:root{
  --bg:#f3f5f7; --surface:#fff; --surface2:#eef2f6; --ink:#132033; --muted:#5e6978;
  --line:#d8e0e8; --navy:#173a5e; --blue:#1d659e; --blue2:#e8f1f8;
  --green:#1f6a45; --greenbg:#eaf5ef; --amber:#8a5c14; --amberbg:#fff6df;
  --red:#973a3a; --redbg:#fff0f0; --radius:16px; --shadow:0 12px 30px rgba(23,58,94,.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,Segoe UI,Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.55}
.wrap{width:min(1180px,calc(100% - 36px));margin:auto}
.topbar{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(10px)}
.nav{min-height:64px;display:flex;justify-content:space-between;align-items:center;gap:24px}
.brand{text-decoration:none;font-weight:900;letter-spacing:-.02em}.brand span{color:var(--blue)}
nav{display:flex;gap:22px;flex-wrap:wrap}nav a{text-decoration:none;color:var(--muted);font-size:.92rem;font-weight:650}nav a:hover{color:var(--blue)}
.hero{background:linear-gradient(180deg,#fff,#f3f6f9);padding:78px 0 68px}
.hero-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:42px;align-items:center}
.badges{display:flex;gap:8px;flex-wrap:wrap}.badge{background:var(--blue2);color:var(--navy);border-radius:999px;padding:7px 11px;font-size:.76rem;font-weight:800}
h1{font-size:clamp(3rem,7vw,5.6rem);line-height:.92;letter-spacing:-.055em;margin:.2em 0 .28em}
h2{font-size:clamp(1.75rem,3.4vw,2.7rem);line-height:1.08;letter-spacing:-.035em;margin:.2em 0 .45em}
h3{font-size:1.08rem;margin:0 0 10px}
.lead{font-size:1.2rem;color:var(--muted);max-width:760px}.meta{color:var(--muted);font-size:.9rem;margin-top:26px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}
.scope-card,.panel,.chart-panel,.calc-trace,.disclaimer{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.scope-card p{color:var(--muted)}.scope-flow{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-top:20px}.scope-flow b{background:var(--surface2);padding:7px 10px;border-radius:8px}.scope-flow i{font-style:normal;color:var(--blue)}
.btn{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:10px;padding:11px 16px;background:#fff;color:var(--ink);font-weight:800;text-decoration:none;cursor:pointer;font:inherit}.btn:hover{transform:translateY(-1px)}.btn.primary{background:var(--blue);border-color:var(--blue);color:#fff}.btn.ghost{background:transparent}.btn.big{padding:14px 20px;margin-top:22px}
.section{padding:72px 0}.section.compact{padding:52px 0}.section.alt{background:#fff}
.section-head{max-width:820px;margin-bottom:27px}.section-head.sub{margin-top:50px}.section-head p{color:var(--muted);font-size:1.03rem}
.eyebrow,.step-tag{text-transform:uppercase;letter-spacing:.1em;font-size:.73rem;font-weight:900;color:var(--blue)}.step-tag{display:inline-block;background:var(--blue2);padding:6px 9px;border-radius:7px}
.route{display:grid;grid-template-columns:repeat(6,1fr);gap:10px}.route>div{border:1px solid var(--line);border-radius:13px;padding:16px;background:var(--surface)}.route span{display:grid;place-items:center;width:32px;height:32px;border-radius:50%;background:var(--blue2);color:var(--blue);font-weight:900;margin-bottom:10px}.route b,.route small{display:block}.route small{color:var(--muted);margin-top:4px}
.form-grid{display:grid;gap:14px}.form-grid.three{grid-template-columns:repeat(3,1fr)}.form-grid.four{grid-template-columns:repeat(4,1fr)}.form-grid.two{grid-template-columns:repeat(2,1fr)}
label{font-size:.88rem;font-weight:800;color:#29384b}select,input[type=number]{width:100%;margin-top:6px;padding:10px 11px;border:1px solid #bfc9d4;border-radius:9px;background:#fff;color:var(--ink);font:inherit}
select:disabled{background:#f1f3f5;color:#8b95a3}.second-row{margin-top:18px}
.summary-strip{margin-top:18px;border-radius:11px;padding:14px 16px;background:var(--blue2);color:var(--navy);font-weight:700}.summary-strip.waiting{background:#f2f4f6;color:var(--muted)}
.formula-callout{margin-top:18px;border:1px solid var(--line);border-radius:12px;padding:17px;background:#f8fafc;display:grid;gap:3px}.formula-callout span,.formula-callout small{color:var(--muted)}.formula-callout strong{font-size:1.18rem}
