.calc{max-width:860px;margin:0 auto;background:var(--card);border-radius:var(--radius);box-shadow:0 6px 24px rgba(2,8,20,.06);border:1px solid #e5e7eb;overflow:hidden}
    header{padding:18px 22px;border-bottom:1px solid #e5e7eb}
    h1{margin:0;font-size:18px}
    .hint{font-size:12px;color:var(--muted)}
    .content{padding:22px;display:grid;gap:18px}
    .grid{display:grid;gap:14px;grid-template-columns:repeat(12,1fr);align-items:end}
    .col-6{grid-column:span 6}.col-4{grid-column:span 4}.col-3{grid-column:span 3}.col-12{grid-column:span 12}
    label{display:block;font-size:13px;color:var(--muted);margin-bottom:6px}
    input[type="number"]{width:100%;padding:10px 12px;border-radius:10px;border:1px solid #d1d5db;font-size:16px;background:#000;color:var(--ink);transition:border-color .15s,box-shadow .15s;appearance:textfield}
    input[type="number"]:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 4px var(--ring)}
    input::-webkit-outer-spin-button,input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
    .actions{display:flex;gap:12px;align-items:center}
    button{appearance:none;border:0;background:var(--brand);color:#fff;padding:10px 16px;border-radius:10px;font-weight:600;cursor:pointer;box-shadow:0 6px 16px rgba(14,165,233,.25)}
    button:active{transform:translateY(1px)}
    .error{color:var(--warn);font-size:13px}
    .results{display:grid;gap:14px;grid-template-columns:repeat(3,1fr);border-top:1px dashed #e5e7eb;padding-top:16px}
    ._card{grid-column:span 4;border:1px solid #e5e7eb;border-radius:12px;padding:14px}
    ._card h3{margin:0 0 8px;font-size:14px;color:var(--muted);font-weight:600}
    .val{font-size:20px;font-weight:700}
    .small{font-size:12px;color:var(--muted);margin-top:6px}
    .footnote{font-size:12px;color:var(--muted);margin-top:8px}
    @media (max-width: 820px){.col-6,.col-4,.col-12,.card{grid-column:span 12} .actions{flex-direction:column;align-items:stretch} button{width:100%}}