* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  min-height: 100%;
  font-family: sans-serif;
  background: #111;
  color: #eee;
}

#app {
  display: flex;
  min-height: 100vh;
}

#sidebar {
  width: 240px;
  background: #191919;
  border-right: 1px solid #2a2a2a;
  padding: 20px;
}

.brand {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.nav {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.nav-btn {
  display: block;
  width: 100%;
  text-align: left;
  padding: 12px 14px;
  border: 1px solid #333;
  background: #202020;
  color: #eee;
  cursor: pointer;
  border-radius: 8px;
  text-decoration: none;
}

.nav-btn:hover {
  background: #2a2a2a;
}

.nav-btn.active {
  background: #2f3f5f;
  border-color: #4a6aa8;
}

#main {
  flex: 1;
  padding: 32px;
}

.view {
  display: none;
}

.view.active {
  display: block;
}

h1 {
  margin-top: 0;
}