/* gavin-black.com
   Graphite, low-poly, quiet. No framework. Edit tokens in :root first.
   The animated background lives in assets/js/bg.js; this file never animates
   anything expensive (no backdrop-filter over the canvas, no large blurs). */

@font-face{font-family:"Plex Sans";src:url("../fonts/ibm-plex-sans-latin-400-normal.woff2") format("woff2");font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:"Plex Sans";src:url("../fonts/ibm-plex-sans-latin-600-normal.woff2") format("woff2");font-weight:500 700;font-style:normal;font-display:swap}
@font-face{font-family:"Plex Mono";src:url("../fonts/ibm-plex-mono-latin-400-normal.woff2") format("woff2");font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:"Plex Mono";src:url("../fonts/ibm-plex-mono-latin-500-normal.woff2") format("woff2");font-weight:500 700;font-style:normal;font-display:swap}

:root{
  color-scheme:dark;
  --bg:#0c0d0e;
  --bg-2:#101113;
  --panel:#141619;
  --panel-2:#191c1f;
  --panel-3:#20242a;
  --text:#e9ebea;
  --text-2:#c4c9c6;
  --muted:#959c98;
  --muted-2:#6d7470;
  --line:rgba(255,255,255,.085);
  --line-2:rgba(255,255,255,.16);
  --accent:#cdb892;        /* warm sand: kickers, markers, focus */
  --accent-dim:rgba(205,184,146,.14);
  --steel:#9fb2bf;         /* cool: links in running text */
  --chamfer:12px;
  --max:1180px;
  --gutter:clamp(16px, 4vw, 32px);
  --sans:"Plex Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono:"Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{
  margin:0;
  min-height:100vh;
  background:var(--bg);
  color:var(--text);
  font:16px/1.6 var(--sans);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img,svg,video,canvas{display:block;max-width:100%}
a{color:var(--steel);text-decoration:none;text-underline-offset:3px}
a:hover{color:var(--text);text-decoration:underline}
p{margin:0 0 1em}
h1,h2,h3,h4{margin:0;font-weight:600;line-height:1.15;letter-spacing:-.01em}
ul{margin:0;padding:0}
button{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
::selection{background:rgba(205,184,146,.35);color:#fff}

.skip{position:absolute;left:-999px;top:8px;z-index:100;padding:8px 12px;background:var(--text);color:var(--bg)}
.skip:focus{left:8px}

/* ---------------------------------------------------------------- background */
#bg{
  position:fixed;inset:0;z-index:-2;
  width:100vw;height:100vh;
  pointer-events:none;
  background:var(--bg);
}
/* Static shade over the moving mesh: keeps text contrast high and the motion
   quiet. It never changes, so it costs nothing per frame. */
.bg-shade{
  position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:
    radial-gradient(120% 80% at 70% 0%, transparent 0 45%, rgba(12,13,14,.5) 80%),
    linear-gradient(180deg, rgba(12,13,14,.05) 0, rgba(12,13,14,.5) 65%, rgba(12,13,14,.78) 100%);
}

.wrap{width:min(var(--max), 100% - 2*var(--gutter));margin-inline:auto}

/* ---------------------------------------------------------------- header */
.site-header{
  position:sticky;top:0;z-index:30;
  background:rgba(12,13,14,.9);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:64px}
.brand{display:flex;align-items:center;gap:12px;color:var(--text);text-decoration:none;min-width:0}
.brand:hover{text-decoration:none;color:var(--text)}
.brand .mark{width:32px;height:32px;flex:none;transition:transform .7s cubic-bezier(.2,.7,.2,1)}
.brand:hover .mark,.brand:focus-visible .mark{transform:rotate(51.4286deg)}  /* 360/7: the outline lands on itself */
.brand-text{display:flex;flex-direction:column;justify-content:center;min-width:0}
.brand-name{display:block;font-weight:600;font-size:15px;line-height:1.35;letter-spacing:.01em;white-space:nowrap;
  max-height:1.4em;overflow:hidden;transition:max-height .35s ease,opacity .35s ease}
.brand-tag{display:block;font:12px/1.35 var(--mono);color:var(--muted-2);white-space:nowrap}
/* Home page: the hero already shows the name in large type, so the top bar leaves
   it out until the hero has scrolled away. <html>.js-brand is set in <head>. */
.js-brand .brand-auto .brand-name{max-height:0;opacity:0}
.js-brand .site-header.past-hero .brand-auto .brand-name{max-height:1.4em;opacity:1}
@media (prefers-reduced-motion:reduce){
  .brand .mark,.brand-name{transition:none}
  .brand:hover .mark,.brand:focus-visible .mark{transform:none}
}
.nav-links{display:flex;align-items:center;gap:2px;flex-wrap:wrap;justify-content:flex-end}
.nav-links a{
  color:var(--muted);font:500 12.5px/1 var(--mono);letter-spacing:.04em;text-transform:uppercase;
  padding:9px 10px;border:1px solid transparent;
}
.nav-links a:hover,.nav-links a[aria-current="page"]{color:var(--text);border-color:var(--line);background:rgba(255,255,255,.03);text-decoration:none}
.nav-links a.nav-cta{color:var(--text);border-color:var(--line-2)}

