/* ==========================================================================
   Banco de Sangre — Cruz Roja Colombiana Seccional Norte de Santander
   Estilos personalizados complementarios a Tailwind CSS
   ========================================================================== */

:root {
  --color-rojo-principal: #ED1C24;
  --color-rojo-oscuro:    #B71C1C;
  --color-rojo-suave:     #FFEBEE;
  --color-blanco:         #FFFFFF;
  --color-gris-fondo:     #F5F5F5;
  --color-gris-oscuro:    #2D2D2D;
  --color-gris-medio:     #757575;
  --color-verde:          #4CAF50;
  --color-dorado:         #FFC107;

  --header-altura: 80px;
  --header-altura-scroll: 64px;
}

/* --------------------------------------------------------------------------
   Base
   -------------------------------------------------------------------------- */

html {
  scroll-behavior: smooth;
  /* Compensa la altura del header fijo al saltar a un ancla */
  scroll-padding-top: var(--header-altura);
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  color: var(--color-gris-oscuro);
  font-size: 16px;
  line-height: 1.65;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: 'Montserrat', 'Inter', sans-serif;
  font-weight: 700;
  line-height: 1.2;
}

/* Contenedor máximo centrado */
.contenedor {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: 1.25rem;
}

/* Separación generosa entre secciones */
.seccion {
  padding-block: 48px;
}

@media (min-width: 768px) {
  .seccion { padding-block: 80px; }
}

.seccion-gris { background-color: var(--color-gris-fondo); }
.seccion-blanca { background-color: var(--color-blanco); }

/* --------------------------------------------------------------------------
   Tipografía de secciones
   -------------------------------------------------------------------------- */

.titulo-hero {
  font-size: 32px;
  letter-spacing: -0.02em;
}

.titulo-seccion {
  font-size: 28px;
  color: var(--color-gris-oscuro);
}

.subtitulo-seccion {
  font-size: 16px;
  color: var(--color-gris-medio);
  max-width: 640px;
  margin-inline: auto;
}

.titulo-card { font-size: 20px; }

.texto-pequeno { font-size: 14px; }

@media (min-width: 768px) {
  .titulo-hero    { font-size: 48px; }
  .titulo-seccion { font-size: 36px; }
  .titulo-card    { font-size: 24px; }
}

/* Línea decorativa bajo los títulos de sección */
.titulo-seccion::after {
  content: '';
  display: block;
  width: 64px;
  height: 4px;
  margin: 16px auto 0;
  border-radius: 999px;
  background-color: var(--color-rojo-principal);
}

/* --------------------------------------------------------------------------
   Botones
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .875rem 1.75rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 16px;
  text-align: center;
  cursor: pointer;
  transition: all .3s ease;
}

.btn-primario {
  background-color: var(--color-rojo-principal);
  color: #fff;
  box-shadow: 0 4px 6px rgba(237, 28, 36, .25);
}

.btn-primario:hover {
  background-color: var(--color-rojo-oscuro);
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(183, 28, 28, .3);
}

.btn-secundario {
  background-color: transparent;
  color: #fff;
  border: 2px solid rgba(255, 255, 255, .8);
}

.btn-secundario:hover {
  background-color: #fff;
  color: var(--color-rojo-oscuro);
  transform: translateY(-2px);
}

.btn-contorno {
  background-color: transparent;
  color: var(--color-rojo-principal);
  border: 2px solid var(--color-rojo-principal);
}

.btn-contorno:hover {
  background-color: var(--color-rojo-principal);
  color: #fff;
}

.btn-blanco {
  background-color: #fff;
  color: var(--color-rojo-principal);
}

.btn-blanco:hover {
  background-color: var(--color-rojo-suave);
  transform: translateY(-2px);
}

/* --------------------------------------------------------------------------
   Cards
   -------------------------------------------------------------------------- */

.card {
  background-color: #fff;
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, .1);
  transition: all .3s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, .12);
}

.card-icono {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 12px;
  background-color: var(--color-rojo-suave);
  color: var(--color-rojo-principal);
  margin-bottom: 1.25rem;
}

