.qf-hero{display:grid;grid-template-columns:1.5fr 1fr;gap:36px;align-items:center;padding:35px 0 22px}.qf-hero h1{font-size:clamp(32px,4.5vw,49px);line-height:1.5;margin:7px 0 12px;letter-spacing:-.5px}.qf-hero h1 em{font-style:normal;color:var(--accent)}.qf-hero p{font-size:14px;line-height:2;color:var(--muted);margin:0}.qf-hero .eyebrow{font-size:11px;color:var(--blue)}.qf-stats{display:flex;gap:10px 22px;flex-wrap:wrap;font-size:12px;color:var(--muted);margin-top:22px}.qf-stats>span{display:flex;align-items:center;gap:6px}.qf-stats b{font-size:20px;color:var(--accent);font-variant-numeric:tabular-nums}.qf-principle{padding:20px;border-inline-start:2px solid #5f9e87;border-radius:12px;background:linear-gradient(120deg,#173b3288,#142a4000)}.qf-principle strong{font-size:15px;color:var(--accent)}.qf-principle p{font-size:12px;margin-top:10px}.qf-links{display:flex;gap:10px 20px;flex-wrap:wrap;margin:12px 0 24px}.qf-links a{font-size:12px;color:var(--blue);text-underline-offset:4px}.qf-spotlight{position:relative;padding:22px 25px;border:1px solid #457a6b;border-radius:14px;margin:24px 0;background:linear-gradient(120deg,#16362d,#12273c)}.qf-spotlight .eyebrow{font-size:10px;color:var(--accent);margin:0 0 10px}.qf-spotlight h2{font-size:23px;margin:0 0 9px}.qf-spotlight>p:not(.eyebrow){font-size:13px;line-height:2;max-width:930px;color:#cbd9e6;margin:0}.qf-spotlight>div{display:flex;gap:9px;flex-wrap:wrap;margin-top:16px}.qf-spotlight .button{font-size:12px;min-height:44px}.qf-controls{padding:22px;border:1px solid var(--line);background:var(--panel);border-radius:13px;margin:25px 0}.qf-controls>label{font-size:13px;font-weight:700;display:block;margin-bottom:9px}.qf-search-row{display:flex;gap:10px}.qf-search-row input{flex:1;min-width:0;font:inherit;font-size:13px;color:var(--text);background:#0b192a;border:1px solid #39576e;border-radius:8px;padding:12px 14px;min-height:46px}.qf-search-row .button{font-size:11px}.qf-filter-row{display:flex;align-items:end;gap:12px;flex-wrap:wrap;margin-top:14px}.qf-scopes{display:flex;gap:6px;flex-wrap:wrap}.qf-scopes button,.qf-controls select{font:inherit;font-size:12px;color:var(--muted);background:#13283b;border:1px solid #345068;border-radius:8px;padding:9px 13px;min-height:44px}.qf-scopes b{font-size:11px;color:var(--blue);margin-inline-start:6px}.qf-scopes [aria-pressed=true],#savedOnly[aria-pressed=true]{color:var(--accent);border-color:var(--accent);background:#18392f}.qf-topic-label{display:flex;flex-direction:column;gap:5px;font-size:10px;color:var(--muted);flex:1;min-width:180px;max-width:340px}.qf-topic-label select{width:100%;max-width:100%;color:var(--text);font-size:11px}#savedOnly{font-size:11px;min-height:44px;gap:7px}.qf-results-row{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:13px}.qf-results-row p{font-size:12px;color:var(--muted);margin:0}.qf-results-row button{font:inherit;font-size:11px;color:var(--blue);background:none;border:0;min-height:44px;cursor:pointer;text-decoration:underline;text-underline-offset:4px}.qf-save-hint{font-size:10px;color:var(--muted);margin:5px 0 0;line-height:1.9}#saveNotice{font-size:11px;color:#f0ce8f}.qf-empty,.qf-nojs{font-size:13px;line-height:2;background:#13263a;border:1px solid var(--line);padding:18px;border-radius:10px}.qf-section{margin:28px 0;scroll-margin-top:95px}.qf-section-heading{display:flex;align-items:center;gap:12px;margin-bottom:15px}.qf-section-heading h2{font-size:22px;margin:0}.qf-section-heading>span{font-size:12px;border:1px solid #355465;border-radius:6px;padding:3px 8px;color:var(--accent)}.qf-grid{display:grid;grid-template-columns:1fr 1fr;gap:13px;align-items:start}.qf-card{border:1px solid #30485d;background:linear-gradient(130deg,#13273b,#101e31);border-radius:11px;min-width:0;scroll-margin-top:90px}.qf-card summary{cursor:pointer;list-style:none;position:relative;padding:18px 20px}.qf-card summary::-webkit-details-marker{display:none}.qf-card