:root{
  --navy:#000014; --surface-1:#0C0C57; --surface-2:#14145F; --surface-3:#1B1B6B;
  --border:#2E2E73; --border-soft:#23235f;
  --text:#EDEEF6; --muted:#c2ebff; --muted-2:#80D5FE;
  --accent:#0191d6; --accent-ink:#00103a; --signal:#ffffff; --signal-ink:#00103a;
  --maxw:1140px; --gutter:clamp(1.25rem,5vw,3rem);
  --r-sm:8px; --r:12px; --r-lg:18px;
  --font-sans:"Geist",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --font-mono:var(--font-sans);
  --step--1:clamp(1rem,.98rem + .12vw,1.05rem);
  --step-0:clamp(1rem,.96rem + .2vw,1.12rem);
  --step-1:clamp(1.2rem,1.1rem + .45vw,1.5rem);
  --step-2:clamp(1.5rem,1.32rem + .9vw,2.1rem);
  --step-3:clamp(1.9rem,1.6rem + 1.6vw,3rem);
  --step-4:clamp(2.4rem,1.9rem + 2.7vw,4.4rem);
  --ease:cubic-bezier(.22,.61,.36,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
html{text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{
  margin:0;background:var(--navy);color:var(--text);
  font-family:var(--font-sans);font-size:var(--step-0);line-height:1.65;
  font-feature-settings:"ss01","cv01";-webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;overflow-x:hidden;
}
/* atmosphere */
body::before{
  content:"";position:fixed;inset:0;z-index:-2;pointer-events:none;
  background:
    radial-gradient(60rem 40rem at 78% -10%,rgba(110, 168, 254, 0.16),transparent 60%),
    radial-gradient(48rem 36rem at 5% 8%,rgba(61, 125, 220, 0.08),transparent 55%),
    radial-gradient(90rem 80rem at 50% 120%,var(--surface-1),transparent 60%);
}
body::after{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.5;
  background-image:linear-gradient(rgba(110,168,254,.05) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(110,168,254,.05) 1px,transparent 1px);
  background-size:64px 64px;
  -webkit-mask-image:radial-gradient(circle at 50% 0,#000,transparent 75%);
          mask-image:radial-gradient(circle at 50% 0,#000,transparent 75%);
}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-underline-offset:3px;text-decoration-thickness:1px}
a:hover{text-decoration-color:var(--text)}
h1,h2,h3,h4{line-height:1.1;letter-spacing:-.02em;font-weight:600;margin:0 0 .5em}
p{margin:0 0 1rem}
strong{color:#fff;font-weight:600}
:focus-visible{outline:3px solid var(--accent);outline-offset:3px;border-radius:6px}
::selection{background:var(--accent);color:var(--accent-ink)}

.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
.eyebrow{font-family:var(--font-mono);font-size:var(--step--1);letter-spacing:.14em;
  text-transform:uppercase;color:var(--muted);margin:0 0 1rem;display:flex;gap:.6rem;align-items:center}
.eyebrow::before{content:"";width:1.6rem;height:1px;background:var(--accent)}
.muted{color:var(--muted)}
.center{text-align:center}
.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* skip link */
.skip{position:fixed;top:.7rem;left:.7rem;z-index:200;transform:translateY(-160%);
  background:var(--accent);color:var(--accent-ink);font-weight:600;
  padding:.65rem 1rem;border-radius:var(--r-sm);transition:transform .2s var(--ease);text-decoration:none}
.skip:focus{transform:translateY(0)}

