/* Stephen Ahiabah, dark editorial system.
   Serif display (Instrument Serif), sans body (Instrument Sans), mono for data (JetBrains Mono). */
:root{
  color-scheme:dark;
  --bg:#0d1014;--bg-2:#12161c;--bg-3:#191e26;
  --ink:#ece8df;--muted:#a19d94;--faint:#6f6c65;
  --line:rgba(236,232,223,.12);--line-2:rgba(236,232,223,.26);
  --gold:#f2c14e;--risk:#e0664a;
  --serif:"Instrument Serif",Georgia,serif;
  --sans:"Instrument Sans",system-ui,-apple-system,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,monospace;
  --gutter:clamp(1rem,4vw,3.5rem);--max:1440px;
  --fs-display:clamp(3rem,6.4vw,6.6rem);
  --fs-h2:clamp(2.2rem,4vw,3.8rem);
  --fs-h3:clamp(1.45rem,2vw,1.95rem);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:400 1.0625rem/1.6 var(--sans);-webkit-font-smoothing:antialiased}
::selection{background:var(--gold);color:var(--bg)}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
button,input,textarea{font:inherit;color:inherit}
h1,h2,h3,h4,p,dl,dd,ul,figure{margin-top:0}
h1,h2,h3{font-family:var(--serif);font-weight:400;letter-spacing:-.01em}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px}
.skip-link{position:fixed;top:1rem;left:1rem;z-index:200;transform:translateY(-200%);background:var(--gold);color:var(--bg);padding:.7rem 1rem}
.skip-link:focus{transform:none}
.shell{max-width:var(--max);margin-inline:auto;padding-inline:var(--gutter)}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:80;background:rgba(13,16,20,.86);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.site-header .shell{height:68px;display:flex;align-items:center;justify-content:space-between;gap:2rem}
.wordmark{font:400 1.45rem/1 var(--serif);letter-spacing:-.01em;white-space:nowrap}
.site-nav{display:flex;align-items:center;gap:clamp(1.1rem,2.4vw,2.2rem);font-size:.9rem;color:var(--muted)}
.site-nav>a{position:relative;padding:.3rem 0;transition:color 150ms}
.site-nav>a:hover,.site-nav>a.active{color:var(--ink)}
.site-nav>a.active:after{content:"";position:absolute;left:50%;bottom:-.35rem;width:4px;height:4px;margin-left:-2px;border-radius:50%;background:var(--gold)}
.nav-social{display:none}
.menu-toggle{display:none;border:0;background:none;cursor:pointer;align-items:center;gap:.6rem;font-size:.9rem;padding:.4rem 0}
.menu-toggle i{width:1.3rem;height:1px;background:currentColor;display:block;position:relative}
.menu-toggle i:after{content:"";position:absolute;width:1.3rem;height:1px;background:currentColor;left:0;top:5px}

/* ---------- status bar (ledger) ---------- */
.status-bar{border-bottom:1px solid var(--line);font:500 .7rem/1.4 var(--mono);text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.status-bar .shell{display:flex;justify-content:space-between;gap:1.5rem;padding-block:.65rem}
.status-bar b{font-weight:500;color:var(--ink)}
.status-bar .dot{display:inline-block;width:7px;height:7px;margin-right:.55rem;border-radius:50%;background:var(--gold);vertical-align:1px;animation:pulse 1.6s ease-in-out infinite}
@keyframes pulse{50%{opacity:.25}}

/* ---------- shared type and controls ---------- */
.kicker{margin:0 0 1rem;font:500 .75rem/1.4 var(--mono);text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}
.kicker.gold{color:var(--gold)}
.lede{font-size:clamp(1.08rem,1.35vw,1.25rem);line-height:1.55;color:var(--muted);max-width:40rem}
.btn{display:inline-flex;align-items:center;gap:.6rem;padding:.8rem 1.25rem;border-radius:999px;border:1px solid var(--line-2);font-size:.92rem;font-weight:500;cursor:pointer;background:transparent;transition:background 160ms,color 160ms,border-color 160ms}
.btn:hover{border-color:var(--ink)}
.btn-gold{background:var(--gold);border-color:var(--gold);color:var(--bg)}
.btn-gold:hover{background:var(--ink);border-color:var(--ink)}
.link{display:inline-flex;align-items:center;gap:.45rem;border-bottom:1px solid var(--line-2);padding-bottom:.15rem;font-size:.92rem;transition:border-color 150ms,color 150ms}
.link:hover{border-color:var(--gold);color:var(--gold)}
.tags{display:flex;flex-wrap:wrap;gap:.4rem;margin-top:1.2rem}
.tags span{font:400 .72rem/1 var(--mono);padding:.42rem .6rem;border:1px solid var(--line);border-radius:999px;color:var(--muted)}

