body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #f4f4f4;
  margin: 0;
  padding: 0;
}

.container {
  max-width: 1100px;
  margin: 32px auto;
  background: #ffffff;
  padding: 24px 32px 32px;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

h1 {
  margin-top: 0;
  margin-bottom: 16px;
}

h2 {
  margin-top: 24px;
  margin-bottom: 12px;
}

p {
  margin-top: 0;
  margin-bottom: 16px;
  color: #444;
}

.viewer-section {
  margin-bottom: 24px;
}

.pdf-frame-wrapper {
  border: 1px solid #ddd;
  border-radius: 8px;
  overflow: hidden;
  background: #f9f9f9;
  height: 80vh;
  max-height: 800px;
}

.pdf-frame {
  width: 100%;
  height: 100%;
  border: none;
}

.send-section {
  margin-top: 32px;
}

.form-row {
  display: flex;
  flex-direction: column;
  margin-bottom: 12px;
}

.form-row label {
  font-size: 0.9rem;
  margin-bottom: 4px;
}

.form-row input[type="file"],
.form-row input[type="email"] {
  padding: 6px 8px;
  border-radius: 6px;
  border: 1px solid #ccc;
  font-size: 0.95rem;
}

button[type="submit"] {
  margin-top: 16px;
  padding: 10px 18px;
  border-radius: 999px;
  border: none;
  font-size: 1rem;
  cursor: pointer;
}

button[type="submit"]:hover {
  opacity: 0.9;
}

.hint {
  font-size: 0.85rem;
  color: #666;
  margin-top: 4px;
}