:root{--bg:#080f20;--ink:#edf5ff;--muted:#a5b5cf;--line:#263854;--lime:#245d98}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--bg);color:var(--ink);font-family:'DM Sans',Arial,sans-serif;font-size:14px}button,input{font:inherit}a{color:inherit;text-decoration:none}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #68d9ff;outline-offset:5px}.wrap{max-width:1240px;margin:0 auto;padding-left:40px;padding-right:40px}.header{border-bottom:1px solid var(--line)}.nav{height:92px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;font-family:Manrope,Arial,sans-serif;font-weight:800;font-size:24px;letter-spacing:-1.1px}.brand img{margin-right:10px}.brand>span:not(.domain){font-weight:500}.brand .domain{font-size:15px;letter-spacing:-.4px;color:var(--muted);align-self:center;margin:5px 0 0 2px}nav{display:flex;gap:31px;font-size:13px}nav a{padding:35px 0;color:#a8bad5}nav .active{color:var(--ink);border-bottom:2px solid var(--ink)}.reading-button{background:transparent;border:1px solid #35557d;padding:11px 14px;border-radius:5px;color:var(--ink);font-size:12px}.reading-button span{margin-left:12px;font-size:10px;background:#203e67;border-radius:3px;padding:2px 5px}.hero{display:grid;grid-template-columns:1.05fr 1fr;gap:45px;padding-top:64px;padding-bottom:60px;align-items:center}.eyebrow{font-size:10px;font-weight:700;letter-spacing:1.8px;display:flex;align-items:center;gap:9px}.dot{display:inline-block;width:6px;height:6px;border-radius:50%;background:#6ae4ff}.hero h1{font-family:Manrope,Arial,sans-serif;font-size:clamp(42px,4.6vw,62px);font-weight:500;line-height:1.13;letter-spacing:-3px;margin:24px 0}.hero h1 em{font-style:normal;color:#65cfff}.intro{font-size:15px;line-height:1.9;color:var(--muted);margin:0 0 27px}.primary{border:0;display:inline-flex;align-items:center;gap:30px;background:linear-gradient(115deg,#175de1,#1678df);color:#fff;border-radius:4px;padding:15px 20px;font-weight:500;font-size:12px;transition:background .2s,transform .2s}.primary:hover{background:#2465d8;transform:translateY(-2px)}.primary span{font-size:19px}.hero-note{display:flex;align-items:center;gap:9px;font-size:10px;color:var(--muted);margin-top:24px}.tiny-orbit{font-size:18px}.hero-art{height:364px;background:#091831;border-radius:8px;position:relative;overflow:hidden;isolation:isolate}.art-grid{position:absolute;inset:0;background-image:linear-gradient(#72baff12 1px,transparent 1px),linear-gradient(90deg,#72baff12 1px,transparent 1px);background-size:42px 42px;mask-image:radial-gradient(ellipse,#000,transparent)}.hero-art:after{content:'';position:absolute;inset:0;background:radial-gradient(ellipse at 50% 55%,#168fff40,transparent 65%);z-index:-1}.art-label,.art-footer{position:absolute;font-size:8px;letter-spacing:1.7px;color:#c8eaff;left:25px;right:25px;display:flex;align-items:center;gap:8px}.art-label{top:24px}.art-footer{bottom:22px;justify-content:space-between;color:#9dbddc}.planet{position:absolute;width:158px;height:158px;left:50%;top:49%;transform:translate(-50%,-50%);border-radius:50%;background:radial-gradient(circle at 27% 24%,#effdff 0%,#91eaff 22%,#278ff3 45%,#154599 67%,#07142d 80%);box-shadow:-5px -5px 35px #42bbff60,22px 15px 35px #020b20;z-index:2}.planet:after{content:'';position:absolute;inset:0;border-radius:50%;opacity:.25;background:repeating-radial-gradient(ellipse at 20% 40%,transparent 0px,#d6f8ff 1px,transparent 2px,transparent 4px);mix-blend-mode:soft-light}.orbit{position:absolute;left:50%;top:50%;width:340px;height:155px;border:1px solid #79cdff88;border-radius:50%;transform:translate(-50%,-50%) rotate(-32deg)}.orbit-two{transform:translate(-50%,-50%) rotate(39deg);width:300px;height:190px;border-color:#5caaff55}.orbit-three{transform:translate(-50%,-50%) rotate(-67deg);width:290px;height:207px;border-color:#89c9ff44}.satellite{position:absolute;border-radius:50%;background:#d4faff;box-shadow:0 0 15px #58cfffaa;z-index:3}.satellite-one{width:10px;height:10px;top:105px;right:83px}.satellite-two{width:6px;height:6px;bottom:89px;left:99px}.art-cross{position:absolute;top:80px;left:62px;color:#71bdf8;font-size:19px;font-weight:400}.principles{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding-top:21px;padding-bottom:21px;font-size:11px;color:var(--muted)}.principles>span:first-child{font-weight:600;color:var(--ink)}.principles i{font-style:normal;color:#64c9ff;font-size:16px;margin-right:9px}.research{padding-top:56px;padding-bottom:60px}.section-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:20px}.section-heading h2{font-family:Manrope,Arial,sans-serif;font-size:29px;letter-spacing:-1.2px;font-weight:600;margin:13px 0 0}.section-heading h2 span{color:#65d2ff}.section-heading>p{font-size:11px;color:var(--muted);margin:0 0 5px}.filter-bar{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-top:30px;padding-bottom:19px;border-bottom:1px solid var(--line)}.filters{display:flex;gap:8px;flex-wrap:wrap}.filters button{padding:9px 14px;border:1px solid var(--line);border-radius:5px;background:transparent;color:#b4c5df;font-size:11px}.filters button[aria-pressed=true]{background:linear-gradient(115deg,#175de1,#1678df);border-color:#508cff;color:white}.filters button:hover{border-color:#58bdff}.search-toggle{border:1px solid var(--line);border-radius:5px;background:transparent;padding:7px 9px;color:var(--ink)}.feed-status{display:flex;justify-content:space-between;font-size:9px;color:#a4b7d3;padding:19px 0;letter-spacing:.8px}.article-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:23px}.card{border:1px solid var(--line);border-radius:7px;overflow:hidden;background:#101e35;transition:transform .2s,box-shadow .2s}.card:hover{transform:translateY(-4px);box-shadow:0 10px 25px #008cff25}.card-art{height:177px;position:relative;overflow:hidden;display:flex;align-items:center;justify-content:center}.card-art svg{width:100%;height:100%}.card-image-button{border:0;padding:0;width:100%;display:block;background:transparent;cursor:pointer}.art-badge{position:absolute;top:14px;left:14px;padding:5px 8px;border-radius:3px;background:#071a35e8;color:#b9eaff;font-size:8px;font-weight:600;letter-spacing:.4px}.card-body{padding:20px}.card-meta{font-size:9px;color:#9eb3d1;display:flex;gap:8px;align-items:center}.card-category{color:#74d2ff;font-weight:700;text-transform:uppercase;font-size:8px;letter-spacing:1px}.card h3{font-family:Manrope,Arial,sans-serif;font-size:19px;font-weight:650;letter-spacing:-.6px;line-height:1.45;margin:12px 0 9px}.title-button{font:inherit;text-align:left;border:0;background:none;color:inherit;padding:0}.title-button:hover{color:#72d7ff}.card-description{font-size:12px;color:#a8bad3;line-height:1.75;margin:0 0 19px;min-height:63px}.card-footer{padding-top:14px;border-top:1px solid #263854;display:flex;align-items:center;justify-content:space-between}.source{font-size:10px;color:#a8d5ff}.source:hover{text-decoration:underline}.save{border:0;background:transparent;padding:3px;color:#a4bddb;display:flex}.save[aria-pressed=true]{color:#88e3ff}.save[aria-pressed=true] svg{fill:#245d98}.search-panel{display:flex;align-items:center;gap:15px;padding-top:20px}.search-panel[hidden],.empty[hidden]{display:none}.search-panel label{font-size:12px}.search-panel input{flex:1;padding:12px;border:1px solid var(--line);border-radius:4px;min-width:0;background:#101e35}.search-panel button{background:none;border:0;color:var(--ink)}.empty{text-align:center;padding:50px}.approach{border-top:1px solid var(--line);padding-top:47px;padding-bottom:49px;display:grid;grid-template-columns:1fr 1fr;gap:100px}.approach h2{font-family:Manrope,Arial,sans-serif;font-weight:500;font-size:36px;line-height:1.25;letter-spacing:-1.5px;margin:19px 0}.approach>div>p:not(.eyebrow){color:var(--muted);font-size:13px;line-height:1.8;max-width:320px}.approach a{display:inline-flex;gap:30px;font-size:12px;font-weight:600;margin-top:13px}.approach-points