.section{padding-block:clamp(4.5rem,8vw,7.5rem);border-top:1px solid var(--line)}
.section-head{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:2rem clamp(2rem,6vw,6rem);align-items:end;margin-bottom:clamp(2.5rem,5vw,4rem)}
.section-head h2{font-size:var(--fs-h2);line-height:1.02;margin:0}
.section-head p:not(.kicker){margin:0;color:var(--muted);max-width:34rem}

.page-head{padding-block:clamp(3.5rem,7vw,6.5rem) clamp(3rem,5vw,4.5rem);display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);gap:2rem clamp(2rem,6vw,6rem);align-items:end}
.page-head h1{font-size:var(--fs-display);line-height:.95;margin:0}
.page-head h1 em{font-style:italic;color:var(--gold)}
.page-head .lede{margin:0}

/* ---------- home: intro + loss model ---------- */
.intro{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(240px,.6fr);gap:clamp(2rem,6vw,6rem);align-items:end;padding-block:clamp(3rem,6vw,5.5rem) clamp(3rem,5vw,4.5rem)}
.intro h1{font-size:var(--fs-display);line-height:.92;margin:0 0 1.6rem}
.intro-big{font:400 clamp(1.55rem,2.5vw,2.3rem)/1.18 var(--serif);margin:0 0 1.3rem;max-width:30ch}
.intro .lede{margin:0 0 2rem}
.intro-portrait{margin:0}
.intro-portrait img{width:100%;height:auto;aspect-ratio:4/5;object-fit:cover;object-position:50% 20%;filter:grayscale(1) contrast(1.08);border-radius:6px}
.intro-portrait figcaption{display:flex;justify-content:space-between;gap:1rem;margin-top:.8rem;font:400 .7rem var(--mono);text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.sim-actions{display:flex;flex-wrap:wrap;align-items:center;gap:1.4rem}
.loss-model{display:grid;grid-template-columns:minmax(280px,.62fr) minmax(0,1.6fr);gap:clamp(1.5rem,4vw,3.5rem);align-items:start;padding-block:clamp(3rem,5vw,4.5rem) clamp(2rem,4vw,3rem);border-top:1px solid var(--line)}
.model-out{min-width:0}
.model-card{border:1px solid var(--line-2);border-radius:14px;padding:1.3rem 1.3rem 1.1rem;background:var(--bg-2)}
.model-card h2{font-size:1.6rem;line-height:1.1;margin:0 0 .4rem}
.model-card>p{margin:0 0 1.1rem;color:var(--muted);font-size:.86rem;line-height:1.5}
.slider{display:grid;grid-template-columns:1fr auto;gap:.35rem .8rem;padding:.75rem 0;border-top:1px solid var(--line)}
.slider label{font-size:.86rem}
.slider output{font:500 .82rem var(--mono);color:var(--gold)}
.slider input{grid-column:1/-1;width:100%;accent-color:var(--gold);margin:0;height:18px;cursor:pointer}
.sim-plot{position:relative;height:clamp(260px,36vh,400px)}
.sim-plot canvas{position:absolute;inset:0;width:100%;height:100%}
.sim-readout{display:grid;grid-template-columns:repeat(4,minmax(0,1fr)) auto;gap:1.5rem;align-items:end;padding-block:1.4rem 2.2rem;border-top:1px solid var(--line);font:400 .72rem/1.5 var(--mono);text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}
.sim-readout b{display:block;margin-top:.2rem;font:400 clamp(1.6rem,2.4vw,2.2rem)/1.05 var(--serif);letter-spacing:0;text-transform:none;color:var(--ink)}
.sim-readout .risk b{color:var(--risk)}
.sim-note{margin:0;padding-bottom:2rem;font:400 .72rem/1.6 var(--mono);color:var(--faint)}

