:root{
  --night:#080C1E;
  --deep:#0E1430;
  --panel:rgba(21,28,58,.72);
  --panel-solid:#151C3A;
  --line:rgba(158,178,255,.14);
  --star-gold:#F3C878;
  --gold-dim:rgba(243,200,120,.35);
  --sea-teal:#7ED4C6;
  --text:#EAEDFB;
  --muted:#9AA5CE;
  --shadow:0 24px 60px rgba(2,4,14,.55);
  --r:18px;
  --ease:cubic-bezier(.22,.9,.28,1);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--night);
  color:var(--text);
  font-family:'Outfit',sans-serif;
  font-weight:300;
  line-height:1.65;
  overflow-x:hidden;
  min-height:100vh;
}
::selection{background:var(--gold-dim);color:#fff}

/* ---------- sky ---------- */
#sky{position:fixed;inset:0;z-index:0;display:block}
.sky-glow{
  position:fixed;z-index:0;pointer-events:none;
  width:70vmax;height:70vmax;border-radius:50%;
  background:radial-gradient(circle,rgba(126,212,198,.05),transparent 60%);
  bottom:-40vmax;left:50%;transform:translateX(-50%);
}

/* ---------- shell ---------- */
.shell{position:relative;z-index:2;max-width:1120px;margin:0 auto;padding:0 28px}

/* ---------- nav ---------- */
nav{
  position:fixed;top:0;left:0;right:0;z-index:50;
  backdrop-filter:blur(14px);
  background:rgba(8,12,30,.55);
  border-bottom:1px solid var(--line);
}
.nav-in{max-width:1120px;margin:0 auto;padding:14px 28px;display:flex;align-items:center;gap:26px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);margin-right:auto}
.brand svg{width:26px;height:26px}
.brand span{font-family:'Fraunces',serif;font-weight:500;font-size:1.05rem;letter-spacing:.02em}
.nav-links{display:flex;gap:4px;flex-wrap:wrap}
.nav-links a{
  color:var(--muted);text-decoration:none;font-size:.85rem;letter-spacing:.06em;
  padding:7px 13px;border-radius:999px;transition:color .25s,background .25s;
  font-weight:400;
}
.nav-links a:hover{color:var(--text)}
.nav-links a.active{color:var(--night);background:var(--star-gold);font-weight:500}
.nav-links a:focus-visible,.btn:focus-visible,a:focus-visible{outline:2px solid var(--star-gold);outline-offset:2px}
#menu-btn{display:none;background:none;border:1px solid var(--line);color:var(--text);border-radius:10px;padding:6px 12px;font-family:inherit;font-size:.85rem;cursor:pointer}

/* ---------- pages ---------- */
.page{display:none;padding:120px 0 90px;min-height:100vh}
.page.on{display:block;animation:rise .7s var(--ease)}
@keyframes rise{from{opacity:0;transform:translateY(26px)}to{opacity:1;transform:none}}

.eyebrow{
  font-family:'JetBrains Mono',monospace;font-size:.72rem;letter-spacing:.32em;
  text-transform:uppercase;color:var(--sea-teal);display:flex;align-items:center;gap:12px;margin-bottom:18px;
}
.eyebrow::before{content:"";width:34px;height:1px;background:var(--sea-teal);opacity:.6}
h1,h2,h3{font-family:'Fraunces',serif;font-weight:400;line-height:1.12}
h1{font-size:clamp(2.6rem,6.2vw,4.6rem);letter-spacing:-.01em}
h2{font-size:clamp(1.9rem,3.8vw,2.7rem);margin-bottom:14px}
h1 em,h2 em{font-style:italic;color:var(--star-gold)}
.lede{color:var(--muted);font-size:1.06rem;max-width:640px}

