:root{--paper:#F1F5F4;--card:#FFFFFF;--ink:#10303A;--muted:#4F6B73;--line:#CBD8D8;--heat:#E4572E;--cool:#2B6CB0;--max:1040px}
:root[data-theme="dark"]{--paper:#0D1B20;--card:#142830;--ink:#E6EFEF;--muted:#9DB5BA;--line:#27414A;--heat:#FF7A52;--cool:#6FB1F0}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--paper:#0D1B20;--card:#142830;--ink:#E6EFEF;--muted:#9DB5BA;--line:#27414A;--heat:#FF7A52;--cool:#6FB1F0}}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{background:var(--paper);color:var(--ink);font:400 17px/1.65 "IBM Plex Sans",system-ui,sans-serif}
a{color:var(--ink);text-decoration-color:var(--heat);text-underline-offset:3px}
a:hover{color:var(--heat)}
:focus-visible{outline:3px solid var(--cool);outline-offset:3px}
h1,h2,h3{font-family:"Bricolage Grotesque",sans-serif;line-height:1.12}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}

/* nav */
.nav{position:sticky;top:0;z-index:10;background:color-mix(in srgb,var(--paper) 92%,transparent);backdrop-filter:blur(6px);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;justify-content:space-between;height:60px;gap:16px}
.brand{font:700 1.05rem "Bricolage Grotesque",sans-serif;text-decoration:none}
#menu{display:flex;gap:22px;margin-left:auto;font-size:.95rem}
#menu a{text-decoration:none;padding:4px 0;border-bottom:2px solid transparent}
#menu a.active{border-bottom-color:var(--heat)}
.tools{display:flex;gap:6px}
.icon{background:none;border:1px solid var(--line);color:var(--ink);width:38px;height:38px;border-radius:8px;font-size:1.1rem;cursor:pointer}
.icon:hover{border-color:var(--heat)}
.burger{display:none}

/* hero */
.hero{padding:72px 0 56px}
.grid{display:grid;grid-template-columns:1.25fr 1fr;gap:48px;align-items:center}
.hero h1{font-size:clamp(2.6rem,6vw,4.4rem);font-weight:800;letter-spacing:-.02em}
.lead{margin-top:22px;font-size:1.15rem;color:var(--muted);max-width:34em}
.actions{margin-top:28px;display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-block;padding:11px 20px;border-radius:6px;font-weight:500;text-decoration:none;border:1.5px solid var(--ink)}
.btn:hover{border-color:var(--heat)}
.btn.primary{background:var(--ink);color:var(--paper)}
.btn.primary:hover{background:var(--heat);border-color:var(--heat);color:#fff}
.facts{display:flex;gap:32px;margin-top:36px;flex-wrap:wrap}
.facts dt{font:700 1.6rem "Bricolage Grotesque",sans-serif}
.facts dd{font-size:.88rem;color:var(--muted)}
.scan{margin:0}
.scan svg{width:100%;height:auto;display:block;border-radius:50%;box-shadow:0 0 0 1px var(--line)}
.scan figcaption{margin-top:12px;font-size:.88rem;color:var(--muted);text-align:center}

/* sections */
section,footer{padding:64px 0;border-top:1px solid var(--line)}
h2{font-size:clamp(1.7rem,3.2vw,2.3rem);letter-spacing:-.01em}
.two{display:grid;grid-template-columns:200px 1fr;gap:32px}
.intro{margin-bottom:28px;max-width:42em}
.pub{padding:18px 0;border-bottom:1px solid var(--line)}
.pub h3{font-size:1.15rem}
.pub p{color:var(--muted);font-size:.95rem;margin-top:6px}
.tag{display:inline-block;font-size:.82rem;color:var(--cool);border:1px solid var(--cool);border-radius:99px;padding:1px 10px;margin:8px 6px 0 0}
.filters{display:flex;gap:8px;margin-bottom:20px;flex-wrap:wrap}
.chip{background:none;border:1px solid var(--line);color:var(--ink);border-radius:99px;padding:5px 14px;font:inherit;font-size:.9rem;cursor:pointer}
.chip:hover{border-color:var(--heat)}
.chip.active{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.project{padding:22px 0;border-bottom:1px solid var(--line)}
.project[hidden]{display:none}
.project h3{font-size:1.3rem}
.meta{color:var(--muted);font-size:.9rem;margin-top:4px}
.project p{margin-top:10px;max-width:42em}
.timeline .item{padding-left:20px;border-left:2px solid var(--line);margin-bottom:24px}
.timeline h3{font-size:1.1rem}
.timeline p{margin-top:6px}
.skills{display:grid;grid-template-columns:170px 1fr;gap:14px 24px}
.skills dt{font-weight:500}
.skills dd{color:var(--muted)}
.mail{font-size:1.2rem}
.mail .chip{margin-left:8px;vertical-align:middle}
.links{list-style:none;display:flex;gap:20px;flex-wrap:wrap;margin-top:16px}
.small{margin-top:32px;color:var(--muted);font-size:.88rem}