/* ---------- home: services ---------- */
.services{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line-2)}
.services article{padding:2rem 2rem 2.4rem 0;border-right:1px solid var(--line)}
.services article+article{padding-left:2rem}
.services article:last-child{border-right:0}
.services .num{font:400 .75rem var(--mono);color:var(--gold)}
.services h3{font-size:var(--fs-h3);line-height:1.1;margin:1.2rem 0 .8rem}
.services p{color:var(--muted);margin:0 0 1rem;font-size:.98rem}
.services ul{list-style:none;padding:0;margin:0;font:400 .78rem/1.9 var(--mono);color:var(--ink)}
.services li:before{content:"+ ";color:var(--gold)}
.services-cta{display:flex;flex-wrap:wrap;gap:1.4rem;align-items:center;margin-top:2.5rem}

/* ---------- ledger tables ---------- */
.ledger{width:100%;border-collapse:collapse;border-top:1px solid var(--line-2)}
.ledger td{padding:1.3rem 1rem 1.3rem 0;border-bottom:1px solid var(--line);vertical-align:baseline}
.ledger td:first-child{width:28%;font:400 clamp(2rem,3.6vw,3.3rem)/1 var(--serif);color:var(--ink);white-space:nowrap}
.ledger td:nth-child(2){font-size:1.02rem}
.ledger td:last-child{text-align:right;font:400 .72rem var(--mono);text-transform:uppercase;letter-spacing:.05em;color:var(--muted);white-space:nowrap}

/* ---------- writing cards ---------- */
.shelf{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.shelf a{display:flex;flex-direction:column;min-height:260px;padding:1.5rem;background:var(--bg);transition:background 160ms}
.shelf a:hover{background:var(--bg-2)}
.shelf span{font:400 .7rem var(--mono);text-transform:uppercase;letter-spacing:.06em;color:var(--gold)}
.shelf h3{font-size:1.65rem;line-height:1.08;margin:1rem 0 .7rem}
.shelf p{color:var(--muted);font-size:.9rem;margin:0}
.shelf i{margin-top:auto;padding-top:1.2rem;font-style:normal;color:var(--muted)}

/* ---------- global CTA + footer ---------- */
.cta-band{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--line)}
.cta-band a{display:block;padding:clamp(3rem,6vw,5rem) var(--gutter);transition:background 180ms}
.cta-band a+a{border-left:1px solid var(--line)}
.cta-band a:hover{background:var(--bg-2)}
.cta-band h2{font-size:var(--fs-h2);line-height:1;margin:0 0 1rem}
.cta-band p:not(.kicker){color:var(--muted);max-width:30rem;margin:0 0 1.6rem}
.cta-band .go{font:500 .8rem var(--mono);text-transform:uppercase;letter-spacing:.06em;color:var(--gold)}
.site-footer{border-top:1px solid var(--line);font:400 .72rem/1.5 var(--mono);text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}
.site-footer .shell{min-height:80px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:1rem 2rem;padding-block:1.4rem}
.site-footer nav{display:flex;flex-wrap:wrap;gap:1.4rem}
.site-footer a:hover{color:var(--gold)}

