/* ==========================================================================
   HEADER Y NAVEGACIÓN
   --------------------------------------------------------------------------
   - Fijo arriba, siempre con fondo translúcido para que se distinga;
     se vuelve más sólido al hacer scroll (.is-scrolled, vía JS).
   - En pantallas menores a 1280px el menú se abre como panel a pantalla completa.
   ========================================================================== */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  height: var(--header-h);
  /* Fondo visible desde el inicio (no transparente) */
  background: color-mix(in srgb, var(--c-bg) 62%, transparent);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border-bottom: 1px solid var(--c-line-strong);
  transition:
    background-color var(--dur-med) ease,
    box-shadow var(--dur-med) ease;
}

/* Línea de gradiente de marca en el borde inferior */
.site-header::after {
  content: "";
  position: absolute;
  inset: auto 0 -1px 0;
  height: 1px;
  background: var(--grad-brand);
  opacity: 0.5;
}

.site-header.is-scrolled {
  background: color-mix(in srgb, var(--c-bg) 88%, transparent);
  box-shadow: 0 12px 30px -18px rgba(0, 0, 0, 0.6);
}

/* En pantallas chicas el header es más bajo */
@media (max-width: 700px) {
  :root {
    --header-h: 84px;
  }

}

.site-header__inner {
  max-width: 1480px; /* un poco más ancho que el resto: logo + nombre + menú */
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: var(--sp-5);
}

/* ---------- Logo ---------- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-3);
  font-family: var(--ff-display);
  font-size: clamp(1.3125rem, 1.15rem + 0.5vw, 1.625rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  white-space: nowrap;
  flex-shrink: 0;
  position: relative;
  z-index: 2;
}

/* Logo de Kato Labs (imagen PNG con fondo transparente en assets/img/brand/) */
.brand__logo-wrap {
  position: relative;
  display: inline-block;
  line-height: 0;
  transition: transform var(--dur-med) var(--ease-out);
}

.brand__logo {
  height: 38px;
  width: auto;
}

.brand:hover .brand__logo-wrap {
  transform: scale(1.04);
}

/* ---------- Animación: las "raíces" (circuito) de la T ----------
   Cada línea usa pathLength="1": se dibuja animando stroke-dashoffset de 1 a 0.
   Orden: tallo → ramas → venas → nodos; después una chispa recorre el
   circuito cada pocos segundos. */
.brand__roots {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: none;
}

.roots-line {
  fill: none;
  stroke: var(--c-teal);
  stroke-width: 3.6;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  filter: drop-shadow(0 0 3px rgba(var(--c-teal-rgb), 0.9));
  animation: roots-grow 1.1s var(--ease-out) 0.3s forwards;
  transition: filter var(--dur-med) ease;
}

.roots-line--b1 { animation-delay: 1.05s; animation-duration: 0.45s; }
.roots-line--b2 { animation-delay: 1.25s; animation-duration: 0.45s; }

/* Venas: en el lado verde de la hoja */
.roots-line--v1,
.roots-line--v2 {
  stroke: #8FD8A0;
  filter: drop-shadow(0 0 3px rgba(143, 216, 160, 0.9));
}

.roots-line--v1 { animation-delay: 1.45s; animation-duration: 0.5s; }
.roots-line--v2 { animation-delay: 1.6s;  animation-duration: 0.5s; }

.roots-node {
  fill: var(--c-teal);
  filter: drop-shadow(0 0 4px rgba(var(--c-teal-rgb), 1));
  transform-box: fill-box;
  transform-origin: center;
  transform: scale(0);
  animation: roots-node-pop 0.45s var(--ease-out) 0.2s forwards;
}

.roots-node--b1 { animation-delay: 1.4s; }
.roots-node--b2 { animation-delay: 1.6s; }

/* Chispa: un segmento corto y brillante que viaja por el circuito */
.roots-pulse {
  fill: none;
  stroke: #FFFFFF;
  stroke-width: 4;
  stroke-linecap: round;
  stroke-dasharray: 0.07 1;
  stroke-dashoffset: 0.07;
  opacity: 0;
  filter: drop-shadow(0 0 4px rgba(var(--c-teal-rgb), 1));
  animation: roots-pulse 4s ease-in-out 2.4s infinite;
}

/* Al pasar el mouse el circuito brilla más */
.brand:hover .roots-line {
  filter: drop-shadow(0 0 6px rgba(var(--c-teal-rgb), 1));
}

@keyframes roots-grow {
  to { stroke-dashoffset: 0; }
}

@keyframes roots-node-pop {
  0%   { transform: scale(0); }
  70%  { transform: scale(1.35); }
  100% { transform: scale(1); }
}

