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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #f0f4f8;
  color: #1e293b;
  min-height: 100vh;
}

.container {
  max-width: 640px;
  margin: 0 auto;
  padding: 16px;
}

/* ヘッダー */
header {
  text-align: center;
  padding: 24px 16px 16px;
  background: #fff;
  border-radius: 12px;
  margin-bottom: 16px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

header h1 {
  font-size: 1.5rem;
  color: #1e40af;
}

.subtitle {
  font-size: 0.85rem;
  color: #64748b;
  margin-top: 4px;
}

/* フォーム */
.form-section {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

.form-section h2 {
  font-size: 1rem;
  color: #334155;
  margin-bottom: 14px;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 14px;
}

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

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

.form-group label {
  font-size: 0.8rem;
  color: #64748b;
  font-weight: 500;
}

.form-group input {
  padding: 8px 10px;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  font-size: 0.95rem;
  color: #1e293b;
  background: #f8fafc;
  transition: border-color 0.15s;
}

.form-group input:focus {
  outline: none;
  border-color: #3b82f6;
  background: #fff;
}

.btn-add {
  width: 100%;
  padding: 10px;
  background: #3b82f6;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

.btn-add:hover {
  background: #2563eb;
}

/* サマリー */
.summary-section {
  margin-bottom: 16px;
}

.summary-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.summary-card {
  background: #fff;
  border-radius: 12px;
  padding: 16px;
  text-align: center;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
  border-top: 3px solid #f97316;
}

.summary-card.paid {
  border-top-color: #22c55e;
}

.summary-label {
  display: block;
  font-size: 0.78rem;
  color: #64748b;
  margin-bottom: 6px;
}

.summary-value {
  display: block;
  font-size: 1.25rem;
  font-weight: 700;
  color: #1e293b;
}

/* リスト */
.list-section {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

.list-section h2 {
  font-size: 1rem;
  color: #334155;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.paid-section h2 {
  color: #64748b;
}

.count {
  background: #e0e7ff;
  color: #3730a3;
  font-size: 0.8rem;
  padding: 2px 7px;
  border-radius: 99px;
  font-weight: 700;
}

.item-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.empty-msg {
  font-size: 0.9rem;
  color: #94a3b8;
  text-align: center;
  padding: 16px 0;
}

/* アイテムカード */
.item-card {
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  padding: 14px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: #f8fafc;
  transition: border-color 0.15s;
}

.item-card.overdue {
  border-left: 4px solid #ef4444;
  background: #fff5f5;
}

.item-card.due-soon {
  border-left: 4px solid #f97316;
  background: #fff7ed;
}

.item-card.done {
  opacity: 0.6;
  background: #f0fdf4;
  border-left: 4px solid #22c55e;
}

.item-check {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  cursor: pointer;
  accent-color: #22c55e;
  margin-top: 2px;
}

.item-body {
  flex: 1;
  min-width: 0;
}

.item-name {
  font-size: 0.95rem;
  font-weight: 600;
  color: #1e293b;
  word-break: break-all;
}

.item-card.done .item-name {
  text-decoration: line-through;
  color: #64748b;
}

.item-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}

.item-amount {
  font-size: 0.9rem;
  font-weight: 700;
  color: #3b82f6;
}

.item-due {
  font-size: 0.82rem;
  color: #64748b;
}

.item-due.overdue {
  color: #ef4444;
  font-weight: 600;
}

.item-due.due-soon {
  color: #f97316;
  font-weight: 600;
}

.item-memo {
  font-size: 0.82rem;
  color: #94a3b8;
  margin-top: 4px;
  word-break: break-all;
}

.badge {
  display: inline-block;
  font-size: 0.72rem;
  padding: 1px 6px;
  border-radius: 99px;
  font-weight: 600;
}

.badge-overdue {
  background: #fee2e2;
  color: #dc2626;
}

.badge-soon {
  background: #ffedd5;
  color: #ea580c;
}

.btn-delete {
  flex-shrink: 0;
  background: none;
  border: none;
  color: #cbd5e1;
  font-size: 1.1rem;
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 4px;
  transition: color 0.15s;
}

.btn-delete:hover {
  color: #ef4444;
}