-radius:6px 6px 2px 2px}
.dailychart .col.goal > span{background:var(--streak)}
.dailychart small{font-size:11px; color:var(--muted)}

/* ---------- Flashcards (aprende) ---------- */
.deck{display:grid; grid-template-columns:1fr 1fr; gap:12px}
@media(max-width:560px){.deck{grid-template-columns:1fr}}
.flip{background:var(--card); border:1.5px solid var(--line); border-radius:14px; min-height:96px;
  padding:16px; cursor:pointer; display:flex; align-items:center; justify-content:center; text-align:center;
  font:inherit; color:inherit; width:100%}
.flip.solo{min-height:150px; font-size:19px; margin:8px 0}
.deck-head{display:flex; align-items:center; justify-content:space-between; gap:10px; margin:6px 0 10px}
.deck-head .btn{min-height:40px; padding:8px 14px; font-size:14px}
.flip .front{font-weight:600; color:var(--ink)}
.flip .back{display:none; font-family:var(--serif); font-size:20px; color:var(--primary-d)}
.flip.on .front{display:none}
.flip.on .back{display:block}
.flip.on{background:var(--primary-bg); border-color:var(--primary)}

/* ---------- Lecciones (Aprende) ---------- */
.lesson{border:1px solid var(--line); border-radius:12px; padding:4px 14px; margin:10px 0; background:var(--card)}
.lesson summary{cursor:pointer; padding:10px 0; font-weight:700; font-family:var(--disp); font-size:17px; min-height:44px; display:flex; align-items:center}
.lesson-body{padding:4px 0 14px}
.learn-search-label{display:block; margin:16px 0 6px; font-weight:700}
.learn-search{width:100%; min-height:48px; padding:10px 14px; border:1.5px solid var(--line); border-radius:12px; background:var(--card); color:var(--text); font:inherit}
.learn-search:focus{outline:3px solid color-mix(in srgb,var(--primary) 25%,transparent); border-color:var(--primary)}
.learn-topic-head{display:flex; align-items:center; justify-content:space-between; gap:12px}
.learn-topic-head h3{margin-right:auto}
.pin-btn{flex:0 0 auto; min-height:40px; padding:8px 12px; font-size:14px}
.pin-btn.active{border-color:var(--primary); color:var(--primary-d)}
.learn-topic.pinned{border-color:var(--primary)}
.learn-topic.focused{box-shadow:0 0 0 3px color-mix(in srgb,var(--primary) 22%,transparent)}
.account-entry{margin-top:22px; padding-top:16px; border-top:1px solid var(--line)}
.account-entry .btn + .btn{margin-top:8px}
.recovery-result{margin-top:14px; padding:14px; border-radius:12px; background:var(--bg)}
.recovery-result code{display:block; font-size:18px; font-weight:700; letter-spacing:.06em; overflow-wrap:anywhere}
.admin-filters{display:flex; gap:12px; align-items:end; flex-wrap:wrap}
.admin-filters label{display:grid; gap:5px; font-weight:700}
.admin-filters input{min-height:42px; padding:8px; border:1px solid var(--line); border-radius:9px}
.admin-filters select{min-height:42px; padding:8px; border:1px solid var(--line); border-radius:9px; background:var(--card)}
.admin-kpis{display:grid; grid-template-columns:repeat(auto-fit,minmax(130px,1fr)); gap:10px}
.admin-kpi{display:grid; gap:6px}
.admin-kpi span{color:var(--muted)}
.admin-kpi b{font-size:26px}
.admin-table-card .data-table{font-size:14px}
.link-btn{border:0;background:none;color:var(--primary-d);font:inherit;font-weight:700;text-decoration:underline;cursor:pointer;padding:0}

/* ---------- Onboarding ---------- */
.avatarrow{display:flex; gap:10px; flex-wrap:wrap; margin:12px 0}
.avatarbtn{font-size:28px; width:56px; height:56px; border-radius:50%; border:2px solid var(--line);
  background:var(--card); cursor:pointer}
.avatarbtn.active{border-color:var(--primary); background:var(--primary-bg)}
input[type="text"]{width:100%; font-size:17px; padding:14px 16px; border:1.5px solid var(--line);
  border-radius:12px; background:var(--card); color:var(--ink); min-height:48px}
input[type="text"]:focus{outline:2px solid var(--primary); border-color:var(--primary)}

/* ---------- Figuras SVG en ejercicios ---------- */
/* Los SVG llegan inline en stem/options/explanation (validados por
   check-content). Se dibujan con currentColor para heredar el tema. */
.qtext svg, .opt svg, .exp svg, .lesson-body svg{
  max-width:100%; height:auto; display:block; margin:10px auto}
.opt svg{margin:4px 0 4px 8px; max-height:90px}

.footnote{text-align:center; color:var(--muted); font-size:13px; margin:26px 0 8px}
.empty{text-align:center; color:var(--muted); padding:20px}

@media(prefers-reduced-motion:reduce){*{animation:none!important; transition:none!important}}