:root {
  --bg: #0b1020;
  --card: #111936;
  --primary: #6366f1;
  --cyan: #22d3ee;
  --green: #22c55e;
  --red: #ef4444;
  --text: #e5e7eb;
  --muted: #94a3b8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, system-ui, sans-serif;
  background: radial-gradient(circle at top, #121a3a, var(--bg));
  color: var(--text);
}

.app {
  max-width: 1200px;
  margin: auto;
  padding: 32px;
}

header h1 {
  font-size: 36px;
  margin: 0;
  background: linear-gradient(90deg, var(--cyan), var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

header p {
  color: var(--muted);
  margin-top: 6px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin: 30px 0;
}

.card {
  background: linear-gradient(160deg, #151e46, var(--card));
  padding: 20px;
  border-radius: 16px;
  box-shadow: 0 15px 35px rgba(0,0,0,0.4);
}

.card span {
  color: var(--muted);
  font-size: 14px;
}

.card h2 {
  margin-top: 10px;
  font-size: 28px;
}

.income h2 { color: var(--green); }
.expense h2 { color: var(--red); }
.balance h2 { color: var(--cyan); }

.panel {
  background: linear-gradient(160deg, #141d44, var(--card));
  padding: 24px;
  border-radius: 18px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.45);
  margin-bottom: 28px;
}

.panel h3 {
  margin-top: 0;
}

.form {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr auto;
  gap: 12px;
}

input, select {
  background: #0f1635;
  border: 1px solid #1f2a60;
  color: var(--text);
  padding: 12px;
  border-radius: 10px;
}

button {
  background: linear-gradient(135deg, var(--primary), var(--cyan));
  border: none;
  color: #fff;
  padding: 0 20px;
  border-radius: 10px;
  font-weight: 600;
  cursor: pointer;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th {
  text-align: left;
  color: var(--muted);
  font-size: 13px;
  padding-bottom: 10px;
}

td {
  padding: 14px 0;
  border-top: 1px solid #1f2a60;
}

.delete {
  background: none;
  border: none;
  color: var(--red);
  cursor: pointer;
}

@media (max-width: 768px) {
  .form {
    grid-template-columns: 1fr;
  }
}