:root{--bg:#f5f9ff;--surface:#fff;--ink:#0f2440;--muted:#5b6f8a;--line:#d8e6f8;--blue:#1f6feb;--blue-d:#1454b8;--tint:#e6f0ff;--cyan:#22b8cf}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Inter',system-ui,sans-serif;background:var(--bg);color:var(--ink);line-height:1.65;-webkit-font-smoothing:antialiased}
h1,h2,h3,h4{font-family:'Sora','Inter',sans-serif;line-height:1.2;letter-spacing:-.01em}
a{color:var(--blue);text-decoration:none}a:hover{color:var(--blue-d)}
:focus-visible{outline:3px solid var(--cyan);outline-offset:2px;border-radius:6px}
.wrap{max-width:1100px;margin:0 auto;padding:0 24px}
header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{font-family:'Sora';font-weight:700;color:var(--ink);font-size:1.1rem}.brand span{color:var(--blue)}
nav ul{display:flex;gap:4px;list-style:none}
nav a{display:block;padding:8px 12px;border-radius:8px;color:var(--muted);font-size:.93rem;font-weight:500}
nav a:hover,nav a.on{background:var(--tint);color:var(--blue-d)}
.burger{display:none;background:none;border:1px solid var(--line);border-radius:8px;padding:6px 10px;font-size:1.1rem;cursor:pointer}
.hero{padding:72px 0 56px;background:linear-gradient(180deg,#e9f2ff 0%,var(--bg) 100%)}
.hero-grid{display:grid;grid-template-columns:1.3fr .7fr;gap:48px;align-items:center}
.hero h1{font-size:clamp(2.2rem,5vw,3.4rem);margin-bottom:14px}
.role{font-size:1.15rem;color:var(--muted);margin-bottom:20px;min-height:1.7em}
.role b{color:var(--blue-d)}
.lead{max-width:60ch;color:#33496a;margin-bottom:26px}
.btns{display:flex;flex-wrap:wrap;gap:12px}
.btn{display:inline-block;padding:11px 20px;border-radius:10px;font-weight:600;font-size:.95rem;border:1.5px solid var(--blue);transition:.15s}
.btn.pri{background:var(--blue);color:#fff}.btn.pri:hover{background:var(--blue-d);color:#fff}
.btn.sec{background:#fff;color:var(--blue)}.btn.sec:hover{background:var(--tint)}
.photo{position:relative;justify-self:center}
.photo img{width:min(300px,70vw);aspect-ratio:1;object-fit:cover;object-position:top;border-radius:28px;border:6px solid #fff;box-shadow:0 20px 50px rgba(31,111,235,.22)}
.photo .tag{position:absolute;left:-14px;bottom:22px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:8px 14px;font-size:.82rem;font-weight:600;box-shadow:0 8px 24px rgba(15,36,64,.1)}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:44px}
.stat{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:18px}
.stat b{display:block;font-family:'Sora';font-size:1.7rem;color:var(--blue)}.stat span{color:var(--muted);font-size:.88rem}
section{padding:60px 0}
section.alt{background:#fff;border-block:1px solid var(--line)}
.sh{margin-bottom:30px;max-width:62ch}.sh h2{font-size:clamp(1.6rem,3vw,2.1rem);margin-bottom:8px}.sh p{color:var(--muted)}
.page-head{padding:56px 0 24px;background:linear-gradient(180deg,#e9f2ff,var(--bg))}
.page-head h1{font-size:clamp(2rem,4vw,2.8rem);margin-bottom:8px}.page-head p{color:var(--muted);max-width:62ch}
.grid{display:grid;gap:20px}.g2{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(3,1fr)}
.card{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:24px;display:flex;flex-direction:column;gap:10px}
.card h3{font-size:1.08rem}.card p{color:#42587a;font-size:.95rem}
.card .meta{color:var(--blue-d);font-size:.85rem;font-weight:600}
.chips{display:flex;flex-wrap:wrap;gap:6px;margin-top:auto;padding-top:6px}
