* {
  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;
}

.container {
  max-width: 600px;
  margin: 0 auto;
  padding: 16px;
}

h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: #2e7d32;
  text-align: center;
  padding: 20px 0 16px;
}

h2 {
  font-size: 1rem;
  font-weight: 600;
  color: #555;
  margin-bottom: 12px;
}

/* 合計費用 */
.summary {
  background: #2e7d32;
  color: #fff;
  border-radius: 12px;
  padding: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.summary-label {
  font-size: 0.95rem;
}

.summary-amount {
  font-size: 1.8rem;
  font-weight: 700;
}

/* フォームカード */
.form-card {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.form-group {
  margin-bottom: 14px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  color: #666;
  margin-bottom: 6px;
  font-weight: 500;
}

.form-group input[type="text"],
.form-group input[type="number"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s;
}

.form-group input[type="text"]:focus,
.form-group input[type="number"]:focus {
  border-color: #4CAF50;
}

/* 曜日グリッド */
.days-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.day-label {
  display: flex;
  align-items: center;
  gap: 4px;
  background: #f5f5f5;
  border: 1px solid #ddd;
  border-radius: 20px;
  padding: 6px 12px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
  user-select: none;
}

.day-label:has(input:checked) {
  background: #e8f5e9;
  border-color: #4CAF50;
  color: #2e7d32;
  font-weight: 600;
}

.day-label input {
  display: none;
}

/* ボタン */
.btn-primary {
  width: 100%;
  padding: 12px;
  background: #4CAF50;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-primary:hover {
  background: #43a047;
}

.btn-primary:active {
  background: #388e3c;
}

/* 一覧 */
.list-section {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

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

.lesson-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* 習い事カード */
.lesson-item {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  background: #f9fafb;
  border: 1px solid #e8e8e8;
  border-radius: 10px;
  padding: 14px;
  gap: 8px;
}

.lesson-info {
  flex: 1;
}

.lesson-name {
  font-size: 1rem;
  font-weight: 600;
  color: #333;
  margin-bottom: 4px;
}

.lesson-fee {
  font-size: 1rem;
  font-weight: 700;
  color: #2e7d32;
  margin-bottom: 4px;
}

.lesson-days {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.day-badge {
  background: #e8f5e9;
  color: #2e7d32;
  border-radius: 12px;
  padding: 2px 8px;
  font-size: 0.78rem;
  font-weight: 600;
}

.delete-btn {
  background: none;
  border: none;
  color: #ccc;
  font-size: 1.2rem;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 6px;
  transition: color 0.15s, background 0.15s;
  flex-shrink: 0;
}

.delete-btn:hover {
  color: #e53935;
  background: #ffeaea;
}

/* スマホ対応 */
@media (max-width: 480px) {
  h1 {
    font-size: 1.3rem;
  }

  .summary-amount {
    font-size: 1.5rem;
  }
}