/* ---------------------------------------------------------
   Narendra Dev Vijayakumar — personal site
   Palette: Deep Space Navy / Beam Gold / Cherenkov Teal
   Type: Fraunces (display) · Karla (body) · IBM Plex Mono (labels)
---------------------------------------------------------- */
:root{
  --bg:#0A1526;
  --panel:#111F36;
  --panel-2:#0E1B30;
  --ink:#E9EFF8;
  --muted:#8CA0BC;
  --gold:#F2C14E;
  --teal:#2EC4B6;
  --line:rgba(140,160,188,.18);
  --maxw:1080px;
  --font-display:"Fraunces", Georgia, "Times New Roman", serif;
  --font-body:"Karla", "Segoe UI", system-ui, sans-serif;
  --font-mono:"IBM Plex Mono", ui-monospace, "Courier New", monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--bg);color:var(--ink);
  font-family:var(--font-body);font-size:17px;line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--gold);text-decoration:none}
a:hover{text-decoration:underline}
a:focus-visible,button:focus-visible{outline:2px solid var(--teal);outline-offset:3px;border-radius:2px}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ---- nav ---- */
nav{
  position:sticky;top:0;z-index:50;
  background:rgba(10,21,38,.85);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
nav .wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{font-family:var(--font-mono);font-size:.85rem;letter-spacing:.08em;color:var(--ink)}
.brand b{color:var(--gold);font-weight:600}
nav ul{display:flex;gap:26px;list-style:none}
nav ul a{color:var(--muted);font-size:.92rem;letter-spacing:.02em}
nav ul a:hover{color:var(--ink);text-decoration:none}
nav ul a.active{color:var(--gold)}

/* ---- typography ---- */
.eyebrow{
  font-family:var(--font-mono);font-size:.75rem;letter-spacing:.22em;
  text-transform:uppercase;color:var(--teal);margin-bottom:14px;
}
h1{font-family:var(--font-display);font-weight:550;font-size:clamp(2.2rem,5vw,3.6rem);line-height:1.12;letter-spacing:-.01em}
h2{font-family:var(--font-display);font-weight:520;font-size:clamp(1.5rem,3vw,2.1rem);line-height:1.2;margin-bottom:16px}
h3{font-family:var(--font-body);font-weight:700;font-size:1.05rem;margin-bottom:8px}
.lead{color:var(--muted);font-size:1.12rem;max-width:640px}
.gold{color:var(--gold)}

/* ---- sections ---- */
section{padding:72px 0}
.hero{padding:110px 0 60px}
.hero .lead{margin-top:22px}
.divider{border:none;border-top:1px solid var(--line)}

/* ---- beamline (signature element, home page) ---- */
.beamline{padding:56px 0 80px}
.beamline svg{width:100%;height:auto;display:block}
.beam-label{font-family:var(--font-mono);font-size:11px;fill:var(--muted)}
.beam-stage{font-family:var(--font-body);font-weight:700;font-size:13px;fill:var(--ink)}
@media (prefers-reduced-motion: no-preference){
  .beam-pulse{animation:beam 6s linear infinite}
  @keyframes beam{from{stroke-dashoffset:600}to{stroke-dashoffset:0}}
}

/* ---- cards ---- */
.grid{display:grid;gap:20px}
.grid.cols-3{grid-template-columns:repeat(3,1fr)}
.grid.cols-2{grid-template-columns:repeat(2,1fr)}
.card{
  background:var(--panel);border:1px solid var(--line);border-radius:12px;
  padding:26px;transition:transform .18s ease, border-color .18s ease;
}
.card:hover{transform:translateY(-3px);border-color:rgba(242,193,78,.45)}
.card p{color:var(--muted);font-size:.95rem}
.card .eyebrow{margin-bottom:8px}
.card a.more{display:inline-block;margin-top:14px;font-size:.9rem}

/* ---- stack / tag chips ---- */
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.chip{
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.03em;
  border:1px solid var(--line);border-radius:999px;padding:4px 11px;color:var(--muted);
}
.chip.hot{border-color:rgba(242,193,78,.5);color:var(--gold)}

/* ---- timeline (expertise page) ---- */
.timeline{border-left:2px solid var(--line);margin:28px 0;padding-left:28px;display:grid;gap:28px}
.tl-item{position:relative}
.tl-item::before{
  content:"";position:absolute;left:-35px;top:6px;width:11px;height:11px;border-radius:50%;
  background:var(--gold);box-shadow:0 0 0 4px rgba(242,193,78,.15);
}
.tl-item .when{font-family:var(--font-mono);font-size:.75rem;color:var(--teal);letter-spacing:.1em}
.tl-item p{color:var(--muted);font-size:.95rem;margin-top:4px}

/* ---- graph embed ---- */
.graph-frame{
  width:100%;height:640px;border:1px solid var(--line);border-radius:12px;
  background:var(--bg);
}

/* ---- galleries (interests page) ---- */
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.gallery .ph{
  aspect-ratio:4/3;border-radius:10px;overflow:hidden;position:relative;
  background:linear-gradient(145deg,var(--panel),var(--panel-2));
  border:1px dashed var(--line);
  display:flex;align-items:center;justify-content:center;
  color:var(--muted);font-family:var(--font-mono);font-size:.72rem;text-align:center;padding:10px;
}
.gallery img{width:100%;height:100%;object-fit:cover}
.caption{font-size:.85rem;color:var(--muted);margin-top:8px}

