/* ============ Tokens ============ */
:root{
  --accent:#2dd4bf; --accent-rgb:45,212,191;
  --accent2:#7c9cff;
  --accent-soft:rgba(45,212,191,.10);
  --accent-border:rgba(45,212,191,.28);
  --bg:#06080b; --text:#e9edf4; --text-strong:#fff;
  --muted:#aeb6c4; --muted2:#9aa3b2; --faint:#7c8595;
  --border:rgba(255,255,255,.10); --border-soft:rgba(255,255,255,.07);
  --chip-bg:rgba(255,255,255,.04);
  --card-top:rgba(255,255,255,.05); --card-bot:rgba(255,255,255,.012);
  --surface:rgba(255,255,255,.03);
  --band:rgba(255,255,255,.018);
  --nav-bg:rgba(6,8,11,.62);
  --hero-top:rgba(6,8,11,.12); --hero-bot:rgba(6,8,11,.86);
  --shadow:rgba(0,0,0,.6);
  --btn-on-accent:#06080b;
  --maxw:1160px;
}
[data-theme="light"]{
  --accent:#0d9488; --accent-rgb:13,148,136;
  --accent2:#4f6bd8;
  --accent-soft:rgba(13,148,136,.10);
  --accent-border:rgba(13,148,136,.32);
  --bg:#f4f6f8; --text:#1b212b; --text-strong:#0a0d12;
  --muted:#414b59; --muted2:#566071; --faint:#727c8b;
  --border:rgba(12,18,28,.12); --border-soft:rgba(12,18,28,.08);
  --chip-bg:rgba(12,18,28,.04);
  --card-top:#fff; --card-bot:#eef1f5;
  --surface:rgba(255,255,255,.55);
  --band:rgba(12,18,28,.028);
  --nav-bg:rgba(244,246,248,.8);
  --hero-top:rgba(244,246,248,.06); --hero-bot:rgba(244,246,248,.72);
  --shadow:rgba(30,40,60,.14);
}

/* ============ Base ============ */
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--bg); color:var(--text);
  font-family:"Manrope",system-ui,sans-serif;
  font-size:clamp(16px,1.6vw,19px); line-height:1.7;
  -webkit-font-smoothing:antialiased;
  transition:background .4s ease,color .4s ease;
  overflow-x:hidden;
}
h1,h2,h3,.brand{font-family:"Space Grotesk",system-ui,sans-serif;color:var(--text-strong)}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
section{scroll-margin-top:90px}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 clamp(18px,4vw,48px)}
.mono{font-family:"JetBrains Mono",monospace}

/* ============ Nav ============ */
.nav{position:fixed;top:0;left:0;right:0;z-index:50;
  background:var(--nav-bg);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid var(--border-soft)}
.nav-inner{max-width:1280px;margin:0 auto;padding:0 clamp(18px,4vw,48px);
  height:64px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{font-weight:600;font-size:16px;letter-spacing:-.01em;white-space:nowrap}
.navlinks{display:flex;gap:26px}
.navlinks a{font-size:14px;color:var(--muted);transition:color .2s}
.navlinks a:hover{color:var(--text-strong)}
.nav-right{display:flex;align-items:center;gap:10px}
.icon-btn{width:38px;height:38px;border-radius:50%;border:1px solid var(--border);
  background:var(--chip-bg);color:var(--text);display:grid;place-items:center;cursor:pointer;
  transition:border-color .2s,color .2s}
.icon-btn:hover{border-color:var(--accent);color:var(--accent)}
.lang-btn{height:38px;padding:0 14px;border-radius:999px;border:1px solid var(--border);
  background:var(--chip-bg);color:var(--text);font-family:"JetBrains Mono",monospace;
  font-size:13px;cursor:pointer;transition:border-color .2s,color .2s}
.lang-btn:hover{border-color:var(--accent);color:var(--accent)}
.menu-btn{display:none}

