/* ==========================================================================
   VetPass — Landing Page
   Implementa las Style Guidelines de la sección 4.1 del informe: tipografías
   Poppins e Inter, la paleta documentada y la retícula base de 8 px.
   ========================================================================== */

/* --------------------------------------------------------------- tokens --- */
:root {
  /* Paleta (4.1.1). Las variantes -600 y -800 del primario se derivan para
     los estados de interacción, que la tabla del informe no enumera. */
  --primary-800: #115e59;
  --primary-700: #0f766e;
  --primary-600: #0d9488;
  --primary-50:  #f0fdfa;
  --secondary-500: #f59e0b;
  --neutral-900: #0f172a;
  --neutral-600: #475569;
  --neutral-200: #e2e8f0;
  --surface-50:  #f8fafc;
  --white: #ffffff;
  --success-600: #16a34a;
  --success-bg:  #ecfdf5;
  --warning-600: #d97706;
  --warning-bg:  #fffbeb;
  --danger-600:  #dc2626;
  /* Los tonos -600 del informe sirven como relleno e icono, pero como texto
     sobre fondo claro se quedan en 3.1:1. Estas variantes los sustituyen
     donde el color es texto, para sostener el mínimo de 4.5:1 que declara la
     sección 4.1.1: 4.76:1 y 4.84:1 respectivamente. */
  --success-text: #15803d;
  --warning-text: #b45309;

  /* Escala de espaciado sobre retícula de 8 px (4.1.1) */
  --space-1: 4px;  --space-2: 8px;  --space-3: 16px; --space-4: 24px;
  --space-5: 32px; --space-6: 48px; --space-7: 64px;

  --radius-container: 8px;
  --radius-control: 6px;
  --radius-pill: 999px;

  /* Tres niveles de elevación, para evitar jerarquías ambiguas */
  --shadow-1: 0 1px 2px rgba(15, 23, 42, .06);
  --shadow-2: 0 4px 12px rgba(15, 23, 42, .08);
  --shadow-3: 0 16px 40px rgba(15, 23, 42, .12);

  --content-max: 1200px;
  --gutter: 24px;

  --font-brand: "Poppins", system-ui, sans-serif;
  --font-ui: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 88px; }

body {
  margin: 0;
  font-family: var(--font-ui);
  font-size: 16px;      /* el cuerpo nunca baja de 16 px (4.1.1) */
  line-height: 24px;
  color: var(--neutral-900);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { margin: 0; font-family: var(--font-brand); }
h1 { font-size: 32px; line-height: 40px; font-weight: 600; letter-spacing: -.02em; }
h2 { font-size: 28px; line-height: 36px; font-weight: 600; letter-spacing: -.01em; }
h3 { font-family: var(--font-ui); font-size: 20px; line-height: 28px; font-weight: 600; }
p  { margin: 0; }
img, svg { display: block; max-width: 100%; }
a { color: var(--primary-700); }

.plain-list { list-style: none; margin: 0; padding: 0; }

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

/* Navegación por teclado siempre visible: contorno de 2 px en color primario
   (4.1.2). */
:focus-visible {
  outline: 2px solid var(--primary-700);
  outline-offset: 2px;
  border-radius: var(--radius-control);
}

.skip-link {
  position: absolute; left: var(--space-3); top: -60px; z-index: 100;
  padding: var(--space-2) var(--space-3);
  background: var(--primary-700); color: var(--white);
  border-radius: var(--radius-control); text-decoration: none;
  transition: top .15s ease;
}
.skip-link:focus { top: var(--space-3); }

.container {
  width: 100%; max-width: var(--content-max);
  margin-inline: auto; padding-inline: var(--gutter);
}
.container--narrow { max-width: 760px; }

/* ------------------------------------------------------------ controles --- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 40px; padding: var(--space-2) var(--space-4);
  font-family: var(--font-ui); font-size: 15px; font-weight: 600;
  border: 1px solid transparent; border-radius: var(--radius-control);
  text-decoration: none; cursor: pointer;
  transition: background-color .15s ease, border-color .15s ease, color .15s ease;
}
.btn--lg { min-height: 48px; padding: var(--space-3) var(--space-5); font-size: 16px; }
.btn--block { width: 100%; }

.btn--primary { background: var(--primary-700); color: var(--white); }
.btn--primary:hover { background: var(--primary-800); }
.btn--primary:active { background: var(--primary-800); }

