body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f4f7fb;
  color: #1f2937;
}

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

.card {
  width: 100%;
  max-width: 760px;
  background: white;
  border-radius: 16px;
  padding: 30px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

.topbar {
  margin-bottom: 12px;
}

.back-link {
  color: #2563eb;
  text-decoration: none;
  font-size: 14px;
}

h1 {
  margin-top: 0;
  margin-bottom: 10px;
}

.subtitle {
  color: #6b7280;
  margin-bottom: 25px;
}

.actions {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

button {
  padding: 12px 18px;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  font-size: 15px;
}

#startBtn {
  background: #2563eb;
  color: white;
}

#stopBtn {
  background: #dc2626;
  color: white;
}

#clearBtn {
  background: #e5e7eb;
  color: #111827;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.status-box,
.transcript-box {
  background: #f9fafb;
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 16px;
  border: 1px solid #e5e7eb;
}

#transcript {
  white-space: pre-wrap;
  color: #374151;
  max-height: 420px;
  overflow-y: auto;
}