article{display:flex;gap:22px;padding:19px 0;border-bottom:1px solid var(--line)}.approach-points article:first-child{padding-top:10px}.approach-points article:last-child{border:0}.approach-points article>span{font-size:11px;color:#69b8ff;padding-top:5px}.approach-points h3{font-size:15px;margin:0 0 8px;font-weight:600}.approach-points p{color:var(--muted);font-size:12px;line-height:1.75;margin:0}.closing{background:#102c51;border-radius:7px;padding:35px;max-width:1160px;display:flex;align-items:center;justify-content:space-between;margin-bottom:58px;gap:20px}.closing .eyebrow{font-size:8px;color:#aedcff}.closing h2{font-family:Manrope,Arial,sans-serif;font-weight:500;font-size:27px;letter-spacing:-.7px;margin:12px 0 0}.closing .primary{font-size:11px}footer{border-top:1px solid var(--line)}.footer-top{padding:32px 0;display:flex;align-items:center;justify-content:space-between}.footer-top .brand{font-size:21px}.footer-top p,.footer-top>a:last-child{font-size:11px;color:var(--muted)}.footer-bottom{border-top:1px solid var(--line);padding:21px 0 28px;display:flex;justify-content:space-between;gap:18px;font-size:9px;color:#9cafc9}.maple{color:#72ccff;margin-left:7px}dialog{border:1px solid var(--line);border-radius:12px;padding:45px;width:min(680px,calc(100% - 30px));max-height:85vh;color:var(--ink);background:var(--bg)}dialog::backdrop{background:#020918dd;backdrop-filter:blur(5px)}.dialog-close{position:absolute;right:16px;top:12px;border:0;background:none;color:var(--ink);font-size:28px}.dialog-title{font-family:Manrope,Arial,sans-serif;font-size:32px;letter-spacing:-1px;line-height:1.25}.dialog-text{color:#b6c7e0;font-size:15px;line-height:1.9}.dialog-source{padding:20px;background:#152e50;border-radius:5px;margin-top:25px;font-size:12px;line-height:1.8}.dialog-source a{text-decoration:underline;overflow-wrap:anywhere}.dialog-save{margin-top:20px}.toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%,20px);padding:13px 22px;background:#174789;color:white;border-radius:6px;font-size:12px;opacity:0;transition:.2s;pointer-events:none;z-index:5}.toast.visible{opacity:1;transform:translate(-50%,0)}.skip{position:fixed;top:-80px;left:20px;z-index:10;background:#152e50;padding:15px}.skip:focus{top:10px}
@media(min-width:1400px){.hero{padding-top:75px;padding-bottom:70px}.hero-art{height:390px}}@media(max-width:1000px){.wrap{padding-left:25px;padding-right:25px}.nav{gap:12px}nav{gap:18px}.hero{gap:24px}.hero h1{font-size:48px}.hero-art{height:340px}.section-heading{display:block}.section-heading>p{margin-top:12px}.article-grid{gap:15px}.card-body{padding:16px}.card h3{font-size:17px}.closing{margin-left:25px;margin-right:25px}.approach{gap:55px}.principles{font-size:10px}.footer-top p{display:none}}@media(max-width:700px){.nav{height:76px}.brand{font-size:21px}.brand img{width:29px;height:29px}.brand .domain{font-size:12px}nav{display:none}.reading-button{font-size:10px;padding:9px}.reading-button span{margin-left:5px}.hero{grid-template-columns:1fr;padding-top:37px;padding-bottom:30px;gap:30px}.hero h1{font-size:50px}.hero-art{height:290px}.hero-copy .eyebrow{font-size:9px}.hero-note{margin-top:18px}.principles{flex-wrap:wrap;gap:15px;justify-content:flex-start}.principles>span:first-child{width:100%}.principles>span:last-child{display:none}.research{padding-top:35px;padding-bottom:36px}.section-heading h2{font-size:25px}.filters{gap:6px}.filters button{padding:8px 10px;font-size:10px}.filter-bar{align-items:flex-start}.feed-status{font-size:8px}.feed-status>span:last-child{letter-spacing:0}.article-grid{grid-template-columns:1fr 1fr}.card-art{height:145px}.card h3{font-size:16px}.card-description{font-size:11px}.card-meta{font-size:8px;flex-wrap:wrap}.card-category{font-size:7px}.approach{grid-template-columns:1fr;gap:24px;padding-top:35px}.approach h2{font-size:32px}.closing{display:block;padding:27px}.closing h2{font-size:26px}.closing .primary{margin-top:22px}.footer-top{gap:20px}.footer-top>a:last-child{font-size:9px}.footer-bottom{display:block;line-height:1.8}.footer-bottom>span{display:block}.search-panel{flex-wrap:wrap}.search-panel label{width:100%}dialog{padding:30px 23px}.dialog-title{font-size:26px}}@media(max-width:430px){.article-grid{grid-template-columns:1fr}.card-art{height:195px}.card h3{font-size:21px}.card-description{min-height:0;font-size:13px}.card-body{padding:22px}.hero h1{font-size:46px}.wrap{padding-left:20px;padding-right:20px}.closing{margin-left:20px;margin-right:20px}.card-meta{font-size:10px}.card-category{font-size:9px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important}}

/* Sapphire surfaces and restrained light effects. */
:root{color-scheme:dark;--accent:#74d2ff}
body{background:radial-gradient(ellipse at 78% 12%,#14396755,transparent 35%),radial-gradient(ellipse at 5% 48%,#15326d30,transparent 40%),var(--bg)}
::selection{background:#2b66b7;color:#fff}
.header{background:linear-gradient(110deg,#112240bb,#080f20dd);box-shadow:0 1px 0 #85bdff09}
.brand img{filter:drop-shadow(0 0 9px #308aff40)}
nav a:hover,nav .active{color:#92dfff}
nav .active{border-bottom-color:#69ceff;text-shadow:0 0 18px #4bbcff66}
.reading-button{background:linear-gradient(140deg,#233e6080,#10203b70);box-shadow:inset 0 1px 0 #d6edff18;border-radius:8px}
.reading-button:hover,.reading-button[aria-pressed=true]{border-color:#65b8f3;background:#173a67}
.hero h1{font-weight:600;letter-spacing:-2.8px}
.hero h1 em{background:linear-gradient(100deg,#91e8ff 5%,#60abff 55%,#a0b7ff 100%);-webkit-background-clip:text;background-clip:text;color:transparent;filter:drop-shadow(0 3px 23px #4d9cff24)}
.eyebrow{color:#8fd4ff}
.dot{box-shadow:0 0 12px #60d9ff99}
.primary{position:relative;isolation:isolate;overflow:hidden;border:1px solid #6ab4ff80;border-radius:8px;box-shadow:inset 0 1px 0 #ffffff35,0 5px 23px #1769ee30;transition:transform .2s,box-shadow .2s}
.primary:before{content:'';position:absolute;inset:0;z-index:-1;background:linear-gradient(115deg,transparent 20%,#fff3 48%,transparent 72%);transform:translateX(-140%);transition:transform .65s;pointer-events:none}
.primary:hover:before,.primary:focus-visible:before{transform:translateX(140%)}
.primary:hover{background:linear-gradient(115deg,#246eea,#238feb);box-shadow:inset 0 1px 0 #ffffff40,0 7px 30px #268dff50}
.hero-art{border:1px solid #396da4; border-radius:18px;background:radial-gradient(ellipse at 50% 50%,#164b8055,transparent 68%),linear-gradient(135deg,#142e50,#071429 65%);box-shadow:inset 0 1px 0 #c2e9ff35,0 20px 70px #007fff15,0 0 50px #3188ff0a}
.hero-art:before{content:'';position:absolute;inset:0;background:linear-gradient(135deg,#d6f4ff12 0%,transparent 35%,transparent 65%,#347aff0d 100%);pointer-events:none;z-index:4}
.planet{width:174px;height:174px;box-shadow:inset 2px 2px 4px #f4feff77,-7px -3px 35px #59d5ff50,0 0 85px #167eff40,22px 15px 35px #020b20}
.orbit-one{box-shadow:0 0 12px #289bff22,inset 0 0 10px #289bff11}
.art-label,.art-footer{z-index:5}
.principles{background:linear-gradient(90deg,transparent,#19365b35,transparent)}
.filters button{background:#11223a70;border-radius:7px;transition:background .2s,border-color .2s}
.filters button:hover{background:#19365b}
.filters button[aria-pressed=true]{box-shadow:inset 0 1px 0 #c4e9ff30,0 3px 15px #167fff20}
.search-toggle{background:#12263e;border-radius:7px}
.search-toggle:hover{border-color:#66baff}
.card{border-color:#2b4260;border-radius:12px;background:linear-gradient(145deg,#172a44,#0e1b30 65%);box-shadow:inset 0 1px 0 #c2e4ff12;transition:transform .25s,box-shadow .25s,border-color .25s}
.card:hover,.card:focus-within{border-color:#528ccc;box-shadow:0 12px 32px #027dff18,0 0 0 1px #66baff18;transform:translateY(-4px)}
.card-art{border-bottom:1px solid #37577580}
.card-art:after{content:'';position:absolute;inset:0;background:linear-gradient(125deg,#d8f3ff14,transparent 42%,#56abff08);pointer-events:none}