.btn--ghost { background: var(--white); color: var(--primary-700); border-color: var(--neutral-200); }
.btn--ghost:hover { border-color: var(--primary-700); background: var(--primary-50); }

/* ------------------------------------------------------------ cabecera --- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease, box-shadow .2s ease;
}
/* Al despegarse del inicio, el encabezado se vuelve opaco: la translucidez
   depende de backdrop-filter, que no todos los navegadores aplican. */
.site-header.is-scrolled {
  background: var(--white);
  border-bottom-color: var(--neutral-200);
  box-shadow: var(--shadow-1);
}

.header__inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-4); min-height: 72px;
}

.brand { display: inline-flex; align-items: center; gap: var(--space-2); text-decoration: none; }
.brand__mark { color: var(--primary-700); }
.brand__name {
  font-family: var(--font-brand); font-weight: 600; font-size: 20px;
  color: var(--neutral-900);
}

.nav { display: flex; align-items: center; gap: var(--space-5); }
.nav__list { display: flex; align-items: center; gap: var(--space-4); list-style: none; margin: 0; padding: 0; }
.nav__list a {
  display: inline-block; padding: var(--space-2) 0;
  font-size: 15px; color: var(--neutral-600); text-decoration: none;
  border-bottom: 2px solid transparent;
}
.nav__list a:hover { color: var(--neutral-900); }
.nav__list a.is-active { color: var(--primary-700); border-bottom-color: var(--primary-700); }

/* Selector de idioma: dos destinos, con el activo marcado por aria-pressed y
   no solo por color. */
.lang {
  display: inline-flex; align-items: center; gap: 2px; padding: 2px;
  background: var(--surface-50);
  border: 1px solid var(--neutral-200); border-radius: var(--radius-pill);
}
.lang__btn {
  min-width: 40px; min-height: 32px; padding: 0 var(--space-2);
  font-family: inherit; font-size: 13px; font-weight: 600; letter-spacing: .02em;
  color: var(--neutral-600); background: none;
  border: 0; border-radius: var(--radius-pill); cursor: pointer;
}
.lang__btn:hover { color: var(--neutral-900); }
.lang__btn[aria-pressed="true"] { color: var(--white); background: var(--primary-700); }

.nav-toggle {
  display: none; width: 44px; height: 44px; padding: 0;
  background: none; border: 1px solid var(--neutral-200);
  border-radius: var(--radius-control); cursor: pointer;
}
.nav-toggle__bars, .nav-toggle__bars::before, .nav-toggle__bars::after {
  display: block; width: 18px; height: 2px; margin-inline: auto;
  background: var(--neutral-900); content: ""; transition: transform .2s ease, opacity .2s ease;
}
.nav-toggle__bars::before { transform: translateY(-6px); }
.nav-toggle__bars::after  { transform: translateY(4px); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after  { transform: translateY(-2px) rotate(-45deg); }

/* ---------------------------------------------------------------- hero --- */
.hero {
  padding-block: var(--space-7) var(--space-6);
  background: linear-gradient(180deg, var(--primary-50) 0%, var(--white) 70%);
}
.hero__inner { display: grid; gap: var(--space-6); align-items: center; }

.badge {
  display: inline-block; margin-bottom: var(--space-3);
  padding: var(--space-1) var(--space-3);
  font-size: 12px; line-height: 16px; font-weight: 500; letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--primary-800); background: var(--white);
  border: 1px solid var(--primary-700); border-radius: var(--radius-pill);
}
.hero h1 { max-width: 15ch; }
.lead {
  margin-top: var(--space-3); max-width: 52ch;
  font-size: 18px; line-height: 28px; color: var(--neutral-600);
}
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-5); }
.hero__stat {
  margin-top: var(--space-5); padding-top: var(--space-4);
  border-top: 1px solid var(--neutral-200);
  font-size: 14px; line-height: 20px; color: var(--neutral-600);
}
.hero__stat strong { color: var(--neutral-900); }
.hero__source { display: block; font-size: 12px; line-height: 16px; }

