* {
  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: 700px;
  margin: 0 auto;
  padding: 16px;
}

h1 {
  font-size: 1.4rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 20px;
  color: #222;
}

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

/* フォーム */
.form-section {
  background: #fff;
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 16px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 12px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.form-group label {
  font-size: 0.8rem;
  color: #666;
  font-weight: 500;
}

.form-group select,
.form-group input {
  padding: 8px 10px;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 0.95rem;
  width: 100%;
  background: #fff;
}

.form-group select:focus,
.form-group input:focus {
  outline: none;
  border-color: #4a90d9;
}

.input-with-unit {
  display: flex;
  align-items: center;
  gap: 6px;
}

.input-with-unit input {
  flex: 1;
}

.input-with-unit span {
  font-size: 0.85rem;
  color: #888;
  white-space: nowrap;
}

.btn-primary {
  width: 100%;
  padding: 12px;
  background: #4a90d9;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-primary:hover {
  background: #357abd;
}

/* タブ */
.list-section {
  background: #fff;
  border-radius: 12px;
  padding: 16px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

.tab-bar {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 6px 14px;
  border: 2px solid #ddd;
  border-radius: 20px;
  background: #fff;
  font-size: 0.85rem;
  cursor: pointer;
  font-weight: 500;
  color: #555;
  transition: all 0.2s;
}

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

.tab-btn.electricity.active {
  background: #f59e0b;
  border-color: #f59e0b;
  color: #fff;
}

.tab-btn.gas.active {
  background: #3b82f6;
  border-color: #3b82f6;
  color: #fff;
}

.tab-btn.water.active {
  background: #06b6d4;
  border-color: #06b6d4;
  color: #fff;
}

/* 記録リスト */
.record-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.record-card {
  border: 1px solid #eee;
  border-radius: 10px;
  padding: 12px 14px;
  position: relative;
}

.record-card.electricity {
  border-left: 4px solid #f59e0b;
}

.record-card.gas {
  border-left: 4px solid #3b82f6;
}

.record-card.water {
  border-left: 4px solid #06b6d4;
}

.record-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 8px;
}

.record-title {
  display: flex;
  align-items: center;
  gap: 8px;
}

.type-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 10px;
  color: #fff;
}

.electricity .type-badge { background: #f59e0b; }
.gas .type-badge { background: #3b82f6; }
.water .type-badge { background: #06b6d4; }

.record-date {
  font-size: 0.95rem;
  font-weight: 600;
  color: #333;
}

.delete-btn {
  background: none;
  border: none;
  color: #ccc;
  font-size: 1.1rem;
  cursor: pointer;
  padding: 0 4px;
  line-height: 1;
  transition: color 0.2s;
}

.delete-btn:hover {
  color: #e55;
}

.record-body {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.record-stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.stat-label {
  font-size: 0.75rem;
  color: #888;
}

.stat-value {
  font-size: 1rem;
  font-weight: 600;
  color: #222;
}

.diff-up {
  color: #e53e3e;
  font-size: 0.82rem;
  font-weight: 500;
}

.diff-down {
  color: #38a169;
  font-size: 0.82rem;
  font-weight: 500;
}

.diff-same {
  color: #888;
  font-size: 0.82rem;
}

.empty-msg {
  text-align: center;
  color: #aaa;
  font-size: 0.9rem;
  padding: 30px 0;
}

@media (max-width: 480px) {
  .form-grid {
    grid-template-columns: 1fr;
  }
}