:root{--bg:#0d1117;--panel:#161b22;--line:#30363d;--text:#c9d1d9;--mute:#8b949e;--white:#f0f6fc;--blue:#58a6ff;--green:#238636;--green2:#2ea043;--mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 -apple-system,"Segoe UI","Noto Sans",Helvetica,Arial,sans-serif}
a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}
h1,h2,h3{color:var(--white);margin:0;line-height:1.25}
:focus-visible{outline:2px solid var(--blue);outline-offset:2px}
.container{max-width:1100px;margin:0 auto;padding:0 20px}
/* header */
.hdr{background:var(--panel);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.hdr .container{display:flex;align-items:center;gap:16px;height:64px}
.brand{display:flex;align-items:center;gap:10px;color:var(--white);font-weight:600}.brand:hover{text-decoration:none}
.brand-avatar{width:32px;height:32px;border-radius:50%;object-fit:cover;border:1px solid #334155;background:var(--panel);vertical-align:middle;display:inline-block}
.nav{display:none;margin-left:auto;gap:4px;align-items:center}
.nav a{color:var(--text);padding:6px 12px;border-radius:6px;font-size:14px}.nav a:hover{background:#21262d;text-decoration:none}
.nav a.on{color:var(--white);font-weight:600;background:#21262d}
.burger{margin-left:auto;background:none;border:1px solid var(--line);color:var(--white);border-radius:6px;padding:6px 10px;font-size:18px;cursor:pointer}
.open .nav{display:flex;flex-direction:column;align-items:stretch;position:absolute;top:64px;left:0;right:0;background:var(--panel);border-bottom:1px solid var(--line);padding:8px 20px 16px}
.open .nav a{padding:10px 12px}
.btn{display:inline-block;background:#21262d;border:1px solid #363b42;color:var(--text);padding:8px 18px;border-radius:6px;font-weight:600;font-size:14px;cursor:pointer;font-family:inherit}
.btn:hover{background:#30363d;text-decoration:none}
.btn.go{background:var(--green);border-color:rgba(240,246,252,.1);color:#fff}.btn.go:hover{background:var(--green2)}
.btn.lg{padding:12px 24px;font-size:16px}
/* hero */
.hero{padding:48px 0 32px;display:grid;gap:40px;align-items:center}
.status{display:inline-flex;gap:8px;align-items:center;border:1px solid var(--line);border-radius:2em;padding:2px 12px;font-size:13px;color:var(--text);background:var(--panel)}
.status i{width:8px;height:8px;border-radius:50%;background:#3fb950;box-shadow:0 0 0 3px rgba(63,185,80,.25)}
.who{display:flex;gap:16px;align-items:center;margin:20px 0}
.avatar{width:88px;height:88px;border-radius:50%;border:1px solid #334155;object-fit:cover;background:var(--panel);flex:none}
.hero h1{font-size:clamp(34px,7vw,56px);letter-spacing:-.02em}
.hero .role{font-size:clamp(18px,3vw,24px);color:var(--mute);margin-top:4px}
.hero p.lead{max-width:56ch;margin:20px 0 28px;font-size:17px}
.cta{display:flex;gap:12px;flex-wrap:wrap}
.socials{display:flex;gap:16px;margin-top:24px;flex-wrap:wrap;font-size:14px}
/* code window */
.win{background:var(--panel);border:1px solid var(--line);border-radius:10px;overflow:hidden;box-shadow:0 16px 40px rgba(1,4,9,.6)}
.win .bar{display:flex;gap:7px;align-items:center;padding:10px 14px;border-bottom:1px solid var(--line);background:#0d1117}
.win .bar i{width:11px;height:11px;border-radius:50%;background:#30363d}.win .bar span{margin-left:8px;color:var(--mute);font:12px var(--mono)}
.win pre{margin:0;padding:16px;overflow-x:auto;font:13px/1.7 var(--mono);color:var(--text)}
