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

:root {
  --cell-size: 32px;        /* overwritten by JS based on screen + puzzle width */
  --cell-bg: #f0f0f0;
  --cell-border: #999;
  --black-bg: #111;
  --selected-bg: #4a9eff;
  --word-bg: #b3d4f5;
  --word-text: #102040;
  --app-bg: #1a1a2e;
  --panel-bg: #16213e;
  --border-color: #2a3a5c;
  --accent: #4a9eff;
  --text-light: #dde;
  --text-muted: #6a7a9a;
  --clue-hover: #1e2e4a;
  --clue-active-bg: #1e3060;
  --font: system-ui, -apple-system, Arial, sans-serif;
}

html, body {
  height: 100%;
  overflow: hidden;       /* prevent the page from scrolling — only inner panels scroll */
}

body {
  font-family: var(--font);
  background: var(--app-bg);
  color: var(--text-light);
  display: flex;
  flex-direction: column;
}

/* Hidden input — focused when a cell is selected to open the keyboard */
#hidden-input {
  position: fixed;
  top: -200px;
  left: 0;
  opacity: 0;
  width: 1px;
  height: 1px;
  pointer-events: none;
}

.hidden { display: none !important; }

/* ---- Header ---- */
header {
  background: var(--panel-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 10px 12px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.logo {
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent);
  white-space: nowrap;
  letter-spacing: 0.02em;
}

/* ---- Icon buttons (puzzle picker, etc.) ---- */
.icon-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  border-radius: 4px;
  font-size: 1rem;
  line-height: 1;
  padding: 4px 7px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  flex-shrink: 0;
}
.icon-btn:active { background: var(--clue-hover); }

/* ---- Puzzle picker drawer ---- */
.drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 70;
}

.puzzle-drawer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  max-height: 70vh;
  background: var(--panel-bg);
  border-top: 1px solid var(--border-color);
  border-radius: 14px 14px 0 0;
  display: flex;
  flex-direction: column;
  z-index: 75;
  box-shadow: 0 -4px 24px rgba(0,0,0,0.5);
}

.puzzle-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px 10px;
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

.puzzle-drawer-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.puzzle-drawer-list {
  overflow-y: auto;
  padding: 8px 0 24px;
  -webkit-overflow-scrolling: touch;
}

.drawer-date-group {
  padding: 10px 16px 6px;
}

.drawer-date {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-muted);
  display: block;
  margin-bottom: 8px;
}

.drawer-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.drawer-puzzle-chip {
  background: var(--app-bg);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 7px 14px;
  border-radius: 20px;
  font-size: 0.82rem;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: color 0.15s, border-color 0.15s;
}
.drawer-puzzle-chip:hover  { color: var(--text-light); border-color: var(--accent); }
.drawer-puzzle-chip:active { background: var(--clue-hover); }
.drawer-puzzle-chip.active { color: var(--accent); border-color: var(--accent); }

/* ---- Alerts ---- */
#error-msg {
  padding: 10px 12px;
  background: #3c1414;
  color: #ff9999;
  font-size: 0.85rem;
  flex-shrink: 0;
}

#completion-banner {
  padding: 12px;
  background: #143c1e;
  color: #80ee80;
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  flex-shrink: 0;
}

/* ---- Main — mobile-first vertical stack ---- */
main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 0;
}

/* ---- Puzzle section ---- */
.puzzle-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 8px 4px 6px;
  flex-shrink: 0;
}

#clue-bar {
  width: 100%;
  max-width: 600px;
  min-height: 42px;
  padding: 8px 12px;
  background: var(--panel-bg);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  margin-bottom: 8px;
  font-size: 0.9rem;
  line-height: 1.45;
  color: var(--text-light);
}

/* ---- Check toolbar ---- */
#check-toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 6px;
  width: 100%;
  max-width: 600px;
}

.check-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.check-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 0.72rem;
  cursor: pointer;
  white-space: nowrap;
  -webkit-tap-highlight-color: transparent;
  transition: color 0.15s, border-color 0.15s;
}

.check-btn:hover  { color: var(--text-light); border-color: var(--accent); }
.check-btn:active { background: var(--clue-hover); }

/* ---- Grid ---- */
#crossword-grid {
  display: grid;
  grid-template-columns: repeat(var(--cols, 15), var(--cell-size));
  grid-template-rows: repeat(var(--rows, 15), var(--cell-size));
  gap: 1px;
  background: var(--cell-border);
  border: 2px solid var(--cell-border);
  border-radius: 2px;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.cell {
  width: var(--cell-size);
  height: var(--cell-size);
  background: var(--cell-bg);
  position: relative;
  cursor: pointer;
  user-select: none;
}

