:root{
  --bg:#05070d; --bg2:#0a0e1a; --card:rgba(255,255,255,.04); --line:rgba(255,255,255,.09);
  --text:#e8eefc; --muted:#8b97b5; --cyan:#22d3ee; --blue:#3b82f6; --glow:rgba(34,211,238,.35);
  --mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --sans:'Inter',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{background:var(--bg);color:var(--text);font-family:var(--sans);line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
::selection{background:var(--cyan);color:#001018}
#bg{position:fixed;inset:0;z-index:-2;width:100%;height:100%}
.spot{position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:radial-gradient(600px circle at var(--mx,50%) var(--my,30%),rgba(34,211,238,.10),transparent 60%)}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}
section{padding:110px 0}
.label{font-family:var(--mono);font-size:.8rem;letter-spacing:.14em;text-transform:uppercase;color:var(--cyan);margin-bottom:12px}
h2{font-size:clamp(1.8rem,4vw,2.7rem);font-weight:800;letter-spacing:-.02em;margin-bottom:14px}
.sub{color:var(--muted);max-width:640px;margin-bottom:48px}
.grad{background:linear-gradient(100deg,#fff 0%,var(--cyan) 55%,var(--blue) 100%);-webkit-background-clip:text;background-clip:text;color:transparent}

/* nav */
nav{position:fixed;top:0;left:0;right:0;z-index:50;backdrop-filter:blur(14px);background:rgba(5,7,13,.65);border-bottom:1px solid var(--line)}
nav .wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-family:var(--mono);font-weight:500;color:var(--cyan)}
.logo b{color:#fff}
.links{display:flex;gap:26px;font-size:.9rem;color:var(--muted)}
.links a{transition:color .2s;position:relative}
.links a:hover,.links a.on{color:#fff}
.links a.on::after{content:"";position:absolute;left:0;right:0;bottom:-8px;height:2px;background:var(--cyan);box-shadow:0 0 10px var(--cyan)}
.burger{display:none;background:none;border:1px solid var(--line);color:#fff;border-radius:8px;padding:6px 10px;font-size:1.1rem;cursor:pointer}

/* hero */
#hero{min-height:100vh;display:flex;align-items:center;padding-top:100px}
.badge{display:inline-flex;gap:10px;align-items:center;font-family:var(--mono);font-size:.78rem;color:var(--muted);
  border:1px solid var(--line);border-radius:99px;padding:7px 14px;background:var(--card);margin-bottom:28px}
.dot{width:8px;height:8px;border-radius:50%;background:#34d399;box-shadow:0 0 0 0 rgba(52,211,153,.7);animation:pulse 2s infinite}
@keyframes pulse{70%{box-shadow:0 0 0 10px rgba(52,211,153,0)}100%{box-shadow:0 0 0 0 rgba(52,211,153,0)}}
h1{font-size:clamp(2.8rem,8vw,6rem);line-height:1.02;font-weight:800;letter-spacing:-.04em}
.role{font-family:var(--mono);font-size:clamp(1rem,2.4vw,1.4rem);margin:26px 0 18px;color:var(--text);min-height:2em}
.role .cur{display:inline-block;width:.6ch;background:var(--cyan);margin-left:2px;animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.lede{color:var(--muted);font-size:1.12rem;max-width:620px}
.cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:38px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 24px;border-radius:12px;font-weight:600;font-size:.95rem;
  border:1px solid var(--line);background:var(--card);transition:.25s;cursor:pointer}
.btn:hover{border-color:var(--cyan);box-shadow:0 0 28px var(--glow);transform:translateY(-2px)}
.btn.pri{background:linear-gradient(120deg,var(--cyan),var(--blue));color:#001018;border:0}
.scroll{position:absolute;bottom:28px;left:50%;transform:translateX(-50%);font-family:var(--mono);font-size:.7rem;color:var(--muted);letter-spacing:.2em}

