.frc{--color-primary: #2563eb;--color-primary-hover: #1d4ed8;--color-primary-ring: #3b82f6;--color-primary-tint: #eff6ff;--color-surface: #ffffff;--color-surface-muted: #f9fafb;--color-border: #e5e7eb;--color-border-input: #d1d5db;--color-text-heading: #111827;--color-text-body: #374151;--color-text-secondary: #4b5563;--color-text-muted: #6b7280;--gradient-hero: linear-gradient(to right, #eef2ff, #ffffff, #fdf2f8);--radius-input: .5rem;--radius-card: 1rem;--shadow-card: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-raised: 0 10px 15px -3px rgb(0 0 0 / .1);color:var(--color-text-body);background:#fcfcfd;line-height:1.5;-webkit-font-smoothing:antialiased}.frc *{box-sizing:border-box}.frc-container{max-width:72rem;margin-inline:auto;padding-inline:1rem;padding-bottom:1rem}@media (min-width: 640px){.frc-container{padding-inline:1.5rem}}@media (min-width: 1024px){.frc-container{padding-inline:2rem}}.frc .card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-card);box-shadow:var(--shadow-card);padding:1.5rem}.frc .card--raised{box-shadow:var(--shadow-raised)}.frc .btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;background:var(--color-primary);color:#fff;font-weight:600;padding:.625rem 1.5rem;border-radius:var(--radius-input);border:0;cursor:pointer;text-decoration:none;transition:.15s;font-size:1rem}.frc .btn:hover{background:var(--color-primary-hover)}.frc .btn:focus-visible{outline:2px solid var(--color-primary-ring);outline-offset:2px}.frc .btn--full{width:100%;margin-top:1.25rem}.frc .btn--sm{padding:.4rem .85rem;font-size:.85rem}.frc .btn--ghost{background:var(--color-surface);color:var(--color-text-body);border:1px solid var(--color-border-input)}.frc .btn--ghost:hover{background:var(--color-surface-muted)}.frc label.field{display:block;font-size:.875rem;font-weight:600;color:var(--color-text-body);margin-bottom:.35rem}.frc .field--center{text-align:center}.frc .input{width:100%;padding:.6rem .75rem;border:1px solid var(--color-border-input);border-radius:var(--radius-input);background:var(--color-surface);color:var(--color-text-heading);font-size:1rem;font-family:inherit}.frc .input:focus{outline:2px solid var(--color-primary-ring);outline-offset:1px;border-color:var(--color-primary-ring)}.frc .hint{margin:.3rem 0 0;font-size:.78rem;color:var(--color-text-muted)}.frc .hint--block{margin:1rem 0 0}.frc .hint strong{color:var(--color-text-body)}.frc .calc-row{display:flex;align-items:center;justify-content:center;gap:1rem;flex-wrap:wrap}.frc .frac-field{border:1px solid var(--color-border);border-radius:var(--radius-card);padding:1rem;margin:0;display:flex;align-items:center;gap:.6rem;background:var(--color-surface-muted)}.frc .frac-field legend{font-size:.72rem;font-weight:700;letter-spacing:.03em;text-transform:uppercase;color:var(--color-text-muted);padding:0 .35rem}.frc .input--whole{width:4.25rem;text-align:center;font-variant-numeric:tabular-nums}.frc .frac-stack{display:flex;flex-direction:column;gap:.3rem}.frc .input--nd{width:4.25rem;text-align:center;font-variant-numeric:tabular-nums}.frc .frac-bar{height:2px;background:var(--color-text-secondary);border-radius:1px}.frc .op-field{display:flex;flex-direction:column;align-items:center}.frc .input--op{width:auto;min-width:8.5rem;text-align:left;font-weight:600;cursor:pointer}.frc .err{margin:1rem 0 0;padding:.6rem .8rem;font-size:.85rem;line-height:1.4;background:#fffbeb;color:#b45309;border:1px solid #fde68a;border-radius:var(--radius-input)}.frc .btn-row{margin-top:1.25rem;display:flex;gap:.5rem;flex-wrap:wrap}.frc h2.panel{font-size:1.25rem;font-weight:700;color:var(--color-text-heading);margin:0 0 1.25rem}.frc h2.section{font-size:1.5rem;font-weight:700;color:var(--color-text-heading);letter-spacing:-.01em;margin:0}.frc .muted{color:var(--color-text-muted)}.frc .layout{display:grid;grid-template-columns:1fr;gap:1.5rem;margin-top:2rem}@media (min-width: 960px){.frc .layout{grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);align-items:start}.frc .side-card{position:sticky;top:1.5rem}}.frc .empty{text-align:center;padding:2.5rem 