/* ============ Buttons ============ */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:12px;font-weight:600;font-size:15px;cursor:pointer;
  border:1px solid transparent;transition:transform .25s,border-color .25s,background .25s,box-shadow .25s}
.btn-accent{background:var(--accent);color:var(--btn-on-accent);border-radius:999px}
.btn-accent:hover{transform:translateY(-2px);box-shadow:0 10px 30px var(--accent-soft)}
.btn-outline{border-color:var(--border);background:var(--chip-bg);color:var(--text)}
.btn-outline:hover{transform:translateY(-2px);border-color:var(--accent);color:var(--accent)}
.nav-contact{padding:9px 18px;font-size:14px}

/* ============ Drawer ============ */
.drawer{position:fixed;top:64px;left:0;right:0;z-index:49;display:flex;flex-direction:column;gap:4px;
  padding:18px clamp(18px,4vw,48px) 26px;background:var(--nav-bg);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid var(--border-soft)}
.drawer[hidden]{display:none}
.drawer a{padding:12px 4px;color:var(--muted);font-size:16px;border-bottom:1px solid var(--border-soft)}
.drawer a.btn{margin-top:14px;border-bottom:none}

/* ============ Eyebrow / shared ============ */
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:"JetBrains Mono",monospace;
  font-size:12px;text-transform:uppercase;letter-spacing:.22em;color:var(--accent);margin-bottom:18px}
.pill{padding:7px 14px;border:1px solid var(--accent-border);border-radius:999px;background:var(--accent-soft)}
.dot{width:7px;height:7px;border-radius:50%;background:var(--accent);flex:none}
.grad{background:linear-gradient(100deg,var(--accent),var(--accent2));
  -webkit-background-clip:text;background-clip:text;color:transparent}
.section{padding:clamp(80px,11vh,140px) 0}
.center-head{max-width:760px;margin:0 auto;text-align:center}
.left-head{max-width:760px}
.center-head h2,.left-head h2,.section h2{font-size:clamp(28px,4vw,46px);font-weight:600;letter-spacing:-.02em;line-height:1.08}
.intro{color:var(--muted);margin-top:18px}
.band{background:var(--band)}
.band-indigo{background:linear-gradient(180deg,transparent,rgba(124,156,255,.045),transparent)}

/* ============ Hero ============ */
.hero{position:relative;min-height:100vh;display:flex;flex-direction:column;justify-content:center;
  padding:90px 0 60px;overflow:hidden}
.hero-canvas{position:absolute;inset:0;width:100%;height:100%}
.hero-overlay{position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(60% 50% at 85% 8%,rgba(124,156,255,.10),transparent 60%),
    radial-gradient(55% 50% at 8% 92%,rgba(var(--accent-rgb),.10),transparent 60%),
    linear-gradient(180deg,var(--hero-top),var(--hero-bot))}
.hero-content{position:relative;z-index:2;text-align:left}
.hero-h1{font-size:clamp(38px,6.6vw,82px);font-weight:700;line-height:1.03;letter-spacing:-.03em;
  max-width:17ch;margin:22px 0}
.hero-h1 span{display:block}
.hero-sub{max-width:62ch;color:var(--muted);font-size:clamp(16px,1.7vw,19px)}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-top:30px}
.hero-cta.center{justify-content:center}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:54px;
  padding-top:30px;border-top:1px solid var(--border)}
.stat{display:flex;flex-direction:column;gap:6px}
.stat-num{font-family:"Space Grotesk";font-size:clamp(30px,4vw,46px);font-weight:700;line-height:1;
  background:linear-gradient(120deg,var(--text-strong),var(--accent));
  -webkit-background-clip:text;background-clip:text;color:transparent}
.stat-label{font-size:13px;color:var(--faint)}
.scroll-hint{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);z-index:2;
  display:flex;flex-direction:column;align-items:center;gap:10px;
  font-family:"JetBrains Mono",monospace;font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--faint)}
.mouse{width:20px;height:32px;border:1.5px solid var(--faint);border-radius:12px;position:relative}
.wheel{position:absolute;top:6px;left:50%;width:3px;height:6px;border-radius:2px;background:var(--accent);
  transform:translateX(-50%);animation:wheel 1.6s ease-in-out infinite}
@keyframes wheel{0%{opacity:0;top:6px}40%{opacity:1}80%{opacity:0;top:16px}100%{opacity:0}}

