/* ── VARIABLES ─────────────────────────────────────────── */
:root {
  --bg:         #f5f0e8;
  --surface:    #ffffff;
  --border:     #14110d;
  --border-lt:  #d6d0c4;
  --accent:     #D7321F;
  --text:       #14110d;
  --muted:      #7A736A;
  --correct:    #1a7a4a;
  --wrong:      #D7321F;
  --cell-size:  48px;
  --black-cell: #14110d;
  --signal-red: #D7321F;
}

/* ── RESET ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter Tight', system-ui, sans-serif;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── LAYOUT ─────────────────────────────────────────────── */
.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; position: relative; }
.game-section > .container { max-width: 1360px; }

/* ── HEADER ─────────────────────────────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--bg);
  border-bottom: 1.5px solid var(--border);
  padding: 0;
}
.nav-shell {
  display: flex; align-items: stretch; justify-content: space-between;
  height: 64px;
}
.brand-mark {
  text-decoration: none;
  display: flex; align-items: center; gap: 12px;
  padding: 0 20px 0 0;
  border-right: 1.5px solid var(--border);
}
.tc-logo {
  height: 72px; width: auto; display: block;
}
.brand-text { display: flex; flex-direction: column; justify-content: center; gap: 1px; }
.brand-name {
  font-size: .78rem; font-weight: 800;
  color: var(--text); letter-spacing: .1em; text-transform: uppercase;
}
.brand-sub {
  font-size: .62rem; color: var(--muted);
  font-weight: 500; letter-spacing: .06em; text-transform: uppercase;
}
.etl-logo { height: 28px; width: auto; display: block; }
.site-nav { display: flex; align-items: stretch; }
.site-nav a,
.nav-btn {
  display: flex; align-items: center;
  color: var(--text); text-decoration: none;
  font-size: .72rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase;
  padding: 0 20px;
  border-left: 1.5px solid var(--border);
  background: none; border-top: none; border-bottom: none; border-right: none;
  cursor: pointer; font-family: inherit;
  transition: background .12s, color .12s;
}
.site-nav a:hover,
.nav-btn:hover { background: var(--text); color: var(--bg); }

/* ── PUZZLE STATS BAR ────────────────────────────────────── */
.puzzle-stats-bar {
  border-bottom: 1.5px solid var(--border);
  padding: 10px 0;
}
.puzzle-stats-bar .container {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
}
.stats-bar-item {
  font-family: 'JetBrains Mono', monospace;
  font-size: .72rem; font-weight: 500;
  letter-spacing: .04em; text-transform: uppercase;
  color: var(--muted);
}
.stats-bar-item.center { text-align: center; }
.stats-bar-item.right  { text-align: right; }
.stats-bar-live { color: var(--accent); font-weight: 700; }
.stats-bar-live::before {
  content: '● '; font-size: .6rem;
}

/* ── MODALS ─────────────────────────────────────────────── */
.modal { position: fixed; inset: 0; z-index: 200; display: flex; align-items: center; justify-content: center; padding: 20px; }
.modal[hidden] { display: none; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(0,0,0,.6); }
.modal-box {
  position: relative; z-index: 1;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: 0;
  padding: 32px;
  max-width: 480px; width: 100%;
  max-height: 90vh; overflow-y: auto;
}
.modal-close {
  position: absolute; top: 16px; right: 18px;
  background: none; border: none; color: var(--muted);
  font-size: 1.4rem; cursor: pointer; line-height: 1; padding: 4px;
}
.modal-close:hover { color: var(--text); }
.modal-box h2 {
  font-size: 1.5rem; font-weight: 900; margin-bottom: 12px;
  color: var(--text); letter-spacing: -.02em;
  text-transform: uppercase;
}
.modal-intro { color: var(--muted); font-size: .9rem; margin-bottom: 16px; line-height: 1.5; }

.howto-list { list-style: none; display: flex; flex-direction: column; gap: 8px; margin-bottom: 20px; }
.howto-list li { font-size: .88rem; color: var(--muted); padding-left: 16px; position: relative; line-height: 1.5; }
.howto-list li::before { content: '—'; position: absolute; left: 0; color: var(--accent); }
.howto-list li strong { color: var(--text); }

