/* =============================================================================
   PÁGINAS INTERNAS — Recursos y herramientas
   Se apoya en styles.css: aquí sólo van la cáscara de página (barra, portada,
   pie) y los componentes propios de las herramientas.
   ============================================================================= */

/* ------------------------------------------------------------ 1. CÁSCARA */
.page-nav {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 800;
  padding: .8rem 0;
}
/* El fondo va en un pseudo-elemento: un backdrop-filter sobre .page-nav
   crearía un bloque contenedor para cualquier hijo position:fixed. */
.page-nav::before {
  content: '';
  position: absolute; inset: 0;
  z-index: -1;
  background: rgba(5, 7, 13, .85);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--stroke);
}

.page-nav-in {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem;
}
.page-nav-actions { display: flex; align-items: center; gap: .5rem; }

.back-link {
  display: inline-flex; align-items: center; gap: .45rem;
  padding: .55rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--stroke-strong);
  background: var(--surface);
  font-size: .85rem; font-weight: 500;
  color: var(--muted);
  transition: all .35s var(--ease);
}
.back-link:hover { color: #fff; border-color: var(--brand); background: var(--brand-soft); }

/* Migas de pan */
.breadcrumb {
  display: flex; flex-wrap: wrap; align-items: center; gap: .45rem;
  margin: 0 0 1.6rem;
  padding: 0;
  list-style: none;
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--faint);
}
.breadcrumb a { color: var(--brand); transition: opacity .3s; }
.breadcrumb a:hover { opacity: .7; }
.breadcrumb li:not(:last-child)::after { content: '/'; margin-left: .45rem; color: var(--stroke-strong); }

/* Portada de página interna */
.page-hero {
  position: relative;
  padding: clamp(7rem, 14vw, 9.5rem) 0 clamp(2.5rem, 5vw, 4rem);
  overflow: hidden;
  isolation: isolate;
}
.page-hero::before {
  content: '';
  position: absolute; inset: 0; z-index: -1;
  background:
    radial-gradient(ellipse 60% 90% at 15% 0%, rgba(34, 211, 238, .1), transparent 65%),
    radial-gradient(ellipse 50% 80% at 85% 20%, rgba(99, 102, 241, .1), transparent 65%);
}
.page-hero::after {
  content: '';
  position: absolute; inset: 0; z-index: -1;
  background-image:
    linear-gradient(rgba(255,255,255,.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.028) 1px, transparent 1px);
  background-size: 58px 58px;
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 20%, #000 20%, transparent 100%);
  mask-image: radial-gradient(ellipse 80% 70% at 50% 20%, #000 20%, transparent 100%);
}

.page-title {
  font-size: clamp(2rem, 5.5vw, 3.4rem);
  font-weight: 700;
  line-height: 1.06;
  margin-bottom: 1rem;
}
.page-lead {
  max-width: 62ch;
  font-size: clamp(1rem, 1.7vw, 1.1rem);
  color: var(--muted);
  margin: 0;
}

/* Pie compacto */
.page-footer {
  border-top: 1px solid var(--stroke);
  background: #03050a;
  padding: clamp(2.2rem, 5vw, 3rem) 0 5.5rem;
}
.page-footer-in {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 1.2rem;
  font-size: .85rem;
  color: var(--faint);
}
.page-footer-links { display: flex; flex-wrap: wrap; gap: 1.2rem; }
.page-footer-links a { transition: color .3s; }
.page-footer-links a:hover { color: var(--brand); }

/* ------------------------------------------------------ 2. AVISOS Y FICHAS */
.note {
  display: flex; align-items: flex-start; gap: .7rem;
  padding: 1rem 1.2rem;
  border-radius: var(--r);
  border: 1px solid;
  font-size: .9rem;
  margin-bottom: 1.6rem;
}
.note i { margin-top: .15rem; font-size: 1.1rem; flex: none; }
.note strong { display: block; margin-bottom: .15rem; }
.note-warn   { background: rgba(251,191,36,.07);  border-color: rgba(251,191,36,.28);  color: #fde68a; }
.note-danger { background: rgba(251,113,133,.07); border-color: rgba(251,113,133,.28); color: #fecdd3; }
.note-brand  { background: rgba(34,211,238,.06);  border-color: rgba(34,211,238,.25);  color: #a5edfb; }
.note-ok     { background: rgba(52,211,153,.06);  border-color: rgba(52,211,153,.25);  color: #a7f3d0; }

/* ------------------------------------------------- 3. PESTAÑAS (GUÍA) */
.tabs {
  display: flex; flex-wrap: wrap; gap: .5rem;
  padding: .4rem;
  margin-bottom: 2.4rem;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--stroke);
}
.tab {
  flex: 1 1 auto;
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .75rem 1.2rem;
  border-radius: 999px;
  font-size: .89rem; font-weight: 500;
  color: var(--muted);
  white-space: nowrap;
  transition: all .35s var(--ease);
}
.tab:hover { color: #fff; }
.tab[aria-selected="true"] {
  background: var(--grad);
  color: #04121a;
  font-weight: 600;
  box-shadow: 0 8px 22px rgba(34,211,238,.25);
}
.tab-panel[hidden] { display: none; }
.tab-panel { animation: faqIn .45s var(--ease); }

/* Pasos numerados */
.steps { display: grid; gap: 1.1rem; }
.step {
  position: relative;
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 1.2rem;
  padding: 1.4rem 1.5rem;
  border-radius: var(--r-lg);
  background: linear-gradient(165deg, rgba(255,255,255,.05), rgba(255,255,255,.018));
  border: 1px solid var(--stroke);
  transition: transform .4s var(--ease), border-color .4s;
}
.step:hover { transform: translateX(5px); border-color: rgba(34,211,238,.3); }
.step-num {
  width: 52px; height: 52px;
  display: grid; place-items: center;
  border-radius: 16px;
  background: var(--grad-soft);
  border: 1px solid rgba(34,211,238,.24);
  font-family: var(--head);
  font-size: 1.25rem; font-weight: 600;
  color: var(--brand);
}
.step h3 { font-size: 1.1rem; margin-bottom: .5rem; }
.step > div > p { margin: 0 0 .8rem; color: var(--muted); font-size: .92rem; }

.tick-list { list-style: none; display: grid; gap: .45rem; margin: 0; }
.tick-list li { display: flex; align-items: flex-start; gap: .55rem; font-size: .88rem; color: #c3cede; }
.tick-list i { color: var(--ok); font-size: .9rem; margin-top: .25rem; flex: none; }

/* Rejilla de herramientas del taller */
.tool-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(210px, 100%), 1fr)); gap: 1rem; }
.tool-item {
  text-align: center;
  padding: 1.6rem 1.2rem;
  border-radius: var(--r-lg);
  background: var(--surface);
  border: 1px solid var(--stroke);
  transition: transform .4s var(--ease), border-color .4s, box-shadow .4s;
}
.tool-item:hover { transform: translateY(-6px); border-color: rgba(34,211,238,.35); box-shadow: var(--sh); }
.tool-item i {
  display: grid; place-items: center;
  width: 54px; height: 54px;
  margin: 0 auto 1rem;
  border-radius: 17px;
  background: var(--grad-soft);
  color: var(--brand);
  font-size: 1.35rem;
}
.tool-item h3 { font-size: 1rem; margin-bottom: .4rem; }
.tool-item p { margin: 0; font-size: .84rem; color: var(--muted); }