/* cards */
.grid{display:grid;gap:22px}
.g3{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.g2{grid-template-columns:repeat(auto-fit,minmax(340px,1fr))}
.card{position:relative;background:var(--card);border:1px solid var(--line);border-radius:20px;padding:28px;backdrop-filter:blur(10px);
  transition:transform .25s,border-color .25s,box-shadow .25s;overflow:hidden;transform-style:preserve-3d}
.card::before{content:"";position:absolute;inset:0;background:radial-gradient(400px circle at var(--cx,50%) var(--cy,0%),rgba(34,211,238,.12),transparent 55%);opacity:0;transition:opacity .3s}
.card:hover{border-color:rgba(34,211,238,.5);box-shadow:0 10px 50px rgba(34,211,238,.08)}
.card:hover::before{opacity:1}
.card>*{position:relative}
.card h3{font-size:1.3rem;margin-bottom:6px;font-weight:700}
.tag{font-family:var(--mono);font-size:.72rem;color:var(--cyan);letter-spacing:.1em;text-transform:uppercase;margin-bottom:14px;display:block}
.card p{color:var(--muted);font-size:.97rem}
.arrow{display:inline-block;margin-top:18px;font-family:var(--mono);font-size:.85rem;color:var(--cyan)}
.arrow::after{content:" →";transition:margin .2s}
.card:hover .arrow::after{margin-left:6px}
.soon{display:inline-block;font-family:var(--mono);font-size:.7rem;border:1px solid var(--line);border-radius:6px;padding:2px 8px;color:var(--muted);margin-left:8px;vertical-align:middle}

/* about */
.about{display:grid;grid-template-columns:1.3fr 1fr;gap:44px;align-items:start}
.about p{color:#c3cde6;margin-bottom:18px;font-size:1.05rem}
.term{background:#02040a;border:1px solid var(--line);border-radius:16px;font-family:var(--mono);font-size:.82rem;overflow:hidden}
.term .bar{display:flex;gap:7px;padding:12px 14px;border-bottom:1px solid var(--line);background:rgba(255,255,255,.03)}
.term .bar i{width:11px;height:11px;border-radius:50%;background:#2a3350}
.term pre{padding:18px;white-space:pre-wrap;color:#9fb0d8;line-height:1.8}
.term .k{color:var(--cyan)}.term .s{color:#a5f3a0}.term .c{color:#5a6a92}

/* stats */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:22px;margin-top:10px}
.stat{text-align:center;padding:30px 16px}
.stat .n{font-size:clamp(2.2rem,5vw,3.2rem);font-weight:800;letter-spacing:-.03em}
.stat .d{color:var(--muted);font-size:.88rem;margin-top:4px}

/* chips */
.chips{display:flex;flex-wrap:wrap;gap:10px}
.chip{font-family:var(--mono);font-size:.82rem;padding:8px 14px;border-radius:10px;border:1px solid var(--line);background:var(--card);color:#c3cde6;transition:.2s}
.chip:hover{border-color:var(--cyan);color:#fff;box-shadow:0 0 18px var(--glow);transform:translateY(-2px)}
.skillgroup{margin-bottom:28px}
.skillgroup h4{font-family:var(--mono);font-size:.8rem;color:var(--muted);letter-spacing:.1em;text-transform:uppercase;margin-bottom:12px;font-weight:500}

/* timeline */
.tl{position:relative;padding-left:32px;border-left:1px solid var(--line)}
.tl::before{content:"";position:absolute;left:-1px;top:0;width:1px;height:90px;background:linear-gradient(var(--cyan),transparent)}
.tl-item{position:relative;margin-bottom:40px}
.tl-item::before{content:"";position:absolute;left:-38px;top:8px;width:11px;height:11px;border-radius:50%;background:var(--cyan);box-shadow:0 0 14px var(--cyan)}
.tl-item h3{font-size:1.25rem}
.tl-item .meta{font-family:var(--mono);font-size:.8rem;color:var(--cyan);margin:4px 0 14px}
.tl-item ul{list-style:none;display:grid;gap:10px}
.tl-item li{color:#b7c3e0;padding-left:20px;position:relative;font-size:.97rem}
.tl-item li::before{content:"›";position:absolute;left:0;color:var(--cyan);font-family:var(--mono)}
.edu{display:grid;gap:14px;margin-top:10px}
.edu .card{padding:22px}
.edu h3{font-size:1.05rem}

/* books */
.book{display:flex;gap:18px;align-items:flex-start}
.cover{flex:none;width:64px;height:92px;border-radius:6px;background:linear-gradient(145deg,var(--blue),var(--cyan));display:grid;place-items:center;font-weight:800;font-size:1.4rem;color:#001018;box-shadow:0 8px 24px var(--glow)}
.empty{border:1px dashed var(--line);border-radius:16px;padding:34px;text-align:center;color:var(--muted);font-family:var(--mono);font-size:.9rem}