/* ---------------------------------------------------------------- shared bits */
.kicker{
  display:inline-flex;align-items:center;gap:10px;
  font:500 12px/1.2 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--accent);
}
.kicker::before{
  content:"";width:9px;height:9px;flex:none;background:var(--accent);
  clip-path:polygon(50% 0,100% 50%,50% 100%,0 50%);
}
.muted{color:var(--muted)}
.mono{font-family:var(--mono)}

/* Chamfered panel: the outer box is the border colour, ::before is the fill,
   both cut with the same polygon so the bevel keeps its 1px edge. */
.facet{
  --c:var(--chamfer);
  position:relative;isolation:isolate;
  background:var(--line-2);
  clip-path:polygon(var(--c) 0,100% 0,100% calc(100% - var(--c)),calc(100% - var(--c)) 100%,0 100%,0 var(--c));
}
.facet::before{
  content:"";position:absolute;inset:1px;z-index:-1;
  background:
    linear-gradient(155deg, rgba(255,255,255,.045) 0, transparent 38%),
    linear-gradient(180deg, var(--panel-2), var(--panel));
  clip-path:polygon(calc(var(--c) - .4px) 0,100% 0,100% calc(100% - var(--c) + .4px),calc(100% - var(--c) + .4px) 100%,0 100%,0 calc(var(--c) - .4px));
}

.btn{
  --c:8px;
  display:inline-flex;align-items:center;gap:8px;min-height:42px;padding:10px 16px;
  font:500 13px/1 var(--mono);letter-spacing:.04em;text-transform:uppercase;
  color:var(--text);text-decoration:none;cursor:pointer;border:0;
  background:var(--line-2);position:relative;isolation:isolate;
  clip-path:polygon(var(--c) 0,100% 0,100% calc(100% - var(--c)),calc(100% - var(--c)) 100%,0 100%,0 var(--c));
  transition:background-color .15s ease;
}
.btn::before{
  content:"";position:absolute;inset:1px;z-index:-1;background:var(--panel);
  clip-path:inherit;
  transition:background-color .15s ease;
}
.btn:hover{text-decoration:none;color:var(--text);background:rgba(255,255,255,.34)}
.btn:hover::before{background:var(--panel-3)}
.btn.primary{background:var(--accent);color:#16130d}
.btn.primary::before{background:linear-gradient(180deg,#dccaa6,#c2ab81)}
.btn.primary:hover{background:#efe0c2}
.btn.primary:hover::before{background:linear-gradient(180deg,#e7d7b6,#cdb892)}
.btn svg{width:15px;height:15px;flex:none}

.tag{
  display:inline-block;padding:3px 8px;
  font:12px/1.4 var(--mono);color:var(--text-2);
  border:1px solid var(--line);background:rgba(255,255,255,.025);
}

