:root {
  --header-height: 60px;
  --sidebar-width: 280px;
  --sidebar-bg: #000;
  --overlay-opacity: 0.45;
}

body {
  padding-top: var(--header-height);
}

body.sidebar-open {
  overflow: hidden;
}

.header {
  position: fixed;
  top: 0;
  width: 100%;
  background-color: black;
  color: white;
  padding: 10px 20px;
  z-index: 110;
}

.title-icon {
  max-height: 40px;
}

.hamburger-menu {
  display: none;
  background: transparent;
  border: 0;
  color: white;
  font-size: 28px;
  line-height: 1;
  margin-left: 10px;
  cursor: pointer;
}

.sidebar {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: var(--sidebar-width);
  height: calc(100vh - var(--header-height));
  background-color: var(--sidebar-bg);
  color: #fff;
  padding: 20px 12px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
  z-index: 105;
}

.sidebar .nav-link {
  color: #fff;
  padding: 8px 10px;
  border-radius: 6px;
  display: block;
}

.sidebar .nav-link:hover,
.sidebar .nav-link:focus {
  background-color: rgba(255, 255, 255, 0.06);
  text-decoration: none;
}

.nav-section {
  list-style: none;
}

.nav-section-title {
  font-size: 0.82rem;
  margin: 12px 0 6px;
  color: rgba(255, 255, 255, 0.75);
}

.sidebar-overlay {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 100%;
  height: calc(100vh - var(--header-height));
  background-color: rgba(0, 0, 0, var(--overlay-opacity));
  z-index: 104;
  display: none;
  opacity: 0;
  transition: opacity 0.28s ease;
}

.sidebar-overlay.active {
  display: block;
  opacity: 1;
}

.main-content {
  margin-left: var(--sidebar-width);
  padding: 20px;
}

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

@media (max-width: 768px) {
  .sidebar {
    width: min(84vw, 340px);
    transform: translateX(-100%);
    transition: transform 0.28s ease;
  }

  .sidebar.active {
    transform: translateX(0);
  }

  .main-content {
    margin-left: 0;
    padding: 16px;
  }

  .hamburger-menu {
    display: inline-block;
  }

  .title-icon {
    width: 30vw;
  }
}