.page-wrapper{display:flex;flex-direction:column;min-height:100vh}
.form-label{display:block;margin-bottom:6px;font-weight:600}
.form-control,.form-select{width:100%;padding:10px 12px;border:1px solid #ced4da;border-radius:8px;background:#fff;font-size:16px}
.form-select{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%23666' d='M6 8L0 0h12z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 10px center;background-size:12px 8px}
.btn{display:inline-block;padding:10px 16px;border-radius:8px;border:1px solid transparent;cursor:pointer;font-weight:600;transition:background .2s,color .2s,border-color .2s}
.btn-primary{background:#6366f1;border-color:#6366f1;color:#fff}
.btn-primary:hover{background:#4f46e5;border-color:#4f46e5}
.btn-outline-secondary{background:#fff;border-color:#6c757d;color:#6c757d}
.btn-outline-secondary:hover{background:#6c757d;color:#fff}
.mb-3{margin-bottom:1rem}
.mt-4{margin-top:1.5rem}
.mt-auto{margin-top:auto}
.text-muted{color:#6c757d}
.text-danger{color:#dc3545}
.result-area-wrapper code,.formula-display code{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace}