/* ==========================================================================
   VATIOFY — Calculadora de consumo eléctrico
   Design tokens
   ========================================================================== */
:root{
  --ink: #16232F;
  --ink-soft: #24384A;
  --paper: #FAF6EE;
  --paper-dim: #F0E9DA;
  --copper: #C1703F;
  --copper-dark: #9C5730;
  --teal: #2F6F68;
  --teal-light: #6FBDB2;
  --brass: #D9A441;
  --ash: #5B6B76;
  --white: #FFFFFF;
  --line: rgba(22,35,47,0.12);
  --font-display: 'Space Grotesk', 'Segoe UI', sans-serif;
  --font-body: 'Inter', 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow-soft: 0 12px 32px rgba(22,35,47,0.10);
  --shadow-lift: 0 20px 48px rgba(22,35,47,0.16);
  --max-width: 1180px;
}

*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *{ animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

body{
  margin:0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1,h2,h3,h4{ font-family: var(--font-display); font-weight:700; line-height:1.15; margin:0 0 .5em; color: var(--ink); }
h1{ font-size: clamp(2.1rem, 4vw, 3.1rem); }
h2{ font-size: clamp(1.6rem, 3vw, 2.3rem); }
h3{ font-size: 1.2rem; }
p{ margin:0 0 1em; color: var(--ink-soft); }
.wrap{ max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.sr-only{ position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; }

.skip-link{
  position:absolute; left:-9999px; top:0; background:var(--ink); color:var(--paper);
  padding: 10px 18px; z-index: 200; border-radius: 0 0 8px 0;
}
.skip-link:focus{ left:0; }

a{ color: var(--copper-dark); }
:focus-visible{ outline: 3px solid var(--brass); outline-offset: 2px; }

.eyebrow{
  font-family: var(--font-mono); text-transform: uppercase; letter-spacing: .12em;
  font-size: .78rem; color: var(--teal); margin-bottom: .6em; font-weight: 600;
}
.section-intro{ max-width: 640px; font-size: 1.05rem; }

/* Buttons */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:.5em;
  font-family: var(--font-body); font-weight:600; font-size:1rem;
  padding: 14px 26px; border-radius: 999px; border: 2px solid transparent;
  cursor:pointer; text-decoration:none; transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.btn-primary{ background: var(--copper); color: var(--white); box-shadow: var(--shadow-soft); }
.btn-primary:hover{ background: var(--copper-dark); transform: translateY(-2px); box-shadow: var(--shadow-lift); }
.btn-ghost{ background: transparent; border-color: var(--line); color: var(--ink); }
.btn-ghost:hover{ border-color: var(--copper); color: var(--copper-dark); }
.btn-text{ background:none; border:none; color: var(--ash); text-decoration: underline; font-weight:500; }
.btn-text:hover{ color: var(--copper-dark); }

/* ==========================================================================
   Header
   ========================================================================== */
.site-header{ background: var(--paper); border-bottom: 1px solid var(--line); position: sticky; top:0; z-index:100; }
.header-inner{ display:flex; align-items:center; justify-content:space-between; height: 72px; }
.logo{ display:flex; align-items:center; gap:.5em; text-decoration:none; color: var(--ink); font-family: var(--font-display); font-weight:700; font-size:1.25rem; }
.main-nav ul{ display:flex; gap: 2em; list-style:none; margin:0; padding:0; }
.main-nav a{ color: var(--ink-soft); text-decoration:none; font-weight:500; }
.main-nav a:hover{ color: var(--copper-dark); }
.nav-toggle{ display:none; background:none; border:none; cursor:pointer; padding:8px; }
.nav-toggle span{ display:block; width:24px; height:2px; background: var(--ink); margin:5px 0; }