1rem}.frc .empty__icon{font-size:2.5rem;margin-bottom:.75rem}.frc .empty p{margin:0;color:var(--color-text-muted);font-size:.95rem;max-width:22rem;margin-inline:auto}.frc .verdict{text-align:center;padding:1.25rem 1rem;margin-bottom:1.25rem;background:var(--color-primary-tint);border:1px solid #bfdbfe;border-radius:var(--radius-card)}.frc .verdict__label{font-size:.72rem;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:var(--color-primary-hover);margin-bottom:.5rem}.frc .verdict__frac{display:inline-flex;flex-direction:column;align-items:center;gap:.2rem;font-variant-numeric:tabular-nums}.frc .vf-num,.frc .vf-den{font-size:1.7rem;font-weight:800;color:var(--color-text-heading);line-height:1.1}.frc .vf-bar{height:3px;align-self:stretch;min-width:3rem;background:var(--color-text-heading);border-radius:2px}.frc .verdict__sub{font-size:1rem;font-weight:700;color:var(--color-primary-hover);margin-top:.5rem}.frc .res-rows{list-style:none;margin:0;padding:0}.frc .res-rows li{display:flex;align-items:baseline;justify-content:space-between;gap:.75rem;font-size:.9rem;padding:.55rem 0;border-top:1px dashed var(--color-border)}.frc .res-rows li:first-child{border-top:0}.frc .res-rows li span{color:var(--color-text-muted)}.frc .res-rows li b{color:var(--color-text-heading);font-weight:700;font-variant-numeric:tabular-nums;word-break:break-all;text-align:right}.frc .working{margin-top:1.25rem;padding-top:1rem;border-top:1px solid var(--color-border)}.frc .working__head{font-size:.95rem;font-weight:700;color:var(--color-text-heading);margin:0 0 .6rem}.frc .working__list{margin:0;padding-left:1.25rem;display:flex;flex-direction:column;gap:.4rem}.frc .working__list li{font-size:.86rem;color:var(--color-text-body);line-height:1.55}.frc .working__list li b{color:var(--color-text-heading);font-weight:700;font-variant-numeric:tabular-nums}.frc .copy-note{text-align:center;font-size:.82rem;color:#047857;margin:.6rem 0 0;font-weight:600}.frc .how{margin-top:3.25rem}.frc .how h2.section{text-align:center}.frc .how__lead{text-align:center;color:var(--color-text-secondary);margin:.4rem auto 1.75rem;max-width:40rem}.frc .steps{display:grid;grid-template-columns:1fr;gap:1.1rem}@media (min-width: 720px){.frc .steps{grid-template-columns:repeat(3,1fr)}}.frc .step{padding:1.5rem 1.25rem}.frc .step__n{width:2.5rem;height:2.5rem;margin:0 0 .9rem;border-radius:999px;display:inline-flex;align-items:center;justify-content:center;font-weight:800;font-size:1.1rem;color:var(--color-primary);background:var(--color-primary-tint);border:1px solid #bfdbfe}.frc .step h3{font-size:1.05rem;font-weight:700;color:var(--color-text-heading);margin:0 0 .4rem}.frc .step p{margin:0;font-size:.9rem;color:var(--color-text-secondary)}.frc .facts{margin-top:1.75rem}.frc .facts>h3{font-size:1.1rem;font-weight:700;color:var(--color-text-heading);margin:0 0 1.1rem}.frc .facts__grid{display:grid;grid-template-columns:1fr;gap:1.5rem}@media (min-width: 640px){.frc .facts__grid{grid-template-columns:1fr 1fr}}.frc .facts__grid h4{font-size:.95rem;font-weight:700;color:var(--color-primary-hover);margin:0 0 .6rem}.frc .formula{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.9rem;color:var(--color-text-heading);margin:0 0 .4rem;background:var(--color-surface-muted);border:1px solid var(--color-border);border-radius:var(--radius-input);padding:.5rem .65rem}.frc .facts__note{font-size:.8rem;color:var(--color-text-secondary);margin:.7rem 0 0}.frc .facts__note strong{color:var(--color-text-heading)}.frc .facts__fine{font-size:.78rem;color:var(--color-text-muted);margin:1.25rem 0 0;padding-top:1rem;border-top:1px solid var(--color-border);line-height:1.5}.frc .privacy-line{margin-top:1.75rem;display:flex;align-items:center;gap:1rem;background:#ecfdf5;border:1px solid #a7f3d0}.frc .privacy-line__icon{font-size:1.5rem;flex:0 0 auto}.frc .privacy-line strong{color:#065f46}.frc .privacy-line p{margin:0;color:#047857;font-size:.95rem}.frc .foot{margin:2.5rem 0 1rem;padding-top:1.25rem;border-top:1px solid var(--color-border);text-align:center}.frc .foot p{margin:0;font-size:.85rem}