/* ============================================
   HEADER SYSTEM - Awwwards Premium Design
   Full-screen overlay mobile menu
   ============================================ */

/* CSS Variables for Header */
:root {
  --header-height: 80px;
  --header-bg-transparent: rgba(10, 10, 10, 0.8);
  --header-bg-scrolled: rgba(10, 10, 10, 0.95);
  --header-blur: blur(20px);
  --overlay-bg: rgba(0, 0, 0, 0.98);
  --overlay-blur: blur(40px);
  --menu-item-spacing: 48px;
  --menu-font-size: clamp(2rem, 5vw, 3.5rem);
  --menu-font-weight: 700;
  --transition-menu: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --transition-header: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --header-bg-transparent: rgba(255, 255, 255, 0.8);
  --header-bg-scrolled: rgba(255, 255, 255, 0.95);
  --overlay-bg: rgba(255, 255, 255, 0.98);
}

/* ============================================
   HEADER - Fixed/Sticky with Blur
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  width: 100%;
  background: var(--header-bg-transparent);
  backdrop-filter: var(--header-blur);
  -webkit-backdrop-filter: var(--header-blur);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  transition: background var(--transition-header),
              backdrop-filter var(--transition-header),
              box-shadow var(--transition-header);
  will-change: background, backdrop-filter;
  box-sizing: border-box;
}

[data-theme="light"] .header {
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.header.scrolled {
  background: var(--header-bg-scrolled);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.2);
}

[data-theme="light"] .header.scrolled {
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}

/* ============================================
   HEADER CONTENT - Logo Left, Menu Right
   ============================================ */
.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  width: 100%;
  padding: 0 var(--space-6);
  max-width: 100%;
  margin: 0;
  flex-wrap: nowrap;
  gap: var(--space-6);
  box-sizing: border-box;
}

/* Logo */
.logo {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
  text-decoration: none;
  transition: transform var(--transition-fast);
  z-index: 1001;
  flex-shrink: 0;
  white-space: nowrap;
}

.logo:hover {
  transform: scale(1.05);
}

/* Desktop Navigation */
.desktop-nav {
  display: flex !important;
  align-items: center;
  flex-shrink: 0;
  margin-left: auto;
  min-width: 0;
}

.nav-menu {
  display: flex !important;
  flex-direction: row !important;
  list-style: none;
  gap: var(--space-8);
  align-items: center;
  margin: 0;
  padding: 0;
  flex-wrap: nowrap;
  min-width: 0;
  position: static !important;
  background: transparent !important;
  border: none !important;
  box-shadow: none !important;
}

.nav-menu li {
  margin: 0;
  padding: 0;
}

.nav-menu a {
  font-weight: 600;
  font-size: var(--text-base);
  color: var(--color-gray-400);
  text-decoration: none;
  position: relative;
  padding: var(--space-2) 0;
  transition: color var(--transition-base);
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-base);
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--color-text-primary);
}

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

/* Theme Toggle (Desktop) */
.theme-toggle.desktop-only {
  display: block;
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--color-text-primary);
  padding: var(--space-2) var(--space-4);
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition-base);
  font-size: var(--text-base);
}

.theme-toggle.desktop-only:hover {
  background: rgba(255, 255, 255, 0.1);
}

[data-theme="light"] .theme-toggle.desktop-only {
  border-color: rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .theme-toggle.desktop-only:hover {
  background: rgba(0, 0, 0, 0.05);
}

/* ============================================
   HAMBURGER BUTTON
   ============================================ */
.mobile-menu-toggle {
  display: none !important;
  background: none;
  border: none;
  width: 40px;
  height: 40px;
  padding: 0;
  cursor: pointer;
  position: relative;
  z-index: 10001;
  color: var(--color-text-primary);
  transition: transform var(--transition-fast);
}

.mobile-menu-toggle:hover {
  transform: scale(1.1);
}

.mobile-menu-toggle:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
  border-radius: 4px;
}

.mobile-menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: currentColor;
  margin: 5px auto;
  transition: all var(--transition-base);
  transform-origin: center;
}

.mobile-menu-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.mobile-menu-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ============================================
   FULL-SCREEN OVERLAY MENU
   ============================================ */
.mobile-menu-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 10000;
  background: var(--overlay-bg);
  backdrop-filter: var(--overlay-blur);
  -webkit-backdrop-filter: var(--overlay-blur);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-menu),
              visibility var(--transition-menu);
  overflow: hidden;
}

.mobile-menu-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* Overlay Content Container */
.mobile-menu-content {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-12);
  transform: translateY(20px);
  transition: transform var(--transition-menu);
}

