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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #f5f7fa;
  color: #333;
  min-height: 100vh;
}

header {
  background: #2c3e50;
  color: #fff;
  padding: 16px 20px;
  text-align: center;
}

header h1 {
  font-size: 1.3rem;
  font-weight: 700;
}

main {
  max-width: 600px;
  margin: 0 auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

section {
  background: #fff;
  border-radius: 10px;
  padding: 16px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

section h2 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: #2c3e50;
}

/* 初期残高 */
.initial-balance-section label {
  display: block;
  font-size: 0.85rem;
  color: #666;
  margin-bottom: 6px;
}

.balance-input-row {
  display: flex;
  gap: 8px;
}

.balance-input-row input {
  flex: 1;
  padding: 8px 12px;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 0.95rem;
}

.balance-input-row button {
  padding: 8px 16px;
  background: #2c3e50;
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
}

.balance-input-row button:hover {
  background: #34495e;
}

.current-balance-display {
  margin-top: 8px;
  font-size: 0.85rem;
  color: #555;
}

/* サマリー */
.summary-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 10px;
}

.summary-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 12px 8px;
  border-radius: 8px;
  text-align: center;
}

.summary-card.income {
  background: #e8f8f0;
}

.summary-card.expense {
  background: #fde8e8;
}

.summary-card.balance {
  background: #e8f0fd;
}

.summary-label {
  font-size: 0.75rem;
  color: #666;
  margin-bottom: 4px;
}

.summary-amount {
  font-size: 1.2rem;
  font-weight: 700;
}

.summary-card.income .summary-amount {
  color: #27ae60;
}

.summary-card.expense .summary-amount {
  color: #e74c3c;
}

.summary-card.balance .summary-amount {
  color: #2980b9;
}

.summary-unit {
  font-size: 0.75rem;
  color: #888;
}

/* 月選択 */
.month-section label {
  display: inline-block;
  font-size: 0.85rem;
  color: #666;
  margin-right: 8px;
}

.month-section input {
  padding: 6px 10px;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 0.9rem;
}

/* フォーム */
.form-group {
  margin-bottom: 10px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  color: #666;
  margin-bottom: 4px;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 0.95rem;
  background: #fff;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: #2980b9;
}

.add-btn {
  width: 100%;
  padding: 11px;
  background: #2980b9;
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 1rem;
  cursor: pointer;
  margin-top: 4px;
}

.add-btn:hover {
  background: #2471a3;
}

/* リスト */
.entry-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.empty-message {
  text-align: center;
  color: #aaa;
  font-size: 0.9rem;
  padding: 20px 0;
}

.entry-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  border-left: 4px solid;
}

.entry-item.income {
  background: #f0faf5;
  border-color: #27ae60;
}

.entry-item.expense {
  background: #fdf5f5;
  border-color: #e74c3c;
}

.entry-info {
  flex: 1;
}

.entry-date {
  font-size: 0.75rem;
  color: #888;
  margin-bottom: 2px;
}

.entry-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: #333;
}

.entry-type-badge {
  font-size: 0.7rem;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 600;
}

.entry-item.income .entry-type-badge {
  background: #d5f5e3;
  color: #27ae60;
}

.entry-item.expense .entry-type-badge {
  background: #fde8e8;
  color: #e74c3c;
}

.entry-amount {
  font-size: 1rem;
  font-weight: 700;
  min-width: 80px;
  text-align: right;
}

.entry-item.income .entry-amount {
  color: #27ae60;
}

.entry-item.expense .entry-amount {
  color: #e74c3c;
}

.entry-running-balance {
  font-size: 0.75rem;
  color: #666;
  min-width: 80px;
  text-align: right;
}

.entry-running-balance.negative {
  color: #e74c3c;
  font-weight: 600;
}

.delete-btn {
  background: none;
  border: none;
  color: #ccc;
  cursor: pointer;
  font-size: 1rem;
  padding: 4px;
  flex-shrink: 0;
}

.delete-btn:hover {
  color: #e74c3c;
}

@media (max-width: 400px) {
  .summary-grid {
    grid-template-columns: 1fr;
  }

  .summary-card {
    flex-direction: row;
    justify-content: space-between;
    padding: 10px 12px;
  }

  .summary-label {
    margin-bottom: 0;
  }
}