/* ---------------------------------------------------------------- hero */
.hero{
  display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);
  gap:clamp(28px,5vw,64px);align-items:start;
  padding-block:clamp(22px,2.6vw,36px) clamp(24px,3vw,40px);
}
.hero h1{font-size:clamp(2.6rem,6.2vw,4.6rem);line-height:1;margin:0;letter-spacing:-.025em}
.hero .lede{font-size:clamp(1.08rem,1.6vw,1.25rem);color:var(--text-2);margin:22px 0 0;max-width:36em}
.hero .lede strong{color:var(--text);font-weight:600}
.cta{display:flex;flex-wrap:wrap;gap:8px;margin-top:28px}
.cta .btn{padding-inline:13px}
.facts{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  margin-top:34px;border-top:1px solid var(--line);
}
/* "$ fortune": one dry line right under the top bar, like a login message. It has the full
   page width, so on a laptop every line fits on one row; narrower screens reserve more rows
   (see the media queries) so a long line never pushes the page down. */
.fortune-bar{padding-top:18px}
.fortune{
  display:flex;align-items:flex-start;gap:12px;margin:0;min-height:1.45em;
  font:13px/1.45 var(--mono);color:var(--text-2);
}
.fortune-prompt{flex:none;color:var(--accent)}
.fortune-text{flex:0 1 auto}
.fortune-next{
  flex:none;display:grid;place-items:center;width:26px;height:22px;margin-top:-2px;padding:0;
  color:var(--muted);background:transparent;border:1px solid var(--line);cursor:pointer;
  transition:color .15s ease,border-color .15s ease;
}
.fortune-next:hover{color:var(--accent);border-color:var(--line-2)}
.fortune-next svg{width:14px;height:14px;transition:transform .4s ease}
@media (prefers-reduced-motion:reduce){.fortune-next svg{transition:none}}
.fact{padding:16px 14px 0 0}
.fact b{display:block;font-size:1.35rem;font-weight:600;line-height:1.1;color:var(--text)}
.fact span{display:block;margin-top:6px;font:12px/1.35 var(--mono);color:var(--muted);letter-spacing:.02em}

.latest{padding:10px}
.latest-head{display:flex;justify-content:space-between;align-items:baseline;gap:12px;margin-bottom:10px}
.latest-head .date{font:12px var(--mono);color:var(--muted-2)}
.latest-body{padding:14px 6px 6px}
.latest-body h2{font-size:1.15rem;line-height:1.3}
.latest-body p{margin:8px 0 0;color:var(--text-2);font-size:.95rem}
.latest-body .links{margin-top:12px}

/* ---------------------------------------------------------------- video (lite embed) */
.video{
  position:relative;display:block;width:100%;aspect-ratio:16/9;overflow:hidden;
  background:#0a0b0c;color:var(--text);cursor:pointer;border:0;padding:0;
}
/* Thumbnails are made to shout on YouTube; here they rest muted and wake on hover. */
.video img{width:100%;height:100%;object-fit:cover;filter:saturate(.62) brightness(.86);transition:filter .25s ease,transform .4s ease}
.video:hover img,.video:focus-visible img{filter:none;transform:scale(1.015)}
.video .play{
  position:absolute;left:50%;top:50%;width:68px;height:60px;transform:translate(-50%,-50%);
  background:rgba(12,13,14,.82);
  clip-path:polygon(12px 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%,0 12px);
  display:grid;place-items:center;transition:background-color .15s ease;
}
.video .play::after{
  content:"";width:0;height:0;margin-left:5px;
  border-left:17px solid var(--text);border-top:11px solid transparent;border-bottom:11px solid transparent;
}
.video:hover .play{background:rgba(205,184,146,.92)}
.video:hover .play::after{border-left-color:#16130d}
.video .dur{
  position:absolute;right:8px;bottom:8px;padding:2px 6px;
  font:12px/1.4 var(--mono);background:rgba(10,11,12,.85);color:var(--text-2);
}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.video.is-playing{cursor:default}

/* ---------------------------------------------------------------- sections */
.section{padding-block:clamp(48px,7vw,88px)}
.section-head{
  display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.9fr);gap:12px 40px;align-items:end;
  padding-top:22px;margin-bottom:30px;border-top:1px solid var(--line);
}
.section-head h2{font-size:clamp(1.8rem,3.4vw,2.6rem);margin-top:12px;letter-spacing:-.02em}
.section-head p{margin:0;color:var(--muted);max-width:34em}

/* filters */
.filters{display:flex;flex-wrap:wrap;gap:6px;margin:-6px 0 22px}
.chip{
  padding:7px 12px;font:500 12px/1 var(--mono);letter-spacing:.05em;text-transform:uppercase;
  color:var(--muted);background:transparent;border:1px solid var(--line);cursor:pointer;
}
.chip:hover{color:var(--text);border-color:var(--line-2)}
.chip[aria-pressed="true"]{color:#16130d;background:var(--accent);border-color:var(--accent)}

