:root {
  --header-height: 6.25rem;
  --header-height-mobile: 5.4rem;
}

html {
  scroll-padding-top: calc(var(--header-height) + 1rem);
}

html.menu-open {
  overscroll-behavior: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 9000;
  width: 100%;
  isolation: isolate;
  color: var(--color-white);
  background: var(--color-transparent);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--color-primary);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  pointer-events: none;
  transition:
    background-color 280ms ease,
    border-color 280ms ease,
    box-shadow 280ms ease,
    backdrop-filter 280ms ease;
}

.site-header.is-scrolled::before {
  background: rgba(39, 46, 56, 0.94);
  border-bottom-color: rgba(255, 255, 255, 0.16);
  box-shadow: 0 12px 34px rgba(0, 0, 0, 0.14);
  backdrop-filter: blur(16px) saturate(1.15);
  -webkit-backdrop-filter: blur(16px) saturate(1.15);
}

.site-header__container {
  width: min(100%, calc(var(--container-width) + var(--container-padding) * 2));
  height: var(--header-height);
  margin-inline: auto;
  padding-inline: var(--container-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(1.5rem, 4vw, 3rem);
}

.site-header__brand {
  position: relative;
  z-index: 3;
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.site-header__logo {
  width: 5rem;
  height: 5rem;
  display: block;
  object-fit: contain;
  transform-origin: center;
  transition:
    transform 260ms cubic-bezier(0.22, 1, 0.36, 1),
    opacity var(--transition-fast);
}

.site-header__nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: clamp(1.15rem, 2.4vw, 2rem);
}

.site-header__links {
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2vw, 1.8rem);
  list-style: none;
}

.site-header__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  color: rgba(255, 255, 255, 0.82);
  font-family: var(--font-body);
  font-size: 0.84rem;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
  transition:
    color var(--transition-fast),
    transform var(--transition-fast);
}

.site-header__link--button {
  margin: 0;
  padding: 0;
  border: 0;
  background: none;
  appearance: none;
  cursor: pointer;
}

.site-header__link::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0.35rem;
  left: 0;
  height: 2px;
  border-radius: var(--radius-full);
  background: var(--color-secondary);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 260ms cubic-bezier(0.22, 1, 0.36, 1);
}

.site-header__link.is-active,
.site-header__link[aria-current="true"] {
  color: var(--color-white);
}

.site-header__link.is-active::after,
.site-header__link[aria-current="true"]::after {
  transform: scaleX(1);
}

.site-header__cta {
  flex: 0 0 auto;
  min-height: 2.9rem;
  padding: 0.82rem 1.2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  color: var(--color-white);
  background: var(--color-secondary);
  box-shadow: 0 10px 28px rgba(226, 74, 35, 0.24);
  font-size: 0.84rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
  transition:
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

.site-header__toggle {
  position: relative;
  z-index: 3;
  width: 3rem;
  height: 3rem;
  margin: 0;
  padding: 0;
  display: none;
  place-items: center;
  border: 1px solid var(--color-border-light-soft);
  border-radius: var(--radius-full);
  color: var(--color-white);
  background: rgba(0, 0, 0, 0.16);
  appearance: none;
  cursor: pointer;
  touch-action: manipulation;
  transition:
    border-color var(--transition-fast),
    background-color var(--transition-fast),
    transform var(--transition-fast);
}

.site-header__toggle-lines {
  position: relative;
  width: 1.25rem;
  height: 1rem;
  display: block;
}

.site-header__toggle-line {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  border-radius: var(--radius-full);
  background: currentColor;
  transform-origin: center;
  transition:
    top 280ms cubic-bezier(0.22, 1, 0.36, 1),
    transform 280ms cubic-bezier(0.22, 1, 0.36, 1),
    opacity 180ms ease;
}

.site-header__toggle-line:nth-child(1) {
  top: 0;
}

.site-header__toggle-line:nth-child(2) {
  top: calc(50% - 1px);
}

.site-header__toggle-line:nth-child(3) {
  top: calc(100% - 2px);
}

.site-header__toggle[aria-expanded="true"]
  .site-header__toggle-line:nth-child(1) {
  top: calc(50% - 1px);
  transform: rotate(45deg);
}

.site-header__toggle[aria-expanded="true"]
  .site-header__toggle-line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0.2);
}

.site-header__toggle[aria-expanded="true"]
  .site-header__toggle-line:nth-child(3) {
  top: calc(50% - 1px);
  transform: rotate(-45deg);
}

.site-header__backdrop {
  position: fixed;
  top: var(--header-height-mobile);
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 1;
  display: none;
  background: rgba(0, 0, 0, 0.48);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition:
    opacity 300ms ease,
    visibility 300ms ease;
}

@media (hover: hover) and (pointer: fine) {
  .site-header__brand:hover .site-header__logo {
    transform: scale(1.045);
  }

  .site-header__link:hover {
    color: var(--color-white);
    transform: translateY(-1px);
  }

  .site-header__link:hover::after {
    transform: scaleX(1);
  }

  .site-header__cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 34px rgba(226, 74, 35, 0.3);
  }

