/* ============================================
   MODERN STICKY NAVIGATION
   Mobile-first, accessible, performant
   ============================================ */

/* === HEADER STRUCTURE === */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1001;
  background-color: var(--color-bg-elevated);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border-light);
  transition: all var(--transition-base);
  box-shadow: 0 1px 3px var(--color-shadow-sm);
}

/* When menu is open, keep header visible on mobile */
@media (max-width: 1023px) {
  .site-header.menu-is-open {
    background-color: var(--color-bg-elevated);
    z-index: 1001;
  }
}

/* Hide header on scroll down, show on scroll up */
.site-header.hidden {
  transform: translateY(-100%);
}

/* Add shadow when scrolled */
.site-header.scrolled {
  box-shadow: 0 2px 8px var(--color-shadow-md);
}

/* Header Container */
.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-4);
  height: 80px;
}

@media (min-width: 768px) {
  .header-container {
    height: 110px;
    padding: 0 var(--space-8);
  }
}

@media (min-width: 1200px) {
  .header-container {
    padding: 0 var(--space-12);
  }
}

/* === LOGO === */

.logo {
  display: flex;
  align-items: center;
  z-index: 1002;
  flex-shrink: 0;
}

.logo a {
  display: flex;
  align-items: center;
  line-height: 0;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.logo a:hover {
  background: var(--color-surface-hover);
}

.logo img {
  height: 55px;
  width: auto;
  object-fit: contain;
  transition: all var(--transition-base);
  filter: brightness(1);
}

@media (min-width: 768px) {
  .logo img {
    height: 85px;
  }
}

[data-theme="dark"] .logo img {
  filter: brightness(1.1);
}

.logo a:hover img {
  transform: scale(1.03);
}


/* === NAVIGATION MENU === */

.main-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: 100vh;
  background: var(--color-bg-elevated);
  padding: 80px var(--space-6) var(--space-6);
  display: block;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 999;
  overflow-y: auto;
}

/* Mobile menu open state */
.main-nav.active {
  opacity: 1;
  visibility: visible;
}

/* Add "Menu" title at the top */
.main-nav::before {
  content: 'Menu';
  position: absolute;
  top: 30px;
  left: var(--space-6);
  font-family: var(--font-body);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text-primary);
  letter-spacing: 0.5px;
}

/* Close button in the top right */
.main-nav::after {
  display: none;
}

@media (min-width: 1024px) {
  .main-nav {
    position: static;
    width: auto;
    height: auto;
    background: transparent;
    backdrop-filter: none;
    padding: 0;
    display: block;
    opacity: 1;
    visibility: visible;
    overflow-y: visible;
  }
  
  .main-nav::before {
    display: none;
  }
}

/* Navigation list */
.main-nav ul {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0;
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: 500px;
}

@media (min-width: 1024px) {
  .main-nav ul {
    flex-direction: row;
    gap: var(--space-10);
    align-items: center;
    max-width: none;
  }
}

.main-nav li {
  margin: 0;
  width: 100%;
  border-bottom: 1px solid var(--color-border-light);
  opacity: 0;
  transform: translateX(-20px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.main-nav li:last-child {
  border-bottom: none;
}

/* Staggered animation for menu items */
.main-nav.active li {
  opacity: 1;
  transform: translateX(0);
}

.main-nav.active li:nth-child(1) { transition-delay: 0.05s; }
.main-nav.active li:nth-child(2) { transition-delay: 0.1s; }
.main-nav.active li:nth-child(3) { transition-delay: 0.15s; }
.main-nav.active li:nth-child(4) { transition-delay: 0.2s; }
.main-nav.active li:nth-child(5) { transition-delay: 0.25s; }

@media (min-width: 1024px) {
  .main-nav li {
    width: auto;
    opacity: 1;
    transform: translateX(0);
    border-bottom: none;
  }
}

/* Navigation links */
.main-nav a {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  width: 100%;
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-text-primary);
  letter-spacing: 0.3px;
  position: relative;
  padding: var(--space-4) var(--space-5);
  transition: all var(--transition-base);
  text-decoration: none;
  border-radius: var(--radius-md);
  background: transparent;
}

