/* Original presentation; local fonts and assets only. */
.scene-frame[data-view=overlay]{height:540px}@media(max-width:560px){.scene-frame[data-view=overlay]{height:480px}}
.layer-controls{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;padding:14px 20px;background:#0d1d29;border-bottom:1px solid #344b58}.layer-controls[hidden]{display:none}.layer-control{display:grid;grid-template-columns:1fr auto;gap:8px;align-items:center}.layer-control>label:not(.sr-only){grid-column:1/-1;display:flex;align-items:center;gap:6px;font-size:11px;color:#d5e2e8}.layer-control input[type=checkbox]{accent-color:#dbb785;margin:0}.layer-control input[type=range]{width:100%;min-width:0;accent-color:#91cbd3}.layer-control output{font-size:9px;min-width:35px;text-align:right;color:#b6cad6}.layer-controls>p{grid-column:1/-1;margin:0;font-size:9px;color:#a0b9c6}.layer-dot{display:inline-block;width:7px;height:7px;border-radius:2px;flex-shrink:0}.heat-dot{background:#fb994e}.phase-dot{background:#43d0c7}.strain-dot{background:#b2d5e7}.overlay-key{display:none;position:absolute;top:22px;left:25px;pointer-events:none}.overlay-eyebrow{font-size:8px;letter-spacing:.14em;color:#9cbac7}.overlay-key h3{font-size:23px;font-weight:400;margin:7px 0 12px}.overlay-key p{font-size:10px;line-height:2;color:#bfd1da}.overlay-key .layer-dot{margin-right:7px}.overlay-key small{display:block;font-size:9px;color:#9cb3bf}.scene-frame[data-view=overlay] .overlay-key{display:block}.scene-frame[data-view=overlay] .system-row{display:none}@media(max-width:800px){.layer-controls{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px 20px}}@media(max-width:560px){.layer-controls{padding:12px;gap:12px 15px}.layer-control>label:not(.sr-only){font-size:10px}.layer-controls>p{font-size:8px;line-height:1.7}.overlay-key{top:16px;left:15px}.overlay-key h3{font-size:18px;margin:5px 0 8px}.overlay-key p{font-size:9px;line-height:1.8}.overlay-key small{font-size:8px;max-width:260px}}
.katana-film{padding:65px 0;border-bottom:1px solid #34404b}.katana-film>div{display:grid;grid-template-columns:1fr 1fr;gap:0 60px;align-items:center}.katana-film .eyebrow{grid-column:1/-1}.katana-film p:not(.eyebrow){color:#b0bac3;font-size:14px}.katana-film video{display:block;width:100%;height:auto;aspect-ratio:16/9;background:#0a141e;border:1px solid #34404b;border-radius:6px;margin-top:20px}@media(max-width:560px){.katana-film{padding:40px 0}.katana-film>div{display:block}}
:root{color-scheme:dark;--ink:#e7ebec;--muted:#b0bac3;--line:#34404b;--accent:#e6b781;--bg:#111b25}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--bg);color:var(--ink);font-family:Arial,Helvetica,sans-serif;font-size:16px;line-height:1.6}a{color:inherit;text-underline-offset:4px}button,input{font:inherit}button{cursor:pointer;background:#1b2935;color:var(--ink);border:1px solid #43505c;padding:8px 13px;border-radius:3px}button:hover{background:#2a3b48}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:4px}button[aria-pressed=true]{border-color:var(--accent);color:var(--accent)}.skip{position:absolute;left:16px;top:-100px;z-index:10;background:#243440;padding:10px}.skip:focus{top:12px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}
