/* ===== MODULAR NAVIGATION SYSTEM ===== */
/* BEM Methodology: Block__Element--Modifier */

/* Navigation Variables */
:root {
  --nav-height: 4rem;
  --nav-bg: hsl(var(--background) / 0.95);
  --nav-border: hsl(var(--border) / 0.2);
  --nav-text: hsl(var(--foreground));
  --nav-text-muted: hsl(var(--muted-foreground));
  --nav-primary: hsl(var(--primary));
  --nav-primary-foreground: hsl(var(--primary-foreground));
  --nav-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --nav-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --nav-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --nav-blur: blur(12px);
}

/* ===== NAVIGATION BLOCK ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  width: 100%;
  height: var(--nav-height);
  background: var(--nav-bg);
  backdrop-filter: var(--nav-blur);
  border-bottom: 1px solid var(--nav-border);
  box-shadow: var(--nav-shadow);
  transition: var(--nav-transition);
  padding: 0;
  margin: 0;
}

.nav--scrolled {
  background: hsl(var(--background) / 0.98);
  box-shadow: var(--nav-shadow-lg);
}

/* ===== NAVIGATION CONTAINER ===== */
.nav__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: 1280px;
  margin: 0;
  padding: 0;
  gap: 0;
  width: 100%;
}

/* ===== NAVIGATION LOGO ===== */
.nav__logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--nav-text);
  transition: var(--nav-transition);
  position: relative;
  overflow: hidden;
  margin: 0;
  padding: 0;
  margin-left: 8rem;
  flex-shrink: 0;
}

.nav__logo:hover {
  transform: translateY(-1px);
}

.nav__logo-icon {
  position: relative;
  width: 2.5rem;
  height: 2.5rem;
  background: linear-gradient(135deg, var(--nav-primary), hsl(var(--primary) / 0.8));
  border-radius: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px hsl(var(--primary) / 0.25), 0 2px 8px hsl(var(--primary) / 0.15);
  transition: var(--nav-transition);
  overflow: hidden;
  margin: 0;
  padding: 0;
}

.nav__logo-icon::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, hsl(var(--primary) / 0.3), hsl(var(--primary) / 0.1));
  border-radius: 0.75rem;
  opacity: 0;
  transition: var(--nav-transition);
}

.nav__logo:hover .nav__logo-icon::before {
  opacity: 1;
}

.nav__logo-icon-svg {
  width: 1.75rem;
  height: 1.75rem;
  transition: var(--nav-transition);
  object-fit: contain;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.nav__logo:hover .nav__logo-icon-svg {
  transform: scale(1.08) rotate(3deg);
  filter: drop-shadow(0 4px 8px rgba(59, 130, 246, 0.2));
}

.nav__logo-text {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.nav__logo-title {
  font-size: 1.25rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.025em;
  background: linear-gradient(135deg, var(--nav-text), var(--nav-primary));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  transition: var(--nav-transition);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.nav__logo:hover .nav__logo-title {
  background: linear-gradient(135deg, var(--nav-primary), hsl(var(--primary) / 0.8));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav__logo-tagline {
  font-size: 0.6875rem;
  color: var(--nav-text-muted);
  opacity: 0.9;
  font-weight: 500;
  letter-spacing: 0.025em;
  transform: none;
  transition: var(--nav-transition);
}

.nav__logo:hover .nav__logo-tagline {
  opacity: 1;
  color: hsl(var(--primary) / 0.8);
}

/* ===== NAVIGATION MENU ===== */
.nav__menu {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.nav__item {
  position: relative;
}

.nav__link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1.25rem;
  color: var(--nav-text-muted);
  text-decoration: none;
  border-radius: 0.75rem;
  font-weight: 500;
  font-size: 0.875rem;
  transition: var(--nav-transition);
  position: relative;
  overflow: hidden;
}

.nav__link::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, hsl(var(--primary) / 0.1), hsl(var(--primary) / 0.05));
  border-radius: 0.75rem;
  opacity: 0;
  transition: var(--nav-transition);
}

.nav__link:hover::before {
  opacity: 1;
}

.nav__link:hover {
  color: var(--nav-text);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px hsl(var(--primary) / 0.1);
}

.nav__link-icon {
  width: 1.25rem;
  height: 1.25rem;
  transition: var(--nav-transition);
}

.nav__link:hover .nav__link-icon {
  transform: scale(1.1) rotate(12deg);
  color: var(--nav-primary);
}

.nav__link-text {
  font-weight: 600;
  transition: var(--nav-transition);
}

.nav__link:hover .nav__link-text {
  color: var(--nav-primary);
  font-weight: 700;
}

