:root{
  --bg:#0b0f1a;
  --bg-panel:#10162660;
  --bg-substrate:#0a1120;
  --line: rgba(79,209,197,0.16);
  --line-strong: rgba(79,209,197,0.4);
  --cyan:#4fd1c5;
  --copper:#e8a33d;
  --text:#e9edf5;
  --muted:#8a93a6;
  --muted-dim:#5c6478;
  --radius:10px;
  --maxw:920px;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *{animation-duration:0.001ms !important; transition-duration:0.001ms !important;}
}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:'IBM Plex Sans', sans-serif;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--cyan); text-decoration:none;}
a:hover{text-decoration:underline;}
a:focus-visible, button:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
  border-radius:4px;
}
h1,h2,h3{font-family:'Space Grotesk', sans-serif; margin:0; letter-spacing:-0.01em;}
.mono{font-family:'JetBrains Mono', monospace;}

/* skip-link */
.skip-link{
  position:absolute;
  left:-999px;
  top:auto;
  width:1px;
  height:1px;
  overflow:hidden;
  background:var(--cyan);
  color:#06121a;
  padding:8px 12px;
  border-radius:6px;
  z-index:60;
}
.skip-link:focus{
  left:16px;
  top:16px;
  width:auto;
  height:auto;
}

/* ---------- background circuit texture ---------- */
body::before{
  content:"";
  position:fixed; inset:0; z-index:-1;
  background-image:
    radial-gradient(circle at 15% 8%, rgba(79,209,197,0.06), transparent 40%),
    radial-gradient(circle at 85% 92%, rgba(232,163,61,0.05), transparent 40%);
}

/* ---------- status bar ---------- */
.statusbar{
  position:sticky; top:0; z-index:50;
  display:flex; align-items:center; justify-content:space-between;
  padding:14px 28px;
  background:rgba(11,15,26,0.85);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
  font-size:13px;
}
.statusbar .path{color:var(--muted);}
.statusbar .path b{color:var(--cyan); font-weight:400;}
.statusbar nav a{color:var(--muted); margin-left:18px; font-size:13px;}
.statusbar nav a:hover{color:var(--cyan); text-decoration:none;}

/* ---------- layer rail (desktop signature element) ---------- */
.rail{
  position:fixed; left:32px; top:50%; transform:translateY(-50%);
  z-index:40;
  display:flex; flex-direction:column; align-items:flex-start; gap:0;
}
.rail::before{
  content:"";
  position:absolute; left:5px; top:6px; bottom:6px; width:1px;
  background:linear-gradient(to bottom, transparent, var(--line-strong) 10%, var(--line-strong) 90%, transparent);
}
.rail-tick{
  position:relative;
  display:flex; align-items:center; gap:10px;
  padding:14px 0;
  cursor:pointer; background:none; border:none;
  font-family:'JetBrains Mono', monospace;
  font-size:10.5px; letter-spacing:0.12em;
  color:var(--muted-dim);
  transition:color 0.3s ease;
}
.rail-tick .via{
  width:11px; height:11px; border-radius:50%;
  background:var(--bg); border:1.5px solid var(--muted-dim);
  transition:all 0.3s ease;
  flex-shrink:0;
}
.rail-tick.active{color:var(--cyan);}
.rail-tick.active .via{
  border-color:var(--cyan); background:var(--cyan);
  box-shadow:0 0 10px 2px rgba(79,209,197,0.5);
}
@media (max-width:1180px){ .rail{display:none;} }

/* ---------- layout ---------- */
section{ padding:110px 28px; }
.inner{ max-width:var(--maxw); margin:0 auto; }
.eyebrow{
  font-family:'JetBrains Mono', monospace;
  font-size:12px; letter-spacing:0.15em;
  color:var(--copper);
  display:flex; align-items:center; gap:10px;
  margin-bottom:18px;
}
.eyebrow::before{ content:"//"; color:var(--muted-dim); }

/* ---------- hero ---------- */
.hero{ padding:130px 28px 90px; }
.hero .inner{ max-width:760px; }
.hero .greet{
  font-family:'JetBrains Mono', monospace; font-size:14px; color:var(--muted);
  margin-bottom:22px;
}
.hero .greet .cursor{
  display:inline-block; width:8px; height:16px; background:var(--cyan);
  margin-left:2px; animation:blink 1s step-end infinite; vertical-align:-2px;
}
@keyframes blink{ 50%{opacity:0;} }
.hero h1{ font-size:clamp(38px,6vw,58px); font-weight:700; }
.hero h1 span{ color:var(--cyan); }
.hero .role{
  font-family:'JetBrains Mono', monospace;
  font-size:16px; color:var(--muted); margin-top:14px;
}
.hero p.lede{
  margin-top:26px; font-size:17px; color:var(--text); max-width:60ch;
}
.hero .cta-row{ display:flex; gap:14px; margin-top:36px; flex-wrap:wrap; }
.btn{
  font-family:'JetBrains Mono', monospace; font-size:13px;
  padding:11px 18px; border-radius:6px;
  border:1px solid var(--line-strong);
  color:var(--text); text-decoration:none;
  transition:all 0.2s ease;
  display:inline-flex; align-items:center; gap:8px;
}
.btn:hover{ border-color:var(--cyan); color:var(--cyan); background:rgba(79,209,197,0.06); text-decoration:none; }
.btn.primary{ background:var(--cyan); color:#06121a; border-color:var(--cyan); font-weight:500; }
.btn.primary:hover{ background:#6adfd3; color:#06121a; }

