:root {
  --green: #538d4e;
  --yellow: #b59f3b;
  --gray: #3a3a3c;
  --light-gray: #818384;
  --bg: #121213;
  --tile-bg: #121213;
  --tile-border: #3a3a3c;
  --tile-border-active: #565758;
  --text: #ffffff;
  --key-bg: #818384;
  --modal-bg: #1a1a1b;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Helvetica Neue', Arial, sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100dvh;
  overflow-x: hidden;
  touch-action: manipulation;
}

header {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 500px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--tile-border);
  position: relative;
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.icon-btn {
  background: none;
  border: none;
  color: var(--text);
  cursor: pointer;
  font-size: 1.2rem;
  padding: 4px 8px;
  position: absolute;
}

#help-btn {
  left: 16px;
  font-weight: 700;
  font-size: 1.4rem;
  width: 36px;
  height: 36px;
  border: 2px solid var(--light-gray);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

#stats-btn {
  right: 16px;
}

/* Mode toggle */
#mode-toggle {
  display: flex;
  gap: 0;
  border: 1px solid var(--tile-border);
  border-radius: 6px;
  overflow: hidden;
  margin: 8px auto 0;
}

.mode-btn {
  background: none;
  border: none;
  color: var(--light-gray);
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 6px 16px;
}

.mode-btn + .mode-btn {
  border-left: 1px solid var(--tile-border);
}

.mode-btn.active {
  background: var(--tile-border);
  color: var(--text);
}

main {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  flex: 1;
  width: 100%;
  max-width: 500px;
  padding: 20px 0;
}

/* Board */
#board {
  display: grid;
  grid-template-rows: repeat(6, 1fr);
  gap: 5px;
  padding: 10px 0;
  flex-shrink: 0;
}

.row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 5px;
}

.tile {
  width: 72px;
  height: 72px;
  border: 2px solid var(--tile-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.4rem;
  font-weight: 700;
  text-transform: uppercase;
  user-select: none;
  transition: transform 0.1s;
}

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

.tile.correct {
  background: var(--green);
  border-color: var(--green);
}

.tile.present {
  background: var(--yellow);
  border-color: var(--yellow);
}

.tile.absent {
  background: var(--gray);
  border-color: var(--gray);
}

.tile.flip {
  animation: flip 0.5s ease forwards;
}

@keyframes pop {
  0% { transform: scale(1); }
  50% { transform: scale(1.12); }
  100% { transform: scale(1); }
}

@keyframes flip {
  0% { transform: rotateX(0deg); }
  45% { transform: rotateX(90deg); }
  55% { transform: rotateX(90deg); }
  100% { transform: rotateX(0deg); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

.row.shake {
  animation: shake 0.4s ease;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  40% { transform: translateY(-20px); }
  60% { transform: translateY(-10px); }
}

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

/* Keyboard */
#keyboard {
  width: 100%;
  max-width: 500px;
  padding: 0 8px 12px;
}

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

.kb-row button {
  background: var(--key-bg);
  border: none;
  border-radius: 4px;
  color: var(--text);
  font-size: 1.1rem;
  font-weight: 700;
  padding: 14px 0;
  min-width: 36px;
  cursor: pointer;
  flex: 1;
  max-width: 44px;
  user-select: none;
  transition: background 0.2s;
}

.kb-row button:active {
  opacity: 0.7;
}

.kb-row button.wide-key {
  max-width: 68px;
  font-size: 1.1rem;
  padding: 14px 4px;
}

.kb-row button.correct {
  background: var(--green);
}

.kb-row button.present {
  background: var(--yellow);
}

.kb-row button.absent {
  background: var(--gray);
}

/* Toast */
#toast-container {
  position: fixed;
  top: 80px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  pointer-events: none;
}

.toast {
  background: var(--text);
  color: var(--bg);
  padding: 12px 24px;
  border-radius: 6px;
  font-weight: 700;
  font-size: 0.95rem;
  opacity: 1;
  transition: opacity 0.3s;
}

.toast.fade-out {
  opacity: 0;
}

/* Modals */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 500;
}

.modal.hidden {
  display: none;
}

.modal-content {
  background: var(--modal-bg);
  border-radius: 8px;
  padding: 28px 32px;
  max-width: 420px;
  width: 90%;
  position: relative;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-close {
  position: absolute;
  top: 12px;
  right: 16px;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.6rem;
  cursor: pointer;
}

.modal-content h2 {
  text-align: center;
  margin-bottom: 16px;
}

.modal-content h3 {
  text-align: center;
  margin: 16px 0 8px;
}

.modal-content p {
  margin: 8px 0;
  line-height: 1.5;
}

/* Help modal examples */
.example-row {
  display: flex;
  gap: 5px;
  margin: 12px 0;
}

.example-tile {
  width: 44px;
  height: 44px;
  border: 2px solid var(--tile-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  font-weight: 700;
}

.example-tile.correct {
  background: var(--green);
  border-color: var(--green);
}

.example-tile.present {
  background: var(--yellow);
  border-color: var(--yellow);
}

.example-tile.absent {
  background: var(--gray);
  border-color: var(--gray);
}

.help-divider {
  border: none;
  border-top: 1px solid var(--tile-border);
  margin: 16px 0;
}

.green-text { color: var(--green); }
.yellow-text { color: var(--yellow); }
.gray-text { color: var(--light-gray); }

/* Stats */
#stats-grid {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 16px;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat span {
  font-size: 2rem;
  font-weight: 700;
}

.stat label {
  font-size: 0.7rem;
  text-transform: uppercase;
  color: var(--light-gray);
}

/* Guess distribution */
#guess-distribution {
  padding: 0 8px;
}

.dist-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin: 4px 0;
}

.dist-row .dist-num {
  font-weight: 700;
  width: 12px;
  text-align: right;
}

.dist-row .dist-bar {
  background: var(--gray);
  padding: 2px 8px;
  font-weight: 700;
  font-size: 0.85rem;
  min-width: 24px;
  text-align: right;
  border-radius: 2px;
}

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

/* Share section */
#share-section {
  text-align: center;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--tile-border);
}

#share-section.hidden {
  display: none;
}

#next-puzzle-timer {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

#share-btn,
#result-share-btn {
  background: var(--green);
  color: var(--text);
  border: none;
  border-radius: 6px;
  padding: 14px 32px;
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

#share-btn:active,
#result-share-btn:active {
  opacity: 0.8;
}

/* Result modal */
#result-modal .modal-content {
  text-align: center;
}

#result-airport {
  font-size: 1rem;
  color: var(--light-gray);
  margin: 8px 0 20px;
}

/* Responsive */
@media (max-width: 400px) {
  .tile {
    width: 60px;
    height: 60px;
    font-size: 2rem;
  }

  header h1 {
    font-size: 1.5rem;
  }

  .kb-row button {
    font-size: 0.9rem;
    padding: 12px 0;
    min-width: 28px;
  }
}