/* header */
.site-header{position:sticky;top:0;z-index:100;background:rgba(0,0,40,.72);
  backdrop-filter:saturate(140%) blur(12px);-webkit-backdrop-filter:saturate(140%) blur(12px);
  border-bottom:1px solid var(--border-soft)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:1rem;min-height:68px}
.brand{display:inline-flex;align-items:center;gap:.65rem;font-weight:600;color:var(--text);
  text-decoration:none;letter-spacing:-.01em}
.brand .mark{width:34px;height:34px;border-radius:9px;display:grid;place-items:center;
  font-family:var(--font-mono);font-size:var(--step--1);font-weight:600;color: var(--accent-ink);
  background:linear-gradient(135deg,var(--signal),var(--accent));box-shadow:0 0 0 1px rgba(255,255,255,.12) inset}
.brand .who{display:flex;flex-direction:column;line-height:1.05}
.brand .who small{font-family:var(--font-mono);font-size:var(--step--1);letter-spacing:.16em;
  text-transform:uppercase;color:var(--muted)}
.nav-links{display:flex;align-items:center;gap:.4rem;list-style:none;margin:0;padding:0}
.nav-links a{display:inline-block;padding:.5rem .8rem;border-radius:var(--r-sm);color:var(--muted);
  text-decoration:none;font-size:var(--step--1);font-weight:500;letter-spacing:.01em}
.nav-links a:hover{color:var(--text);background:var(--surface-1)}
.nav-links a[aria-current="page"]{color:var(--text);background:var(--surface-2)}
.nav-cta{margin-left:.4rem}
.nav-toggle{display:none;align-items:center;gap:.5rem;background:var(--surface-1);
  color:var(--text);border:1px solid var(--border);border-radius:var(--r-sm);
  padding:.5rem .75rem;font:inherit;font-size:var(--step--1);cursor:pointer}
.nav-toggle .bars{width:18px;height:12px;position:relative;display:inline-block}
.nav-toggle .bars::before,.nav-toggle .bars::after,.nav-toggle .bars span{
  content:"";position:absolute;left:0;right:0;height:2px;background:currentColor;border-radius:2px}
.nav-toggle .bars::before{top:0}.nav-toggle .bars span{top:5px}.nav-toggle .bars::after{top:10px}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:.5rem;font:inherit;font-weight:600;
  font-size:var(--step--1);padding:.7rem 1.15rem;border-radius:var(--r-sm);
  text-decoration:none;cursor:pointer;border:1px solid transparent;transition:transform .15s var(--ease),background .15s,border-color .15s,box-shadow .15s}
.btn-primary{background:var(--accent);color:var(--accent-ink);box-shadow:0 8px 24px -12px rgba(110,168,254,.8)}
.btn-primary:hover{background:var(--muted-2);transform:translateY(-1px)}
.btn-ghost{background:transparent;color:var(--text);border-color:var(--border)}
.btn-ghost:hover{border-color:var(--accent);background:var(--surface-1);transform:translateY(-1px)}
.btn .arr{transition:transform .15s var(--ease)}
.btn:hover .arr{transform:translateX(3px)}

/* chips & tags */
.chip{display:inline-flex;align-items:center;gap:.45rem;font-family:var(--font-mono);
  font-size:var(--step--1);letter-spacing:.04em;padding:.28rem .6rem;border-radius:999px;
  border:1px solid var(--border);color:var(--muted);background:var(--surface-1);white-space:nowrap}
.chip .dot{width:7px;height:7px;border-radius:50%;background:var(--muted)}
.chip.live .dot{background:var(--signal);box-shadow:0 0 0 3px rgba(64, 61, 220, 0.18)}
.chip.wip .dot{background:var(--accent);box-shadow:0 0 0 3px rgba(110,168,254,.18)}
.chip.done .dot{background:var(--muted-2)}
.tags{display:flex;flex-wrap:wrap;gap:.4rem;list-style:none;margin:0;padding:0}
.tag{font-family:var(--font-mono);font-size:var(--step--1);letter-spacing:.05em;color:var(--accent);
  font-style: italic; text-transform:uppercase}

/* sections */
.section{padding-block:clamp(3.5rem,7vw,6rem)}
.section-head{max-width:62ch;margin-bottom:2.5rem}
.section-head h2{font-size:var(--step-3)}
.rule{height:1px;background:linear-gradient(90deg,var(--border),transparent);border:0;margin:0}

/* hero */
.hero{position:relative;padding-block:clamp(3.5rem,10vw,7.5rem) clamp(2.5rem,6vw,4.5rem)}
.hero h1{font-size:var(--step-4);max-width:18ch;margin-bottom:1.25rem;letter-spacing:-.03em}
.hero h1 .hl{color:var(--accent)}
.hero .lede{font-size:var(--step-1);color:var(--muted);max-width:60ch;line-height:1.5;margin-bottom:2rem}
.hero .actions{display:flex;flex-wrap:wrap;gap:.8rem;margin-bottom:2.5rem}
.cred{display:flex;flex-wrap:wrap;gap:.5rem .55rem;list-style:none;margin:0;padding:0}
.cred li{font-family:var(--font-mono);font-size:var(--step--1);color:var(--muted);
  font-style: italic;}
.cred li b{color:var(--signal);font-weight:500}

