/* Article-only layout and native image/mask controls. No canvas or image model. */
.rust-note{--mask-color:#cd24a0}
.rust-header{padding:52px 0 38px;background:var(--orange-light);border-bottom:2px solid var(--graphite)}
.rust-header h1{font-size:clamp(2.15rem,4.4vw,3.5rem);max-width:1050px}
.rust-header .rust-intro{font-size:1.13rem;max-width:900px;color:var(--muted)}
.rust-meta{display:flex;flex-wrap:wrap;gap:8px 20px;font-size:.84rem;color:var(--muted);margin:22px 0}
.rust-article{padding-block:42px 60px}
.rust-copy{max-width:860px}
.rust-copy h2{font-size:clamp(1.6rem,3vw,2rem);margin:42px 0 18px}
.rust-copy h3{font-size:1.13rem;margin:26px 0 12px}
.rust-copy p,.rust-copy li{color:var(--muted)}
.rust-answer{border-left:4px solid var(--signal);background:var(--wash);padding:22px 26px;margin-bottom:30px}
.rust-answer h2{margin:0 0 12px;font-size:1.3rem}
.rust-answer p{margin:0}
.rust-cover{max-width:1000px;margin:30px 0}
.rust-cover img{display:block;width:100%;height:auto;border:1px solid var(--line);border-radius:0 18px 0 0}
.rust-cover figcaption,.rust-preview-note{font-size:.84rem;color:var(--muted);margin-top:12px}
.rust-toc{display:flex;flex-wrap:wrap;gap:8px 18px;border-block:1px solid var(--line);padding:18px 0;margin:28px 0}
.rust-toc a{font-size:.9rem}
.rust-table-wrap{overflow:auto;border:1px solid var(--line);margin:22px 0}
.rust-table{border-collapse:collapse;width:100%;font-size:.9rem;min-width:560px}
.rust-table th,.rust-table td{padding:13px 16px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.rust-table th{background:var(--orange-light)}
.rust-table tr:last-child td{border-bottom:0}
.rust-method{display:grid;grid-template-columns:1fr 1fr;gap:0 24px;margin:20px 0}
.rust-method div{border-bottom:1px solid var(--line);padding:14px 0}
.rust-method dt{font-size:.82rem;font-family:var(--mono);font-weight:700}
.rust-method dd{margin:6px 0 0;color:var(--muted);font-size:.94rem}
.rust-gallery{margin-top:40px}
.rust-gallery>h2{font-size:2rem;margin-bottom:14px}
.rust-case{margin:28px 0;padding:28px;border:1px solid #b5aa98;border-top:4px solid var(--signal);border-radius:0 16px 0 0;background:#fff}
.rust-case-header{display:flex;align-items:start;justify-content:space-between;gap:16px;margin-bottom:24px}
.rust-case h2{font-size:1.5rem;margin:0}
.rust-verdict{font: .72rem/1.5 var(--mono);padding:6px 10px;border:1px solid #d3c49c;background:var(--orange-light);color:#604a17;max-width:270px}
.rust-pair{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:28px;align-items:start}
.rust-model{min-width:0}
.rust-model h3{font-size:1.07rem;margin:0 0 14px}
.rust-viewer{position:relative;background:#171b1d;overflow:hidden;border:1px solid #b5aa98;isolation:isolate}
.rust-viewer img{display:block;width:100%;height:auto}
.rust-viewer .mask-layer{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;opacity:var(--mask-opacity,.5);pointer-events:none}
.rust-viewer.is-mask-only .rgb-layer{visibility:hidden}
.rust-viewer.is-mask-only .mask-layer{opacity:1;filter:brightness(0) invert(1)}
.rust-viewer.is-mask-only{background:#000}
.rust-controls{display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px;margin-top:12px}
.rust-controls label{flex:1 1 210px;display:flex;align-items:center;gap:10px;font-size:.82rem;min-width:0;margin:0}
.rust-controls input{min-width:60px;width:100%;flex:1;accent-color:#8b5000;min-height:44px;cursor:ew-resize}
.rust-controls output{font-variant-numeric:tabular-nums;min-width:4ch;text-align:right}
.rust-controls button{min-height:44px;padding:8px 12px;border:1px solid #918980;background:var(--orange-light);border-radius:0 8px 0 0;font-family:inherit;font-size:.8rem;font-weight:600;line-height:1.4}
.rust-controls button[aria-pressed=true]{background:var(--graphite);color:var(--signal)}
.rust-model .rust-stats{font:.73rem/1.7 var(--mono);color:#625b4c;margin:14px 0}
.rust-model .rust-observation{font-size:.94rem;color:var(--muted)}
.rust-model .rust-image-links{font-size:.8rem;display:flex;flex-wrap:wrap;gap:10px 18px}
.rust-prompt{margin-top:24px;padding-top:18px;border-top:1px solid var(--line)}
.rust-prompt summary{font-size:.9rem;font-weight:650;min-height:32px}
.rust-prompt pre{white-space:pre-wrap;overflow-wrap:anywhere;max-width:100%;padding:18px;background:var(--wash);border:1px solid var(--line);font: .8rem/1.7 var(--mono)}
.rust-legend{display:flex;align-items:center;gap:8px;font-size:.85rem;color:var(--muted);margin:18px 0}
.rust-legend::before{content:"";width:13px;height:13px;background:var(--mask-color);border:1px solid #8f2478;flex-shrink:0}
.rust-next{border-top:3px solid var(--signal);background:var(--wash);padding:24px;margin-top:35px}
.rust-next h2{margin-top:0}
.rust-links{display:flex;flex-wrap:wrap;gap:12px 24px;margin:24px 0}
.rust-faq{border-top:1px solid var(--line);padding-top:8px;margin-top:35px}
@media(max-width:800px){.rust-header{padding-block:34px 28px}.rust-pair{grid-template-columns:1fr;gap:28px}.rust-case{padding:20px}.rust-case-header{flex-direction:column}.rust-model+.rust-model{border-top:1px solid var(--line);padding-top:24px}.rust-method{grid-template-columns:1fr}.rust-article{padding-top:28px}.rust-gallery>h2{font-size:1.65rem}}
@media(max-width:540px){.rust-case{padding:16px}.rust-case h2{font-size:1.25rem}.rust-controls label{flex-basis:100%}.rust-copy h2{font-size:1.6rem}.rust-header .rust-intro{font-size:1rem}.rust-answer,.rust-next{padding:20px}.rust-prompt pre{padding:12px}}
@media print{.rust-controls{display:none}.rust-pair{grid-template-columns:1fr 1fr}.rust-case{break-inside:avoid}.rust-prompt pre{display:block}}