header {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  height: 80px;
  width: 100%;
}

header img {
  width: 50px;
  height: 50px;
  border-radius: 10%;
  margin-left: 3rem;
}

/* NAV */

nav {
  background: none;
  padding: 0;
  height: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0;
}

nav ul li a {
  color: #fffbe7;
  text-decoration: none;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  background: none;
  padding: 8px 12px;
  border-radius: 4px;
  transition: color 0.2s;
}

nav ul li a:hover,
nav ul li a.active {
  background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

/* Burger menu styles */
.burger-menu {
  display: none;
  flex-direction: column;
  cursor: pointer;
  margin-right: 3rem;
}

.burger-menu span {
  width: 25px;
  height: 3px;
  background-color: #fffbe7;
  margin: 3px 0;
  transition: 0.3s;
  border-radius: 2px;
}

/* 4K responsive design */
@media (min-width: 1968px) { 
  header {
    max-width: 1920px;
    margin: 0 auto;
    padding-left: 2rem;
    padding-right: 2rem;
  }

  header img {
    width: 90px;
    height: 90px;
    margin-left: 4rem;
  }

  nav ul li a {
    font-size: 2rem;
    padding: 12px 18px;
  }

  .burger-menu {
    margin-right: 4rem;
  }
}

/* Tablet responsive design */
@media (max-width: 768px) {
  header {
    justify-content: space-between;
    padding: 0;
    position: relative;
  }

  header img {
    margin-left: 1rem;
    width: 40px;
    height: 40px;
  }

  .burger-menu {
    display: flex;
    margin-right: 1rem;
  }

  nav {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: rgba(0, 0, 0, 0.95);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
  }

  nav.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  nav ul {
    flex-direction: column;
    gap: 0;
    padding: 1rem 0;
  }

  nav ul li {
    width: 100%;
    text-align: center;
  }

  nav ul li a {
    display: block;
    padding: 15px 20px;
    font-size: 0.95rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  nav ul li:last-child a {
    border-bottom: none;
  }

  /* Burger animation when active */
  .burger-menu.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
  }

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

  .burger-menu.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
  }
}

/* Mobile responsive design */
@media (max-width: 426px) {
  header {
    justify-content: space-between;
    padding: 0;
    position: relative;
  }

  header img {
    margin-left: 1rem;
    width: 40px;
    height: 40px;
  }

  .burger-menu {
    display: flex;
    margin-right: 1rem;
  }

  nav {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: rgba(0, 0, 0, 0.95);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
  }

  nav.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  nav ul {
    flex-direction: column;
    gap: 0;
    padding: 1rem 0;
  }

  nav ul li {
    width: 100%;
    text-align: center;
  }

  nav ul li a {
    display: block;
    padding: 15px 20px;
    font-size: 0.9rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  nav ul li:last-child a {
    border-bottom: none;
  }

  /* Burger animation when active */
  .burger-menu.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
  }

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

  .burger-menu.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
  }
}

@media (max-width: 376px) {
  header {
    justify-content: space-between;
    padding: 0;
    position: relative;
  }

  header img {
    margin-left: 1rem;
    width: 40px;
    height: 40px;
  }

  .burger-menu {
    display: flex;
    margin-right: 1rem;
  }

  nav {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: rgba(0, 0, 0, 0.95);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
  }

  nav.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  nav ul {
    flex-direction: column;
    gap: 0;
    padding: 1rem 0;
  }

  nav ul li {
    width: 100%;
    text-align: center;
  }

  nav ul li a {
    display: block;
    padding: 15px 20px;
    font-size: 0.9rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  nav ul li:last-child a {
    border-bottom: none;
  }

  /* Burger animation when active */
  .burger-menu.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
  }

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

  .burger-menu.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
  }
}

@media (max-width: 321px) {
  header {
    justify-content: space-between;
    padding: 0;
    position: relative;
  }

  header img {
    margin-left: 1rem;
    width: 40px;
    height: 40px;
  }

  .burger-menu {
    display: flex;
    margin-right: 1rem;
  }

  nav {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: rgba(0, 0, 0, 0.95);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
  }

  nav.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  nav ul {
    flex-direction: column;
    gap: 0;
    padding: 1rem 0;
  }

  nav ul li {
    width: 100%;
    text-align: center;
  }

  nav ul li a {
    display: block;
    padding: 15px 20px;
    font-size: 0.9rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  nav ul li:last-child a {
    border-bottom: none;
  }

  /* Burger animation when active */
  .burger-menu.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
  }

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

  .burger-menu.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
  }
}