/* project cards */
.work-grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:18px}
.card{grid-column:span 4;display:flex;flex-direction:column}
.card.wide{grid-column:span 6}
.card[hidden]{display:none}
.card-media{margin:1px 1px 0;border-bottom:1px solid var(--line)}
.card-media .shot{width:100%;height:auto;aspect-ratio:16/9;object-fit:cover;background:#0a0b0c;filter:saturate(.7) brightness(.9);transition:filter .25s ease}
.card:hover .shot{filter:none}
.card-body{padding:18px 18px 20px;display:flex;flex-direction:column;flex:1}
.card-meta{display:flex;flex-wrap:wrap;gap:6px 12px;align-items:center;font:12px/1.4 var(--mono);color:var(--muted-2);letter-spacing:.03em;text-transform:uppercase}
.card-meta .kind{color:var(--accent)}
.card h3{font-size:1.2rem;margin:10px 0 0;line-height:1.25}
.card.wide h3{font-size:1.4rem}
.card p{margin:10px 0 0;color:var(--text-2);font-size:.95rem}
.card .found{margin-top:12px;padding:10px 12px;border-left:2px solid var(--accent);background:var(--accent-dim);color:var(--text);font-size:.93rem}
.card .found b{font:500 11px/1 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--accent);display:block;margin-bottom:6px}
.card .tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:14px}
.links{display:flex;flex-wrap:wrap;gap:6px 16px;margin-top:auto;padding-top:14px;font:500 12.5px/1.4 var(--mono);letter-spacing:.04em;text-transform:uppercase}
.links a{color:var(--text-2)}
.links a:hover{color:var(--accent);text-decoration:none}
.links a::after{content:" ↗";color:var(--muted-2)}
.links a[href^="/"]::after,.links a[href^="#"]::after{content:" →"}

/* ---------------------------------------------------------------- research */
.papers{display:grid;gap:14px}
.paper{display:grid;grid-template-columns:260px minmax(0,1fr);gap:20px 28px;padding:18px}
.paper-side img{width:100%;height:auto;aspect-ratio:16/9;object-fit:cover;background:#0a0b0c;border:1px solid var(--line)}
.paper-when{margin-top:12px;font:12px/1.5 var(--mono);color:var(--muted);letter-spacing:.02em}
.paper-when b{display:block;font-size:1.05rem;color:var(--text);font-weight:500;letter-spacing:0}
.paper-body{padding:2px 4px 2px 0;display:flex;flex-direction:column}
.paper h3{font-size:1.1rem;line-height:1.35}
.paper h3 a{color:var(--text)}
.paper h3 a:hover{color:var(--accent)}
.paper .role{margin:6px 0 0;font:12px/1.4 var(--mono);color:var(--muted)}
.plain{margin:12px 0 0;color:var(--text-2)}
.plain::before{
  content:"In plain English";display:block;margin-bottom:5px;
  font:500 11px/1 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--accent);
}

/* talks and demos, under the papers */
.talks{padding:18px 22px}
.talks h3{font:500 12px/1.2 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--accent);margin-bottom:10px}
.talks ul{list-style:none}
.talks li{display:grid;grid-template-columns:56px minmax(0,1.2fr) minmax(0,1fr);gap:4px 16px;padding:9px 0;border-top:1px solid var(--line);font-size:.95rem}
.talks li b{font:500 13px/1.6 var(--mono);color:var(--text)}
.talks li span{color:var(--text)}
.talks li em{font-style:normal;color:var(--muted)}

/* ---------------------------------------------------------------- videos / archive */
.vid-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.vid{display:flex;flex-direction:column}
.vid .card-body{padding:12px 14px 14px}
.vid h3{font-size:.98rem;line-height:1.3;margin:0}
.vid .card-meta{margin-top:6px}
/* Older videos: collapsed behind one wide, obvious button */
.more > summary{list-style:none}
.more > summary::-webkit-details-marker{display:none}
.more-toggle{
  --c:10px;
  display:flex;align-items:center;justify-content:center;gap:12px;min-height:56px;padding:12px 18px;
  font:500 13px/1 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--text);
  cursor:pointer;user-select:none;position:relative;isolation:isolate;background:var(--line-2);
  clip-path:polygon(var(--c) 0,100% 0,100% calc(100% - var(--c)),calc(100% - var(--c)) 100%,0 100%,0 var(--c));
  transition:background-color .15s ease;
}
.more-toggle::before{
  content:"";position:absolute;inset:1px;z-index:-1;
  background:linear-gradient(155deg,rgba(255,255,255,.045) 0,transparent 40%),linear-gradient(180deg,var(--panel-2),var(--panel));
  clip-path:inherit;transition:background .15s ease;
}
.more-toggle:hover{background:var(--accent)}
.more-toggle:hover::before{background:linear-gradient(180deg,var(--panel-3),var(--panel-2))}
.more-toggle:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.more-toggle .chev{width:18px;height:18px;color:var(--accent);transition:transform .2s ease}
.more[open] .more-toggle .chev{transform:rotate(180deg)}
.more .when-open,.more[open] .when-closed{display:none}
.more[open] .when-open{display:inline}
.more[open] > .more-toggle{margin-bottom:18px}

