.calc-hero{background:var(--hero);border-bottom:1px solid var(--line);padding:42px 0 62px}.calc-back{display:inline-block;color:var(--muted);font-size:16px;font-weight:650;margin-bottom:52px}.calc-back:hover{color:var(--accent)}.calc-kicker{color:var(--accent);font-size:14px;font-weight:750;letter-spacing:.1em}.calc-hero h1{font-size:clamp(45px,5.6vw,78px);line-height:1.06;margin:20px 0 22px}.calc-hero h1 em{color:var(--accent);font-family:Georgia,serif;font-weight:400}.calc-lede{max-width:690px;color:var(--muted);font-size:19px;line-height:1.65}.calc-highlights{display:flex;flex-wrap:wrap;gap:12px 30px;margin-top:32px;color:var(--muted);font-size:13px;font-weight:700;letter-spacing:.06em}.calc-workspace{padding-top:64px;padding-bottom:90px}.calc-intro{display:grid;grid-template-columns:1fr 1fr;gap:35px;align-items:end}.calc-intro h2{font-size:clamp(32px,3.5vw,48px);margin-top:12px}.calc-intro>p{color:var(--muted);font-size:17px;max-width:550px}.presets{display:flex;flex-wrap:wrap;gap:10px;margin:32px 0}.presets button{min-height:44px;font-size:15px;font-weight:650;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:4px;padding:9px 14px;cursor:pointer}.presets button:hover{border-color:var(--accent)}.presets button[aria-pressed="true"]{background:var(--ink);color:var(--bg);border-color:var(--ink)}.grid{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:24px;align-items:start}.inputs{display:grid;gap:18px}fieldset{min-width:0;border:1px solid var(--line);background:var(--surface);padding:20px 24px 24px;margin:0;display:grid;gap:14px}legend{font-size:16px;font-weight:750;letter-spacing:.01em;padding:0 8px;color:var(--ink)}.row{display:grid;grid-template-columns:repeat(auto-fit,minmax(145px,1fr));gap:14px}label{display:grid;gap:6px;font-size:15px;color:var(--ink);line-height:1.4}input,select{min-height:46px;font:inherit;font-size:16px;color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:3px;padding:8px 10px;width:100%;min-width:0}input:focus-visible,select:focus-visible{outline:3px solid var(--accent);outline-offset:2px}.toggle{display:flex;gap:10px;align-items:center;font-size:16px;font-weight:650}.toggle input{width:20px;min-height:20px;height:20px;accent-color:var(--accent)}[hidden]{display:none!important}.out{position:sticky;top:16px;min-width:0;background:var(--surface2);border:1px solid var(--line);padding:28px;display:grid;gap:24px}.out h2{font-size:16px;letter-spacing:0;line-height:1.35;margin:0;color:var(--ink)}.big{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;margin:12px 0 5px}.big .n{font-size:clamp(48px,5vw,66px);font-weight:700;letter-spacing:-.04em;line-height:1;font-variant-numeric:tabular-nums;color:var(--accent)}.big .u{color:var(--muted);font-size:17px}.kv{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:10px 18px;font-size:15px}.kv span:nth-child(even){font-variant-numeric:tabular-nums;text-align:right;font-weight:650}.bar{display:flex;height:12px;overflow:hidden;background:var(--line);border-radius:3px}.bar i{display:block;height:100%}.tiers{display:grid;gap:9px;font-size:14px}.tiers div{display:grid;grid-template-columns:12px minmax(0,1fr) auto auto;gap:8px;align-items:center;font-variant-numeric:tabular-nums}.tiers div span:nth-child(3),.tiers div span:nth-child(4){text-align:right}.dot{width:10px;height:10px;border-radius:2px}.note{font-size:15px;color:var(--muted);margin:0;line-height:1.55}.warn,.calc-error{color:#9a3a31}.calc-error{font-weight:650}.out[data-invalid=true]>*:not(.calc-error){display:none}.out svg{display:block;min-width:280px;max-width:100%}svg text{fill:var(--muted);font-size:11px}.method{border-top:1px solid var(--line);margin-top:65px;padding-top:32px;max-width:900px}.method h2{font-size:30px;margin:0 0 18px}.method p{font-size:16px;color:var(--muted);line-height:1.7;margin:0 0 16px}.method strong{color:var(--ink)}:root{--t1:var(--accent);--t2:#a37717;--t3:#a65861}html[data-theme=dark]{--t2:#d7b66c;--t3:#e4a4a0}html[data-theme=dark] .warn,html[data-theme=dark] .calc-error{color:#ffb3a7}@media(prefers-color-scheme:dark){html:not([data-theme]){--t2:#d7b66c;--t3:#e4a4a0}html:not([data-theme]) .warn,html:not([data-theme]) .calc-error{color:#ffb3a7}}@media(max-width:850px){.grid,.calc-intro{grid-template-columns:1fr}.out{position:static}.calc-intro{gap:14px}.calc-hero{padding-bottom:48px}.calc-back{margin-bottom:38px}.calc-workspace{padding-top:48px}}@media(max-width:480px){.calc-hero h1{font-size:43px}.calc-workspace{padding-bottom:65px}.out{padding:22px}.row{grid-template-columns:1fr;gap:10px}fieldset{padding:16px}.tiers{font-size:13px}.calc-highlights{font-size:12px}}

/* Decode model: native MathML keeps the equations crisp without extra scripts. */
.calc-hero-grid{display:grid;grid-template-columns:minmax(0,1.12fr) minmax(0,.88fr);gap:clamp(32px,5vw,72px);align-items:center}.calc-hero-copy{min-width:0}.formula-card{min-width:0;border:1px solid var(--line);background:var(--surface);padding:clamp(22px,2.5vw,34px);box-shadow:0 18px 45px #09252a0a}.formula-heading{display:flex;justify-content:space-between;gap:16px;color:var(--accent);font-size:12px;letter-spacing:.09em;font-weight:750}.formula-heading span:last-child{color:var(--muted)}.formula-main{overflow-x:auto;padding:28px 0 12px;color:var(--ink);font-size:clamp(19px,1.8vw,25px)}.formula-main math{margin:0;min-width:max-content}.formula-caption{text-align:center;color:var(--muted);font-size:14px}.formula-details{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--line);margin-top:25px}.formula-details>div{overflow-x:auto;padding:18px 10px 16px 0;min-width:0}.formula-details>div:nth-child(3){grid-column:1/-1;border-top:1px solid var(--line)}.formula-details math{margin:0;min-width:max-content;font-size:17px}.formula-link{display:inline-flex;gap:14px;color:var(--accent);font-size:15px;font-weight:700;margin-top:8px}.formula-link:hover{text-decoration:underline;text-underline-offset:4px}@media(max-width:960px){.calc-hero-grid{grid-template-columns:1fr;gap:30px}.formula-card{max-width:650px;width:100%}}@media(max-width:480px){.formula-card{padding:20px}.formula-main{font-size:19px}.formula-details{grid-template-columns:1fr}.formula-details>div:nth-child(2),.formula-details>div:nth-child(3){grid-column:auto;border-top:1px solid var(--line)}.formula-details>div{padding:15px 0}.formula-heading span:last-child{display:none}}

.formula-details>div:first-child{grid-column:1/-1}.formula-details>div:nth-child(2),.formula-details>div:nth-child(3){grid-column:auto;border-top:1px solid var(--line)}@media(max-width:480px){.formula-details>div:first-child{grid-column:auto}}