:root{--black:#050708;--panel:#0d1315;--paper:#eff1eb;--muted:#b3c0bf;--cyan:#a6f4f4;--cyan-soft:#71bbbd;--amber:#e8d29a;--red:#f15f53;--line:rgba(184,232,231,.22);--mono:"DM Mono",ui-monospace,monospace;--sans:"Manrope",system-ui,sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--black);color:var(--paper);font:16px/1.6 var(--sans);overflow-x:clip}a{color:inherit;text-decoration:none}button{font:inherit}button,a{touch-action:manipulation}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid var(--cyan);outline-offset:4px}.skip-link{position:fixed;z-index:100;left:1rem;top:-5rem;background:var(--cyan);color:var(--black);padding:.8rem 1rem;font-weight:700}.skip-link:focus{top:1rem}.site-noise{position:fixed;inset:0;z-index:20;pointer-events:none;opacity:.035;mix-blend-mode:screen;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 160 160' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}.site-header{position:fixed;inset:0 0 auto;z-index:30;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:1.5rem;padding:1.1rem clamp(1rem,4vw,4rem);transition:.25s background-color}.site-header.is-solid{background:rgba(5,7,8,.94);border-bottom:1px solid var(--line);backdrop-filter:blur(16px)}.wordmark,.studio-link,.primary-nav,.eyebrow,.section-kicker,.intro-meta,.sequence-control,.case-stamp,.case-card span,.season-legend,.episode-row span,.episode-row time,.episode-row em,.detail-index,.language-notes dt,.grammar-grid span,.grammar-grid strong,.site-footer{font-family:var(--mono);letter-spacing:.09em;text-transform:uppercase}.wordmark{display:flex;align-items:center;gap:.65rem;width:max-content;font-size:.78rem;font-weight:700}.wordmark-mark{position:relative;width:1.1rem;height:1.1rem}.wordmark-mark:before,.wordmark-mark:after{content:"";position:absolute;border:1px solid var(--cyan);border-radius:50%;inset:0}.wordmark-mark:after{border-color:var(--red);inset:.28rem}.wordmark-mark i{position:absolute;left:50%;top:-.2rem;width:1px;height:1.45rem;background:var(--cyan);transform:rotate(45deg)}.wordmark-mark i:nth-child(2){background:var(--red);transform:rotate(-45deg)}.wordmark-mark i:nth-child(3){top:.48rem;left:.48rem;width:.18rem;height:.18rem;background:var(--paper);border-radius:50%;transform:none}.primary-nav{display:flex;gap:1.25rem;font-size:.72rem;color:var(--paper)}.primary-nav a:hover,.studio-link:hover,.text-link:hover{color:var(--cyan)}.studio-link{justify-self:end;display:flex;align-items:center;gap:.5rem;font-size:.7rem}.studio-mobile{display:none}.status-dot{width:.45rem;height:.45rem;border-radius:50%;background:var(--red);box-shadow:0 0 14px var(--red)}.intro{position:relative;min-height:100svh;display:grid;align-items:end;overflow:hidden;border-bottom:1px solid var(--line)}.intro-media,.intro-image,.intro-vignette,.intro-grid{position:absolute;inset:0}.intro-media{background:#020304}.intro-image{width:100%;height:100%;object-fit:cover;object-position:center;opacity:0;filter:saturate(.75) contrast(1.06);transition:opacity .8s ease}.intro-image.is-active{opacity:1}.intro-vignette{background:linear-gradient(90deg,rgba(3,5,6,.94),rgba(3,5,6,.54) 42%,rgba(3,5,6,.2) 75%,rgba(3,5,6,.72)),linear-gradient(0deg,rgba(5,7,8,.98),transparent 35%)}.intro-grid{opacity:.14;background-image:linear-gradient(rgba(166,244,244,.15) 1px,transparent 1px),linear-gradient(90deg,rgba(166,244,244,.15) 1px,transparent 1px);background-size:96px 