.calc-tool{margin:8px 0 24px;color:var(--ink)}
.calc-tabs{display:flex;flex-wrap:wrap;gap:6px;margin:0 0 -1px;position:relative;z-index:1}
.calc-tabs button{border:1px solid var(--line);border-bottom-color:transparent;background:var(--soft);color:var(--muted);font:inherit;font-weight:700;padding:11px 20px;border-radius:12px 12px 0 0;cursor:pointer}
.calc-tabs button[aria-selected=true]{background:var(--white);color:var(--accent);border-color:var(--line);border-bottom-color:var(--white)}
.calc-tabs button:focus-visible{outline:3px solid var(--accent);outline-offset:-3px}
.calc-panel{background:var(--white);border:1px solid var(--line);border-radius:0 18px 18px 18px;padding:clamp(16px,3vw,30px);box-shadow:0 10px 30px #102d3c0c}
.calc-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(220px,320px);gap:24px;align-items:start}
.calc-display{background:var(--soft);border:1px solid var(--line);border-radius:14px;padding:14px 16px;margin:0 0 14px}
.calc-input{width:100%;box-sizing:border-box;border:1px solid var(--field-border);border-radius:10px;background:var(--white);color:var(--ink);font:500 1.35rem/1.4 ui-monospace,"DejaVu Sans Mono",monospace;padding:10px 12px}
.calc-input:focus{outline:3px solid var(--accent-soft);border-color:var(--accent)}
.calc-input[aria-invalid]{border-color:#c2410c}
.calc-result{display:block;text-align:right;font:700 clamp(1.5rem,4vw,2.3rem)/1.25 ui-monospace,"DejaVu Sans Mono",monospace;margin-top:10px;min-height:1.25em;overflow-wrap:anywhere;font-variant-numeric:tabular-nums}
.calc-result.is-error{color:#c2410c;font-family:inherit;font-size:1rem;font-weight:600;line-height:1.45;text-align:left}
.calc-status.is-error{color:#c2410c;font-weight:600}
.calc-status{margin:8px 0 0;min-height:1.4em;color:var(--muted);font-size:.92rem}
.calc-status.is-warning{color:#b45309}
:root[data-theme=dark] .calc-result.is-error,:root[data-theme=dark] .calc-status.is-error{color:#fb923c}
:root[data-theme=dark] .calc-status.is-warning{color:#fbbf24}
:root[data-theme=dark] .calc-input[aria-invalid]{border-color:#fb923c}
.calc-options{display:flex;flex-wrap:wrap;align-items:center;gap:12px 20px;margin:0 0 14px}
.calc-hint{color:var(--muted);font-size:.85rem}
.calc-hint kbd,.calc-hint code,.calc-help code,.calc-learn code{font-family:ui-monospace,"DejaVu Sans Mono",monospace;font-size:.9em;background:var(--soft);border:1px solid var(--line);border-radius:5px;padding:0 4px}
.calc-segment{display:inline-flex;border:1px solid var(--field-border);border-radius:10px;overflow:hidden}
.calc-segment label{position:relative;padding:8px 14px;cursor:pointer;font-weight:700;font-size:.92rem}
.calc-segment label+label{border-left:1px solid var(--field-border)}
.calc-segment input{position:absolute;opacity:0;inset:0;margin:0;cursor:pointer}
.calc-segment label:has(input:checked){background:var(--accent-soft);color:var(--accent)}
.calc-segment label:has(input:focus-visible){outline:3px solid var(--accent);outline-offset:-3px}
.calc-select{display:inline-flex;align-items:center;gap:8px;font-weight:700}
.calc-select select{min-height:40px;border:1px solid var(--field-border);border-radius:8px;background:var(--white);color:var(--ink);padding:6px 10px;font:inherit}
.calc-check{display:inline-flex;align-items:center;gap:8px;font-weight:700;cursor:pointer}
.calc-check input{width:18px;height:18px;accent-color:var(--accent)}
.calc-check small{color:var(--muted);font-weight:400}