/* Problemas comunes */
.problem {
  margin-bottom: 1.2rem;
  border-radius: var(--r-lg);
  background: var(--surface);
  border: 1px solid var(--stroke);
  overflow: hidden;
}
.problem-head {
  display: flex; align-items: center; gap: .9rem;
  padding: 1.2rem 1.4rem;
  border-bottom: 1px solid var(--stroke);
}
.problem-head i {
  width: 42px; height: 42px; flex: none;
  display: grid; place-items: center;
  border-radius: 13px;
  background: rgba(251,113,133,.12);
  color: var(--danger);
  font-size: 1.1rem;
}
.problem-head h3 { font-size: 1.08rem; }
.problem-body { padding: 1.3rem 1.4rem; }
.problem-body > p { margin: 0 0 1rem; font-size: .9rem; color: var(--muted); }
.problem-body h4 {
  display: flex; align-items: center; gap: .5rem;
  font-size: .92rem; color: var(--brand);
  margin-bottom: .9rem;
}
.solution-steps { counter-reset: s; list-style: none; display: grid; gap: .55rem; }
.solution-steps li {
  counter-increment: s;
  display: flex; align-items: flex-start; gap: .8rem;
  font-size: .88rem; color: #c3cede;
}
.solution-steps li::before {
  content: counter(s, decimal-leading-zero);
  flex: none;
  width: 28px; height: 28px;
  display: grid; place-items: center;
  border-radius: 9px;
  background: var(--grad-soft);
  border: 1px solid rgba(34,211,238,.2);
  font-family: var(--mono); font-size: .72rem;
  color: var(--brand);
}

/* --------------------------------------------------- 4. FORMULARIOS DE CÁLCULO */
.calc {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 1.6rem;
  align-items: start;
}
.calc-panel {
  padding: clamp(1.3rem, 3vw, 2rem);
  border-radius: var(--r-lg);
  background: linear-gradient(165deg, rgba(255,255,255,.055), rgba(255,255,255,.02));
  border: 1px solid var(--stroke);
}
.calc-panel h2, .calc-panel h3 {
  display: flex; align-items: center; gap: .6rem;
  font-size: 1.15rem;
  padding-bottom: 1rem;
  margin-bottom: 1.4rem;
  border-bottom: 1px solid var(--stroke);
}
.calc-panel h2 i, .calc-panel h3 i { color: var(--brand); }

.calc-field { margin-bottom: 1.2rem; }
.calc-field label {
  display: flex; align-items: center; gap: .45rem;
  font-size: .85rem; font-weight: 500;
  color: #c3cede;
  margin-bottom: .5rem;
}
.calc-field label i { color: var(--brand); font-size: .9rem; }
.calc-field .hint { display: block; font-size: .76rem; color: var(--faint); margin-top: .35rem; }

.calc-input {
  width: 100%;
  padding: .8rem .95rem;
  border-radius: var(--r-sm);
  background: rgba(255,255,255,.03);
  border: 1px solid var(--stroke);
  color: var(--text);
  font-size: .95rem;
  outline: none;
  transition: border-color .3s, background .3s, box-shadow .3s;
}
.calc-input:focus {
  border-color: var(--brand);
  background: rgba(34,211,238,.04);
  box-shadow: 0 0 0 3px rgba(34,211,238,.1);
}
.calc-input.invalid { border-color: var(--danger); }
select.calc-input { appearance: none; cursor: pointer; }
select.calc-input option { background: #0b1120; color: var(--text); }

/* Deslizador de altura */
.range-row { display: flex; align-items: center; gap: 1rem; }
input[type="range"].calc-range {
  flex: 1;
  -webkit-appearance: none; appearance: none;
  height: 5px;
  border-radius: 99px;
  background: var(--stroke-strong);
  outline: none;
  padding: 0;
}
input[type="range"].calc-range::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--grad);
  border: 2px solid #0b1120;
  cursor: pointer;
  box-shadow: 0 0 0 3px rgba(34,211,238,.18);
}
input[type="range"].calc-range::-moz-range-thumb {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: #22d3ee;
  border: 2px solid #0b1120;
  cursor: pointer;
}
.range-value {
  min-width: 62px;
  padding: .35rem .6rem;
  text-align: center;
  border-radius: 8px;
  background: var(--grad-soft);
  border: 1px solid rgba(34,211,238,.22);
  font-family: var(--mono); font-size: .85rem;
  color: var(--brand);
}

