/* =========================================================
   Calculadora Hogar — styles.css
   Sitio estático · HTML/CSS/JS vanilla · sin frameworks
   Concepto visual: "cuaderno de medidas" — trazos de plano,
   marcas de esquina y cifras en monoespaciada, sobre una
   base neutra cálida. El acento verde remite a eficiencia
   energética; el cobre, a instalaciones y calor.
   ========================================================= */

/* -----------------------------
   1. Tokens
------------------------------ */
:root {
  /* Color */
  --color-bg: #f5f6f2;
  --color-bg-alt: #ebede6;
  --color-surface: #ffffff;
  --color-ink: #16232a;
  --color-ink-soft: #46545a;
  --color-ink-faint: #7c8a87;
  --color-line: #d8dcd2;
  --color-line-strong: #b9c0b4;

  --color-primary: #2b6e5e;
  --color-primary-dark: #1e4e42;
  --color-primary-tint: #e4efe9;

  --color-accent: #c4622d;
  --color-accent-dark: #9c4c22;
  --color-accent-tint: #f6e6da;

  --color-focus: #1266f1;

  /* Tipografía */
  --font-sans:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, sans-serif;
  --font-mono:
    ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono",
    monospace;

  --step--1: clamp(0.8rem, 0.78rem + 0.1vw, 0.875rem);
  --step-0: clamp(1rem, 0.97rem + 0.15vw, 1.0625rem);
  --step-1: clamp(1.15rem, 1.08rem + 0.35vw, 1.375rem);
  --step-2: clamp(1.45rem, 1.3rem + 0.75vw, 1.9rem);
  --step-3: clamp(1.9rem, 1.6rem + 1.5vw, 2.75rem);
  --step-4: clamp(2.3rem, 1.9rem + 2vw, 3.4rem);

  /* Layout */
  --container: 1180px;
  --radius-s: 6px;
  --radius-m: 12px;
  --gap: clamp(1.25rem, 1rem + 1vw, 2rem);
  --header-h: 68px;

  --shadow-card: 0 1px 2px rgba(22, 35, 42, 0.06), 0 8px 24px -12px rgba(22, 35, 42, 0.18);
  --shadow-card-hover: 0 2px 4px rgba(22, 35, 42, 0.08), 0 16px 32px -14px rgba(22, 35, 42, 0.26);

  --transition: 160ms ease;
}

/* -----------------------------
   2. Reset básico
------------------------------ */
*,
*::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-ink);
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
}

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

h1,
h2,
h3,
h4,
p,
figure {
  margin: 0;
}

button,
input,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

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

.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;
}

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

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

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary-dark);
}

.eyebrow::before {
  content: "";
  width: 1.4em;
  height: 1px;
  background: var(--color-accent);
}

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

/* -----------------------------
   4. Cabecera / navegación
------------------------------ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: rgba(245, 246, 242, 0.92);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--color-line);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 800;
  font-size: var(--step-0);
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--color-ink);
}

.brand-mark {
  width: 32px;
  height: 32px;
  flex: none;
  color: var(--color-primary);
}

.brand-name-alt {
  color: var(--color-accent);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  background: transparent;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-s);
}

.nav-toggle svg {
  width: 22px;
  height: 22px;
}

.main-nav {
  display: flex;
}

.main-nav ul {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 0.7rem + 1vw, 2rem);
}

.main-nav a {
  position: relative;
  text-decoration: none;
  font-weight: 600;
  font-size: var(--step--1);
  color: var(--color-ink-soft);
  padding: 0.35rem 0.1rem;
}

.main-nav a:hover,
.main-nav a[aria-current="page"] {
  color: var(--color-ink);
}

.main-nav a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 2px;
  background: var(--color-accent);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  padding: 0.55rem 1rem;
  border-radius: var(--radius-s);
  background: var(--color-primary);
  color: #fff !important;
  font-weight: 700;
}

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

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

  .main-nav {
    position: fixed;
    inset: var(--header-h) 0 0 0;
    background: var(--color-bg);
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    transform: translateX(100%);
    transition: transform var(--transition);
    visibility: hidden;
  }

