/* Modern Glassmorphic Header - Evolvion Style */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-fixed);
  padding: 0;
  transition: padding 1.8s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Add padding when scrolled to make room for rounded nav */
.header.scrolled {
  padding: 1rem 0;
  transition: padding 1.8s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Nav container - starts transparent, no blur */
.nav {
  height: 60px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 2rem;
  width: 100%;
  max-width: 100%;
  margin: 0 auto;
  background: transparent;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
  border: 1px solid transparent;
  border-radius: 0;
  box-shadow: none;
  transition: max-width 1.8s cubic-bezier(0.4, 0, 0.2, 1),
              background 1.8s cubic-bezier(0.4, 0, 0.2, 1),
              backdrop-filter 1.8s cubic-bezier(0.4, 0, 0.2, 1),
              border 1.8s cubic-bezier(0.4, 0, 0.2, 1),
              border-radius 1.8s cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow 1.8s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.white-mode .nav {
  background: transparent;
  border: 1px solid transparent;
  box-shadow: none;
}

/* Scrolled state - smaller rounded island with glassmorphism */
.header.scrolled .nav {
  border-radius: 100px;
  max-width: 800px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3),
              inset 0 1px 0 rgba(255, 255, 255, 0.1);
  background: rgba(20, 20, 30, 0.9);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.white-mode .header.scrolled .nav {
  background: rgba(255, 255, 255, 0.9);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  border: 1px solid rgba(0, 0, 0, 0.1);
}

/* Subtle gradient glow - only when scrolled */
.header.scrolled .nav::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 40%;
  height: 2px;
  background: linear-gradient(90deg,
    transparent,
    hsla(var(--hue), 70%, 50%, 0.5),
    transparent);
  border-radius: 100px;
}

/* Logo styling */
.nav__logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--title-color);
  letter-spacing: -0.5px;
  position: relative;
  order: 1;
  flex-shrink: 0;
}

.nav__logo span {
  color: var(--first-color);
}

.nav__logo:hover {
  transform: translateY(-2px);
  transition: transform 0.3s ease;
}

/* Navigation links container */
.nav__links {
  order: 2;
  flex: 1;
  display: flex;
  justify-content: center;
}

/* Navigation links */
.nav__list {
  display: flex;
  gap: 0.25rem;
  align-items: center;
}

.nav__link {
  padding: 0.6rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-color);
  border-radius: 12px;
  transition: all 1.2s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.nav__link::before {
  content: '';
  position: absolute;
  bottom: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--first-color);
  transition: width 0.3s ease, box-shadow 0.3s ease;
  border-radius: 2px;
  box-shadow: 0 0 0 var(--first-color);
}

.nav__link:hover {
  color: var(--title-color);
  transform: translateY(-2px);
}

.nav__link:hover::before {
  width: 70%;
  box-shadow: 0 0 8px var(--first-color);
}

.nav__link.active {
  color: var(--title-color);
}

.nav__link.active::before {
  width: 70%;
  box-shadow: 0 0 12px var(--first-color), 0 0 20px var(--first-color);
}

/* Theme toggle - Simple icon button */
.change-theme {
  font-size: 1.25rem;
  color: var(--title-color);
  cursor: pointer;
  padding: 0.4rem;
  border-radius: 50%;
  transition: all 1.2s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
}

.change-theme:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: scale(1.1) rotate(15deg);
}

.white-mode .change-theme:hover {
  background: rgba(0, 0, 0, 0.05);
}

/* Hide toggle elements we're not using */
.nav__togg {
  display: none;
}

.theme-label {
  display: none;
}

.toggle-checkbox {
  display: none;
}

.toggle-slot {
  display: none;
}

.toggle-button {
  display: none;
}

.sun-icon-wrapper,
.moon-icon-wrapper {
  display: none;
}

/* Theme toggle positioning - Desktop */
.nav > .change-theme {
  font-size: 1.25rem;
  color: var(--title-color);
  cursor: pointer;
  padding: 0.4rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  order: 3;
  flex-shrink: 0;
}

.nav > .change-theme:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: scale(1.1) rotate(15deg);
  transition: all 0.3s ease;
}

.white-mode .nav > .change-theme:hover {
  background: rgba(0, 0, 0, 0.05);
}

/* Hide mobile theme toggle on desktop */
.nav__links .change-theme {
  display: none;
}

/* Mobile menu button */
.nav__toggle {
  display: none;
  font-size: 1.5rem;
  color: var(--title-color);
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 8px;
  transition: all 0.3s ease;
  order: 4;
  flex-shrink: 0;
}

.nav__toggle:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: scale(1.1);
}

/* Hide toggle when menu is open */
.nav__links.nav__open ~ .nav__toggle {
  display: none !important;
}

/* Hide close button on desktop */
.nav__close {
  display: none;
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--title-color);
  padding: 0.5rem;
  border-radius: 8px;
  transition: all 0.3s ease;
  z-index: 100;
}

.nav__close:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: rotate(90deg);
}

/* Responsive */
@media screen and (max-width: 767px) {
  /* Reset nav layout for mobile */
  .nav {
    justify-content: space-between;
  }

  /* Show mobile menu button */
  .nav__toggle {
    display: flex;
    position: relative;
    z-index: 10;
  }

  /* Hide desktop theme toggle */
  .nav > .change-theme {
    display: none !important;
  }

  /* Show close button ONLY inside mobile menu */
  .nav__links .nav__close {
    display: block;
  }

  /* Hide any close button that might appear outside the menu */
  .nav > .nav__close {
    display: none !important;
  }

  .nav__links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 300px;
    height: 100vh;
    background: rgba(20, 20, 30, 0.98);
    -webkit-backdrop-filter: blur(30px);
    backdrop-filter: blur(30px);
    padding: 5rem 2rem 3rem;
    transition: right 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: -4px 0 30px rgba(0, 0, 0, 0.3);
    display: flex;
    flex-direction: column;
    order: initial;
    flex: initial;
    justify-content: flex-start;
    z-index: 999999;
  }

  .white-mode .nav__links {
    background: rgba(255, 255, 255, 0.98);
    -webkit-backdrop-filter: blur(30px);
    backdrop-filter: blur(30px);
    box-shadow: -4px 0 30px rgba(0, 0, 0, 0.1);
  }

  .nav__links.nav__open {
    right: 0 !important;
  }

  .nav__list {
    flex-direction: column;
    gap: 0;
    width: 100%;
  }

  .nav__item {
    width: 100%;
  }

  .nav__link {
    display: block;
    width: 100%;
    padding: 1rem 1.5rem;
    border-radius: 12px;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
  }

  /* Theme toggle inside mobile menu - in a container */
  .nav__links .change-theme {
    display: flex;
    width: auto;
    padding: 1rem;
    margin-top: auto;
    margin-bottom: 3rem;
    align-self: center;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    min-width: 120px;
    flex-shrink: 0;
  }

  .white-mode .nav__links .change-theme {
    background: rgba(0, 0, 0, 0.03);
    border: 1px solid rgba(0, 0, 0, 0.1);
  }
}

@media screen and (max-width: 480px) {
  .nav {
    height: 70px;
    padding: 0 1rem;
  }

  .nav__logo {
    font-size: 1.1rem;
  }

  .nav__links {
    width: 280px;
  }
}

/* Smooth scroll offset for fixed header */
:target {
  scroll-margin-top: 100px;
}