/* ============================================================
   Sidhant R. Nair — Portfolio  ·  Dark Workstation system
   Shared stylesheet for index / research / projects / cv
   ============================================================ */

:root{
  --bg:#0d0f10;
  --panel:#14171a;
  --panel2:#181c20;
  --ink:#e7e9e6;
  --muted:#8b948f;
  --faint:#5a635e;
  --line:#23282c;
  --accent:oklch(0.78 0.13 165);   /* muted signal green */
  --accent-dim:color-mix(in oklab, var(--accent) 14%, transparent);
  --bar-bg:rgba(13,15,16,.82);
  --panel-deep:#0f1213;
  --inset:rgba(255,255,255,.012);
  --maxw:1240px;
  --rad:8px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--bg);color:var(--ink);
  font-family:"IBM Plex Sans",sans-serif;
  -webkit-font-smoothing:antialiased;line-height:1.55;
  background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:64px 64px;background-position:center top;
  min-height:100vh;
}
a{color:inherit;text-decoration:none}
.mono{font-family:"IBM Plex Mono",monospace}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 32px}
.accent{color:var(--accent)}

/* ---- top nav bar (shared) ---- */
.bar{position:sticky;top:0;z-index:30;background:var(--bar-bg);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.bar .wrap{display:flex;align-items:center;justify-content:space-between;height:52px;font-family:"IBM Plex Mono",monospace;font-size:12px}
.bar .left{display:flex;align-items:center;gap:10px;min-width:0}
.bar .left .who{color:var(--ink)}
.bar .left .who b{color:var(--accent);font-weight:500}
.bar .left .status{color:var(--faint)}
.dot{width:7px;height:7px;border-radius:50%;background:var(--accent);box-shadow:0 0 8px var(--accent);flex:none}
.bar nav{display:flex;gap:6px;align-items:center}
.bar nav a{color:var(--muted);padding:6px 12px;border-radius:6px;transition:.15s}
.bar nav a:hover{color:var(--accent)}
.bar nav a.active{color:var(--accent);background:var(--accent-dim)}

@media(max-width:720px){
  .bar .left .status{display:none}
  .bar nav a{padding:6px 9px}
}

/* ---- section heading (shared) ---- */
section{padding:46px 0}
.sh{display:flex;align-items:center;gap:14px;margin-bottom:26px;font-family:"IBM Plex Mono",monospace}
.sh .idx{color:var(--accent);font-size:12px}
.sh h2{font-size:13px;font-weight:500;letter-spacing:.14em;text-transform:uppercase;color:var(--ink)}
.sh .grow{flex:1;height:1px;background:var(--line)}
.sh .count{color:var(--faint);font-size:12px}

/* ---- page header (interior pages) ---- */
.phead{padding:58px 0 14px}
.phead .crumb{font-family:"IBM Plex Mono",monospace;font-size:12px;color:var(--faint);margin-bottom:18px}
.phead .crumb b{color:var(--accent);font-weight:400}
.phead h1{font-size:clamp(34px,5vw,56px);font-weight:600;letter-spacing:-.025em;line-height:1.02}
.phead p{font-size:16px;color:#c4cac6;max-width:62ch;margin-top:18px}
.phead p b{color:var(--ink);font-weight:600}

/* ---- buttons / links ---- */
.runlinks{display:flex;gap:10px;flex-wrap:wrap}
.runlinks a{font-family:"IBM Plex Mono",monospace;font-size:12px;border:1px solid var(--line);background:var(--panel2);padding:9px 14px;border-radius:5px;color:var(--muted);transition:all .16s}
.runlinks a:hover{border-color:var(--accent);color:var(--accent)}
.btn{display:inline-flex;align-items:center;gap:8px;font-family:"IBM Plex Mono",monospace;font-size:12.5px;border:1px solid var(--line);background:var(--panel2);padding:11px 18px;border-radius:6px;color:var(--ink);transition:.16s}
.btn:hover{border-color:var(--accent);color:var(--accent)}
.btn.solid{background:var(--accent);color:#0a0c0b;border-color:var(--accent);font-weight:600}
.btn.solid:hover{filter:brightness(1.08);color:#0a0c0b}

/* ---- stat strip ---- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.stat{border:1px solid var(--line);background:var(--panel);border-radius:7px;padding:20px}
.stat .v{font-family:"IBM Plex Mono",monospace;font-size:24px;color:var(--accent);margin-bottom:6px}
.stat .l{font-size:12.5px;color:var(--muted);line-height:1.4}