.howto-example {
  background: var(--bg); border: 1.5px solid var(--border);
  padding: 16px; margin-bottom: 20px;
}
.example-label { font-size: .75rem; color: var(--muted); margin-bottom: 10px; font-family: 'JetBrains Mono', monospace; }
.example-row { display: flex; align-items: center; gap: 10px; padding: 5px 0; font-size: .88rem; }
.ex-word { font-weight: 800; font-family: 'JetBrains Mono', monospace; min-width: 52px; }
.ex-word.highlight { color: var(--accent); }
.ex-math { color: var(--muted); flex: 1; font-size: .78rem; font-family: 'JetBrains Mono', monospace; }
.ex-result { font-size: 1rem; }
.ex-result.correct { color: var(--correct); }
.ex-result.wrong   { color: var(--wrong); }

.howto-difficulties { display: flex; flex-direction: column; gap: 8px; }
.diff-row { font-size: .85rem; color: var(--muted); display: flex; align-items: center; gap: 8px; }

/* Stats modal */
.stats-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 12px; margin-bottom: 20px; }
.stat-block {
  background: var(--bg); border: 1.5px solid var(--border);
  padding: 16px; text-align: center;
}
.stat-num   { display: block; font-size: 2rem; font-weight: 900; color: var(--text); font-family: 'JetBrains Mono', monospace; }
.stat-label { display: block; font-size: .68rem; color: var(--muted); margin-top: 2px; text-transform: uppercase; letter-spacing: .08em; }
.best-times h3 { font-size: .78rem; font-weight: 700; color: var(--muted); margin-bottom: 10px; text-transform: uppercase; letter-spacing: .08em; }
.best-time-row { display: flex; align-items: center; gap: 10px; padding: 8px 0; font-size: .88rem; border-bottom: 1px solid var(--border-lt); }
.best-time-row:last-child { border-bottom: none; }

/* Complete modal */
.complete-box { text-align: center; }
.complete-time {
  font-size: 3rem; font-weight: 900; color: var(--text);
  margin: 8px 0; font-family: 'JetBrains Mono', monospace; letter-spacing: -.04em;
}
.complete-meta { font-size: .85rem; color: var(--muted); margin-bottom: 16px; }
.complete-streak { font-size: .85rem; color: var(--muted); margin-top: 12px; }
.next-puzzle {
  font-family: 'JetBrains Mono', monospace;
  font-size: .78rem; color: var(--muted);
  margin-top: 6px; letter-spacing: .04em;
}
.complete-actions { display: flex; flex-direction: column; gap: 8px; margin-top: 16px; }
.complete-actions .primary-button,
.complete-actions .secondary-button { margin-bottom: 0; }

/* Reactions */
.reaction-bar { margin-bottom: 16px; }
.reaction-label {
  font-size: .68rem; font-weight: 800; text-transform: uppercase;
  letter-spacing: .1em; color: var(--muted); margin-bottom: 8px;
}
.reaction-buttons { display: flex; gap: 6px; }
.reaction-btn {
  flex: 1; background: none; border: 1.5px solid var(--border-lt);
  color: var(--muted); padding: 9px 4px;
  font-size: .72rem; font-weight: 800; cursor: pointer;
  font-family: inherit; text-transform: uppercase; letter-spacing: .08em;
  transition: all .12s; border-radius: 0;
}
.reaction-btn:hover:not(:disabled) { border-color: var(--text); color: var(--text); }
.reaction-btn.selected { border-color: var(--text); color: var(--bg); background: var(--text); }
.reaction-btn.selected[data-reaction="easy"] { background: var(--correct); border-color: var(--correct); }
.reaction-btn.selected[data-reaction="hard"] { background: var(--accent); border-color: var(--accent); }
.reaction-btn:disabled { opacity: .45; cursor: default; }