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

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

  .main-nav a {
    display: block;
    padding: 0.9rem 0.5rem;
    border-bottom: 1px solid var(--color-line);
    font-size: var(--step-0);
  }

  .nav-cta {
    margin-top: 0.75rem;
    justify-content: center;
  }
}

/* -----------------------------
   5. Hero
------------------------------ */
.hero {
  padding-block: clamp(2.5rem, 2rem + 2.5vw, 5rem);
  border-bottom: 1px solid var(--color-line);
  background:
    linear-gradient(var(--color-bg-alt), var(--color-bg-alt)) bottom / 100% 1px no-repeat,
    var(--color-bg);
}

.hero .container {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(2rem, 1.5rem + 2vw, 4rem);
  align-items: center;
}

.hero-title {
  font-size: var(--step-4);
  line-height: 1.04;
  letter-spacing: -0.02em;
  font-weight: 800;
}

.hero-title em {
  font-style: normal;
  color: var(--color-primary);
}

.hero-lede {
  margin-top: 1.1rem;
  max-width: 46ch;
  font-size: var(--step-1);
  color: var(--color-ink-soft);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 1.75rem;
}

.hero-stats {
  display: flex;
  gap: clamp(1.25rem, 1rem + 1vw, 2.25rem);
  margin-top: 2.25rem;
  padding-top: 1.5rem;
  border-top: 1px dashed var(--color-line-strong);
}

.hero-stat b {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--step-2);
  color: var(--color-ink);
}

.hero-stat span {
  font-size: var(--step--1);
  color: var(--color-ink-faint);
}

.hero-art {
  color: var(--color-primary);
  position: relative;
  padding: 1.5rem;
}

.hero-art svg {
  width: 100%;
  height: auto;
}

@media (max-width: 860px) {
  .hero .container {
    grid-template-columns: 1fr;
  }

  .hero-art {
    order: -1;
    max-width: 360px;
    margin-inline: auto;
  }
}

/* -----------------------------
   6. Botones
------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.4rem;
  border-radius: var(--radius-s);
  font-weight: 700;
  font-size: var(--step--1);
  text-decoration: none;
  border: 1px solid transparent;
  transition: background var(--transition), border-color var(--transition), 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-ghost {
  background: transparent;
  border-color: var(--color-line-strong);
  color: var(--color-ink);
}

.btn-ghost:hover {
  border-color: var(--color-ink);
}

.btn-block {
  width: 100%;
}

.btn-sm {
  padding: 0.55rem 0.9rem;
  font-size: var(--step--1);
}

/* -----------------------------
   7. Secciones genéricas
------------------------------ */
.section {
  padding-block: clamp(2.5rem, 2rem + 2.5vw, 4.5rem);
}

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

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 1.5rem;
  margin-bottom: clamp(1.5rem, 1.2rem + 1.2vw, 2.5rem);
}

.section-head h2 {
  margin-top: 0.5rem;
  font-size: var(--step-3);
  letter-spacing: -0.015em;
  max-width: 20ch;
}

.section-head p {
  max-width: 40ch;
  color: var(--color-ink-soft);
}

/* -----------------------------
   8. Tarjetas de calculadoras
------------------------------ */
.calc-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap);
}

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

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

.calc-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  padding: 1.6rem 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-m);
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}

.calc-card::before,
.calc-card::after {
  content: "";
  position: absolute;
  width: 10px;
  height: 10px;
  border: 1px solid var(--color-line-strong);
  opacity: 0;
  transition: opacity var(--transition);
}

.calc-card::before {
  top: 8px;
  left: 8px;
  border-right: none;
  border-bottom: none;
}

.calc-card::after {
  bottom: 8px;
  right: 8px;
  border-left: none;
  border-top: none;
}

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

.calc-card:hover::before,
.calc-card:hover::after,
.calc-card:focus-within::before,
.calc-card:focus-within::after {
  opacity: 1;
  border-color: var(--color-accent);
}