.calc-keys{display:grid;gap:8px}
.sci-keys{grid-template-columns:repeat(7,minmax(0,1fr))}
.prog-keys{grid-template-columns:repeat(8,minmax(0,1fr));margin-top:16px}
.calc-keys button{min-height:50px;border:1px solid var(--line);border-radius:10px;background:var(--white);color:var(--ink);font:700 1.1rem/1 inherit;font-family:inherit;cursor:pointer;box-shadow:0 2px 0 var(--line);padding:4px}
.calc-keys button:hover:not(:disabled){border-color:var(--accent)}
.calc-keys button:active:not(:disabled){transform:translateY(1px);box-shadow:none}
.calc-keys button:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
.calc-keys button:disabled{opacity:.35;cursor:not-allowed}
.calc-keys .fn{background:var(--soft);font-size:.95rem}
.calc-keys .op{background:var(--soft);color:var(--accent);font-size:1.2rem}
.calc-keys .act{background:var(--soft);color:#c2410c}
:root[data-theme=dark] .calc-keys .act{color:#fb923c}
.calc-keys .eq{background:var(--accent);color:var(--white);border-color:var(--accent);font-size:1.4rem;grid-column:span 3}
.prog-keys .eq{grid-column:span 3}
.calc-side{background:var(--soft);border:1px solid var(--line);border-radius:14px;padding:16px;min-width:0}
.calc-side-head{display:flex;justify-content:space-between;align-items:baseline;gap:12px}
.calc-side h2,.bit-board h2{font-size:1.05rem;margin:0 0 10px}
.calc-link{border:0;background:none;color:var(--accent);font:inherit;font-weight:700;cursor:pointer;padding:0;text-decoration:underline}
.calc-history{list-style:none;margin:0;padding:0;display:grid;gap:6px;max-height:430px;overflow:auto}
.calc-history-item{display:grid;width:100%;text-align:left;gap:2px;border:1px solid var(--line);border-radius:9px;background:var(--white);color:var(--ink);padding:8px 10px;cursor:pointer;font:inherit}
.calc-history-item:hover{border-color:var(--accent)}
.calc-history-item span{color:var(--muted);font:.85rem/1.3 ui-monospace,"DejaVu Sans Mono",monospace;overflow-wrap:anywhere}
.calc-history-item strong{font:700 1rem/1.3 ui-monospace,"DejaVu Sans Mono",monospace;overflow-wrap:anywhere}
.calc-empty{color:var(--muted);font-size:.9rem;margin:0}
.calc-help{margin-top:20px;border-top:1px solid var(--line);padding-top:14px}
.calc-help summary{cursor:pointer;font-weight:700;color:var(--accent)}
.calc-help dl{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:10px 24px;margin:14px 0 0}
.calc-help dt{font-weight:700}
.calc-help dd{margin:2px 0 0;color:var(--muted);line-height:1.7}
.prog-bases{display:grid;gap:6px}
.prog-base{display:grid;grid-template-columns:70px minmax(0,1fr);align-items:center;gap:12px;border:1px solid var(--line);border-radius:10px;padding:9px 12px;cursor:pointer;position:relative}
.prog-base input{position:absolute;opacity:0;inset:0;margin:0;cursor:pointer}
.prog-base:has(input:checked){border-color:var(--accent);background:var(--accent-soft)}
.prog-base:has(input:focus-visible){outline:3px solid var(--accent);outline-offset:2px}
.prog-base-name{font-weight:800;letter-spacing:.06em;color:var(--muted)}
.prog-base:has(input:checked) .prog-base-name{color:var(--accent)}
.prog-value{font:600 1.1rem/1.4 ui-monospace,"DejaVu Sans Mono",monospace;overflow-wrap:anywhere;font-variant-numeric:tabular-nums}
.bit-board{margin-top:22px;border-top:1px solid var(--line);padding-top:16px}
.bit-board p{margin:0 0 12px}
.bit-grid{display:grid;grid-template-columns:repeat(16,minmax(0,1fr));gap:4px 3px}