.card-art svg{filter:drop-shadow(0 0 8px #55b9ff25)}
.art-badge{z-index:1;border:1px solid #8bbdff35;border-radius:5px;box-shadow:inset 0 1px 0 #fff1}
.save{padding:7px;border-radius:5px}
.save:hover{background:#213d63;color:#b7edff}
.search-panel input{color:var(--ink);border-color:#35557d}
.search-panel input::placeholder{color:#9bafcd}
.approach a{color:#8ed7ff}
.approach-points article>span{background:#173359;border:1px solid #325784;flex-shrink:0;width:31px;height:31px;padding:7px 0;text-align:center;border-radius:8px}
.closing{position:relative;overflow:hidden;background:radial-gradient(ellipse at 85% 0%,#287ec34a,transparent 65%),linear-gradient(115deg,#132b51,#133c68);border:1px solid #4372a7;box-shadow:inset 0 1px 0 #b9e4ff35,0 10px 50px #1275e012;border-radius:14px}
.closing:before{content:'';position:absolute;top:0;left:8%;right:8%;height:1px;background:linear-gradient(90deg,transparent,#b0edff,transparent)}
dialog{background:linear-gradient(145deg,#172c49,#0b172c);border-color:#4571a3;box-shadow:0 25px 100px #0008,inset 0 1px 0 #d0ecff22}
.dialog-source{border:1px solid #355b85;border-radius:8px}
.dialog-source a{color:#9adeff}
.dialog-close:hover{color:#7fdcff}
.toast{border:1px solid #568eca;box-shadow:0 8px 30px #0005}
@media(max-width:700px){.hero h1{letter-spacing:-2px}.hero-art{border-radius:13px}.planet{width:155px;height:155px}}
@media(prefers-reduced-motion:reduce){.primary:before{display:none}.primary:hover,.card:hover,.card:focus-within{transform:none}}

/* Subject guides and expanded research details. */
.subjects{padding-top:42px}
.subject-overview{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px;margin-top:24px}
.subject-card{display:flex;flex-direction:column;gap:13px;align-items:flex-start;text-align:left;color:var(--ink);padding:20px 17px;border:1px solid #355477;border-radius:10px;background:linear-gradient(145deg,#193453bb,#0c1b30);box-shadow:inset 0 1px 0 #c2e4ff12;transition:border-color .2s,transform .2s}
.subject-card:hover{border-color:#68c7ff;transform:translateY(-3px)}
.subject-number{font-size:8px;letter-spacing:1px;color:#8abce8}
.subject-card strong{font-size:15px;line-height:1.4}
.subject-card>span:not(.subject-number):not(.subject-link){font-size:11px;line-height:1.75;color:#a8bdd9}
.subject-link{font-size:10px;color:#8fdaff;margin-top:auto;padding-top:5px}
.subject-guide{display:grid;grid-template-columns:1.2fr 1fr;gap:36px;margin-top:24px;padding:28px;background:linear-gradient(120deg,#163452,#10213b);border:1px solid #365c83;border-radius:12px}
.subject-guide[hidden]{display:none}
.subject-guide h3{font-family:Manrope,Arial,sans-serif;font-size:23px;letter-spacing:-.5px;margin:12px 0}
.subject-guide p{font-size:13px;line-height:1.8;color:#b5c8df}
.subject-guide .eyebrow{font-size:9px;color:#8fd4ff}
.subject-guide .research-question{border-left:2px solid #66c9ff;padding-left:14px;margin-top:19px}
.subject-guide .research-question strong{color:#e0f4ff;font-size:11px}
.subject-terms h4{font-size:13px;margin:10px 0 18px}
.subject-terms dt{font-size:12px;color:#8ddaff;font-weight:600;margin-top:13px}
.subject-terms dd{font-size:12px;color:#b5c8df;line-height:1.75;margin:4px 0 0}
.key-facts{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:25px 0}
.key-facts>div{padding:19px;background:linear-gradient(140deg,#214571,#122d4c);border:1px solid #416c97;border-radius:9px}
.key-facts strong{display:block;font-size:21px;letter-spacing:-.5px;color:#93e0ff;line-height:1.4;margin-bottom:9px}
.key-facts span{font-size:12px;line-height:1.75;color:#c2d3e7}
.dialog-list{padding-left:20px;color:#b6c7e0;font-size:14px;line-height:1.9}
.dialog-list li+li{margin-top:5px}
.watch-next{border-left:2px solid #6ad6ff;padding:1px 0 1px 18px;margin:24px 0}
.watch-next h3{font-size:15px;margin:8px 0}
.watch-next .dialog-text{margin:8px 0}
.dialog-source ol{padding-left:19px}
.dialog-source li{padding:6px 0}
.related-reading{margin-top:30px;border-top:1px solid #355374;padding-top:15px}