.chip{background:var(--tint);color:var(--blue-d);border-radius:999px;padding:3px 11px;font-size:.78rem;font-weight:600}
.links{display:flex;gap:14px;font-weight:600;font-size:.9rem}
.timeline{border-left:2px solid var(--line);margin-left:6px}
.job{position:relative;padding:0 0 30px 28px}
.job:before{content:"";position:absolute;left:-9px;top:6px;width:16px;height:16px;border-radius:50%;background:var(--blue);border:3px solid var(--bg)}
.job h3{font-size:1.1rem}.job .when{color:var(--blue-d);font-weight:600;font-size:.88rem;margin-bottom:6px}
.job ul{padding-left:18px;color:#42587a;font-size:.95rem}.job li{margin-bottom:3px}
.filters{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:24px}
.filters button{border:1px solid var(--line);background:#fff;color:var(--muted);border-radius:999px;padding:7px 16px;font:600 .88rem 'Inter';cursor:pointer}
.filters button.on,.filters button:hover{background:var(--blue);border-color:var(--blue);color:#fff}
.award{flex-direction:row;gap:16px;align-items:flex-start}
.award .ic{flex:none;width:44px;height:44px;border-radius:12px;background:var(--tint);color:var(--blue);display:grid;place-items:center;font-weight:800;font-family:'Sora'}
.contact-list{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.contact-list b{font-size:.85rem;color:var(--muted);font-weight:600}
footer{padding:28px 0;border-top:1px solid var(--line);background:#fff;color:var(--muted);font-size:.9rem}
footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}
.hide{display:none!important}
@media(max-width:860px){.hero-grid{grid-template-columns:1fr}.photo{order:-1}.stats{grid-template-columns:repeat(2,1fr)}.g3,.g2,.contact-list{grid-template-columns:1fr}
.burger{display:block}nav ul{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;padding:10px 16px}nav ul.open{display:flex}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}


/* Portfolio refresh: colour, depth and motion */
:root{--violet:#7557e8;--mint:#20bfa9;--sky:#35a8ee;--pink:#ed6ca7;--amber:#f5ad36}
body{background:linear-gradient(135deg,#f5f9ff 0%,#f7f5ff 52%,#f1fbff 100%)}
header{box-shadow:0 5px 24px rgba(24,54,105,.055)}
.brand{font-size:1.2rem;letter-spacing:-.04em}
nav a{transition:background .25s ease,color .25s ease,transform .25s ease}
nav a:hover{transform:translateY(-2px)}
.hero{position:relative;overflow:hidden;background:radial-gradient(ellipse at 78% 20%,rgba(117,87,232,.16),transparent 35%),radial-gradient(ellipse at 8% 90%,rgba(32,191,169,.12),transparent 32%),linear-gradient(180deg,#eaf2ff 0%,#f5f9ff 100%)}
.hero:before{content:"";position:absolute;width:390px;height:390px;border-radius:50%;right:-130px;top:-180px;background:linear-gradient(135deg,rgba(53,168,238,.16),rgba(117,87,232,.13));filter:blur(2px);pointer-events:none}
.hero-grid,.hero .stats{position:relative;z-index:1}
.hero h1{letter-spacing:-.055em}
.photo img{aspect-ratio:4/5;object-position:center 22%;background:#e9eff9;border:6px solid rgba(255,255,255,.95);box-shadow:0 24px 65px rgba(71,91,170,.22);transition:transform .45s cubic-bezier(.2,.8,.2,1)}
.photo:hover img{transform:translateY(-5px) rotate(.5deg)}
.btn{transition:transform .22s ease,box-shadow .22s ease,background .22s ease}
.btn:hover{transform:translateY(-3px);box-shadow:0 10px 24px rgba(31,111,235,.16)}
.stat,.card{box-shadow:0 8px 24px rgba(34,63,115,.035);transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease}