.masthead{max-width:1440px;margin:auto;padding:26px 4%;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);font-size:10px;letter-spacing:.13em}.brand{text-decoration:none;font-size:13px;letter-spacing:.14em;font-weight:700}.brand span{font-weight:400;color:var(--muted)}.mast-context{color:var(--muted)}.mast-context i{display:inline-block;width:4px;height:4px;background:var(--accent);margin:0 14px;vertical-align:middle}.status{color:var(--accent);border:1px solid #6b5b47;padding:4px 9px;font-size:9px}
main{max-width:1320px;margin:auto;padding:0 44px}.intro{display:grid;grid-template-columns:1.3fr 1fr;gap:30px;align-items:end;padding:65px 0 46px}.eyebrow{font-size:10px;letter-spacing:.16em;font-weight:700;color:var(--accent);margin:0 0 20px}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(48px,6.5vw,88px);font-weight:400;letter-spacing:-.055em;line-height:1.02;margin-bottom:0}h1 em{font-family:Georgia,serif;color:var(--accent);font-weight:400}h2{font-size:38px;line-height:1.15;font-weight:400;letter-spacing:-.035em;margin-bottom:22px}h3{font-weight:500;line-height:1.3}.intro-copy{max-width:440px;padding-bottom:5px}.intro-copy p{font-size:19px;line-height:1.6}.text-link{font-size:12px;color:var(--accent)}.text-link span{padding-left:15px}
.experience{border:1px solid #394754;border-radius:6px;overflow:hidden;background:#15212c}.scene-toolbar{display:flex;justify-content:space-between;align-items:center;padding:13px 18px;gap:18px;border-bottom:1px solid #34424e}.tag{font-size:9px;letter-spacing:.12em;color:#d7bda1}.camera-actions{display:flex;gap:7px}.camera-actions button{font-size:11px;padding:5px 10px}.scene-frame{position:relative;height:435px;background:radial-gradient(ellipse at 50% 44%,#34434e 0,#202d37 42%,#111c27 100%);overflow:hidden}#stage{position:absolute;inset:0}#stage canvas{display:block;width:100%;height:100%;touch-action:none}.fallback{padding:100px 25px;text-align:center;color:var(--muted)}.scene-caption{position:absolute;top:21px;left:25px;display:flex;flex-direction:column;pointer-events:none}.scene-caption span{font-size:9px;letter-spacing:.14em;color:#aab8c3}.scene-caption strong{font-size:15px;font-weight:400;margin:3px 0}.scene-caption small{font-size:10px;color:#9caab5}.scene-disclaimer{position:absolute;right:20px;bottom:16px;font-size:10px;line-height:1.6;color:#c4c9cc;text-align:right;margin:0;pointer-events:none}.anatomy{position:absolute;inset:0;pointer-events:none}.anatomy button{position:absolute;left:0;top:0;background:#14212bd9;border:1px solid #62717b;padding:5px 10px;min-width:68px;pointer-events:auto;line-height:1.25;transform:translate(-50%,-50%)}.anatomy em{color:#e6bf91;font-family:Georgia,serif;font-size:15px;display:block}.anatomy span{display:block;font-size:9px;color:#c0c9d0}.anatomy-detail{position:absolute;left:25px;bottom:18px;max-width:440px;font-size:11px;color:#c2c9ce;pointer-events:none;line-height:1.5}.story-controls{display:flex;align-items:center;gap:20px;padding:17px 22px;border-top:1px solid var(--line)}#play{min-width:143px;font-size:12px}#progress{flex:1;accent-color:var(--accent);min-width:40px}#stageCount{font-size:11px;letter-spacing:.08em;min-width:54px;color:var(--accent)}.steps{display:grid;grid-template-columns:repeat(5,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.steps button{border:0;border-right:1px solid #35434f;background:transparent;text-align:left;padding:16px 18px;font-size:12px;border-radius:0;line-height:1.4}.steps button:last-child{border-right:0}.steps button span{display:block;color:#9caab4;font-size:10px;letter-spacing:.1em;margin-bottom:6px}.steps button[aria-pressed=true]{background:#293641;box-shadow:inset 0 -2px