.math-page{--math-accent: #1f6f8b;--math-ink: #172435;--math-paper: #fffdf8;--math-wash: #f3f6f5;--math-rule: color-mix(in srgb, var(--math-accent) 22%, #d8d6cf);color:var(--math-ink)}.math-hero{display:grid;grid-template-columns:minmax(0,1fr);padding-block:clamp(54px,8vw,104px) 44px;border-bottom:1px solid var(--math-rule)}.math-kicker,.math-section-kicker{display:inline-block;color:var(--math-accent);font:800 11px/1.2 var(--mono);letter-spacing:.13em;text-transform:uppercase}.math-hero h1{max-width:13ch;margin-top:18px;font-size:clamp(38px,6.2vw,76px);font-weight:880;line-height:1.02;letter-spacing:-.045em}.math-hero h1 em{color:var(--math-accent);font-style:normal}.math-hero-lead{max-width:64ch;margin-top:24px;color:var(--txt-dim);font-size:clamp(16px,1.9vw,20px);line-height:1.85}.math-hero-lead b{color:var(--math-ink)}.math-section{padding-block:clamp(58px,8vw,90px);border-bottom:1px solid var(--math-rule);scroll-margin-top:80px}.math-section-head{display:grid;grid-template-columns:120px minmax(0,760px);gap:28px;align-items:start}.math-section h2{margin-top:4px;font-size:clamp(28px,4vw,44px);letter-spacing:-.025em}.math-lead{max-width:760px;margin:15px 0 0 148px;color:var(--txt-dim);font-size:17px;line-height:1.85}.math-lead b{color:var(--math-ink)}.math-prose{max-width:880px;margin:34px auto 0}.math-prose h3{margin:34px 0 10px;font-size:23px}.math-prose p{margin-top:13px;color:var(--txt-dim);font-size:15.5px;line-height:1.9}.math-prose p b{color:var(--math-ink)}.math-prose code,.math-equation code{padding:2px 6px;border-radius:5px;background:color-mix(in srgb,var(--math-accent) 9%,#fff);color:var(--math-accent);font-family:var(--mono)}.math-equation{max-width:880px;margin:28px auto 0;padding:24px clamp(18px,4vw,36px);border-block:1px solid var(--math-rule);background:color-mix(in srgb,var(--math-accent) 4%,var(--math-paper))}.math-equation .formula{margin:0;padding:0;border:0;background:transparent;text-align:center}.math-equation p{margin-top:11px;color:var(--txt-dim);text-align:center;font-size:13px}.math-manual{max-width:880px;margin:30px auto 0;border-top:2px solid var(--math-ink);border-bottom:1px solid var(--math-rule)}.math-manual-row{display:grid;grid-template-columns:150px minmax(0,1fr);gap:24px;padding:18px 0;border-top:1px solid var(--math-rule)}.math-manual-row:first-child{border-top:0}.math-manual-row dt{color:var(--math-accent);font:800 12px/1.5 var(--mono)}.math-manual-row dd{color:var(--txt-dim);font-size:14.5px;line-height:1.8}.math-manual-row dd b{color:var(--math-ink)}.math-handcalc{max-width:880px;margin:34px auto 0;padding:clamp(22px,4vw,36px);border:1px solid var(--math-rule);background:var(--math-paper);box-shadow:0 24px 55px -48px #172435b3}.math-handcalc header{display:flex;justify-content:space-between;gap:20px;align-items:baseline;padding-bottom:14px;border-bottom:2px solid var(--math-ink)}.math-handcalc h3{font-size:20px}.math-handcalc header span{color:var(--math-accent);font:800 11px var(--mono)}.math-handcalc ol{counter-reset:calc;list-style:none;margin-top:10px}.math-handcalc li{counter-increment:calc;display:grid;grid-template-columns:34px minmax(0,1fr);gap:12px;padding:13px 0;border-top:1px dashed var(--math-rule);color:var(--txt-dim);font-size:14px;line-height:1.75}.math-handcalc li:first-child{border-top:0}.math-handcalc li:before{content:counter(calc);display:grid;place-items:center;width:26px;height:26px;border-radius:50%;background:var(--math-accent);color:#fff;font:800 11px var(--mono)}.math-handcalc b{color:var(--math-ink)}.math-plain{max-width:880px;margin:26px auto 0;padding:19px 22px;border-left:3px solid var(--math-accent);background:color-mix(in srgb,var(--math-accent) 5%,#fff);color:var(--txt-dim);font-size:14.5px;line-height:1.85}.math-plain strong{display:block;margin-bottom:4px;color:var(--math-accent);font-size:13px}.math-plain b{color:var(--math-ink)}.math-model-links{max-width:880px;margin:30px