* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  user-select: none;
  -webkit-user-select: none;
}

body {
  background-color: #0d1117;
  color: #ffffff;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 10px;
  overflow-x: hidden;
}

.app-container {
  width: 100%;
  max-width: 420px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

/* Header & Logo */
.header {
  width: 100%;
  text-align: center;
  padding: 5px 0;
}

.logo {
  max-width: 180px;
  height: auto;
  object-fit: contain;
}

/* Score Board */
.score-board {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  background: #161b22;
  padding: 10px;
  border-radius: 12px;
  border: 1px solid #30363d;
}

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

.score-item .label {
  font-size: 10px;
  color: #8b949e;
  font-weight: bold;
}

.score-item .value {
  font-size: 16px;
  color: #58a6ff;
  font-weight: bold;
}

/* Game Area */
.game-area {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  gap: 10px;
  width: 100%;
}

#tetris {
  background: #010409;
  border: 3px solid #30363d;
  border-radius: 8px;
  max-width: 75vw;
  max-height: 48vh;
  height: auto;
  box-shadow: 0 8px 24px rgba(0,0,0,0.5);
}

.next-piece-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: #161b22;
  padding: 8px;
  border-radius: 8px;
  border: 1px solid #30363d;
}

.next-piece-container .label {
  font-size: 10px;
  color: #8b949e;
  margin-bottom: 4px;
}

#next {
  background: #010409;
  border-radius: 4px;
}

/* Action Buttons */
.action-buttons {
  display: flex;
  gap: 10px;
  width: 100%;
}

.btn {
  flex: 1;
  padding: 12px;
  border: none;
  border-radius: 8px;
  font-weight: bold;
  font-size: 14px;
  cursor: pointer;
}

.btn.primary {
  background: #238636;
  color: #ffffff;
}

.btn.secondary {
  background: #21262d;
  color: #c9d1d9;
  border: 1px solid #30363d;
}

/* Touch Controls */
.touch-controls {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
}

.control-row {
  display: flex;
  justify-content: center;
  gap: 12px;
  width: 100%;
}

.btn-ctrl {
  width: 55px;
  height: 50px;
  background: #21262d;
  border: 1px solid #30363d;
  color: #ffffff;
  font-size: 18px;
  font-weight: bold;
  border-radius: 8px;
  display: flex;
  justify-content: center;
  align-items: center;
  touch-action: manipulation;
}

.btn-ctrl:active {
  background: #1f6feb;
}

.btn-wide {
  width: 180px;
  font-size: 12px;
  background: #1f6feb;
}