.mobile-menu-overlay.active .mobile-menu-content {
  transform: translateY(0);
}

/* Close Button */
.mobile-menu-close {
  position: absolute;
  top: var(--space-6);
  right: var(--space-6);
  width: 48px;
  height: 48px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.5rem;
  transition: all var(--transition-base);
  z-index: 10001;
}

[data-theme="light"] .mobile-menu-close {
  background: rgba(0, 0, 0, 0.1);
  border-color: rgba(0, 0, 0, 0.2);
  color: #000;
}

.mobile-menu-close:hover {
  background: rgba(255, 126, 95, 0.3);
  border-color: rgba(255, 126, 95, 0.5);
  transform: rotate(90deg) scale(1.1);
}

.mobile-menu-close:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
}

/* Mobile Menu List */
.mobile-menu-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--menu-item-spacing);
  text-align: center;
}

.mobile-menu-list li {
  margin: 0;
  padding: 0;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-menu),
              transform var(--transition-menu);
}

.mobile-menu-overlay.active .mobile-menu-list li {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered animation delays */
.mobile-menu-overlay.active .mobile-menu-list li:nth-child(1) {
  transition-delay: 0.06s;
}

.mobile-menu-overlay.active .mobile-menu-list li:nth-child(2) {
  transition-delay: 0.12s;
}

.mobile-menu-overlay.active .mobile-menu-list li:nth-child(3) {
  transition-delay: 0.18s;
}

.mobile-menu-overlay.active .mobile-menu-list li:nth-child(4) {
  transition-delay: 0.24s;
}

.mobile-menu-overlay.active .mobile-menu-list li:nth-child(5) {
  transition-delay: 0.30s;
}

.mobile-menu-overlay.active .mobile-menu-list li:nth-child(6) {
  transition-delay: 0.36s;
}

.mobile-menu-overlay.active .mobile-menu-list li:nth-child(7) {
  transition-delay: 0.42s;
}

/* Mobile Menu Links */
.mobile-menu-list a {
  display: block;
  font-family: var(--font-display);
  font-size: var(--menu-font-size);
  font-weight: var(--menu-font-weight);
  color: #fff;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  position: relative;
  padding: var(--space-2) 0;
  transition: all var(--transition-base);
  line-height: 1.2;
}

[data-theme="light"] .mobile-menu-list a {
  color: #000;
}

.mobile-menu-list a::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 3px;
  background: var(--color-accent);
  transition: width var(--transition-base);
}

.mobile-menu-list a:hover,
.mobile-menu-list a:focus {
  color: var(--color-accent);
  transform: scale(1.05);
}

.mobile-menu-list a:hover::before,
.mobile-menu-list a:focus::before {
  width: 80%;
}

.mobile-menu-list a.active {
  color: var(--color-accent);
}

.mobile-menu-list a.active::before {
  width: 80%;
}

/* ============================================
   RESPONSIVE BREAKPOINTS
   ============================================ */
@media (max-width: 768px) {
  :root {
    --header-height: 70px;
    --menu-item-spacing: 40px;
  }

  /* Hide desktop menu and theme toggle */
  .desktop-nav,
  .theme-toggle.desktop-only {
    display: none !important;
  }

  /* Show hamburger */
  .mobile-menu-toggle {
    display: block !important;
  }

  /* Prevent body scroll when menu is open */
  body.menu-open {
    overflow: hidden;
    position: fixed;
    width: 100%;
  }
}

@media (max-width: 480px) {
  :root {
    --menu-item-spacing: 32px;
  }

  .header-content {
    padding: 0 var(--space-4);
  }

  .logo {
    font-size: var(--text-xl);
  }

  .mobile-menu-content {
    padding: var(--space-8);
  }
}

/* ============================================
   PREFERS REDUCED MOTION
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  .header,
  .mobile-menu-overlay,
  .mobile-menu-content,
  .mobile-menu-list li,
  .mobile-menu-list a,
  .mobile-menu-close,
  .mobile-menu-toggle {
    transition: none;
    animation: none;
  }

  .mobile-menu-overlay.active .mobile-menu-list li {
    transition-delay: 0s;
  }
}

/* ============================================
   ACCESSIBILITY - Focus States
   ============================================ */
.mobile-menu-list a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 8px;
  border-radius: 4px;
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
  .header {
    position: static;
    background: #fff;
    border-bottom: 1px solid #000;
  }

  .mobile-menu-toggle,
  .mobile-menu-overlay,
  .theme-toggle {
    display: none;
  }
}