/* social */
.social{display:flex;flex-wrap:wrap;gap:14px}
.social a{padding:13px 22px;border-radius:12px;border:1px solid var(--line);background:var(--card);font-weight:600;transition:.25s}
.social a:hover{border-color:var(--cyan);box-shadow:0 0 28px var(--glow);transform:translateY(-3px)}

footer{border-top:1px solid var(--line);padding:34px 0;color:var(--muted);font-family:var(--mono);font-size:.78rem;text-align:center}

/* reveal */
.rv{opacity:0;transform:translateY(28px);transition:opacity .8s ease,transform .8s ease}
.rv.in{opacity:1;transform:none}

@media(max-width:820px){
  .about{grid-template-columns:1fr}
  .links{display:none;position:absolute;top:64px;left:0;right:0;flex-direction:column;background:rgba(5,7,13,.97);padding:20px 24px;gap:18px;border-bottom:1px solid var(--line)}
  .links.open{display:flex}
  .burger{display:block}
  section{padding:80px 0}
}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  .rv{opacity:1;transform:none}
}


/* engineering grid (behind particles) */
.eng-grid{position:fixed;inset:0;z-index:-3;pointer-events:none;
  background-image:
    linear-gradient(rgba(34,211,238,.30) 1px,transparent 1px),
    linear-gradient(90deg,rgba(34,211,238,.30) 1px,transparent 1px),
    linear-gradient(rgba(34,211,238,.12) 1px,transparent 1px),
    linear-gradient(90deg,rgba(34,211,238,.12) 1px,transparent 1px);
  background-size:120px 120px,120px 120px,24px 24px,24px 24px;
  background-position:-1px -1px,-1px -1px,-1px -1px,-1px -1px;
  -webkit-mask-image:radial-gradient(ellipse 85% 75% at 50% 40%,#000 35%,rgba(0,0,0,.25) 100%);
  mask-image:radial-gradient(ellipse 85% 75% at 50% 40%,#000 35%,rgba(0,0,0,.25) 100%)}
.eng-grid::after{content:"";position:absolute;inset:0;
  background:
    linear-gradient(var(--cyan),var(--cyan)) 0 0/14px 1px no-repeat,
    linear-gradient(var(--cyan),var(--cyan)) 0 0/1px 14px no-repeat;opacity:.0}

/* symmetry: explicit equal-column grids */
.center-head{text-align:center}
.center-head .sub{margin-left:auto;margin-right:auto}
.g2e{display:grid;gap:22px;grid-template-columns:repeat(2,1fr)}
.g3e{display:grid;gap:22px;grid-template-columns:repeat(3,1fr)}
.wide{grid-column:1/-1}
.stats{grid-template-columns:repeat(4,1fr)}
.chips{justify-content:center}
.skillgroup{text-align:center}
.social{display:grid;gap:14px;grid-template-columns:repeat(var(--n,3),1fr)}
.social a{text-align:center}
.card{display:flex;flex-direction:column}
.card .arrow{margin-top:auto;padding-top:18px}
.page{min-height:100vh;display:flex;align-items:center;padding:120px 0 80px}
.page .wrap{max-width:820px;text-align:center}
.page .lede{margin-left:auto;margin-right:auto}
.page .cta{justify-content:center}
.back{display:inline-block;margin-bottom:34px;font-family:var(--mono);font-size:.85rem;color:var(--muted)}
.back:hover{color:var(--cyan)}
@media(max-width:900px){.g3e{grid-template-columns:1fr}.stats{grid-template-columns:repeat(2,1fr)}}
@media(max-width:700px){.g2e{grid-template-columns:1fr}.social{grid-template-columns:1fr}}
.label,h2,.sub{text-align:center}
.sub{margin-left:auto;margin-right:auto}
.card{text-align:left}

/* real book covers */
.cover{width:84px;height:124px;overflow:hidden;background:#0b1224;padding:0}
.cover img{width:100%;height:100%;object-fit:cover;object-position:top;display:block}
.card:hover .cover{box-shadow:0 10px 30px var(--glow)}

/* profile picture */
.hero-name{display:flex;align-items:center;gap:clamp(12px,2vw,22px)}
.avatar{flex:none;width:clamp(84px,11vw,140px);height:clamp(84px,11vw,140px);aspect-ratio:1;border-radius:50%;object-fit:cover;object-position:50% 50%;
  border:2px solid var(--cyan);box-shadow:0 0 0 6px rgba(34,211,238,.10),0 0 40px var(--glow)}
@media(max-width:560px){.hero-name{flex-direction:column;align-items:flex-start}}