.app-layout {
  display: flex;
  min-height: 100vh;
  position: relative;
}

.sidebar {
  width: 248px;
  background: var(--color-primary);
  color: #fff;
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  transition: transform 0.24s ease;
  z-index: 20;
}

.sidebar-brand {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sidebar-link {
  text-decoration: none;
  padding: 10px 12px;
  border-radius: 10px;
  opacity: 0.94;
  transition: background-color 0.2s ease, opacity 0.2s ease, transform 0.2s ease;
}

.sidebar-link:hover {
  background: rgba(255, 255, 255, 0.12);
  opacity: 1;
  transform: translateX(2px);
}

.sidebar-link.is-active {
  background: rgba(255, 255, 255, 0.2);
  font-weight: 600;
}

.content-layout {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.top-header {
  padding: 20px 28px;
  border-bottom: 1px solid var(--color-border);
  background: #fff;
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-title {
  font-size: 1.25rem;
  font-weight: 600;
}

.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  background: #fff;
  padding: 8px;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  transition: background-color 0.18s ease, border-color 0.18s ease;
}

.menu-toggle-bar {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.menu-toggle.is-open .menu-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle.is-open .menu-toggle-bar:nth-child(2) {
  opacity: 0;
}

.menu-toggle.is-open .menu-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.main-content {
  padding: 24px 28px;
  animation: fadeInUp 0.25s ease;
}

.sidebar-backdrop {
  display: none;
}

@media (max-width: 900px) {
  .app-layout {
    overflow: hidden;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: min(82vw, 290px);
    padding: 16px;
    gap: 14px;
    transform: translateX(-100%);
    box-shadow: 0 16px 34px rgba(20, 33, 36, 0.26);
  }

  .sidebar.is-open {
    transform: translateX(0);
  }

  .sidebar-nav {
    flex-direction: column;
    overflow: visible;
  }

  .sidebar-link {
    white-space: normal;
  }

  .sidebar-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    border: 0;
    background: rgba(10, 20, 22, 0.38);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
    z-index: 10;
  }

  .sidebar-backdrop.is-visible {
    opacity: 1;
    pointer-events: auto;
  }

  .top-header {
    padding: 14px 16px;
  }

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

  .main-content {
    padding: 16px;
  }
}