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

.rf-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(22px) saturate(160%);
  -webkit-backdrop-filter: blur(22px) saturate(160%);
  background: linear-gradient(180deg, rgba(5, 6, 10, 0.96), rgba(5, 6, 10, 0.86));
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.rf-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
  min-height: var(--nav-height);
}

/* Brand */
.rf-header__brand {
  display: flex;
  align-items: center;
  min-width: 0;
}

.rf-header__logo-link {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.rf-header__logo-mark {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: radial-gradient(circle at 20% 0%, rgba(255, 255, 255, 0.3), transparent 55%),
              conic-gradient(from 210deg, var(--color-primary), var(--color-accent), var(--color-primary));
  box-shadow: var(--shadow-glow-red);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.rf-header__logo-mark::after {
  content: "";
  position: absolute;
  inset: 3px;
  border-radius: 10px;
  background: radial-gradient(circle at 50% 0%, rgba(255, 255, 255, 0.3), transparent 40%),
              radial-gradient(circle at 0% 100%, rgba(0, 200, 83, 0.4), transparent 55%),
              radial-gradient(circle at 100% 100%, rgba(229, 57, 53, 0.4), transparent 55%);
  mix-blend-mode: screen;
}

.rf-header__logo-rune {
  position: relative;
  width: 18px;
  height: 24px;
  border-radius: 8px;
  border: 2px solid rgba(255, 255, 255, 0.9);
  box-shadow: 0 0 12px rgba(255, 255, 255, 0.8);
}

.rf-header__logo-rune::before,
.rf-header__logo-rune::after {
  content: "";
  position: absolute;
  inset: 4px;
  border-radius: 6px;
  border: 1px solid rgba(0, 200, 83, 0.9);
  box-shadow: 0 0 10px rgba(0, 200, 83, 0.8);
}

.rf-header__logo-rune::after {
  inset: 7px 6px 3px 6px;
  border-color: rgba(229, 57, 53, 0.95);
  box-shadow: 0 0 10px rgba(229, 57, 53, 0.85);
}

.rf-header__logo-text {
  display: flex;
  flex-direction: column;
}

.rf-header__logo-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gray-50);
}

.rf-header__logo-subtitle {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--color-text-muted);
}

/* Toggle */
.rf-header__toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0.4rem 0.7rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(3, 6, 14, 0.9);
  color: var(--gray-50);
  cursor: pointer;
}

.rf-header__toggle:focus-visible {
  outline: 2px solid var(--color-accent-strong);
  outline-offset: 3px;
}

.rf-header__toggle-box {
  width: 20px;
  height: 18px;
  position: relative;
}

.rf-header__toggle-line {
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transition: transform var(--transition-normal), opacity var(--transition-normal), top var(--transition-normal), bottom var(--transition-normal);
}

.rf-header__toggle-line--top {
  top: 2px;
}

.rf-header__toggle-line--middle {
  top: 8px;
}

.rf-header__toggle-line--bottom {
  bottom: 2px;
}

.rf-header__toggle-text {
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

/* Nav */
.rf-header__nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-10);
}

.rf-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  list-style: none;
}

.rf-header__nav-item--highlight .rf-header__nav-link {
  position: relative;
  color: var(--color-accent-strong);
}

.rf-header__nav-item--highlight .rf-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.35rem;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-primary));
  opacity: 0.75;
}

.rf-header__nav-link {
  position: relative;
  font-size: 0.9rem;
  font-weight: 500;

  text-transform: uppercase;
  color: var(--color-text-muted);
  padding: 0.25rem 0;
}

.rf-header__nav-link::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.3rem;
  height: 1px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transform-origin: center;
  transform: scaleX(0);
  opacity: 0;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.rf-header__nav-link:hover,
.rf-header__nav-link:focus-visible {
  color: var(--gray-50);
}

.rf-header__nav-link:hover::before,
.rf-header__nav-link:focus-visible::before {
  transform: scaleX(1);
  opacity: 1;
}

.rf-header__cta-group {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.rf-header__cta {
  font-size: 0.75rem;
}

.rf-header__cta--secondary {
  display: none;
}

.rf-header__shadow {
  position: absolute;
  inset-inline: 0;
  bottom: -14px;
  height: 14px;
  background: radial-gradient(ellipse at center, rgba(0, 0, 0, 0.8), transparent 70%);
  opacity: 0.75;
}

/* Mobile layout */
@media (max-width: 767.98px) {
  .rf-header__inner {
    gap: var(--space-4);
  }

  .rf-header__logo-subtitle {
    display: none;
  }

  .rf-header__nav {
    position: fixed;
    inset-inline: 0;
    top: var(--nav-height);
    bottom: 0;
    background: radial-gradient(circle at 0 0, rgba(229, 57, 53, 0.14), transparent 60%),
                radial-gradient(circle at 100% 100%, rgba(0, 200, 83, 0.16), transparent 60%),
                rgba(5, 6, 14, 0.98);
    flex-direction: column;
    align-items: flex-start;
    justify-content: space-between;
    padding: var(--space-16) var(--space-8) var(--space-16);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--transition-normal), transform var(--transition-normal), visibility var(--transition-normal);
  }

  .rf-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-6);
  }

  .rf-header__nav-link {
    font-size: 0.95rem;
  }

  .rf-header__cta-group {
    width: 100%;
    flex-direction: column-reverse;
    align-items: stretch;
  }

  .rf-header__cta--secondary {
    display: inline-flex;
  }

  .rf-header--menu-open .rf-header__nav {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .rf-header--menu-open .rf-header__toggle-line--top {
    top: 8px;
    transform: rotate(45deg);
  }

  .rf-header--menu-open .rf-header__toggle-line--middle {
    opacity: 0;
  }

  .rf-header--menu-open .rf-header__toggle-line--bottom {
    bottom: 8px;
    transform: rotate(-45deg);
  }
}

/* Medium+ screens */
@media (min-width: 768px) {
  .rf-header__toggle {
    display: none;
  }

  .rf-header__cta--secondary {
    display: inline-flex;
  }
}

/* Large screens */
@media (min-width: 1024px) {
  .rf-header__nav-list {
    gap: var(--space-8);
  }

  .rf-header__cta-group {
    gap: var(--space-5);
  }
}