/* Header Styling */
.site-header {
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--gray-200);
  padding: var(--space-4) 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: box-shadow var(--transition-base);
}

.site-header.scrolled {
  box-shadow: var(--shadow-sm);
}

.brand-logo {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
  white-space: nowrap;
}

/* Navigation */
.nav-menu {
  display: flex;
  align-items: center;
}

.nav-list {
  gap: var(--space-6);
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  position: relative;
  padding: var(--space-2) 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-primary);
  transition: width 0.3s ease;
}

.nav-link:hover::after {
  width: 100%;
}

/* Mobile Toggle */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  z-index: 1100;
}

.hamburger-box {
  width: 24px;
  height: 24px;
  display: inline-block;
  position: relative;
}

.hamburger-inner,
.hamburger-inner::before,
.hamburger-inner::after {
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: var(--radius-sm);
  position: absolute;
  transition: transform 0.15s ease;
}

.hamburger-inner {
  top: 50%;
  transform: translateY(-50%);
}

.hamburger-inner::before {
  content: '';
  top: -8px;
}

.hamburger-inner::after {
  content: '';
  bottom: -8px;
}

/* Mobile Responsive */
@media (max-width: 991px) {
  .mobile-toggle {
    display: block;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    max-width: 320px;
    background-color: var(--color-bg);
    padding: var(--space-16) var(--space-6) var(--space-6);
    flex-direction: column;
    align-items: flex-start;
    transform: translateX(100%);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: -5px 0 15px rgba(0,0,0,0.05);
    border-left: 1px solid var(--gray-200);
    visibility: hidden;
  }

  .nav-menu.is-active {
    transform: translateX(0);
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    width: 100%;
    align-items: flex-start;
    gap: var(--space-4);
  }

  .nav-link {
    font-size: var(--text-lg);
    display: block;
    width: 100%;
  }

  .nav-cta {
    margin-top: var(--space-4);
    width: 100%;
  }

  .nav-cta .btn {
    width: 100%;
  }

  /* Hamburger Animation */
  .mobile-toggle[aria-expanded="true"] .hamburger-inner {
    background-color: transparent;
  }

  .mobile-toggle[aria-expanded="true"] .hamburger-inner::before {
    transform: translateY(8px) rotate(45deg);
  }

  .mobile-toggle[aria-expanded="true"] .hamburger-inner::after {
    transform: translateY(-8px) rotate(-45deg);
  }
}