/* =========================================================
   TorresTech - Hoja de estilos (mobile-first)
   Contrastes calculados sobre fondo indicado (WCAG 2.x):
   - text  #1f2937 / #ffffff  -> 14.7:1
   - muted #4b5563 / #ffffff  ->  7.6:1  (/ #f1f5f9 -> 6.9:1)
   - primary #1d4ed8 / #ffffff -> 6.7:1 (texto blanco en botón: 6.7:1)
   - error #b91c1c / #ffffff  ->  6.5:1
   - placeholder #5b6472 / #ffffff -> 6.0:1 (/ #fef2f2 en estado de error -> 5.5:1)
   - footer #e2e8f0 / #0f172a -> 14.5:1 ; enlaces #93c5fd / #0f172a -> 9.9:1
   ========================================================= */

:root {
  /* Colores */
  --color-primary: #1d4ed8;
  --color-primary-dark: #1e3a8a;
  --color-primary-soft: #eff6ff;
  --color-on-primary: #ffffff;
  --color-text: #1f2937;
  --color-muted: #4b5563;
  --color-placeholder: #5b6472; /* 6.0:1 sobre #ffffff; 5.5:1 sobre #fef2f2 (campo con error) */
  --color-bg: #ffffff;
  --color-bg-alt: #f1f5f9;
  --color-border: #cbd5e1;
  --color-input-border: #64748b; /* 4.8:1 sobre blanco (>= 3:1 para bordes de controles) */
  --color-error: #b91c1c;
  --color-error-bg: #fef2f2;
  --color-success: #166534;
  --color-success-bg: #f0fdf4;
  --color-footer-bg: #0f172a;
  --color-footer-text: #e2e8f0;
  --color-footer-link: #93c5fd;
  --color-notice-bg: #fef3c7;
  --color-notice-text: #78350f;
  --color-focus: #1d4ed8;

  /* Tipografía */
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --fs-sm: 0.9375rem;
  --fs-base: 1rem;
  --fs-lg: 1.125rem;
  --fs-h3: 1.1875rem;
  --fs-h2: clamp(1.625rem, 4vw, 2.25rem);
  --fs-h1: clamp(2rem, 6vw, 3.25rem);

  /* Espaciados */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4.5rem;

  /* Radios */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-pill: 999px;

  /* Sombras */
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06), 0 1px 3px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08), 0 2px 4px rgba(15, 23, 42, 0.06);

  /* Layout */
  --container: 72rem;
  --container-narrow: 44rem;
  --header-h: 4rem;
  --transition: 180ms ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + var(--space-4));
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

h1, h2, h3 {
  line-height: 1.2;
  margin: 0 0 var(--space-3);
}

p {
  margin: 0 0 var(--space-4);
}

a {
  color: var(--color-primary);
  text-underline-offset: 0.15em;
}

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

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

ul[role="list"] {
  list-style: none;
  margin: 0;
  padding: 0;
}

/* ---------- Accesibilidad ---------- */
:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

main:focus {
  outline: none;
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.skip-link {
  position: absolute;
  top: var(--space-2);
  left: var(--space-2);
  z-index: 100;
  padding: var(--space-2) var(--space-4);
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-weight: 600;
  border-radius: var(--radius-sm);
  transform: translateY(-200%);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: none;
  color: var(--color-on-primary);
  outline-color: var(--color-primary-dark);
}

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.container-narrow {
  max-width: var(--container-narrow);
}

.section {
  padding-block: var(--space-7);
}

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

.section-header {
  margin-bottom: var(--space-6);
  text-align: center;
}

.section-header h2 {
  font-size: var(--fs-h2);
}

.section-header p {
  color: var(--color-muted);
  font-size: var(--fs-lg);
  margin-bottom: 0;
}

/* ---------- Botones ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: var(--space-3) var(--space-5);
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background-color var(--transition), color var(--transition), border-color var(--transition);
}

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

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

.btn-secondary {
  background: var(--color-bg);
  color: var(--color-primary);
  border-color: var(--color-primary);
}

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

.btn-block {
  width: 100%;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-h);
  gap: var(--space-2);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--color-text);
  text-decoration: none;
}