@media (max-width:760px){
  .grid,.two{grid-template-columns:1fr}
  .two{gap:16px}
  .scan{max-width:320px}
  .burger{display:inline-block}
  #menu{display:none;position:absolute;top:60px;left:0;right:0;flex-direction:column;gap:0;background:var(--paper);border-bottom:1px solid var(--line);padding:8px 24px 16px}
  #menu.open{display:flex}
  #menu a{padding:10px 0}
  .skills{grid-template-columns:1fr;gap:2px}
  .skills dd{margin-bottom:12px}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* ---------- v3: photo, motion, polish ---------- */
#progress{position:fixed;top:0;left:0;height:3px;width:0;background:linear-gradient(90deg,var(--cool),#3FA796,#F2B134,var(--heat));z-index:20}
.hero{position:relative;overflow:hidden}
.glow{position:absolute;inset:0;pointer-events:none;background:radial-gradient(520px circle at var(--mx,70%) var(--my,30%),color-mix(in srgb,var(--heat) 16%,transparent),transparent 70%);transition:background .2s}
.hero .wrap{position:relative}
.hello{color:var(--muted);margin-bottom:6px}
.role{margin-top:14px;font:700 clamp(1.2rem,2.6vw,1.6rem) "Bricolage Grotesque",sans-serif;color:var(--cool);min-height:1.4em}
.caret{display:inline-block;width:2px;height:1.1em;background:var(--heat);margin-left:3px;vertical-align:-.15em;animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.lead{margin-top:16px}

.photo{margin:0;justify-self:center;width:min(100%,380px);perspective:900px}
.ring{padding:7px;border-radius:50%;background:conic-gradient(from var(--a,0deg),var(--cool),#3FA796,#F2B134,var(--heat),var(--cool));animation:spin 8s linear infinite;transition:transform .15s;transform-style:preserve-3d;box-shadow:0 20px 50px -20px color-mix(in srgb,var(--heat) 55%,transparent)}
@property --a{syntax:"<angle>";inherits:false;initial-value:0deg}
@keyframes spin{to{--a:360deg}}
.frame{position:relative;aspect-ratio:1;border-radius:50%;overflow:hidden;background:var(--card);border:6px solid var(--paper)}
.frame img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.initials{position:absolute;inset:0;display:grid;place-items:center;font:800 5.5rem "Bricolage Grotesque",sans-serif;color:var(--ink);background:radial-gradient(circle at 40% 35%,color-mix(in srgb,var(--heat) 30%,var(--card)),var(--card))}
.photo figcaption{margin-top:16px;text-align:center;color:var(--muted);font-size:.9rem}

.facts div{padding:10px 16px;border:1px solid var(--line);border-radius:10px;background:var(--card)}

/* reveal on scroll, only when JS is on */
.js .reveal{opacity:0;transform:translateY(22px);transition:opacity .6s ease,transform .6s ease}
.js .reveal.in{opacity:1;transform:none}

/* cards */
.pub,.project{padding:20px 22px;margin-bottom:14px;background:var(--card);border:1px solid var(--line);border-radius:12px;transition:transform .2s,border-color .2s,box-shadow .2s}
.pub:hover,.project:hover{transform:translateY(-3px);border-color:var(--heat);box-shadow:0 12px 28px -18px var(--ink)}
.timeline .item{transition:border-color .2s}
.timeline .item:hover{border-left-color:var(--heat)}
.skills dd{display:flex;flex-wrap:wrap;gap:8px}
.skills dd span{border:1px solid var(--line);background:var(--card);border-radius:99px;padding:2px 12px;font-size:.9rem;color:var(--ink);transition:.2s}
.skills dd span:hover{border-color:var(--heat);transform:translateY(-2px)}
.to-top{position:fixed;right:18px;bottom:18px;width:44px;height:44px;border-radius:50%;border:1px solid var(--line);background:var(--card);color:var(--ink);font-size:1.2rem;cursor:pointer;opacity:0;pointer-events:none;transition:opacity .2s}
.to-top.show{opacity:1;pointer-events:auto}