96px;mask-image:linear-gradient(90deg,black,transparent 78%)}.intro-layout{position:relative;z-index:2;display:grid;grid-template-columns:minmax(0,1fr) minmax(14rem,21rem);gap:2rem;align-items:end;width:min(78rem,calc(100% - 2.5rem));margin:0 auto;padding:10rem 0 10rem}.intro-content{max-width:47rem}.eyebrow,.section-kicker{margin:0 0 1.2rem;color:var(--cyan);font-size:.74rem}.intro h1,h2,h3{margin:0;line-height:1.02;letter-spacing:-.045em;font-weight:600}.intro h1{max-width:11ch;font-size:clamp(3.2rem,7.5vw,7.6rem)}.intro h1 em{color:var(--cyan);font-style:normal}.intro-deck{max-width:39rem;margin:1.5rem 0 2rem;font-size:clamp(1rem,1.4vw,1.2rem);color:var(--paper)}.button{display:inline-flex;align-items:center;justify-content:space-between;gap:2.5rem;min-height:3.1rem;padding:.8rem 1rem;border:1px solid var(--cyan);font:700 .76rem var(--mono);letter-spacing:.08em;text-transform:uppercase;transition:.2s transform,.2s background}.button:hover{transform:translateY(-2px)}.button-primary{background:var(--cyan);color:var(--black)}.button-primary:hover{background:var(--paper);border-color:var(--paper)}.button-outline{color:var(--paper);border-color:var(--paper)}.button-outline:hover{background:var(--paper);color:var(--black)}.intro-meta{display:grid;gap:.7rem;margin:0;font-size:.72rem}.intro-meta div{display:flex;justify-content:space-between;gap:1rem;padding:.55rem 0;border-bottom:1px solid var(--line)}.intro-meta dt{color:var(--muted)}.intro-meta dd{margin:0;color:var(--paper);text-align:right}.sequence-control{position:absolute;z-index:3;left:max(1.25rem,calc((100% - 78rem)/2));right:max(1.25rem,calc((100% - 78rem)/2));bottom:1.4rem;font-size:.72rem;background:linear-gradient(90deg,rgba(5,7,8,.85),rgba(5,7,8,.54));padding:.55rem .7rem}.sequence-topline{display:flex;justify-content:space-between;align-items:center;gap:1rem;margin-bottom:.5rem;color:var(--paper)}.red-mark{color:var(--red)}.sequence-toggle{min-height:2.5rem;border:0;background:transparent;color:var(--paper);cursor:pointer;font:inherit;text-transform:uppercase}.sequence-frames{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:.6rem}.sequence-frame{display:grid;grid-template-columns:auto 1fr;gap:.65rem;min-height:3rem;padding:.55rem 0;border:0;border-top:2px solid var(--line);background:transparent;color:var(--paper);cursor:pointer;text-align:left;text-transform:uppercase;font:inherit;letter-spacing:.09em}.sequence-frame[aria-pressed="true"]{border-color:var(--cyan);color:var(--cyan)}.frame-index{color:var(--red)}.sequence-progress{height:2px;background:rgba(166,244,244,.2)}.sequence-progress span{display:block;width:0;height:100%;background:var(--cyan)}.section-shell{width:min(78rem,calc(100% - 2.5rem));margin:0 auto;padding:clamp(5.5rem,11vw,10rem) 0;border-top:1px solid var(--line)}.section-kicker{color:var(--muted)}.section-kicker:before{content:"";display:inline-block;width:2rem;height:1px;margin-right:.7rem;vertical-align:middle;background:var(--red)}.signal-grid,.language-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(3rem,10vw,9rem)}.signal h2{max-width:9ch;font-size:clamp(3rem,6vw,6.5rem)}.signal-quote{max-width:32rem;margin:2rem 0 0;color:var(--cyan);font-size:clamp(1.1rem,1.6vw,1.35rem)}.signal-copy{align-self:end;max-width:34rem;color:var(--muted)}.signal-copy .lede{color:var(--paper);font-size:1.25rem;line-height:1.45}.text-link{display:inline-flex;margin-top:1rem;padding-bottom:.2rem;border-bottom:1px