.reaction-tally {
  display: flex; gap: 12px; flex-wrap: wrap;
  padding: 12px 0; border-top: 1px solid var(--border-lt);
  margin-bottom: 12px;
}
.reaction-tally:empty { display: none; }
.rt-item {
  display: flex; align-items: center; gap: 5px;
  font-size: .72rem; font-weight: 800;
  text-transform: uppercase; letter-spacing: .08em; color: var(--muted);
}
.rt-count { font-family: 'JetBrains Mono', monospace; color: var(--text); }

/* Username prompt */
.username-prompt { margin-bottom: 16px; }
.username-label { font-size: .8rem; color: var(--muted); margin-bottom: 8px; }
.username-row { display: flex; gap: 8px; }
.username-input {
  flex: 1; background: var(--bg); border: 1.5px solid var(--border);
  color: var(--text); padding: 10px 12px;
  font-size: .9rem; font-family: inherit; outline: none;
  border-radius: 0;
}
.username-input:focus { border-color: var(--accent); }
.username-row .primary-button { width: auto; flex-shrink: 0; margin-bottom: 0; padding: 10px 16px; }

/* Leaderboard */
.leaderboard-wrap { margin-bottom: 16px; text-align: left; }
.leaderboard-title {
  font-size: .72rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: .1em; color: var(--muted); margin-bottom: 10px;
}
.leaderboard-list { list-style: none; display: flex; flex-direction: column; gap: 2px; }
.lb-row {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 10px;
  background: var(--bg); font-size: .88rem;
  border: 1px solid var(--border-lt);
}
.lb-row.lb-me { background: #fff0f1; border-color: var(--accent); }
.lb-rank { width: 20px; text-align: right; color: var(--muted); font-size: .78rem; flex-shrink: 0; font-family: 'JetBrains Mono', monospace; }
.lb-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 600; }
.lb-time { font-weight: 700; color: var(--text); flex-shrink: 0; font-family: 'JetBrains Mono', monospace; }
.lb-loading { font-size: .85rem; color: var(--muted); padding: 8px 0; }

.primary-button {
  display: inline-block; width: 100%;
  background: var(--text); color: var(--bg);
  border: 2px solid var(--text); border-radius: 0;
  padding: 13px; font-size: .82rem; font-weight: 800;
  cursor: pointer; font-family: inherit; transition: background .12s, color .12s;
  margin-bottom: 8px; letter-spacing: .08em; text-transform: uppercase;
}
.primary-button:hover { background: var(--accent); border-color: var(--accent); color: #fff; }

.secondary-button {
  display: inline-block; width: 100%;
  background: none; color: var(--muted);
  border: 1.5px solid var(--border-lt); border-radius: 0;
  padding: 11px; font-size: .82rem; letter-spacing: .06em; text-transform: uppercase;
  cursor: pointer; font-family: inherit; transition: all .12s; font-weight: 700;
}
.secondary-button:hover { border-color: var(--text); color: var(--text); }

/* Diff badges */
.diff-badge {
  display: inline-block; font-size: .68rem; font-weight: 800;
  padding: 2px 8px; letter-spacing: .08em; text-transform: uppercase;
}
.diff-badge.easy   { background: #d4edda; color: #1a5c34; border: 1px solid #1a5c34; }
.diff-badge.medium { background: #fff3cd; color: #856404; border: 1px solid #856404; }
.diff-badge.hard   { background: #f8d7da; color: #842029; border: 1px solid #842029; }

/* ── PUZZLE META ─────────────────────────────────────────── */
.game-section { padding: 24px 0 80px; }