.card-icono svg { width: 28px; height: 28px; }

/* Mini-card usada en la grilla de requisitos */
.card-requisito {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: .875rem;
  background-color: #fff;
  border: 1px solid #e5e5e5;
  border-radius: 12px;
  padding: 1.5rem 1rem;
  transition: all .3s ease;
}

.card-requisito:hover {
  border-color: var(--color-rojo-principal);
  transform: translateY(-4px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, .08);
}

.card-requisito svg {
  width: 32px;
  height: 32px;
  color: var(--color-rojo-principal);
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background-color: #fff;
  transition: all .3s ease;
}

.header--scrolled {
  box-shadow: 0 2px 12px rgba(0, 0, 0, .1);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-altura);
  transition: height .3s ease;
}

.header--scrolled .header__inner {
  height: var(--header-altura-scroll);
}

.header__logo img {
  height: 52px;
  width: auto;
  transition: height .3s ease;
}

.header--scrolled .header__logo img { height: 42px; }

.nav-link {
  position: relative;
  font-weight: 500;
  font-size: 15px;
  color: var(--color-gris-oscuro);
  transition: color .3s ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 2px;
  background-color: var(--color-rojo-principal);
  transition: width .3s ease;
}

.nav-link:hover { color: var(--color-rojo-principal); }
.nav-link:hover::after { width: 100%; }

/* Menú mobile */
.menu-mobile {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(320px, 85vw);
  background-color: #fff;
  z-index: 60;
  transform: translateX(100%);
  transition: transform .3s ease;
  box-shadow: -4px 0 24px rgba(0, 0, 0, .15);
  overflow-y: auto;
}

.menu-mobile--abierto { transform: translateX(0); }

.menu-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, .5);
  z-index: 55;
  opacity: 0;
  visibility: hidden;
  transition: all .3s ease;
}

.menu-overlay--visible {
  opacity: 1;
  visibility: visible;
}

.menu-mobile a {
  display: block;
  padding: .875rem 1.5rem;
  font-weight: 500;
  border-bottom: 1px solid #f0f0f0;
  transition: all .3s ease;
}

.menu-mobile a:hover {
  background-color: var(--color-rojo-suave);
  color: var(--color-rojo-principal);
}

/* Compensación del header fijo para el contenido */
.contenido-principal { padding-top: var(--header-altura); }

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */

.hero {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 88vh;
  background:
    linear-gradient(135deg, rgba(183, 28, 28, .92) 0%, rgba(45, 45, 45, .95) 100%),
    url('../images/hero-bg.jpg') center/cover no-repeat;
  color: #fff;
  overflow: hidden;
}

/* Gotas decorativas de fondo */
.hero__decoracion {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .12;
}

.hero__contenido {
  position: relative;
  z-index: 2;
  text-align: center;
  padding-block: 4rem;
}

.hero__badge {
  display: inline-block;
  padding: .5rem 1.25rem;
  border-radius: 999px;
  background-color: rgba(255, 255, 255, .15);
  border: 1px solid rgba(255, 255, 255, .3);
  backdrop-filter: blur(4px);
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 1.5rem;
}

.hero__indicadores {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  max-width: 720px;
  margin: 3.5rem auto 0;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, .2);
}

.hero__numero {
  font-family: 'Montserrat', sans-serif;
  font-size: 36px;
  font-weight: 800;
  line-height: 1;
}

@media (min-width: 768px) {
  .hero__numero { font-size: 48px; }
}

/* --------------------------------------------------------------------------
   Tabs
   -------------------------------------------------------------------------- */

.tabs-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: .75rem;
  margin-bottom: 2.5rem;
}

.tab-btn {
  padding: .75rem 1.75rem;
  border-radius: 8px;
  font-weight: 600;
  color: var(--color-gris-medio);
  background-color: #fff;
  border: 2px solid #e5e5e5;
  cursor: pointer;
  transition: all .3s ease;
}

.tab-btn:hover { border-color: var(--color-rojo-principal); }

.tab-btn--activo {
  background-color: var(--color-rojo-principal);
  border-color: var(--color-rojo-principal);
  color: #fff;
}

.tab-panel { display: none; }
.tab-panel--activo {
  display: block;
  animation: fadeIn .4s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Badges de datos clave dentro de los tabs */
.dato-clave {
  background-color: var(--color-rojo-suave);
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
}

