/* SpaceQuanta Lab v2: light default, teal/green accent, self-hosted IBM Plex, no external requests */
@font-face{font-family:"IBM Plex Sans";font-weight:400;font-style:normal;font-display:swap;src:url(fonts/ibm-plex-sans-latin-400-normal.woff2) format("woff2")}
@font-face{font-family:"IBM Plex Sans";font-weight:600;font-style:normal;font-display:swap;src:url(fonts/ibm-plex-sans-latin-600-normal.woff2) format("woff2")}
@font-face{font-family:"IBM Plex Serif";font-weight:600;font-style:normal;font-display:swap;src:url(fonts/ibm-plex-serif-latin-600-normal.woff2) format("woff2")}
@font-face{font-family:"IBM Plex Mono";font-weight:500;font-style:normal;font-display:swap;src:url(fonts/ibm-plex-mono-latin-500-normal.woff2) format("woff2")}
@font-face{font-family:"Noto Sans Tamil";font-weight:400;font-style:normal;font-display:swap;unicode-range:U+0B80-0BFF,U+200C-200D;src:url(fonts/noto-sans-tamil-tamil-400-normal.woff2) format("woff2")}
@font-face{font-family:"Noto Sans Tamil";font-weight:700;font-style:normal;font-display:swap;unicode-range:U+0B80-0BFF,U+200C-200D;src:url(fonts/noto-sans-tamil-tamil-700-normal.woff2) format("woff2")}

:root{
  --sans:"IBM Plex Sans","Noto Sans Tamil",system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --serif:"IBM Plex Serif","Noto Sans Tamil",Georgia,"Times New Roman",serif;
  --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --radius:14px;--max:1120px;
  /* palette: teal (default) */
  --bg:#fbfdfc;--bg2:#eef5f2;--panel:#ffffff;--panel2:#f4f9f7;--border:#d6e3de;
  --text:#12231f;--muted:#4a5f58;--accent:#0f766e;--accent-ink:#ffffff;--accent-soft:#e3f3ef;--link:#0b5f58;--warm:#b45309;
  --shadow:0 1px 2px rgba(18,35,31,.05),0 8px 24px rgba(18,35,31,.06);
}
html[data-palette="forest"]{--bg2:#eff6f0;--border:#d7e5da;--accent:#166534;--accent-soft:#e5f3ea;--link:#14532d;--panel2:#f4f9f5}
html[data-palette="indigo"]{--bg2:#eef2fa;--border:#d8e0f0;--accent:#1d4ed8;--accent-soft:#e6edfc;--link:#1e40af;--panel2:#f4f7fc}
html[data-theme="dark"]{--bg:#0c1513;--bg2:#101c19;--panel:#13201d;--panel2:#162622;--border:#22342f;--text:#e6efec;--muted:#9db2ab;--accent:#2dd4bf;--accent-ink:#042320;--accent-soft:#12302b;--link:#5eead4;--warm:#fbbf24;--shadow:none}
html[data-theme="dark"][data-palette="forest"]{--accent:#4ade80;--accent-ink:#052e16;--accent-soft:#12301f;--link:#86efac;--bg2:#0f1c14}
html[data-theme="dark"][data-palette="indigo"]{--accent:#60a5fa;--accent-ink:#0a1a3a;--accent-soft:#14223f;--link:#93c5fd;--bg2:#0f1626}

