/* =========================================================
   Cuentas Hogar — styles.css
   Vanilla CSS, sin frameworks.
   ========================================================= */

/* -----------------------------
   Tokens
------------------------------ */
:root {
  --color-bg: #f5f8f6;
  --color-bg-alt: #eef3f0;
  --color-surface: #ffffff;

  --color-text: #16233a;
  --color-text-soft: #4a5568;
  --color-text-faint: #7c8a97;

  --color-primary: #1f7a5c;
  --color-primary-dark: #16593f;
  --color-primary-tint: #e3f2eb;

  --color-border: #dde3df;
  --color-border-strong: #c3ccc6;

  --color-focus: #1266f1;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;

  --radius-s: 10px;
  --radius-m: 16px;
  --radius-full: 999px;

  --container: 1180px;
  --gap: clamp(1.25rem, 1rem + 1vw, 2rem);

  --shadow-sm: 0 1px 2px rgba(22, 35, 58, 0.05), 0 6px 18px -10px rgba(22, 35, 58, 0.12);
  --shadow-md: 0 4px 10px rgba(22, 35, 58, 0.06), 0 18px 34px -16px rgba(22, 35, 58, 0.2);

  --transition: 160ms ease;
}

/* -----------------------------
   Reset
------------------------------ */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: inherit; }

ul { list-style: none; margin: 0; padding: 0; }

h1, h2, h3, p { margin: 0; }

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
  background: none;
  border: none;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  position: fixed;
  top: -48px;
  left: 1rem;
  z-index: 1000;
  background: var(--color-text);
  color: #fff;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-s);
  transition: top var(--transition);
}

.skip-link:focus { top: 1rem; }

/* -----------------------------
   Layout helpers
------------------------------ */
.container {
  width: min(100% - 2.5rem, var(--container));
  margin-inline: auto;
}

.section {
  padding-block: clamp(3rem, 2.2rem + 3vw, 5.5rem);
}

.section-alt {
  background: var(--color-bg-alt);
}

.section h2 {
  font-size: clamp(1.6rem, 1.4rem + 1vw, 2.25rem);
  letter-spacing: -0.01em;
  text-align: center;
  margin-bottom: clamp(2rem, 1.6rem + 1.5vw, 3rem);
}

/* -----------------------------
   Botones
------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.5rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background var(--transition), color var(--transition),
    border-color var(--transition), transform var(--transition);
}

.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}

.btn-primary:hover { background: var(--color-primary-dark); }

.btn-outline {
  background: transparent;
  border-color: var(--color-border-strong);
  color: var(--color-text);
}

.btn-outline:hover { border-color: var(--color-primary); color: var(--color-primary-dark); }

.btn-disabled {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.5rem;
  border-radius: var(--radius-full);
  background: var(--color-bg-alt);
  color: var(--color-text-faint);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px dashed var(--color-border-strong);
  cursor: not-allowed;
}

.btn-sm { padding: 0.6rem 1.2rem; font-size: 0.9rem; }
.btn-lg { padding: 1rem 2rem; font-size: 1.05rem; }

/* -----------------------------
   Header
------------------------------ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(245, 248, 246, 0.9);
  backdrop-filter: saturate(150%) blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 72px;
}

.logo {
  font-weight: 800;
  font-size: 1.2rem;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--color-text);
}

.logo span { color: var(--color-primary); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-s);
  align-items: center;
}

.nav-toggle-bar {
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: clamp(1.25rem, 1rem + 1vw, 2.25rem);
}

.main-nav ul {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 0.8rem + 1vw, 1.75rem);
}

.main-nav a:not(.btn) {
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text-soft);
  padding: 0.3rem 0.1rem;
}

.main-nav a:not(.btn):hover,
.main-nav a[aria-current="page"] {
  color: var(--color-text);
}

@media (max-width: 860px) {
  .nav-toggle { display: inline-flex; }

  .main-nav {
    position: fixed;
    inset: 72px 0 0 0;
    background: var(--color-bg);
    flex-direction: column;
    align-items: stretch;
    padding: 1.5rem;
    gap: 1.5rem;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  }