/* ---------------------------------------------------------------- experience */
.xp-list{list-style:none;padding:4px 22px}
.xp-list li{display:grid;grid-template-columns:120px minmax(0,1.15fr) minmax(0,1fr);gap:4px 24px;align-items:baseline;padding:15px 0;border-top:1px solid var(--line)}
.xp-list li:first-child{border-top:0}
.xp-when{font:12.5px/1.5 var(--mono);letter-spacing:.03em;color:var(--muted)}
.xp-role{color:var(--text-2)}
.xp-role b{color:var(--text);font-weight:600}
.xp-what{color:var(--muted);font-size:.95rem}
.xp-foot{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px 28px;margin-top:20px}
.xp-edu{margin:0;color:var(--text-2);font-size:.95rem;max-width:48em}
.xp-edu span + span::before{content:" · ";color:var(--muted-2)}

/* ---------------------------------------------------------------- about */
.about{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);gap:clamp(24px,4vw,56px);align-items:start}
.about-text p{color:var(--text-2);font-size:1.05rem;max-width:38em}
.about-text p:first-child{color:var(--text);font-size:1.2rem}
.about-list{padding:20px 22px}
.about-list h3{font:500 12px/1.2 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--accent);margin-bottom:12px}
.about-list ul{list-style:none;display:grid;gap:10px}
.about-list li{display:grid;grid-template-columns:120px minmax(0,1fr);gap:12px;font-size:.95rem;color:var(--text-2)}
.about-list li b{font:500 12px/1.6 var(--mono);color:var(--muted);letter-spacing:.04em;text-transform:uppercase;font-weight:500}

/* ---------------------------------------------------------------- repos page */
.page-head{padding-block:clamp(44px,7vw,80px) 10px}
.page-head h1{font-size:clamp(2.2rem,5vw,3.6rem);margin-top:14px;letter-spacing:-.02em}
.page-head p{margin-top:16px;color:var(--text-2);max-width:40em;font-size:1.08rem}
.repo-groups{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;align-items:start}
.repo-group.slim{grid-column:1 / -1;display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:6px 24px}
.repo-group.slim header{gap:18px;justify-content:flex-start}
.repo-group.slim > p{margin:0;flex:1 1 20em}
.repo-group{padding:20px 22px}
.repo-group header{display:flex;justify-content:space-between;align-items:baseline;gap:12px;flex-wrap:wrap}
.repo-group h2{font-size:1.25rem}
.repo-group header a{font:500 12px var(--mono);text-transform:uppercase;letter-spacing:.05em}
.repo-group > p{color:var(--muted);margin:8px 0 0;font-size:.93rem}
.repo-list{list-style:none;margin-top:14px;display:grid;gap:0}
.repo-list li{display:grid;grid-template-columns:minmax(0,190px) minmax(0,1fr);gap:14px;padding:9px 0;border-top:1px solid var(--line);font-size:.94rem}
.repo-list li a{font:500 13.5px/1.5 var(--mono);color:var(--text)}
.repo-list li a:hover{color:var(--accent)}
.repo-list li span{color:var(--muted)}

/* ---------------------------------------------------------------- footer */
.site-footer{margin-top:40px;border-top:1px solid var(--line);background:rgba(12,13,14,.88)}
.foot{display:flex;flex-wrap:wrap;justify-content:space-between;gap:18px 30px;padding-block:28px 34px;font-size:.9rem;color:var(--muted)}
.foot nav{display:flex;flex-wrap:wrap;gap:6px 18px;font:500 12.5px/1.6 var(--mono);text-transform:uppercase;letter-spacing:.04em}
.foot nav a{color:var(--text-2)}
.foot small{display:block;margin-top:6px;color:var(--muted-2);font-size:.8rem}