.nav__link-underline {
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--nav-primary), hsl(var(--primary) / 0.8), var(--nav-primary));
  border-radius: 1px;
  transform: translateX(-50%);
  transition: var(--nav-transition);
}

.nav__link:hover .nav__link-underline {
  width: 80%;
}

/* ===== NAVIGATION ACTIONS ===== */
.nav__actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
  padding-right: 6rem;
  margin-right: 0;
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
}

.nav__button {
  position: relative;
  width: 2.25rem;
  height: 2.25rem;
  background: linear-gradient(135deg, hsl(var(--muted) / 0.5), hsl(var(--muted) / 0.3));
  border: none;
  border-radius: 0.5rem;
  color: var(--nav-text-muted);
  cursor: pointer;
  transition: var(--nav-transition);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.nav__button::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, hsl(var(--primary) / 0.2), hsl(var(--primary) / 0.1));
  border-radius: 0.75rem;
  opacity: 0;
  transition: var(--nav-transition);
}

.nav__button:hover::before {
  opacity: 1;
}

.nav__button:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px hsl(var(--primary) / 0.1);
  color: var(--nav-primary);
}

/* ===== THEME TOGGLE ICONS ===== */
.nav__theme-toggle {
  position: relative;
  overflow: hidden;
}

.nav__theme-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 1rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  opacity: 0;
  transform: translate(-50%, -50%) rotate(180deg) scale(0.8);
}

.nav__theme-icon--sun {
  color: #f59e0b;
  opacity: 1;
  transform: translate(-50%, -50%) rotate(0deg) scale(1);
}

.nav__theme-icon--moon {
  color: #6366f1;
  opacity: 0;
  transform: translate(-50%, -50%) rotate(180deg) scale(0.8);
}

/* Dark mode - show moon, hide sun */
[data-theme="dark"] .nav__theme-icon--sun {
  opacity: 0;
  transform: translate(-50%, -50%) rotate(-180deg) scale(0.8);
}

[data-theme="dark"] .nav__theme-icon--moon {
  opacity: 1;
  transform: translate(-50%, -50%) rotate(0deg) scale(1);
}

/* Hover animations */
.nav__theme-toggle:hover .nav__theme-icon--sun {
  transform: translate(-50%, -50%) rotate(15deg) scale(1.1);
  color: #fbbf24;
}

.nav__theme-toggle:hover .nav__theme-icon--moon {
  transform: translate(-50%, -50%) rotate(-15deg) scale(1.1);
  color: #8b5cf6;
}

/* Active state animation */
.nav__theme-toggle:active .nav__theme-icon {
  transform: translate(-50%, -50%) scale(0.95);
}

/* Smooth transition between icons */
.nav__theme-toggle {
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav__theme-toggle:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px hsl(var(--primary) / 0.2);
}

/* Icon glow effect */
.nav__theme-icon--sun {
  filter: drop-shadow(0 0 4px rgba(245, 158, 11, 0.3));
}

.nav__theme-icon--moon {
  filter: drop-shadow(0 0 4px rgba(99, 102, 241, 0.3));
}

/* Enhanced hover glow */
.nav__theme-toggle:hover .nav__theme-icon--sun {
  filter: drop-shadow(0 0 8px rgba(245, 158, 11, 0.5));
}

.nav__theme-toggle:hover .nav__theme-icon--moon {
  filter: drop-shadow(0 0 8px rgba(99, 102, 241, 0.5));
}

/* Click animation */
.nav__theme-toggle--clicking {
  transform: scale(0.95);
  box-shadow: 0 2px 8px hsl(var(--primary) / 0.3);
}

.nav__theme-toggle--clicking .nav__theme-icon {
  transform: translate(-50%, -50%) scale(0.9);
}

/* Smooth icon transitions */
.nav__theme-icon {
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Professional bounce effect on theme change */
@keyframes themeChangeBounce {
  0% { transform: translate(-50%, -50%) scale(1); }
  50% { transform: translate(-50%, -50%) scale(1.2); }
  100% { transform: translate(-50%, -50%) scale(1); }
}

.nav__theme-toggle--clicking .nav__theme-icon--sun,
.nav__theme-toggle--clicking .nav__theme-icon--moon {
  animation: themeChangeBounce 0.3s ease-out;
}

/* ===== MOBILE NAVIGATION ===== */
.nav__mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-around;
  width: 1.5rem;
  height: 1.5rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.nav__mobile-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--nav-text);
  border-radius: 1px;
  transition: var(--nav-transition);
}