/* ---------- experience ---------- */
.ticker{overflow:hidden;white-space:nowrap;border-block:1px solid var(--line);font:500 .74rem/1 var(--mono);text-transform:uppercase;letter-spacing:.05em;color:var(--muted);padding:.9rem 0}
.ticker div{display:inline-block;animation:tick 45s linear infinite}
.ticker span{margin:0 1.4rem}
.ticker span:nth-child(3n+1){color:var(--ink)}
@keyframes tick{to{transform:translateX(-50%)}}
.gantt{padding-block:2.5rem 3rem}
.gantt-head{display:flex;justify-content:space-between;margin-bottom:1rem;font:400 .72rem var(--mono);text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}
.gantt-rows{position:relative;border-left:1px solid var(--line);border-right:1px solid var(--line)}
.gantt-grid{position:absolute;inset:0;display:grid;grid-template-columns:repeat(10,1fr);pointer-events:none}
.gantt-grid span{border-right:1px dashed var(--line)}
.gantt-row{position:relative;height:46px;border-bottom:1px solid var(--line)}
.gantt-row:first-child{border-top:1px solid var(--line)}
.gantt-bar{position:absolute;top:9px;bottom:9px;border-radius:4px;background:var(--bg-3);border:1px solid var(--line-2);display:flex;align-items:center;padding:0 .7rem;font-size:.8rem;white-space:nowrap;overflow:visible}
.gantt-bar.jpm{background:#2a2f38}
.gantt-bar.now{background:var(--gold);border-color:var(--gold);color:var(--bg);font-weight:600}
.gantt-bar small{margin-left:.6rem;font:400 .68rem var(--mono);color:var(--muted)}
.gantt-bar.now .out{position:absolute;right:calc(100% + .6rem);color:var(--gold)}
.gantt-bar.now .out small{color:var(--muted)}
.gantt-axis{display:grid;grid-template-columns:repeat(10,1fr);font:400 .7rem var(--mono);color:var(--faint);padding-top:.5rem}
.gantt-axis span{transform:translateX(-50%)}

.jobs{border-top:1px solid var(--line-2)}
.job{display:grid;grid-template-columns:140px minmax(0,1.1fr) minmax(0,1fr);gap:1.5rem clamp(1.5rem,4vw,4rem);padding-block:2.4rem;border-bottom:1px solid var(--line)}
.job-when{font:400 .75rem/1.7 var(--mono);color:var(--muted);text-transform:uppercase}
.job-when img{width:110px;height:30px;object-fit:contain;object-position:left center;filter:brightness(0) invert(1);opacity:.7;margin-bottom:1rem}
.job.current .job-when{color:var(--gold)}
.job h3{font-size:clamp(1.8rem,2.8vw,2.6rem);line-height:1.02;margin:0 0 .4rem}
.job .org{font:400 .74rem var(--mono);text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin:0 0 1rem}
.job .summary{font:400 clamp(1.15rem,1.5vw,1.35rem)/1.4 var(--serif);margin:0}
.job ul{margin:0;padding:0;list-style:none;color:var(--muted);font-size:.95rem}
.job li{position:relative;padding:0 0 .6rem 1.1rem}
.job li:before{content:"";position:absolute;left:0;top:.7em;width:5px;height:1px;background:var(--gold)}

.pitch-wrap{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:clamp(2rem,5vw,5rem);align-items:start}
.pitch{position:relative;aspect-ratio:68/88;border:1px solid var(--line-2);border-radius:6px;background:repeating-linear-gradient(0deg,#141920 0 10%,#11151b 10% 20%);overflow:hidden}
.pitch svg{position:absolute;inset:0;width:100%;height:100%}
.player{position:absolute;transform:translate(-50%,-50%);width:118px;text-align:center}
.player i{display:grid;place-items:center;width:40px;height:40px;margin:0 auto .45rem;border-radius:50%;background:var(--ink);color:var(--bg);font:600 .82rem/1 var(--mono);font-style:normal;box-shadow:0 0 0 4px var(--bg)}
.player span{display:block;font-size:.78rem;line-height:1.2}
.player.fwd i{background:var(--gold)}
.player.gk i{background:transparent;color:var(--ink);border:1px solid var(--ink)}
.pitch-label{position:absolute;left:.9rem;font:400 .66rem var(--mono);text-transform:uppercase;letter-spacing:.06em;color:var(--faint)}
.bench h3{font-size:1.5rem;margin:0 0 .3rem}
.bench dl{margin:0;border-top:1px solid var(--line-2)}
.bench dl div{display:grid;grid-template-columns:140px 1fr;gap:1rem;padding:1rem 0;border-bottom:1px solid var(--line)}
.bench dt{font:400 .74rem/1.6 var(--mono);text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}
.bench dd{margin:0;font-size:.95rem}

.edu{display:grid;grid-template-columns:minmax(0,1.3fr) repeat(2,minmax(0,.7fr));gap:1px;background:var(--line);border:1px solid var(--line)}
.edu>div{background:var(--bg);padding:1.8rem}
.edu h3{font-size:1.8rem;line-height:1.05;margin:0 0 .5rem}
.edu p{color:var(--muted);font-size:.95rem;margin:0}
.edu strong{display:block;font:400 3.4rem/1 var(--serif);color:var(--gold);margin-bottom:.8rem}