.cell.black  { background: var(--black-bg); cursor: default; }
.cell.in-word  { background: var(--word-bg); }
.cell.selected { background: var(--selected-bg); }

.cell-number {
  position: absolute;
  top: 1px;
  left: 2px;
  font-size: calc(var(--cell-size) * 0.28);
  color: #444;
  line-height: 1;
  pointer-events: none;
}

.cell-letter {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: calc(var(--cell-size) * 0.16);
  font-size: calc(var(--cell-size) * 0.58);
  font-weight: 700;
  color: #111;
  pointer-events: none;
}

.cell.selected .cell-number { color: rgba(255,255,255,0.75); }
.cell.selected .cell-letter { color: #fff; }
.cell.in-word .cell-letter  { color: var(--word-text); }
.cell.in-word .cell-number  { color: #2a4a70; }

#puzzle-meta {
  margin-top: 6px;
  font-size: 0.7rem;
  color: var(--text-muted);
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.share-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.68rem;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: color 0.15s, border-color 0.15s;
}
.share-btn:hover  { color: var(--accent); border-color: var(--accent); }
.share-btn:active { background: var(--clue-hover); }

/* ---- Clue panel ---- */
.clue-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 0;
  border-top: 1px solid var(--border-color);
}

/* ---- Tabs ---- */
.clue-tabs {
  display: flex;
  flex-shrink: 0;
  border-bottom: 1px solid var(--border-color);
  background: var(--panel-bg);
}

.clue-tab {
  flex: 1;
  padding: 10px 0;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: color 0.15s;
}

.clue-tab.active {
  color: var(--accent);
  border-bottom: 2px solid var(--accent);
  margin-bottom: -1px;
}

/* ---- Clue lists ---- */
.clue-list {
  flex: 1;
  overflow-y: auto;
  padding: 4px 0;
  -webkit-overflow-scrolling: touch;
}

.clue-item {
  display: flex;
  gap: 8px;
  padding: 9px 12px;
  cursor: pointer;
  font-size: 0.85rem;
  line-height: 1.4;
  -webkit-tap-highlight-color: transparent;
}

.clue-item:active { background: var(--clue-hover); }
.clue-item.active { background: var(--clue-active-bg); color: var(--accent); }

.clue-num {
  font-weight: 700;
  min-width: 24px;
  text-align: right;
  flex-shrink: 0;
  color: var(--text-muted);
}

.clue-item.active .clue-num { color: var(--accent); }

/* ---- Desktop enhancement (side-by-side) ---- */
@media (min-width: 900px) {
  main { flex-direction: row; }

  .puzzle-section { padding: 16px 12px; }

  .clue-panel {
    border-top: none;
    border-left: 1px solid var(--border-color);
    max-width: 340px;
  }
}

/* ---- Header right ---- */
.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.timer-display {
  font-size: 0.8rem;
  font-variant-numeric: tabular-nums;
  color: var(--text-muted);
  min-width: 36px;
  text-align: right;
}

.user-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 0.75rem;
  cursor: pointer;
  white-space: nowrap;
  -webkit-tap-highlight-color: transparent;
}
.user-btn.logged-in { color: var(--accent); border-color: var(--accent); }
.user-btn:active { background: var(--clue-hover); }

.user-menu-wrap {
  position: relative;
}

.user-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  background: var(--panel-bg);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  overflow: hidden;
  min-width: 130px;
  z-index: 50;
  box-shadow: 0 4px 16px rgba(0,0,0,0.4);
}

.user-menu-item {
  display: block;
  width: 100%;
  background: transparent;
  border: none;
  color: var(--text-light);
  font-size: 0.85rem;
  padding: 10px 14px;
  text-align: left;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.user-menu-item:hover  { background: var(--clue-hover); }
.user-menu-item:active { background: var(--clue-active-bg); }

/* ---- Modal ---- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.72);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 16px;
}

.modal {
  background: var(--panel-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 28px 24px;
  width: 100%;
  max-width: 360px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.modal-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-light);
}

.modal-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: -8px;
}

.user-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  min-height: 0;
}

.user-chip {
  background: var(--app-bg);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  color: var(--text-muted);
  padding: 5px 14px;
  font-size: 0.82rem;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: color 0.15s, border-color 0.15s;
}
.user-chip:hover  { color: var(--text-light); border-color: var(--accent); }
.user-chip.selected { color: var(--accent); border-color: var(--accent); }