.alert{margin-top:17px;padding:14px 16px;border-radius:11px;border:1px solid var(--line)}.alert.info{background:var(--blue2);color:var(--navy)}.alert.danger{background:var(--redbg);color:var(--red);border-color:#edcaca}.alert.warning{background:var(--amberbg);color:var(--amber);border-color:#f0dfae}.alert.success{background:var(--greenbg);color:var(--green);border-color:#c9e4d4}
.hidden{display:none!important}
.mode-switch{display:grid;grid-template-columns:repeat(2,1fr);gap:13px;margin-bottom:18px}.mode{border:1px solid var(--line);border-radius:13px;padding:16px;display:flex;gap:10px;align-items:flex-start;cursor:pointer}.mode input{margin-top:4px}.mode b,.mode small{display:block}.mode small{color:var(--muted);margin-top:3px}
.estimate-box{background:#f7f9fb;border:1px solid var(--line);padding:18px;border-radius:14px;margin-bottom:18px}.checkbox-label{display:flex;gap:9px;align-items:center;border:1px solid var(--line);border-radius:10px;padding:9px 11px;background:#fff}.checkbox-label input{width:auto}.checkbox-label b,.checkbox-label small{display:block}.checkbox-label small{color:var(--muted)}
.table-wrap{overflow:auto;margin-top:18px;border:1px solid var(--line);border-radius:12px}table{width:100%;border-collapse:collapse;min-width:720px;background:#fff}th,td{padding:10px 9px;border-bottom:1px solid var(--line);text-align:right;font-size:.9rem}th{background:#f1f4f7;font-weight:900;position:sticky;top:0}th:first-child,td:first-child{text-align:left}td input{min-width:90px;margin:0;padding:7px 8px}
.period-choice{display:grid;grid-template-columns:minmax(250px,420px) 1fr;gap:18px;align-items:end;margin-top:18px}.micro-note{color:var(--muted);font-size:.9rem}
.placeholder{border:1px dashed #b9c4cf;border-radius:14px;padding:28px;text-align:center;color:var(--muted);background:#fafbfc}
.metric-grid{display:grid;gap:10px}.metric-grid.eight{grid-template-columns:repeat(8,1fr)}.metric-grid>div,.mini-metrics>div{border:1px solid var(--line);border-radius:12px;padding:14px;background:#fff}.metric-grid span,.mini-metrics span{display:block;color:var(--muted);font-size:.77rem}.metric-grid b,.mini-metrics b{font-size:1.22rem}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:18px}.calc-trace p{color:var(--muted)}.big-value{display:flex;justify-content:space-between;align-items:end;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:12px 0;margin:12px 0 20px}.big-value span{color:var(--muted)}.big-value b{font-size:1.7rem}.mini-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:9px;margin-bottom:20px}.branch-box{background:#f0f5fa;border-left:4px solid var(--blue);padding:13px 14px;border-radius:8px;font-weight:750}
.chart-panel{box-shadow:none}svg{width:100%;height:auto;display:block}
.result-hero{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.result-hero>div{background:var(--navy);color:white;padding:19px;border-radius:14px}.result-hero span,.result-hero small{display:block;color:#c7d6e6}.result-hero b{display:block;font-size:1.55rem;margin:4px 0}.result-layout{grid-template-columns:1.45fr .55fr}
.check{margin-top:15px;padding:13px;border-radius:10px;font-weight:800}.check.success{background:var(--greenbg);color:var(--green)}
.answer-summary{margin-top:16px;font-weight:800}.ans-ok{color:var(--green);font-weight:900}.ans-bad{color:var(--red);font-weight:900}
.quiz-question{padding:18px 0;border-bottom:1px solid var(--line)}.quiz-question:first-child{padding-top:0}.quiz-question p{margin:0 0 10px;font-weight:800}.quiz-question label{display:block;font-weight:500;margin:7px 0}.quiz-question input{margin-right:8px}.quiz-actions{margin-top:20px;display:flex;gap:12px;align-items:center;flex-wrap:wrap}.quiz-score{font-size:1.1rem;font-weight:900}
.refs{padding-left:20px}.refs li{margin:7px 0}.disclaimer{background:#17263a;color:white}.disclaimer p{color:#d0d9e5}
footer{background:#0f1928;color:#cbd5e1;padding:22px 0;font-size:.86rem}.footer-inner{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