.calc-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: var(--radius-s);
  background: var(--color-primary-tint);
  color: var(--color-primary-dark);
}

.calc-icon svg {
  width: 24px;
  height: 24px;
}

.calc-card h3 {
  font-size: var(--step-1);
  letter-spacing: -0.01em;
}

.calc-card p {
  color: var(--color-ink-soft);
  font-size: var(--step--1);
  flex-grow: 1;
}

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

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

@media (max-width: 940px) {
  .article-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 620px) {
  .article-grid {
    grid-template-columns: 1fr;
  }
}

.article-card {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-m);
  overflow: hidden;
  transition: box-shadow var(--transition), transform var(--transition);
}

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

.article-thumb {
  height: 8px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}

.article-body {
  padding: 1.4rem 1.4rem 1.6rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  flex-grow: 1;
}

.article-meta {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.article-body h3 {
  font-size: var(--step-1);
  line-height: 1.3;
}

.article-body h3 a {
  text-decoration: none;
  color: var(--color-ink);
}

.article-body h3 a:hover {
  color: var(--color-primary-dark);
}

.article-body p {
  color: var(--color-ink-soft);
  font-size: var(--step--1);
  flex-grow: 1;
}

.article-link {
  font-size: var(--step--1);
  font-weight: 700;
  color: var(--color-primary-dark);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.article-link svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition);
}

.article-link:hover svg {
  transform: translateX(3px);
}

/* -----------------------------
   10. Banda de confianza / valores
------------------------------ */
.value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
}

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

.value-item {
  padding: 1.4rem;
  border-left: 2px solid var(--color-accent);
}

.value-item h3 {
  font-size: var(--step-0);
  margin-bottom: 0.4rem;
}

.value-item p {
  color: var(--color-ink-soft);
  font-size: var(--step--1);
}

/* -----------------------------
   11. CTA final
------------------------------ */
.cta-band {
  padding-block: clamp(2.5rem, 2rem + 2vw, 4rem);
  background: var(--color-ink);
  color: #fff;
}

.cta-band .container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
}

.cta-band h2 {
  font-size: var(--step-2);
  max-width: 26ch;
}

.cta-band p {
  color: #c4cbc7;
  margin-top: 0.4rem;
}

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

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

/* -----------------------------
   12. Footer
------------------------------ */
.site-footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-line);
  padding-block: clamp(2rem, 1.6rem + 1.5vw, 3.5rem) 1.75rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: var(--gap);
}

@media (max-width: 760px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-brand .brand {
  margin-bottom: 0.75rem;
}

.footer-brand p {
  color: var(--color-ink-soft);
  font-size: var(--step--1);
  max-width: 32ch;
}

.footer-col h2 {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-ink-faint);
  margin-bottom: 0.9rem;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.footer-col a {
  text-decoration: none;
  font-size: var(--step--1);
  color: var(--color-ink-soft);
}

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

.footer-bottom {
  margin-top: clamp(2rem, 1.6rem + 1vw, 3rem);
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-line);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  font-size: 0.8rem;
  color: var(--color-ink-faint);
}

.footer-bottom a {
  text-decoration: underline;
}

/* -----------------------------
   13. Páginas de contenido (legal / sobre nosotros)
------------------------------ */
.page-hero {
  padding-block: clamp(2rem, 1.6rem + 2vw, 3.5rem);
  border-bottom: 1px solid var(--color-line);
}

.page-hero h1 {
  font-size: var(--step-3);
  letter-spacing: -0.015em;
  max-width: 26ch;
}

.page-hero .updated {
  margin-top: 0.75rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--color-ink-faint);
}

.prose {
  max-width: 74ch;
}

.prose h2 {
  font-size: var(--step-2);
  margin-top: 2.4rem;
  margin-bottom: 0.8rem;
  letter-spacing: -0.01em;
}

.prose h2:first-child {
  margin-top: 0;
}

.prose h3 {
  font-size: var(--step-1);
  margin-top: 1.6rem;
  margin-bottom: 0.5rem;
}

