.a452-body{background:#f5f6f8;color:#18202a}.a452-page{padding-top:18px;padding-bottom:56px}.a452-hero{display:flex;justify-content:space-between;gap:24px;align-items:end;margin:14px 0 18px}.a452-hero h1{font-size:clamp(2rem,4vw,3.7rem);line-height:1;margin:.2rem 0 .55rem}.a452-hero p{max-width:760px;margin:0;color:#5d6672;font-size:1.03rem}.a452-trust{display:grid;grid-template-columns:repeat(3,minmax(96px,1fr));gap:8px;min-width:340px}.a452-trust div{background:#fff;border:1px solid #e4e7eb;border-radius:14px;padding:10px 12px}.a452-trust strong,.a452-trust span{display:block}.a452-trust span{font-size:.76rem;color:#69727d;margin-top:2px}.a452-calculator{padding:18px}.a452-head,.a452-sectionhead{display:flex;align-items:start;justify-content:space-between;gap:16px}.a452-head h2,.a452-sectionhead h2{margin:.2rem 0 0}.a452-topactions{display:flex;gap:8px}.a452-shapes{display:flex;gap:7px;overflow:auto;padding:14px 0 10px;scrollbar-width:thin}.a452-shapes button{white-space:nowrap;border:1px solid #d9dee5;background:#fff;border-radius:999px;padding:8px 12px;font-weight:700}.a452-shapes button.is-active{background:#18202a;color:#fff;border-color:#18202a}.a452-shell{display:grid;grid-template-columns:minmax(0,1.18fr) minmax(320px,.82fr);gap:16px}.a452-inputside,.a452-visualside{border:1px solid #e0e4e8;border-radius:18px;background:#fff;padding:16px}.a452-selectrow{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:10px;margin-bottom:14px}.a452-selectrow label,.a452-field label{font-size:.76rem;font-weight:800;color:#56616d;letter-spacing:.02em}.a452-selectrow select,.a452-field input,.a452-field select{width:100%;border:1px solid #ccd3da;border-radius:10px;background:#fff;padding:10px 11px;font:inherit;color:#18202a}.a452-selectrow label{display:grid;gap:6px}.a452-fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.a452-field{display:grid;gap:6px}.a452-fieldbox{display:grid;grid-template-columns:minmax(0,1fr) 92px;gap:7px}.a452-fieldbox.angle{grid-template-columns:minmax(0,1fr) 82px}.a452-fieldbox.area{grid-template-columns:minmax(0,1fr) 110px}.a452-actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:14px}.a452-actions .primary{background:#18202a;color:#fff;border-color:#18202a}.a452-actions span{font-size:.8rem;color:#69727d;margin-left:auto}.a452-error{margin-top:10px;background:#fff0f0;color:#9b2424;border:1px solid #ffd2d2;border-radius:10px;padding:10px}.a452-visualside{display:grid;grid-template-rows:190px auto;gap:12px;background:linear-gradient(180deg,#fbfcfd,#f4f6f8)}.a452-diagram{display:grid;place-items:center}.a452-diagram svg{width:100%;height:100%;max-width:300px}.a452-diagram .shape{fill:#eaf3ff;stroke:#2c68a0;stroke-width:3}.a452-diagram .cut{fill:#fff;stroke:#2c68a0;stroke-width:3}.a452-diagram text{font-size:13px;fill:#384654;font-weight:700}.a452-result{border-top:1px solid #dde2e7;padding-top:12px}.a452-result>strong{display:block;font-size:clamp(2rem,4vw,3.2rem);letter-spacing:-.04em;margin:4px 0 6px;overflow-wrap:anywhere}.a452-formula{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;color:#3c566d}.a452-derived{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:7px;margin-top:12px}.a452-derived div{background:#fff;border:1px solid #e1e5e9;border-radius:10px;padding:8px 9px}.a452-derived small,.a452-derived strong{display:block}.a452-derived small{color:#737d88;font-size:.68rem;text-transform:uppercase}.a452-derived strong{margin-top:2px;font-size:.9rem}.a452-conversions{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:12px}.a452-conversions div{border:1px solid #e0e4e8;background:#fff;border-radius:12px;padding:9px 10px}.a452-conversions span,.a452-conversions strong{display:block}.a452-conversions span{font-size:.65rem;color:#727c87;font-weight:800}.a452-conversions strong{margin-top:3px;font-size:.9rem}.a452-composite{margin-top:12px;border-top:1px solid #e2e6ea;padding-top:14px;display:grid;grid-template-columns:minmax(230px,.65fr) auto minmax(220px,1fr);gap:12px;align-items:center}.a452-composite>div:first-child strong{font-size:1.45rem;display:block}.a452-composite>div:first-child small{color:#68727d}.a452-composite-actions{display:flex;gap:6px;flex-wrap:wrap}.a452-composite-list{display:flex;gap:6px;overflow:auto}.a452-chip{white-space:nowrap;background:#fff;border:1px