* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f4f6f8;
  color: #111827;
}

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

.sidebar {
  width: 250px;
  background: #111827;
  color: white;
  padding: 20px;
}

.brand {
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 30px;
}

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

.sidebar button {
  background: transparent;
  border: 1px solid #374151;
  color: white;
  padding: 12px;
  border-radius: 10px;
  text-align: left;
  cursor: pointer;
  font-size: 15px;
}

.sidebar button:hover {
  background: #1f2937;
}

.main {
  flex: 1;
}

.topbar {
  height: 70px;
  background: white;
  border-bottom: 1px solid #e5e7eb;
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 0 25px;
}

.topbar input {
  flex: 1;
  padding: 12px 15px;
  border: 1px solid #d1d5db;
  border-radius: 12px;
  font-size: 15px;
}

.status {
  background: #e5e7eb;
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 13px;
}

.content {
  padding: 30px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(4, minmax(160px, 1fr));
  gap: 16px;
  margin-top: 25px;
}

.card {
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 16px;
  padding: 24px;
  font-weight: 700;
  box-shadow: 0 6px 18px rgba(15, 23, 42, 0.08);
}