var(--accent);color:#f2c594}.story-content{padding:30px;display:grid;grid-template-columns:1.1fr 1fr;gap:50px;min-height:280px}.story-content h2{font-size:30px;margin-bottom:15px}.story-content p{color:#c6cdd1;font-size:14px;line-height:1.75}.story-content .eyebrow{font-size:9px;color:var(--accent);line-height:1.4}.story-content aside{border-left:1px solid #40505d;padding-left:30px}.story-content aside small{font-size:8px;letter-spacing:.12em;color:#adb9c2;display:block}.story-content aside strong{font-size:14px;font-weight:400;display:block;color:#e9be8e;margin:3px 0 12px}.story-content aside p{font-size:12px;margin-bottom:0}.source-line{margin:0;padding:17px 30px;border-top:1px solid var(--line);font-size:10px;color:#b3bec7;line-height:1.7}.source-line a{color:#e4bd90}
.strain-section{display:grid;grid-template-columns:1fr 1.35fr;gap:70px;padding:85px 0;border-bottom:1px solid var(--line)}.section-heading p:not(.eyebrow){color:var(--muted);font-size:15px;max-width:350px}.strain-row{display:flex;align-items:flex-start;gap:20px;padding:20px 0;border-bottom:1px solid var(--line)}.strain-row:first-child{padding-top:0}.strain-row .index{color:#8e9ba5;font-size:10px;padding-top:5px}.strain-row h3{font-size:16px;margin-bottom:6px}.strain-row p{font-size:13px;color:var(--muted);margin:0;max-width:400px}.strain-row .symbol{font-family:Georgia,serif;color:var(--accent);font-size:19px;white-space:nowrap;margin-left:auto}.equation{font-family:Georgia,serif;font-size:23px;color:#e8c29a;line-height:1.6;margin:25px 0 0}.equation small{display:block;color:var(--muted);font:11px/1.6 Arial,sans-serif}.boundary-section{padding:65px 0;border-bottom:1px solid var(--line)}.two-columns{display:grid;grid-template-columns:1fr 1fr;gap:55px}.two-columns p{color:var(--muted);font-size:15px}.reference-section{display:grid;grid-template-columns:1fr 1fr;gap:90px;padding:75px 0;border-bottom:1px solid var(--line)}.reference-section p{font-size:14px;color:var(--muted);max-width:460px}.primary-link{display:inline-flex;background:var(--accent);color:#1b242b;text-decoration:none;font-size:12px;padding:13px 18px;gap:35px;margin-top:12px}.reference-list article{border-bottom:1px solid var(--line);padding:0 0 20px;margin-bottom:20px}.reference-list article>span{color:var(--accent);font-size:10px;letter-spacing:.1em}.reference-list h3{font-size:18px;margin:8px 0}.reference-list article p{font-size:13px;margin:0}.reference-list .reference-limit{font-size:11px;line-height:1.7}.next-section{display:grid;grid-template-columns:1.15fr 1fr;gap:80px;padding:70px 0;border-bottom:1px solid var(--line)}.next-section p{font-size:14px;color:var(--muted)}.admission{padding-top:8px}.admission>div{border-bottom:1px solid var(--line);padding-bottom:9px;margin-bottom:20px}.state{font-size:9px;letter-spacing:.12em}.available{color:#a2c8be}.held{color:#e6b781}.admission .muted{font-size:12px;line-height:1.8}.evidence{margin:40px 0 50px;border-top:0;border-bottom:1px solid var(--line)}.evidence summary{cursor:pointer;font-size:14px;padding:18px 0;list-style:none}.evidence summary span{float:right;color:var(--accent)}.evidence>div{max-width:900px;padding:10px 0 30px;font-size:13px;color:var(--muted)}.evidence a{color:#e1bd97}.evidence ul{padding-left:18px;line-height:2}footer{max-width:1320px;margin:auto;padding:20px 44px 35px;display:flex;justify-content:space-between;gap:20px;font-size:8px;letter-spacing:.1em;color:#9daab4}footer a{font-size:10px;letter-spacing:0}.noscript{padding:20px;background:#30404e}
