body { font-family: Arial, sans-serif; background: #f9f9f9; margin: 0; padding: 0; }
.container { max-width: 900px; margin: 40px auto; background: #fff; box-shadow: 0 2px 8px rgba(0,0,0,0.1); padding: 24px; border-radius: 8px; }
h1 { text-align: center; margin-bottom: 24px; }
#pdf-viewer { width: 100%; min-height: 80vh; background: #f9f9f9; display: flex; justify-content: center; align-items: center; }
canvas { box-shadow: 0 2px 8px rgba(0,0,0,0.1); border-radius: 8px; }
.download-btn { display: block; margin: 24px auto 0 auto; padding: 12px 32px; background: #0078d4; color: #fff; border: none; border-radius: 4px; font-size: 1.1em; cursor: pointer; text-decoration: none; transition: background 0.2s; }
.download-btn:hover { background: #005fa3; }