* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  background: var(--tg-theme-bg-color, #ffffff);
  color: var(--tg-theme-text-color, #000000);
}

#app {
  max-width: 480px;
  margin: 0 auto;
  height: 100%;
  display: flex;
  flex-direction: column;
  padding: 16px;
  overflow: hidden;
}

@media (min-width: 640px) {
  html, body {
    background: #e5e5ea;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  #app {
    height: 90vh;
    max-height: 800px;
    width: 100%;
    max-width: 420px;
    border-radius: 24px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
    background: var(--tg-theme-bg-color, #ffffff);
    overflow: hidden;
    padding: 20px;
  }
}

header {
  text-align: center;
  margin-bottom: 20px;
}

header h1 {
  font-size: 22px;
  font-weight: 700;
  color: var(--tg-theme-text-color, #000000);
}

.screen {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  gap: 16px;
  animation: fadeIn 0.2s ease;
}

.screen.active {
  display: flex;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.player-info {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--tg-theme-hint-color, #999999);
}

.menu-buttons {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
}

.btn {
  width: 100%;
  padding: 14px 20px;
  border: none;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.1s, opacity 0.1s;
  outline: none;
}

.btn:active {
  transform: scale(0.98);
  opacity: 0.9;
}

.btn.primary {
  background: var(--tg-theme-button-color, #2481cc);
  color: var(--tg-theme-button-text-color, #ffffff);
}

.btn.secondary {
  background: var(--tg-theme-secondary-bg-color, #f1f1f1);
  color: var(--tg-theme-text-color, #000000);
}

.btn.ghost {
  background: transparent;
  color: var(--tg-theme-link-color, #2481cc);
}

.btn.small {
  padding: 8px 14px;
  font-size: 14px;
  width: auto;
}

.input {
  width: 100%;
  padding: 14px;
  font-size: 18px;
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 4px;
  border: 2px solid var(--tg-theme-hint-color, #cccccc);
  border-radius: 12px;
  background: var(--tg-theme-bg-color, #ffffff);
  color: var(--tg-theme-text-color, #000000);
  outline: none;
}

.input:focus {
  border-color: var(--tg-theme-button-color, #2481cc);
}

.room-code-box {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--tg-theme-secondary-bg-color, #f1f1f1);
  padding: 16px 24px;
  border-radius: 16px;
}

.room-code {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: 6px;
  font-family: 'Courier New', Courier, monospace;
  color: var(--tg-theme-text-color, #000000);
}

#room-status {
  font-size: 14px;
  color: var(--tg-theme-hint-color, #888888);
}

.game-header {
  width: 100%;
  text-align: center;
  margin-bottom: 8px;
}

.score {
  display: flex;
  justify-content: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
  flex-wrap: wrap;
}

.turn-indicator {
  font-size: 15px;
  font-weight: 700;
  color: var(--tg-theme-hint-color, #666666);
}

.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 10px;
  width: 100%;
  max-width: 340px;
  aspect-ratio: 1;
  margin: 0 auto;
}

.cell {
  background: var(--tg-theme-secondary-bg-color, #f1f1f1);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
  font-weight: 700;
  cursor: pointer;
  user-select: none;
  transition: background 0.15s;
  color: var(--tg-theme-text-color, #000000);
  aspect-ratio: 1 / 1;
  overflow: hidden;
  min-height: 0;
  min-width: 0;
}

.cell:active {
  background: var(--tg-theme-hint-color, #e0e0e0);
}

.cell.x {
  color: #e74c3c;
}

.cell.o {
  color: #3498db;
}

.cell.winner {
  background: #2ecc71;
  color: #fff;
}

.game-message {
  min-height: 24px;
  font-size: 18px;
  font-weight: 700;
  text-align: center;
  color: var(--tg-theme-text-color, #000000);
}

.game-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
}

.hidden {
  display: none !important;
}

#btn-share-tg {
  margin-top: 8px;
}