@media(max-width:800px){main{padding:0 24px}.masthead{padding:20px 24px}.mast-context{display:none}.intro{padding:45px 0 32px;gap:24px}.intro-copy p{font-size:15px}.scene-frame{height:390px}.scene-toolbar{align-items:flex-start;gap:12px}.tag{font-size:8px;max-width:140px}.camera-actions{flex-wrap:wrap;justify-content:flex-end}.camera-actions button{font-size:10px}.story-content{gap:24px;padding:24px}.story-content aside{padding-left:24px}.steps button{padding:12px 10px;font-size:10px}.strain-section,.reference-section,.next-section{gap:40px}.strain-section{grid-template-columns:1fr 1.2fr}.strain-row{gap:12px}.strain-row .symbol{font-size:16px}.two-columns{gap:30px}.anatomy-detail{max-width:280px;font-size:10px}.scene-disclaimer{font-size:9px}.equation{font-size:21px}h2{font-size:32px}footer{padding:20px 24px 30px}footer span:last-child{display:none}}
@media(max-width:560px){main{padding:0 16px}.masthead{padding:18px 16px}.brand{font-size:11px}.status{font-size:7px;letter-spacing:.05em}.intro{grid-template-columns:1fr;gap:25px}.intro h1{font-size:62px}.intro-copy p{font-size:16px;margin-bottom:15px}.eyebrow{font-size:8px}.scene-toolbar{padding:12px;flex-direction:column;gap:8px}.tag{max-width:none;font-size:8px}.camera-actions{justify-content:flex-start;width:100%}.camera-actions button{flex:1}.scene-frame{height:375px}.scene-caption{left:15px;top:15px}.scene-caption strong{font-size:13px}.anatomy button{padding:4px 6px;min-width:52px}.anatomy em{font-size:12px}.anatomy span{font-size:8px}.anatomy-detail{left:15px;bottom:53px;max-width:270px}.scene-disclaimer{left:15px;right:auto;text-align:left;bottom:12px}.story-controls{padding:13px 12px;gap:10px}#play{min-width:115px;padding:7px 9px;font-size:10px}#stageCount{font-size:9px;min-width:43px}.steps button{padding:12px 6px;font-size:9px}.steps button span{font-size:8px}.story-content{grid-template-columns:1fr;gap:22px;padding:23px 18px;min-height:0}.story-content h2{font-size:28px}.story-content aside{border-left:0;border-top:1px solid var(--line);padding:20px 0 0}.source-line{padding:15px 18px}.strain-section,.reference-section,.next-section{grid-template-columns:1fr;gap:30px;padding:48px 0}.strain-row .symbol{font-size:18px}.boundary-section{padding:48px 0}.two-columns{grid-template-columns:1fr;gap:0}.section-heading p:not(.eyebrow){max-width:none}.strain-row p{font-size:12px}.strain-row h3{font-size:15px}.reference-list{margin-top:15px}.equation{font-size:21px}.evidence{margin:25px 0 30px}.evidence ul{line-height:1.8}footer{padding:15px 16px 30px;align-items:flex-start}footer span{max-width:150px;text-align:right;font-size:7px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
.intro{padding-top:44px;padding-bottom:32px}.intro-copy .intro-scope{font-size:12px;color:var(--muted);line-height:1.7;max-width:420px}.scene-frame{height:690px;background:radial-gradient(ellipse at 50% 50%,#1f3544,#0b1722 72%)}.system-switch{display:flex;gap:8px;padding:12px 18px;border-bottom:1px solid var(--line)}.system-switch button{font-size:11px;padding:7px 12px}.sync-strip{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 22px;background:#101d28;border-bottom:1px solid var(--line)}.sync-strip>span{font-size:8px;letter-spacing:.13em;color:#a2cdd0;white-space:nowrap}.sync-strip i{display:inline-block;width:5px;height:5px;border-radius:50%;background:#75d6d9;margin-right:7px}.sync-strip strong{font-size:12px;font-weight:400;color:var(--accent)}.sync-strip