:root {
  --bg: #ffffff;
  --text: #1a1a1b;
  --border: #d3d6da;
  --border-filled: #878a8c;
  --key-bg: #d3d6da;
  --key-text: #1a1a1b;
  --correct: #6aaa64;
  --present: #c9b458;
  --absent: #787c7e;
  --modal-bg: #ffffff;
  --overlay: rgba(255, 255, 255, 0.5);
  --muted: #787c7e;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121213;
    --text: #ffffff;
    --border: #3a3a3c;
    --border-filled: #565758;
    --key-bg: #818384;
    --key-text: #ffffff;
    --correct: #538d4e;
    --present: #b59f3b;
    --absent: #3a3a3c;
    --modal-bg: #121213;
    --overlay: rgba(0, 0, 0, 0.5);
    --muted: #818384;
  }
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  height: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Helvetica Neue", Arial, sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow: hidden;
}

button {
  font-family: inherit;
  cursor: pointer;
}

/* Header */
header {
  width: 100%;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

h1 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-btn {
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.3rem;
  width: 40px;
  height: 40px;
  border-radius: 50%;
}

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

.text-btn {
  background: none;
  border: 1px solid var(--border-filled);
  border-radius: 999px;
  color: var(--text);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 6px 12px;
  transition: background-color 0.15s, color 0.15s;
}

.text-btn:hover {
  background: var(--text);
  color: var(--bg);
}

#help-btn {
  font-weight: 700;
  border: 2px solid var(--text);
  width: 28px;
  height: 28px;
  font-size: 1rem;
  line-height: 1;
  padding: 0;
}

/* Board */
main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 0;
}

#board {
  display: grid;
  gap: 5px;
  padding: 10px;
  width: min(350px, calc(100vw - 16px), calc((100vh - 290px) * 5 / 6));
}

.row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 5px;
}

.row.shake {
  animation: shake 0.6s;
}

.tile {
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--border);
  font-size: 2rem;
  font-weight: 700;
  text-transform: uppercase;
  user-select: none;
  aspect-ratio: 1;
}

.tile.filled {
  border-color: var(--border-filled);
  animation: pop 0.1s;
}

.tile.correct,
.tile.present,
.tile.absent {
  color: #ffffff;
  border-color: transparent;
}

.tile.correct { background: var(--correct); }
.tile.present { background: var(--present); }
.tile.absent  { background: var(--absent); }

.tile.flip {
  animation: flip-in 0.25s ease-in forwards;
}

.tile.flip-out {
  animation: flip-out 0.25s ease-out forwards;
}

.tile.bounce {
  animation: bounce 0.5s;
}

@keyframes pop {
  0%   { transform: scale(0.8); opacity: 0; }
  40%  { transform: scale(1.1); opacity: 1; }
}

@keyframes flip-in {
  from { transform: rotateX(0); }
  to   { transform: rotateX(-90deg); }
}

@keyframes flip-out {
  from { transform: rotateX(-90deg); }
  to   { transform: rotateX(0); }
}

@keyframes shake {
  10%, 90% { transform: translateX(-1px); }
  20%, 80% { transform: translateX(2px); }
  30%, 50%, 70% { transform: translateX(-4px); }
  40%, 60% { transform: translateX(4px); }
}

@keyframes bounce {
  0%, 20%  { transform: translateY(0); }
  40%      { transform: translateY(-30px); }
  50%      { transform: translateY(5px); }
  60%      { transform: translateY(-15px); }
  80%      { transform: translateY(2px); }
  100%     { transform: translateY(0); }
}

/* Keyboard */
#keyboard {
  width: 100%;
  max-width: 500px;
  padding: 0 8px 8px;
  flex-shrink: 0;
  user-select: none;
}

.key-row {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin-bottom: 8px;
}

.key {
  flex: 1;
  height: 58px;
  border: none;
  border-radius: 4px;
  background: var(--key-bg);
  color: var(--key-text);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  -webkit-tap-highlight-color: transparent;
  transition: background-color 0.1s;
}

.key.wide {
  flex: 1.5;
  font-size: 0.75rem;
}

.key-spacer {
  flex: 0.5;
}

.key.correct, .key.present, .key.absent {
  color: #ffffff;
}

.key.correct { background: var(--correct); }
.key.present { background: var(--present); }
.key.absent  { background: var(--absent); }

/* Toasts */
#toasts {
  position: fixed;
  top: 70px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 20;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  pointer-events: none;
}

.toast {
  background: var(--text);
  color: var(--bg);
  padding: 12px 16px;
  border-radius: 4px;
  font-weight: 700;
  font-size: 0.9rem;
  transition: opacity 0.3s;
}

.toast.fade {
  opacity: 0;
}

/* Modals */
.modal {
  position: fixed;
  inset: 0;
  background: var(--overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  padding: 16px;
}

.modal.hidden,
.hidden {
  display: none;
}

.modal-content {
  position: relative;
  background: var(--modal-bg);
  color: var(--text);
  border-radius: 8px;
  box-shadow: 0 4px 23px rgba(0, 0, 0, 0.2);
  padding: 24px;
  width: 100%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
  animation: slide-in 0.2s ease-out;
}

@keyframes slide-in {
  from { transform: translateY(30px); opacity: 0; }
  to   { transform: translateY(0); opacity: 1; }
}

.modal-content h2 {
  margin-top: 0;
  text-align: center;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.modal-content h3 {
  text-align: center;
  font-size: 0.9rem;
  text-transform: uppercase;
}

.close-btn {
  position: absolute;
  top: 12px;
  right: 16px;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.6rem;
  line-height: 1;
}

.example {
  display: flex;
  gap: 4px;
}

.example .tile {
  width: 40px;
  height: 40px;
  font-size: 1.4rem;
}

.muted {
  color: var(--muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
  padding-top: 12px;
}

/* Stats */
.stats-row {
  display: flex;
  justify-content: center;
  gap: 8px;
}

.stat {
  flex: 1;
  max-width: 80px;
  text-align: center;
}

.stat-num {
  font-size: 2.2rem;
  font-weight: 400;
}

.stat-label {
  font-size: 0.75rem;
}

.dist-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 4px;
  font-size: 0.85rem;
}

.dist-bar {
  background: var(--absent);
  color: #ffffff;
  font-weight: 700;
  text-align: right;
  padding: 2px 8px;
  min-width: 7%;
}

.dist-bar.highlight {
  background: var(--correct);
}

.stats-footer {
  display: flex;
  align-items: center;
  margin-top: 20px;
}

.stats-footer.hidden {
  display: none;
}

.countdown {
  flex: 1;
  text-align: center;
  border-right: 1px solid var(--text);
}

#countdown {
  font-size: 2rem;
}

#share-btn {
  flex: 1;
  margin-left: 16px;
  height: 52px;
  border: none;
  border-radius: 4px;
  background: var(--correct);
  color: #ffffff;
  font-size: 1.1rem;
  font-weight: 700;
  text-transform: uppercase;
}

@media (max-height: 600px) {
  .key { height: 46px; }
  h1 { font-size: 1.5rem; }
}