:root {
  --primary: #3b82f6;
  --secondary: #8b5cf6;
  --background: #f9fafb;
  --text: #1e293b;
  --muted: #64748b;
  --radius: 12px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--background);
  color: var(--text);
  display: flex;
  min-height: 100vh;
}

a {
  text-decoration: none;
  color: inherit;
}

.sidebar {
  width: 230px;
  background: #fff;
  border-right: 1px solid #e2e8f0;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  padding: 2rem 1rem;
  overflow-y: auto;
}

.sidebar .logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 2rem;
}

.sidebar .logo img {
  width: 30px;
  height: 30px;
}

.sidebar h2 {
  font-size: 1.2rem;
  color: var(--primary);
  font-weight: 700;
}

.sidebar nav a {
  display: block;
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  color: var(--text);
  margin-bottom: 4px;
  transition: 0.2s;
}

.sidebar nav a:hover,
.sidebar nav a.active {
  background: var(--primary);
  color: white;
}

main {
  flex: 1;
  margin-left: 230px;
  padding: 2rem;
  overflow-x: hidden;
}

h1 {
  margin-bottom: 1.5rem;
  color: var(--primary);
}

.card {
  background: white;
  border-radius: var(--radius);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

button {
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border: none;
  border-radius: 8px;
  color: white;
  padding: 10px 14px;
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.2s;
}

button:hover {
  opacity: 0.9;
}

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    width: 100%;
    height: auto;
    bottom: 0;
    border-right: none;
    border-top: 1px solid #e2e8f0;
    display: flex;
    justify-content: space-around;
    padding: 0.5rem 0;
  }
  main {
    margin-left: 0;
    margin-bottom: 70px;
  }
}