/* ---------- home ---------- */
#home .hero{display:grid;grid-template-columns:1.25fr .75fr;gap:48px;align-items:center;min-height:calc(100vh - 220px)}
.type-line{
  font-family:'JetBrains Mono',monospace;color:var(--sea-teal);
  font-size:.95rem;min-height:1.6em;margin:20px 0 8px;
}
.type-line .cursor{display:inline-block;width:9px;background:var(--sea-teal);animation:blink 1s steps(1) infinite;color:transparent}
@keyframes blink{50%{opacity:0}}
.hero-actions{display:flex;gap:14px;margin-top:34px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:9px;text-decoration:none;cursor:pointer;
  font-family:'Outfit',sans-serif;font-weight:500;font-size:.92rem;letter-spacing:.03em;
  padding:13px 26px;border-radius:999px;transition:transform .3s var(--ease),box-shadow .3s,background .3s;
  border:1px solid transparent;
}
.btn.gold{background:var(--star-gold);color:var(--night)}
.btn.gold:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(243,200,120,.25)}
.btn.ghost{border-color:var(--line);color:var(--text)}
.btn.ghost:hover{border-color:var(--star-gold);color:var(--star-gold);transform:translateY(-2px)}
.hero-stats{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.stat{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--r);
  padding:22px 20px;backdrop-filter:blur(8px);transition:transform .35s var(--ease),border-color .35s;
}
.stat:hover{transform:translateY(-4px);border-color:var(--gold-dim)}
.stat b{display:block;font-family:'Fraunces',serif;font-weight:500;font-size:1.9rem;color:var(--star-gold)}
.stat span{font-size:.8rem;color:var(--muted);letter-spacing:.04em}
.scroll-hint{margin-top:60px;color:var(--muted);font-size:.78rem;letter-spacing:.2em;text-transform:uppercase;display:flex;align-items:center;gap:10px}
.scroll-hint i{width:7px;height:7px;border-radius:50%;background:var(--star-gold);animation:pulse 2.4s infinite}
@keyframes pulse{0%,100%{opacity:.3;transform:scale(.8)}50%{opacity:1;transform:scale(1.2)}}

/* ---------- about / constellation ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:52px;align-items:start;margin-top:38px}
.prose p{color:var(--muted);margin-bottom:16px;font-size:1rem}
.prose strong{color:var(--text);font-weight:500}
.const-card{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--r);
  padding:26px;backdrop-filter:blur(8px);box-shadow:var(--shadow);
}
.const-card h3{font-size:1.15rem;margin-bottom:4px}
.const-card .sub{font-family:'JetBrains Mono',monospace;font-size:.7rem;color:var(--muted);letter-spacing:.18em;text-transform:uppercase}
#constellation{width:100%;height:auto;display:block;margin-top:8px}
#constellation .cline{stroke:var(--gold-dim);stroke-width:1.1;stroke-dasharray:400;stroke-dashoffset:400}
.page.on #constellation .cline{animation:draw 2.6s 1.4s var(--ease) forwards}
@keyframes draw{to{stroke-dashoffset:0}}
#constellation .cstar{fill:var(--star-gold);opacity:0;transform-origin:center}
.page.on #constellation .cstar{animation:star-in .6s var(--ease) forwards}
#constellation text{fill:var(--muted);font-family:'JetBrains Mono',monospace;font-size:9.5px;letter-spacing:.06em;opacity:0}
.page.on #constellation text{animation:fade .8s var(--ease) forwards}
@keyframes star-in{from{opacity:0;transform:scale(0)}to{opacity:1;transform:scale(1)}}
@keyframes fade{to{opacity:1}}
.chips{display:flex;flex-wrap:wrap;gap:9px;margin-top:14px}
.chip{
  font-size:.78rem;padding:7px 14px;border-radius:999px;border:1px solid var(--line);
  color:var(--muted);transition:all .3s;background:rgba(255,255,255,.02);
}
.chip:hover{border-color:var(--sea-teal);color:var(--sea-teal);transform:translateY(-2px)}
.mini-h{font-family:'JetBrains Mono',monospace;font-size:.7rem;letter-spacing:.26em;text-transform:uppercase;color:var(--sea-teal);margin:30px 0 6px}

/* ---------- skills ---------- */
.sky-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:20px;margin-top:40px}
.cluster{
  position:relative;background:var(--panel);border:1px solid var(--line);border-radius:var(--r);
  padding:26px;overflow:hidden;transition:transform .35s var(--ease),border-color .35s;backdrop-filter:blur(8px);
}
.cluster:hover{transform:translateY(-5px);border-color:var(--gold-dim)}
.cluster::after{
  content:"";position:absolute;top:-30px;right:-30px;width:110px;height:110px;border-radius:50%;
  background:radial-gradient(circle,var(--gold-dim),transparent 70%);opacity:0;transition:opacity .4s;
}
.cluster:hover::after{opacity:.5}
.cluster h3{font-size:1.1rem;display:flex;align-items:center;gap:10px;margin-bottom:12px}
.cluster h3 .dot{width:9px;height:9px;border-radius:50%;background:var(--star-gold);box-shadow:0 0 12px var(--star-gold)}
.cluster.teal h3 .dot{background:var(--sea-teal);box-shadow:0 0 12px var(--sea-teal)}
.tagset{display:flex;flex-wrap:wrap;gap:8px}
.tag{
  font-family:'JetBrains Mono',monospace;font-size:.72rem;color:var(--text);
  padding:6px 11px;border-radius:8px;background:rgba(255,255,255,.05);
  border:1px solid transparent;transition:all .25s;cursor:default;
}
.tag:hover{border-color:var(--star-gold);color:var(--star-gold);transform:scale(1.06)}

