.header {
  background-color: var(--dark-background);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header__logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--primary-color);
  text-decoration: none;
}

.header__logo img {
  width: 100px;
}

.header__nav {
  display: flex;
}

.header__nav-list {
  display: flex;
  list-style: none;
}

.header__nav-item {
  margin-left: 20px;
}

.header__nav-link {
  text-decoration: none;
  color: var(--surface);
  font-weight: 500;
  transition: color 0.3s;
}

.header__nav-link:hover {
  color: var(--primary-color);
}

.header__actions a {
  border: 1px solid var(--surface);
  font-size: 1.2rem;
}

.header__actions a:hover {
  border: 1px solid var(--primary-dark);
  box-shadow: 0 0 10px rgba(255, 145, 48, 0.4);
}

.burger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 25px;
  height: 20px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 200;
}

.burger span {
  display: block;
  height: 3px;
  width: 100%;
  background: var(--surface);
  border-radius: 2px;
  transition: 0.3s;
}

.sidebar {
  position: fixed;
  top: 0;
  right: -260px;
  width: 260px;
  height: 100%;
  background: var(--dark-background);
  box-shadow: -2px 0 10px rgba(0, 0, 0, 0.4);
  padding: 60px 20px;
  transition: right 0.3s ease;
  z-index: 150;
}

.sidebar.active {
  right: 0;
}

.sidebar__nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar__nav li {
  margin-bottom: 20px;
}

.sidebar__nav a {
  color: var(--surface);
  text-decoration: none;
  font-size: 1.2rem;
  font-weight: 500;
  transition: color 0.3s;
}

.sidebar__nav a:hover {
  color: var(--primary-color);
}

.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  opacity: 0;
  visibility: hidden;
  transition: 0.3s;
  z-index: 100;
}

.overlay.active {
  opacity: 1;
  visibility: visible;
}

@media (max-width: 900px) {
  .header__nav {
    display: none;
  }

  .burger {
    display: flex;
  }
}

@media (max-width: 450px) {
  .header__logo img {
    width: 80px;
  }

  .header__actions a {
    padding: 10px 15px;
    font-size: 1rem;
  }
}