@media (max-width:760px){.photo{width:min(78%,300px);order:-1}}
@media (prefers-reduced-motion:reduce){.ring{animation:none}.caret{animation:none}.js .reveal{opacity:1;transform:none;transition:none}}

/* ---------- v4: hero text, social links, education cards ---------- */
.accent{background:linear-gradient(100deg,var(--cool),#3FA796 45%,var(--heat));-webkit-background-clip:text;background-clip:text;color:transparent}
.title{margin-top:12px;font:500 1.2rem "Bricolage Grotesque",sans-serif;color:var(--muted)}
.role{margin-top:10px;font:500 1.05rem "IBM Plex Sans",sans-serif;color:var(--ink);min-height:1.6em}
.role .pre{color:var(--muted)}
#typed{font-weight:500;color:var(--cool)}
.social{list-style:none;display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
.social a{display:inline-flex;align-items:center;gap:8px;text-decoration:none;font-size:.9rem;padding:5px 14px 5px 6px;border:1px solid var(--line);border-radius:99px;background:var(--card);transition:.2s}
.social a:hover{border-color:var(--heat);transform:translateY(-2px)}
.social b{display:grid;place-items:center;min-width:26px;height:26px;border-radius:50%;background:var(--ink);color:var(--paper);font:700 .72rem "IBM Plex Sans",sans-serif}
footer .social{margin-top:16px}
h2.center{text-align:center}
h2.center::after{content:"";display:block;width:44px;height:3px;margin:12px auto 0;background:var(--heat);border-radius:2px}
.edu-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:20px;margin-top:36px}
.edu-card{padding:24px;background:var(--card);border:1px solid var(--line);border-radius:12px;transition:transform .2s,border-color .2s,box-shadow .2s}
.edu-card:hover{transform:translateY(-4px);border-color:var(--heat);box-shadow:0 14px 30px -18px var(--ink)}
.edu-card h3{font-size:1.2rem}
.edu-card .school{margin-top:8px;color:var(--cool);font-weight:500}
.edu-card .meta{margin:6px 0}
.edu-card .gpa{font-weight:500;margin-bottom:8px}
.edu-card p:last-child{font-size:.95rem;color:var(--muted)}
.edu-card .gpa + p{font-size:.95rem;color:var(--muted)}

/* ---------- v5: richer education cards and contact form ---------- */
.edu-card .desc{margin-top:4px;font-size:.95rem;color:var(--muted)}
.edu-card p.act{margin-top:12px;padding-top:12px;border-top:1px dashed var(--line);font-size:.9rem;color:var(--ink)}
.form{display:grid;gap:14px;max-width:640px;margin-bottom:28px}
.form .row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form label{display:grid;gap:6px;font-size:.88rem;color:var(--muted)}
.form input,.form textarea{font:inherit;font-size:1rem;color:var(--ink);background:var(--card);border:1px solid var(--line);border-radius:8px;padding:11px 13px;width:100%;resize:vertical;transition:border-color .2s,box-shadow .2s}
.form input:focus,.form textarea:focus{outline:none;border-color:var(--cool);box-shadow:0 0 0 3px color-mix(in srgb,var(--cool) 25%,transparent)}
.form .invalid{border-color:var(--heat)}
.form .hp{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}
.send{cursor:pointer;font:inherit;font-weight:500;padding:13px 20px}
.send:disabled{opacity:.6;cursor:wait}
.status{min-height:1.4em;font-size:.95rem;color:var(--muted)}
.status.ok{color:#2E8B57}.status.err{color:var(--heat)}
@media (max-width:760px){.form .row{grid-template-columns:1fr}}

/* certificate verify link */
.verify{display:inline-block;margin-top:14px;padding:6px 14px;border:1px solid var(--cool);border-radius:99px;color:var(--cool);font-size:.9rem;font-weight:500;text-decoration:none;transition:.2s}
.verify:hover{background:var(--cool);color:var(--paper)}

/* certificate cards */
.cert .thumb{display:block;margin:-6px -6px 16px;border-radius:8px;overflow:hidden;border:1px solid var(--line);background:#fff}
.cert .thumb img{display:block;width:100%;height:auto;transition:transform .3s}
.cert .thumb:hover img{transform:scale(1.03)}
.cert .serial{margin-top:12px;font-size:.88rem;display:flex;flex-wrap:wrap;align-items:center;gap:8px;color:var(--muted)}
.cert .serial code{font:500 .85rem ui-monospace,Consolas,monospace;color:var(--ink);background:var(--paper);border:1px solid var(--line);border-radius:6px;padding:2px 8px;word-break:break-all}
.cert .serial .chip{padding:2px 12px;font-size:.82rem}
.cert-links{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.cert-links .verify{margin-top:0}