@keyframes roots-pulse {
  0%   { stroke-dashoffset: 0.07;  opacity: 1; }
  45%  { stroke-dashoffset: -1;    opacity: 1; }
  46%, 100% { stroke-dashoffset: -1; opacity: 0; }
}

/* Sin animaciones: el circuito se muestra completo desde el inicio */
@media (prefers-reduced-motion: reduce) {
  .roots-line { stroke-dashoffset: 0; }
  .roots-node { transform: none; }
  .roots-pulse { display: none; }
}

.brand__sub {
  font-weight: 400;
  color: var(--c-text-muted);
}

/* ---------- Navegación ---------- */
.nav__list {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}

.nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  /* El espacio lateral se ajusta al ancho para que el menú quepa completo */
  padding: var(--sp-2) clamp(0.5rem, 0.1rem + 0.6vw, 0.875rem);
  font-size: 1.0625rem;
  font-weight: 500;
  white-space: nowrap;
  color: color-mix(in srgb, var(--c-text) 82%, transparent);
  transition: color var(--dur-fast) ease;
}

.nav__link:hover,
.nav__link.is-active {
  color: var(--c-text);
}

/* Punto indicador bajo el enlace activo */
.nav__link::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--c-accent);
  transform: translateX(-50%) scale(0);
  transition: transform var(--dur-med) var(--ease-out);
}

.nav__link.is-active::after {
  transform: translateX(-50%) scale(1);
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  position: relative;
  z-index: 2;
}

.site-header__cta {
  min-height: 48px;
  padding-inline: var(--sp-6);
}

.site-header .theme-toggle {
  width: 48px;
  min-height: 48px;
  border-color: var(--c-line-strong);
}

/* Iconos sol/luna del botón de tema */
.theme-toggle .icon-sun { display: none; }
:root[data-theme="light"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: none; }

/* ---------- Botón hamburguesa (solo móvil) ---------- */
.nav-toggle {
  display: none;
  width: 48px;
  height: 48px;
  border: 1px solid var(--c-line-strong);
  border-radius: var(--radius-xs);
  place-items: center;
}

.nav-toggle__bars {
  position: relative;
  width: 16px;
  height: 10px;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 1.5px;
  background: var(--c-text);
  transition: transform var(--dur-med) var(--ease-out), top var(--dur-med) var(--ease-out);
}

.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after  { top: calc(100% - 1.5px); }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  top: 50%;
  transform: translateY(-50%) rotate(-45deg);
}

/* ---------- Responsivo: menú móvil ---------- */
@media (max-width: 1279px) {
  .nav-toggle {
    display: grid;
  }

  /* backdrop-filter haría que el panel .nav (position: fixed) midiera solo lo
     que mide el header; sin él, el panel cubre toda la pantalla. */
  .site-header,
  .site-header.is-scrolled {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    background: color-mix(in srgb, var(--c-bg) 94%, transparent);
  }

  /* Logo y botones quedan por encima del panel abierto */
  .site-header .brand,
  .site-header .theme-toggle,
  .site-header .nav-toggle {
    position: relative;
    z-index: 2;
  }

  .site-header__cta {
    display: none;
  }

  .nav {
    position: fixed;
    inset: 0;
    z-index: 1;
    display: flex;
    align-items: center;
    padding: calc(var(--header-h) + var(--sp-6)) var(--gutter) var(--sp-6);
    background: var(--c-bg);
    clip-path: circle(0% at calc(100% - 40px) calc(var(--header-h) / 2));
    visibility: hidden;
    transition:
      clip-path var(--dur-slow) var(--ease-in-out),
      visibility 0s linear var(--dur-slow);
  }

  .nav.is-open {
    clip-path: circle(150% at calc(100% - 40px) calc(var(--header-h) / 2));
    visibility: visible;
    transition: clip-path var(--dur-slow) var(--ease-in-out), visibility 0s;
  }

  .nav__list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--sp-2);
    width: 100%;
  }

  .nav__link {
    font-family: var(--ff-display);
    font-size: var(--fs-xl);
    font-weight: 600;
    padding: var(--sp-2) 0;
    color: var(--c-text);
  }

  .nav__link::after {
    display: none;
  }

  /* Evita scroll del body con el menú abierto */
  body.nav-open {
    overflow: hidden;
  }
}

/* ---------- Ajustes del logo según el ancho ---------- */

/* Laptops (1280–1479px): solo el logo, para que el menú quepa completo */
@media (min-width: 1280px) and (max-width: 1479px) {
  .site-header .brand__name {
    display: none;
  }
}

/* Móvil: solo el logo, más chico */
@media (max-width: 700px) {
  .brand__logo {
    height: 30px;
  }

  .site-header .brand__name {
    display: none;
  }
}