/* Header styles for Sport Buying */

.sb-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  background: linear-gradient(to bottom, rgba(5, 8, 22, 0.95), rgba(5, 8, 22, 0.88));
  border-bottom: 1px solid var(--color-border-subtle);
}

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

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

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

.sb-header__logo-mark {
  position: relative;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-full);
  background: radial-gradient(circle at 30% 20%, rgba(37, 99, 235, 0.9), transparent 55%),
              radial-gradient(circle at 70% 80%, rgba(34, 197, 94, 0.9), transparent 55%),
              var(--color-surface-alt);
  box-shadow: 0 0 0 1px rgba(148, 163, 184, 0.35), var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.sb-header__logo-orbit {
  position: absolute;
  width: 82%;
  height: 82%;
  border-radius: var(--radius-full);
  border: 2px solid rgba(249, 250, 251, 0.78);
  border-top-color: rgba(37, 99, 235, 0.3);
  border-right-color: rgba(34, 197, 94, 0.3);
}

.sb-header__logo-core {
  width: 34%;
  height: 34%;
  border-radius: var(--radius-full);
  background: #ffffff;
}

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

.sb-header__site-name {
  font-family: var(--font-heading);
  font-size: var(--font-size-lg);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.sb-header__tagline {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

/* Navigation */
.sb-header__nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-6);
}

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

.sb-header__nav-link {
  position: relative;
  padding: 0.25rem 0;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-muted);
}

.sb-header__nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.2rem;
  width: 0;
  height: 2px;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transition: width var(--transition-base);
}

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

.sb-header__nav-link:hover::after,
.sb-header__nav-link:focus-visible::after {
  width: 60%;
}

.sb-header__cta-group {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.sb-header__support-btn {
  font-size: var(--font-size-xs);
  padding-inline: 0.9rem;
}

.sb-header__shop-btn {
  font-size: var(--font-size-xs);
}

/* Mobile menu toggle */
.sb-header__menu-toggle {
  display: none;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border-subtle);
  background: rgba(15, 23, 42, 0.96);
  color: var(--color-text);
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.sb-header__menu-toggle-icon {
  position: relative;
  width: 18px;
  height: 14px;
}

.sb-header__bar {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  border-radius: var(--radius-full);
  background: var(--gray-200);
  transition: transform var(--transition-base), opacity var(--transition-base), top var(--transition-base), bottom var(--transition-base);
}

.sb-header__bar--top {
  top: 0;
}

.sb-header__bar--middle {
  top: 50%;
  transform: translateY(-50%);
}

.sb-header__bar--bottom {
  bottom: 0;
}

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

.sb-header__menu-toggle[aria-expanded="true"] .sb-header__bar--middle {
  opacity: 0;
}

.sb-header__menu-toggle[aria-expanded="true"] .sb-header__bar--bottom {
  bottom: auto;
  top: 50%;
  transform: translateY(-50%) rotate(-45deg);
}

.sb-header__menu-toggle-text {
  text-transform: uppercase;
}

/* Responsive behaviour */
@media (max-width: 960px) {
  .sb-header__inner {
    gap: var(--space-2);
  }

  .sb-header__menu-toggle {
    display: inline-flex;
  }

  .sb-header__nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    margin-top: 0;
    background: radial-gradient(circle at top, rgba(37, 99, 235, 0.2), transparent 55%), var(--color-surface);
    border-bottom: 1px solid var(--color-border-subtle);
    box-shadow: var(--shadow-md);
    flex-direction: column;
    align-items: stretch;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transform: translateY(-8px);
    transition: max-height var(--transition-slow), opacity var(--transition-base), transform var(--transition-base);
  }

  .sb-header__nav--open {
    max-height: 520px;
    opacity: 1;
    transform: translateY(0);
  }

  .sb-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-4);
    padding-bottom: var(--space-2);
    gap: var(--space-2);
  }

  .sb-header__nav-link {
    width: 100%;
    padding-block: 0.4rem;
  }

  .sb-header__cta-group {
    padding: 0 var(--space-4) var(--space-4);
    border-top: 1px solid var(--color-border-subtle);
    justify-content: flex-start;
  }

  .sb-header__shop-btn {
    flex: 1;
    justify-content: center;
  }
}

@media (max-width: 600px) {
  .sb-header__logo-mark {
    width: 36px;
    height: 36px;
  }

  .sb-header__site-name {
    font-size: var(--font-size-md);
  }

  .sb-header__tagline {
    display: none;
  }

  .sb-header__support-btn {
    display: none;
  }
}

/* Utility when JS is disabled – keep nav visible */
@supports not (backdrop-filter: blur(1px)) {
  .sb-header {
    background: var(--color-bg);
  }
}