*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--sans);line-height:1.65;font-size:17px;overflow-x:hidden}
img,svg{max-width:100%;height:auto}
a{color:var(--link);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:6px}
.skip{position:absolute;left:-999px;top:8px;background:var(--accent);color:var(--accent-ink);padding:10px 16px;border-radius:8px;z-index:100}
.skip:focus{left:8px}
.container{width:100%;max-width:var(--max);margin:0 auto;padding:0 20px}
.section{padding:72px 0}
.section.alt{background:var(--bg2)}
.section.line{border-top:1px solid var(--border)}
.eyebrow{font-family:var(--mono);font-weight:500;font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);margin-bottom:10px}
h1,h2,h3{font-family:var(--serif);font-weight:600;line-height:1.22;margin:0 0 .5em;letter-spacing:-.005em}
h1{font-size:clamp(1.95rem,4.2vw,3rem)}
h2{font-size:clamp(1.5rem,3vw,2.1rem)}
h3{font-size:1.15rem;font-family:var(--sans);font-weight:600}
p{margin:0 0 1em}
.lead{font-size:clamp(1.05rem,1.6vw,1.2rem);color:var(--muted);max-width:62ch}
.muted{color:var(--muted)}
.small{font-size:.9rem}
.mono{font-family:var(--mono);font-weight:500}
.center{text-align:center}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:12px;height:66px}
.brand{display:flex;align-items:center;gap:10px;color:var(--text);font-family:var(--serif);font-weight:600;font-size:1.15rem;text-decoration:none}
.brand svg{width:30px;height:30px;flex:none}
.brand .dot{width:8px;height:8px;border-radius:50%;background:var(--accent);animation:pulse 2.6s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 color-mix(in srgb,var(--accent) 55%,transparent)}70%,100%{box-shadow:0 0 0 8px transparent}}
.nav-links{display:flex;align-items:center;gap:2px;list-style:none;margin:0;padding:0}
.nav-links a{display:block;padding:10px 12px;border-radius:10px;color:var(--text);font-size:.95rem;text-decoration:none}
.nav-links a:hover{background:var(--accent-soft)}
.nav-links a.btn-primary,.nav-links a.btn-primary:hover{color:var(--accent-ink);background:var(--accent)}
.nav-links a[aria-current="page"]{color:var(--accent);font-weight:600}
.nav-right{display:flex;align-items:center;gap:8px}
.icon-btn{background:transparent;border:1px solid var(--border);color:var(--text);border-radius:10px;min-width:44px;height:44px;padding:0 12px;font:inherit;cursor:pointer;display:inline-flex;align-items:center;justify-content:center}
.icon-btn:hover{background:var(--accent-soft)}
.nav-links a.btn-primary,.nav-links a.btn-primary:hover,.nav-links a.btn-primary[aria-current="page"]{color:var(--accent-ink);background:var(--accent);font-weight:600}
.menu-btn{display:none}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:10px 22px;border-radius:12px;font:inherit;font-weight:600;border:1px solid transparent;cursor:pointer;text-decoration:none;transition:transform .15s,box-shadow .15s,background .15s}
.btn:hover{transform:translateY(-1px);text-decoration:none}
.btn-primary{background:var(--accent);color:var(--accent-ink)}
.btn-primary:hover{box-shadow:0 8px 22px color-mix(in srgb,var(--accent) 35%,transparent)}
.btn-ghost{border-color:var(--border);background:var(--panel);color:var(--text)}
.btn-ghost:hover{border-color:var(--accent)}
.btn-sm{min-height:40px;padding:6px 16px}
.btn-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}

/* hero */
.hero{position:relative;overflow:hidden;padding:72px 0 64px;background:radial-gradient(900px 420px at 92% -10%,color-mix(in srgb,var(--accent) 14%,transparent),transparent 65%),linear-gradient(var(--bg),var(--bg2))}
.hero canvas{position:absolute;inset:0;width:100%;height:100%;opacity:.5;pointer-events:none}
.hero-grid{position:relative;display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center}
.badge{display:inline-block;font-family:var(--mono);font-weight:500;font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);border:1px solid color-mix(in srgb,var(--accent) 40%,transparent);background:var(--accent-soft);padding:6px 12px;border-radius:999px;margin-bottom:18px}
.page-hero{padding:60px 0 36px;background:linear-gradient(var(--bg),var(--bg2));border-bottom:1px solid var(--border)}
.figcard{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:14px;box-shadow:var(--shadow)}
.figcard figcaption{font-size:.8rem;color:var(--muted);margin-top:8px;line-height:1.45}
.fig{display:block;width:100%}
.fig .ax{stroke:var(--border);stroke-width:1.2;fill:none}
.fig .t{stroke:color-mix(in srgb,var(--accent) 45%,transparent);stroke-width:1.3;fill:none}
.fig .t.dash{stroke:var(--warm);stroke-dasharray:5 4;stroke-width:1.6}
.fig .c{stroke:var(--accent);stroke-width:2.6;fill:none}
.fig .lb{fill:var(--muted);font-family:var(--mono);font-size:11px}
.fig .q{fill:var(--panel);stroke:var(--muted);stroke-width:1.4}
.fig .c2{fill:var(--accent);stroke:var(--accent)}
.fig .c3{fill:var(--warm);stroke:var(--warm)}
.fig .k{fill:var(--accent-soft);stroke:var(--accent);stroke-width:2}
.fig .k2{fill:color-mix(in srgb,var(--warm) 18%,var(--panel));stroke:var(--warm);stroke-width:2}

/* grids and cards */
.grid{display:grid;gap:20px}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))}
.g3{grid-template-columns:repeat(3,minmax(0,1fr))}
.g4{grid-template-columns:repeat(4,minmax(0,1fr))}
.card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);transition:border-color .2s,transform .2s}
.card:hover{border-color:color-mix(in srgb,var(--accent) 55%,var(--border))}
a.card{display:block;color:inherit;text-decoration:none}
a.card:hover{transform:translateY(-2px)}
.card h3{margin-bottom:.4em}
.card p:last-child{margin-bottom:0}
.tag{display:inline-block;font-family:var(--mono);font-weight:500;font-size:11px;letter-spacing:.03em;padding:3px 10px;border-radius:999px;border:1px solid var(--border);color:var(--muted);background:var(--panel2);margin:0 6px 6px 0}
.tag.cy{border-color:color-mix(in srgb,var(--accent) 45%,transparent);color:var(--accent);background:var(--accent-soft)}
.tag.wm{border-color:color-mix(in srgb,var(--warm) 45%,transparent);color:var(--warm)}

