* {
  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: 680px;
  margin: 0 auto;
  padding: 16px;
}

h1 {
  font-size: 1.4rem;
  font-weight: 700;
  text-align: center;
  padding: 16px 0 24px;
  color: #222;
}

h2 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: #444;
}

/* フォーム */
.form-section {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 20px;
  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: #666;
  margin-bottom: 4px;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 1rem;
  background: #fafafa;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: #4a9d6f;
  background: #fff;
}

.form-row {
  display: flex;
  gap: 12px;
}

.form-row .form-group {
  flex: 1;
}

/* ボタン */
.btn {
  display: inline-block;
  padding: 11px 20px;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.2s, opacity 0.2s;
}

.btn-primary {
  background: #4a9d6f;
  color: #fff;
  width: 100%;
  margin-top: 4px;
}

.btn-primary:hover {
  background: #3a8a5e;
}

.btn-done {
  background: #e8f5ee;
  color: #4a9d6f;
  font-size: 0.85rem;
  padding: 6px 14px;
  border: 1px solid #b2dfc4;
}

.btn-done:hover {
  background: #d4eedd;
}

.btn-delete {
  background: none;
  color: #bbb;
  font-size: 0.85rem;
  padding: 6px 10px;
  border: 1px solid #ddd;
}

.btn-delete:hover {
  color: #e05555;
  border-color: #e05555;
}

/* フィルター */
.list-section {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

.filter-row {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 6px 14px;
  border: 1px solid #ddd;
  border-radius: 20px;
  background: #fafafa;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
  color: #666;
}

.filter-btn.active {
  background: #4a9d6f;
  color: #fff;
  border-color: #4a9d6f;
}

.filter-btn:hover:not(.active) {
  background: #f0f0f0;
}

/* アイテムリスト */
.item-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.item-card {
  border: 1px solid #eee;
  border-radius: 10px;
  padding: 14px 16px;
  background: #fafafa;
  transition: border-color 0.2s;
}

.item-card.status-overdue {
  border-left: 4px solid #e05555;
  background: #fff8f8;
}

.item-card.status-soon {
  border-left: 4px solid #f0a030;
  background: #fffbf0;
}

.item-card.status-ok {
  border-left: 4px solid #4a9d6f;
  background: #f8fff9;
}

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

.item-name {
  font-size: 1.05rem;
  font-weight: 600;
  color: #222;
}

.status-badge {
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 12px;
  font-weight: 600;
}

.badge-overdue {
  background: #fde8e8;
  color: #c0392b;
}

.badge-soon {
  background: #fef3e2;
  color: #d4820a;
}

.badge-ok {
  background: #e8f5ee;
  color: #2e7d52;
}

.item-dates {
  font-size: 0.85rem;
  color: #666;
  margin-bottom: 10px;
  line-height: 1.7;
}

.item-dates span {
  display: inline-block;
  margin-right: 16px;
}

.days-left {
  font-weight: 600;
}

.days-left.negative {
  color: #e05555;
}

.days-left.warning {
  color: #f0a030;
}

.item-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

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

  .form-row {
    flex-direction: column;
    gap: 0;
  }

  .item-header {
    flex-wrap: wrap;
    gap: 6px;
  }
}