/* ---- publications ---- */
.pub{display:grid;grid-template-columns:auto 1fr auto;gap:20px;align-items:center;border:1px solid var(--line);background:var(--panel);border-radius:7px;padding:18px 20px;margin-bottom:10px;transition:border-color .16s}
.pub:hover{border-color:#2f3b38}
.pub .tag{font-family:"IBM Plex Mono",monospace;font-size:10.5px;padding:4px 8px;border-radius:4px;background:var(--accent-dim);color:var(--accent);white-space:nowrap}
.pub .tag.rev{background:rgba(255,255,255,.05);color:var(--muted)}
.pub h3{font-size:16px;font-weight:500;letter-spacing:-.01em;line-height:1.3}
.pub h3 small{display:block;color:var(--muted);font-family:"IBM Plex Mono",monospace;font-size:11.5px;font-weight:400;margin-top:5px}
.pub .ax{font-family:"IBM Plex Mono",monospace;font-size:11.5px;color:var(--faint);white-space:nowrap}
.pub:hover .ax{color:var(--accent)}

/* detailed publication (research page) */
.pubd{border:1px solid var(--line);background:var(--panel);border-radius:var(--rad);padding:24px 26px;margin-bottom:14px;transition:border-color .16s}
.pubd:hover{border-color:#2f3b38}
.pubd .meta{display:flex;align-items:center;gap:10px;margin-bottom:13px;flex-wrap:wrap}
.pubd .tag{font-family:"IBM Plex Mono",monospace;font-size:10.5px;padding:4px 9px;border-radius:4px;background:var(--accent-dim);color:var(--accent)}
.pubd .tag.rev{background:rgba(255,255,255,.05);color:var(--muted)}
.pubd .date{font-family:"IBM Plex Mono",monospace;font-size:11.5px;color:var(--faint)}
.pubd h3{font-size:20px;font-weight:600;letter-spacing:-.01em;line-height:1.28;margin-bottom:8px}
.pubd .venue{font-size:14px;color:var(--muted);margin-bottom:14px}
.pubd .venue b{color:var(--ink);font-weight:500}
.pubd p{font-size:14.5px;color:#c4cac6;line-height:1.6;max-width:74ch}
.pubd .foot{display:flex;gap:10px;margin-top:16px;flex-wrap:wrap}

/* ---- project cards ---- */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.grid.two{grid-template-columns:repeat(2,1fr)}
.card{border:1px solid var(--line);background:var(--panel);border-radius:var(--rad);padding:20px;display:flex;flex-direction:column;gap:12px;min-height:188px;transition:transform .16s,border-color .16s}
.card:hover{transform:translateY(-3px);border-color:#2f3b38}
.card .ch{display:flex;justify-content:space-between;align-items:center;gap:10px}
.card h3{font-size:15.5px;font-weight:600;line-height:1.2}
.card .gh{font-family:"IBM Plex Mono",monospace;font-size:11px;color:var(--faint);flex:none}
.card:hover .gh{color:var(--accent)}
.card p{font-size:13px;color:var(--muted);line-height:1.5;flex:1}
.card .metric{font-family:"IBM Plex Mono",monospace;font-size:11.5px;color:var(--accent)}
.card .tags{display:flex;gap:6px;flex-wrap:wrap}
.card .tags span{font-family:"IBM Plex Mono",monospace;font-size:10px;color:var(--faint);border:1px solid var(--line);padding:2px 6px;border-radius:3px}

/* group label */
.grouplabel{display:flex;align-items:center;gap:12px;margin:34px 0 16px;font-family:"IBM Plex Mono",monospace}
.grouplabel .gi{color:var(--accent);font-size:12px}
.grouplabel h3{font-size:12.5px;font-weight:500;letter-spacing:.12em;text-transform:uppercase;color:var(--ink)}
.grouplabel .grow{flex:1;height:1px;background:var(--line)}
.grouplabel .gc{color:var(--faint);font-size:11.5px}

/* ---- experience ---- */
.exp{border:1px solid var(--line);border-radius:var(--rad);overflow:hidden}
.erow{display:grid;grid-template-columns:210px 1fr 140px;gap:20px;padding:18px 22px;border-bottom:1px solid var(--line);align-items:baseline;background:var(--panel)}
.erow:last-child{border-bottom:0}
.erow .org{font-weight:600;font-size:15px}
.erow .org small{display:block;color:var(--faint);font-family:"IBM Plex Mono",monospace;font-size:11px;margin-top:4px;font-weight:400}
.erow .desc{font-size:13.5px;color:var(--muted)}
.erow .when{font-family:"IBM Plex Mono",monospace;font-size:11.5px;color:var(--faint);text-align:right}