/* Desplegable "Calculadoras" (details/summary, funciona sin JS) */
.nav-dropdown{ position:relative; }
.nav-dropdown summary{
  list-style:none; cursor:pointer; color: var(--ink-soft); font-weight:500;
  display:flex; align-items:center; gap:.3em;
}
.nav-dropdown summary::-webkit-details-marker{ display:none; }
.nav-dropdown summary::after{ content:"▾"; font-size:.7em; color: var(--ash); }
.nav-dropdown:hover summary, .nav-dropdown[open] summary{ color: var(--copper-dark); }
.dropdown-menu{
  list-style:none; margin:0; padding: 8px; display:flex; flex-direction:column; gap:2px;
  position:absolute; top: calc(100% + 10px); left:0; min-width: 220px;
  background: var(--white); border-radius: var(--radius-sm); box-shadow: var(--shadow-lift); border:1px solid var(--line);
  z-index: 50;
}
.dropdown-menu li{ padding:0; border:none; }
.dropdown-menu a{ display:block; padding: 8px 10px; border-radius: 6px; color: var(--ink-soft); text-decoration:none; font-weight:500; font-size:.95rem; }
.dropdown-menu a:hover{ background: var(--paper-dim); color: var(--copper-dark); }

@media (max-width: 780px){
  .dropdown-menu{ position:static; box-shadow:none; border:none; margin-top:4px; }
  .nav-dropdown summary{ padding: 4px 0; }
}

@media (max-width: 780px){
  .main-nav ul{ display:none; position:absolute; top:72px; left:0; right:0; background:var(--paper); flex-direction:column; gap:0; border-bottom:1px solid var(--line); padding: 8px 24px 16px; }
  .main-nav ul.open{ display:flex; }
  .main-nav ul li{ padding: 10px 0; border-top:1px solid var(--line); }
  .nav-toggle{ display:block; }
}

/* ==========================================================================
   Hero + Signature meter dial
   ========================================================================== */
.hero{ padding: 72px 0 40px; background: linear-gradient(180deg, var(--paper) 0%, var(--paper-dim) 100%); }
.hero-inner{ display:grid; grid-template-columns: 1.1fr .9fr; align-items:center; gap: 48px; }
.hero-note{ font-family: var(--font-mono); font-size:.82rem; color: var(--ash); margin-top: 1.2em; }
.hero-sub{ font-size: 1.15rem; max-width: 46ch; }

.meter-dial{ width: 100%; max-width: 340px; margin: 0 auto; display:block; }
.dial-ring-outer{ fill: var(--ink); }
.dial-ring-inner{ fill: var(--paper); stroke: var(--line); stroke-width:1; }
.dial-label{ font-family: var(--font-mono); font-size: 12px; letter-spacing: .14em; fill: var(--ash); }
.dial-value{ font-family: var(--font-mono); font-size: 34px; font-weight:600; fill: var(--teal); }
.dial-unit{ font-family: var(--font-mono); font-size: 12px; fill: var(--ash); }
.dial-needle{ stroke: var(--copper); stroke-width: 4; stroke-linecap: round; transform-origin: 160px 160px; transform: rotate(-40deg); transition: transform 1.1s cubic-bezier(.34,1.4,.6,1); }
.dial-hub{ fill: var(--copper-dark); }

/* ==========================================================================
   Ad slots
   ========================================================================== */
.ad-slot{
  display:flex; align-items:center; justify-content:center; text-align:center;
  border: 1px dashed var(--line); border-radius: var(--radius-sm);
  color: var(--ash); font-size: .82rem; font-family: var(--font-mono);
  background: var(--paper-dim); margin: 32px auto;
}
.ad-slot--leaderboard{ min-height: 90px; }
.ad-slot--sidebar{ min-height: 250px; margin-top: 32px; }
.ad-slot--infeed{ grid-column: 1 / -1; min-height: 120px; }

/* ==========================================================================
   Calculator
   ========================================================================== */
.calc-section{ padding: 64px 0; }
.calc-layout{ display:grid; grid-template-columns: 1.5fr 1fr; gap: 44px; align-items:start; }

.table-wrap{ overflow-x:auto; background: var(--white); border-radius: var(--radius); box-shadow: var(--shadow-soft); margin: 24px 0; }
table{ width:100%; border-collapse: collapse; min-width: 520px; }
th, td{ padding: 12px 14px; text-align:left; border-bottom: 1px solid var(--line); }
th{ font-family: var(--font-mono); font-size:.76rem; text-transform:uppercase; letter-spacing:.08em; color: var(--ash); }
td input{ width:100%; }
tbody tr:last-child td{ border-bottom:none; }

input[type="text"], input[type="number"]{
  font-family: var(--font-body); font-size: .95rem; padding: 8px 10px;
  border: 1.5px solid var(--line); border-radius: var(--radius-sm); background: var(--white); color: var(--ink);
  width: 100%;
}
input:focus{ border-color: var(--copper); }
input.input-error{ border-color: #B3492F; background: #FBEDE8; }