/* ============ About ============ */
.about-grid{display:grid;grid-template-columns:.9fr 1.4fr;gap:clamp(30px,5vw,64px);align-items:start}
.portrait{position:relative}
.portrait img{width:100%;aspect-ratio:4/5;object-fit:cover;object-position:center top;border-radius:20px;position:relative;z-index:1}
.portrait-frame{position:absolute;inset:-1px;border-radius:21px;z-index:0;filter:blur(2px);opacity:.5;
  background:linear-gradient(140deg,var(--accent),var(--accent2))}
.portrait-badge{position:absolute;z-index:2;left:14px;bottom:14px;right:14px;display:flex;align-items:center;gap:9px;
  padding:10px 14px;border-radius:12px;background:var(--surface);border:1px solid var(--border);
  backdrop-filter:blur(10px);font-size:13px;color:var(--text)}
.about-text .lead{margin-top:18px;color:var(--text)}
.about-text p{margin-top:16px;color:var(--muted)}
.pillars{margin-top:30px;display:grid;gap:14px}
.pillar{padding:18px 20px;border-radius:16px;border:1px solid var(--border);
  background:linear-gradient(180deg,var(--card-top),var(--card-bot));transition:border-color .3s,transform .3s}
.pillar:hover{border-color:var(--accent);transform:translateY(-4px)}
.pillar h3{font-size:17px;margin-bottom:6px}
.pillar p{color:var(--muted);font-size:15px;margin:0}

/* ============ Frameworks ============ */
.fw-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:22px;margin-top:54px}
.fw-card{position:relative;overflow:hidden;padding:36px 32px;border-radius:22px;border:1px solid var(--border);
  background:linear-gradient(180deg,var(--card-top),var(--card-bot));transition:border-color .3s,transform .3s}
.fw-card:hover{border-color:var(--accent);transform:translateY(-4px)}
.watermark{position:absolute;top:-18px;right:6px;font-family:"Space Grotesk";font-weight:700;
  font-size:140px;line-height:1;color:var(--text-strong);opacity:.04;pointer-events:none}
.tag{display:inline-flex;align-items:center;font-family:"JetBrains Mono",monospace;font-size:11.5px;
  padding:5px 12px;border-radius:999px;letter-spacing:.04em}
.tag-accent{background:var(--accent-soft);border:1px solid var(--accent-border);color:var(--accent)}
.tag-dashed{background:transparent;border:1px dashed var(--border);color:var(--faint)}
.fw-card h3{font-size:clamp(22px,2.6vw,30px);margin:18px 0 8px}
.fw-card .tagline{color:var(--accent2);font-weight:600;margin-bottom:14px}
.fw-card>p:last-child{color:var(--muted)}
.fw-note{text-align:center;color:var(--faint);font-size:14px;margin-top:34px}
.mono-prefix{font-family:"JetBrains Mono",monospace;color:var(--accent)}

/* ============ Impact ============ */
.impact-grid{display:grid;grid-template-columns:.95fr 1.25fr;gap:clamp(30px,5vw,60px);align-items:start}
.nda-note{display:flex;align-items:center;gap:10px;margin-top:24px;padding:14px 18px;border-radius:12px;
  border:1px dashed var(--border);color:var(--muted);font-size:14px}
.nda-note svg{color:var(--accent);flex:none}
.impact-rows{display:grid;gap:16px}
.impact-row{display:flex;gap:18px;align-items:flex-start;padding:22px 24px;border-radius:18px;
  border:1px solid var(--border);background:linear-gradient(180deg,var(--card-top),var(--card-bot));
  transition:border-color .3s,transform .3s}
.impact-row:hover{border-color:var(--accent);transform:translateX(4px)}
.icon-tile{width:46px;height:46px;border-radius:12px;flex:none;display:grid;place-items:center;
  background:var(--accent-soft);border:1px solid var(--accent-border);color:var(--accent)}
.impact-row h3{font-size:18px;margin-bottom:4px}
.impact-row p{color:var(--muted);font-size:15px;margin:0}