/* detailed experience (research/cv pages) */
.expd{border:1px solid var(--line);background:var(--panel);border-radius:var(--rad);padding:24px 26px;margin-bottom:14px}
.expd .top{display:flex;justify-content:space-between;align-items:baseline;gap:18px;flex-wrap:wrap;margin-bottom:6px}
.expd .org{font-size:18px;font-weight:600}
.expd .when{font-family:"IBM Plex Mono",monospace;font-size:12px;color:var(--faint);white-space:nowrap}
.expd .sub{font-size:13.5px;color:var(--accent);font-family:"IBM Plex Mono",monospace;margin-bottom:14px}
.expd ul{list-style:none;display:flex;flex-direction:column;gap:9px}
.expd ul li{font-size:14px;color:#c4cac6;line-height:1.55;padding-left:20px;position:relative;max-width:80ch}
.expd ul li::before{content:"→";position:absolute;left:0;color:var(--faint);font-family:"IBM Plex Mono",monospace}
.expd ul li b{color:var(--ink);font-weight:600}

/* ---- skills / kv table ---- */
.skills{display:grid;grid-template-columns:170px 1fr;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--rad);overflow:hidden}
.skills .k{background:var(--panel);padding:14px 18px;font-family:"IBM Plex Mono",monospace;font-size:11.5px;color:var(--faint)}
.skills .vv{background:var(--panel);padding:14px 18px;display:flex;gap:7px;flex-wrap:wrap}
.skills .vv span{font-size:12.5px;color:var(--ink);background:var(--panel2);border:1px solid var(--line);padding:3px 9px;border-radius:5px}

/* ---- simple cv rows ---- */
.cvrow{display:grid;grid-template-columns:1fr 160px;gap:18px;padding:16px 0;border-bottom:1px solid var(--line);align-items:baseline}
.cvrow:last-child{border-bottom:0}
.cvrow .t{font-size:15.5px;font-weight:600}
.cvrow .t small{display:block;color:var(--muted);font-weight:400;font-size:13.5px;margin-top:4px}
.cvrow .r{font-family:"IBM Plex Mono",monospace;font-size:12px;color:var(--faint);text-align:right}
.cvlist{display:flex;flex-direction:column;gap:11px}
.cvlist li{list-style:none;font-size:14.5px;color:#c4cac6;line-height:1.55;padding-left:22px;position:relative;max-width:84ch}
.cvlist li::before{content:"▹";position:absolute;left:0;color:var(--accent)}
.cvlist li b{color:var(--ink);font-weight:600}

/* references grid */
.refs{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.ref{border:1px solid var(--line);background:var(--panel);border-radius:7px;padding:18px 20px}
.ref .n{font-size:15px;font-weight:600}
.ref .a{font-size:13px;color:var(--muted);margin-top:5px;line-height:1.45}

/* ---- footer (shared) ---- */
footer.site{padding:54px 0 70px}
.fcon{border:1px solid var(--line);border-radius:var(--rad);background:linear-gradient(180deg,var(--panel),var(--panel-deep));padding:40px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:20px}
.fcon .big{font-size:24px;font-weight:600;letter-spacing:-.01em}
.fcon .big a{color:var(--accent)}
.fcon .big .sub{display:block;font-size:13px;color:var(--muted);font-weight:400;font-family:"IBM Plex Mono",monospace;margin-top:8px}
.fcon .meta{font-family:"IBM Plex Mono",monospace;font-size:11.5px;color:var(--faint);text-align:right}
.fcon .meta a{color:var(--muted)}
.fcon .meta a:hover{color:var(--accent)}

@media(max-width:880px){
  .stats{grid-template-columns:repeat(2,1fr)}
  .grid,.grid.two{grid-template-columns:1fr}
  .erow{grid-template-columns:1fr;gap:6px}
  .erow .when{text-align:left}
  .pub{grid-template-columns:auto 1fr}.pub .ax{display:none}
  .skills{grid-template-columns:1fr}
  .refs{grid-template-columns:1fr}
  .cvrow{grid-template-columns:1fr;gap:6px}
  .cvrow .r{text-align:left}
  .fcon{flex-direction:column;align-items:flex-start}
  .fcon .meta{text-align:left}
}

/* ============================================================
   THEME VARIANTS  ·  light mode + density + reveal + panel
   ============================================================ */

/* smooth transition when switching themes */
body,.bar,.card,.pub,.pubd,.expd,.stat,.console,.fcon,.skills .k,.skills .vv,.ref,.runlinks a,.btn{
  transition:background-color .3s ease,border-color .3s ease,color .25s ease;
}

/* ---- LIGHT THEME ---- */
[data-theme="light"]{
  --bg:#f7f6f3;
  --panel:#ffffff;
  --panel2:#f0eee8;
  --ink:#1b1813;
  --muted:#6c675e;
  --faint:#a59f94;
  --line:#e4dfd5;
  --bar-bg:rgba(247,246,243,.85);
  --panel-deep:#edeae3;
  --inset:rgba(0,0,0,.022);
}
/* lift the body-copy greys to readable ink in light mode */
[data-theme="light"] .phead p,
[data-theme="light"] .lede,
[data-theme="light"] .pubd p,
[data-theme="light"] .expd ul li,
[data-theme="light"] .summary,
[data-theme="light"] .cvlist li,
[data-theme="light"] .erow .desc{color:#3a372e}
[data-theme="light"] .console .chrome .lights i{background:#d8d4cb}
[data-theme="light"] .pub h3 small{color:var(--muted)}

/* ---- DENSITY: COMPACT ---- */
[data-density="compact"] section{padding:28px 0}
[data-density="compact"] .phead{padding:38px 0 8px}
[data-density="compact"] .sh{margin-bottom:18px}
[data-density="compact"] .card{min-height:148px;padding:16px;gap:9px}
[data-density="compact"] .pubd{padding:18px 20px;margin-bottom:10px}
[data-density="compact"] .expd{padding:18px 20px;margin-bottom:10px}
[data-density="compact"] .stat{padding:15px}
[data-density="compact"] .grid{gap:10px}
[data-density="compact"] .pub{padding:14px 18px}
[data-density="compact"] .cvrow{padding:13px 0}

/* ---- SCROLL REVEAL ---- */
@media (prefers-reduced-motion: no-preference){
  [data-reveal]{opacity:0;transform:translateY(16px);transition:opacity .55s ease,transform .55s cubic-bezier(.2,.7,.2,1)}
  [data-reveal].revealed{opacity:1;transform:none}
}

/* ---- THEME PANEL ---- */
#srn-fab{position:fixed;right:18px;bottom:18px;z-index:60;width:42px;height:42px;border-radius:50%;
  border:1px solid var(--line);background:var(--panel);color:var(--muted);cursor:pointer;
  display:flex;align-items:center;justify-content:center;box-shadow:0 6px 22px -10px rgba(0,0,0,.55);transition:.18s}
#srn-fab:hover{color:var(--accent);border-color:var(--accent);transform:translateY(-2px)}
#srn-fab svg{width:19px;height:19px;display:block}
#srn-panel{position:fixed;right:18px;bottom:70px;z-index:60;width:248px;
  border:1px solid var(--line);background:var(--panel);border-radius:12px;padding:16px;
  box-shadow:0 18px 50px -18px rgba(0,0,0,.7);font-family:"IBM Plex Mono",monospace;
  opacity:0;transform:translateY(8px) scale(.98);pointer-events:none;transition:.18s}
#srn-panel.open{opacity:1;transform:none;pointer-events:auto}
#srn-panel .grp{margin-bottom:15px}
#srn-panel .grp:last-child{margin-bottom:0}
#srn-panel .lbl{font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--faint);margin-bottom:8px}
#srn-panel .seg{display:flex;gap:6px}
#srn-panel .seg button{flex:1;font-family:inherit;font-size:11.5px;padding:7px 0;border-radius:6px;
  border:1px solid var(--line);background:var(--panel2);color:var(--muted);cursor:pointer;transition:.15s}
#srn-panel .seg button:hover{color:var(--ink)}
#srn-panel .seg button.on{border-color:var(--accent);color:var(--accent);background:var(--accent-dim)}
#srn-panel .swatches{display:flex;gap:8px}
#srn-panel .swatches button{width:30px;height:30px;border-radius:8px;border:2px solid transparent;cursor:pointer;padding:0;position:relative;transition:.15s}
#srn-panel .swatches button:hover{transform:scale(1.08)}
#srn-panel .swatches button.on{border-color:var(--ink)}
#srn-panel .swatches button.on::after{content:"";position:absolute;inset:0;margin:auto;width:7px;height:7px;border-radius:50%;background:#0a0c0b}