.logo:hover {
  color: var(--color-text);
}

.logo-mark {
  display: inline-grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  background: var(--color-primary);
  color: var(--color-on-primary);
  border-radius: var(--radius-sm);
  font-size: 1rem;
}

.nav-toggle {
  display: none; /* sin JS el botón no se muestra */
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0 var(--space-2);
  background: transparent;
  border: 2px solid var(--color-input-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Sin JS: el nav siempre es visible y envuelve en móvil */
.site-nav {
  width: 100%;
  padding-bottom: var(--space-2);
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-2);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list a {
  display: block;
  padding: var(--space-2) var(--space-3);
  color: var(--color-text);
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius-sm);
}

.nav-list a:hover {
  background: var(--color-bg-alt);
  color: var(--color-primary-dark);
}

.nav-list .nav-cta {
  background: var(--color-primary);
  color: var(--color-on-primary);
}

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

/* Con JS en móvil: menú colapsable.
   Breakpoint móvil: max-width 48rem / escritorio: min-width 48.0625rem.
   Mantener sincronizado con MOBILE_QUERY en js/main.js. */
@media (max-width: 48rem) {
  .js .nav-toggle {
    display: inline-flex;
  }

  .js .site-nav {
    display: none;
  }

  .js .site-nav.is-open {
    display: block;
  }

  .js .nav-list {
    flex-direction: column;
    padding-block: var(--space-2);
  }

  /* Sin JS el menú queda desplegado y el header es alto: sin sticky para que no tape las anclas */
  .no-js .site-header {
    position: static;
  }
}

/* ---------- Hero ---------- */
.hero {
  background: var(--color-primary-soft);
  padding-block: var(--space-8);
}

.hero-inner {
  max-width: 52rem;
  text-align: center;
}

.eyebrow {
  display: inline-block;
  margin-bottom: var(--space-4);
  padding: var(--space-1) var(--space-3);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--color-primary);  /* 6.7:1 sobre su fondo #ffffff (6.2:1 sobre #eff6ff) */
  background: var(--color-bg);
  border-radius: var(--radius-pill);
}

.hero h1 {
  font-size: var(--fs-h1);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-4);
}

.hero-lead {
  font-size: var(--fs-lg);
  color: var(--color-muted); /* 6.9:1 sobre #eff6ff */
  margin-bottom: var(--space-6);
}

.hero-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  justify-content: center;
}

/* ---------- Tarjetas de servicios ---------- */
.cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

.card {
  padding: var(--space-5);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card h3 {
  font-size: var(--fs-h3);
}

.card p {
  color: var(--color-muted);
  margin-bottom: 0;
}

.card-icon {
  display: inline-grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  margin-bottom: var(--space-4);
  color: var(--color-primary);
  background: var(--color-primary-soft);
  border-radius: var(--radius-md);
}

/* ---------- Beneficios ---------- */
.benefits {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

.benefit {
  padding: var(--space-5);
  background: var(--color-bg);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
}

.benefit h3 {
  font-size: var(--fs-h3);
}

.benefit p {
  color: var(--color-muted);
  margin-bottom: 0;
}

/* ---------- Proceso ---------- */
.steps {
  counter-reset: paso;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

.step {
  counter-increment: paso;
  position: relative;
  padding: var(--space-5);
  padding-top: calc(var(--space-5) + 2.75rem);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.step::before {
  content: counter(paso);
  position: absolute;
  top: var(--space-5);
  left: var(--space-5);
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  font-weight: 700;
  color: var(--color-on-primary);
  background: var(--color-primary);
  border-radius: 50%;
}

.step h3 {
  font-size: var(--fs-h3);
}

.step p {
  color: var(--color-muted);
  margin-bottom: 0;
}

/* ---------- FAQ ---------- */
.faq-list {
  display: grid;
  gap: var(--space-3);
}

.faq-item {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.faq-item summary {
  padding: var(--space-4) var(--space-5);
  font-weight: 600;
  cursor: pointer;
  border-radius: var(--radius-md);
}

.faq-item[open] summary {
  border-bottom: 1px solid var(--color-border);
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
}

.faq-item p {
  padding: var(--space-4) var(--space-5);
  margin: 0;
  color: var(--color-muted);
}