.nav__mobile-toggle--active span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.nav__mobile-toggle--active span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* ===== MOBILE MENU ===== */
.nav__mobile-menu {
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background: var(--nav-bg);
  backdrop-filter: var(--nav-blur);
  border-top: 1px solid var(--nav-border);
  box-shadow: var(--nav-shadow-lg);
  transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  transition: var(--nav-transition);
  z-index: 40;
}

.nav__mobile-menu--active {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.nav__mobile-menu-content {
  padding: 1.5rem;
}

.nav__mobile-menu-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav__mobile-item {
  opacity: 0;
  transform: translateX(-20px);
  transition: var(--nav-transition);
}

.nav__mobile-menu--active .nav__mobile-item {
  opacity: 1;
  transform: translateX(0);
}

.nav__mobile-menu--active .nav__mobile-item:nth-child(1) { transition-delay: 0.1s; }
.nav__mobile-menu--active .nav__mobile-item:nth-child(2) { transition-delay: 0.2s; }
.nav__mobile-menu--active .nav__mobile-item:nth-child(3) { transition-delay: 0.3s; }
.nav__mobile-menu--active .nav__mobile-item:nth-child(4) { transition-delay: 0.4s; }

.nav__mobile-link {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.5rem;
  color: var(--nav-text-muted);
  text-decoration: none;
  border-radius: 1rem;
  font-weight: 500;
  transition: var(--nav-transition);
  background: linear-gradient(135deg, hsl(var(--muted) / 0.3), hsl(var(--muted) / 0.2));
  position: relative;
  overflow: hidden;
}

.nav__mobile-link::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, hsl(var(--primary) / 0.2), hsl(var(--primary) / 0.1));
  border-radius: 1rem;
  opacity: 0;
  transition: var(--nav-transition);
}

.nav__mobile-link:hover::before {
  opacity: 1;
}

.nav__mobile-link:hover {
  color: var(--nav-text);
  transform: translateX(8px) scale(1.02);
  box-shadow: 0 4px 12px hsl(var(--primary) / 0.1);
}

.nav__mobile-link-icon {
  width: 1.5rem;
  height: 1.5rem;
  transition: var(--nav-transition);
}

.nav__mobile-link:hover .nav__mobile-link-icon {
  transform: scale(1.1) rotate(12deg);
  color: var(--nav-primary);
}

.nav__mobile-link-content {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.nav__mobile-link-title {
  font-size: 1.125rem;
  font-weight: 600;
  transition: var(--nav-transition);
}

.nav__mobile-link:hover .nav__mobile-link-title {
  color: var(--nav-primary);
  font-weight: 700;
}

.nav__mobile-link-subtitle {
  font-size: 0.875rem;
  color: var(--nav-text-muted);
  transition: var(--nav-transition);
}

.nav__mobile-link:hover .nav__mobile-link-subtitle {
  color: hsl(var(--primary) / 0.8);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
  .nav__container {
    padding: 0;
    gap: 0;
  }
  
  .nav__logo {
    margin-left: 0.75rem;
  }
  
  .nav__logo-text {
    display: none;
  }
  
  .nav__logo-title {
    font-size: 1rem;
  }
  
  .nav__menu {
    display: none;
  }
  
  .nav__actions .nav__button:not(.nav__mobile-toggle) {
    display: none;
  }
  
  .nav__mobile-toggle {
    display: flex;
  }
  
  .nav__actions {
    padding-right: 0.75rem;
    margin-right: 0;
    right: 0;
  }
}

@media (min-width: 769px) {
  .nav__mobile-menu {
    display: none;
  }
}

/* ===== ACCESSIBILITY ===== */
.nav__link:focus,
.nav__button:focus,
.nav__mobile-toggle:focus {
  outline: 2px solid var(--nav-primary);
  outline-offset: 2px;
}

/* ===== ANIMATIONS ===== */
@keyframes navFadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.nav {
  animation: navFadeIn 0.6s ease-out;
}

/* ===== DARK MODE SUPPORT ===== */
@media (prefers-color-scheme: dark) {
  :root {
    --nav-bg: hsl(var(--background) / 0.95);
    --nav-border: hsl(var(--border) / 0.3);
  }
}

/* ===== REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
  .nav,
  .nav__link,
  .nav__button,
  .nav__mobile-toggle,
  .nav__mobile-menu {
    transition: none;
  }
  
  .nav__mobile-menu--active .nav__mobile-item {
    transition-delay: 0s;
  }
}