.row-remove{
  background:none; border:none; color: var(--ash); cursor:pointer; font-size:1.1rem; line-height:1;
  padding: 6px; border-radius: 50%;
}
.row-remove:hover{ color:#B3492F; background: #FBEDE8; }

#addRowBtn{ margin-top: 4px; }

.price-row{ margin-top: 28px; max-width: 360px; }
.price-row label{ display:block; font-weight:600; margin-bottom: .4em; }
.field-help{ font-size: .85rem; color: var(--ash); margin-top: .4em; }

/* Formularios verticales (calculadora solar, comparador de tarifas) */
.field-group{ margin-bottom: 22px; max-width: 420px; }
.field-group label{ display:block; font-weight:600; margin-bottom: .4em; }
.field-group input{ font-size: 1rem; padding: 10px 12px; }

/* Comparador de tarifas: dos columnas lado a lado */
.compare-columns{ display:grid; grid-template-columns: 1fr 1fr; gap: 32px; margin-top: 24px; }
.compare-columns h3{ font-family: var(--font-mono); text-transform:uppercase; letter-spacing:.06em; font-size:.85rem; color: var(--teal); margin-bottom:1em; }
@media (max-width: 700px){ .compare-columns{ grid-template-columns: 1fr; } }

.winner-banner{
  background: var(--teal); color: var(--white); border-radius: var(--radius-sm);
  padding: 14px 18px; font-weight:600; margin-bottom: 18px; text-align:center;
}

.form-error{
  margin-top: 18px; padding: 12px 16px; border-radius: var(--radius-sm);
  background: #FBEDE8; color: #8A3421; border: 1px solid #E3B7A6; font-weight:500;
}

.calc-actions{ display:flex; gap: 16px; align-items:center; margin-top: 28px; flex-wrap:wrap; }

/* Results panel styled like a digital meter readout */
.calc-results{ position: sticky; top: 96px; }
.meter-display{
  background: var(--ink); color: var(--paper); border-radius: var(--radius);
  padding: 28px; box-shadow: var(--shadow-lift);
}
.meter-display-label{ font-family: var(--font-mono); text-transform:uppercase; letter-spacing:.1em; font-size:.75rem; color: var(--teal-light); margin-bottom: .6em; }
.meter-readout{ display:flex; align-items:baseline; gap:.5em; border-bottom: 1px solid rgba(250,246,238,.15); padding-bottom: 16px; margin-bottom: 16px; }
.meter-readout span:first-child{ font-family: var(--font-mono); font-size: 2.6rem; font-weight:600; color: var(--teal-light); letter-spacing: .01em; }
.meter-readout-unit{ font-family: var(--font-mono); font-size: .85rem; color: var(--ash); }
.results-grid{ display:grid; grid-template-columns: 1fr 1fr; gap: 14px 20px; margin:0; }
.results-grid dt{ font-family: var(--font-mono); font-size: .72rem; text-transform:uppercase; letter-spacing:.06em; color: var(--ash); }
.results-grid dd{ margin:2px 0 0; font-family: var(--font-mono); font-size: 1.05rem; font-weight:600; color: var(--paper); }

.results-interpretation{ background: var(--white); border-radius: var(--radius); padding: 22px 24px; margin-top: 20px; box-shadow: var(--shadow-soft); }
.results-interpretation h3{ font-size: 1rem; }
.results-interpretation p{ font-size: .95rem; margin:0; }

/* ==========================================================================
   Explanation
   ========================================================================== */
.explain-section{ padding: 64px 0; background: var(--paper-dim); }
.explain-grid{ display:grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 32px; }
.explain-card{ background: var(--white); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow-soft); }
.formula{
  font-family: var(--font-mono); background: var(--ink); color: var(--teal-light);
  padding: 12px 14px; border-radius: var(--radius-sm); font-size: .95rem; overflow-x:auto;
}