/* ---------- Formulario ---------- */
.contact-form {
  padding: var(--space-5);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.form-note {
  font-size: var(--fs-sm);
  color: var(--color-muted);
}

.field {
  margin-bottom: var(--space-5);
}

.field label {
  display: block;
  margin-bottom: var(--space-2);
  font-weight: 600;
}

.req {
  color: var(--color-error);
}

.optional {
  font-weight: 400;
  color: var(--color-muted);
}

.field input[type="text"],
.field input[type="email"],
.field input[type="tel"],
.field select,
.field textarea {
  display: block;
  width: 100%;
  min-height: 2.75rem;
  padding: var(--space-2) var(--space-3);
  font: inherit;
  color: var(--color-text);
  background: var(--color-bg);
  border: 2px solid var(--color-input-border);
  border-radius: var(--radius-sm);
}

.field textarea {
  resize: vertical;
  min-height: 8rem;
}

.field ::placeholder {
  color: var(--color-placeholder);
  opacity: 1;
}

.field [aria-invalid="true"] {
  border-color: var(--color-error);
  background: var(--color-error-bg);
}

.field-hint {
  margin: var(--space-1) 0 0;
  font-size: var(--fs-sm);
  color: var(--color-muted);
}

.field-error {
  margin: var(--space-1) 0 0;
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--color-error); /* 6.5:1 sobre el fondo del formulario #ffffff (5.9:1 sobre #fef2f2) */
}

.field-error:empty {
  display: none;
}

.field-check {
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: var(--space-3);
  align-items: start;
}

.field-check input {
  width: 1.375rem;
  height: 1.375rem;
  margin: 0.15rem 0 0;
  accent-color: var(--color-primary);
}

.field-check label {
  margin: 0;
}

.field-check .field-hint,
.field-check .field-error {
  grid-column: 2;
}

.form-status:not(:empty) {
  margin-top: var(--space-5);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  color: var(--color-success); /* 6.8:1 sobre #f0fdf4 */
  background: var(--color-success-bg);
  border: 1px solid var(--color-success);
}

.form-status.is-error {
  color: var(--color-error);
  background: var(--color-error-bg);
  border-color: var(--color-error);
}

.form-status p {
  margin: 0 0 var(--space-2);
}

.form-status p:last-child {
  margin-bottom: 0;
}

.form-status a {
  color: inherit;
  font-weight: 600;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-footer-bg);
  color: var(--color-footer-text);
  padding-top: var(--space-7);
  --color-focus: var(--color-footer-link);
}

.site-footer a {
  color: var(--color-footer-link);
}

.site-footer a:hover {
  color: #ffffff;
}

.footer-inner {
  display: grid;
  gap: var(--space-6);
}

.footer-name {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: var(--space-2);
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-2);
}

.footer-bottom {
  margin-top: var(--space-6);
  padding-block: var(--space-5);
  border-top: 1px solid #334155;
  font-size: var(--fs-sm);
}

.footer-bottom p:last-child {
  margin-bottom: 0;
}

.demo-notice {
  padding: var(--space-3) var(--space-4);
  color: var(--color-notice-text); /* 7.9:1 sobre #fef3c7 */
  background: var(--color-notice-bg);
  border-radius: var(--radius-sm);
}

/* ---------- Breakpoints ---------- */
@media (min-width: 36rem) {
  .hero-actions {
    flex-direction: row;
  }

  .cards,
  .benefits,
  .steps {
    grid-template-columns: repeat(2, 1fr);
  }

  .contact-form {
    padding: var(--space-6);
  }
}

/* Escritorio: complementario de (max-width: 48rem); sincronizado con MOBILE_QUERY en js/main.js */
@media (min-width: 48.0625rem) {
  .header-inner {
    flex-wrap: nowrap;
  }

  .site-nav {
    width: auto;
    padding-bottom: 0;
  }

  .nav-list {
    align-items: center;
  }

  .section {
    padding-block: var(--space-8);
  }

  .footer-inner {
    grid-template-columns: 2fr 1fr;
  }
}

@media (min-width: 64rem) {
  .cards {
    grid-template-columns: repeat(3, 1fr);
  }

  .benefits,
  .steps {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ---------- Movimiento reducido ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }

  .card:hover {
    transform: none;
  }
}