body{margin:0;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background-color:#f4f4f9;color:#333;line-height:1.6}.app-container{max-width:800px;margin:2rem auto;padding:20px;background-color:#fff;border-radius:12px;box-shadow:0 4px 12px #0000001a}.app-title{text-align:center;color:#2c3e50;font-size:2.5rem;margin-bottom:20px;font-weight:700}.app-description{font-size:1.1rem;color:#555;margin-bottom:30px;text-align:center}.app-content{display:flex;flex-direction:column;gap:20px}.input-group{display:flex;flex-direction:column;gap:10px}.input-label{font-size:1rem;color:#2c3e50;font-weight:600}.file-input,.number-input{padding:12px;border:1px solid #ddd;border-radius:8px;font-size:1rem;color:#333;background-color:#f9f9f9;transition:border-color .3s ease,box-shadow .3s ease}.file-input:focus,.number-input:focus{outline:none;border-color:#3498db;box-shadow:0 0 8px #3498db4d}.action-button{padding:12px 20px;background-color:#3498db;color:#fff;border:none;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:background-color .3s ease,transform .2s ease}.action-button:hover{background-color:#2980b9;transform:translateY(-2px)}.action-button:disabled{background-color:#bdc3c7;cursor:not-allowed;transform:none}.print-instruction{margin-top:30px;padding:20px;background-color:#ecf0f1;border-radius:8px;border-left:5px solid #3498db}.print-instruction h3{color:#2c3e50;margin-bottom:10px;font-weight:700}.print-instruction p{font-size:1rem;color:#555;line-height:1.6}.print-instruction strong{color:#e74c3c}.github-button{position:fixed;top:20px;right:20px;padding:12px 20px;background-color:#24292e;color:#fff;border:none;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;display:flex;align-items:center;gap:8px;transition:background-color .3s ease,transform .2s ease}.github-button:hover{background-color:#1a1f24;transform:translateY(-2px)}@media (max-width: 768px){.app-container{padding:15px}.app-title{font-size:2rem}.app-description{font-size:1rem}.file-input,.number-input{padding:10px}.action-button{padding:10px 15px;font-size:.9rem}.print-instruction{padding:15px}.github-button{top:10px;right:10px;padding:8px 16px;font-size:.9rem}.github-button svg{height:16px;width:16px}}@media (max-width: 480px){.app-container{padding:10px}.app-title{font-size:1.8rem}.app-description{font-size:.9rem}.file-input,.number-input{padding:8px;font-size:.9rem}.action-button{padding:8px 12px;font-size:.8rem}.print-instruction{padding:10px}.github-button{position:static;margin:10px auto;font-size:.8rem;padding:8px 12px}.github-button svg{height:14px;width:14px}}