/* ---------- projects ---------- */
.feature{
  margin-top:40px;background:linear-gradient(140deg,rgba(243,200,120,.09),var(--panel) 45%);
  border:1px solid var(--gold-dim);border-radius:22px;padding:34px;box-shadow:var(--shadow);
  backdrop-filter:blur(8px);
}
.feature .flag{
  display:inline-flex;align-items:center;gap:8px;font-family:'JetBrains Mono',monospace;
  font-size:.68rem;letter-spacing:.24em;text-transform:uppercase;color:var(--star-gold);
  border:1px solid var(--gold-dim);border-radius:999px;padding:5px 14px;margin-bottom:16px;
}
.feature h3{font-size:1.7rem;margin-bottom:10px}
.metrics{display:flex;gap:26px;flex-wrap:wrap;margin:20px 0 6px}
.metric b{font-family:'Fraunces',serif;font-size:1.5rem;color:var(--star-gold);font-weight:500}
.metric span{display:block;font-size:.74rem;color:var(--muted);letter-spacing:.05em}
.proj-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(290px,1fr));gap:20px;margin-top:22px}
.proj{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:24px;
  transition:transform .35s var(--ease),border-color .35s;backdrop-filter:blur(8px);
  display:flex;flex-direction:column;gap:10px;
}
.proj:hover{transform:translateY(-5px);border-color:var(--gold-dim)}
.proj h3{font-size:1.12rem}
.proj p{color:var(--muted);font-size:.9rem;flex:1}
.proj .tagset .tag{font-size:.66rem}
details.more{margin-top:6px}
details.more summary{
  cursor:pointer;list-style:none;color:var(--sea-teal);font-size:.82rem;font-weight:500;letter-spacing:.04em;
  display:inline-flex;align-items:center;gap:7px;
}
details.more summary::after{content:"\2193";transition:transform .3s}
details.more[open] summary::after{transform:rotate(180deg)}
details.more ul{margin:12px 0 0 18px;color:var(--muted);font-size:.88rem}
details.more li{margin-bottom:7px}

/* ---------- research ---------- */
.paper{
  margin-top:40px;background:var(--panel);border:1px solid var(--line);border-left:3px solid var(--sea-teal);
  border-radius:var(--r);padding:32px;backdrop-filter:blur(8px);box-shadow:var(--shadow);
}
.paper h3{font-size:1.35rem;margin-bottom:8px}
.paper .venue{font-family:'JetBrains Mono',monospace;font-size:.74rem;color:var(--sea-teal);letter-spacing:.1em;margin-bottom:14px}
.paper p{color:var(--muted);font-size:.95rem}
.paper ul.interests{margin:14px 0 0 20px;color:var(--muted);font-size:.95rem}
.paper ul.interests li{margin-bottom:8px}
.orbit-note{
  margin-top:26px;display:flex;gap:16px;align-items:flex-start;background:rgba(126,212,198,.05);
  border:1px dashed rgba(126,212,198,.3);border-radius:var(--r);padding:20px 22px;
}
.orbit-note svg{flex:none;width:30px;height:30px;margin-top:2px}
.orbit-note p{color:var(--muted);font-size:.9rem}

/* ---------- contact ---------- */
.contact-wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;margin-top:40px;align-items:start}
.c-links{display:flex;flex-direction:column;gap:14px}
.c-link{
  display:flex;align-items:center;gap:16px;text-decoration:none;color:var(--text);
  background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:18px 22px;
  transition:transform .3s var(--ease),border-color .3s;backdrop-filter:blur(8px);
}
.c-link:hover{transform:translateX(6px);border-color:var(--gold-dim)}
.c-link .ic{
  flex:none;width:42px;height:42px;border-radius:12px;display:grid;place-items:center;
  background:rgba(243,200,120,.1);color:var(--star-gold);font-size:1.05rem;
}
.c-link small{display:block;color:var(--muted);font-size:.76rem;letter-spacing:.08em;text-transform:uppercase}
.c-link span{font-size:.95rem;word-break:break-all}
.lang-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}

footer{position:relative;z-index:2;border-top:1px solid var(--line);padding:26px 28px;text-align:center;color:var(--muted);font-size:.8rem;letter-spacing:.05em}
footer b{color:var(--star-gold);font-weight:500}

