/* ===== Reset & tokens ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#0a0c12;
  --bg-soft:#11141d;
  --card:#141824;
  --card-2:#171c2b;
  --line:#232a3d;
  --text:#e7ecf5;
  --muted:#8a94ad;
  --accent:#54f0c8;      /* teal-green */
  --accent-2:#6d8bff;    /* electric blue */
  --accent-3:#b78cff;    /* violet */
  --glow:rgba(84,240,200,.18);
  --radius:16px;
  --mono:'JetBrains Mono',ui-monospace,monospace;
  --sans:'Inter',system-ui,-apple-system,sans-serif;
  --max:1120px;
}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);
  background:var(--bg);
  color:var(--text);
  line-height:1.65;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%}
::selection{background:var(--accent);color:#04120e}

/* ===== Background FX ===== */
.bg-grid{
  position:fixed;inset:0;z-index:-2;
  background-image:linear-gradient(var(--line) 1px,transparent 1px),
                   linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:52px 52px;
  opacity:.28;
  mask-image:radial-gradient(ellipse 90% 60% at 50% 0%,#000 25%,transparent 75%);
}
.bg-glow{
  position:fixed;z-index:-1;top:-15%;left:50%;transform:translateX(-50%);
  width:900px;height:700px;pointer-events:none;
  background:radial-gradient(circle at 30% 30%,var(--glow),transparent 60%),
            radial-gradient(circle at 70% 40%,rgba(109,139,255,.16),transparent 60%);
  filter:blur(40px);
}

/* ===== Nav ===== */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:50;
  display:flex;align-items:center;justify-content:space-between;
  padding:18px clamp(20px,5vw,60px);
  transition:background .3s,border-color .3s,padding .3s;
  border-bottom:1px solid transparent;
}
.nav.scrolled{
  background:rgba(10,12,18,.8);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
  padding-top:12px;padding-bottom:12px;
}
.nav__logo{font-family:var(--mono);font-weight:700;font-size:1.05rem;letter-spacing:-.5px}
.nav__logo .prompt{color:var(--accent);margin-right:4px}
.nav__logo .accent{color:var(--muted)}
.nav__links{display:flex;align-items:center;gap:28px}
.nav__links a{font-size:.9rem;color:var(--muted);font-weight:500;transition:color .2s;position:relative}
.nav__links a:not(.nav__resume):hover{color:var(--text)}
.nav__links a:not(.nav__resume)::after{
  content:'';position:absolute;left:0;bottom:-6px;width:0;height:2px;
  background:var(--accent);transition:width .25s;border-radius:2px;
}
.nav__links a:not(.nav__resume):hover::after{width:100%}
.nav__resume{
  font-family:var(--mono);font-size:.82rem;color:var(--accent)!important;
  border:1px solid var(--accent);padding:7px 14px;border-radius:8px;
  transition:background .2s,color .2s,box-shadow .2s;
}
.nav__resume:hover{background:var(--accent);color:#04120e!important;box-shadow:0 0 22px var(--glow)}
.nav__toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
.nav__toggle span{width:26px;height:2px;background:var(--text);border-radius:2px;transition:.3s}
.nav__toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav__toggle.open span:nth-child(2){opacity:0}
.nav__toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ===== Layout ===== */
main{max-width:var(--max);margin:0 auto;padding:0 clamp(20px,5vw,40px)}
.section{padding:90px 0;scroll-margin-top:80px}
.section__head{display:flex;align-items:center;gap:16px;margin-bottom:42px}
.section__index{font-family:var(--mono);color:var(--accent);font-size:1rem;font-weight:500}
.section__title{font-size:clamp(1.6rem,4vw,2.3rem);font-weight:700;letter-spacing:-1px}
.section__head::after{content:'';flex:1;height:1px;background:linear-gradient(90deg,var(--line),transparent)}

/* ===== Hero ===== */
.hero{
  min-height:100vh;display:flex;flex-direction:column;justify-content:center;
  padding:120px 0 60px;gap:52px;
}
.hero__eyebrow{
  font-family:var(--mono);font-size:.85rem;color:var(--accent);
  display:inline-flex;align-items:center;gap:9px;margin-bottom:22px;
}
.hero__eyebrow .dot{width:8px;height:8px;border-radius:50%;background:var(--accent);box-shadow:0 0 12px var(--accent);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}
.hero__title{
  font-size:clamp(3rem,9vw,6rem);font-weight:800;letter-spacing:-3px;line-height:1;
  background:linear-gradient(120deg,#fff 20%,var(--accent) 60%,var(--accent-2) 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;margin-bottom:12px;
}
.hero__role{
  font-family:var(--mono);font-size:clamp(1.1rem,3vw,1.6rem);color:var(--accent-2);
  min-height:1.6em;margin-bottom:22px;font-weight:500;
}
.hero__role::after{content:'▋';color:var(--accent);animation:blink 1s step-end infinite;margin-left:2px}
@keyframes blink{50%{opacity:0}}
.hero__desc{max-width:640px;color:var(--muted);font-size:1.08rem}
.hero__desc strong{color:var(--text);font-weight:600}
.hero__cta{display:flex;gap:16px;margin:34px 0 26px;flex-wrap:wrap}
.hero__socials{display:flex;gap:24px;font-family:var(--mono);font-size:.9rem}
.hero__socials a{color:var(--muted);transition:color .2s;border-bottom:1px solid transparent;padding-bottom:2px}
.hero__socials a:hover{color:var(--accent);border-color:var(--accent)}