/* ── DIFFICULTY PICKER ───────────────────────────────────── */
.difficulty-section {
  padding: 48px 0 56px;
  border-bottom: 1.5px solid var(--border);
}
.difficulty-section[hidden] { display: none; }
.tc-page-title {
  font-size: clamp(1.5rem, 4.5vw, 2.25rem); font-weight: 800; line-height: 1.1;
  letter-spacing: -.02em; margin: 0 0 14px;
}
.picker-label {
  font-size: .7rem; font-weight: 800; letter-spacing: .12em;
  text-transform: uppercase; color: var(--muted); margin-bottom: 20px;
}
.picker-buttons { display: flex; gap: 0; flex-wrap: wrap; border: 2px solid var(--border); }
.diff-btn {
  background: var(--surface);
  border: none;
  border-right: 2px solid var(--border);
  padding: 28px 32px;
  cursor: pointer; font-family: inherit;
  text-align: left; transition: background .12s, color .12s; flex: 1;
  position: relative;
}
.diff-btn:last-child { border-right: none; }
.diff-btn:hover { background: var(--text); }
.diff-btn:hover .diff-btn-num,
.diff-btn:hover .diff-btn-name,
.diff-btn:hover .diff-btn-desc { color: var(--bg); }
.diff-btn-num {
  display: block; font-size: .7rem; font-weight: 800; color: var(--muted);
  letter-spacing: .12em; text-transform: uppercase; margin-bottom: 10px;
  font-family: 'JetBrains Mono', monospace; transition: color .12s;
}
.diff-btn-name {
  display: block; font-size: 1.3rem; font-weight: 900; color: var(--text);
  margin-bottom: 6px; text-transform: uppercase; letter-spacing: -.02em;
  transition: color .12s;
}
.diff-btn-desc { display: block; font-size: .8rem; color: var(--muted); line-height: 1.5; transition: color .12s; }

/* ── GAME BOARD ─────────────────────────────────────────── */
.game-board {
  display: flex;
  gap: 28px;
  align-items: start;
}

/* ── GRID WRAPPER ───────────────────────────────────────── */
.grid-wrapper {
  flex: 0 0 auto;
  position: relative;
  overflow: visible;
  padding-right: 52px;
  padding-bottom: 40px;
}

/* ── CROSSWORD GRID ─────────────────────────────────────── */
.grid {
  display: grid;
  gap: 0;
  border: 2px solid var(--border);
  background: var(--border);
  line-height: 1;
  user-select: none;
}

.cell {
  width: var(--cell-size);
  height: var(--cell-size);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.cell.blocked { background: var(--black-cell); }

/* Phrase-space cell — thin separator between words in a multi-word answer */
.cell.active.space-cell {
  background: #e8e3db;
  border-color: #c8c3bb;
  cursor: default;
  pointer-events: none;
}
.cell.active.space-cell::after {
  content: '';
  display: block;
  width: 2px;
  height: 55%;
  background: #c0b8ae;
  border-radius: 1px;
}

.cell.active {
  background: #ffffff;
  border: 1px solid #c8c3bb;
  cursor: text;
}
.cell.active.intersection            { background: rgba(215, 50, 31, 0.10); }
.cell.active.intersection.word-active{ background: rgba(215, 50, 31, 0.22); }
.cell.active.intersection.selected   { background: rgba(215, 50, 31, 0.40); }
.cell.active.word-active { background: #fffbe6; }
.cell.active.selected    { background: #ffd6d9; }
.cell.active.prefill     { background: #e8f5ee; }
.cell.active.correct     { background: #d4edda; }

.cell.wrong-flash { animation: wrongFlash .6s ease; }
@keyframes wrongFlash {
  0%,100% { background: #ffffff; }
  35%     { background: #ffd6d9; }
}

.cell-number {
  position: absolute;
  top: 3px; left: 4px;
  font-size: 9px; font-weight: 800;
  color: var(--muted);
  line-height: 1; pointer-events: none; z-index: 1;
  font-family: 'JetBrains Mono', monospace;
}

.cell-letter {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  background: transparent; border: none; outline: none;
  text-align: center;
  font-size: calc(var(--cell-size) * 0.46);
  font-weight: 900;
  font-family: 'Inter Tight', system-ui, sans-serif;
  color: var(--text);
  text-transform: uppercase;
  cursor: text;
  padding-top: 6px;
  caret-color: transparent;
}
.cell-letter[readonly] { color: var(--correct); }