/* Add icons before each link */
.main-nav a::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 24px;
  margin-right: var(--space-4);
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  opacity: 0.7;
  transition: opacity var(--transition-base);
  flex-shrink: 0;
}

/* Home icon */
.main-nav a[href="index.html"]::before,
.main-nav a[href="./index.html"]::before,
.main-nav a[href="/"]::before {
  content: '🏠';
  font-size: 20px;
  background: none;
}

/* Portfolio icon */
.main-nav a[href="work.html"]::before,
.main-nav a[href*="portfolio"]::before {
  content: '📁';
  font-size: 20px;
  background: none;
}

/* About icon */
.main-nav a[href="about.html"]::before,
.main-nav a[href*="about"]::before {
  content: 'ℹ️';
  font-size: 20px;
  background: none;
}

/* Services icon */
.main-nav a[href="services.html"]::before,
.main-nav a[href*="services"]::before {
  content: '⚙️';
  font-size: 20px;
  background: none;
}

/* Contact icon */
.main-nav a[href="contact.html"]::before,
.main-nav a[href*="contact"]::before {
  content: '✉️';
  font-size: 20px;
  background: none;
}

@media (min-width: 1024px) {
  .main-nav a {
    width: auto;
    font-size: var(--font-size-sm);
    padding: var(--space-2) var(--space-3);
  }
  
  .main-nav a::before {
    display: none;
  }
}

/* No underline effect on mobile */
.main-nav a::after {
  display: none;
}

@media (min-width: 1024px) {
  .main-nav a::after {
    content: '';
    display: block;
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-gold);
    transition: width var(--transition-base);
  }
  
  .main-nav a:hover::after,
  .main-nav a.active::after {
    width: 100%;
  }
}

.main-nav a:hover {
  color: var(--color-gold);
  background: var(--color-surface-hover);
}

.main-nav a:hover::before {
  opacity: 1;
}

/* Active link state */
.main-nav a.active {
  color: var(--color-gold);
  font-weight: 500;
  background: var(--color-surface-hover);
}

.main-nav a.active::before {
  opacity: 1;
}

/* === MOBILE MENU TOGGLE === */

.mobile-menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
  width: 44px;
  height: 44px;
  padding: 8px;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  z-index: 1002;
  position: relative;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.mobile-menu-toggle:hover {
  background: var(--color-surface-hover);
}

.mobile-menu-toggle:active {
  transform: scale(0.95);
}

@media (min-width: 1024px) {
  .mobile-menu-toggle {
    display: none;
  }
}

/* Hamburger lines */
.mobile-menu-toggle span {
  display: block;
  width: 24px;
  height: 2.5px;
  background-color: var(--color-text-primary);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  transform-origin: center;
  border-radius: 2px;
}

/* Animated hamburger to X */
.mobile-menu-toggle.active span:nth-child(1) {
  transform: translateY(8.5px) rotate(45deg);
}

.mobile-menu-toggle.active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.mobile-menu-toggle.active span:nth-child(3) {
  transform: translateY(-8.5px) rotate(-45deg);
}

/* === OVERLAY FOR MOBILE MENU === */
/* Now the menu itself is the overlay, so we hide this element */

.menu-overlay {
  display: none;
}

/* === THEME TOGGLE IN NAVIGATION === */

.nav-theme-toggle {
  list-style: none;
  margin: 0;
  padding: 0;
}

@media (min-width: 1024px) {
  .nav-theme-toggle {
    margin-left: var(--space-4);
  }
}

.nav-theme-toggle .theme-toggle {
  width: 40px;
  height: 40px;
}

/* Add margin to body for fixed header */
body {
  padding-top: 80px;
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
}

@media (min-width: 768px) {
  body {
    padding-top: 110px;
  }
}

/* Remove pulse animation */

/* === PREVENT BODY SCROLL WHEN MOBILE MENU OPEN === */

body.menu-open {
  overflow: hidden;
}

@media (min-width: 1024px) {
  body.menu-open {
    overflow: auto;
  }
}