.related-reading h3{font-size:15px}
.related-reading button{display:flex;width:100%;justify-content:space-between;gap:15px;text-align:left;color:#bfe8ff;border:1px solid #375d83;background:#142e4d;border-radius:7px;padding:13px;margin:10px 0;font-size:12px;line-height:1.6}
.related-reading button:hover{background:#1d4169;border-color:#62b7ee}
@media(max-width:1000px){.subject-overview{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:700px){.subject-overview{grid-template-columns:repeat(2,minmax(0,1fr))}.subject-guide{grid-template-columns:1fr;gap:10px;padding:22px}.key-facts{grid-template-columns:1fr}.subject-card{padding:17px 14px}.subject-card strong{font-size:14px}.subjects{padding-top:32px}}
@media(prefers-reduced-motion:reduce){.subject-card:hover{transform:none}}

/* Topic-specific illustrations stay legible at every card size. */
.subject-picture{width:calc(100% + 34px);margin:-20px -17px 3px;overflow:hidden;border-radius:9px 9px 0 0;border-bottom:1px solid #355477}
.subject-picture svg{display:block;width:100%;height:auto;aspect-ratio:360/190}
.card-art svg{display:block}
@media(max-width:700px){.subject-picture{width:calc(100% + 28px);margin:-17px -14px 3px}}

/* Discovery timeline and evidence labels. */
.subject-overview{grid-template-columns:repeat(3,minmax(0,1fr))}
.milestones{padding-top:55px;padding-bottom:15px}
.milestone-intro{color:var(--muted);font-size:13px;line-height:1.8;margin:20px 0}
.milestone-count{font-size:10px;color:#a4b7d3;margin:18px 0}
.milestone-list{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:1fr 1fr;column-gap:30px}
.milestone-list li{display:grid;grid-template-columns:95px 1fr;gap:18px;padding:19px 0;border-top:1px solid #2d4665}
.milestone-list time{font-size:11px;color:#8bd7ff;padding-top:3px;line-height:1.6}
.milestone-kind{font-size:8px;letter-spacing:1.2px;text-transform:uppercase;color:#a6b7d0}
.milestone-list button{display:block;background:none;border:0;padding:7px 0;text-align:left;color:#e6f2ff;font-size:14px;line-height:1.6}
.milestone-list button:hover{color:#79d6ff}
.milestone-list button span{color:#75d5ff}
.theory-callout{display:flex;gap:25px;align-items:center;justify-content:space-between;padding:25px;background:linear-gradient(120deg,#1c2c51,#11233b);border:1px solid #476291;border-radius:12px;margin-top:22px}
.theory-callout h3{font-size:22px;margin:10px 0;color:#dbe9ff}
.theory-callout p:not(.eyebrow){color:#b7c7df;font-size:12px;line-height:1.8;max-width:660px}
.theory-callout .primary{flex-shrink:0}
.evidence-label{display:inline-block;color:#a5e5ff;background:#1a3c60;border:1px solid #507ca4;border-radius:5px;padding:7px 10px;font-size:10px;letter-spacing:1px;margin:0 0 5px}
@media(max-width:700px){.subject-overview{grid-template-columns:repeat(2,minmax(0,1fr))}.milestone-list{grid-template-columns:1fr}.milestone-list li{grid-template-columns:88px 1fr;gap:13px}.theory-callout{display:block}.theory-callout .primary{margin-top:10px}.milestones{padding-top:35px}}

/* Interactive learning, publisher media and article illustrations. */
.visual-learning{padding-top:48px;padding-bottom:15px}
.learning-layout{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(230px,1fr);gap:24px;margin-top:28px;align-items:start}
.learning-player{padding:22px;border:1px solid #385d84;border-radius:12px;background:linear-gradient(140deg,#142d4a,#0d1d33)}
.learning-player h3{font-size:17px;line-height:1.5;margin:20px 0 14px}
.lesson-select-label{display:block;font-size:11px;color:#a6cce9;margin-bottom:8px}
.learning-player select{width:100%;padding:10px;border:1px solid #52769b;border-radius:6px;background:#10223c;color:#dff2ff;font:inherit}
.lesson-stage svg{display:block;width:100%;height:auto;border-radius:9px}
.lesson-caption{font-size:13px;line-height:1.75;color:#d4ebff;min-height:46px;margin:16px 0}
.lesson-controls{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.lesson-controls button{background:#214b78;border:1px solid #578bb7;border-radius:5px;color:#ebf8ff;padding:8px 10px;font-size:11px;min-height:36px}