/* ==========================================================================
   FAQ
   ========================================================================== */
.faq-section{ padding: 64px 0; }
.faq-list{ margin-top: 28px; max-width: 780px; }
.faq-item{
  border-bottom: 1px solid var(--line); padding: 18px 0;
}
.faq-item summary{
  font-weight:600; cursor:pointer; font-size: 1.02rem; list-style:none; position:relative; padding-right: 28px;
}
.faq-item summary::-webkit-details-marker{ display:none; }
.faq-item summary::after{
  content:"+"; position:absolute; right:0; top:0; font-family: var(--font-mono); color: var(--copper); font-size:1.3rem;
}
.faq-item[open] summary::after{ content:"−"; }
.faq-item p{ margin-top: 12px; font-size: .98rem; }

/* ==========================================================================
   Blog
   ========================================================================== */
.blog-section{ padding: 64px 0; background: var(--paper-dim); }
.blog-grid{ display:grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 32px; }
.blog-card{ background: var(--white); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow-soft); }
.blog-card h3 a{ color: var(--ink); text-decoration:none; }
.blog-card h3 a:hover{ color: var(--copper-dark); text-decoration:underline; }

/* Tarjetas de enlace a otras calculadoras (sección hub) */
.calc-hub-grid{ display:grid; grid-template-columns: repeat(3, 1fr); gap:20px; margin-top:28px; }
.calc-hub-card{
  display:block; background: var(--white); border-radius: var(--radius); padding: 22px;
  box-shadow: var(--shadow-soft); text-decoration:none; color: var(--ink); border: 2px solid transparent;
  transition: border-color .15s ease, transform .15s ease;
}
.calc-hub-card:hover{ border-color: var(--copper); transform: translateY(-2px); }
.calc-hub-card h3{ font-size:1.05rem; margin-bottom:.3em; }
.calc-hub-card p{ font-size:.92rem; margin:0; }
.calc-hub-card .hub-cta{ display:inline-block; margin-top:.8em; font-family:var(--font-mono); font-size:.8rem; color: var(--copper-dark); font-weight:600; }
@media (max-width: 780px){ .calc-hub-grid{ grid-template-columns: 1fr; } }
.blog-meta code{ font-family: var(--font-mono); font-size: .78rem; color: var(--teal); background: var(--paper-dim); padding: 3px 8px; border-radius: 6px; }
.blog-keywords{ font-size: .82rem; color: var(--ash); margin:0; }

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer{ background: var(--ink); color: var(--paper-dim); padding: 56px 0 0; }
.footer-inner{ display:grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 32px; padding-bottom: 40px; }
.logo-text{ font-family: var(--font-display); font-weight:700; font-size: 1.3rem; color: var(--paper); }
.footer-brand p{ color: rgba(250,246,238,.65); max-width: 32ch; }
.footer-links h4{ font-family: var(--font-mono); text-transform:uppercase; letter-spacing:.08em; font-size:.78rem; color: var(--teal-light); margin-bottom: 1em; }
.footer-links ul{ list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap: .7em; }
.footer-links a{ color: rgba(250,246,238,.8); text-decoration:none; }
.footer-links a:hover{ color: var(--brass); }
.footer-bottom{ border-top: 1px solid rgba(250,246,238,.12); padding: 20px 24px; font-size:.85rem; color: rgba(250,246,238,.55); }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 960px){
  .hero-inner{ grid-template-columns: 1fr; }
  .hero-visual{ order:-1; max-width: 280px; margin: 0 auto; }
  .calc-layout{ grid-template-columns: 1fr; }
  .calc-results{ position:static; }
  .explain-grid, .blog-grid{ grid-template-columns: 1fr 1fr; }
  .footer-inner{ grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px){
  .explain-grid, .blog-grid, .footer-inner{ grid-template-columns: 1fr; }
  .results-grid{ grid-template-columns: 1fr 1fr; }
  .calc-actions{ flex-direction:column; align-items:stretch; }
  .btn{ width:100%; }
}