/* ------------------------------------------- vista de cartilla del hero --- */
.card-preview {
  background: var(--white); border: 1px solid var(--neutral-200);
  border-radius: var(--radius-container); box-shadow: var(--shadow-3);
  overflow: hidden;
}
.card-preview__head {
  display: flex; align-items: flex-start; justify-content: space-between;
  gap: var(--space-3); padding: var(--space-4);
  border-bottom: 1px solid var(--neutral-200);
}
.card-preview__pet { font-family: var(--font-brand); font-weight: 600; font-size: 20px; line-height: 28px; }
.card-preview__meta { margin-top: var(--space-1); font-size: 14px; line-height: 20px; color: var(--neutral-600); }
.card-preview__foot {
  padding: var(--space-3) var(--space-4);
  font-size: 12px; line-height: 16px; color: var(--neutral-600);
  background: var(--surface-50); border-top: 1px solid var(--neutral-200);
}

.dose-list { list-style: none; margin: 0; padding: 0; }
.dose {
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-3);
  padding: var(--space-3) var(--space-4); min-height: 64px;
}
.dose + .dose { border-top: 1px solid var(--neutral-200); }
.dose__name { font-weight: 600; font-size: 15px; }
.dose__meta { margin-top: 2px; font-size: 13px; line-height: 18px; color: var(--neutral-600); }

/* El estado nunca se comunica solo por color: siempre color, etiqueta e icono
   (regla de diseño inclusivo de 4.1.1). */
.chip {
  display: inline-flex; align-items: center; gap: 6px; flex-shrink: 0;
  padding: var(--space-1) var(--space-2);
  font-size: 13px; line-height: 18px; font-weight: 600;
  border-radius: var(--radius-pill); border: 1px solid currentColor;
}
.chip--sm { font-size: 12px; line-height: 16px; }
.chip__icon { width: 14px; height: 14px; fill: currentColor; flex-shrink: 0; }
.chip--ok   { color: var(--success-text); background: var(--success-bg); }
.chip--wait { color: var(--warning-text); background: var(--warning-bg); }

/* ------------------------------------------------------------ secciones --- */
.section { padding-block: var(--space-7); }
.section--tint { background: var(--surface-50); }
.section__head { max-width: 62ch; margin-bottom: var(--space-6); }
.section__lead { margin-top: var(--space-3); font-size: 17px; line-height: 26px; color: var(--neutral-600); }
.legal__fecha { margin-top: var(--space-2); font-size: 13px; line-height: 18px; color: var(--neutral-600); }
.eyebrow {
  margin-bottom: var(--space-2);
  font-size: 12px; line-height: 16px; font-weight: 500;
  letter-spacing: .08em; text-transform: uppercase; color: var(--primary-700);
}

.grid { display: grid; gap: var(--space-4); }

.card {
  padding: var(--space-4);
  background: var(--white); border: 1px solid var(--neutral-200);
  border-radius: var(--radius-container); box-shadow: var(--shadow-1);
}
.card p { margin-top: var(--space-2); color: var(--neutral-600); }

.feature { display: flex; gap: var(--space-3); align-items: flex-start; }
.feature__icon {
  display: grid; place-items: center; flex-shrink: 0;
  width: 44px; height: 44px; border-radius: var(--radius-container);
  background: var(--primary-50); color: var(--primary-700);
}
.feature__icon svg { width: 22px; height: 22px; fill: currentColor; }
.feature p { margin-top: var(--space-2); color: var(--neutral-600); }

/* --------------------------------------------------------------- pasos --- */
.steps {
  display: grid; gap: var(--space-4);
  list-style: none; margin: 0; padding: 0; counter-reset: paso;
}
.step {
  padding: var(--space-4);
  background: var(--white); border: 1px solid var(--neutral-200);
  border-radius: var(--radius-container);
}
.step__number {
  display: grid; place-items: center;
  width: 32px; height: 32px; margin-bottom: var(--space-3);
  font-family: var(--font-brand); font-weight: 600;
  color: var(--white); background: var(--primary-700);
  border-radius: var(--radius-pill);
}
.step p:last-child { margin-top: var(--space-2); color: var(--neutral-600); }

/* ----------------------------------------------------------------- faq --- */
.faq { border-top: 1px solid var(--neutral-200); }
.faq__item { border-bottom: 1px solid var(--neutral-200); }
.faq__item summary {
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-3);
  padding: var(--space-4) 0; min-height: 56px;
  font-weight: 600; cursor: pointer; list-style: none;
}
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary::after {
  content: "+"; font-size: 22px; font-weight: 400; color: var(--primary-700); line-height: 1;
}
.faq__item[open] summary::after { content: "−"; }
.faq__item p { padding-bottom: var(--space-4); color: var(--neutral-600); max-width: 70ch; }