small{font-size:9px;color:var(--muted)}.system-row{position:absolute;left:0;width:100%;height:33.333%;pointer-events:none;border-bottom:1px solid #34505f77;padding:16px 22px}.system-row[data-lane=heat]{top:0}.system-row[data-lane=phase]{top:33.333%}.system-row[data-lane=strain]{top:66.666%;border:0}.system-row>div{display:grid;grid-template-columns:25px auto;align-items:baseline;column-gap:10px}.system-number{grid-row:1/3;font-size:10px;color:#6d919e;letter-spacing:.08em}.system-row h3{font-size:15px;line-height:1.2;margin:0 0 5px;letter-spacing:.01em}.system-row small{font-size:9px;color:#98afbd}.field-key{position:absolute;right:22px;top:12px;width:200px;font-size:8px;line-height:1.7;color:#b8cbd4;margin:0}.field-key b{float:right;font-weight:400}.gradient{height:4px;display:block;width:100%;margin-bottom:5px;border-radius:3px}.heat-gradient{background:linear-gradient(90deg,#20588f,#21bdcf,#faa63b,#ff3b1f)}.strain-gradient{background:linear-gradient(90deg,#316ec2,#aec9d9,#ffa855)}.phase-key{display:flex;gap:13px;position:absolute;right:22px;top:12px;margin:0;font-size:9px;color:#b8cbd4}.phase-key span:before{content:'';display:inline-block;width:6px;height:6px;border-radius:2px;margin-right:5px}.austenite-key:before{background:#f5a347}.martensite-key:before{background:#36d4cf}.pearlite-key:before{background:#9c7ae3}.graphic-note{font-size:10px;line-height:1.7;color:#aabfc8;padding:13px 22px;margin:0;background:#0e1b26;border-top:1px solid #344b58}.scene-frame:not([data-view=all]) .system-row{top:0;height:100%;border:0}.scene-frame[data-view=heat] .system-row:not([data-lane=heat]),.scene-frame[data-view=phase] .system-row:not([data-lane=phase]),.scene-frame[data-view=strain] .system-row:not([data-lane=strain]){display:none}.scene-frame:not([data-view=all]) .system-row h3{font-size:22px}.scene-frame:not([data-view=all]) .system-row{padding-top:25px}.anatomy-detail{background:#0e1c27dc;padding:6px 10px;bottom:8px}
@media(max-width:800px){.scene-frame{height:600px}.system-row{padding:14px 16px}.field-key{width:155px;right:16px}.phase-key{right:16px;gap:7px;font-size:8px}.system-row h3{font-size:13px}.system-row small{font-size:8px}.sync-strip{padding:12px 16px}.sync-strip small{display:none}}
@media(max-width:560px){.intro{padding-top:28px}.intro h1{font-size:58px}.scene-frame{height:555px}.scene-toolbar{flex-direction:row;align-items:center}.scene-toolbar .tag{max-width:160px;font-size:7px;line-height:1.6}.camera-actions{width:auto}.camera-actions button{padding:6px;font-size:9px;flex:none}#side{display:none}.system-switch{gap:5px;padding:10px;display:grid;grid-template-columns:1fr 1fr}.system-switch button{font-size:10px;padding:7px 5px}.sync-strip{gap:6px;padding:10px 12px;flex-wrap:wrap}.sync-strip>span{font-size:7px}.sync-strip strong{font-size:10px}.system-row{padding:12px}.system-row>div{grid-template-columns:16px auto;column-gap:5px}.system-number{font-size:8px}.system-row h3{font-size:12px}.system-row small{font-size:8px;max-width:200px}.field-key{top:auto;bottom:11px;left:33px;right:12px;width:auto;font-size:7px}.phase-key{top:auto;bottom:12px;left:33px;right:auto;font-size:8px;gap:12px}.gradient{height:3px}.graphic-note{font-size:9px;padding:12px}.scene-frame:not([data-view=all]) .system-row h3{font-size:18px}.scene-frame:not([data-view=all]) .field-key{bottom:25px;left:22px;right:22px}.scene-frame:not([data-view=all]) .phase-key{bottom:25px;left:22px}}