/* grids */
.grid{display:grid;gap:1.1rem}
@media(min-width:640px){.grid.cols-2{grid-template-columns:1fr 1fr}}
@media(min-width:880px){.grid.cols-3{grid-template-columns:repeat(3,1fr)}
  .grid.cols-2-lg{grid-template-columns:1fr 1fr}}

/* card */
.card{position:relative;display:flex;flex-direction:column;gap:.85rem;background:var(--surface-1);
  border:1px solid var(--border-soft);border-radius:var(--r-lg);padding:1.4rem;
  transition:transform .18s var(--ease),border-color .18s,background .18s,box-shadow .18s}
.card:hover{border-color:var(--border);transform:translateY(-3px);
  box-shadow:0 24px 50px -30px rgba(0,0,0,.8);background:var(--surface-2)}
.card .num{font-family:var(--font-mono);font-size:var(--step--1);color:var(--muted-2);letter-spacing:.1em}
.card h3{font-size:var(--step-1);margin:0}
.card h3 a{color:var(--text);text-decoration:none}
.card h3 a::after{content:"";position:absolute;inset:0}
.card:hover h3 a{color:#fff}
.card .cats{font-family:var(--font-mono);font-size:var(--step--1);color:var(--accent);letter-spacing:.02em}
.card .desc{color:var(--muted);margin:0;font-size:var(--step--1);line-height:1.6}
.card .meta-row{display:flex;align-items:center;justify-content:space-between;gap:1rem;
  margin-top:auto;padding-top:.4rem}
.card .metric{font-family:var(--font-mono);font-size:var(--step--1);color:var(--text)}
.card .go{font-family:var(--font-mono);font-size:var(--step--1);color:var(--accent);display:inline-flex;
  align-items:center;gap:.35rem;position:relative;z-index:1}
.card:hover .go .arr{transform:translateX(3px)}

.card.feature{padding:0;overflow:hidden}
.cover{aspect-ratio:16/7;position:relative;display:grid;place-items:start end;padding:1rem;
  background:
    radial-gradient(120% 140% at 0% 0%,rgba(110,168,254,.35),transparent 55%),
    radial-gradient(120% 140% at 100% 100%,rgba(61, 72, 220, 0.22),transparent 55%),
    linear-gradient(135deg,var(--surface-2),var(--surface-3));
  border-bottom:1px solid var(--border)}
.cover::before{content:"";position:absolute;inset:0;opacity:.5;
  background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:28px 28px;
  -webkit-mask-image:linear-gradient(135deg,#000,transparent 70%);mask-image:linear-gradient(135deg,#000,transparent 70%)}
.cover .glyph{position:absolute;left:1rem;bottom:.85rem;font-family:var(--font-mono);
  font-size:var(--step--1);color:var(--text);letter-spacing:.08em;opacity:.9}
.cover .corner{font-family:var(--font-mono);font-size:var(--step--1);color:var(--accent-ink);
  background:var(--accent);border-radius:999px;padding:.2rem .6rem;font-weight:600}
.card.feature .body{padding:1.4rem;display:flex;flex-direction:column;gap:.8rem}

/* pillars */
.pillar{background:linear-gradient(180deg,var(--surface-1),rgba(12,12,87,.4));
  border:1px solid var(--border-soft);border-radius:var(--r-lg);padding:1.6rem}
.pillar .pid{font-family:var(--font-mono);font-size:var(--step--1);color:var(--accent);letter-spacing:.12em}
.pillar h3{font-size:var(--step-1);margin:.6rem 0 .5rem}
.pillar p{color:var(--muted);font-size:var(--step--1);margin:0}

/* quotes */
.quote{background:var(--surface-1);border:1px solid var(--border-soft);border-radius:var(--r-lg);
  padding:1.6rem;display:flex;flex-direction:column;gap:1rem}
.quote blockquote{margin:0;font-size:var(--step-0);color:var(--text);line-height:1.6}
.quote blockquote::before{content:"\201C";font-family:var(--font-mono);color:var(--accent);
  font-size:2.4rem;line-height:0;vertical-align:-.4em;margin-right:.15em}
.quote .who{display:flex;flex-direction:column;font-size:var(--step--1)}
.quote .who b{color:#fff}
.quote .who span{color:var(--muted-2);font-family:var(--font-mono);font-size:var(--step--1)}

