* {
  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: 720px;
  margin: 0 auto;
  padding: 16px;
}

h1 {
  font-size: 1.4rem;
  font-weight: bold;
  text-align: center;
  padding: 12px 0 20px;
  color: #222;
}

h2 {
  font-size: 1rem;
  font-weight: bold;
  margin-bottom: 10px;
  color: #444;
}

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

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

.form-row input {
  flex: 1;
  min-width: 130px;
  padding: 8px 10px;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.2s;
}

.form-row input:focus {
  border-color: #4a90d9;
}

.form-row input[type="date"] {
  min-width: 140px;
}

.form-row input[type="number"] {
  min-width: 120px;
}

#addBtn {
  padding: 8px 18px;
  background: #4a90d9;
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 0.9rem;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.2s;
}

#addBtn:hover {
  background: #357abd;
}

/* タブセクション */
.tab-section {
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
  overflow: hidden;
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-bottom: 2px solid #e8e8e8;
  background: #fafafa;
  padding: 8px 8px 0;
}

.tab-btn {
  padding: 8px 16px;
  border: none;
  background: transparent;
  font-size: 0.85rem;
  cursor: pointer;
  border-radius: 6px 6px 0 0;
  color: #666;
  transition: all 0.2s;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
}

.tab-btn.active {
  color: #4a90d9;
  border-bottom-color: #4a90d9;
  background: #fff;
  font-weight: bold;
}

.tab-btn:hover:not(.active) {
  background: #eee;
}

/* グラフ */
.graph-area {
  padding: 16px;
  overflow-x: auto;
}

#chart {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
}

/* 一覧 */
.list-area {
  padding: 0 16px 16px;
}

.empty-msg {
  text-align: center;
  color: #aaa;
  padding: 24px 0;
  font-size: 0.9rem;
}

.record-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.record-table th {
  text-align: left;
  padding: 8px 6px;
  border-bottom: 2px solid #e8e8e8;
  color: #555;
  font-weight: bold;
  white-space: nowrap;
}

.record-table td {
  padding: 8px 6px;
  border-bottom: 1px solid #f0f0f0;
  vertical-align: middle;
}

.record-table tr:last-child td {
  border-bottom: none;
}

.growth-up {
  color: #27ae60;
  font-weight: bold;
}

.growth-down {
  color: #e74c3c;
  font-weight: bold;
}

.growth-flat {
  color: #aaa;
}

.delete-btn {
  padding: 4px 10px;
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 0.8rem;
  cursor: pointer;
  color: #e74c3c;
  transition: all 0.2s;
}

.delete-btn:hover {
  background: #fde8e8;
  border-color: #e74c3c;
}

/* 空状態（タブなし） */
.no-data-msg {
  text-align: center;
  color: #aaa;
  padding: 40px 20px;
  font-size: 0.95rem;
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.2rem;
  }
  .form-row input {
    min-width: 100%;
  }
  #addBtn {
    width: 100%;
  }
  .record-table {
    font-size: 0.8rem;
  }
  .record-table th,
  .record-table td {
    padding: 6px 4px;
  }
}