.lesson-controls button:hover{background:#2a6196}
.lesson-controls button[aria-pressed=true]{background:#346694;border-color:#b0e9ff}
.lesson-controls label{color:#c0d2e7;font-size:10px;margin-left:4px}
.lesson-controls input{accent-color:#71cfff;min-width:65px;flex:1;width:90px}
.lesson-note,.media-hint{font-size:11px;line-height:1.75;color:#a8bdd5;margin:16px 0 0}
.media-library{padding:20px 4px}
.media-library h3{margin:0 0 10px;font-size:18px;line-height:1.5}
.media-library>p{font-size:12px;color:#a8bdd5;line-height:1.8}
.media-library>a,.media-links>a{display:block;padding:14px 16px;margin:12px 0;border:1px solid #365579;border-radius:8px;background:#142a45;transition:border-color .2s}
.media-library>a:hover,.media-links>a:hover{border-color:#82d8ff;background:#1b3859}
.media-library a span,.media-links a span{display:block;font-size:9px;color:#8fd4ff;letter-spacing:.6px;margin-bottom:8px}
.media-library a strong,.media-links a strong{font-size:13px;line-height:1.6;font-weight:500;color:#def1ff}
.article-illustration{margin:24px 0}
.article-illustration svg{width:100%;height:auto;display:block;border:1px solid #395776;border-radius:9px}
.article-illustration figcaption{font-size:10px;color:#a4bbd3;margin-top:8px}
.article-media{margin:28px 0;border-top:1px solid #395776;padding-top:12px}
.article-media>h3{font-size:17px;margin-top:22px}
.article-media .learning-player{padding:16px}
@media(max-width:850px){.learning-layout{grid-template-columns:1fr}.media-library{padding:0}.media-library>a{margin:10px 0}}
@media(max-width:430px){.learning-player{padding:14px}.lesson-controls label{margin-left:0}.lesson-controls input{flex-basis:100%}.lesson-caption{min-height:70px}.lesson-controls button{padding:8px}.article-media .learning-player{padding:11px}}

/* Permanent article pages and transparent editorial credits. */
.standalone{max-width:860px;padding-top:38px;padding-bottom:65px}
.standalone h1{font-family:Manrope,Arial,sans-serif;font-size:clamp(30px,5vw,48px);font-weight:600;letter-spacing:-1.4px;line-height:1.2;margin:23px 0}
.standalone h2{font-size:23px;line-height:1.4;margin-top:30px}
.standalone>p,.standalone>ul{color:#b6c7e0;font-size:15px;line-height:1.9}
.standalone .standfirst{color:#c5ddf4;font-size:18px;line-height:1.7}
.standalone a:not(.brand),.permalink a,.footer-credits a{color:#9bdcff;text-decoration:underline;text-underline-offset:3px}
.breadcrumbs{font-size:12px!important;line-height:1.8}
.standalone .related-reading li{margin:13px 0;line-height:1.7}
.editorial-note,.footer-credits,.permalink{font-size:12px;color:#a9bfd8;line-height:1.8;margin-top:24px}
.footer-credits{margin:0 0 22px}
.card-image-button:focus-visible{outline-offset:-4px}
/* Referenced history and clearly labelled future outlooks. */
.concept-history{margin:2.5rem 0;padding-top:1.5rem;border-top:1px solid #284568}
.concept-timeline{list-style:none;padding:0;margin:1.5rem 0 2.5rem}
.concept-timeline li{display:grid;grid-template-columns:110px 1fr;gap:1.4rem;padding:0 0 1.8rem;position:relative}
.concept-timeline li>div{border-left:2px solid #2c6898;padding-left:1.4rem}
.history-date{color:#87d9ff;font-weight:700;font-size:.88rem;padding-top:.2rem}
.concept-history h3{margin:0 0 .6rem;line-height:1.45}
.concept-history p{color:#b4c3da;line-height:1.8;margin:.5rem 0 1rem}
.future-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem;margin:1.4rem 0}
.future-card{padding:1.4rem;border:1px solid #385281;border-radius:14px;background:linear-gradient(135deg,#142b48,#151d37)}
.future-status{display:inline-block;color:#c4b3ff;font-size:.74rem;text-transform:uppercase;letter-spacing:.07em;margin-bottom:.8rem}
.history-sources{padding:1rem 1.2rem;border:1px solid #294365;border-radius:10px;margin:1.5rem 0 2rem;color:#b4c3da}
.history-sources summary{cursor:pointer;color:#91d7ff;font-weight:600}
