:root {
    --nav:        #3F91E2;
    --nav-h:      4rem;
}

nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  height: var(--nav-h);
  background: var(--nav);
  box-shadow: 0 0.125rem 1.25rem rgba(63,145,226,0.35);
  display: flex;
  align-items: center;
  padding: 0 2%;
}

.logo {
  font-family: 'Fredoka', sans-serif;
  font-size: clamp(1rem, 1.5vw, 1.65rem);
  font-weight: 700;
  color: #fff;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.logo img {
  height: clamp(1.75rem, 3.5vw, 3.25rem);
  width: auto;
  object-fit: contain;
}

.logo span {
  opacity: 0.7;
  font-weight: 400;
}

.nav-links {
  display: flex;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.nav-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: rgba(255,255,255,0.75);
  font-family: 'Fredoka', sans-serif;
  font-size: clamp(0.8rem, 1vw, 1rem);
  font-weight: 500;
  padding: 0 clamp(0.5rem, 1.1vw, 1.1rem);
  height: var(--nav-h);
  position: relative;
  white-space: nowrap;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}

.nav-btn::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: clamp(0.5rem, 1.1vw, 1.1rem);
  right: clamp(0.5rem, 1.1vw, 1.1rem);
  height: 3px;
  background: #fff;
  border-radius: 3px 3px 0 0;
  transform: scaleX(0);
}

.nav-btn:hover {
  color: #fff;
  background: rgba(255,255,255,0.1);
}

.nav-btn.active {
  color: #fff;
}

.nav-btn.active::after {
  transform: scaleX(1);
}

.nav-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-search {
  background: rgba(255,255,255,0.18);
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 0.375rem;
  color: #fff;
  font-family: 'Fredoka', sans-serif;
  font-size: clamp(0.75rem, 1vw, 0.9rem);
  padding: 0.35rem 0.85rem;
  outline: none;
  width: clamp(7rem, 12vw, 13rem);
}

.nav-search::placeholder {
  color: rgba(255,255,255,0.55);
}

.nav-search:focus {
  background: rgba(255,255,255,0.25);
  width: clamp(9rem, 15vw, 16rem);
}

.nav-login-btn {
  background: rgba(255,255,255,0.2);
  border: 1px solid rgba(255,255,255,0.4);
  color: #fff;
  border-radius: 0.375rem;
  font-family: 'Fredoka', sans-serif;
  font-size: clamp(0.7rem, 0.9vw, 0.875rem);
  padding: 0.35rem 0.9rem;
  text-decoration: none;
  white-space: nowrap;
}

.nav-login-btn:hover {
  background: rgba(255,255,255,0.32);
}

.nav-logout-btn {
  color: rgba(255,255,255,0.7);
  font-size: clamp(0.7rem, 0.85vw, 0.85rem);
  text-decoration: none;
}

.nav-logout-btn:hover {
  color: #fff;
}

.nav-user {
  color: rgba(255,255,255,0.85);
  font-size: clamp(0.75rem, 0.9vw, 0.9rem);
}


/* ==================== BURGER MENU ==================== */

.burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
  width: 2.5rem;
  height: 2.5rem;
  background: rgba(255,255,255,0.15);
  border: none;
  border-radius: 0.375rem;
  cursor: pointer;
  padding: 0;
  transition: background 0.2s ease;
}

.burger:hover {
  background: rgba(255,255,255,0.25);
}

.burger-line {
  display: block;
  width: 18px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
  transform-origin: center;
}

/* Burger animation when open */
.burger.open .burger-line:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.burger.open .burger-line:nth-child(2) {
  opacity: 0;
}

.burger.open .burger-line:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* Hide mobile auth on desktop */
.nav-mobile-auth {
  display: none;
}

/* ==================== RESPONSIVE ==================== */

@media (max-width: 768px) {
  nav {
    padding: 0 1rem;
    gap: 0.75rem;
  }

  /* Show burger */
  .burger {
    display: flex;
    z-index: 210;
    margin-left: auto;
  }

  /* Hide nav-right on mobile */
  .nav-right {
    display: none;
  }

  /* Show mobile auth inside menu */
  .nav-mobile-auth {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    padding: 1.5rem;
    margin-top: 1rem;
    border-top: 1px solid rgba(255,255,255,0.15);
  }

  .nav-mobile-auth .nav-login-btn {
    font-size: 1rem;
    padding: 0.75rem 2rem;
    width: 100%;
    text-align: center;
    box-sizing: border-box;
  }

  .nav-mobile-auth .nav-user {
    font-size: 1rem;
    color: rgba(255,255,255,0.9);
  }

  .nav-mobile-auth .nav-logout-btn {
    font-size: 0.95rem;
  }

  /* Mobile nav-links */
  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--nav);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    padding: 1rem 0;
    transform: translateX(100%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s ease;
    overflow-y: auto;
  }

  .nav-links.open {
    transform: translateX(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-btn {
    height: auto;
    padding: 1rem 1.5rem;
    font-size: 1.1rem;
    justify-content: flex-start;
    border-bottom: 1px solid rgba(255,255,255,0.1);
  }

  .nav-btn::after {
    display: none;
  }

  .nav-btn.active {
    background: rgba(255,255,255,0.15);
  }

  .nav-btn:hover {
    background: rgba(255,255,255,0.1);
  }
}

/* Tablet adjustments */
@media (max-width: 900px) and (min-width: 769px) {
  .nav-btn {
    padding: 0 0.6rem;
    font-size: 0.85rem;
  }

  .nav-login-btn {
    font-size: 0.8rem;
    padding: 0.3rem 0.7rem;
  }
}