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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  color: #333;
}

.app {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

/* Loading Screen */
.loading-screen {
  text-align: center;
  color: white;
}

.spinner {
  width: 50px;
  height: 50px;
  border: 4px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 20px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Join Screen */
.join-screen {
  width: 100%;
  max-width: 600px;
}

.join-container {
  background: white;
  border-radius: 16px;
  padding: 40px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.logo {
  text-align: center;
  margin-bottom: 32px;
}

.logo h1 {
  font-size: 36px;
  margin-bottom: 8px;
  color: #667eea;
}

.logo p {
  color: #666;
  font-size: 14px;
}

.preview-section {
  position: relative;
  background: #000;
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 24px;
  aspect-ratio: 16 / 9;
}

.preview-section video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.preview-controls {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 12px;
}

.btn-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
  border: none;
  color: white;
  font-size: 20px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-icon:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: scale(1.1);
}

.btn-icon.active {
  background: #4caf50;
}

.btn-icon.btn-danger {
  background: rgba(244, 67, 54, 0.8);
}

.btn-icon.btn-danger:hover {
  background: rgba(244, 67, 54, 1);
}

.join-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}

.join-form input {
  padding: 14px 18px;
  border: 2px solid #eee;
  border-radius: 8px;
  font-size: 16px;
  transition: border-color 0.2s;
}

.join-form input:focus {
  outline: none;
  border-color: #667eea;
}

.btn-primary {
  padding: 16px 32px;
  background: #667eea;
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 18px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-primary:hover {
  background: #5568d3;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.btn-primary:active {
  transform: translateY(0);
}

.room-info {
  text-align: center;
  padding: 16px;
  background: #f5f5f5;
  border-radius: 8px;
  font-size: 14px;
  color: #666;
}

.room-info strong {
  color: #333;
  font-family: monospace;
}

/* Call Screen */
.call-screen {
  width: 100%;
  max-width: 1400px;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

.video-wrapper {
  position: relative;
  background: #000;
  border-radius: 12px;
  overflow: hidden;
  aspect-ratio: 16 / 9;
}

.video-wrapper video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-wrapper.local-video {
  border: 3px solid #667eea;
}

.video-label {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(0, 0, 0, 0.7);
  color: white;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
}

.video-controls {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 12px;
}

.connection-status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  background: rgba(255, 255, 255, 0.9);
  border-radius: 24px;
  width: fit-content;
  margin: 0 auto;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #ffc107;
  animation: pulse 2s infinite;
}

.connection-status.connected .status-dot {
  background: #4caf50;
}

.connection-status.error .status-dot {
  background: #f44336;
  animation: none;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.status-text {
  font-size: 14px;
  font-weight: 500;
  color: #333;
}

/* Error Screen */
.error-screen {
  text-align: center;
  color: white;
}

.error-container {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border-radius: 16px;
  padding: 40px;
  max-width: 500px;
  margin: 0 auto;
}

.error-icon {
  font-size: 64px;
  margin-bottom: 20px;
}

.error-container h2 {
  font-size: 24px;
  margin-bottom: 12px;
}

.error-container p {
  margin-bottom: 24px;
  opacity: 0.9;
}

/* Responsive */
@media (max-width: 768px) {
  .video-grid {
    grid-template-columns: 1fr;
  }

  .join-container {
    padding: 24px;
  }

  .logo h1 {
    font-size: 28px;
  }
}