solid #dce1e6;border-radius:999px;padding:7px 9px;font-size:.77rem}.a452-chip.minus{color:#9b2424}.a452-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:12px}.a452-grid .panel{padding:15px}.a452-grid h2{font-size:1.08rem;margin:.25rem 0 .45rem}.a452-grid p{margin:0;color:#626d78;font-size:.88rem;line-height:1.55}.a452-history,.a452-reference,.a452-details{margin-top:12px;padding:16px}.a452-history-list{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:12px}.a452-history-row{border:1px solid #dfe4e8;background:#fff;border-radius:12px;padding:10px;text-align:left}.a452-history-row strong,.a452-history-row span{display:block}.a452-history-row span{font-size:.75rem;color:#6b7580;margin-top:3px}.a452-refgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:14px}.a452-refgrid h3{margin:0 0 6px}.a452-refgrid p{margin:0;color:#596570;line-height:1.7}.a452-details summary{cursor:pointer;font-weight:800}.a452-details>div{max-width:860px}.a452-toast{position:fixed;left:50%;bottom:22px;transform:translateX(-50%) translateY(12px);opacity:0;pointer-events:none;background:#18202a;color:#fff;padding:9px 13px;border-radius:999px;font-size:.82rem;transition:.18s}.a452-toast.show{opacity:1;transform:translateX(-50%) translateY(0)}button{cursor:pointer}.a452-body button{border:1px solid #cfd5dc;border-radius:10px;background:#fff;padding:9px 11px;font-weight:750;color:#26313c}.muted{color:#6b7580}
@media(max-width:900px){.a452-hero{align-items:start}.a452-trust{display:none}.a452-shell{grid-template-columns:1fr}.a452-visualside{grid-template-columns:180px 1fr;grid-template-rows:auto;align-items:center}.a452-diagram{height:170px}.a452-grid{grid-template-columns:repeat(2,1fr)}.a452-history-list{grid-template-columns:repeat(2,1fr)}.a452-refgrid{grid-template-columns:repeat(2,1fr)}.a452-composite{grid-template-columns:1fr auto}.a452-composite-list{grid-column:1/-1}}
@media(max-width:600px){.a452-page{padding-top:8px}.a452-hero{margin:7px 0 9px}.a452-hero h1{font-size:2rem;margin:.1rem 0 .3rem}.a452-hero p{font-size:.88rem;line-height:1.4}.a452-calculator{padding:11px}.a452-head h2{font-size:1.05rem}.a452-head .eyebrow{display:none}.a452-topactions{gap:5px}.a452-topactions button{padding:7px 8px;font-size:.72rem}.a452-shapes{padding:9px 0 8px}.a452-shapes button{padding:7px 10px;font-size:.76rem}.a452-inputside,.a452-visualside{padding:11px;border-radius:14px}.a452-selectrow{grid-template-columns:1fr 1fr}.a452-selectrow label:last-child{grid-column:1/-1}.a452-fields{grid-template-columns:1fr}.a452-actions span{width:100%;margin-left:0}.a452-visualside{grid-template-columns:125px 1fr;gap:8px}.a452-diagram{height:125px}.a452-result>strong{font-size:1.7rem}.a452-derived{grid-template-columns:1fr 1fr}.a452-conversions{grid-template-columns:repeat(2,1fr)}.a452-composite{grid-template-columns:1fr}.a452-composite-list{grid-column:auto}.a452-grid,.a452-history-list,.a452-refgrid{grid-template-columns:1fr}.a452-history,.a452-reference,.a452-details{padding:12px}.a452-sectionhead h2{font-size:1.05rem}}
/* V0.452 mobile containment: keep long select labels/history/composite chips inside the calculator grid. */
.a452-shell,.a452-shell>*,.a452-inputside,.a452-visualside,.a452-selectrow,.a452-selectrow label,.a452-selectrow select,.a452-fields,.a452-field,.a452-fieldbox,.a452-fieldbox input,.a452-fieldbox select,.a452-composite,.a452-composite>*,.a452-composite-list{min-width:0;max-width:100%}.a452-composite-list{overflow-x:auto}.a452-chip{max-width:260px;overflow:hidden;text-overflow:ellipsis}.a452-shapes{min-width:0;max-width:100%}
.a452-page,.a452-page *,.a452-page *::before,.a452-page *::after{box-sizing:border-box}.a452-calculator,.a452-shell{min-width:0;max-width:100%}
.a452-result,.a452-formula,.a452-derived,.a452-derived div,.a452-derived strong{min-width:0;max-width:100%;overflow-wrap:anywhere;word-break:break-word}
@media(max-width:600px){.a452-visualside{grid-template-columns:minmax(0,125px) minmax(0,1fr)}.a452-result{overflow:hidden}.a452-derived strong{font-size:.82rem}}
@media(min-width:601px){.a452-shapes{flex-wrap:wrap;overflow:visible}}
@media(max-width:600px){.a452-shapes{flex-wrap:nowrap;overflow-x:auto}}