* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

:root {
  --bg: #1a1a2e;
  --surface: #16213e;
  --primary: #0f3460;
  --accent: #e94560;
  --text: #eee;
  --text-muted: #aaa;
  --border: #2a2a4a;
  --safe-area-inset-top: env(safe-area-inset-top);
  --safe-area-inset-bottom: env(safe-area-inset-bottom);
  --safe-area-inset-left: env(safe-area-inset-left);
  --safe-area-inset-right: env(safe-area-inset-right);
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding-top: var(--safe-area-inset-top);
}

/* --- Header --- */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  padding-top: max(0.75rem, var(--safe-area-inset-top, 0px));
  padding-left: max(1rem, var(--safe-area-inset-left));
  padding-right: max(1rem, var(--safe-area-inset-right));
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  gap: 0.5rem;
  flex-shrink: 0;
}

.header-left,
.header-right {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  min-width: 5rem;
}

.header-right {
  justify-content: flex-end;
}

.header-title {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 600;
  text-align: center;
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.btn {
  padding: 0.5rem 0.75rem;
  border: none;
  border-radius: 6px;
  background: var(--primary);
  color: var(--text);
  cursor: pointer;
  font-size: 0.9rem;
}

.btn:hover:not(:disabled) {
  filter: brightness(1.2);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-icon {
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  line-height: 1;
}

.btn-undo {
  background: var(--accent);
  margin-left: 0.5rem;
}

/* --- Overview (drawer) --- */
.overview {
  position: fixed;
  top: 0;
  left: 0;
  width: 280px;
  max-width: 85vw;
  height: 100vh;
  background: var(--surface);
  border-right: 1px solid var(--border);
  z-index: 100;
  display: flex;
  flex-direction: column;
  transform: translateX(-100%);
  transition: transform 0.2s ease;
  padding-top: var(--safe-area-inset-top);
}

.overview[aria-hidden="false"] {
  transform: translateX(0);
}

.overview-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 99;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.overview-backdrop[aria-hidden="false"] {
  opacity: 1;
  pointer-events: auto;
}

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

.overview-header h2 {
  margin: 0;
  font-size: 1.1rem;
}

.overview-add {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  padding-left: max(1rem, var(--safe-area-inset-left));
  border-bottom: 1px solid var(--border);
}

.overview-add input {
  flex: 1 1 140px;
  max-width: 180px;
  min-width: 0;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-size: 16px; /* avoid iOS zoom on focus */
}

.overview-list {
  list-style: none;
  margin: 0;
  padding: 0.5rem 0;
  overflow-y: auto;
}

.overview-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  border-bottom: 1px solid var(--border);
}

.overview-list li.current {
  background: var(--primary);
}

.overview-list .list-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.overview-list .list-actions {
  display: flex;
  gap: 0.25rem;
}

.overview-list .btn-small {
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
}

/* --- Main content --- */
.main {
  flex: 1;
  padding: 1rem;
  padding-left: max(1rem, var(--safe-area-inset-left));
  padding-right: max(1rem, var(--safe-area-inset-right));
  overflow-y: auto;
}

.undo-bar {
  display: flex;
  align-items: center;
  padding: 0.5rem 0.75rem;
  background: var(--primary);
  border-radius: 6px;
  margin-bottom: 0.75rem;
}

.undo-bar[aria-hidden="true"] {
  display: none;
}

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

.items-list li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 0.5rem;
  border-bottom: 1px solid var(--border);
  cursor: grab;
  user-select: none;
}

.items-list li:active {
  cursor: grabbing;
}

.items-list li.dragging {
  opacity: 0.5;
}

.items-list li.completed {
  opacity: 0.5;
  color: var(--text-muted);
}

.items-list li.completed .item-text {
  text-decoration: line-through;
}

.item-tick {
  flex-shrink: 0;
  width: 1.5rem;
  height: 1.5rem;
  border: 2px solid var(--text-muted);
  border-radius: 4px;
  background: transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  color: var(--accent);
}

.items-list li.completed .item-tick {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--bg);
}

.item-tick:hover {
  border-color: var(--accent);
}

.item-text {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.item-drag {
  flex-shrink: 0;
  width: 1.25rem;
  color: var(--text-muted);
  cursor: grab;
  font-size: 1rem;
}

.empty-hint {
  color: var(--text-muted);
  text-align: center;
  margin: 2rem 0;
}

.empty-hint.hidden {
  display: none;
}

/* --- Add item bar --- */
.add-item-bar {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  padding-bottom: max(0.75rem, var(--safe-area-inset-bottom));
  padding-left: max(1rem, var(--safe-area-inset-left));
  padding-right: max(1rem, var(--safe-area-inset-right));
  background: var(--surface);
  border-top: 1px solid var(--border);
}

.add-item-bar[aria-hidden="true"] {
  display: none;
}

.add-item-bar input {
  flex: 1;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-size: 16px; /* avoid iOS zoom on focus */
}

.add-item-bar input:focus {
  outline: none;
  border-color: var(--accent);
}

/* --- Completed bar --- */
.completed-bar {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  padding-bottom: max(0.75rem, var(--safe-area-inset-bottom));
  padding-left: max(1rem, var(--safe-area-inset-left));
  padding-right: max(1rem, var(--safe-area-inset-right));
  background: var(--surface);
  border-top: 1px solid var(--border);
  justify-content: center;
}

.completed-bar[aria-hidden="true"] {
  display: none;
}

.btn-delete-completed {
  background: var(--accent);
  font-weight: 600;
}

.btn-delete-completed:hover:not(:disabled) {
  filter: brightness(1.2);
}