  .site-header__toggle:hover {
    border-color: var(--color-border-light-strong);
    background: rgba(0, 0, 0, 0.28);
  }
}

.site-header__cta:active,
.site-header__toggle:active {
  transform: translateY(0);
}

/* ================================
   Tablet / navegación compacta
   ================================ */

@media (max-width: 1100px) {
  .site-header__logo {
    width: 4.75rem;
    height: 4.75rem;
  }
}

@media (max-width: 980px) {
  .site-header__nav {
    gap: 1rem;
  }

  .site-header__links {
    gap: 0.85rem;
  }

  .site-header__link {
    font-size: 0.8rem;
  }

  .site-header__cta {
    padding-inline: 1rem;
    font-size: 0.8rem;
  }

  .site-header__logo {
    width: 4.55rem;
    height: 4.55rem;
  }
}

/* ================================
   Menú mobile
   ================================ */

@media (max-width: 820px) {
  :root {
    --header-height: var(--header-height-mobile);
  }

  html {
    scroll-padding-top: calc(var(--header-height-mobile) + 1rem);
  }

  html.menu-open .site-header {
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
  }

  .site-header__container {
    height: var(--header-height-mobile);
  }

  .site-header__logo {
    width: 4.25rem;
    height: 4.25rem;
  }

  .js .site-header__toggle {
    display: grid;
  }

  .site-header__backdrop {
    display: block;
  }

  .js .site-header__nav {
    position: fixed;
    top: var(--header-height-mobile);
    right: 0;
    z-index: 2;
    width: min(88vw, 24rem);
    height: calc(100dvh - var(--header-height-mobile));
    margin: 0;
    padding: clamp(2rem, 7vh, 4rem) clamp(1.5rem, 6vw, 2rem)
      max(2rem, env(safe-area-inset-bottom));
    display: flex;
    align-items: stretch;
    justify-content: flex-start;
    flex-direction: column;
    gap: 2rem;
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
    color: var(--color-white);
    background: rgba(39, 46, 56, 0.98);
    border-left: 1px solid rgba(255, 255, 255, 0.12);
    box-shadow: -22px 0 60px rgba(0, 0, 0, 0.18);
    transform: translate3d(100%, 0, 0);
    visibility: hidden;
    pointer-events: none;
    transition:
      transform 420ms cubic-bezier(0.22, 1, 0.36, 1),
      visibility 420ms ease;
  }

  .js .site-header.is-menu-open .site-header__nav {
    transform: translate3d(0, 0, 0);
    visibility: visible;
    pointer-events: auto;
  }

  .site-header.is-menu-open .site-header__backdrop {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .site-header__links {
    width: 100%;
    display: grid;
    align-items: stretch;
    gap: 0;
  }

  .site-header__links li {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  .site-header__link {
    width: 100%;
    min-height: 3.75rem;
    justify-content: flex-start;
    color: rgba(255, 255, 255, 0.84);
    font-size: 0.9rem;
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: 0.055em;
  }

  .site-header__link::after {
    top: 50%;
    right: auto;
    bottom: auto;
    left: 0;
    width: 3px;
    height: 1.35rem;
    transform: translateY(-50%) scaleY(0);
    transform-origin: center;
  }

  .site-header__link.is-active,
  .site-header__link[aria-current="true"] {
    padding-left: 0.9rem;
  }

  .site-header__link.is-active::after,
  .site-header__link[aria-current="true"]::after {
    transform: translateY(-50%) scaleY(1);
  }

  .site-header__cta {
    width: 100%;
    min-height: 3.35rem;
    margin-top: auto;
    font-size: 0.88rem;
  }

  /*
   * Progressive enhancement:
   * si JavaScript falla, el menú continúa siendo accesible.
   */

  html:not(.js) .site-header {
    position: relative;
  }

  html:not(.js) .site-header__container {
    height: auto;
    min-height: var(--header-height-mobile);
    padding-block: 0.75rem;
    align-items: flex-start;
    flex-wrap: wrap;
  }

  html:not(.js) .site-header__nav {
    width: 100%;
    margin: 0;
    padding-bottom: 0.75rem;
    display: grid;
  }
}

@media (max-width: 560px) {
  .site-header__container {
    padding-inline: 1rem;
  }

  .site-header__logo {
    width: 4.05rem;
    height: 4.05rem;
  }

  .site-header__toggle {
    width: 3rem;
    height: 3rem;
  }

  .js .site-header__nav {
    width: min(92vw, 22rem);
    padding-inline: 1.35rem;
  }

  .site-header__link {
    font-size: 0.84rem;
  }
}

@media (max-width: 380px) {
  .site-header__logo {
    width: 3.85rem;
    height: 3.85rem;
  }

  .js .site-header__nav {
    width: 94vw;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header,
  .site-header::before,
  .site-header__logo,
  .site-header__link,
  .site-header__link::after,
  .site-header__cta,
  .site-header__toggle,
  .site-header__toggle-line,
  .site-header__nav,
  .site-header__backdrop {
    transition: none;
  }
}