/* ---------- projects ---------- */
.project{padding-block:clamp(4rem,7vw,6.5rem);border-top:1px solid var(--line)}
.project-grid{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.3fr);gap:clamp(2rem,6vw,6rem);align-items:start}
.project-visual{position:sticky;top:96px;aspect-ratio:1/1;border:1px solid var(--line);border-radius:10px;background:var(--bg-2);display:grid;place-items:center;overflow:hidden}
.project-visual img{width:58%;max-height:70%;object-fit:contain}
.project-visual.on-light{background:#e9e4da}
.project-visual.photo img{width:100%;height:100%;max-height:none;object-fit:cover}
.project-visual figcaption{position:absolute;left:1rem;bottom:.9rem;font:400 .7rem var(--mono);text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.project-visual.on-light figcaption{color:#555}
.project h2{font-size:clamp(2.6rem,5vw,4.6rem);line-height:.98;margin:0 0 1.2rem}
.project .summary{font:400 clamp(1.25rem,1.9vw,1.6rem)/1.35 var(--serif);margin-bottom:1.2rem}
.project p{color:var(--muted)}
.project .summary{color:var(--ink)}
.facts{margin:1.6rem 0 2rem;border-top:1px solid var(--line)}
.facts div{display:grid;grid-template-columns:120px 1fr;gap:1rem;padding:.85rem 0;border-bottom:1px solid var(--line);font-size:.9rem}
.facts dt{font:400 .72rem/1.7 var(--mono);text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}
.facts dd{margin:0}
.project .shelf{margin-top:clamp(3rem,5vw,4rem)}
.project .shelf.three{grid-template-columns:repeat(3,1fr)}
.principles{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.principles article{background:var(--bg);padding:1.8rem}
.principles h3{font-size:1.6rem;margin:0 0 .6rem}
.principles p{color:var(--muted);margin:0;font-size:.95rem}

/* ---------- about ---------- */
.about-hero{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);gap:clamp(2rem,6vw,6rem);padding-block:clamp(3rem,6vw,5.5rem);align-items:end}
.about-portrait{position:relative;margin:0}
.about-portrait img{width:100%;aspect-ratio:4/5;object-fit:cover;object-position:50% 20%;filter:grayscale(1) contrast(1.08);border-radius:6px}
.about-portrait figcaption{display:flex;justify-content:space-between;margin-top:.8rem;font:400 .7rem var(--mono);text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.about-hero h1{font-size:var(--fs-display);line-height:.95;margin:0 0 2rem}
.about-hero .big{font:400 clamp(1.6rem,2.6vw,2.4rem)/1.2 var(--serif);margin:0 0 1.6rem}
.about-hero .big em{color:var(--gold)}
.about-hero p:not(.big):not(.kicker){color:var(--muted);max-width:36rem}
.route{display:grid;grid-template-columns:repeat(6,1fr);border-top:1px solid var(--line-2)}
.route div{position:relative;padding:1.6rem 1.2rem 1.6rem 0}
.route div:before{content:"";position:absolute;top:-5px;left:0;width:9px;height:9px;border-radius:50%;background:var(--bg);border:1px solid var(--ink)}
.route div:last-child:before{background:var(--gold);border-color:var(--gold)}
.route span{font:400 .72rem var(--mono);color:var(--muted)}
.route h3{font-size:1.35rem;line-height:1.1;margin:.5rem 0 .4rem}
.route p{font-size:.88rem;color:var(--muted);margin:0}
.rules{border-top:1px solid var(--line-2)}
.rules article{display:grid;grid-template-columns:80px minmax(0,1fr) minmax(0,1fr);gap:1.5rem;padding:1.8rem 0;border-bottom:1px solid var(--line);align-items:baseline}
.rules span{font:400 .75rem var(--mono);color:var(--gold)}
.rules h3{font-size:clamp(1.7rem,3vw,2.6rem);line-height:1.05;margin:0}
.rules p{margin:0;color:var(--muted)}
.facts-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.facts-grid div{background:var(--bg);padding:1.4rem}
.facts-grid dt{font:400 .7rem var(--mono);text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin-bottom:.6rem}
.facts-grid dd{margin:0;font:400 1.25rem/1.25 var(--serif)}

