body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #f0f4f8;
  color: #333;
  margin: 0;
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

h1 {
  margin-bottom: 30px;
  color: #004080;
  text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.1);
}

#startButton {
  background: #007bff;
  border: none;
  color: white;
  padding: 16px 36px;
  font-size: 1.2rem;
  border-radius: 8px;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 123, 255, 0.4);
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
  margin-bottom: 25px;
}

#startButton:hover {
  background: #0056b3;
  box-shadow: 0 6px 18px rgba(0, 86, 179, 0.6);
}

video {
  width: 100%;
  max-width: 640px;
  border-radius: 12px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
  background: black;
}

#outputCard {
  margin-top: 20px;
  max-width: 640px;
  background: white;
  border-radius: 12px;
  padding: 20px 30px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 48px;
  user-select: all;
}

#outputIcon {
  font-size: 1.5rem;
}

#outputText {
  flex-grow: 1;
  word-break: break-word;
}

#outputText.empty {
  color: #999;
  font-style: italic;
}

/* スマホ対応 */
@media (max-width: 700px) {
  #startButton {
    width: 90%;
    font-size: 1rem;
    padding: 14px 0;
  }

  video,
  #outputCard {
    max-width: 100%;
  }
}