body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f5f5f5;
  margin: 0;
  padding: 0;
}

.screen {
  display: none;
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
  background: #ffffff;
  min-height: 100vh;
  box-sizing: border-box;
}

.screen.active {
  display: block;
}

h1, h2 {
  margin-top: 0;
}

p {
  line-height: 1.5;
}

button {
  margin-top: 1.5rem;
  padding: 0.7rem 1.8rem;
  border-radius: 4px;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  background: #007bff;
  color: white;
}

button:hover {
  background: #0056b3;
}

video {
  width: 100%;
  max-height: 450px;
  background: #000;
  margin: 1rem 0;
  border-radius: 16px;
  overflow: hidden;
  display: block;
}

.video-controls {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.progress-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

progress {
  flex: 1;
  height: 8px;
}


.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.question {
  margin-top: 1rem;
}

.likert {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

textarea {
  width: 100%;
  font: inherit;
  padding: 0.5rem;
  box-sizing: border-box;
}