/* ---------- astro chatbot ---------- */
#astro-fab{
  position:fixed;right:22px;bottom:22px;z-index:80;width:64px;height:64px;border-radius:50%;
  background:var(--panel-solid);border:1px solid var(--gold-dim);cursor:pointer;display:grid;place-items:center;
  box-shadow:0 12px 34px rgba(2,4,14,.6);transition:transform .3s var(--ease);
  animation:bob 4s ease-in-out infinite;
}
#astro-fab:hover{transform:scale(1.08)}
#astro-fab.hidden{display:none}
#astro-fab svg{width:40px;height:40px}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(-7px)}}
#astro-panel{
  position:fixed;right:22px;bottom:98px;z-index:80;width:min(360px,calc(100vw - 44px));
  background:var(--panel-solid);border:1px solid var(--line);border-radius:20px;overflow:hidden;
  box-shadow:0 26px 70px rgba(2,4,14,.7);display:none;flex-direction:column;max-height:min(520px,70vh);
}
#astro-panel.open{display:flex;animation:rise .4s var(--ease)}
.astro-head{display:flex;align-items:center;gap:12px;padding:14px 16px;border-bottom:1px solid var(--line);background:rgba(243,200,120,.06)}
.astro-head svg{width:34px;height:34px;flex:none}
.astro-head b{font-family:'Fraunces',serif;font-weight:500;font-size:1rem;display:block;line-height:1.2}
.astro-head small{color:var(--muted);font-size:.7rem;font-family:'JetBrains Mono',monospace;letter-spacing:.06em}
#astro-close{margin-left:auto;background:none;border:none;color:var(--muted);font-size:1.1rem;cursor:pointer;padding:4px 8px}
#astro-close:hover{color:var(--text)}
#astro-msgs{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:10px}
.a-msg{max-width:85%;padding:10px 14px;border-radius:14px;font-size:.87rem;line-height:1.5}
.a-msg.bot{background:rgba(255,255,255,.05);border:1px solid var(--line);border-bottom-left-radius:4px;align-self:flex-start}
.a-msg.user{background:var(--star-gold);color:var(--night);border-bottom-right-radius:4px;align-self:flex-end;font-weight:400}
.a-msg a{color:var(--sea-teal)}
.a-msg.user a{color:var(--night);font-weight:500}
.astro-chips{display:flex;gap:7px;flex-wrap:wrap;padding:0 16px 10px}
.astro-chips button{
  font-family:'JetBrains Mono',monospace;font-size:.68rem;color:var(--sea-teal);background:none;
  border:1px solid rgba(126,212,198,.35);border-radius:999px;padding:6px 12px;cursor:pointer;transition:all .25s;
}
.astro-chips button:hover{background:rgba(126,212,198,.12)}
.astro-input{display:flex;gap:8px;padding:12px 14px;border-top:1px solid var(--line)}
.astro-input input{
  flex:1;background:rgba(255,255,255,.05);border:1px solid var(--line);border-radius:12px;
  color:var(--text);font-family:'Outfit',sans-serif;font-size:.88rem;padding:10px 14px;outline:none;
}
.astro-input input:focus{border-color:var(--gold-dim)}
.astro-input button{
  background:var(--star-gold);color:var(--night);border:none;border-radius:12px;padding:0 18px;
  font-family:'Outfit',sans-serif;font-weight:500;cursor:pointer;font-size:.88rem;
}

/* ---------- responsive ---------- */
@media(max-width:900px){
  #home .hero,.split,.contact-wrap{grid-template-columns:1fr;gap:34px}
  .hero-stats{grid-template-columns:repeat(2,1fr)}
  .nav-links{
    display:none;position:absolute;top:100%;right:16px;flex-direction:column;
    background:var(--panel-solid);border:1px solid var(--line);border-radius:14px;padding:10px;min-width:180px;
    box-shadow:var(--shadow);
  }
  .nav-links.open{display:flex}
  #menu-btn{display:block}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001s!important;transition-duration:.001s!important}
  #astro-fab{animation:none}
}

/* ---------- nebula page transition (particle canvas) ---------- */
#nebula-cv{position:fixed;inset:0;z-index:90;pointer-events:none}