.dato-clave__valor {
  display: block;
  font-family: 'Montserrat', sans-serif;
  font-weight: 700;
  font-size: 18px;
  color: var(--color-rojo-oscuro);
}

.dato-clave__etiqueta {
  font-size: 13px;
  color: var(--color-gris-medio);
}

/* Listas con checkmark verde */
.lista-check li {
  position: relative;
  padding-left: 1.75rem;
  margin-bottom: .625rem;
}

.lista-check li::before {
  content: '';
  position: absolute;
  left: 0;
  top: .45em;
  width: 18px;
  height: 18px;
  background-color: var(--color-verde);
  border-radius: 50%;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
  background-size: 12px;
  background-position: center;
  background-repeat: no-repeat;
}

/* --------------------------------------------------------------------------
   Timeline del proceso de donación
   -------------------------------------------------------------------------- */

.proceso {
  position: relative;
  display: grid;
  gap: 2rem;
  grid-template-columns: 1fr;
}

.proceso__paso {
  position: relative;
  background-color: #fff;
  border-radius: 12px;
  padding: 2rem 1.5rem;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0, 0, 0, .1);
  transition: all .3s ease;
}

.proceso__paso:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, .12);
}

.proceso__numero {
  position: absolute;
  top: -18px;
  left: 50%;
  transform: translateX(-50%);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background-color: var(--color-rojo-principal);
  color: #fff;
  font-family: 'Montserrat', sans-serif;
  font-weight: 700;
  font-size: 15px;
  box-shadow: 0 4px 8px rgba(237, 28, 36, .3);
}

.proceso__icono {
  color: var(--color-rojo-principal);
  margin: 1.25rem auto .875rem;
}

.proceso__icono svg { width: 36px; height: 36px; }

@media (min-width: 1024px) {
  .proceso {
    grid-template-columns: repeat(5, 1fr);
    gap: 1.25rem;
  }
  /* Línea horizontal que conecta los pasos */
  .proceso::before {
    content: '';
    position: absolute;
    top: 4px;
    left: 10%;
    right: 10%;
    height: 2px;
    background: repeating-linear-gradient(
      to right,
      var(--color-rojo-principal) 0 8px,
      transparent 8px 16px
    );
  }
}

/* --------------------------------------------------------------------------
   Sección de impacto (contadores)
   -------------------------------------------------------------------------- */

.impacto {
  background-color: var(--color-rojo-principal);
  color: #fff;
}

.impacto__numero {
  font-family: 'Montserrat', sans-serif;
  font-size: 40px;
  font-weight: 800;
  line-height: 1;
}

@media (min-width: 768px) {
  .impacto__numero { font-size: 56px; }
}

/* --------------------------------------------------------------------------
   Acordeón (FAQ)
   -------------------------------------------------------------------------- */

.acordeon-item {
  background-color: #fff;
  border-radius: 12px;
  margin-bottom: .875rem;
  overflow: hidden;
  box-shadow: 0 2px 4px rgba(0, 0, 0, .06);
}

.acordeon-pregunta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
  padding: 1.25rem 1.5rem;
  text-align: left;
  font-weight: 600;
  font-size: 16px;
  cursor: pointer;
  transition: all .3s ease;
}

.acordeon-pregunta:hover { color: var(--color-rojo-principal); }

.acordeon-icono {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  color: var(--color-rojo-principal);
  transition: transform .3s ease;
}

.acordeon-item--abierto .acordeon-icono { transform: rotate(45deg); }

.acordeon-respuesta {
  max-height: 0;
  overflow: hidden;
  transition: max-height .35s ease;
}

.acordeon-respuesta > div {
  padding: 0 1.5rem 1.25rem;
  color: var(--color-gris-medio);
}

/* --------------------------------------------------------------------------
   Timeline de historia
   -------------------------------------------------------------------------- */

.historia {
  position: relative;
  max-width: 800px;
  margin-inline: auto;
  padding-left: 2.5rem;
}

.historia::before {
  content: '';
  position: absolute;
  left: 11px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background-color: rgba(237, 28, 36, .3);
}