  .main-nav.is-open {
    opacity: 1;
    transform: translateY(0);
    visibility: visible;
  }

  .main-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 0.25rem;
  }

  .main-nav a:not(.btn) {
    display: block;
    padding: 0.9rem 0.5rem;
    border-bottom: 1px solid var(--color-border);
    font-size: 1.05rem;
  }

  .nav-cta { justify-content: center; }
}

/* -----------------------------
   Hero
------------------------------ */
.hero {
  padding-block: clamp(3rem, 2.2rem + 3vw, 5.5rem);
}

.hero-inner {
  display: flex;
  align-items: center;
  gap: clamp(2rem, 1.5rem + 2vw, 4rem);
  flex-wrap: wrap;
}

.hero-copy {
  flex: 1 1 420px;
  max-width: 620px;
}

.hero-copy h1 {
  font-size: clamp(2.1rem, 1.7rem + 2vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--color-text);
}

.hero-lede {
  margin-top: 1.2rem;
  font-size: 1.1rem;
  color: var(--color-text-soft);
  max-width: 46ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 2rem;
}

.hero-visual {
  flex: 1 1 320px;
  display: flex;
  justify-content: center;
}

.hero-visual-card {
  width: 100%;
  max-width: 360px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-m);
  box-shadow: var(--shadow-md);
  padding: clamp(1.5rem, 1.2rem + 1vw, 2.25rem);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.hero-ring {
  width: 150px;
  height: 150px;
  border-radius: var(--radius-full);
  background: conic-gradient(var(--color-primary) 0% 68%, var(--color-primary-tint) 68% 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-ring-inner {
  width: 110px;
  height: 110px;
  border-radius: var(--radius-full);
  background: var(--color-surface);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.15rem;
}

.hero-ring-value {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--color-primary-dark);
}

.hero-ring-label {
  font-size: 0.7rem;
  color: var(--color-text-faint);
  text-align: center;
  max-width: 8ch;
}

.hero-bars {
  width: 100%;
  height: 70px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 0.6rem;
}

.hero-bar {
  width: 18px;
  border-radius: 6px 6px 0 0;
  background: var(--color-primary-tint);
}

.hero-bar-accent {
  background: var(--color-primary);
}

.hero-visual-caption {
  font-size: 0.85rem;
  color: var(--color-text-faint);
  text-align: center;
}

/* -----------------------------
   Tarjetas (calculadoras y guías)
------------------------------ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap);
}

@media (max-width: 1040px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 560px) {
  .card-grid { grid-template-columns: 1fr; }
}

.calc-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-m);
  padding: clamp(1.5rem, 1.3rem + 0.6vw, 2rem);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  transition: box-shadow var(--transition), transform var(--transition);
}

.calc-card:hover,
.calc-card:focus-within {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.calc-card.is-soon {
  opacity: 0.92;
}

.calc-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: var(--radius-full);
  background: var(--color-primary-tint);
  color: var(--color-primary-dark);
  font-weight: 800;
  font-size: 0.85rem;
  letter-spacing: -0.01em;
}

.calc-card h3 {
  font-size: 1.15rem;
  color: var(--color-text);
}

.calc-card p {
  color: var(--color-text-soft);
  font-size: 0.95rem;
  flex-grow: 1;
}

.calc-card .btn {
  align-self: flex-start;
  margin-top: 0.3rem;
}

/* -----------------------------
   Beneficios
------------------------------ */
.benefit-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
}

@media (max-width: 760px) {
  .benefit-grid { grid-template-columns: 1fr; }
}

.benefit-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-m);
  padding: clamp(1.5rem, 1.3rem + 0.6vw, 2rem);
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.benefit-item h3 {
  font-size: 1.2rem;
  color: var(--color-primary-dark);
  margin-bottom: 0.5rem;
}

.benefit-item p {
  color: var(--color-text-soft);
}

/* -----------------------------
   Guías
------------------------------ */
.guide-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-m);
  padding: clamp(1.5rem, 1.3rem + 0.6vw, 2rem);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.guide-tag {
  align-self: flex-start;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary-dark);
  background: var(--color-primary-tint);
  padding: 0.3rem 0.7rem;
  border-radius: var(--radius-full);
}