solid var(--cyan);color:var(--cyan);font:700 .75rem var(--mono);letter-spacing:.08em;text-transform:uppercase}.case-head,.season-heading{display:flex;justify-content:space-between;align-items:end;gap:2rem;margin-bottom:3rem}.case-head h2,.season-heading h2,.language h2,.faq h2,.closing h2{font-size:clamp(2.6rem,5.4vw,5.7rem)}.case-stamp{padding:.5rem .7rem;border:1px solid var(--red);color:var(--red);font-size:.7rem}.case-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border-top:1px solid var(--line);border-left:1px solid var(--line)}.case-card{min-height:20rem;padding:1.3rem;border-right:1px solid var(--line);border-bottom:1px solid var(--line);background:linear-gradient(155deg,rgba(166,244,244,.06),transparent 60%)}.case-card-alert{background:linear-gradient(155deg,rgba(241,95,83,.11),transparent 60%)}.case-number{margin-bottom:4rem;color:var(--red);font:700 .75rem var(--mono)}.case-card h3{font-size:1.55rem}.case-card p{color:var(--muted)}.case-card span{color:var(--cyan);font-size:.65rem}.season-heading>div p,.language-grid>div>p{max-width:34rem;color:var(--muted)}.season-legend{white-space:nowrap;color:var(--muted);font-size:.7rem}.episode-list{border-top:1px solid var(--line)}.episode-row{display:grid;grid-template-columns:3rem minmax(9rem,1.7fr) 5rem minmax(9rem,.8fr);gap:.7rem;align-items:center;width:100%;min-height:3.8rem;padding:.9rem .3rem;border:0;border-bottom:1px solid var(--line);background:transparent;color:var(--paper);text-align:left;cursor:pointer}.episode-row:hover,.episode-row[aria-pressed="true"]{background:rgba(166,244,244,.09);color:var(--cyan)}.episode-row span{color:var(--red);font-size:.72rem}.episode-row strong{font-size:1.05rem}.episode-row time,.episode-row em{font-size:.68rem;font-style:normal;color:var(--muted)}.episode-detail{display:grid;grid-template-columns:10rem 1fr;gap:2rem;max-width:53rem;padding:2rem 0 0 3.7rem;color:var(--muted)}.detail-index{margin:0;color:var(--cyan);font-size:.72rem}.language-grid{align-items:end}.language-grid>div>p{font-size:1.1rem}.language-notes{margin:0}.language-notes div{padding:.8rem 0;border-top:1px solid var(--line)}.language-notes dt{color:var(--paper);font-size:.72rem}.language-notes dd{margin:.3rem 0 0;color:var(--muted)}.grammar-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));margin-top:4rem;border-top:1px solid var(--line);border-left:1px solid var(--line)}.grammar-grid article{min-height:12rem;padding:1.3rem;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}.grammar-grid span{display:block;color:var(--red);font-size:.7rem}.grammar-grid strong{display:block;margin:3rem 0 .5rem;color:var(--cyan);font-size:.78rem}.grammar-grid p{margin:0;color:var(--muted)}.faq h2{margin-bottom:2rem}.faq-list{max-width:55rem;border-top:1px solid var(--line)}.faq details{border-bottom:1px solid var(--line);padding:1.2rem 0}.faq summary{cursor:pointer;font-size:1.15rem;font-weight:700}.faq details p{max-width:44rem;color:var(--muted)}.closing{position:relative;min-height:38rem;display:flex;align-items:end;overflow:hidden}.closing-image{position:absolute;inset:6% 0 0;background:url("./assets/generated-threshold.webp") center/cover;filter:saturate(.65) brightness(.62);opacity:.7}.closing-image:after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,var(--black),transparent 65%),linear-gradient(0deg,var(--black),transparent 