/* ---- footer ---- */
footer{border-top:1px solid var(--line);padding:44px 0;margin-top:40px}
footer .wrap{display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap}
footer p{color:var(--muted);font-size:.85rem}
footer .links{display:flex;gap:18px;font-size:.9rem}

/* ---- responsive ---- */
@media (max-width:860px){
  .grid.cols-3,.grid.cols-2{grid-template-columns:1fr}
  .gallery{grid-template-columns:repeat(2,1fr)}
  nav ul{gap:16px}
  section{padding:52px 0}
  .hero{padding:80px 0 40px}
}
@media (max-width:520px){
  .gallery{grid-template-columns:1fr}
  nav ul a{font-size:.82rem}
}

/* =========================================================
   v2 additions: atmosphere, bento grid, masonry, lightbox
========================================================= */

/* ---- hero atmosphere: glows + particle canvas ---- */
.hero{position:relative;overflow:visible}
.atmosphere{
  position:absolute;inset:0;z-index:-1;overflow:hidden;pointer-events:none;
}
.atmosphere::before,.atmosphere::after{
  content:"";position:absolute;border-radius:50%;filter:blur(90px);
}
.atmosphere::before{ /* gold glow, upper right */
  width:520px;height:520px;right:-160px;top:-180px;
  background:radial-gradient(circle, rgba(242,193,78,.14), transparent 65%);
}
.atmosphere::after{ /* teal glow, lower left */
  width:460px;height:460px;left:-180px;bottom:-160px;
  background:radial-gradient(circle, rgba(46,196,182,.10), transparent 65%);
}
#particles{position:absolute;inset:0;width:100%;height:100%;z-index:-1;pointer-events:none}

/* ---- bento grid (projects) ---- */
.bento{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.bento .card.feature{
  grid-column:span 2;grid-row:span 2;
  display:flex;flex-direction:column;justify-content:flex-start;
  background:linear-gradient(160deg, var(--panel) 0%, #14263f 100%);
  border-color:rgba(242,193,78,.35);
}
.bento .card.feature h3{font-family:var(--font-display);font-size:1.5rem;font-weight:550}
.bento .card.feature p{font-size:1rem}
.bento .card.wide{grid-column:span 2}
@media (max-width:860px){
  .bento{grid-template-columns:1fr}
  .bento .card.feature,.bento .card.wide{grid-column:auto;grid-row:auto}
}

/* ---- section banner (own photo + overlay) ---- */
.banner{
  position:relative;border-radius:14px;overflow:hidden;height:220px;margin-bottom:34px;
  border:1px solid var(--line);
  background:linear-gradient(145deg,var(--panel),var(--panel-2)); /* fallback if no image */
}
.banner img{width:100%;height:100%;object-fit:cover}
.banner .overlay{
  position:absolute;inset:0;display:flex;align-items:flex-end;padding:22px 26px;
  background:linear-gradient(to top, rgba(10,21,38,.92) 0%, rgba(10,21,38,.35) 55%, rgba(10,21,38,.15) 100%);
}
.banner .overlay h2{margin:0}
.banner .overlay .eyebrow{margin-bottom:4px}
.banner .ph-note{
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  color:var(--muted);font-family:var(--font-mono);font-size:.72rem;text-align:center;padding:12px;
}

/* ---- masonry galleries ---- */
.masonry{columns:3;column-gap:14px}
.masonry figure{break-inside:avoid;margin:0 0 14px;position:relative}
.masonry img{width:100%;border-radius:10px;cursor:zoom-in;display:block;
  transition:transform .18s ease, box-shadow .18s ease}
.masonry img:hover{transform:scale(1.015);box-shadow:0 8px 28px rgba(0,0,0,.45)}
.masonry figcaption{font-size:.8rem;color:var(--muted);margin-top:6px;font-family:var(--font-mono)}
.masonry .ph{ /* placeholder slot until photos are added */
  border:1px dashed var(--line);border-radius:10px;
  background:linear-gradient(145deg,var(--panel),var(--panel-2));
  display:flex;align-items:center;justify-content:center;text-align:center;
  color:var(--muted);font-family:var(--font-mono);font-size:.72rem;padding:12px;margin:0 0 14px;
  break-inside:avoid;
}
/* varied placeholder heights to preview the masonry rhythm */
.masonry .ph.h1{height:180px}.masonry .ph.h2{height:260px}.masonry .ph.h3{height:220px}
@media (max-width:860px){.masonry{columns:2}}
@media (max-width:520px){.masonry{columns:1}}

/* ---- lightbox ---- */
#lightbox{
  position:fixed;inset:0;z-index:100;display:none;
  background:rgba(6,12,22,.94);backdrop-filter:blur(4px);
  align-items:center;justify-content:center;flex-direction:column;padding:4vh 4vw;
}
#lightbox.open{display:flex}
#lightbox img{max-width:92vw;max-height:82vh;border-radius:8px;box-shadow:0 20px 60px rgba(0,0,0,.6)}
#lightbox .lb-caption{color:var(--muted);font-size:.85rem;margin-top:14px;font-family:var(--font-mono)}
#lightbox .lb-close{
  position:fixed;top:18px;right:24px;background:none;border:1px solid var(--line);
  color:var(--ink);border-radius:999px;width:40px;height:40px;font-size:1.1rem;cursor:pointer;
}
#lightbox .lb-close:hover{border-color:var(--gold);color:var(--gold)}