:root {
  color-scheme: light;
  --bg: #f6f3ee;
  --card: #ffffff;
  --text: #2b2b2b;
  --muted: #8a8a8a;
  --accent: #3f8f5f;
  --accent-dark: #2e6d47;
  --border: #e5e1d8;
  --danger: #c0533e;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.app-header {
  padding: 20px 16px 12px;
  max-width: 640px;
  margin: 0 auto;
}

.app-header h1 {
  font-size: 1.4rem;
  margin: 0 0 8px;
}

.list-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.list-actions button {
  font-size: 0.8rem;
  padding: 6px 12px;
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 16px 60px;
}

.screen.hidden,
[hidden] {
  display: none !important;
}

.lead {
  color: var(--muted);
  line-height: 1.6;
}

form {
  display: flex;
  gap: 8px;
}

input[type="text"] {
  flex: 1;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  background: var(--card);
  color: var(--text);
}

button {
  padding: 10px 14px;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 0.95rem;
  cursor: pointer;
}

button:hover {
  background: var(--accent-dark);
}

button.ghost {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
}

button.ghost:hover {
  background: var(--border);
  color: var(--text);
}

#password-screen {
  margin-top: 40px;
}

#password-form {
  margin-top: 16px;
}

.hint {
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 20px;
}

.error-message {
  color: var(--danger);
  font-size: 0.9rem;
  margin-top: 10px;
}

.search-row {
  margin: 20px 0 16px;
}

.search-row input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 1rem;
  background: var(--card);
  color: var(--text);
}

.category {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
  margin-bottom: 16px;
}

.category-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.category-name {
  font-size: 1.05rem;
  margin: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.category-count {
  color: var(--muted);
  font-size: 0.75rem;
  flex-shrink: 0;
  margin-left: auto;
}

/* 「購入済み n件」の折りたたみ見出し */
.done-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  background: transparent;
  color: var(--muted);
  font-size: 0.85rem;
  text-align: left;
  padding: 8px 0;
  border-top: 1px solid var(--border);
}

.done-toggle:hover {
  background: transparent;
  color: var(--text);
}

.done-icon {
  font-size: 0.7rem;
}

.done-list .item-name {
  text-decoration: line-through;
  color: var(--muted);
}

.delete-category-btn {
  background: transparent;
  color: var(--muted);
  font-size: 1rem;
  padding: 4px 8px;
}

.delete-category-btn:hover {
  color: var(--danger);
  background: transparent;
}

.item-list {
  list-style: none;
  margin: 10px 0;
  padding: 0;
}

.item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}

.item:last-child {
  border-bottom: none;
}

.item label {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  cursor: pointer;
}

.item-checkbox {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

.item-name {
  font-size: 0.98rem;
}

.item input:checked ~ .item-name,
.item .item-checkbox:checked + .item-name {
  text-decoration: line-through;
  color: var(--muted);
}

.delete-item-btn {
  background: transparent;
  color: var(--muted);
  padding: 4px 8px;
}

.delete-item-btn:hover {
  color: var(--danger);
  background: transparent;
}

.add-item-form {
  margin-top: 4px;
}

.add-item-form input,
.add-item-form button {
  font-size: 0.9rem;
  padding: 8px 10px;
}

.add-category-form {
  margin-top: 8px;
}

.empty-message {
  color: var(--muted);
  font-size: 0.9rem;
  padding: 6px 0;
}

.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: #2b2b2b;
  color: #fff;
  padding: 10px 18px;
  border-radius: 20px;
  font-size: 0.85rem;
}