/* Header styles for "Di. Svitlana" Svitlana Perediela */

.mrf-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  backdrop-filter: blur(16px);
  background: linear-gradient(135deg, rgba(5, 7, 18, 0.9), rgba(15, 23, 42, 0.95));
  border-bottom: 1px solid rgba(148, 163, 184, 0.35);
}

.mrf-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-3);
}

.mrf-header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.mrf-header__logo-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text);
}

.mrf-header__logo-mark {
  width: 40px;
  height: 40px;
  border-radius: 999px;
  border: 1px solid rgba(180, 190, 255, 0.5);
  background:
    radial-gradient(circle at 30% 0%, rgba(127, 92, 255, 0.8), transparent 60%),
    radial-gradient(circle at 70% 100%, rgba(72, 187, 120, 0.65), transparent 60%),
    radial-gradient(circle at 50% 50%, rgba(5, 7, 12, 0.9), rgba(5, 7, 12, 1));
  box-shadow: 0 0 20px rgba(127, 92, 255, 0.7);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.mrf-header__rune {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  border: 1px solid rgba(248, 250, 252, 0.8);
  box-shadow: 0 0 12px rgba(248, 250, 252, 0.9);
  position: relative;
}

.mrf-header__rune::before,
.mrf-header__rune::after {
  content: "";
  position: absolute;
  inset: 3px;
  border-radius: 2px;
  border: 1px solid rgba(129, 140, 248, 0.9);
}

.mrf-header__rune::after {
  inset: 6px 7px;
  border-radius: 999px;
  border-color: rgba(56, 178, 172, 0.9);
}

.mrf-header__brand-text {
  display: flex;
  flex-direction: column;
}

.mrf-header__title {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 1.2vw + 0.9rem, 1.4rem);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.mrf-header__subtitle {
  font-size: var(--font-size-xs);
  color: var(--color-text-soft);
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

.mrf-header__nav {
  display: flex;
}

.mrf-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.mrf-header__nav-link {
  position: relative;
  font-size: var(--font-size-sm);
  text-transform: uppercase;

  color: var(--color-text-soft);
  padding-block: 0.25rem;
}

.mrf-header__nav-link::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  bottom: -0.25rem;
  height: 2px;
  border-radius: var(--radius-pill);
  background: linear-gradient(to right, var(--color-primary-strong), var(--color-success));
  transform-origin: center;
  transform: scaleX(0);
  transition: transform var(--transition-normal);
}

.mrf-header__nav-link:hover,
.mrf-header__nav-link:focus-visible {
  color: var(--color-text);
}

.mrf-header__nav-link:hover::after,
.mrf-header__nav-link:focus-visible::after {
  transform: scaleX(1);
}

.mrf-header__nav-item--cta .mrf-header__nav-link--cta {
  padding-inline: 1rem;
  padding-block: 0.4rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(129, 140, 248, 0.7);
  background: radial-gradient(circle at 0 0, rgba(127, 92, 255, 0.5), transparent 55%);
  box-shadow: var(--shadow-glow-primary);
  color: #fff;
}

.mrf-header__nav-item--cta .mrf-header__nav-link--cta::after {
  display: none;
}

.mrf-header__nav-item--cta .mrf-header__nav-link--cta:hover,
.mrf-header__nav-item--cta .mrf-header__nav-link--cta:focus-visible {
  border-color: rgba(246, 224, 94, 0.9);
  box-shadow: 0 0 28px rgba(246, 224, 94, 0.7);
}

/* Mobile toggle */

.mrf-header__toggle {
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(148, 163, 184, 0.6);
  background: radial-gradient(circle at 20% 0%, rgba(127, 92, 255, 0.35), transparent 60%),
    rgba(15, 23, 42, 0.98);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 0;
  color: var(--color-text);
}

.mrf-header__toggle-bar {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background-color: var(--color-text);
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.mrf-header__toggle-bar + .mrf-header__toggle-bar {
  margin-top: 4px;
}

.mrf-header__toggle:focus-visible {
  outline: 2px solid var(--color-warning);
  outline-offset: 3px;
}

.mrf-header--menu-open .mrf-header__toggle-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.mrf-header--menu-open .mrf-header__toggle-bar:nth-child(2) {
  opacity: 0;
}

.mrf-header--menu-open .mrf-header__toggle-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Mobile layout */

@media (max-width: 768px) {
  .mrf-header__inner {
    padding-block: var(--space-2);
  }

  .mrf-header__subtitle {
    display: none;
  }

  .mrf-header__toggle {
    display: inline-flex;
    flex-direction: column;
  }

  .mrf-header__nav {
    position: fixed;
    inset-inline: 0;
    top: 56px;
    background: radial-gradient(circle at 0 0, rgba(127, 92, 255, 0.25), transparent 60%),
      radial-gradient(circle at 100% 100%, rgba(72, 187, 120, 0.2), transparent 60%),
      rgba(5, 7, 18, 0.98);
    border-bottom: 1px solid rgba(148, 163, 184, 0.4);
    transform: translateY(-120%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition-normal), opacity var(--transition-normal), visibility var(--transition-normal);
  }

  .mrf-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-4) var(--layout-gutter) var(--space-6);
    gap: var(--space-3);
  }

  .mrf-header--menu-open .mrf-header__nav {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .mrf-header__nav-link {
    font-size: var(--font-size-md);
  }
}

@media (prefers-reduced-motion: reduce) {
  .mrf-header__nav,
  .mrf-header__toggle-bar {
    transition: none;
  }
}