/* ── SUM CHIPS ───────────────────────────────────────────── */
.sum-chip {
  position: absolute;
  background: #14110d;
  border: none;
  color: #f5f0e8;
  font-size: 13px; font-weight: 700;
  padding: 4px 9px;
  white-space: nowrap;
  pointer-events: none;
  z-index: 10;
  transition: background .2s, color .2s;
  letter-spacing: .04em;
  font-family: 'JetBrains Mono', monospace;
}
.sum-chip.active  { background: var(--accent); color: #ffffff; }
.sum-chip.matched { background: var(--correct); color: #ffffff; }

/* ── CLUE PANEL ─────────────────────────────────────────── */
.clue-panel {
  flex: 1 1 280px;
  min-width: 200px;
  max-width: 320px;
  display: flex; flex-direction: column; gap: 16px;
}

.hint-bar {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px;
  background: var(--surface); border: 1.5px solid var(--border);
}
.timer-display {
  margin-left: auto;
  font-family: 'JetBrains Mono', monospace;
  font-size: .95rem; font-weight: 700; color: var(--text);
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
}
.hint-btn {
  background: none; border: 1.5px solid var(--text);
  color: var(--text); padding: 6px 12px;
  font-size: .72rem; font-weight: 800;
  cursor: pointer; font-family: inherit; transition: all .12s;
  text-transform: uppercase; letter-spacing: .08em;
  display: flex; align-items: center; gap: 6px;
  flex-shrink: 0;
}
.hint-btn:hover { background: var(--text); color: var(--bg); }
.hint-cost {
  font-family: 'JetBrains Mono', monospace;
  font-size: .68rem; color: var(--accent);
  font-weight: 700;
}
.hint-btn:hover .hint-cost { color: var(--bg); }
.hint-count {
  font-family: 'JetBrains Mono', monospace;
  font-size: .72rem; color: var(--muted); font-weight: 500;
  letter-spacing: .04em;
}

/* Timer penalty flash */
@keyframes timerFlash {
  0%,100% { color: var(--text); }
  40%     { color: var(--accent); transform: scale(1.1); }
}
.timer-display.timer-penalty { animation: timerFlash .6s ease; }

/* Leaderboard hints column */
.lb-hints {
  font-size: .72rem; color: var(--muted);
  font-family: 'JetBrains Mono', monospace;
  flex-shrink: 0;
}

/* Stats modal best-time label */
.best-time-label {
  flex: 1; font-size: .85rem; color: var(--muted);
}

.lifelines {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  padding: 12px 14px;
  background: var(--surface); border: 1.5px solid var(--border);
}
.lifeline-label { font-size: .72rem; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; font-weight: 700; }
.lifeline-dots  { display: flex; gap: 5px; }
.lifeline-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--text); transition: background .2s;
}
.lifeline-dot.used { background: var(--border-lt); }
.reveal-btn {
  margin-left: auto; background: none;
  border: 1.5px solid var(--text); color: var(--text);
  padding: 5px 10px; font-size: .72rem; font-weight: 800;
  cursor: pointer; font-family: inherit; transition: all .12s;
  text-transform: uppercase; letter-spacing: .06em;
}
.reveal-btn:hover:not(:disabled) { background: var(--text); color: var(--bg); }
.reveal-btn:disabled { opacity: .35; cursor: default; }

.hard-submit { padding-top: 4px; }

/* Letter reference */
.letter-ref {
  background: var(--surface);
  border: 1.5px solid var(--border-lt);
  padding: 10px 12px;
}
.letter-ref-label {
  font-size: .65rem; font-weight: 800; text-transform: uppercase;
  letter-spacing: .1em; color: var(--muted); margin-bottom: 8px;
}
.letter-ref-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 3px; }
.letter-ref-vowels { display: flex; gap: 6px; }
.lref-item { display: flex; flex-direction: column; align-items: center; gap: 1px; }
.lref-l { font-size: .72rem; font-weight: 800; color: var(--text); line-height: 1; }
.lref-v { font-size: .65rem; color: var(--accent); font-variant-numeric: tabular-nums; line-height: 1; font-family: 'JetBrains Mono', monospace; }