summary::marker{content:''}.qf-card-meta{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:12px}.qf-card-meta>b{font-size:10px;color:var(--blue);direction:ltr;letter-spacing:1px;font-variant-numeric:tabular-nums}.qf-kind{font-size:9px;color:#aac0d5;border:1px solid #385169;background:#112135;border-radius:5px;padding:3px 6px}.qf-kind-reference{color:#f0ce8f;border-color:#796747;background:#342b1d}.qf-kind-calculation{color:#a5dcff;border-color:#3f6883}.qf-card h3{font-size:16px;line-height:1.8;color:var(--text);margin:0 0 8px}.qf-takeaway{font-size:12px;color:#c4d4e4;line-height:2;margin:0;overflow-wrap:anywhere}.qf-more{font-size:10px;color:var(--accent);display:block;margin-top:13px}.qf-card[open]{border-color:#538874;background:linear-gradient(130deg,#142e38,#101e31)}.qf-card[open] .qf-more{color:var(--muted)}.qf-card-body{padding:0 20px 19px;border-top:1px solid #2f465b}.qf-card-body h4{color:var(--accent);font-size:12px;margin:15px 0 6px}.qf-card-body>p{font-size:12px;line-height:2;margin:0;color:var(--muted);overflow-wrap:anywhere}.qf-card-body .qf-context{border-inline-start:2px solid #9a8153;color:#e4d2ad;padding-inline-start:12px;margin-top:12px;font-size:11px}.qf-card-links{display:flex;flex-wrap:wrap;gap:8px 15px;margin-top:15px}.qf-card-links a{font-size:11px;color:var(--blue);text-underline-offset:4px;min-height:35px;display:inline-flex;align-items:center}.qf-card-links .qf-source{font-size:10px;color:var(--muted)}.qf-save{font:inherit;font-size:11px;min-height:44px;border:1px solid #42624f;border-radius:7px;padding:8px 11px;background:#18362d;color:var(--accent);margin-top:8px;cursor:pointer}.qf-save[aria-pressed=true]{background:#254a39;border-color:var(--accent)}.qf-permalink{font-size:10px;color:var(--blue);display:inline-flex;margin-inline-start:14px;min-height:44px;align-items:center}.qf-load-row{text-align:center;margin:20px 0 35px}#factMore{min-width:210px;min-height:46px;font-size:12px}.qf-tools{border-top:1px solid var(--line);padding-top:25px;margin:28px 0;scroll-margin-top:85px}.qf-tools>h2{font-size:23px;margin:0 0 8px}.qf-tools>p{font-size:12px;color:var(--muted);line-height:2}.qf-tools-grid{display:grid;grid-template-columns:.85fr 1.5fr;gap:16px;margin-top:20px}.qf-tools-grid>section{border:1px solid var(--line);border-radius:11px;padding:20px;background:var(--panel);min-width:0}.qf-tools h3{font-size:16px;margin:0 0 15px}.qf-tools label{display:block;font-size:11px;color:var(--muted);line-height:1.8}.qf-tools input{display:block;width:100%;min-width:0;direction:ltr;text-align:start;min-height:44px;font:inherit;font-size:14px;color:var(--text);background:#0b192a;border:1px solid #39576e;border-radius:7px;margin-top:6px;padding:9px 10px}.qf-input-grid{display:grid;grid-template-columns:1fr 1fr;gap:13px}.qf-tools .button{font-size:11px;min-height:44px;margin-top:13px}.qf-math-result{font-size:14px!important;line-height:2;color:var(--accent);min-height:45px;padding:12px;background:#132f2b;border-radius:8px}.qf-math-result[data-valid=false]{font-size:11px!important;color:var(--muted);background:#13263a}.qf-tool-note{font-size:10px!important;line-height:1.9;color:var(--muted);margin-bottom:0}.qf-sources{margin:30px 0;border:1px solid var(--line);border-radius:11px;padding:0 20px}.qf-sources summary{font-size:14px;cursor:pointer;padding:17px 0;color:var(--accent)}.qf-sources p{font-size:12px;color:var(--muted);line-height:2}.qf-sources ul{columns:2;padding-inline-start:20px}.qf-sources li{font-size:11px;line-height:2.2;break-inside:avoid;margin-bottom:7px}.qf-sources a{color:var(--blue);text-underline-offset:4px}.qf-reviewed{font-size:10px;color:var(--muted)}.quick-facts :focus-visible{outline:3px solid var(--accent);outline-offset:3px}.qf-formula{direction:ltr;unicode-bidi:isolate;text-align:left;font:11px/1.9 ui-monospace,monospace!important;color:#b7d9ee!important;background:#102135;border:1px solid #35516a;border-radius:6px;padding:10px;margin-top:12px!important;overflow-wrap:anywhere}