/* case study */
.cs-hero{padding-block:clamp(2.5rem,6vw,4rem) 1.5rem}
.cs-hero .back{font-family:var(--font-mono);font-size:var(--step--1);color:var(--muted);
  text-decoration:none;display:inline-flex;gap:.4rem;align-items:center;margin-bottom:1.5rem}
.cs-hero .back:hover{color:var(--accent)}
.cs-hero h1{font-size:var(--step-3);max-width:24ch;margin-bottom:1rem}
.cs-hero .cats{font-family:var(--font-mono);font-size:var(--step--1);color:var(--accent);
  letter-spacing:.04em;margin-bottom:1rem}
.cs-hero .summary{font-size:var(--step-1);color:var(--muted);max-width:60ch;line-height:1.5}
.cs-meta{display:flex;flex-wrap:wrap;gap:.6rem;margin:1.4rem 0}
.cs-cover{margin:2rem 0;border-radius:var(--r-lg);overflow:hidden;border:1px solid var(--border)}
.cs-cover .cover{aspect-ratio:16/6}
.cs-grid{display:grid;gap:2.5rem}
@media(min-width:900px){.cs-grid{grid-template-columns:minmax(0,1fr) 17rem}}
.prose h2{font-size:var(--step-2);margin:2.2rem 0 .8rem}
.prose h2:first-child{margin-top:0}
.prose h3{font-size:var(--step-1);color:var(--text);margin:1.6rem 0 .6rem}
.prose p{color:var(--muted);max-width:68ch}
.prose ul{color:var(--muted);max-width:68ch;padding-left:1.1rem;margin:0 0 1.2rem}
.prose li{margin-bottom:.5rem}
.prose li::marker{color:var(--accent)}
.callout{background:linear-gradient(135deg,var(--surface-2),var(--surface-1));
  border:1px solid var(--border);border-left:3px solid var(--accent);border-radius:var(--r);
  padding:1.1rem 1.25rem;margin:1.5rem 0;font-family:var(--font-mono);font-size:var(--step--1);color:var(--text)}
.sidebar{display:flex;flex-direction:column;gap:1.4rem;align-self:start;position:sticky;top:90px}
.panel{background:var(--surface-1);border:1px solid var(--border-soft);border-radius:var(--r);padding:1.1rem 1.2rem}
.panel h4{font-family:var(--font-mono);font-size:var(--step--1);letter-spacing:.14em;text-transform:uppercase;
  color:var(--muted);margin:0 0 .7rem;font-weight:500}
.panel ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.45rem}
.panel li{font-size:var(--step--1);color:var(--text)}
.taglist{display:flex;flex-wrap:wrap;gap:.4rem}
@media(max-width:899px){.sidebar{position:static}}

/* about */
.bio-lede{font-size:var(--step-2);line-height:1.35;max-width:24ch;color:var(--text);letter-spacing:-.02em}
.about-grid{display:grid;gap:2.5rem}
@media(min-width:900px){.about-grid{grid-template-columns:1.4fr 1fr}}
.timeline{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:1.2rem}
.timeline li{border-left:2px solid var(--border);padding-left:1rem}
.timeline .role{font-weight:600;color:#fff}
.timeline .org{color:var(--muted);font-size:var(--step--1)}
.timeline .when{font-family:var(--font-mono);font-size:var(--step--1);color:var(--accent);letter-spacing:.05em}
.cert-group{margin-bottom:1.8rem}
.cert-group h4{font-family:var(--font-mono);font-size:var(--step--1);letter-spacing:.12em;text-transform:uppercase;
  color:var(--accent);margin:0 0 .8rem}
.cert-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.55rem}
.cert-list li{display:flex;gap:.7rem;align-items:baseline;font-size:var(--step--1);color:var(--text)}
.cert-list li::before{content:"\2713";color:var(--signal);font-family:var(--font-mono);flex:none}
.cert-list .src{color:var(--muted-2);font-family:var(--font-mono);font-size:var(--step--1)}
.skillwrap{display:flex;flex-wrap:wrap;gap:.5rem}
.skillwrap .tag{text-transform:none;font-size:var(--step--1)}
.award{background:linear-gradient(135deg,rgba(61, 64, 220, 0.1),var(--surface-1));
  border:1px solid var(--border);border-left:3px solid var(--accent);border-radius:var(--r);padding:1.2rem 1.3rem;margin-bottom:1.1rem}
.award b{color:#fff}

/* contact */
.contact-card{background:var(--surface-1);border:1px solid var(--border-soft);border-radius:var(--r-lg);
  padding:1.4rem 1.5rem;display:flex;flex-direction:column;gap:.4rem}
.contact-card .k{font-family:var(--font-mono);font-size:var(--step--1);letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.contact-card a,.contact-card .v{font-size:var(--step-0);color:var(--text);text-decoration:none;word-break:break-word}
.contact-card a:hover{color:var(--accent)}
form .field{display:flex;flex-direction:column;gap:.4rem;margin-bottom:1rem}
form label{font-family:var(--font-mono);font-size:var(--step--1);letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
form input,form textarea{font:inherit;color:var(--text);background:var(--navy);
  border:1px solid var(--border);border-radius:var(--r-sm);padding:.7rem .85rem}
form input:focus,form textarea:focus{border-color:var(--accent);outline:3px solid rgba(110,168,254,.35);outline-offset:1px}

/* filter bar */
.filters{display:flex;flex-wrap:wrap;gap:.5rem;margin-bottom:1.6rem}
.filter{font:inherit;font-family:var(--font-mono);font-size:var(--step--1);letter-spacing:.04em;cursor:pointer;
  color:var(--muted);background:var(--surface-1);border:1px solid var(--border);border-radius:999px;padding:.45rem .9rem}
.filter:hover{color:var(--text);border-color:var(--accent)}
.filter[aria-pressed="true"]{background:var(--accent);color:var(--accent-ink);border-color:var(--accent);font-weight:600}
.count{font-family:var(--font-mono);font-size:var(--step--1);color:var(--muted);margin-bottom:1.2rem}
.card.is-hidden{display:none}

/* footer */
.site-footer{border-top:1px solid var(--border-soft);margin-top:2rem;padding-block:3rem 2.5rem;
  background:linear-gradient(180deg,transparent,rgba(12,12,87,.4))}
.foot-grid{display:grid;gap:2rem}
@media(min-width:760px){.foot-grid{grid-template-columns:1.5fr 1fr 1fr}}
.foot-grid h4{font-family:var(--font-mono);font-size:var(--step--1);letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin:0 0 .9rem;font-weight:500}
.foot-grid ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.5rem}
.foot-grid a{color:var(--muted);text-decoration:none;font-size:var(--step--1)}
.foot-grid a:hover{color:var(--text)}
.foot-bottom{display:flex;flex-wrap:wrap;gap:.8rem;justify-content:space-between;align-items:center;
  margin-top:2.5rem;padding-top:1.5rem;border-top:1px solid var(--border-soft);
  font-family:var(--font-mono);font-size:var(--step--1);color:var(--muted-2)}
.foot-bottom .badge{display:inline-flex;align-items:center;gap:.45rem;color:var(--signal)}
.foot-bottom .badge .dot{width:7px;height:7px;border-radius:50%;background:var(--signal);box-shadow:0 0 0 3px rgba(64, 61, 220, 0.18)}

/* reveal (progressive, motion-safe) */
.js .reveal{opacity:0;transform:translateY(14px)}
.js .reveal.is-visible{opacity:1;transform:none;transition:opacity .6s var(--ease),transform .6s var(--ease)}
@media (prefers-reduced-motion:reduce){
  .js .reveal{opacity:1!important;transform:none!important;transition:none!important}
  *{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
}
/* hero staggered load (motion-safe only) */
@media (prefers-reduced-motion:no-preference){
  .js .hero .stg{opacity:0;animation:rise .7s var(--ease) forwards}
  .js .hero .stg:nth-child(1){animation-delay:.05s}
  .js .hero .stg:nth-child(2){animation-delay:.15s}
  .js .hero .stg:nth-child(3){animation-delay:.25s}
  .js .hero .stg:nth-child(4){animation-delay:.35s}
  .js .hero .stg:nth-child(5){animation-delay:.45s}
}
@keyframes rise{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}

/* mobile nav */
@media(max-width:820px){
  .nav-toggle{display:inline-flex}
  .nav-menu{position:absolute;left:0;right:0;top:100%;background:rgba(0,0,40,.97);
    backdrop-filter:blur(12px);border-bottom:1px solid var(--border);
    -webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border);
    padding:1rem var(--gutter) 1.4rem;display:none}
  .nav-menu.open{display:block}
  .nav-links{flex-direction:column;align-items:stretch;gap:.3rem}
  .nav-links a{padding:.8rem .9rem;font-size:var(--step-0)}
  .nav-cta{margin:.6rem 0 0}
  .nav-cta .btn{width:100%;justify-content:center}
}

/* real cover images */
.cover.has-img{padding:0}
.cover.has-img::before{display:none}
.cover.has-img>img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.cover.has-img .corner{position:absolute;top:1rem;right:1rem;z-index:2}