.bit-cell{display:grid;gap:2px;text-align:center}
.bit-cell.nibble-end{margin-right:6px}
.bit-cell small{color:var(--muted);font-size:.68rem;min-height:1em;font-variant-numeric:tabular-nums}
.bit-cell button{min-height:36px;border:1px solid var(--line);border-radius:6px;background:var(--white);color:var(--muted);font:700 1rem/1 ui-monospace,"DejaVu Sans Mono",monospace;cursor:pointer;padding:0}
.bit-cell button[aria-pressed=true]{background:var(--accent);color:var(--white);border-color:var(--accent)}
.bit-cell button.sign{box-shadow:inset 0 -3px 0 #c2410c}
.bit-cell button:focus-visible{outline:3px solid var(--accent);outline-offset:1px}
.fp-bits{display:flex;flex-wrap:wrap;gap:3px;margin:6px 0 10px}
.fp-bit{width:26px;height:34px;border:1px solid transparent;border-radius:5px;font:700 .95rem/1 ui-monospace,"DejaVu Sans Mono",monospace;cursor:pointer;padding:0}
.fp-bit.sign,.fp-key.sign{background:#fde2e1;color:#9f1239}
.fp-bit.exp,.fp-key.exp{background:#dcfce7;color:#166534}
.fp-bit.frac,.fp-key.frac{background:#dbeafe;color:#1e40af}
:root[data-theme=dark] .fp-bit.sign,:root[data-theme=dark] .fp-key.sign{background:#4c1d24;color:#fecdd3}
:root[data-theme=dark] .fp-bit.exp,:root[data-theme=dark] .fp-key.exp{background:#14361f;color:#bbf7d0}
:root[data-theme=dark] .fp-bit.frac,:root[data-theme=dark] .fp-key.frac{background:#172a4d;color:#bfdbfe}
.fp-bit[aria-pressed=true]{border-color:currentColor;box-shadow:inset 0 0 0 1px currentColor}
.fp-bit:focus-visible{outline:3px solid var(--accent);outline-offset:1px}
.fp-legend{display:flex;flex-wrap:wrap;gap:8px 12px;align-items:center;margin:0 0 18px}
.fp-key{border-radius:6px;padding:4px 9px;font-weight:700;font-size:.85rem}
.fp-facts{display:grid;gap:0;margin:0;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.fp-facts div{display:grid;grid-template-columns:minmax(130px,200px) minmax(0,1fr);gap:16px;padding:10px 14px;border-top:1px solid var(--line)}
.fp-facts div:first-child{border-top:0}
.fp-facts dt{font-weight:700}
.fp-facts dd{margin:0;font-family:ui-monospace,"DejaVu Sans Mono",monospace;overflow-wrap:anywhere;color:var(--ink)}
.fp-facts .fp-exact{max-height:9em;overflow:auto}
.fp-formula{margin:16px 0 0;font:600 1.1rem/1.6 ui-monospace,"DejaVu Sans Mono",monospace;overflow-wrap:anywhere}
.calc-learn{background:var(--white);border:1px solid var(--line);border-radius:18px;padding:clamp(18px,3vw,34px);box-shadow:0 10px 30px #102d3c0c}
.calc-learn .eyebrow{color:var(--accent);margin:0 0 10px}
.calc-learn h2{font-size:clamp(1.4rem,2.4vw,2rem);line-height:1.2;margin:0 0 16px}
.calc-learn-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px}
.calc-learn-grid div{background:var(--soft);border-left:4px solid var(--accent);border-radius:9px;padding:16px}
.calc-learn h3{font-size:1.05rem;margin:0 0 6px}
.calc-learn p{color:var(--muted);line-height:1.65;margin:0}
@media (max-width:860px){.calc-layout{grid-template-columns:1fr}.bit-grid{grid-template-columns:repeat(8,minmax(0,1fr))}.bit-cell:nth-child(8n) {margin-right:0}}
@media (max-width:520px){.sci-keys{gap:5px}.calc-keys button{min-height:44px;font-size:.95rem}.calc-keys .fn{font-size:.8rem}.calc-tabs{flex-wrap:nowrap;gap:4px}.calc-tabs button{flex:1 1 0;padding:9px 4px;font-size:.84rem}.prog-keys{gap:4px}.prog-keys button{min-height:42px;font-size:.78rem;padding:2px}.prog-keys .fn{font-size:.68rem}.fp-facts div{grid-template-columns:1fr;gap:4px}.fp-bit{width:22px;height:30px}}