.prose p {
  margin-bottom: 1rem;
  color: var(--color-ink-soft);
}

.prose ul,
.prose ol {
  margin: 0 0 1.1rem;
  padding-left: 1.3rem;
  color: var(--color-ink-soft);
}

.prose ul {
  list-style: disc;
}

.prose ol {
  list-style: decimal;
}

.prose li {
  margin-bottom: 0.4rem;
}

.prose a {
  color: var(--color-primary-dark);
}

.prose strong {
  color: var(--color-ink);
}

.toc {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-m);
  padding: 1.25rem 1.5rem;
  margin-bottom: 2rem;
}

.toc h2 {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-ink-faint);
  margin-bottom: 0.7rem;
}

.toc ol {
  padding-left: 1.2rem;
  columns: 2;
  gap: 1.5rem;
}

.toc a {
  font-size: var(--step--1);
  text-decoration: none;
  color: var(--color-primary-dark);
}

.content-layout {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--gap);
  align-items: start;
}

@media (max-width: 860px) {
  .content-layout {
    grid-template-columns: 1fr;
  }
}

.side-card {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-m);
  padding: 1.5rem;
}

.side-card h2 {
  font-size: var(--step-0);
  margin-bottom: 0.6rem;
}

.side-card p {
  color: var(--color-ink-soft);
  font-size: var(--step--1);
  margin-bottom: 1rem;
}

/* -----------------------------
   14. Equipo (sobre nosotros)
------------------------------ */
.team-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
  margin-top: 1rem;
}

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

.team-card {
  padding: 1.4rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-m);
  background: var(--color-surface);
}

.team-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-primary-tint);
  color: var(--color-primary-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  margin-bottom: 0.9rem;
}

.team-card h3 {
  font-size: var(--step-0);
}

.team-card .role {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-accent-dark);
  margin: 0.15rem 0 0.6rem;
}

.team-card p {
  color: var(--color-ink-soft);
  font-size: var(--step--1);
}

/* -----------------------------
   15. Formulario de contacto
------------------------------ */
.contact-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--gap);
  align-items: start;
}

@media (max-width: 860px) {
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

.form-card {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-m);
  padding: clamp(1.5rem, 1.2rem + 1vw, 2.25rem);
}

.form-row {
  margin-bottom: 1.25rem;
}

.form-row label {
  display: block;
  font-weight: 700;
  font-size: var(--step--1);
  margin-bottom: 0.4rem;
}

.form-row .hint {
  font-weight: 400;
  color: var(--color-ink-faint);
}

.form-row input,
.form-row textarea,
.form-row select {
  width: 100%;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-s);
  background: var(--color-bg);
}

.form-row input:focus,
.form-row textarea:focus,
.form-row select:focus {
  background: var(--color-surface);
}

.form-row textarea {
  min-height: 130px;
  resize: vertical;
}

.form-check {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: var(--step--1);
  color: var(--color-ink-soft);
}

.form-check input {
  width: auto;
  margin-top: 0.25rem;
}

.form-msg {
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-s);
  font-size: var(--step--1);
  display: none;
}

.form-msg.is-visible {
  display: block;
}

.form-msg.success {
  background: var(--color-primary-tint);
  color: var(--color-primary-dark);
  border: 1px solid var(--color-primary);
}

.form-msg.error {
  background: var(--color-accent-tint);
  color: var(--color-accent-dark);
  border: 1px solid var(--color-accent);
}

.contact-info-list {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.contact-info-item {
  display: flex;
  gap: 0.9rem;
  align-items: flex-start;
}

.contact-info-item .calc-icon {
  flex: none;
}

.contact-info-item h3 {
  font-size: var(--step-0);
  margin-bottom: 0.2rem;
}

.contact-info-item p {
  color: var(--color-ink-soft);
  font-size: var(--step--1);
}