/* ---------------------------------------------------------------- sound toggle */
.sound{
  position:fixed;z-index:40;
  right:calc(14px + env(safe-area-inset-right,0px));bottom:calc(14px + env(safe-area-inset-bottom,0px));
  display:inline-flex;align-items:center;gap:8px;height:36px;padding:0 12px 0 10px;
  font:500 11.5px/1 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--muted);
  background:rgba(16,18,20,.92);border:1px solid var(--line-2);cursor:pointer;
  clip-path:polygon(8px 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%,0 8px);
}
.sound:hover{color:var(--text)}
.sound svg{width:16px;height:16px}
.sound .on{display:none}
.sound[aria-pressed="true"]{color:var(--accent)}
.sound[aria-pressed="true"].is-waiting{color:var(--text-2)}
.sound[aria-pressed="true"] .on{display:block}
.sound[aria-pressed="true"] .off{display:none}
.sound .bars{display:none;gap:2px;align-items:flex-end;height:12px}
.sound .bars i{display:block;width:2px;background:currentColor;height:4px}
.sound[aria-pressed="true"].is-live .bars{display:inline-flex}
.sound[aria-pressed="true"].is-live .bars i{animation:bar 1.2s ease-in-out infinite}
.sound .bars i:nth-child(2){animation-delay:-.4s!important}
.sound .bars i:nth-child(3){animation-delay:-.8s!important}
@keyframes bar{0%,100%{height:3px}50%{height:12px}}
@media (prefers-reduced-motion:reduce){.sound .bars i{animation:none!important;height:8px}}

/* ---------------------------------------------------------------- reveal */
/* Content is visible by default; JS adds .js-reveal to <html> only when it can
   also remove it, so nothing stays hidden if a script fails. */
.js-reveal .reveal{opacity:0;transform:translateY(14px);transition:opacity .6s ease,transform .6s ease}
.js-reveal .reveal.is-in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.js-reveal .reveal{opacity:1;transform:none;transition:none}}

/* ---------------------------------------------------------------- responsive */
@media (max-width:1020px){
  .hero{grid-template-columns:1fr}
  .card,.card.wide{grid-column:span 6}
  .vid-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .about{grid-template-columns:1fr}
  .xp-list li{grid-template-columns:110px minmax(0,1fr)}
  .xp-what{grid-column:2}
  .section-head{grid-template-columns:1fr}
}
@media (max-width:760px){
  .brand-tag{display:none}
  .nav{min-height:56px}
  .nav-links a{padding:8px 7px;font-size:11.5px}
  .card,.card.wide{grid-column:1 / -1}
  .facts{grid-template-columns:repeat(2,minmax(0,1fr))}
  .paper{grid-template-columns:1fr}
  .paper-side{display:grid;grid-template-columns:120px minmax(0,1fr);gap:14px;align-items:center}
  .paper-when{margin-top:0}
  .repo-groups{grid-template-columns:1fr}
  .repo-list li{grid-template-columns:1fr;gap:2px}
  .talks li{grid-template-columns:48px minmax(0,1fr)}
  .xp-list li{grid-template-columns:1fr;gap:2px}
  .xp-what{grid-column:auto}
  .xp-edu span{display:block}
  .xp-edu span + span::before{content:none}
  .talks li em{grid-column:2}
  .about-list li{grid-template-columns:1fr;gap:2px}
}
@media (max-width:560px){
  .brand-name{display:none}
  .nav-links .opt{display:none}
  .vid-grid{grid-template-columns:1fr}
  .sound .label{display:none}
  .sound{padding:0 10px}
}
/* rows reserved for the fortune line as the page narrows, so cycling lines never moves the page */
@media (max-width:760px){ .fortune{min-height:2.9em} }
@media (max-width:480px){ .fortune{min-height:4.35em} }
@media (max-width:380px){   /* tiny phones: prompt and button share the first row, the text gets the full width below */
  .fortune{min-height:6.3em;flex-wrap:wrap;row-gap:2px}
  .fortune-prompt{flex:1 1 auto}
  .fortune-next{order:1}
  .fortune-text{order:2;flex-basis:100%}
}
@media print{
  #bg,.bg-shade,.sound,.site-header{display:none}
  body{background:#fff;color:#000}
}