/* Light theme (default) */
:root {
  --bg: #f5f5f0;
  --bg-elevated: #fff;
  --text: #1a1a1a;
  --text-muted: #555;
  --border: #ddd;
  --accent: #2d6a4f;
  --accent-hover: #1b4332;
  --danger: #c1121f;
  --danger-hover: #9d0e18;
  --touch-feedback: rgba(45, 106, 79, 0.15);
  --swipe-add: rgba(45, 106, 79, 0.25);
  --swipe-remove: rgba(193, 18, 31, 0.25);
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  --radius: 10px;
}

/* Dark theme */
[data-theme="dark"] {
  --bg: #1a1a1e;
  --bg-elevated: #25252b;
  --text: #e8e8e8;
  --text-muted: #a0a0a0;
  --border: #3a3a42;
  --accent: #52b788;
  --accent-hover: #74c69d;
  --danger: #e63946;
  --danger-hover: #f08080;
  --touch-feedback: rgba(82, 183, 136, 0.2);
  --swipe-add: rgba(82, 183, 136, 0.3);
  --swipe-remove: rgba(230, 57, 70, 0.3);
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  height: 100vh;
  line-height: 1.5;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
  flex-shrink: 0;
}

.title {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 600;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-header {
  padding: 0.4rem 0.75rem;
  font-size: 0.875rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elevated);
  color: var(--text);
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.btn-header:hover {
  background: var(--touch-feedback);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: none;
  border-radius: var(--radius);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.theme-toggle:hover {
  background: var(--touch-feedback);
}

.theme-toggle .icon-moon { display: none; }
.theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }
[data-theme="dark"] .theme-toggle .icon-sun { display: none; }

.tabs {
  display: flex;
  gap: 0;
  padding: 0 0.5rem;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  flex-shrink: 0;
}

.tab {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 52px;
  min-width: 44px;
  padding: 0 1rem;
  border: none;
  border-bottom: 3px solid transparent;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.95rem;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
  white-space: nowrap;
}

.tab:hover {
  color: var(--text);
  background: var(--touch-feedback);
}

.tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  font-weight: 600;
}

.tab-icon-wrap {
  position: relative;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tab-icon {
  flex-shrink: 0;
}

.tab-count-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.25rem;
  height: 1.25rem;
  padding: 0 0.35rem;
  margin-left: 0.25rem;
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1;
  color: var(--accent);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.tab-label {
  display: none;
}

@media (min-width: 600px) {
  .tab-count-badge { display: none; }
  .tab-label { display: inline; }
}

.main {
  max-width: 640px;
  margin: 0 auto;
  padding: 1.25rem;
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.panel {
  display: none;
}

.panel.active {
  display: block;
}

.panel-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.sort-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.sort-label {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.sort-btn {
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-elevated);
  color: var(--text);
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}

.sort-btn:hover {
  background: var(--touch-feedback);
  border-color: var(--accent);
}

.sort-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn-add {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border: none;
  border-radius: var(--radius);
  background: var(--accent);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-add:hover {
  background: var(--accent-hover);
}

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

.list-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-height: 52px;
  padding: 0.6rem 0.75rem;
  margin-bottom: 0.5rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  touch-action: pan-y;
  user-select: none;
  transition: transform 0.15s ease-out, background 0.15s;
}

.list-item.swipe-add {
  background: var(--swipe-add);
}

.list-item.swipe-remove {
  background: var(--swipe-remove);
}

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

.list-item-name {
  font-weight: 500;
}

.list-item-category {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.list-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0.5rem 0.75rem;
  margin-top: 1rem;
  margin-bottom: 0.35rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  list-style: none;
}

.list-section-header:first-child {
  margin-top: 0;
}

.list-section-header-title {
  flex: 1;
  min-width: 0;
}

.btn-add-in-section {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  flex-shrink: 0;
}

.btn-add-in-section:hover {
  background: var(--accent-hover);
  color: #fff;
}

.list-item-actions {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-shrink: 0;
}

.btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.btn-icon:hover {
  background: var(--touch-feedback);
  color: var(--accent);
}

.btn-icon.btn-delete:hover {
  background: var(--swipe-remove);
  color: var(--danger);
}

/* Swipe hint for master list (add to cart) */
.list-master .list-item::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 0;
  background: var(--swipe-add);
  border-radius: 0 var(--radius) var(--radius) 0;
  transition: width 0.15s;
  pointer-events: none;
}

.list-master .list-item.swipe-add::after {
  width: 60px;
}

/* Swipe hint for shopping list (remove) */
.list-shopping .list-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0;
  background: var(--swipe-remove);
  border-radius: var(--radius) 0 0 var(--radius);
  transition: width 0.15s;
  pointer-events: none;
}

.list-shopping .list-item.swipe-remove::before {
  width: 60px;
}

.list-item {
  position: relative;
}

/* Modal */
.modal {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0;
  max-width: 90vw;
  width: 360px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.modal::backdrop {
  background: rgba(0, 0, 0, 0.4);
}

.modal form {
  padding: 1.5rem;
}

.modal h2 {
  margin: 0 0 1.25rem;
  font-size: 1.25rem;
}

.modal label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.9rem;
  font-weight: 500;
}

.modal input[type="text"],
.modal select {
  width: 100%;
  padding: 0.6rem 0.75rem;
  margin-bottom: 1rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-elevated);
  color: var(--text);
  font-size: 1rem;
}

.modal input:focus,
.modal select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--touch-feedback);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.btn {
  padding: 0.5rem 1.25rem;
  border: none;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-secondary {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--border);
}

.empty-state {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.empty-state p {
  margin: 0;
}

@media (max-width: 480px) {
  .header { padding: 0.75rem 1rem; }
  .main { padding: 1rem; }
  .panel-toolbar { flex-direction: column; align-items: stretch; }
  .sort-controls { justify-content: center; }
  .btn-add { justify-content: center; }
}