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

:root {
  --bg-color: #121213;
  --tile-bg: #3a3a3c;
  --tile-border: #3a3a3c;
  --key-bg: #818384;
  --key-text: #ffffff;
  --text-color: #ffffff;
  --text-secondary: #818384;
  --green: #538d4e;
  --yellow: #b59f3b;
  --player1-color: #c9534a;
  --player2-color: #4a8bc9;
  --cta-bg: #3a3a3c;
  --cta-disabled: #2a2a2b;
}

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  overflow: hidden;
}

#app {
  height: 100%;
  max-width: 500px;
  margin: 0 auto;
}

.screen {
  display: none;
  height: 100%;
  flex-direction: column;
}

.screen.active {
  display: flex;
}

.landing-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px;
  gap: 20px;
}

.logo {
  margin-bottom: 10px;
}

.logo-grid {
  display: grid;
  grid-template-columns: repeat(3, 24px);
  grid-template-rows: 24px;
  gap: 4px;
}

.logo-cell {
  width: 24px;
  height: 24px;
  background-color: var(--tile-bg);
  border-radius: 2px;
}

.logo-cell.green {
  background-color: var(--green);
}

.logo-cell.yellow {
  background-color: var(--yellow);
}

.title {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: 2px;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 30px;
}

.input-container {
  width: 100%;
  max-width: 300px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.input-container label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-align: center;
}

.input-container input {
  width: 100%;
  padding: 16px;
  font-size: 1.1rem;
  background-color: var(--tile-bg);
  border: 2px solid var(--tile-border);
  border-radius: 8px;
  color: var(--text-color);
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 2px;
}

.input-container input:focus {
  outline: none;
  border-color: var(--text-secondary);
}

.input-container input::placeholder {
  color: var(--text-secondary);
  text-transform: none;
  letter-spacing: normal;
}

.cta-button {
  width: 100%;
  max-width: 300px;
  padding: 16px 32px;
  font-size: 1.1rem;
  font-weight: 600;
  background-color: var(--cta-bg);
  color: var(--text-color);
  border: none;
  border-radius: 30px;
  cursor: pointer;
  margin-top: 20px;
  transition: background-color 0.2s, opacity 0.2s;
}

.cta-button:disabled {
  background-color: var(--cta-disabled);
  color: var(--text-secondary);
  cursor: not-allowed;
}

.cta-button:not(:disabled):hover {
  background-color: #4a4a4c;
}

.game-header {
  padding: 16px;
  text-align: center;
  border-bottom: 1px solid var(--tile-border);
}

.game-header h2 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 2px;
  margin-bottom: 8px;
}

.turn-indicator {
  font-size: 0.9rem;
}

#current-player {
  padding: 4px 12px;
  border-radius: 4px;
  font-weight: 500;
}

#current-player.player1 {
  background-color: var(--player1-color);
}

#current-player.player2 {
  background-color: var(--player2-color);
}

.starting-word-container {
  padding: 20px 10px;
  display: flex;
  justify-content: center;
}

.word-tiles {
  display: flex;
  flex-wrap: nowrap;
  justify-content: center;
  gap: 4px;
  max-width: 100%;
  padding: 0 10px;
}

.letter-tile {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--tile-bg);
  border: 2px solid var(--tile-border);
  border-radius: 4px;
  font-size: 1.4rem;
  font-weight: 700;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.15s;
  user-select: none;
}

.letter-tile:not(.used):active {
  transform: scale(0.95);
}

.letter-tile.used {
  background-color: var(--green);
  border-color: var(--green);
  cursor: default;
  opacity: 0.8;
}

.current-input-container {
  padding: 10px 20px;
  min-height: 50px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.current-input {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--text-color);
  min-height: 40px;
}

.words-history {
  flex: 1;
  overflow-y: auto;
  padding: 10px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.word-bubble {
  max-width: 70%;
  padding: 10px 16px;
  border-radius: 18px;
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  animation: popIn 0.2s ease-out;
}

@keyframes popIn {
  0% {
    transform: scale(0.8);
    opacity: 0;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

.word-bubble.player1 {
  align-self: flex-start;
  background-color: var(--player1-color);
}

.word-bubble.player2 {
  align-self: flex-end;
  background-color: var(--player2-color);
}

.actions-container {
  display: flex;
  gap: 10px;
  padding: 16px;
  justify-content: center;
}

.action-btn {
  flex: 1;
  max-width: 140px;
  padding: 14px 20px;
  font-size: 1rem;
  font-weight: 600;
  background-color: var(--tile-bg);
  color: var(--text-color);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.1s;
}

.action-btn:active {
  background-color: #4a4a4c;
}

.action-btn.submit {
  background-color: var(--green);
}

.action-btn.submit:active {
  background-color: #4a7d42;
}

.error-message {
  position: fixed;
  top: 80px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--text-color);
  color: var(--bg-color);
  padding: 12px 20px;
  border-radius: 4px;
  font-size: 0.9rem;
  font-weight: 600;
  z-index: 100;
  animation: fadeInOut 2s ease-in-out forwards;
}

@keyframes fadeInOut {
  0% { opacity: 0; transform: translateX(-50%) translateY(-10px); }
  15% { opacity: 1; transform: translateX(-50%) translateY(0); }
  85% { opacity: 1; transform: translateX(-50%) translateY(0); }
  100% { opacity: 0; transform: translateX(-50%) translateY(-10px); }
}

@media (max-height: 600px) {
  .letter-tile {
    width: 36px;
    height: 36px;
    font-size: 1.1rem;
  }
  
  .key {
    height: 44px;
  }
  
  .current-input {
    font-size: 1.4rem;
  }
}