/* ---------- contact ---------- */
.contact-head{padding-block:clamp(3.5rem,7vw,6rem) clamp(2.5rem,4vw,3.5rem)}
.contact-head h1{font-size:var(--fs-display);line-height:.95;margin:0 0 1.4rem;max-width:16ch}
.contact-head .email{display:inline-block;font:400 clamp(1.5rem,3.2vw,2.8rem)/1.1 var(--serif);border-bottom:1px solid var(--gold);color:var(--gold);overflow-wrap:anywhere}
.contact-head .email:hover{color:var(--ink);border-color:var(--ink)}
.copy-btn{margin-left:1rem;vertical-align:middle;border:1px solid var(--line-2);background:none;border-radius:999px;padding:.4rem .8rem;font:500 .72rem var(--mono);text-transform:uppercase;letter-spacing:.05em;color:var(--muted);cursor:pointer}
.copy-btn:hover{color:var(--ink);border-color:var(--ink)}
.routes{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(0,1fr);border-top:1px solid var(--line-2)}
.routes>section{padding:clamp(2rem,4vw,3.5rem) clamp(1.5rem,3vw,3rem) clamp(2.5rem,4vw,4rem) 0}
.routes>section+section{padding-left:clamp(1.5rem,3vw,3rem);padding-right:0;border-left:1px solid var(--line)}
.routes h2{font-size:clamp(2rem,3.4vw,3.1rem);line-height:1.02;margin:0 0 1rem}
.routes p{color:var(--muted)}
.steps{list-style:none;padding:0;margin:1.8rem 0 2.2rem;counter-reset:s;border-top:1px solid var(--line)}
.steps li{counter-increment:s;display:grid;grid-template-columns:44px 1fr;gap:.6rem;padding:.9rem 0;border-bottom:1px solid var(--line);font-size:.96rem}
.steps li:before{content:counter(s,decimal-leading-zero);font:400 .75rem/1.9 var(--mono);color:var(--gold)}
.steps b{font-weight:500}
.brief{border:1px solid var(--line-2);border-radius:14px;padding:1.4rem;background:var(--bg-2)}
.brief fieldset{border:0;padding:0;margin:0 0 1.3rem}
.brief legend{padding:0;margin-bottom:.7rem;font:500 .74rem var(--mono);text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.chips{display:flex;flex-wrap:wrap;gap:.45rem}
.chips label{position:relative;cursor:pointer}
.chips input{position:absolute;opacity:0;pointer-events:none}
.chips span{display:inline-block;padding:.5rem .85rem;border:1px solid var(--line-2);border-radius:999px;font-size:.86rem;transition:all 140ms}
.chips label:hover span{border-color:var(--ink)}
.chips input:checked+span{background:var(--ink);border-color:var(--ink);color:var(--bg)}
.chips input:focus-visible+span{outline:2px solid var(--gold);outline-offset:2px}
.brief textarea{width:100%;min-height:120px;resize:vertical;padding:.9rem;border:1px solid var(--line-2);border-radius:10px;background:var(--bg);font-size:.95rem;line-height:1.5}
.brief textarea:focus{outline:none;border-color:var(--gold)}
.brief-foot{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:1rem;margin-top:1rem}
.brief-foot small{color:var(--faint);font-size:.8rem;max-width:26rem}
.channel-list{margin:1.8rem 0 0;border-top:1px solid var(--line)}
.channel-list a{display:grid;grid-template-columns:110px 1fr auto;gap:1rem;align-items:baseline;padding:1rem 0;border-bottom:1px solid var(--line);transition:color 150ms}
.channel-list a:hover{color:var(--gold)}
.channel-list span{font:400 .72rem var(--mono);text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}
.channel-list strong{font:400 1.35rem/1.2 var(--serif)}

/* ---------- reveal ---------- */
[data-reveal]{opacity:0;transform:translateY(16px);transition:opacity 600ms ease var(--delay,0ms),transform 600ms cubic-bezier(.2,.7,.2,1) var(--delay,0ms)}
[data-reveal].is-visible{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}[data-reveal]{opacity:1;transform:none}}

