:root {
  --green: #6aaa64;
  --yellow: #c9b458;
  --gray: #787c7e;
  --key-gray: #3a3a3c;
  --bg: #ffffff;
  --text: #1a1a1b;
  --border: #d3d6da;
  --border-filled: #878a8c;
  --header-bg: #ffffff;
  --key-bg: #d3d6da;
  --key-text: #1a1a1b;
  --modal-bg: #ffffff;
  --modal-overlay: rgba(0,0,0,0.5);
  --tile-size: 60px;
  --tile-gap: 5px;
}


/* ── Dark theme (toggled via JS) ── */
body.dark {
  --bg: #121213;
  --text: #ffffff;
  --border: #3a3a3c;
  --border-filled: #565758;
  --header-bg: #121213;
  --key-bg: #818384;
  --key-text: #ffffff;
  --modal-bg: #1a1a1b;
}

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

.seo-description {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100dvh;
  overflow-x: hidden;
}

/* ── Header ── */
header {
  width: 100%;
  background: var(--header-bg);
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner {
  max-width: 500px;
  margin: 0 auto;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
}
header h1 {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.header-right { display: flex; gap: 4px; }
.header-border { border-bottom: 1px solid var(--border); }

.icon-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text);
  padding: 6px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}
.icon-btn:hover { background: var(--border); }
.icon-btn svg { width: 22px; height: 22px; }

/* ── Toast ── */
#toast-container {
  position: fixed;
  top: 60px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  pointer-events: none;
}
.toast {
  background: var(--text);
  color: var(--bg);
  padding: 10px 16px;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 600;
  animation: toast-in 0.2s ease;
  white-space: nowrap;
}
@keyframes toast-in {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Main layout ── */
main {
  flex: 1;
  width: 100%;
  max-width: 500px;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 12px 8px 8px;
  gap: 12px;
}

/* ── Counters ── */
#counters {
  display: flex;
  gap: 32px;
  justify-content: center;
}
.counter { text-align: center; }
.counter-value {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  transition: color 0.4s ease;
}
.counter-value.count-ok     { color: var(--green); }
.counter-value.count-warn   { color: var(--yellow); }
.counter-value.count-danger { color: #e53e3e; }
@keyframes count-tick {
  0%   { transform: translateY(-6px); opacity: 0.4; }
  100% { transform: translateY(0);    opacity: 1; }
}
.counter-value.tick { animation: count-tick 0.22s ease; }
.counter-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.7;
  margin-top: 2px;
}

/* ── Board ── */
#board-container {
  display: flex;
  justify-content: center;
  align-items: center;
  flex: 1;
  width: 100%;
}
#board {
  --ts: min(var(--tile-size), calc((min(100vw, 500px) - 32px - 4 * var(--tile-gap)) / 5));
  display: grid;
  grid-template-columns: repeat(5, var(--ts));
  gap: var(--tile-gap);
}

.tile {
  width: var(--ts);
  height: var(--ts);
  border: 2px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: calc(var(--ts, 60px) * 0.5);
  font-weight: 700;
  text-transform: uppercase;
  user-select: none;
  transition: border-color 0.05s;
  position: relative;
}
.tile[data-letter] { border-color: var(--border-filled); }
.tile.pop { animation: pop 0.1s ease; }
@keyframes pop {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.12); }
  100% { transform: scale(1); }
}
.tile.shake { animation: shake 0.5s ease; }
@keyframes shake {
  0%,100% { transform: translateX(0); }
  20%     { transform: translateX(-4px); }
  40%     { transform: translateX(4px); }
  60%     { transform: translateX(-4px); }
  80%     { transform: translateX(4px); }
}
.tile.flip {
  animation: flip 0.5s ease forwards;
}
@keyframes flip {
  0%   { transform: rotateX(0); }
  50%  { transform: rotateX(-90deg); }
  100% { transform: rotateX(0); }
}
.tile.correct  { background: var(--green);  border-color: var(--green);  color: #fff; }
.tile.present  { background: var(--yellow); border-color: var(--yellow); color: #fff; }
.tile.absent   { background: var(--gray);   border-color: var(--gray);   color: #fff; }

/* In how-to-play modal, tiles are pre-coloured */
.htp-tiles { display: flex; gap: 4px; margin: 8px 0; }
.htp-tiles .tile {
  width: 40px; height: 40px;
  font-size: 1.1rem;
  border-color: var(--border-filled);
}
.htp-tiles .tile.correct  { background: var(--green);  border-color: var(--green);  color:#fff; }
.htp-tiles .tile.present  { background: var(--yellow); border-color: var(--yellow); color:#fff; }
.htp-tiles .tile.absent   { background: var(--gray);   border-color: var(--gray);   color:#fff; }

/* ── Keyboard ── */
#keyboard {
  width: 100%;
  max-width: 500px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 0 6px;
}
.key-row {
  display: flex;
  gap: 4px;
}
.key {
  flex: 1;
  min-width: 0;
  height: 56px;
  padding: 0 2px;
  border: none;
  border-radius: 6px;
  background: var(--key-bg);
  color: var(--key-text);
  font-size: clamp(0.6rem, 2.5vw, 0.9rem);
  font-weight: 600;
  cursor: pointer;
  text-transform: uppercase;
  transition: background 0.2s, color 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  white-space: nowrap;
}
.key.wide { flex: 1.6; font-size: clamp(0.55rem, 2.2vw, 0.78rem); }
.key.correct  { background: var(--green);  color: #fff; }
.key.present  { background: var(--yellow); color: #fff; }
.key.absent   { background: var(--key-gray); color: #fff; }

