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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #f0f4f8;
  color: #333;
  min-height: 100vh;
}

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

h1 {
  font-size: 1.6rem;
  color: #1e40af;
  margin-bottom: 20px;
  text-align: center;
}

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

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

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

.form input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s;
}

.form input:focus {
  border-color: #3b82f6;
}

.form button {
  padding: 11px;
  background: #3b82f6;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.2s;
}

.form button:hover {
  background: #2563eb;
}

/* 一覧 */
.list-section {
  background: #fff;
  border-radius: 12px;
  padding: 16px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

.list-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.card-count {
  font-size: 0.85rem;
  color: #888;
}

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

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

/* カードアイテム */
.card-item {
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 12px 14px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 10px;
  transition: box-shadow 0.15s;
}

.card-item:hover {
  box-shadow: 0 2px 6px rgba(0,0,0,0.08);
}

.card-item.warning {
  border-color: #f97316;
  background: #fff7ed;
}

.card-item.expired {
  border-color: #ef4444;
  background: #fef2f2;
}

.card-info {
  flex: 1;
  min-width: 0;
}

.card-name {
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.card-points {
  font-size: 1.1rem;
  color: #1e40af;
  font-weight: 700;
  margin-bottom: 4px;
}

.card-expiry {
  font-size: 0.85rem;
  color: #666;
}

.badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 4px;
  margin-left: 6px;
}

.badge-warning {
  background: #fed7aa;
  color: #c2410c;
}

.badge-expired {
  background: #fecaca;
  color: #b91c1c;
}

.delete-btn {
  background: none;
  border: none;
  color: #bbb;
  font-size: 1.2rem;
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 4px;
  transition: color 0.15s;
  flex-shrink: 0;
}

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

@media (min-width: 480px) {
  .form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .form input:first-child {
    grid-column: 1 / -1;
  }

  .form button {
    grid-column: 1 / -1;
  }
}