@media(max-width:760px){.qf-hero{grid-template-columns:1fr;gap:17px;padding-top:25px}.qf-hero h1{font-size:34px}.qf-hero p{font-size:12px}.qf-principle{padding:15px 18px}.qf-principle strong{font-size:13px}.qf-stats{gap:12px 18px;font-size:11px}.qf-stats b{font-size:18px}.qf-controls{padding:15px}.qf-search-row{gap:7px}.qf-search-row input{font-size:12px;padding-inline:10px}.qf-search-row .button{padding:7px 10px;font-size:10px}.qf-filter-row{gap:9px}.qf-scopes{width:100%}.qf-scopes button{flex:1;font-size:11px;padding-inline:9px}.qf-topic-label{min-width:145px;flex:1;max-width:none}.qf-spotlight{padding:18px}.qf-spotlight h2{font-size:20px}.qf-spotlight>p:not(.eyebrow){font-size:12px}.qf-grid{grid-template-columns:1fr}.qf-card summary{padding:16px 17px}.qf-card h3{font-size:16px}.qf-card-body{padding-inline:17px}.qf-tools-grid{grid-template-columns:1fr}.qf-tools-grid>section{padding:17px}.qf-sources{padding-inline:15px}.qf-sources ul{columns:1}.qf-links{gap:10px 15px}.qf-links a{font-size:11px}.qf-section-heading h2{font-size:21px}}
@media(max-width:360px){.qf-hero h1{font-size:31px}.qf-stats{gap:8px 15px}.qf-search-row{flex-wrap:wrap}.qf-search-row input{flex-basis:100%}.qf-search-row .button{min-height:40px}.qf-input-grid{grid-template-columns:1fr}.qf-kind{font-size:8px}.qf-card-meta{gap:7px}.qf-results-row{align-items:start}.qf-results-row p{font-size:11px;padding-top:10px}}
@media print{.qf-controls,.qf-spotlight,.qf-links,.qf-save,.qf-permalink,.qf-load-row,.qf-more,.qf-tools button{display:none!important}.qf-hero{display:block;padding:10px 0}.qf-principle{margin-top:12px}.qf-grid,.qf-tools-grid{display:block}.qf-card{break-inside:avoid;margin:10px 0;background:white;color:#111;border-color:#aaa}.qf-card::details-content,.qf-sources::details-content{display:block!important;content-visibility:visible!important}.qf-card-body{display:block!important}.qf-card h3,.qf-card p,.qf-card h4,.qf-card a,.qf-kind{color:#111!important}.qf-takeaway,.qf-card-body>p{font-size:10px!important}.qf-card-links a{min-height:0;font-size:9px}.qf-sources ul{columns:2}.qf-section-heading h2{color:#111}.qf-tools-grid>section{break-inside:avoid}.qf-hero h1{font-size:28px}}

.qf-grade-guide{border:1px solid #3f625c;background:linear-gradient(120deg,#132c30,#111e31);padding:23px;border-radius:14px;margin:0 0 23px;min-width:0}.qf-grade-guide h2{font-size:20px;line-height:1.8;margin:3px 0 8px}.qf-grade-guide>p{color:var(--muted);font-size:12px}.qf-grade-guide .eyebrow{color:var(--accent);font-size:11px}.qf-range-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:19px 0}.qf-working-range{display:flex;flex-direction:column;align-items:start;padding:15px;border:1px solid #3e665f;border-radius:10px;background:#102337;min-width:0}.qf-working-range>span{font-size:13px;font-weight:700}.qf-working-range strong{font-size:31px;color:var(--accent);line-height:1.8}.qf-working-range small{font-size:10px;line-height:1.95;color:var(--muted)}.qf-working-range:hover{border-color:var(--accent)}.qf-range-basis{font-size:11px!important}.qf-grade-spec{border-top:1px solid #35514f;padding-top:13px;font-size:11px;line-height:2}.qf-grade-spec>summary{cursor:pointer;min-height:35px;color:var(--blue)}.qf-practical{background:#132c32;border:1px solid #31554f;border-radius:9px;padding:13px;margin:0 0 16px}.qf-practical h4{margin:0 0 5px!important;color:var(--accent)}.qf-practical p{margin:0;font-size:12px;line-height:2}.qf-comparison-note{border-inline-start:2px solid var(--amber);padding-inline-start:10px;color:var(--amber)!important;font-size:11px!important}.qf-kind-working{color:var(--accent);background:#193a35}
@media(max-width:620px){.qf-grade-guide{padding:16px}.qf-grade-guide h2{font-size:17px}.qf-range-grid{grid-template-columns:1fr;gap:9px}.qf-working-range{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:0 12px;align-items:center}.qf-working-range small{grid-column:1/-1}.qf-working-range strong{font-size:27px}.qf-working-range>span{font-size:12px}}
@media print{.qf-grade-guide,.qf-working-range,.qf-practical{background:#fff;color:#111;border-color:#999;break-inside:avoid}.qf-grade-guide :is(p,strong,small,summary),.qf-practical :is(h4,p){color:#111!important}}