.historia__hito {
  position: relative;
  margin-bottom: 2.5rem;
}

.historia__hito:last-child { margin-bottom: 0; }

.historia__punto {
  position: absolute;
  left: -2.5rem;
  top: 4px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background-color: var(--color-rojo-principal);
  border: 4px solid #fff;
  box-shadow: 0 0 0 2px var(--color-rojo-principal);
}

.historia__anio {
  font-family: 'Montserrat', sans-serif;
  font-weight: 800;
  font-size: 22px;
  color: var(--color-rojo-principal);
  margin-bottom: .5rem;
}

/* --------------------------------------------------------------------------
   Formulario
   -------------------------------------------------------------------------- */

.campo-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: .375rem;
}

.campo {
  width: 100%;
  padding: .75rem 1rem;
  border: 1px solid #d4d4d4;
  border-radius: 8px;
  font-size: 15px;
  font-family: inherit;
  background-color: #fff;
  transition: all .3s ease;
}

.campo:focus {
  outline: none;
  border-color: var(--color-rojo-principal);
  box-shadow: 0 0 0 3px rgba(237, 28, 36, .12);
}

.campo:invalid:not(:placeholder-shown) { border-color: #e57373; }

.requerido { color: var(--color-rojo-principal); }

/* --------------------------------------------------------------------------
   Widget flotante de WhatsApp y botón volver arriba
   -------------------------------------------------------------------------- */

.whatsapp-flotante {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 45;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background-color: #25D366;
  color: #fff;
  box-shadow: 0 4px 12px rgba(0, 0, 0, .3);
  animation: pulso 5s ease-in-out infinite;
  transition: transform .3s ease;
}

.whatsapp-flotante:hover { transform: scale(1.1); }
.whatsapp-flotante svg { width: 34px; height: 34px; }

@keyframes pulso {
  0%, 90%, 100% { box-shadow: 0 4px 12px rgba(0, 0, 0, .3); }
  93%  { box-shadow: 0 4px 12px rgba(0, 0, 0, .3), 0 0 0 0 rgba(37, 211, 102, .6); }
  99%  { box-shadow: 0 4px 12px rgba(0, 0, 0, .3), 0 0 0 18px rgba(37, 211, 102, 0); }
}

/* Tooltip del widget */
.whatsapp-tooltip {
  position: absolute;
  right: 72px;
  white-space: nowrap;
  background-color: var(--color-gris-oscuro);
  color: #fff;
  font-size: 13px;
  padding: .5rem .75rem;
  border-radius: 8px;
  opacity: 0;
  visibility: hidden;
  transition: all .3s ease;
}

.whatsapp-flotante:hover .whatsapp-tooltip {
  opacity: 1;
  visibility: visible;
}

.btn-arriba {
  position: fixed;
  left: 20px;
  bottom: 20px;
  z-index: 45;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--color-gris-oscuro);
  color: #fff;
  border: none;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all .3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, .25);
}

.btn-arriba--visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.btn-arriba:hover { background-color: var(--color-rojo-principal); }
.btn-arriba svg { width: 22px; height: 22px; }

/* --------------------------------------------------------------------------
   Scroll reveal
   -------------------------------------------------------------------------- */

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .6s ease, transform .6s ease;
}

.reveal--visible {
  opacity: 1;
  transform: translateY(0);
}

/* Respeta la preferencia de movimiento reducido del sistema */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .whatsapp-flotante { animation: none; }
  * { transition-duration: .01ms !important; }
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

.footer {
  background-color: var(--color-gris-oscuro);
  color: #d4d4d4;
}

.footer h4 {
  color: #fff;
  font-size: 16px;
  margin-bottom: 1.125rem;
}

.footer a { transition: color .3s ease; }
.footer a:hover { color: var(--color-rojo-principal); }

.footer__logo {
  height: 56px;
  width: auto;
  /* El logo original es a color sobre blanco: se aclara para el fondo oscuro */
  background-color: #fff;
  padding: .5rem .75rem;
  border-radius: 8px;
}

.footer__social {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, .1);
  transition: all .3s ease;
}

.footer__social:hover { background-color: var(--color-rojo-principal); }
.footer__social svg { width: 20px; height: 20px; }