.clue-columns { display: flex; flex-direction: column; gap: 16px; }

.clue-theme-label {
  font-size: .65rem; font-weight: 800; text-transform: uppercase;
  letter-spacing: .12em; color: var(--muted);
}
.clue-theme-value {
  font-size: .95rem; font-weight: 800; color: var(--text);
  margin-bottom: 8px; padding-bottom: 8px;
  border-bottom: 1.5px solid var(--border);
}

.clue-list {
  list-style: none;
  display: flex; flex-direction: column; gap: 1px;
  max-height: 260px; overflow-y: auto;
}
.clue-list::-webkit-scrollbar { width: 3px; }
.clue-list::-webkit-scrollbar-thumb { background: var(--border-lt); }

.clue-item {
  display: flex; align-items: center; gap: 6px;
  padding: 6px 8px;
  cursor: pointer; transition: background .1s;
}
.clue-item:hover  { background: #ede8e0; }
.clue-item.active { background: #ffd6d9; }
.clue-item.solved { opacity: .4; pointer-events: none; }

.clue-num {
  font-weight: 800; color: var(--muted);
  min-width: 28px; font-size: .72rem;
  font-variant-numeric: tabular-nums;
  font-family: 'JetBrains Mono', monospace;
}
.clue-item.active .clue-num { color: var(--accent); }

.clue-sum { display: flex; align-items: center; gap: 3px; flex: 1; font-size: .82rem; }
.clue-current {
  font-weight: 800; color: var(--text);
  font-variant-numeric: tabular-nums; min-width: 22px;
  font-family: 'JetBrains Mono', monospace;
}
.clue-current.matched { color: var(--correct); }
.clue-sep    { color: var(--border-lt); font-size: .7rem; }
.clue-target { color: var(--muted); font-variant-numeric: tabular-nums; font-family: 'JetBrains Mono', monospace; }

.clue-check { color: var(--correct); font-size: .8rem; opacity: 0; transition: opacity .2s; }
.clue-item.solved .clue-check { opacity: 1; }

/* ── TUTORIAL ────────────────────────────────────────────── */
#tutorial-overlay {
  position: fixed; inset: 0; z-index: 300;
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
}
#tutorial-overlay[hidden] { display: none; }
.tutorial-backdrop {
  position: absolute; inset: 0;
  background: rgba(0,0,0,.8);
}
.tutorial-shell {
  position: relative; z-index: 1;
  display: flex; gap: 32px; align-items: flex-start;
  max-width: 820px; width: 100%;
}
.tutorial-puzzle-area { display: flex; flex-direction: column; gap: 12px; flex-shrink: 0; }
.tutorial-themes { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.tutorial-theme-val { font-size: .85rem; font-weight: 800; color: var(--bg); }
.tutorial-grid-wrap { position: relative; overflow: visible; padding-right: 52px; padding-bottom: 36px; }
.tutorial-card {
  background: var(--surface);
  border: 2px solid var(--border);
  padding: 28px;
  min-width: 260px; max-width: 320px;
  display: flex; flex-direction: column; gap: 14px;
}
.tutorial-step-dots { display: flex; gap: 5px; }
.tut-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--border-lt); transition: background .2s; }
.tut-dot.active { background: var(--text); }
.tutorial-title { font-size: 1.05rem; font-weight: 900; color: var(--text); text-transform: uppercase; letter-spacing: -.01em; }
.tutorial-body { font-size: .88rem; color: var(--muted); line-height: 1.65; }
.tutorial-body strong { color: var(--text); }
.tutorial-actions { display: flex; gap: 8px; align-items: center; margin-top: 4px; }
.tutorial-next-btn { flex: 1; margin-bottom: 0; }
.tutorial-skip-btn {
  background: none; border: none;
  color: var(--muted); font-size: .78rem; font-weight: 700;
  cursor: pointer; font-family: inherit; padding: 4px 8px;
  transition: color .12s; text-transform: uppercase; letter-spacing: .06em;
}
.tutorial-skip-btn:hover { color: var(--text); }
.cell.active.tut-intersection {
  background: #fffbe6;
  box-shadow: inset 0 0 0 2px var(--accent);
}