55%)}.closing-copy{position:relative;z-index:1;max-width:36rem;padding-bottom:2rem}.closing-copy>p:not(.section-kicker){color:var(--muted);font-size:1.1rem}.site-footer{display:grid;grid-template-columns:1fr auto auto 1fr;gap:1.5rem;align-items:center;padding:2rem clamp(1rem,4vw,4rem);border-top:1px solid var(--line);color:var(--muted);font-size:.68rem}.site-footer p{margin:0}.site-footer a{color:var(--cyan)}.site-footer>span{text-align:right}.js .reveal{opacity:0;transform:translateY(1.2rem);transition:opacity .6s ease,transform .6s ease}.js .reveal.is-visible{opacity:1;transform:none}@media(max-width:900px){.site-header{grid-template-columns:1fr auto}.primary-nav{display:none}.studio-link{font-size:.65rem}.intro-layout{grid-template-columns:1fr;padding-bottom:14rem}.intro-meta{width:min(26rem,100%)}.signal-grid,.language-grid{grid-template-columns:1fr;gap:3rem}.case-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.site-footer{grid-template-columns:1fr 1fr}.site-footer>span{text-align:left;grid-column:1/-1}}@media(max-width:620px){.site-header{padding:.9rem 1rem}.wordmark{font-size:.68rem}.studio-link{max-width:none;min-height:2.75rem;text-align:right;line-height:1.25}.studio-desktop{display:none}.studio-mobile{display:inline}.sequence-toggle{min-height:2.75rem;min-width:8.5rem;padding:0 .65rem;border:1px solid var(--line);background:rgba(166,244,244,.08);white-space:nowrap}.sequence-frame{align-items:center;padding:.45rem .3rem;background:rgba(255,255,255,.025)}.intro{display:block;min-height:0;padding-top:4.3rem}.intro-media{bottom:auto;height:27rem}.intro-vignette,.intro-grid{bottom:auto;height:27rem}.intro-vignette{background:linear-gradient(0deg,var(--black),rgba(5,7,8,.3) 65%,rgba(5,7,8,.55))}.intro-layout{display:block;width:calc(100% - 2rem);padding:4.3rem 0 1.25rem}.intro-content{max-width:100%}.intro h1{max-width:9ch;font-size:clamp(2.9rem,13vw,4.2rem)}.intro-deck{max-width:22rem;margin:1rem 0 1.25rem}.button{width:100%;max-width:23rem}.intro-meta{position:relative;width:100%;margin-top:2.2rem;font-size:.68rem}.intro-meta div{min-width:0;gap:.6rem}.intro-meta dt{flex:0 0 auto}.intro-meta dd{min-width:0;overflow-wrap:anywhere}.sequence-control{position:relative;left:auto;right:auto;bottom:auto;margin:0 1rem calc(1.5rem + env(safe-area-inset-bottom));padding:.8rem .8rem calc(.8rem + env(safe-area-inset-bottom));background:rgba(13,19,21,.95)}.sequence-topline{align-items:flex-start;font-size:.66rem}.sequence-toggle{min-height:2.75rem;min-width:8.5rem;white-space:nowrap}.sequence-frames{grid-template-columns:repeat(2,minmax(0,1fr));gap:.35rem}.sequence-frame{min-height:3.25rem;padding:.45rem 0;font-size:.7rem}.section-shell{width:calc(100% - 2rem);padding:5rem 0}.section-kicker{font-size:.68rem}.case-head,.season-heading{display:block}.case-stamp,.season-legend{display:inline-block;margin-top:1.2rem}.case-grid,.grammar-grid{grid-template-columns:1fr}.case-card{min-height:0}.case-number{margin-bottom:2.4rem}.episode-row{grid-template-columns:2rem minmax(0,1fr) 4rem;gap:.25rem}.episode-row em{display:none}.episode-row strong{font-size:.92rem}.episode-row time{font-size:.66rem;text-align:right}.episode-detail{grid-template-columns:1fr;gap:.5rem;padding:1.5rem 0 0}.grammar-grid{margin-top:2.5rem}.grammar-grid article{min-height:9rem}.grammar-grid strong{margin-top:2rem}.closing{min-height:34rem}.site-footer{grid-template-columns:1fr;gap:.7rem;padding:1.5rem 1rem}.site-footer>span{grid-column:auto}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}