/* ── Game result panel ── */
#result-panel {
  width: 100%;
  text-align: center;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  animation: toast-in 0.3s ease;
}
#result-panel .result-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 4px;
}
#result-panel .result-word {
  font-size: 0.9rem;
  opacity: 0.75;
  margin-bottom: 12px;
}
#result-panel .result-actions {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── Puzzle number ── */
.puzzle-num {
  font-size: 0.6rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  opacity: 0.45;
  margin-left: 7px;
  vertical-align: middle;
  text-transform: none;
}

/* ── Practice badge ── */
.practice-badge {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: var(--yellow);
  color: #fff;
  padding: 2px 7px;
  border-radius: 20px;
  margin-left: 8px;
  vertical-align: middle;
}

/* ── Undo button ── */
#undo-area {
  display: flex;
  gap: 8px;
  justify-content: center;
}
.btn-undo, .btn-random {
  background: none;
  border: 2px solid var(--border-filled);
  color: var(--text);
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}
.btn-undo:hover, .btn-random:hover { background: var(--border); }
.btn-primary {
  background: var(--text);
  color: var(--bg);
  border: none;
  padding: 10px 24px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 0.05em;
  transition: opacity 0.15s;
}
.btn-primary:hover { opacity: 0.85; }

/* ── Modals ── */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--modal-overlay);
  z-index: 50;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
.modal-overlay.open { display: flex; }
.modal {
  background: var(--modal-bg);
  border-radius: 12px;
  width: 100%;
  max-width: 420px;
  max-height: 85dvh;
  overflow-y: auto;
  box-shadow: 0 4px 32px rgba(0,0,0,0.3);
  animation: modal-in 0.2s ease;
}
@keyframes modal-in {
  from { opacity: 0; transform: scale(0.96) translateY(8px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px 0;
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
}
.modal-header h2 {
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.modal-close {
  background: none;
  border: none;
  font-size: 1.1rem;
  cursor: pointer;
  color: var(--text);
  padding: 4px 6px;
  border-radius: 4px;
  opacity: 0.7;
  transition: opacity 0.15s;
}
.modal-close:hover { opacity: 1; }
.modal-body {
  padding: 16px 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 0.9rem;
  line-height: 1.5;
}
.modal-body h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 4px;
}
.htp-examples { display: flex; flex-direction: column; gap: 10px; }
.htp-example { border-left: 3px solid var(--border); padding-left: 12px; }
.htp-warning {
  background: rgba(201,180,88,0.15);
  border: 1px solid var(--yellow);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 0.85rem;
}

/* ── Stats ── */
#stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  text-align: center;
}
.stat-block .stat-val {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
}
.stat-block .stat-label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  opacity: 0.7;
  margin-top: 3px;
}
#result-dist { display: flex; flex-direction: column; gap: 6px; }
.dist-row { display: flex; align-items: center; gap: 8px; font-size: 0.82rem; }
.dist-label { width: 72px; text-align: right; font-weight: 600; opacity: 0.85; }
.dist-bar-wrap { flex: 1; }
.dist-bar {
  min-width: 28px;
  height: 22px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 6px;
  font-size: 0.78rem;
  font-weight: 700;
  color: #fff;
  transition: width 0.4s ease;
}
.survived-bar  { background: var(--green); }
.eliminated-bar { background: var(--gray); }
.wordled-bar   { background: #e53e3e; }

#stats-footer {
  border-top: 1px solid var(--border);
  padding-top: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.next-label { font-size: 0.7rem; text-transform: uppercase; opacity: 0.7; letter-spacing: 0.05em; }
#countdown { font-size: 1.4rem; font-weight: 700; font-variant-numeric: tabular-nums; }

/* ── Settings ── */
.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 4px 0;
}
.setting-title { font-weight: 600; font-size: 0.95rem; }
.setting-desc  { font-size: 0.78rem; opacity: 0.65; margin-top: 2px; }
.setting-divider { border-top: 1px solid var(--border); margin: 4px 0; }
.setting-link-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 4px 0;
}
.setting-links { display: flex; gap: 8px; }
.setting-link {
  background: none;
  border: none;
  color: var(--green);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0;
  text-decoration: none;
}
.setting-link:hover { text-decoration: underline; }
.modal-body a { color: var(--green); }
.toggle { position: relative; display: inline-block; width: 44px; height: 24px; cursor: pointer; }
.toggle input { position: absolute; opacity: 0; width: 100%; height: 100%; margin: 0; cursor: pointer; }
.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--border-filled);
  border-radius: 24px;
  transition: background 0.2s;
}
.toggle-slider::before {
  content: '';
  position: absolute;
  width: 18px; height: 18px;
  left: 3px; top: 3px;
  background: #fff;
  border-radius: 50%;
  transition: transform 0.2s;
}
.toggle input:checked + .toggle-slider { background: var(--green); }
.toggle input:checked + .toggle-slider::before { transform: translateX(20px); }

.hidden { display: none !important; }

/* ── Responsive ── */
@media (max-height: 700px) {
  :root { --tile-size: 48px; --tile-gap: 4px; }
  .key { height: 46px; }
  #counters { gap: 20px; }
  .counter-value { font-size: 1.6rem; }
  main { gap: 8px; padding: 8px 6px 4px; }
}
@media (max-height: 600px) {
  :root { --tile-size: 42px; --tile-gap: 4px; }
  .key { height: 40px; }
  .counter-value { font-size: 1.4rem; }
}
/* Tall phones — give board more room */
@media (min-height: 800px) {
  :root { --tile-size: 65px; }
}