@media (max-width: 700px) {
  .tutorial-shell { flex-direction: column; align-items: center; }
  .tutorial-card  { max-width: 100%; min-width: unset; width: 100%; }
}

/* ── ABOUT SECTION ───────────────────────────────────────── */
.about-section { border-top: 2px solid var(--border); padding: 80px 0; }
.section-header { max-width: 680px; margin: 0 auto 56px; }
.eyebrow {
  font-size: .7rem; font-weight: 800; text-transform: uppercase;
  letter-spacing: .14em; color: var(--muted); margin-bottom: 16px;
  font-family: 'JetBrains Mono', monospace;
}
.section-title {
  font-size: clamp(2.4rem, 5vw, 4rem); font-weight: 900;
  margin-bottom: 20px; letter-spacing: -.04em; line-height: 1;
  text-transform: uppercase;
}
.section-title em { font-style: italic; color: var(--accent); }
.section-text  { font-size: .95rem; color: var(--muted); line-height: 1.7; max-width: 560px; }
.feature-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 0; border: 2px solid var(--border); }
.card { background: var(--surface); border-right: 2px solid var(--border); padding: 28px; }
.card:last-child { border-right: none; }
.feature-icon {
  font-size: 1.4rem; color: var(--text); margin-bottom: 16px;
  font-weight: 900; line-height: 1;
}
.feature-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: .7rem; font-weight: 700; color: var(--muted);
  letter-spacing: .1em; text-transform: uppercase; margin-bottom: 12px;
}
.feature-card h3 {
  font-size: 1rem; font-weight: 900; margin-bottom: 8px;
  text-transform: uppercase; letter-spacing: -.01em;
}
.feature-card p  { font-size: .85rem; color: var(--muted); line-height: 1.6; }

/* ── FOOTER ─────────────────────────────────────────────── */
.site-footer {
  border-top: 1.5px solid var(--border); padding: 20px 0;
  text-align: center;
  font-size: .75rem; color: var(--muted);
  font-family: 'JetBrains Mono', monospace; letter-spacing: .04em;
}
.site-footer a { color: var(--text); text-decoration: none; font-weight: 700; }
.site-footer a:hover { color: var(--accent); }

/* ── RESPONSIVE ─────────────────────────────────────────── */
@media (max-width: 900px) {
  :root { --cell-size: 38px; }
  .game-board { flex-direction: column; }
  .grid-wrapper { overflow-x: auto; flex: none; width: 100%; }
  .clue-panel { max-width: 100%; min-width: 0; width: 100%; }
  .clue-list { max-height: 180px; }
  .clue-columns { flex-direction: row; gap: 12px; }
  .clue-col { flex: 1; }
  .feature-grid { grid-template-columns: 1fr; }
  .card { border-right: none; border-bottom: 2px solid var(--border); }
  .card:last-child { border-bottom: none; }
  .picker-buttons { flex-direction: column; }
  .diff-btn { border-right: none; border-bottom: 2px solid var(--border); }
  .diff-btn:last-child { border-bottom: none; }
  .puzzle-stats-bar .container { grid-template-columns: 1fr 1fr; }
  .stats-bar-item.right { display: none; }
}

@media (max-width: 560px) {
  .brand-sub { display: none; }
  .brand-text { display: none; }
  .site-nav a { display: none; }
  .nav-btn { padding: 0 14px; font-size: .68rem; }
  .nav-shell { height: 72px; }
  .tc-logo { height: 60px; }
  .puzzle-stats-bar .container { grid-template-columns: auto 1fr; gap: 8px; }
  .stats-bar-item.center { text-align: right; }
}

@media (max-width: 500px) {
  :root { --cell-size: 30px; }
  .cell-number { font-size: 7px; }
  .sum-chip { font-size: 9px; padding: 2px 5px; }
}