/* ============ Building ============ */
.build-list{display:grid;gap:18px;max-width:1000px;margin:54px auto 0}
.build-card{display:grid;grid-template-columns:64px 1fr;gap:20px;padding:28px 30px;border-radius:20px;
  border:1px solid var(--border);background:linear-gradient(180deg,var(--card-top),var(--card-bot));
  transition:border-color .3s,transform .3s}
.build-card:hover{border-color:var(--accent);transform:translateY(-4px)}
.build-num{font-family:"Space Grotesk";font-weight:700;font-size:40px;color:var(--accent);line-height:1}
.build-head{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:10px}
.build-head h3{font-size:clamp(20px,2.4vw,26px)}
.build-body>p{color:var(--muted)}
.build-link{display:inline-block;margin-top:14px;color:var(--accent);font-weight:600;font-size:15px;
  font-family:"JetBrains Mono",monospace;transition:opacity .2s}
.build-link:hover{opacity:.7}

/* ============ Timeline ============ */
.timeline{max-width:1000px;margin:54px auto 0;position:relative;padding-left:32px;
  border-left:1px solid var(--border)}
.tl-item{position:relative;padding:0 0 44px 16px}
.tl-item:last-child{padding-bottom:0}
.tl-dot{position:absolute;left:-41px;top:4px;width:11px;height:11px;border-radius:50%;
  background:var(--accent);box-shadow:0 0 0 4px var(--bg)}
.tl-period{font-family:"JetBrains Mono",monospace;font-size:12px;color:var(--accent);letter-spacing:.06em}
.tl-company{font-size:20px;margin:8px 0 2px}
.tl-sub{font-weight:400;color:var(--faint);font-size:15px;font-family:"Manrope"}
.tl-role{font-weight:600;color:var(--text);margin-bottom:8px}
.tl-item>p{color:var(--muted);font-size:15.5px}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.chips span{font-family:"JetBrains Mono",monospace;font-size:11.5px;padding:4px 10px;border-radius:999px;
  border:1px solid var(--border);background:var(--chip-bg);color:var(--muted2)}

/* ============ Skills ============ */
.skills-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:18px;margin-top:54px}
.skill-cat{padding:24px 26px;border-radius:18px;border:1px solid var(--border);
  background:linear-gradient(180deg,var(--card-top),var(--card-bot))}
.skill-cat h3{font-size:14px;color:var(--accent);font-family:"JetBrains Mono",monospace;
  text-transform:uppercase;letter-spacing:.12em;margin-bottom:16px}
.skill-items{display:flex;flex-wrap:wrap;gap:8px}
.skill-items span{font-size:13px;padding:6px 13px;border-radius:999px;border:1px solid var(--border);
  background:var(--chip-bg);color:var(--text);transition:border-color .2s,color .2s}
.skill-items span:hover{border-color:var(--accent);color:var(--accent)}

/* ============ Research ============ */
.research-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:clamp(30px,5vw,60px);align-items:center}
.research-fig{border-radius:18px;overflow:hidden;border:1px solid var(--border);background:#fff}
.research-fig img{width:100%}
.research-fig figcaption{padding:12px 16px;font-size:12px;color:var(--faint);background:var(--card-bot);
  border-top:1px solid var(--border)}
.pubs-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:18px;margin-top:48px}
.pub-card{padding:24px 26px;border-radius:18px;border:1px solid var(--border);
  background:linear-gradient(180deg,var(--card-top),var(--card-bot));transition:border-color .3s,transform .3s;
  display:flex;flex-direction:column}
.pub-card:hover{border-color:var(--accent);transform:translateY(-4px)}
.pub-type{font-family:"JetBrains Mono",monospace;font-size:11.5px;color:var(--accent2);
  text-transform:uppercase;letter-spacing:.1em;margin-bottom:10px}
.pub-card h3{font-size:18px;line-height:1.3;margin-bottom:10px}
.pub-card p{color:var(--muted);font-size:14.5px;flex:1}
.pub-meta{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:16px;
  font-family:"JetBrains Mono",monospace;font-size:12px;color:var(--faint)}
.pub-meta a{color:var(--accent);font-weight:600}