/* Science primer — The Periphery home */
.science-primer{padding-top:clamp(5rem,11vw,10rem);padding-bottom:clamp(5rem,11vw,10rem);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.science-primer-head{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(18rem,.75fr);gap:clamp(2rem,8vw,9rem);align-items:end;margin-bottom:3.5rem}.science-primer-head h2{max-width:12ch}.science-primer-head .lede{margin-top:0}.science-primer-head .button{margin-top:1.4rem}.science-primer-grid{display:grid;grid-template-columns:repeat(5,1fr);border:1px solid var(--line);background:rgba(166,244,244,.025)}.science-node{position:relative;min-height:20rem;padding:1.4rem;display:flex;flex-direction:column;gap:1.25rem;border-right:1px solid var(--line);overflow:hidden;transition:background .25s,color .25s}.science-node:last-child{border-right:0}.science-node:before{content:"";position:absolute;inset:auto -12% -40% auto;width:11rem;height:11rem;border:1px solid rgba(166,244,244,.24);border-radius:50%;transition:transform .35s}.science-node:hover{background:var(--cyan);color:var(--black)}.science-node:hover:before{transform:scale(1.45)}.science-node span{font:400 .62rem/1.4 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--cyan-soft)}.science-node:hover span{color:#1b6869}.science-node strong{position:relative;z-index:1;font-size:1.12rem;line-height:1.23}.science-node p{position:relative;z-index:1;margin:0;font-size:.8rem;line-height:1.55;color:var(--muted)}.science-node:hover p{color:#183a3a}.science-node i{position:relative;z-index:1;margin-top:auto;font:1.25rem/1 var(--mono);font-style:normal}.science-node-alert:before{border-color:rgba(241,95,83,.55)}.science-primer-foot{display:flex;align-items:flex-start;gap:.75rem;max-width:47rem;margin:1.4rem 0 0 auto;color:var(--muted);font-size:.84rem}.science-primer-foot p{margin:0}@media(max-width:980px){.science-primer-head{grid-template-columns:1fr}.science-primer-grid{grid-template-columns:repeat(2,1fr)}.science-node{min-height:15rem;border-bottom:1px solid var(--line)}.science-node:nth-child(2){border-right:0}.science-node:last-child{border-bottom:0}}@media(max-width:560px){.science-primer-grid{grid-template-columns:1fr}.science-node,.science-node:nth-child(2){border-right:0}.science-node{min-height:13rem}.science-primer-foot{margin-top:1rem}}

/* Science surface QA pass — tighten visual hierarchy */
.science-primer{padding-top:clamp(4.5rem,7vw,6.5rem);padding-bottom:clamp(4.5rem,7vw,6.5rem)}
.science-primer-head{align-items:start}.science-primer-head h2{max-width:15ch}
.science-node span{color:var(--cyan)}.science-node:before{width:8.5rem;height:8.5rem;bottom:-28%}
.science-node-alert:before{border-color:rgba(166,244,244,.45)}
.science-primer-foot{margin:1.4rem auto 0 0;max-width:44rem}.science-primer-foot p{max-width:40rem}
.science-primer-foot{display:grid;grid-template-columns:3.7rem minmax(0,1fr);gap:1rem;align-items:center}.primer-decoder-mark{display:block;width:3.7rem;height:3.7rem;object-fit:contain}.science-status{display:block;margin-bottom:.4rem;font:400 .62rem/1.35 var(--mono);letter-spacing:.09em;text-transform:uppercase;color:var(--cyan)}.science-status .red-mark{margin-right:.35rem}@media(max-width:560px){.science-primer-foot{grid-template-columns:3rem minmax(0,1fr);gap:.75rem}.primer-decoder-mark{width:3rem;height:3rem}}