/* ---------- v8: brand icons ---------- */
.social a{padding:5px 14px 5px 5px}
.social .ic{display:grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--brand,var(--ink));color:#fff;font-size:.95rem;flex:none}
.social a:hover{border-color:var(--brand,var(--heat))}
.b-orcid{--brand:#A6CE39}
.b-scholar{--brand:#4285F4}
.b-github .ic{background:var(--ink);color:var(--paper)}
.b-linkedin{--brand:#0A66C2}
.b-rg{--brand:#00B8A9}
.b-email{--brand:#EA4335}
.btn i{margin-right:6px}

/* ---------- v9: CV cards, certificate note ---------- */
.cert .note{margin-top:10px;font-size:.8rem;color:var(--muted);font-style:italic}
.cv-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px}
.cv-card{padding:22px;background:var(--card);border:1px solid var(--line);border-radius:12px;transition:transform .2s,border-color .2s}
.cv-card:hover{transform:translateY(-3px);border-color:var(--heat)}
.cv-card h3{font-size:1.2rem}
.cv-card p{margin:8px 0 16px;color:var(--muted);font-size:.95rem}

/* placeholder when a certificate image is missing */
.cert .thumb.noimg{display:grid;place-items:center;height:150px;background:var(--paper);border-style:dashed}
.cert .thumb.noimg::before{content:"\f559";font:900 2.6rem "Font Awesome 6 Free";color:var(--cool)}

/* ---------- v12: full photo, neural hero, certificates filter + lightbox ---------- */
.hero canvas{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;opacity:.7}
.ring{border-radius:32px;padding:6px}
.frame{aspect-ratio:auto;border-radius:26px;min-height:260px;background:#fff;border-width:5px}
.frame img{position:static;display:block;width:100%;height:auto;max-height:580px;object-fit:contain;background:#fff}
.initials{border-radius:0}
.photo{width:min(100%,400px)}
.cert-filters{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin-top:24px}
.cert button.thumb{width:calc(100% + 12px);padding:0;cursor:zoom-in;font:inherit;display:block}
.cert button.thumb:focus-visible{outline:3px solid var(--cool)}
.plink{margin-top:10px}
dialog#lightbox{border:none;border-radius:14px;padding:0;max-width:min(920px,94vw);width:100%;background:var(--card);color:var(--ink);box-shadow:0 30px 80px -20px rgba(0,0,0,.6)}
dialog#lightbox::backdrop{background:rgba(5,12,15,.78);backdrop-filter:blur(3px)}
.lb-body{padding:22px;position:relative}
.lb-body h3{font-size:1.2rem;margin:0 44px 14px 0}
.lb-body img{display:block;max-width:100%;max-height:70vh;margin:0 auto;border:1px solid var(--line);border-radius:8px;background:#fff}
.lb-close{position:absolute;top:16px;right:16px}
.lb-links{margin-top:16px;justify-content:center}
@media (max-width:760px){.frame img{max-height:460px}}

/* v13: keep the photo above the SH placeholder */
.frame img{position:relative;z-index:1}
.initials{z-index:0}

/* verification block on education cards */
.edu-card .serial{margin-top:12px;font-size:.88rem;display:flex;flex-wrap:wrap;align-items:center;gap:8px;color:var(--muted)}
.edu-card .serial code{font:500 .85rem ui-monospace,Consolas,monospace;color:var(--ink);background:var(--paper);border:1px solid var(--line);border-radius:6px;padding:2px 8px}
.edu-card .serial .chip{padding:2px 12px;font-size:.82rem}
.edu-card .cert-links{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.edu-card .cert-links .verify{margin-top:0}
.edu-card p.note{margin-top:10px;font-size:.8rem;color:var(--muted);font-style:italic}

/* email logo */
.mail{display:flex;align-items:center;flex-wrap:wrap;gap:12px}
.mail .chip{margin-left:0}
.mail-ic{display:grid;place-items:center;width:42px;height:42px;border-radius:50%;background:#EA4335;color:#fff;font-size:1.05rem;flex:none;box-shadow:0 8px 20px -10px #EA4335}