.history-sources li{margin:.65rem 0;overflow-wrap:anywhere}
.history-sources a{color:#91d7ff}
.concept-history .lesson-caption{min-height:7rem}
@media(max-width:600px){.future-grid{grid-template-columns:1fr}.concept-timeline li{grid-template-columns:1fr;gap:.6rem}.concept-timeline li>div{padding-left:1rem}.concept-history .lesson-caption{min-height:0}}
/* Historical milestones have their own layout and topic controls. */
.milestones{padding-top:56px;padding-bottom:56px;min-width:0}
.milestones .section-heading{flex-wrap:wrap;align-items:start}
.milestones .section-heading>p{max-width:290px;line-height:1.7}
.milestone-intro{color:var(--muted);line-height:1.8;max-width:800px;margin:20px 0}
.milestone-count{color:#9fb8d8;font-size:12px;margin:18px 0}
.milestone-list{list-style:none;padding:0;margin:0;display:grid;gap:12px}
.milestone-list li{display:grid;grid-template-columns:145px minmax(0,1fr);gap:24px;padding:22px 26px;border:1px solid #294c73;border-radius:12px;background:linear-gradient(110deg,#163352b0,#101d34);box-shadow:inset 0 1px 0 #a9dcff0d;align-items:center}
.milestone-list time{color:#85d8ff;font-weight:600;font-size:13px;font-variant-numeric:tabular-nums}
.milestone-list li>div{min-width:0;border-left:2px solid #418ecc;padding-left:24px}
.milestone-kind{display:block;color:#9db4d1;text-transform:uppercase;letter-spacing:.1em;font-size:10px;margin-bottom:8px}
.milestone-list a,.milestone-list button{display:block;background:none;border:0;padding:0;color:#edf5ff;font-size:17px;font-weight:600;line-height:1.5;text-align:left;overflow-wrap:anywhere}
.milestone-list a:hover,.milestone-list button:hover{color:#8cdeff}
.milestone-list a span{color:#75ceff;white-space:nowrap}
.theory-callout{display:flex;align-items:center;justify-content:space-between;gap:28px;padding:28px;margin-top:26px;border:1px solid #3b5282;border-radius:12px;background:linear-gradient(115deg,#152b48,#191c37)}
.theory-callout h3{font-size:21px;margin:12px 0}
.theory-callout p:not(.eyebrow){color:var(--muted);line-height:1.8;max-width:700px}
.theory-callout .primary{flex-shrink:0}
@media(max-width:600px){.milestones{padding-top:32px;padding-bottom:32px}.milestone-list li{grid-template-columns:1fr;gap:12px;padding:19px}.milestone-list li>div{padding-left:15px}.milestone-list a{font-size:16px}.theory-callout{flex-direction:column;align-items:flex-start;padding:22px}}

/* Custom MT monogram and paired wordmark. */
.brand{gap:11px;white-space:nowrap;flex-shrink:0;letter-spacing:-.9px}
.brand img{width:42px;height:42px;margin-right:0;filter:drop-shadow(0 3px 10px #228ce533)}
.brand .brand-wordmark{font-weight:800;color:#edf8ff;display:inline-block}
.brand .brand-tech{font-weight:600;color:#7ddcff}
.brand .domain{font-size:13px;letter-spacing:0;color:#97afd0;font-weight:500;margin-left:2px}
.footer-top .brand img{width:35px;height:35px}
@media(max-width:700px){.brand{font-size:20px;gap:9px}.brand img{width:35px;height:35px}.brand .domain{font-size:11px}}
/* Practical AI guides share the article and dialog layouts. */
.editorial-section { margin-block: 2rem; }
.agent-prompt { white-space: pre-wrap; overflow-wrap: anywhere; padding: 1.25rem; border: 1px solid #36445e; border-radius: 12px; background: #101a2c; color: #e0e8f5; line-height: 1.7; font-size: .9rem; }
.agent-prompt code { font-family: ui-monospace, Consolas, monospace; }

.editorial-section { margin-block: 2rem; }
.agent-prompt { white-space: pre-wrap; overflow-wrap: anywhere; padding: 1.25rem; border: 1px solid #36445e; border-radius: 12px; background: #101a2c; color: #e0e8f5; line-height: 1.7; font-size: .9rem; }
.agent-prompt code { font-family: ui-monospace, Consolas, monospace; }

.pqc-explainer { margin-block: 2.5rem; }
.pqc-explainer-frame { display: block; width: 100%; height: 880px; border: 1px solid var(--line); border-radius: 16px; background: #020617; margin-top: 1.5rem; }
@media(max-width: 600px) { .pqc-explainer-frame { height: 760px; } }