/* Interruptores */
.switch-row {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: .9rem 1rem;
  border-radius: var(--r-sm);
  background: var(--surface);
  border: 1px solid var(--stroke);
  margin-bottom: .8rem;
}
.switch-row .txt b { display: block; font-size: .88rem; }
.switch-row .txt small { font-size: .78rem; color: var(--faint); }
.switch { position: relative; flex: none; width: 50px; height: 28px; }
.switch input { position: absolute; opacity: 0; width: 100%; height: 100%; margin: 0; cursor: pointer; z-index: 2; }
.switch .track {
  position: absolute; inset: 0;
  border-radius: 99px;
  background: var(--stroke-strong);
  transition: background .3s var(--ease);
}
.switch .track::before {
  content: '';
  position: absolute; top: 3px; left: 3px;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: #fff;
  transition: transform .3s var(--ease);
}
.switch input:checked + .track { background: var(--grad); }
.switch input:checked + .track::before { transform: translateX(22px); }
.switch input:focus-visible + .track { box-shadow: 0 0 0 3px rgba(34,211,238,.3); }

/* Resultados */
.result-hero {
  text-align: center;
  padding: 1.8rem 1.2rem;
  border-radius: var(--r-lg);
  background: var(--grad-soft);
  border: 1px solid rgba(34,211,238,.22);
  margin-bottom: 1.4rem;
}
.result-hero b {
  display: block;
  font-family: var(--head);
  font-size: clamp(2.2rem, 6vw, 3.2rem);
  font-weight: 700;
  line-height: 1;
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.result-hero span {
  display: block;
  margin-top: .5rem;
  font-family: var(--mono);
  font-size: .74rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--faint);
}

.result-list { display: grid; gap: .6rem; }
.result-row {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: .85rem 1rem;
  border-radius: var(--r-sm);
  background: var(--surface);
  border: 1px solid var(--stroke);
}
.result-row .k { display: flex; align-items: center; gap: .5rem; font-size: .87rem; color: var(--muted); }
.result-row .k i { color: var(--brand); }
.result-row .v { font-family: var(--mono); font-size: 1rem; font-weight: 500; color: #fff; }

.result-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(140px, 100%), 1fr)); gap: .8rem; }
.result-card {
  text-align: center;
  padding: 1.1rem .8rem;
  border-radius: var(--r);
  background: var(--surface);
  border: 1px solid var(--stroke);
}
.result-card i { color: var(--brand); font-size: 1.2rem; }
.result-card b { display: block; font-family: var(--head); font-size: 1.3rem; margin: .45rem 0 .2rem; }
.result-card span { font-size: .76rem; color: var(--faint); }

/* Equipos recomendados */
.equip-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(170px, 100%), 1fr)); gap: .9rem; }
.equip {
  position: relative;
  text-align: center;
  padding: 1.2rem 1rem;
  border-radius: var(--r);
  background: var(--surface);
  border: 1px solid var(--stroke);
  transition: transform .35s var(--ease), border-color .35s;
}
.equip:hover { transform: translateY(-4px); }
.equip.best { border-color: rgba(52,211,153,.45); background: rgba(52,211,153,.06); }
.equip-btu { font-family: var(--head); font-size: 1.35rem; font-weight: 600; color: #fff; }
.equip dl { display: grid; gap: .25rem; margin: .7rem 0 0; font-size: .8rem; color: var(--muted); }
.equip-badge {
  position: absolute; top: -10px; left: 50%;
  transform: translateX(-50%);
  padding: .22rem .7rem;
  border-radius: 999px;
  background: linear-gradient(135deg, #34d399, #10b981);
  color: #04140a;
  font-size: .68rem; font-weight: 700;
  letter-spacing: .06em; text-transform: uppercase;
  white-space: nowrap;
}

/* Aviso de validación */
.calc-msg {
  display: none;
  align-items: center; gap: .55rem;
  margin-top: 1rem;
  padding: .8rem 1rem;
  border-radius: var(--r-sm);
  background: rgba(251,113,133,.1);
  border: 1px solid rgba(251,113,133,.3);
  color: #fecdd3;
  font-size: .86rem;
}
.calc-msg.on { display: flex; }

/* --------------------------------------------------------- 5. RECURSOS */
.res-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(280px, 100%), 1fr)); gap: 1.3rem; }