/* -----------------------------
   16. Banner de cookies
------------------------------ */
.cookie-banner {
  position: fixed;
  left: 1rem;
  right: 1rem;
  bottom: 1rem;
  z-index: 200;
  max-width: 720px;
  margin-inline: auto;
  background: var(--color-ink);
  color: #eef1ee;
  border-radius: var(--radius-m);
  padding: 1.25rem 1.4rem;
  box-shadow: 0 20px 40px -12px rgba(0, 0, 0, 0.35);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  transform: translateY(140%);
  opacity: 0;
  transition: transform var(--transition), opacity var(--transition);
}

.cookie-banner.is-visible {
  transform: translateY(0);
  opacity: 1;
}

.cookie-banner p {
  font-size: var(--step--1);
  max-width: 52ch;
  color: #c4cbc7;
}

.cookie-banner a {
  color: #fff;
  text-decoration: underline;
}

.cookie-actions {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.cookie-actions .btn-ghost {
  border-color: #465150;
  color: #fff;
}

/* -----------------------------
   17b. Herramienta de calculadora
   (reutilizable en todas las páginas /calculadoras/*.html)
------------------------------ */
.calc-tool {
  padding-block: clamp(2rem, 1.6rem + 2vw, 3.5rem);
}

.calc-tool-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
  align-items: start;
}

@media (max-width: 860px) {
  .calc-tool-grid {
    grid-template-columns: 1fr;
  }
}

.calc-form-card,
.calc-result-card {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-m);
  padding: clamp(1.5rem, 1.2rem + 1vw, 2.25rem);
}

.calc-form-card h2,
.calc-result-card h2 {
  font-size: var(--step-1);
  margin-bottom: 1.1rem;
}

.field-hint {
  display: block;
  font-weight: 400;
  color: var(--color-ink-faint);
  font-size: 0.8rem;
  margin-top: 0.2rem;
}

.field-error {
  display: none;
  color: var(--color-accent-dark);
  font-size: 0.8rem;
  margin-top: 0.4rem;
}

.form-row.has-error input {
  border-color: var(--color-accent);
}

.form-row.has-error .field-error {
  display: block;
}

.result-group + .result-group {
  margin-top: 1.4rem;
}

.result-group h3 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-ink-faint);
  margin-bottom: 0.7rem;
}

.result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0.75rem;
}

@media (max-width: 480px) {
  .result-grid {
    grid-template-columns: 1fr;
  }
}

.result-item {
  padding: 0.85rem 0.9rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-s);
  background: var(--color-bg);
}

.result-item .result-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-ink-faint);
  margin-bottom: 0.3rem;
}

.result-item .result-value {
  font-size: var(--step-1);
  font-weight: 700;
  font-family: var(--font-mono);
}

.result-item.energy {
  border-color: var(--color-primary);
  background: var(--color-primary-tint);
}

.result-item.energy .result-value {
  color: var(--color-primary-dark);
}

.result-item.cost {
  border-color: var(--color-accent);
  background: var(--color-accent-tint);
}

.result-item.cost .result-value {
  color: var(--color-accent-dark);
}

.result-placeholder {
  color: var(--color-ink-faint);
  font-size: var(--step--1);
}

.formula-note {
  margin-top: 1.4rem;
  padding-top: 1.1rem;
  border-top: 1px dashed var(--color-line-strong);
  font-size: var(--step--1);
  color: var(--color-ink-soft);
}

.formula-note code {
  font-family: var(--font-mono);
  background: var(--color-bg-alt);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-size: 0.85em;
}

.faq-item {
  margin-bottom: 1.5rem;
}

.faq-item h3 {
  font-size: var(--step-0);
  margin-bottom: 0.4rem;
}

.faq-item p {
  color: var(--color-ink-soft);
}

/* -----------------------------
   17. Breadcrumb
------------------------------ */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-ink-faint);
  margin-bottom: 0.9rem;
}

.breadcrumb a {
  text-decoration: none;
  color: var(--color-ink-faint);
}

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

.breadcrumb [aria-current="page"] {
  color: var(--color-ink-soft);
}