auto 0;border-top:2px solid var(--math-ink)}.math-model-link{display:grid;grid-template-columns:135px minmax(0,1fr) auto;gap:22px;align-items:baseline;padding:19px 0;border-bottom:1px solid var(--math-rule)}.math-model-link strong{color:var(--math-accent);font:850 13px var(--mono)}.math-model-link p{color:var(--txt-dim);font-size:14px}.math-model-link a{min-height:44px;display:inline-flex;align-items:center;color:var(--math-accent);font-weight:800;font-size:12px}.math-model-link a:hover{text-decoration:underline;text-underline-offset:4px}.math-myths{max-width:880px;margin:28px auto 0}.math-myth{display:grid;grid-template-columns:minmax(180px,.8fr) minmax(0,1.2fr);gap:28px;padding:22px 0;border-top:1px solid var(--math-rule)}.math-myth:first-child{border-top:2px solid var(--math-ink)}.math-myth h3{color:#a04445;font-size:16px}.math-myth p{color:var(--txt-dim);font-size:14px}.math-myth p b{color:var(--math-ink)}.math-recall{max-width:880px;margin:30px auto 0;counter-reset:recall}.math-recall details{border-top:1px solid var(--math-rule)}.math-recall details:first-child{border-top:2px solid var(--math-ink)}.math-recall summary{position:relative;min-height:54px;display:flex;align-items:center;padding:12px 42px;cursor:pointer;color:var(--math-ink);font-weight:750;list-style:none}.math-recall summary::-webkit-details-marker{display:none}.math-recall summary:before{counter-increment:recall;content:"Q" counter(recall);position:absolute;left:0;color:var(--math-accent);font:800 12px var(--mono)}.math-recall summary:after{content:"+";position:absolute;right:6px;color:var(--math-accent);font:800 22px var(--mono)}.math-recall details[open] summary:after{content:"−"}.math-recall details p{padding:0 42px 18px;color:var(--txt-dim);font-size:14px;line-height:1.8}.math-sources{max-width:880px;margin:28px auto 0;list-style:none;counter-reset:src}.math-sources li{counter-increment:src;display:grid;grid-template-columns:38px minmax(0,1fr);gap:12px;padding:15px 0;border-top:1px solid var(--math-rule);color:var(--txt-dim);font-size:13px}.math-sources li:first-child{border-top:2px solid var(--math-ink)}.math-sources li:before{content:counter(src,decimal-leading-zero);color:var(--math-accent);font:800 11px var(--mono)}.math-sources a{color:var(--math-ink);font-weight:750}.math-sources a:hover{color:var(--math-accent);text-decoration:underline;text-underline-offset:3px}.math-source-note{max-width:880px;margin:18px auto 0;color:var(--txt-faint);font-size:12px}.math-next{display:grid;grid-template-columns:1fr 1fr;max-width:880px;margin:38px auto 0;border-block:1px solid var(--math-rule)}.math-next a{min-height:90px;display:flex;flex-direction:column;justify-content:center;padding:18px}.math-next a+a{border-left:1px solid var(--math-rule);text-align:right}.math-next small{color:var(--txt-faint);font:700 10px var(--mono)}.math-next b{margin-top:4px;color:var(--math-accent)}.math-page .topic-diagram{max-width:1060px;margin-inline:auto;border-color:var(--math-rule);border-radius:0;background:var(--math-paper);box-shadow:none}.math-page .topic-diagram__pan{background:var(--math-paper)}@media(max-width:760px){.math-section-head{grid-template-columns:1fr;gap:8px}.math-lead{margin-left:0}.math-manual-row,.math-model-link{grid-template-columns:1fr;gap:5px}.math-model-link a{justify-content:flex-start}.math-myth{grid-template-columns:1fr;gap:6px}}@media(max-width:520px){.math-hero{padding-top:42px}.math-hero h1{font-size:42px}.math-handcalc{padding:20px 16px}.math-handcalc header{display:block}.math-handcalc header span{display:block;margin-top:4px}.math-next{grid-template-columns:1fr}.math-next a+a{border-left:0;border-top:1px solid var(--math-rule);text-align:left}}@media(prefers-reduced-motion:reduce){.math-page *,.math-page *:before,.math-page *:after{scroll-behavior:auto!important;transition-duration:.01ms!important}}