/* ---------- about ---------- */
#about p{ color:#c7cee0; font-size:16px; max-width:62ch; }
.edu-strip{
  margin-top:28px; padding:16px 20px; border:1px solid var(--line);
  border-radius:var(--radius); background:var(--bg-panel);
  display:flex; flex-wrap:wrap; gap:8px 20px; align-items:baseline;
  font-size:14.5px;
}
.edu-strip .cgpa{ font-family:'JetBrains Mono', monospace; color:var(--cyan); }

/* ---------- highlights ---------- */
.hl-list{ display:flex; flex-direction:column; gap:0; margin-top:8px; }
.hl-item{
  display:grid; grid-template-columns:120px 1fr; gap:22px;
  padding:26px 0; border-top:1px solid var(--line);
}
.hl-item:last-child{ border-bottom:1px solid var(--line); }
.hl-date{ font-family:'JetBrains Mono', monospace; font-size:12.5px; color:var(--muted); padding-top:3px; }
.hl-title{ font-size:17px; font-weight:600; font-family:'Space Grotesk', sans-serif; }
.hl-desc{ margin-top:6px; color:var(--muted); font-size:14.5px; max-width:56ch; }
.hl-links{ margin-top:10px; display:flex; gap:16px; font-family:'JetBrains Mono', monospace; font-size:12.5px; }
@media (max-width:640px){
  .hl-item{ grid-template-columns:1fr; gap:6px; }
}

/* ---------- projects ---------- */
.proj-grid{ display:grid; grid-template-columns:1fr 1fr; gap:16px; margin-top:8px; }
@media (max-width:640px){ .proj-grid{ grid-template-columns:1fr; } }
.proj-card{
  border:1px solid var(--line); border-radius:var(--radius);
  padding:22px; background:var(--bg-panel);
  transition:transform 0.25s ease, border-color 0.25s ease;
}
.proj-card:hover{ transform:translateY(-3px); border-color:var(--line-strong); }
.proj-card h3{ font-size:16.5px; }
.proj-card h3 a{ color:var(--text); }
.proj-card h3 a:hover{ color:var(--cyan); }
.proj-card p{ margin:10px 0 0; color:var(--muted); font-size:14px; }
.proj-card .tags{ margin-top:14px; display:flex; flex-wrap:wrap; gap:6px; }
.proj-card .tags span{
  font-family:'JetBrains Mono', monospace; font-size:10.5px;
  padding:3px 8px; border-radius:4px; border:1px solid var(--line);
  color:var(--muted);
}

/* ---------- stack ---------- */
.chip-grid{ display:flex; flex-wrap:wrap; gap:10px; margin-top:8px; }
.chip{
  font-family:'JetBrains Mono', monospace; font-size:13px;
  padding:9px 16px; border-radius:6px;
  border:1px solid var(--line); color:var(--text);
  background:var(--bg-panel);
  position:relative;
}
.chip::before{ content:"◆"; color:var(--copper); font-size:8px; margin-right:8px; }

/* ---------- substrate (education) ---------- */
#substrate{
  background:
    linear-gradient(180deg, transparent, var(--bg-substrate) 15%),
    repeating-linear-gradient(90deg, rgba(79,209,197,0.035) 0 1px, transparent 1px 42px),
    repeating-linear-gradient(0deg, rgba(79,209,197,0.035) 0 1px, transparent 1px 42px);
  border-top:1px solid var(--line);
}
.cert-list{ margin-top:24px; display:flex; flex-direction:column; gap:14px; }
.cert-row{
  display:flex; justify-content:space-between; gap:16px; flex-wrap:wrap;
  padding:16px 20px; border:1px solid var(--line); border-radius:var(--radius);
  background:rgba(10,17,32,0.6);
  font-size:14.5px;
}
.cert-row .name{ font-weight:500; }
.cert-row .issuer{ color:var(--muted); font-size:13px; }
.cert-row .date{ font-family:'JetBrains Mono', monospace; color:var(--copper); font-size:12.5px; white-space:nowrap; }

/* ---------- footer ---------- */
footer{
  padding:70px 28px 50px; text-align:center;
  border-top:1px solid var(--line);
}
footer .links{ display:flex; gap:22px; justify-content:center; flex-wrap:wrap; margin-top:18px; }
footer .fine{ margin-top:30px; color:var(--muted-dim); font-size:12.5px; font-family:'JetBrains Mono', monospace; }

/* ---------- reveal on scroll ---------- */
.reveal{ opacity:0; transform:translateY(16px); transition:opacity 0.6s ease, transform 0.6s ease; }
.reveal.in{ opacity:1; transform:none; }