/* ---------- responsive ---------- */
@media(max-width:980px){
  .menu-toggle{display:flex}
  .site-nav{position:fixed;inset:68px 0 auto;height:calc(100svh - 68px);background:var(--bg);flex-direction:column;align-items:stretch;justify-content:flex-start;gap:0;padding:2rem var(--gutter);opacity:0;visibility:hidden;transform:translateY(-.5rem);transition:opacity 200ms,transform 200ms,visibility 200ms}
  .site-nav.is-open{opacity:1;visibility:visible;transform:none}
  .site-nav>a{font:400 2.4rem/1.25 var(--serif);color:var(--ink);padding:.3rem 0;border-bottom:1px solid var(--line)}
  .site-nav>a.active:after{display:none}
  .site-nav>a.active{color:var(--gold)}
  .nav-social{display:flex;gap:1.4rem;margin-top:2rem;font:400 .8rem var(--mono);text-transform:uppercase;color:var(--muted)}
  body.menu-open{overflow:hidden}
  .intro,.loss-model,.page-head,.section-head,.pitch-wrap,.project-grid,.about-hero,.routes{grid-template-columns:1fr}
  .intro-portrait{max-width:320px}
  .gantt-rows{overflow:visible}
  .gantt-row{height:58px}
  .gantt-bar{top:30px;bottom:8px;padding:0}
  .gantt-bar .l{position:absolute;left:0;bottom:calc(100% + 5px);font-size:.74rem;color:var(--ink)}
  .gantt-bar.flip .l{left:auto;right:0}
  .gantt-bar small{display:none}
  .gantt-bar.now .out{right:0;bottom:calc(100% + 5px);top:auto}
  .sim-readout{grid-template-columns:repeat(2,1fr)}
  .sim-readout .btn{grid-column:1/-1;justify-self:start}
  .services{grid-template-columns:1fr}
  .services article,.services article+article{padding:1.8rem 0;border-right:0;border-bottom:1px solid var(--line)}
  .shelf,.project .shelf.three{grid-template-columns:repeat(2,1fr)}
  .job{grid-template-columns:110px 1fr}
  .job ul{grid-column:2}
  .project-visual{position:relative;top:0;max-width:440px}
  .route{grid-template-columns:repeat(3,1fr)}
  .rules article{grid-template-columns:50px 1fr}
  .rules p{grid-column:2}
  .facts-grid{grid-template-columns:repeat(2,1fr)}
  .edu{grid-template-columns:1fr 1fr}.edu>div:first-child{grid-column:1/-1}
  .routes>section,.routes>section+section{padding:2.4rem 0;border-left:0}
  .routes>section+section{border-top:1px solid var(--line)}
  .principles{grid-template-columns:1fr}
}
@media(max-width:640px){
  .site-header .shell{height:60px}
  .site-nav{inset:60px 0 auto;height:calc(100svh - 60px)}
  .status-bar .shell>span:nth-child(2){display:none}
  .intro h1{font-size:clamp(2.9rem,13vw,3.8rem)}
  .intro-portrait{max-width:280px}
  .page-head h1,.contact-head h1,.about-hero h1{font-size:clamp(2.8rem,12vw,3.8rem)}
  .sim-plot{height:240px}
  .shelf,.project .shelf.three{grid-template-columns:1fr}
  .shelf a{min-height:0}
  .ledger td:first-child{width:auto;font-size:1.9rem}
  .ledger td:last-child{display:none}
  .cta-band{grid-template-columns:1fr}
  .cta-band a+a{border-left:0;border-top:1px solid var(--line)}
  .job{grid-template-columns:1fr;gap:1rem}
  .job ul{grid-column:1}
  .gantt-axis span:nth-child(even){visibility:hidden}
  .player{width:80px}
  .player i{width:32px;height:32px;font-size:.72rem}
  .player span{font-size:.66rem}
  .bench dl div{grid-template-columns:1fr;gap:.3rem}
  .route{grid-template-columns:1fr 1fr}
  .edu{grid-template-columns:1fr}
  .facts-grid{grid-template-columns:1fr}
  .channel-list a{grid-template-columns:1fr auto}
  .channel-list span{grid-column:1/-1}
  .copy-btn{margin:1rem 0 0;display:block}
}