/* ==========================================================================
   HEADER & MOBILE NAVBAR STYLES
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  padding: 16px 24px;
  z-index: 999;
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color, #333333);
  transition: background-color var(--transition, 0.4s ease);
}

body[data-theme="sepia"] .site-header { 
  background: rgba(244, 236, 216, 0.85); 
}

body[data-theme="high-contrast"] .site-header { 
  background: #000000; 
}

.navbar {
  max-width: 1240px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-heading-alt, 'Space Grotesk', sans-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--header-color, #ffd166);
  text-decoration: none;
  letter-spacing: 1px;
  transition: color var(--transition, 0.4s ease);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  position: relative;
  padding-bottom: 4px;
}

.logo::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 2px;
  background: var(--accent-primary, #c1121f);
}

.logo:hover {
  color: var(--accent-secondary, #ff6b35);
}

.nav-menu ul {
  list-style: none;
  display: flex;
  gap: 20px;
  align-items: center;
  margin: 0;
  padding: 0;
}

.nav-link {
  color: var(--text-color, #e8e8e8);
  text-decoration: none;
  font-family: var(--font-body-alt, 'DM Sans', sans-serif);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 4px 0;
  position: relative;
  transition: color var(--transition, 0.4s ease);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-primary, #c1121f);
  transition: width var(--transition, 0.4s ease);
}

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

.nav-link:hover, .nav-link.active {
  color: var(--accent-secondary, #ff6b35);
}

/* Hamburger Toggle for Mobile */
.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-color, #e8e8e8);
  transition: all var(--transition, 0.4s ease);
}

@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 70%;
    height: 100vh;
    background: rgba(13, 13, 13, 0.98);
    backdrop-filter: blur(15px);
    border-left: 1px solid var(--border-color, #333333);
    padding: 100px 30px 40px;
    transition: right 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 1000;
  }

  .nav-menu.active {
    right: 0;
  }

  .nav-menu ul {
    flex-direction: column;
    gap: 20px;
    align-items: flex-start;
  }

  .nav-link {
    font-size: 1.1rem;
    display: block;
    width: 100%;
  }

  .hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
    background: var(--accent-primary, #c1121f);
  }

  .hamburger.active span:nth-child(2) {
    opacity: 0;
  }

  .hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
    background: var(--accent-primary, #c1121f);
  }
}

/* ==========================================================================
   NEXT / PREVIOUS BOTTOM NAVIGATION STYLES
   ========================================================================== */
.bottom-page-nav {
  display: flex !important;
  justify-content: space-between !important;
  align-items: center !important;
  padding: 30px 0 !important;
  margin-top: 60px !important;
  border-top: 1px solid var(--border-color, #333333) !important;
  width: 100% !important;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.bottom-page-nav .btn-nav {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  background: var(--background-card, #1a1a1a);
  border: 1px solid var(--border-color, #333333);
  border-radius: var(--radius-md, 16px);
  color: var(--header-color, #ffd166);
  text-decoration: none;
  font-family: var(--font-body-alt, 'DM Sans', sans-serif);
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--transition, 0.4s ease);
  box-shadow: var(--shadow-sm, 0 4px 12px rgba(0,0,0,0.3));
}

.bottom-page-nav .btn-nav:hover {
  border-color: var(--accent-primary, #c1121f);
  color: #ffffff;
  background: var(--accent-primary, #c1121f);
  box-shadow: 0 0 15px var(--accent-glow, rgba(193, 18, 31, 0.4));
  transform: translateY(-3px);
}