@media(max-width:1000px){.hero-grid,.two-col,.result-layout{grid-template-columns:1fr}.route{grid-template-columns:repeat(3,1fr)}.metric-grid.eight{grid-template-columns:repeat(4,1fr)}.result-hero{grid-template-columns:repeat(2,1fr)}}
@media(max-width:760px){nav{display:none}.form-grid.three,.form-grid.four,.form-grid.two,.mode-switch,.period-choice{grid-template-columns:1fr}.route{grid-template-columns:repeat(2,1fr)}.metric-grid.eight{grid-template-columns:repeat(2,1fr)}.section{padding:54px 0}.hero{padding:56px 0}}
@media(max-width:480px){.route,.result-hero{grid-template-columns:1fr}}


/* Perfil docente */
.nav-teacher{
  border:0;
  background:transparent;
  color:var(--muted);
  font:inherit;
  font-size:.92rem;
  font-weight:650;
  cursor:pointer;
  padding:0;
}
.nav-teacher:hover{color:var(--blue)}
.teacher-btn{
  background:#f7f9fb;
  border-color:#bdcbd8;
  color:var(--navy);
}
.modal-backdrop{
  position:fixed;
  inset:0;
  z-index:1000;
  background:rgba(8,17,30,.72);
  display:grid;
  place-items:center;
  padding:24px;
  overflow:auto;
}
.teacher-modal{
  position:relative;
  width:min(980px,100%);
  max-height:calc(100vh - 48px);
  overflow:auto;
  background:#fff;
  border-radius:22px;
  border:1px solid var(--line);
  box-shadow:0 30px 80px rgba(0,0,0,.28);
}
.modal-close{
  position:absolute;
  top:14px;
  right:16px;
  z-index:2;
  width:42px;
  height:42px;
  border-radius:50%;
  border:1px solid var(--line);
  background:#fff;
  color:var(--ink);
  font-size:1.8rem;
  line-height:1;
  cursor:pointer;
}
.modal-close:hover{background:#f2f5f8}
.teacher-profile{
  display:grid;
  grid-template-columns:330px 1fr;
  gap:34px;
  align-items:center;
  padding:38px;
}
.teacher-photo-wrap{
  display:flex;
  align-items:center;
  justify-content:center;
}
.teacher-photo{
  width:100%;
  max-width:310px;
  aspect-ratio:1/1;
  object-fit:cover;
  border-radius:50%;
  border:8px solid #f2f5f8;
  box-shadow:0 14px 34px rgba(23,58,94,.13);
}
.teacher-content h2{
  margin-top:.2em;
  font-size:clamp(1.8rem,3.2vw,2.6rem);
}
.teacher-content p{color:#465467}
.teacher-degree{
  color:var(--navy)!important;
  font-size:1.05rem;
}
.teacher-tags{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin-top:20px;
}
.teacher-tags span{
  background:var(--blue2);
  color:var(--navy);
  border-radius:999px;
  padding:7px 10px;
  font-size:.78rem;
  font-weight:800;
}
body.modal-open{overflow:hidden}

@media(max-width:780px){
  .teacher-profile{
    grid-template-columns:1fr;
    padding:30px 22px 26px;
  }
  .teacher-photo{max-width:230px}
}


/* V2.2 · validación de entradas y verificación secuencial */
.calculator-domain-note{
  margin-top:18px;
  padding:13px 15px;
  border-radius:11px;
  border:1px solid #cfdae5;
  background:#f4f8fb;
  color:var(--navy);
  font-size:.92rem;
}
.input-invalid{
  border-color:#b83b3b!important;
  background:#fff3f3!important;
  box-shadow:0 0 0 2px rgba(184,59,59,.08);
}
.disabled-btn,
button:disabled{
  opacity:.55;
  cursor:not-allowed;
  transform:none!important;
}
.verification-stage{
  display:grid;
  grid-template-columns:50px 1fr;
  gap:16px;
  align-items:start;
  padding:18px 0;
}
.verification-stage + .verification-stage{
  border-top:1px solid var(--line);
  margin-top:18px;
  padding-top:24px;
}
.verification-number{
  width:42px;
  height:42px;
  border-radius:50%;
  display:grid;
  place-items:center;
  background:var(--blue2);
  color:var(--blue);
  font-weight:900;
  font-size:1.1rem;
}
.verification-body h3{margin-top:0}
.verification-body p{color:var(--muted)}
.basal-check-row{
  display:grid;
  grid-template-columns:minmax(240px,420px) auto;
  gap:12px;
  align-items:end;
  margin-top:14px;
}
.verification-feedback{
  margin-top:13px;
  min-height:24px;
  font-weight:700;
}
.locked-stage{opacity:1}
@media(max-width:640px){
  .verification-stage{grid-template-columns:1fr}
  .verification-number{margin-bottom:2px}
  .basal-check-row{grid-template-columns:1fr}
}