#p2p-volleyball-wrapper {
  max-width: 800px;
  margin: 0 auto;
  padding: 30px;
  background: #ffffff;
  border: 1px solid #d3d6da;
  border-radius: 20px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.06);
  text-align: center;
}
#p2p-volleyball-wrapper h2 {
  margin-top: 0;
  font-weight: 900;
  color: #121212;
  font-size: 26px;
  margin-bottom: 25px;
}

/* 모드 선택 카드 레이아웃 */
#mode-selection {
  display: flex;
  gap: 20px;
  justify-content: center;
  margin-bottom: 20px;
}
.mode-card {
  flex: 1;
  padding: 30px 20px;
  background: #f8fafc;
  border: 2px solid #e5e7eb;
  border-radius: 16px;
  cursor: pointer;
  transition: all 0.2s ease;
}
.mode-card:hover {
  border-color: #9dff20;
  background: #ffffff;
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(157, 255, 32, 0.15);
}
.mode-card h3 {
  margin: 0 0 10px 0;
  font-size: 20px;
  font-weight: 800;
  color: #111827;
}
.mode-card p {
  margin: 0;
  font-size: 14px;
  color: #6b7280;
  word-break: keep-all;
}

#webrtc-setup-panel {
  display: none;
  margin-bottom: 20px;
  padding: 25px;
  background: #fff;
  border: 1px solid #e5e5e5;
  border-radius: 16px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.03);
}
.vb-btn {
  padding: 12px 24px;
  margin: 5px 4px;
  background: #9dff20;
  color: #121212;
  border: none;
  border-radius: 8px;
  font-weight: 800;
  font-size: 15px;
  cursor: pointer;
  transition:
    transform 0.1s,
    background 0.2s;
}
.vb-btn:hover {
  background: #8ce61c;
}
.vb-btn:active {
  transform: scale(0.95);
}
.vb-btn.secondary {
  background: #121212;
  color: #fff;
}
.vb-btn.secondary:hover {
  background: #333;
}
.vb-btn.outline {
  background: transparent;
  border: 2px solid #e5e7eb;
  color: #4b5563;
}
.vb-btn.outline:hover {
  background: #f3f4f6;
  color: #111827;
  border-color: #d1d5db;
}

.setup-section {
  display: none;
  margin-top: 15px;
  text-align: left;
}
.setup-section p {
  font-size: 14px;
  color: #374151;
  margin-bottom: 10px;
}
.setup-section textarea {
  width: 100%;
  height: 80px;
  padding: 10px;
  box-sizing: border-box;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  font-size: 13px;
  resize: none;
  background: #f9fafb;
  transition: border-color 0.2s;
}
.setup-section textarea:focus {
  outline: none;
  border-color: #111827;
}

#game-container {
  display: none;
  margin-top: 20px;
}
#volleyball-canvas {
  display: block;
  background: linear-gradient(180deg, #87ceeb 0%, #e0f6ff 100%);
  margin: 0 auto;
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  max-width: 100%;
  height: auto;
}
#vb-status {
  margin-top: 15px;
  font-weight: bold;
  color: #ef4444;
  padding: 10px;
  border-radius: 8px;
  background: #fef2f2;
  display: none;
}
.controls-hint {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: #6b7280;
  margin-top: 15px;
  padding: 0 10px;
}
.controls-hint span {
  background: #f3f4f6;
  padding: 6px 12px;
  border-radius: 6px;
  font-weight: 600;
}
@media (max-width: 767px) {
  #mobile-warning {
    display: block !important;
  }
  .controls-hint {
    display: none !important;
  }
}