.res-card {
  display: flex; flex-direction: column;
  padding: 1.5rem;
  border-radius: var(--r-lg);
  background: linear-gradient(165deg, rgba(255,255,255,.05), rgba(255,255,255,.018));
  border: 1px solid var(--stroke);
  transition: transform .45s var(--ease), border-color .45s, box-shadow .45s;
}
.res-card:hover { transform: translateY(-7px); border-color: rgba(34,211,238,.35); box-shadow: var(--sh-lg); }
.res-icon {
  width: 50px; height: 50px;
  display: grid; place-items: center;
  border-radius: 16px;
  background: var(--grad-soft);
  border: 1px solid rgba(34,211,238,.22);
  color: var(--brand);
  font-size: 1.3rem;
  margin-bottom: 1rem;
}
.res-icon.pdf { background: rgba(251,113,133,.12); border-color: rgba(251,113,133,.26); color: var(--danger); }
.res-card h3 { font-size: 1.08rem; margin-bottom: .5rem; }
.res-card p { flex: 1; margin: 0 0 1.2rem; font-size: .89rem; color: var(--muted); }
.res-meta {
  display: flex; align-items: center; justify-content: space-between; gap: .6rem;
  padding-top: 1rem;
  border-top: 1px solid var(--stroke);
}
.res-tag {
  padding: .28rem .75rem;
  border-radius: 999px;
  background: var(--surface-2);
  font-family: var(--mono); font-size: .7rem;
  letter-spacing: .06em; text-transform: uppercase;
  color: var(--faint);
}

/* Vídeos */
.video-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(300px, 100%), 1fr)); gap: 1.3rem; }
.video-card {
  border-radius: var(--r-lg);
  background: var(--surface);
  border: 1px solid var(--stroke);
  overflow: hidden;
  transition: transform .45s var(--ease), border-color .45s;
}
.video-card:hover { transform: translateY(-5px); border-color: rgba(34,211,238,.3); }
.video-frame { position: relative; aspect-ratio: 16 / 9; background: #05070d; }
.video-frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.video-body { padding: 1.1rem 1.2rem 1.3rem; }
.video-body h3 { display: flex; align-items: center; gap: .5rem; font-size: 1rem; margin-bottom: .5rem; }
.video-body h3 i { color: var(--brand); }
.video-body p { margin: 0 0 1rem; font-size: .85rem; color: var(--muted); }
.video-meta { display: flex; align-items: center; justify-content: space-between; gap: .6rem; font-size: .78rem; color: var(--faint); }
.video-meta time { display: inline-flex; align-items: center; gap: .35rem; }

/* ------------------------------------------------------- 6. RESPONSIVE */
/* Los hijos de flex no bajan de su ancho mínimo de contenido si no se les
   permite explícitamente; sin esto los paneles desbordan en pantallas de 320px. */
.calc > *, .switch-row, .switch-row .txt, .range-row, .result-row, .result-row .k { min-width: 0; }
.switch-row .txt small { display: block; }
.result-row .k { flex: 1; }
.result-row .v { white-space: nowrap; }

@media (max-width: 900px) {
  .calc { grid-template-columns: 1fr; }
  .tabs { border-radius: var(--r-lg); }
  .tab { flex: 1 1 45%; }
}

@media (max-width: 380px) {
  .range-row { flex-wrap: wrap; }
  .range-value { width: 100%; }
  .result-row { flex-wrap: wrap; row-gap: .25rem; }
}

@media (max-width: 600px) {
  .step { grid-template-columns: 1fr; gap: .9rem; }
  .step-num { width: 44px; height: 44px; font-size: 1.05rem; }
  .tab { flex: 1 1 100%; }
  .page-footer-in { flex-direction: column; align-items: flex-start; }
  .back-link { padding: .6rem 1rem; }

  /* La marca más el enlace de vuelta más el botón no caben en una línea.
     El botón de contacto es redundante aquí: el flotante de WhatsApp está
     siempre visible y la portada tiene su propia sección de contacto. */
  .page-nav-actions .btn-primary { display: none; }
  .page-nav-in { gap: .6rem; }
  .brand-copy { min-width: 0; }
}

@media (max-width: 380px) {
  /* Último recurso: sólo la flecha */
  .back-link { padding: .6rem .8rem; font-size: 0; gap: 0; }
  .back-link i { font-size: 1rem; }
}