/* ------------------------------------------------------------ contacto --- */
.section--cta { background: var(--primary-700); color: var(--white); }
.section--cta h2 { color: var(--white); }
.cta__inner { display: grid; gap: var(--space-6); align-items: start; }
.cta__copy p { margin-top: var(--space-3); color: rgba(255, 255, 255, .88); max-width: 48ch; }
.cta__alt { font-size: 15px; }
.cta__alt a { color: var(--white); text-decoration: underline; }

.form {
  display: grid; gap: var(--space-3);
  padding: var(--space-5);
  background: var(--white); border-radius: var(--radius-container);
  box-shadow: var(--shadow-3);
}
.field { display: grid; gap: var(--space-1); }
.field label { font-size: 14px; line-height: 20px; font-weight: 500; color: var(--neutral-900); }
.field input {
  min-height: 44px; padding: var(--space-2) var(--space-3);
  font-family: inherit; font-size: 16px; color: var(--neutral-900);
  background: var(--white);
  border: 1px solid var(--neutral-200); border-radius: var(--radius-control);
}
.field input:hover { border-color: var(--neutral-600); }
.field input:focus-visible { border-color: var(--primary-700); }
.field input[aria-invalid="true"] { border-color: var(--danger-600); }
/* La validación se comunica junto al campo que la origina y en el momento del
   ingreso, no al confirmar (4.1.2). */
.field__error { font-size: 13px; line-height: 18px; color: var(--danger-600); }
.form__status { font-size: 14px; line-height: 20px; color: var(--success-text); font-weight: 500; }
.form__status:empty { display: none; }

/* ----------------------------------------------------------------- pie --- */
.site-footer {
  padding-block: var(--space-5);
  background: var(--neutral-900); color: rgba(255, 255, 255, .72);
}
.footer__inner { display: grid; gap: var(--space-4); align-items: center; }
.footer__brand { display: flex; align-items: center; gap: var(--space-2); color: var(--white); }
.footer__name { font-family: var(--font-brand); font-weight: 600; color: var(--white); }
.footer__by { font-size: 13px; line-height: 18px; }
.footer__nav { display: flex; flex-wrap: wrap; gap: var(--space-3) var(--space-4); }
.footer__nav a { font-size: 14px; color: rgba(255, 255, 255, .8); text-decoration: none; }
.footer__nav a:hover { color: var(--white); text-decoration: underline; }
.footer__place { font-size: 13px; }

/* --------------------------------------------------- puntos de quiebre --- */
/* md: 768 px — el contenido deja de ser una sola columna */
@media (min-width: 768px) {
  .grid--2 { grid-template-columns: repeat(2, 1fr); gap: var(--space-5); }
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
  .steps   { grid-template-columns: repeat(3, 1fr); }
  .footer__inner { grid-template-columns: auto 1fr auto; gap: var(--space-5); }
  .footer__nav { justify-content: center; }
}

/* lg: 992 px — hero y contacto en dos columnas */
@media (min-width: 992px) {
  h1 { font-size: 44px; line-height: 52px; }
  .hero { padding-block: 96px var(--space-7); }
  .hero__inner { grid-template-columns: 1.05fr .95fr; gap: var(--space-7); }
  .cta__inner { grid-template-columns: 1fr 1fr; gap: var(--space-7); align-items: center; }
  .form { grid-template-columns: 1fr 1fr; }
  .form > .btn, .form > .form__status { grid-column: 1 / -1; }
}

/* Por debajo de 992 px la navegación se pliega en un panel desplegable */
@media (max-width: 991px) {
  .nav-toggle { display: grid; place-items: center; }
  .nav {
    position: absolute; left: 0; right: 0; top: 100%;
    display: none; flex-direction: column; align-items: stretch; gap: var(--space-3);
    padding: var(--space-4) var(--gutter) var(--space-5);
    background: var(--white); border-bottom: 1px solid var(--neutral-200);
    box-shadow: var(--shadow-2);
  }
  .nav.is-open { display: flex; }
  .nav__list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav__list a { padding: var(--space-3) 0; border-bottom: 1px solid var(--neutral-200); }
  .nav__list a.is-active { border-bottom-color: var(--primary-700); }
  .nav__cta { margin-top: var(--space-2); }
  .lang { align-self: flex-start; margin-top: var(--space-2); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}