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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f5f5f5;
  color: #333;
  min-height: 100vh;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 16px;
}

h1 {
  font-size: 1.4rem;
  font-weight: bold;
  margin-bottom: 16px;
  color: #2c3e50;
  text-align: center;
}

/* 入力セクション */
.input-section {
  background: #fff;
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 12px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.1);
}

.input-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
  min-width: 120px;
}

.input-group.narrow {
  flex: 0 0 90px;
  min-width: 80px;
}

label {
  font-size: 0.75rem;
  color: #666;
  font-weight: 600;
}

input[type="text"],
input[type="number"] {
  border: 1px solid #ddd;
  border-radius: 4px;
  padding: 8px;
  font-size: 0.9rem;
  width: 100%;
}

input:focus {
  outline: none;
  border-color: #3498db;
}

#addBtn {
  background: #3498db;
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 10px 24px;
  font-size: 0.95rem;
  cursor: pointer;
  width: 100%;
}

#addBtn:hover {
  background: #2980b9;
}

/* サマリー */
.summary-section {
  background: #2c3e50;
  color: #fff;
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 12px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.summary-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
  min-width: 140px;
}

.summary-label {
  font-size: 0.75rem;
  opacity: 0.8;
}

.summary-value {
  font-size: 1.3rem;
  font-weight: bold;
}

/* リスト */
.list-section {
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.1);
  overflow: hidden;
  margin-bottom: 12px;
}

.list-header {
  display: flex;
  gap: 8px;
  padding: 8px 12px;
  background: #ecf0f1;
  font-size: 0.75rem;
  font-weight: bold;
  color: #555;
}

.col-name { flex: 2; }
.col-num { flex: 1; text-align: right; }
.col-price { flex: 1; text-align: right; }
.col-action { flex: 0 0 36px; }

.item-row {
  display: flex;
  gap: 8px;
  padding: 10px 12px;
  border-bottom: 1px solid #f0f0f0;
  align-items: center;
  font-size: 0.9rem;
}

.item-row:last-child {
  border-bottom: none;
}

.item-row .col-name { flex: 2; font-weight: 500; word-break: break-all; }
.item-row .col-num { flex: 1; text-align: right; }
.item-row .col-price { flex: 1; text-align: right; }
.item-row .col-action { flex: 0 0 36px; text-align: center; }

.diff-plus { color: #27ae60; font-weight: bold; }
.diff-minus { color: #e74c3c; font-weight: bold; }
.diff-zero { color: #7f8c8d; }

.loss-minus { color: #e74c3c; }
.loss-zero { color: #7f8c8d; }

.btn-delete {
  background: none;
  border: none;
  color: #bbb;
  cursor: pointer;
  font-size: 1.1rem;
  padding: 2px 4px;
  border-radius: 4px;
}

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

.empty-msg {
  text-align: center;
  color: #bbb;
  padding: 32px;
  font-size: 0.9rem;
}

/* ボタン行 */
.btn-row {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

.btn-clear {
  background: #fff;
  border: 1px solid #e74c3c;
  color: #e74c3c;
  border-radius: 6px;
  padding: 8px 16px;
  font-size: 0.85rem;
  cursor: pointer;
}

.btn-clear:hover {
  background: #fdecea;
}

.btn-reset {
  background: #fff;
  border: 1px solid #bbb;
  color: #666;
  border-radius: 6px;
  padding: 8px 16px;
  font-size: 0.85rem;
  cursor: pointer;
}

.btn-reset:hover {
  background: #f5f5f5;
}

/* スマホ対応 */
@media (max-width: 480px) {
  .input-group.narrow {
    flex: 0 0 calc(50% - 4px);
  }

  .list-header {
    display: none;
  }

  .item-row {
    flex-wrap: wrap;
  }

  .item-row .col-name {
    flex: 1 0 100%;
    margin-bottom: 4px;
  }

  .item-row .col-num,
  .item-row .col-price {
    flex: 1;
  }

  .item-row .col-action {
    flex: 0 0 36px;
  }
}