.modal-text-input {
  background: var(--app-bg);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 10px 12px;
  font-size: 1rem;
  color: var(--text-light);
  width: 100%;
  outline: none;
}
.modal-text-input:focus { border-color: var(--accent); }

.modal-error {
  font-size: 0.8rem;
  color: #ff7777;
  margin-top: -8px;
}

.modal-btn {
  background: var(--accent);
  border: none;
  border-radius: 6px;
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 10px;
  cursor: pointer;
  width: 100%;
  -webkit-tap-highlight-color: transparent;
}
.modal-btn:active { filter: brightness(0.85); }

/* ---- Stats ---- */
.stats-grid {
  display: flex;
  gap: 10px;
}

.stat-box {
  flex: 1;
  background: var(--app-bg);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 12px 8px;
  text-align: center;
}

.stat-val {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.stats-section-title {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-top: 4px;
}

.stats-recent {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 200px;
  overflow-y: auto;
}

.stats-recent li {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  padding: 6px 0;
  border-bottom: 1px solid var(--border-color);
}

.stats-puzzle-id { color: var(--text-light); }
.stats-time { color: var(--accent); font-variant-numeric: tabular-nums; }

.stats-empty {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
  padding: 12px 0;
}

/* ---- Collab — user dots ---- */
.collab-users {
  display: flex;
  gap: 4px;
  align-items: center;
}

.collab-dot {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  font-size: 0.6rem;
  font-weight: 700;
  color: #000;
  flex-shrink: 0;
  cursor: default;
  user-select: none;
}

/* ---- Collab — chat button ---- */
.chat-btn-wrap {
  position: relative;
  flex-shrink: 0;
}

.chat-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1;
  padding: 4px 7px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.chat-btn:active { background: var(--clue-hover); }

.chat-badge {
  position: absolute;
  top: -5px;
  right: -5px;
  background: #ff6b6b;
  color: #fff;
  font-size: 0.6rem;
  font-weight: 700;
  min-width: 14px;
  height: 14px;
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 3px;
  pointer-events: none;
}

/* ---- Collab — remote cursor on grid cells ---- */
.cell.remote-cursor-cell {
  outline: 2px solid var(--remote-color);
  outline-offset: -2px;
  z-index: 1;
}

.remote-cursor {
  position: absolute;
  bottom: 1px;
  left: 1px;
  right: 1px;
  font-size: min(8px, calc(var(--cell-size) * 0.22));
  font-weight: 700;
  padding: 0 1px;
  border-radius: 2px;
  pointer-events: none;
  z-index: 2;
  line-height: 1.3;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  text-align: center;
  color: #000;
}

/* ---- Chat panel ---- */
.chat-panel {
  position: fixed;
  bottom: 0;
  right: 0;
  width: min(360px, 100vw);
  height: min(480px, 60vh);
  background: var(--panel-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px 10px 0 0;
  display: flex;
  flex-direction: column;
  z-index: 80;
  box-shadow: 0 -4px 24px rgba(0,0,0,0.5);
}

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

.chat-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.chat-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1rem;
  cursor: pointer;
  padding: 2px 6px;
  -webkit-tap-highlight-color: transparent;
}
.chat-close:hover { color: var(--text-light); }

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  -webkit-overflow-scrolling: touch;
}

.chat-msg {
  display: flex;
  flex-direction: column;
  gap: 2px;
  max-width: 85%;
}

.chat-msg-mine {
  align-self: flex-end;
  align-items: flex-end;
}

.chat-name {
  font-size: 0.7rem;
  font-weight: 700;
}

.chat-text {
  background: var(--app-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 6px 10px;
  font-size: 0.85rem;
  line-height: 1.4;
  word-break: break-word;
}

.chat-msg-mine .chat-text {
  background: #1a3060;
  border-color: var(--accent);
}

.chat-system {
  align-self: center;
  font-size: 0.72rem;
  color: var(--text-muted);
  font-style: italic;
}

.chat-compose {
  display: flex;
  gap: 8px;
  padding: 10px 12px;
  border-top: 1px solid var(--border-color);
  flex-shrink: 0;
}

.chat-input-field {
  flex: 1;
  background: var(--app-bg);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 8px 10px;
  font-size: 0.9rem;
  color: var(--text-light);
  outline: none;
}
.chat-input-field:focus { border-color: var(--accent); }

.chat-send-btn {
  background: var(--accent);
  border: none;
  border-radius: 6px;
  color: #fff;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 8px 12px;
  cursor: pointer;
  white-space: nowrap;
  -webkit-tap-highlight-color: transparent;
}
.chat-send-btn:active { filter: brightness(0.85); }