.k{color:#ff7b72}.s{color:#a5d6ff}.n{color:#79c0ff}.c{color:var(--mute)}.f{color:#d2a8ff}
/* stats */
.stats{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:24px 0 8px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:6px}
.stat{padding:16px}.stat b{display:block;font-size:28px;color:var(--white)}.stat span{color:var(--mute);font-size:13px}
/* sections */
section{padding:48px 0 8px}
.head{display:flex;justify-content:space-between;align-items:baseline;gap:16px;border-bottom:1px solid var(--line);padding-bottom:12px;margin-bottom:24px;flex-wrap:wrap}
.head h2{font-size:28px;font-weight:600}.head p{margin:0;color:var(--mute)}
.page-title{padding:48px 0 0}.page-title h1{font-size:clamp(30px,6vw,44px)}.page-title p{color:var(--mute);max-width:60ch;margin:8px 0 0}
.grid{display:grid;gap:16px}
.proj{padding:20px;display:flex;flex-direction:column;gap:12px;transition:border-color .15s}
.proj:hover{border-color:var(--mute)}
.proj h3{font-size:18px}.proj h3 a{color:var(--blue)}
.proj p{margin:0;color:var(--text);font-size:15px}.proj ul{margin:0;padding-left:18px;color:var(--text);font-size:15px}.proj li{margin:4px 0}
.proj .foot{margin-top:auto;display:flex;gap:16px;align-items:center;flex-wrap:wrap;font-size:13px;color:var(--mute)}
.pub{font-size:12px;font-weight:500;color:var(--mute);border:1px solid var(--line);border-radius:2em;padding:0 8px;margin-left:8px;vertical-align:middle}
.dot{display:inline-block;width:12px;height:12px;border-radius:50%;margin-right:6px;vertical-align:-1px;border:1px solid rgba(240,246,252,.15)}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chip{background:rgba(56,139,253,.1);color:var(--blue);border-radius:2em;padding:0 10px;font-size:12px;font-weight:500;line-height:24px}
/* timeline */
.tl{list-style:none;margin:0 0 0 8px;padding:0 0 0 28px;border-left:2px solid var(--line)}
.tl>li{position:relative;padding-bottom:32px}
.tl>li::before{content:"";position:absolute;left:-37px;top:6px;width:12px;height:12px;border-radius:50%;background:var(--green);border:3px solid var(--bg);box-sizing:content-box}
.tl h3{font-size:18px}.tl .org{color:var(--blue)}.tl .when{color:var(--mute);font-size:13px;font-family:var(--mono);margin:2px 0 8px}
.tl ul{margin:8px 0 0;padding-left:18px;max-width:75ch}.tl li li{margin:6px 0}
/* skills */
.skill{padding:20px;display:grid;gap:12px}.skill h3{font-size:15px}
.rows>div{padding:14px 20px;border-top:1px solid var(--line)}.rows>div:first-child{border:0}.rows small{display:block;color:var(--mute)}
/* about */
.about{display:grid;gap:32px}.about p{max-width:65ch;margin:0 0 16px}
.ph{width:100%;max-width:300px;aspect-ratio:1;border-radius:50%;border:1px solid #334155;object-fit:cover;background:var(--panel)}
.cta-box{margin:56px 0 0;padding:32px 24px;text-align:center}.cta-box h2{font-size:26px;margin-bottom:8px}.cta-box p{margin:0 auto 20px;max-width:50ch;color:var(--mute)}
/* contact */
.cgrid{display:grid;gap:24px;margin-top:32px}
.form{padding:20px;display:grid;gap:16px}.form label{font-weight:600;color:var(--white);font-size:14px;display:grid;gap:6px}
.row{display:grid;gap:16px}
input,textarea,select{background:var(--bg);border:1px solid var(--line);color:var(--text);border-radius:6px;padding:8px 12px;font:inherit;width:100%}
input:focus,textarea:focus,select:focus{border-color:var(--blue);outline:1px solid var(--blue)}