/* ── OVER-SUM SHAKE ──────────────────────────────────────── */
.clue-current.over { color: var(--accent); }
@keyframes overShake {
  0%,100% { transform: translateX(0); }
  20%     { transform: translateX(-5px); }
  50%     { transform: translateX(5px); }
  75%     { transform: translateX(-3px); }
}
.clue-current.shake { animation: overShake .35s ease; }

/* ── UNDO BUTTON ─────────────────────────────────────────── */
.undo-btn {
  background: none; border: 1.5px solid var(--border-lt);
  color: var(--muted); padding: 6px 10px;
  font-size: .72rem; font-weight: 800;
  cursor: pointer; font-family: inherit; transition: all .12s;
  text-transform: uppercase; letter-spacing: .08em; flex-shrink: 0;
}
.undo-btn:hover { border-color: var(--text); color: var(--text); }
.undo-btn:disabled { opacity: .3; cursor: default; }

/* ── LETTER REF TOGGLE ───────────────────────────────────── */
.letter-ref-toggle {
  position: absolute; top: 0; right: 56px;
  background: var(--text); color: var(--bg);
  border: none; padding: 4px 9px;
  font-size: .63rem; font-weight: 800;
  cursor: pointer; font-family: 'JetBrains Mono', monospace;
  letter-spacing: .06em; text-transform: uppercase;
  z-index: 20; transition: background .12s;
}
.letter-ref-toggle:hover { background: var(--accent); }
.letter-ref-popup {
  position: absolute; top: 28px; right: 56px;
  background: var(--surface); border: 2px solid var(--border);
  padding: 10px 12px; z-index: 30; min-width: 200px;
}
.letter-ref-popup[hidden] { display: none; }
.letter-ref-popup .letter-ref-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; }

/* ── TUTORIAL LETTER GRID (step 1) ───────────────────────── */
.tut-letter-grid {
  display: grid; grid-template-columns: repeat(7, 1fr); gap: 3px;
  margin: 10px 0 2px; padding: 10px 10px 8px;
  background: var(--bg); border: 1.5px solid var(--border-lt);
}
.tut-lv { display: flex; flex-direction: column; align-items: center; gap: 1px; }
.tut-lv-l { font-size: .7rem; font-weight: 800; color: var(--text); line-height: 1; }
.tut-lv-v { font-size: .6rem; color: var(--accent); font-family: 'JetBrains Mono', monospace; line-height: 1; }

/* ── TUTORIAL LIVE SUM ───────────────────────────────────── */
.tut-sum-live {
  display: flex; align-items: baseline; gap: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: .8rem; color: var(--muted);
  padding: 6px 0 2px;
}
.tut-sum-val {
  font-size: 1.4rem; font-weight: 900; color: var(--text);
  font-variant-numeric: tabular-nums; min-width: 36px; display: inline-block;
}
.tut-sum-live.correct .tut-sum-val { color: var(--correct); }
.tut-sum-live.over .tut-sum-val    { color: var(--accent); }

/* ── ARCHIVE MODAL ───────────────────────────────────────── */
.archive-list {
  list-style: none; display: flex; flex-direction: column; gap: 2px;
  max-height: 420px; overflow-y: auto; margin-top: 4px;
}
.archive-list::-webkit-scrollbar { width: 3px; }
.archive-list::-webkit-scrollbar-thumb { background: var(--border-lt); }
.archive-row {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; font-size: .88rem;
  background: var(--bg); border: 1px solid var(--border-lt);
  text-decoration: none; color: var(--text); transition: background .1s;
}
.archive-row:hover { background: #ede8e0; }
.archive-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: .72rem; color: var(--muted); min-width: 36px;
}
.archive-date { flex: 1; font-weight: 600; }
.archive-result { font-size: .78rem; color: var(--muted); font-family: 'JetBrains Mono', monospace; }
.archive-result.done { color: var(--correct); font-weight: 700; }

/* Archive mode stats-bar override */
.stats-bar-archive { color: var(--accent); font-weight: 700; }
.stats-bar-archive::before { content: '⟳ '; font-size: .7rem; }