/* ============ Education ============ */
.edu-wrap{display:grid;grid-template-columns:1fr 1fr;gap:clamp(34px,5vw,64px);align-items:start}
.edu-wrap h2{font-size:clamp(24px,3vw,34px)}
.edu-grid{display:grid;gap:16px;margin-top:24px}
.edu-card{padding:22px 24px;border-radius:18px;border:1px solid var(--border);
  background:linear-gradient(180deg,var(--card-top),var(--card-bot))}
.edu-card .tag{margin-bottom:12px}
.edu-card h3{font-size:18px;margin-bottom:4px}
.edu-school{color:var(--accent2);font-size:14px;font-weight:600;margin-bottom:8px}
.edu-card>p:last-child{color:var(--muted);font-size:14.5px;margin:0}
.cert-list{display:grid;gap:10px;margin-top:24px}
.cert-card{display:flex;gap:14px;align-items:flex-start;padding:16px 20px;border-radius:14px;
  border:1px solid var(--border);background:var(--chip-bg)}
.cert-card .dot{margin-top:9px}
.cert-card h3{font-size:15.5px;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.cert-card p{color:var(--muted);font-size:14px;margin-top:2px}
.cert-card .edu-school{margin-bottom:0}
.inprog{font-size:10.5px;padding:3px 9px}

/* ============ References ============ */
.refs-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(290px,1fr));gap:18px;margin-top:54px}
.ref-card{position:relative;padding:30px 28px 26px;border-radius:20px;border:1px solid var(--border);
  background:linear-gradient(180deg,var(--card-top),var(--card-bot));transition:border-color .3s,transform .3s}
.ref-card:hover{border-color:var(--accent);transform:translateY(-4px)}
.quote-mark{position:absolute;top:8px;left:22px;font-family:"Space Grotesk";font-weight:700;font-size:64px;
  color:var(--accent);opacity:.25;line-height:1}
.ref-card blockquote{position:relative;color:var(--text);font-size:15px;line-height:1.6;margin:26px 0 18px}
.ref-card figcaption{display:flex;flex-direction:column;gap:2px}
.ref-card figcaption strong{font-family:"Space Grotesk";font-weight:600;color:var(--text-strong)}
.ref-card figcaption span{font-size:13px;color:var(--faint)}

/* ============ Contact ============ */
.contact{position:relative;overflow:hidden}
.contact-glow{position:absolute;top:-10%;left:50%;transform:translateX(-50%);width:700px;height:400px;
  background:radial-gradient(50% 50% at 50% 50%,var(--accent-soft),transparent 70%);pointer-events:none}
.contact-line{margin-top:30px;color:var(--muted2);display:flex;gap:14px;justify-content:center;flex-wrap:wrap;font-size:13px}
.contact-line .sep{color:var(--faint)}

/* ============ Footer ============ */
.footer{border-top:1px solid var(--border-soft);padding:30px 0}
.footer-inner{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;
  color:var(--faint);font-size:13px}

/* ============ Pointer glow ============ */
.pointer-glow{position:fixed;inset:0;z-index:1;pointer-events:none;mix-blend-mode:screen;
  background:radial-gradient(600px circle at var(--mx,-100px) var(--my,-100px),rgba(var(--accent-rgb),.05),transparent 60%);
  opacity:0;transition:opacity .4s}
@media(hover:hover){.pointer-glow{opacity:1}}

/* ============ Reveal ============ */
.reveal{opacity:0;transform:translateY(30px);transition:opacity .9s cubic-bezier(.2,.7,.2,1),transform .9s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

/* ============ Responsive ============ */
@media(max-width:900px){
  .navlinks{display:none}
  .nav-contact{display:none}
  .menu-btn{display:grid}
  .about-grid,.impact-grid,.research-grid,.edu-wrap{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr);gap:20px}
  .build-card{grid-template-columns:1fr;gap:8px}
}
@media(prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
  .wheel{animation:none}
}