/* Header styles for "GET THE BEST" KAZI HASAN - build on base.css */

.grb-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(16px);
  background: linear-gradient(to bottom, rgba(15,23,42,0.96), rgba(15,23,42,0.92));
  border-bottom: 1px solid rgba(148,163,184,0.25);
}

.grb-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-3);
  gap: var(--space-4);
}

/* Brand */
.grb-header__brand {
  display: flex;
  align-items: center;
}

.grb-header__logo-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--gray-800);
}

.grb-header__logo-mark {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-xl);
  background: radial-gradient(circle at 30% 0, #f97316 0, #ea580c 35%, #0b1120 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-xs);
}

.grb-header__logo-icon {
  color: #0f172a;
  font-size: 1.1rem;
}

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

.grb-header__brand-name {
  font-family: var(--font-serif);
  font-weight: 650;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.95rem;
  color: var(--gray-900);
}

.grb-header__brand-tagline {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* Navigation */
.grb-header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.grb-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  list-style: none;
  padding: 0;
  margin: 0;
}

.grb-header__nav-link {
  position: relative;
  font-size: var(--font-size-sm);
  color: var(--gray-700);
  padding-block: 0.25rem;
}

.grb-header__nav-link::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  bottom: -0.35rem;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(to right, #f97316, #eab308);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--transition-normal);
}

.grb-header__nav-link:hover,
.grb-header__nav-link:focus-visible {
  color: var(--gray-900);
}

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

.grb-header__cta {
  margin-left: var(--space-3);
}

.grb-header__cta-button {
  font-size: var(--font-size-xs);
  padding-inline: 1rem;
  padding-block: 0.45rem;
}

/* Mobile toggle */
.grb-header__toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  color: var(--gray-700);
  border-radius: var(--radius-full);
  border: 1px solid rgba(148,163,184,0.55);
  padding-inline: 0.75rem;
  padding-block: 0.4rem;
  background-color: rgba(15,23,42,0.8);
}

.grb-header__toggle-text {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.grb-header__toggle-icon {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
}

.grb-header__toggle-line {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background-color: var(--gray-700);
  transition: transform var(--transition-normal), opacity var(--transition-fast), width var(--transition-fast);
}

/* Mobile menu state - toggled via JS */
.grb-header--menu-open .grb-header__toggle-line:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.grb-header--menu-open .grb-header__toggle-line:nth-child(2) {
  opacity: 0;
  width: 0;
}

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

/* Responsive */
@media (max-width: 960px) {
  .grb-header__inner {
    padding-block: var(--space-2);
  }

  .grb-header__toggle {
    display: inline-flex;
  }

  .grb-header__nav {
    position: fixed;
    inset-inline: 0;
    top: 60px;
    /* approximate header height */
    background: radial-gradient(circle at top, rgba(15,23,42,0.98) 0, rgba(2,6,23,0.98) 55%);
    border-top: 1px solid rgba(148,163,184,0.25);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-4) var(--container-padding-inline) var(--space-6);
    gap: var(--space-4);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition-normal), opacity var(--transition-normal);
  }

  .grb-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
  }

  .grb-header__nav-link {
    font-size: var(--font-size-base);
  }

  .grb-header__cta {
    margin-left: 0;
  }

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

@media (max-width: 640px) {
  .grb-header__brand-tagline {
    display: none;
  }
}