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.header.is-scrolled{background:rgba(255,255,255,.95);border-color:var(--line);box-shadow:0 4px 20px #18374b08}
.header-inner{width:min(1120px,calc(100% - 64px));height:100%;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:30px;min-width:0}
.header .brand{display:inline-flex;align-items:center;gap:9px;flex-shrink:0;font-size:18px;font-weight:700;letter-spacing:-.5px;color:#183c57;text-decoration:none}
.brand-mark{width:30px;height:30px;color:#217b8c}
.header .top-nav{display:flex;gap:3px;align-items:center;min-width:0;overflow-x:auto;scrollbar-width:none}
.header .top-nav::-webkit-scrollbar{display:none}
.header .top-nav a{display:block;flex-shrink:0;padding:7px 12px;border-radius:8px;font-size:13px;color:#4c6275;white-space:nowrap;text-decoration:none;transition:background .2s,color .2s}
.header .top-nav a:hover,.header .top-nav a[aria-current]{color:#175675;background:#e3eef4}
.section-rail{position:fixed;right:15px;top:50%;transform:translateY(-50%);z-index:25;display:flex;flex-direction:column;align-items:center;gap:3px;padding:8px 4px;border:1px solid #dce7ed;border-radius:22px;background:#ffffffed;box-shadow:0 5px 25px #1d41500a}
.section-rail a{position:relative;width:28px;min-height:29px;display:flex;align-items:center;justify-content:center;border-radius:14px}
.rail-dot{width:6px;height:6px;border-radius:6px;background:#9aaeba;transition:height .2s,background .2s}
.section-rail a[aria-current] .rail-dot{height:21px;background:#20778a}
.section-rail a:hover .rail-dot{background:#20778a}
.rail-label{position:absolute;right:39px;white-space:nowrap;padding:4px 10px;background:#fff;border:1px solid #dce7ed;border-radius:6px;color:#24586c;font-size:12px;font-weight:600;box-shadow:0 4px 12px #193d5010;opacity:0;transform:translateX(4px);pointer-events:none;transition:opacity .15s,transform .15s}
.section-rail a:hover .rail-label,.section-rail a:focus-visible .rail-label{opacity:1;transform:none}
.hero{width:100%;max-width:none;margin:0;padding:126px 0 45px;position:relative;isolation:isolate;background:radial-gradient(ellipse at 15% 4%,#e0edf8 0,transparent 44%),radial-gradient(ellipse at 88% 12%,#e2f1ee 0,transparent 42%),linear-gradient(#f5f9fb 0%,#fff 82%)}
.hero-inner{position:relative}
.hero-eyebrow{display:flex;align-items:center;justify-content:center;gap:9px;color:#44667b;font-size:12px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;margin-bottom:20px}
.hero-eyebrow>span{width:6px;height:6px;border-radius:50%;background:#25858c;box-shadow:0 0 0 4px #25858c12}
.hero h1{max-width:1020px;margin:auto;text-wrap:balance}
.hero .paper-name{font-size:clamp(54px,5.8vw,82px);font-weight:750;line-height:1.05;letter-spacing:-3.5px;margin-bottom:20px;color:#176881;background:linear-gradient(110deg,#244e89 22%,#157b83 75%);background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.hero .paper-title{font-size:clamp(30px,3.1vw,44px);line-height:1.18;letter-spacing:-1.4px;font-weight:700;color:#172f45}
.paper-title-secondary{color:#344f65}
.hero .authors{margin-top:28px;font-size:16px;gap:6px 22px}
.hero .authors a{color:#285b76;text-decoration:none;border-bottom:1px solid transparent}
.hero .authors a:hover{border-bottom-color:currentColor}
.hero .hero-resources{margin:27px 0 40px;gap:10px}
.hero .resource-chip{background:#fff;color:#294f68;border:1px solid #cddde5;border-radius:9px;padding:9px 18px;min-height:43px;font-size:14px;font-weight:550;box-shadow:0 2px 4px #18374b04}
.hero .resource-chip[href]:hover{background:#edf5f8;border-color:#90b6c6}
.hero .resource-chip.active{background:#235c77;border-color:#235c77;color:#fff}
.hero .resource-chip.active:hover{background:#194962}
.hero .resource-chip[aria-disabled=true]{background:#ffffff80;color:#637381;border-color:#d8e2e9;box-shadow:none}
.hero .resource-chip small{color:inherit;font-size:11px;font-weight:400}
.hero .hero-reel{padding-top:30px;border-top:1px solid #d7e4eb;gap:18px}
.hero .reel-media{border-radius:9px;overflow:hidden;box-shadow:0 6px 20px #18374b0a}
.hero .teaser-caption{max-width:740px;margin:20px auto 0;color:#526778;font-size:13px}
@media(max-width:1279px){.section-rail{display:none}}
@media(max-width:900px){.header-inner{gap:18px}.header .top-nav a{font-size:12px;padding:7px 9px}.hero{padding-top:112px}.hero .paper-name{font-size:64px}.hero .paper-title{font-size:34px}}
