/* Header */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-secondary);
  height: var(--header-h);
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}

nav {
  max-width: 1200px;
  height: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  padding: 0 1rem;
  gap: 1rem;
  justify-content: space-between; /* Ensure space between logo and links */
}

/* Mobile bottom nav - REMOVED */

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
}

.logo img {
  filter: var(--logo-filter-light);
  transition: filter 0.3s ease;
  height: 50px;
}

.header-spacer {
  margin-left: auto;
}

.nav-links a {
  transition: all 0.3s ease;
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.desktop-only a {
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
}

.desktop-only a:hover {
  background: var(--accent-primary);
  color: var(--bg-primary);
}

/* Social Links */
.social-links {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0; /* Prevent social links from shrinking */
}

.social-links a {
  color: var(--text-secondary);
  font-size: 24px; /* Increased size */
  transition: color 0.3s ease, transform 0.3s ease;
}

.social-links a:hover {
  color: var(--accent-primary);
  transform: scale(1.2) rotate(10deg); /* More noticeable hover */
}

/* Header Separator */
.header-separator {
  display: none;
}

/* --- New Mobile Navigation --- */
.hamburger-btn {
  display: none; /* Hidden by default */
  background: none;
  border: none;
  cursor: pointer;
  padding: 16px;
  margin: -16px; /* Negative margin to make padding the hit area */
  z-index: 1100;
  position: relative;
}

.hamburger-icon {
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  position: relative;
  transition: transform 0.3s ease, background-color 0.3s ease;
}

.hamburger-icon::before,
.hamburger-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--text-primary);
  transition: transform 0.3s ease, top 0.3s ease;
}

.hamburger-icon::before {
  top: -8px;
}

.hamburger-icon::after {
  top: 8px;
}

.mobile-menu-is-open .hamburger-icon {
  background-color: transparent; /* Middle bar disappears */
}

.mobile-menu-is-open .hamburger-icon::before {
  transform: rotate(45deg);
  top: 0;
}

.mobile-menu-is-open .hamburger-icon::after {
  transform: rotate(-45deg);
  top: 0;
}

.mobile-menu-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 1040;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.24s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.mobile-menu-is-open .mobile-menu-backdrop {
  opacity: 1;
  visibility: visible;
}

.mobile-menu-close {
  position: absolute;
  top: 20px;
  right: 20px;
  background: none;
  border: none;
  font-size: 28px;
  color: var(--text-primary);
  cursor: pointer;
  z-index: 1060;
  padding: 0; /* Remove default button padding */
  width: 44px; /* Accessible tap target */
  height: 44px; /* Accessible tap target */
  display: flex;
  align-items: center;
  justify-content: center;
}

.mobile-only {
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  background: var(--bg-primary);
  z-index: 1050;
  padding: 20px;
  padding-top: calc(20px + env(safe-area-inset-top));
  padding-left: calc(20px + env(safe-area-inset-left));
  transform: translateX(-100%);
  transition: transform 0.24s cubic-bezier(0.2, 0.8, 0.2, 1);
  overflow-y: auto; /* Added for scroll functionality */
}

.mobile-menu-is-open .mobile-only {
  transform: translateX(0);
}

.mobile-only a {
  font-size: 20px; /* Increased size from 18px */
  line-height: 20px;
  color: var(--text-primary);
  padding: 16px 0;
  min-height: 44px; /* Accessible tap target */
  border-bottom: 1px solid var(--border-secondary);
}

.mobile-only a:first-child {
  padding-top: 20px;
}

.mobile-social-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  padding: 20px 0;
  margin-top: auto; /* Pushes social links to the bottom */
  border-top: 1px solid var(--border-secondary);
}

.mobile-social-links a {
  font-size: 32px; /* Increased size from 28px */
  color: var(--accent-primary);
  transition: transform 0.3s ease;
}

.mobile-social-links a:hover {
  transform: scale(1.1);
}