:root {
  --bg: #f3f4f6;
  --card: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --border: #e5e7eb;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --income: #059669;
  --expense: #dc2626;
  --shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: linear-gradient(180deg, #eff6ff 0%, var(--bg) 100%);
  color: var(--text);
}

.app {
  width: min(960px, calc(100% - 32px));
  margin: 40px auto;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 24px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
}

.hero h1,
.card h2 {
  margin-top: 0;
}

.tag {
  display: inline-block;
  margin: 0 0 12px;
  padding: 6px 10px;
  border-radius: 999px;
  background: #dbeafe;
  color: var(--primary);
  font-size: 14px;
  font-weight: 600;
}

.subtitle,
.empty-state,
label {
  color: var(--muted);
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.summary-box {
  display: grid;
  gap: 16px;
}

.summary-box div {
  padding: 16px;
  background: #f9fafb;
  border: 1px solid var(--border);
  border-radius: 16px;
}

.summary-box span {
  display: block;
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 8px;
}

.summary-box strong {
  font-size: 28px;
}

.income {
  color: var(--income);
}

.expense {
  color: var(--expense);
}

.form {
  display: grid;
  gap: 14px;
}

label {
  display: grid;
  gap: 8px;
  font-size: 14px;
}

input,
select,
button {
  font: inherit;
}

input,
select {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  outline: none;
  background: white;
}

input:focus,
select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
}

button {
  border: none;
  border-radius: 12px;
  padding: 12px 16px;
  background: var(--primary);
  color: white;
  cursor: pointer;
  font-weight: 600;
}

button:hover {
  background: var(--primary-hover);
}

button.ghost {
  background: #eef2ff;
  color: var(--primary);
}

button.ghost:hover {
  background: #dbeafe;
}

.list-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.transaction-list {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  display: grid;
  gap: 12px;
}

.transaction-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--border);
  border-left: 6px solid var(--primary);
  border-radius: 16px;
  background: #fcfcfd;
}

.transaction-item.expense-item {
  border-left-color: var(--expense);
}

.transaction-item.income-item {
  border-left-color: var(--income);
}

.transaction-main strong,
.transaction-meta strong {
  display: block;
}

.transaction-main span,
.transaction-meta span {
  color: var(--muted);
  font-size: 14px;
}

.transaction-meta {
  text-align: right;
}

.delete-btn {
  background: #fee2e2;
  color: var(--expense);
  padding: 8px 12px;
}

.delete-btn:hover {
  background: #fecaca;
}

.empty-state {
  margin: 16px 0 0;
}

@media (max-width: 720px) {
  .app {
    width: min(100% - 20px, 960px);
    margin: 20px auto;
  }

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

  .list-header,
  .transaction-item {
    flex-direction: column;
    align-items: flex-start;
  }

  .transaction-meta {
    text-align: left;
  }
}