@media(max-width:640px){html{scroll-padding-top:78px}.header{height:62px}.header-inner{width:calc(100% - 28px);gap:13px}.header .brand{font-size:14px;gap:5px}.brand-mark{width:23px;height:23px}.header .top-nav{gap:2px;padding:3px}.header .top-nav a{display:block;padding:6px 9px;font-size:12px}.hero{padding:101px 0 28px}.hero-eyebrow{font-size:10px;letter-spacing:.1em;margin-bottom:19px}.hero .paper-name{font-size:53px;letter-spacing:-2px;margin-bottom:18px}.hero .paper-title{font-size:28px;letter-spacing:-.75px;line-height:1.22}.hero .paper-title br{display:none}.paper-title-secondary{display:block;margin-top:5px}.hero .authors{font-size:14px;gap:3px 15px;line-height:1.65;margin-top:24px}.hero .hero-resources{margin:24px 0 27px;gap:7px}.hero .resource-chip{font-size:12px;padding:8px 12px;gap:6px;min-height:38px}.hero .resource-chip small{font-size:10px}.hero .hero-reel{padding-top:23px;gap:14px 10px}.hero .teaser-caption{font-size:12px;margin-top:17px}}
@media(prefers-reduced-motion:reduce){.header,.rail-dot,.rail-label{transition:none}}
.contact-line a{text-decoration:underline;text-underline-offset:3px}
.header .top-nav a:first-child,.header .top-nav a:last-child{display:block}

/* A chapter index, with numbered bookmarks instead of a dot rail. */
.header .brand-mark{width:44px;height:44px;display:block;object-fit:contain;border-radius:50%;background:#fff;border:1px solid #d9e5eb;box-shadow:0 2px 6px #18374b0b;flex:none}
.section-rail{right:12px;gap:7px;padding:0;border:0;border-radius:0;background:transparent;box-shadow:none}
.rail-heading{font-size:9px;line-height:1;letter-spacing:.13em;color:#526778;font-weight:650;margin-bottom:8px}
.section-rail a{width:40px;height:36px;min-height:36px;border-radius:7px;text-decoration:none}
.rail-number{display:flex;align-items:center;justify-content:center;width:32px;height:32px;border:1px solid #dbe5ea;background:#ffffffed;border-radius:6px;font-size:11px;line-height:1;font-weight:600;font-variant-numeric:tabular-nums;color:#536d7d;transition:background .2s,color .2s,transform .2s,border-color .2s}
.section-rail a[aria-current] .rail-number{background:#205b73;border-color:#205b73;color:#fff;box-shadow:0 3px 9px #205b7320;transform:translateX(-4px)}
.section-rail a[aria-current]::after{content:"";position:absolute;width:3px;height:17px;right:-2px;top:10px;background:#269797;border-radius:2px}
.section-rail a:hover .rail-number{background:#edf5f8;border-color:#8cb5c6;color:#205b73;transform:translateX(-4px)}
.section-rail a[aria-current]:hover .rail-number{background:#205b73;color:#fff}
.section-rail .rail-label{right:49px;border-radius:5px;padding:5px 11px;color:#284f65;font-size:12px}
@media(max-width:640px){.header .brand-mark{width:34px;height:34px}.header .brand{gap:6px}.header-inner{gap:10px}}

/* Abstract filmstrip navigation: frames mark progress through the paper. */
.section-rail{right:18px;gap:8px;padding:12px 0;background:transparent}
.section-rail::before{content:"";position:absolute;top:0;bottom:0;left:6px;right:6px;border-left:1px solid #a5c2cb80;border-right:1px solid #a5c2cb80;pointer-events:none}
.section-rail a{width:30px;height:29px;min-height:29px;border-radius:5px}
.rail-frame{position:relative;display:flex;align-items:center;justify-content:center;width:18px;height:13px;border:1px solid #95b1bf;border-radius:3px;background:#ffffffc9;transition:width .22s,height .22s,background .22s,border-color .22s,box-shadow .22s}
.rail-frame::before,.rail-frame::after{content:"";position:absolute;top:4px;width:2px;height:3px;border-radius:1px;background:#7899aa}
.rail-frame::before{left:-6px}.rail-frame::after{right:-6px}
.rail-frame>span{width:5px;height:5px;border-radius:1px;background:#7ea6b4;transform:rotate(45deg);opacity:0;transition:opacity .2s}
.section-rail a[aria-current] .rail-frame{width:25px;height:21px;background:linear-gradient(135deg,#205b83,#198d8b);border-color:#226a80;box-shadow:0 0 0 4px #29899910,0 3px 12px #205b731a}
.section-rail a[aria-current] .rail-frame>span{opacity:1;background:#fff}
.section-rail a[aria-current]::after{content:none}
.section-rail a:hover .rail-frame{border-color:#216d85;background:#e4f2f4;box-shadow:0 0 0 3px #29899910}
.section-rail a[aria-current]:hover .rail-frame{background:linear-gradient(135deg,#205b83,#198d8b)}
.section-rail .rail-label{right:43px}
@media(prefers-reduced-motion:reduce){.rail-frame,.rail-frame>span{transition:none}}
.resource-chip .chip-icon{width:17px;height:17px;font-size:17px;line-height:1;flex:none;margin-right:-3px}
.resource-chip .ai-arxiv{color:#b31b1b}
.resource-chip .chip-emoji{width:auto;display:inline-flex;align-items:center;justify-content:center}