body {
  margin: 0;
  background: linear-gradient(135deg, #020617, #0f172a, #1e293b);
  color: white;
  font-family: Arial, sans-serif;
}

.app {
  max-width: 1100px;
  margin: auto;
  padding: 30px 20px;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.subtitle {
  color: #cbd5e1;
}

.badge {
  background: #22c55e;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: bold;
}

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

.summary-card,
.card {
  background: rgba(30, 41, 59, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(12px);
  border-radius: 18px;
  padding: 22px;
}

.summary-card p {
  color: #94a3b8;
  margin: 0;
}

.summary-card h2 {
  margin-bottom: 0;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 25px;
}

.wide {
  grid-column: span 2;
}

input,
select,
button {
  width: 100%;
  box-sizing: border-box;
  margin-top: 12px;
  padding: 13px;
  border-radius: 12px;
  border: none;
  font-size: 15px;
}

input,
select {
  background: #f8fafc;
  color: #0f172a;
}

button {
  background: #22c55e;
  color: white;
  cursor: pointer;
  font-weight: bold;
}

button:hover {
  background: #16a34a;
}

.expense-item {
  background: #334155;
  padding: 14px;
  margin-top: 10px;
  border-radius: 12px;
}

.expense-item button {
  background: #ef4444;
}

.expense-item button:hover {
  background: #dc2626;
}

.empty {
  color: #94a3b8;
}

canvas {
  max-height: 300px;
}

@media (max-width: 700px) {
  header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  .wide {
    grid-column: span 1;
  }
}