#tetris-open-btn,
.tetris-open-btn {
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 99998;
  border: 0;
  border-radius: 999px;
  background: linear-gradient(135deg, #7c3aed, #2563eb);
  color: #fff;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 12px 18px;
  cursor: pointer;
  box-shadow: 0 10px 30px rgba(37, 99, 235, 0.35);
}

#tetris-open-btn:hover,
#tetris-open-btn:focus-visible {
  transform: translateY(-1px);
  box-shadow: 0 14px 34px rgba(37, 99, 235, 0.45);
}

#tetris-modal[hidden] {
  display: none !important;
}

#tetris-modal,
.tetris-modal {
  position: fixed;
  inset: 0;
  z-index: 99999;
  display: flex;
  align-items: center;
  justify-content: center;
}

#tetris-modal .tetris-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.72);
}

#tetris-modal .tetris-dialog {
  position: relative;
  z-index: 2;
  width: min(92vw, 680px);
  max-height: 90vh;
  overflow: auto;
  background: #ffffff;
  color: #111827;
  border-radius: 20px;
  padding: 24px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.35);
}

#tetris-close-btn,
.tetris-close-btn {
  position: absolute;
  top: 10px;
  right: 12px;
  z-index: 3;
  border: 0;
  background: transparent;
  font-size: 34px;
  line-height: 1;
  cursor: pointer;
  color: #111827;
}

#tetris-modal .tetris-layout {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  flex-wrap: wrap;
}

#tetris-canvas {
  display: block;
  width: 240px;
  max-width: 100%;
  background: #111827;
  border-radius: 12px;
}

#tetris-modal .tetris-sidebar {
  flex: 1;
  min-width: 180px;
}

#tetris-modal .tetris-panel {
  background: #f3f4f6;
  border-radius: 14px;
  padding: 14px;
  margin-bottom: 12px;
}

#tetris-modal .tetris-label {
  display: block;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #6b7280;
  margin-bottom: 4px;
}

#tetris-modal .tetris-panel ul {
  margin: 0;
  padding-left: 18px;
}

#tetris-modal .tetris-panel button {
  border: 0;
  border-radius: 10px;
  background: #111827;
  color: #fff;
  padding: 10px 14px;
  cursor: pointer;
}

body.tetris-modal-open {
  overflow: hidden;
}

@media (max-width: 640px) {
  #tetris-open-btn {
    top: 14px;
    right: 14px;
    padding: 10px 14px;
  }

  #tetris-modal .tetris-dialog {
    padding: 18px;
  }
}