.btn{
  display:inline-flex;align-items:center;gap:8px;font-weight:600;font-size:.95rem;
  padding:13px 26px;border-radius:10px;cursor:pointer;border:1px solid transparent;
  transition:transform .2s,box-shadow .2s,background .2s,border-color .2s;font-family:var(--sans);
}
.btn--primary{background:var(--accent);color:#04120e}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 10px 30px var(--glow)}
.btn--ghost{border-color:var(--line);color:var(--text);background:rgba(255,255,255,.02)}
.btn--ghost:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-2px)}

.hero__stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.stat{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px;transition:transform .25s,border-color .25s;
}
.stat:hover{transform:translateY(-4px);border-color:var(--accent)}
.stat__num{display:block;font-family:var(--mono);font-size:1.7rem;font-weight:700;color:var(--accent);letter-spacing:-1px}
.stat__label{font-size:.82rem;color:var(--muted)}

/* ===== About ===== */
.about{max-width:820px;display:flex;flex-direction:column;gap:20px}
.about p{color:var(--muted);font-size:1.06rem}
.about strong{color:var(--text)}
.about__tags{display:flex;flex-wrap:wrap;gap:12px;margin-top:10px}
.about__tags span{
  font-family:var(--mono);font-size:.82rem;color:var(--accent);
  border:1px solid var(--line);padding:6px 14px;border-radius:30px;background:rgba(84,240,200,.04);
}

/* ===== Timeline ===== */
.timeline{position:relative;padding-left:8px}
.tl-item{position:relative;padding-left:34px;padding-bottom:10px}
.tl-item__marker{position:absolute;left:0;top:8px;width:14px;height:14px;border-radius:50%;
  background:var(--accent);box-shadow:0 0 0 5px rgba(84,240,200,.12)}
.tl-item__body{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px 28px}
.tl-item__top{display:flex;justify-content:space-between;align-items:baseline;gap:14px;flex-wrap:wrap}
.tl-item__top h3{font-size:1.25rem;font-weight:700}
.tl-item__date{font-family:var(--mono);font-size:.82rem;color:var(--accent)}
.tl-item__org{color:var(--accent-2);font-weight:500;margin:4px 0 16px;font-size:.95rem}
.tl-item ul{list-style:none;display:flex;flex-direction:column;gap:12px;margin-bottom:18px}
.tl-item li{position:relative;padding-left:22px;color:var(--muted);font-size:.98rem}
.tl-item li::before{content:'▹';position:absolute;left:0;color:var(--accent)}
.tl-item li strong{color:var(--text);font-weight:600}

/* ===== Chips ===== */
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips span{
  font-family:var(--mono);font-size:.75rem;color:var(--muted);
  border:1px solid var(--line);padding:4px 10px;border-radius:6px;
  background:var(--card-2);transition:color .2s,border-color .2s;
}
.chips span:hover{color:var(--accent);border-color:var(--accent)}

/* ===== Projects ===== */
.projects{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:24px}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:28px;display:flex;flex-direction:column;gap:12px;
  transition:transform .25s,border-color .25s,box-shadow .25s;position:relative;overflow:hidden;
}
.card::before{content:'';position:absolute;inset:0;border-radius:var(--radius);padding:1px;
  background:linear-gradient(135deg,var(--accent),transparent 40%);opacity:0;
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  -webkit-mask-composite:xor;mask-composite:exclude;transition:opacity .3s;pointer-events:none}
.card:hover{transform:translateY(-6px);border-color:transparent;box-shadow:0 18px 40px rgba(0,0,0,.4)}
.card:hover::before{opacity:1}
.card__top{display:flex;justify-content:space-between;align-items:center}
.card__folder{font-size:1.6rem;color:var(--accent)}
.card__links a{font-family:var(--mono);font-size:.82rem;color:var(--muted);transition:color .2s}
.card__links a:hover{color:var(--accent)}
.card__title{font-size:1.2rem;font-weight:700}
.card__date{font-family:var(--mono);font-size:.78rem;color:var(--accent)}
.card__desc{color:var(--muted);font-size:.94rem;flex:1}

