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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #f0f4f8;
  color: #333;
  min-height: 100vh;
}

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

h1 {
  text-align: center;
  font-size: 1.4rem;
  color: #1565c0;
  padding: 20px 0 16px;
  border-bottom: 2px solid #1565c0;
  margin-bottom: 20px;
}

h2 {
  font-size: 1rem;
  color: #1565c0;
  margin-bottom: 12px;
}

.rate-section {
  background: #fff;
  border-radius: 10px;
  padding: 14px;
  margin-bottom: 16px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

.rate-section label {
  display: block;
  font-size: 0.85rem;
  color: #555;
  margin-bottom: 6px;
}

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

.rate-row input {
  flex: 1;
  padding: 8px 10px;
  border: 1px solid #c5cae9;
  border-radius: 6px;
  font-size: 0.95rem;
}

.rate-row button {
  padding: 8px 16px;
  background: #1565c0;
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
}

.rate-row button:hover {
  background: #0d47a1;
}

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

.form-group {
  margin-bottom: 12px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  color: #555;
  margin-bottom: 4px;
}

.form-group input {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid #c5cae9;
  border-radius: 6px;
  font-size: 0.95rem;
}

.form-group input:focus {
  outline: none;
  border-color: #1565c0;
}

.add-btn {
  width: 100%;
  padding: 11px;
  background: #1565c0;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  margin-top: 4px;
}

.add-btn:hover {
  background: #0d47a1;
}

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

.total-box {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #e3f2fd;
  border: 1px solid #90caf9;
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 14px;
  font-size: 1rem;
}

#totalCost {
  font-size: 1.3rem;
  font-weight: bold;
  color: #1565c0;
}

ul {
  list-style: none;
}

li {
  border-bottom: 1px solid #e8eaf6;
  padding: 12px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

li:last-child {
  border-bottom: none;
}

.item-info {
  flex: 1;
}

.item-name {
  font-weight: bold;
  font-size: 0.95rem;
  margin-bottom: 2px;
}

.item-detail {
  font-size: 0.8rem;
  color: #777;
}

.item-cost {
  font-size: 0.95rem;
  font-weight: bold;
  color: #1565c0;
  white-space: nowrap;
}

.delete-btn {
  background: none;
  border: 1px solid #ef9a9a;
  color: #e53935;
  border-radius: 6px;
  padding: 5px 10px;
  cursor: pointer;
  font-size: 0.8rem;
  white-space: nowrap;
}

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

.empty-msg {
  text-align: center;
  color: #aaa;
  font-size: 0.9rem;
  padding: 16px 0;
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.2rem;
  }

  .item-cost {
    font-size: 0.85rem;
  }
}