textarea{min-height:160px;resize:vertical}
.toast{display:none;padding:12px 16px;border:1px solid #2ea043;background:rgba(46,160,67,.15);border-radius:6px;color:var(--white)}.toast.show{display:block}
.links a{display:block;padding:14px 20px;border-top:1px solid var(--line)}.links a:first-child{border:0}.links small{display:block;color:var(--mute)}
footer{margin-top:72px;border-top:1px solid var(--line);padding:28px 0;color:var(--mute);font-size:13px}
footer .container{display:flex;gap:16px 24px;flex-wrap:wrap;justify-content:space-between}
footer nav{display:flex;gap:16px;flex-wrap:wrap}
@media(min-width:640px){.stats{grid-template-columns:repeat(4,1fr)}.grid.c2,.grid.c3{grid-template-columns:repeat(2,1fr)}.row{grid-template-columns:1fr 1fr}}
@media(min-width:900px){
 .burger{display:none}.nav{display:flex}
 .hero{grid-template-columns:1.1fr 1fr;padding-top:80px}
 .avatar{width:112px;height:112px}
 .grid.c3{grid-template-columns:repeat(3,1fr)}
 .about{grid-template-columns:300px 1fr;gap:56px}
 .cgrid{grid-template-columns:1.4fr 1fr}
 .tl{margin-left:12px}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.proj{transition:none}}
/* v3 additions */
.nav{gap:2px}.nav a,.nav summary{font-size:14px}
details.more{position:relative}
details.more summary{list-style:none;cursor:pointer;color:var(--text);padding:6px 12px;border-radius:6px}
details.more summary::-webkit-details-marker{display:none}
details.more summary::after{content:" ▾";font-size:11px}
details.more summary:hover,details.more.on summary{background:#21262d}details.more.on summary{color:var(--white);font-weight:600}
details.more div{display:flex;flex-direction:column;padding-left:12px}
.res-meta{color:var(--mute);font-size:14px}
.big-link{display:block;padding:16px 20px;border-top:1px solid var(--line);color:var(--blue);font-size:17px}.big-link:first-child{border:0}.big-link:hover{background:#1b2028;text-decoration:none}
.big-link small{display:block;color:var(--mute);font-size:13px}
@media(max-width:1079px){.burger{display:block}.nav{display:none}}
@media(min-width:1080px){
 details.more div{position:absolute;top:100%;left:0;min-width:180px;background:var(--panel);border:1px solid var(--line);border-radius:6px;padding:6px;margin-top:6px;z-index:30}
}
/* v4: detail pages */
.crumb{display:inline-block;margin-top:32px;font-size:14px;color:var(--mute)}.crumb:hover{color:var(--blue)}
.crumb+.page-title{padding-top:16px}
.detail{margin-top:0}.detail p{margin:0}
.detail-chips{margin-top:20px;display:grid;gap:8px}.detail-chips h3{font-size:14px;color:var(--mute);font-weight:600}
section .btn{margin-top:24px}
.pn{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-top:40px;padding-top:16px;border-top:1px solid var(--line);font-size:14px}
.proj h3 a:hover{text-decoration:underline}

/* v5: education */
.uni{width:100%;aspect-ratio:16/9;object-fit:cover;background:var(--panel);display:block}
.edu-card{overflow:hidden;display:flex;flex-direction:column}
.edu-body{padding:20px;display:grid;gap:10px}.edu-body h3{font-size:20px}.edu-body p{margin:0}
.edu-hero{display:grid;gap:16px;margin-bottom:8px}.edu-hero .uni{border-radius:6px;border:1px solid var(--line)}.edu-hero h3{font-size:18px;margin-bottom:6px}
@media(min-width:900px){.edu-hero{grid-template-columns:1.2fr 1fr;align-items:stretch}.edu-hero .card{align-self:center}}