/* ===== Publication ===== */
.pub{
  background:linear-gradient(135deg,var(--card),var(--card-2));
  border:1px solid var(--line);border-radius:var(--radius);padding:34px;position:relative;max-width:860px;
}
.pub__badge{
  display:inline-block;font-family:var(--mono);font-size:.78rem;color:var(--accent-3);
  border:1px solid var(--accent-3);padding:5px 12px;border-radius:30px;margin-bottom:16px;
  background:rgba(183,140,255,.08);
}
.pub h3{font-size:1.35rem;font-weight:700;margin-bottom:8px}
.pub__meta{color:var(--accent-2);font-size:.9rem;margin-bottom:16px}
.pub p:last-child{color:var(--muted)}

/* ===== Skills ===== */
.skills{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px}
.skill-group{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.skill-group h4{font-size:1rem;margin-bottom:16px;color:var(--text);display:flex;align-items:center;gap:8px}
.skill-group h4::before{content:'#';color:var(--accent);font-family:var(--mono)}

/* ===== Achievements ===== */
.ach{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:18px}
.ach__item{display:flex;gap:16px;background:var(--card);border:1px solid var(--line);
  border-radius:var(--radius);padding:22px;transition:border-color .2s,transform .2s}
.ach__item:hover{border-color:var(--accent);transform:translateY(-3px)}
.ach__icon{color:var(--accent);font-size:1.1rem;margin-top:3px}
.ach__item h4{font-size:1.02rem;margin-bottom:5px}
.ach__item p{color:var(--muted);font-size:.9rem}
.ach__item a{color:var(--accent-2);border-bottom:1px solid transparent;transition:border-color .2s}
.ach__item a:hover{border-color:var(--accent-2)}

/* ===== Contact ===== */
.contact{display:grid;grid-template-columns:1.3fr .9fr;gap:44px;align-items:start}
.contact__lead{grid-column:1/-1;color:var(--muted);font-size:1.1rem;max-width:640px;margin-bottom:6px}
.contact__form{display:flex;flex-direction:column;gap:18px}
.field{display:flex;flex-direction:column;gap:7px}
.field label{font-family:var(--mono);font-size:.82rem;color:var(--muted)}
.field input,.field textarea{
  background:var(--card);border:1px solid var(--line);border-radius:10px;
  padding:13px 15px;color:var(--text);font-family:var(--sans);font-size:.95rem;
  transition:border-color .2s,box-shadow .2s;resize:vertical;
}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(84,240,200,.1)}
.field input::placeholder,.field textarea::placeholder{color:#4d566d}
.form-note{font-family:var(--mono);font-size:.85rem;min-height:1.2em}
.form-note.ok{color:var(--accent)}
.form-note.err{color:#ff6b81}
.contact__aside{display:flex;flex-direction:column;gap:14px;padding-top:8px}
.contact__link{
  font-family:var(--mono);font-size:.9rem;color:var(--muted);
  border:1px solid var(--line);border-radius:10px;padding:14px 16px;
  transition:color .2s,border-color .2s,transform .2s;
}
.contact__link:hover{color:var(--accent);border-color:var(--accent);transform:translateX(4px)}

/* ===== Footer ===== */
.footer{
  border-top:1px solid var(--line);margin-top:40px;
  padding:30px clamp(20px,5vw,40px);max-width:var(--max);margin-left:auto;margin-right:auto;
  display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;
}
.footer p{font-family:var(--mono);font-size:.82rem;color:var(--muted)}
.footer__top{font-family:var(--mono);font-size:.82rem;color:var(--accent)}

/* ===== Reveal animation ===== */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s cubic-bezier(.2,.7,.2,1),transform .7s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

/* ===== Responsive ===== */
@media(max-width:880px){
  .contact{grid-template-columns:1fr}
  .hero__stats{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:720px){
  .nav__links{
    position:fixed;inset:0 0 0 auto;width:min(78vw,320px);
    flex-direction:column;justify-content:center;gap:32px;
    background:rgba(12,15,24,.97);backdrop-filter:blur(16px);
    border-left:1px solid var(--line);transform:translateX(100%);transition:transform .3s;
  }
  .nav__links.open{transform:translateX(0)}
  .nav__links a{font-size:1.1rem}
  .nav__toggle{display:flex;z-index:60}
  .tl-item__top{flex-direction:column;gap:4px}
}
@media(max-width:460px){
  .hero__stats{grid-template-columns:1fr 1fr}
  .stat__num{font-size:1.4rem}
  .btn{width:100%;justify-content:center}
}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
}