.guide-card h3 {
  font-size: 1.1rem;
  color: var(--color-text);
}

.guide-card p {
  color: var(--color-text-soft);
  font-size: 0.95rem;
}

/* -----------------------------
   CTA final
------------------------------ */
.cta-band {
  padding-block: clamp(3rem, 2.2rem + 2.5vw, 4.5rem);
  background: var(--color-primary);
}

.cta-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1.75rem;
}

.cta-band h2 {
  color: #fff;
  max-width: 26ch;
  font-size: clamp(1.5rem, 1.3rem + 1vw, 2.1rem);
}

.cta-band .btn-primary {
  background: #fff;
  color: var(--color-primary-dark);
}

.cta-band .btn-primary:hover {
  background: var(--color-primary-tint);
}

/* -----------------------------
   Footer
------------------------------ */
.site-footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding-block: clamp(2rem, 1.6rem + 1.5vw, 3rem);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
}

.footer-brand {
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--color-text);
}

.footer-brand span { color: var(--color-primary); }

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.footer-nav a {
  text-decoration: none;
  font-size: 0.9rem;
  color: var(--color-text-soft);
}

.footer-nav a:hover { color: var(--color-primary-dark); }

.footer-copy {
  font-size: 0.85rem;
  color: var(--color-text-faint);
  width: 100%;
  text-align: center;
  order: 3;
  margin-top: 0.5rem;
}

@media (min-width: 761px) {
  .footer-copy {
    width: auto;
    text-align: right;
    order: 0;
    margin-top: 0;
  }
}


/* =========================================================
   Cuentas Hogar — estilos adicionales para
   calculadoras/pintura.html
   Añadir AL FINAL de styles.css. Complementa los estilos ya
   añadidos para calculadoras/consumo-electrico.html
   (breadcrumb, page-intro, calc-tool-grid, calc-panel,
   form-group, form-hint, field-error, form-actions,
   result-group, result-grid, result-item, formula-note,
   prose, faq-item...). Solo reglas nuevas, sin duplicar nada.
   ========================================================= */

/* Selects dentro del formulario de calculadora */
.form-group select {
  width: 100%;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-s);
  background: var(--color-bg);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color var(--transition), background var(--transition);
}

.form-group select:focus {
  border-color: var(--color-primary);
  background: var(--color-surface);
}

/* Subtítulo para agrupar campos opcionales dentro del formulario */
.field-group-title {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 700;
  color: var(--color-text-faint);
  margin: 1.5rem 0 0.75rem;
}

.field-group-title:first-of-type {
  margin-top: 0.5rem;
}

/* Bloque de resultado destacado (total en litros) */
.result-total {
  margin-top: 1.5rem;
  padding: 1.25rem;
  border-radius: var(--radius-m);
  background: var(--color-primary-tint);
  border: 1px solid var(--color-primary);
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.result-total-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary-dark);
  font-weight: 700;
}

.result-total-value {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--color-primary-dark);
}

/* Consejo de compra bajo el resultado destacado */
.purchase-tip {
  margin-top: 1rem;
  font-size: 0.9rem;
  color: var(--color-text-soft);
  background: var(--color-bg-alt);
  border-radius: var(--radius-s);
  padding: 0.9rem 1rem;
}

/* Utilidad de accesibilidad (por si tu styles.css no la incluye ya) */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}


/* =========================================================
   Cuentas Hogar — estilos adicionales para
   calculadoras/metros-cuadrados.html
   Añadir AL FINAL de styles.css. Solo una regla nueva:
   el resto reutiliza clases ya existentes de
   consumo-electrico.html y pintura.html
   (page-intro, breadcrumb, calc-tool-grid, calc-panel,
   form-group, form-hint, field-error, form-actions,
   result-group, result-grid, result-item, result-total,
   result-total-label, result-total-value, formula-note,
   prose, faq-item, card-grid, calc-card, calc-badge,
   btn-disabled, cta-band...).
   ========================================================= */

/* Texto "(opcional)" en línea junto a una etiqueta de campo */
.form-hint-inline {
  font-weight: 400;
  color: var(--color-text-faint);
  font-size: 0.85em;
}