/* case-study figures */
.prose figure{margin:1.6rem 0;border:1px solid var(--border);border-radius:var(--r-lg);overflow:hidden;background:var(--surface-1)}
.prose figcaption{font-family:var(--font-mono);font-size:var(--step--1);color:var(--muted);padding:.6rem .9rem;border-top:1px solid var(--border-soft)}
/* tall/portrait screenshots: center and cap height so they never tower or hug an edge */
.prose figure.fig-portrait img{margin-inline:auto;max-height:680px;width:auto}
.figure-pair{display:grid;gap:1.2rem;margin:1.6rem 0}
@media(min-width:700px){.figure-pair{grid-template-columns:1fr 1fr}}
.figure-pair figure{margin:0}
.portrait{width:100%;height:auto;border-radius:var(--r-lg);border:1px solid var(--border);margin-bottom:1.2rem}

/* image lightbox */
.img-zoom{display:block;width:100%;padding:0;margin:0;border:0;background:none;cursor:zoom-in}
.img-zoom:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
.cover.has-img .img-zoom{position:absolute;inset:0}
.cover.has-img .img-zoom>img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.lightbox{border:0;padding:0;background:transparent;max-width:min(92vw,1400px);max-height:92vh;overflow:visible}
.lightbox::backdrop{background:rgba(4,4,30,.85);backdrop-filter:blur(4px)}
.lightbox img{max-width:min(92vw,1400px);max-height:80vh;width:auto;height:auto;margin:0 auto;border-radius:var(--r-lg);border:1px solid var(--border);background:var(--surface-1)}
.lightbox-cap{font-family:var(--font-mono);font-size:var(--step--1);color:#fff;text-align:center;margin:.8rem auto 0;max-width:70ch}
.lightbox-close{display:block;margin:0 0 .8rem auto;font:inherit;font-family:var(--font-mono);font-size:var(--step--1);color:#fff;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.35);border-radius:999px;padding:.35rem .9rem;cursor:pointer}
.lightbox-close:hover{background:rgba(255,255,255,.22)}
.lightbox-close:focus-visible{outline:3px solid var(--accent);outline-offset:2px}

/* course embeds */
.course-embed{margin:1.6rem 0;border:1px solid var(--border);border-radius:var(--r-lg);overflow:hidden;background:var(--surface-1)}
.course-embed iframe{display:block;width:100%;aspect-ratio:16/9;border:0}
/* embed placeholder: compact + dashed until a real OneDrive src is pasted (then reverts to 16/9) */
.course-embed iframe[src="about:blank"]{aspect-ratio:auto;height:8rem;background:var(--surface-2);border:2px dashed var(--border)}
/* embedded PDF documents (taller than 16:9 for readability) */
.course-embed.pdf iframe{aspect-ratio:auto;height:44rem;background:var(--surface-2)}
/* OneDrive/Office embeds — fill width at the viewer's native aspect ratio */
.course-embed.onedrive-w iframe{aspect-ratio:476/288;height:auto;background:#fff}
.course-embed.onedrive-p iframe{aspect-ratio:402/327;height:auto;background:#fff}

/* prompt / code block */
.prompt-block{margin:1.6rem 0;border:1px solid var(--border);border-radius:var(--r-lg);overflow:hidden;background:var(--navy)}
.prompt-block .ph{display:flex;align-items:center;gap:.55rem;padding:.6rem .9rem;background:var(--surface-1);
  border-bottom:1px solid var(--border-soft);font-family:var(--font-mono);font-size:var(--step--1);
  letter-spacing:.04em;color:var(--muted-2)}
.prompt-block .ph::before{content:"";width:9px;height:9px;border-radius:50%;background:var(--accent);flex:none}
.prompt-block pre{margin:0;padding:1rem 1.2rem;max-height:30rem;overflow:auto;white-space:pre-wrap;
  word-break:break-word;font-family:ui-monospace,Menlo,Consolas,"Courier New",monospace;
  font-size:.82rem;line-height:1.55;color:var(--text);tab-size:2}
.embed-bar{display:flex;justify-content:space-between;align-items:center;gap:1rem;padding:.6rem .9rem;border-top:1px solid var(--border-soft)}
.embed-bar span{font-family:var(--font-mono);font-size:var(--step--1);color:var(--muted)}
.embed-bar a{font-family:var(--font-mono);font-size:var(--step--1);color:var(--accent)}