.stat:hover,.card:hover{transform:translateY(-4px);box-shadow:0 16px 36px rgba(57,83,145,.11);border-color:#b9cfff}
.card h3{letter-spacing:-.025em}
section.alt{background:rgba(255,255,255,.74)}
.page-head{background:radial-gradient(ellipse at 90% 0%,rgba(117,87,232,.15),transparent 40%),linear-gradient(180deg,#eaf2ff,var(--bg))}
/* reveal is progressively enhanced by js; content remains visible without it */
.js-motion .reveal{opacity:0;transform:translateY(18px);transition:opacity .65s ease,transform .65s cubic-bezier(.2,.8,.2,1)}
.js-motion .reveal.is-visible{opacity:1;transform:none}
@media(max-width:860px){.photo img{width:min(280px,72vw)}.hero{padding-top:44px}}
@media(prefers-reduced-motion:reduce){.js-motion .reveal{opacity:1;transform:none;transition:none}.stat,.card,.btn,.photo img,nav a{transition:none!important}}

.credential{position:relative;min-height:220px;overflow:hidden}.credential-mark{width:48px;height:48px;border-radius:14px;display:grid;place-items:center;color:#fff;font-size:1.35rem;background:linear-gradient(135deg,var(--blue),var(--violet));box-shadow:0 8px 20px rgba(117,87,232,.22)}.credential-image img{width:58px;height:58px;object-fit:contain;border-radius:12px;background:#fff;border:1px solid var(--line);padding:5px}.credential .links{margin-top:4px}.award-grid{align-items:stretch}.award-card{padding:16px;display:grid;grid-template-columns:minmax(120px, .8fr) 1.2fr;gap:18px;align-items:center}.award-image{display:block;overflow:hidden;border-radius:12px;background:#f3f6fc;border:1px solid var(--line);min-height:150px}.award-image img{display:block;width:100%;height:190px;object-fit:contain;background:#f7f9fd;transition:transform .35s ease}.award-image:hover img{transform:scale(1.04)}.award-copy{display:flex;flex-direction:column;gap:8px}.award-copy a{font-size:.9rem;font-weight:700}.award-copy p{font-size:.9rem}@media(max-width:650px){.award-card{grid-template-columns:1fr}.award-image img{height:220px}}

/* Interactive engineering workflow visualization */
.workflow-tabs{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0}
.workflow-tab{border:1px solid var(--line,#cfe0ff);background:#fff;color:#24518c;border-radius:999px;padding:10px 16px;font:inherit;font-weight:600;cursor:pointer;transition:background .2s,transform .2s}
.workflow-tab:hover{transform:translateY(-2px)}
.workflow-tab.active{background:#e5efff;border-color:#8bb8ff;color:#155bd7;box-shadow:0 5px 16px #1d4ed81a}
.workflow-card{overflow:hidden}
.workflow-track{display:flex;align-items:center;justify-content:center;gap:12px;padding:18px 4px;flex-wrap:wrap}
.workflow-node{min-width:145px;flex:1;text-align:center;padding:18px 12px;border:1px solid #cfe0ff;border-radius:14px;background:linear-gradient(145deg,#fff,#f2f7ff);display:flex;flex-direction:column;gap:6px;animation:flowIn .35s ease both}
.workflow-node span{font-size:.76rem;font-weight:800;color:#2875e8;letter-spacing:.08em}
.workflow-node b{color:#142c4e}
.workflow-node small{color:#61738e}
.workflow-track>i{font-style:normal;color:#3479e8;font-size:1.35rem;font-weight:800}
.workflow-description{margin:8px 0 0;color:var(--muted,#64748b);text-align:center}
@keyframes flowIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
@media(max-width:700px){.workflow-track{flex-direction:column}.workflow-track>i{transform:rotate(90deg)}.workflow-node{width:100%;flex:auto}}