/* proof strip */
.proof{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--border);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.proof>a,.proof>div{background:var(--panel);padding:22px 20px;color:inherit;display:block;text-decoration:none}
.proof>a:hover{background:var(--accent-soft)}
.proof .num{font-family:var(--serif);font-weight:600;font-size:2rem;color:var(--accent);line-height:1.1}
.proof .lbl{font-size:.9rem;color:var(--muted);margin-top:6px}

.check{list-style:none;padding:0;margin:0}
.check li{position:relative;padding-left:28px;margin-bottom:12px}
.check li::before{content:"";position:absolute;left:2px;top:.6em;width:9px;height:9px;border-radius:2px;background:var(--accent);transform:rotate(45deg)}

/* filters, lists */
.filters{display:flex;flex-wrap:wrap;gap:8px;margin:0}
.filters button{background:var(--panel);border:1px solid var(--border);color:var(--text);padding:9px 14px;min-height:40px;border-radius:10px;font:inherit;font-size:.9rem;cursor:pointer}
.filters button:hover{border-color:var(--accent)}
.filters button[aria-pressed="true"]{border-color:var(--accent);color:var(--accent-ink);background:var(--accent)}
.search{width:100%;max-width:320px;background:var(--panel);border:1px solid var(--border);color:var(--text);padding:10px 14px;border-radius:10px;font:inherit;min-height:44px}
.toolbar{display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;align-items:center;margin-bottom:18px}
.paper{display:grid;gap:6px}
.paper h3{margin:0;font-size:1.02rem;line-height:1.4}
.paper .meta{color:var(--muted);font-size:.9rem}
.empty{border:1px dashed var(--border);border-radius:var(--radius);padding:26px;color:var(--muted);background:var(--panel2)}
.bars{display:flex;align-items:flex-end;gap:8px;height:100px;margin:8px 0 34px}
.bars div{flex:1;background:var(--accent);opacity:.85;border-radius:5px 5px 0 0;position:relative;min-width:14px}
.bars span{position:absolute;bottom:-22px;left:50%;transform:translateX(-50%);font-size:11px;color:var(--muted);font-family:var(--mono)}
.bars b{position:absolute;top:-20px;left:50%;transform:translateX(-50%);font-size:11px;font-family:var(--mono);font-weight:500;color:var(--text)}
.proj{display:grid;grid-template-columns:200px 1fr;gap:22px;align-items:start}
.proj .figcard{box-shadow:none;padding:8px}
.proj dl{margin:10px 0 0;display:grid;grid-template-columns:auto 1fr;gap:4px 14px;font-size:.93rem}
.proj dt{font-family:var(--mono);font-weight:500;font-size:.78rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);padding-top:3px}
.proj dd{margin:0}
.person img{width:104px;height:104px;border-radius:50%;object-fit:cover;border:3px solid var(--accent-soft);margin-bottom:12px}
.avatar{width:72px;height:72px;border-radius:50%;background:var(--accent-soft);color:var(--accent);display:flex;align-items:center;justify-content:center;font-family:var(--serif);font-weight:600;font-size:1.5rem;margin-bottom:12px}
details.more{margin-top:14px;border:1px solid var(--border);border-radius:var(--radius);background:var(--panel)}
details.more summary{cursor:pointer;padding:14px 18px;font-weight:600;min-height:44px}
details.more ul{margin:0;padding:0 18px 16px;list-style:none}
details.more li{padding:8px 0;border-top:1px solid var(--border);font-size:.93rem}
.list-plain{list-style:none;margin:0;padding:0}
.list-plain li{padding:10px 0;border-top:1px solid var(--border)}
.list-plain li:first-child{border-top:0}

/* forms */
form .row{display:grid;gap:16px;grid-template-columns:1fr 1fr}
label{display:block;font-size:.9rem;color:var(--text);margin-bottom:6px;font-weight:600}
input,select,textarea{width:100%;background:var(--bg);border:1px solid var(--border);color:var(--text);padding:12px 14px;border-radius:10px;font:inherit;min-height:46px}
textarea{min-height:150px;resize:vertical}
.field{margin-bottom:16px}
.hp{position:absolute;left:-9999px;height:0;overflow:hidden}
.notice{margin-top:14px;padding:12px 14px;border-radius:10px;border:1px solid var(--border);background:var(--panel2);font-size:.95rem}
.notice.ok{border-color:var(--accent)}
.notice.err{border-color:#dc2626}

.ta{font-family:"Noto Sans Tamil",var(--sans);line-height:1.9}
h1.ta,h2.ta,h3.ta{font-family:"Noto Sans Tamil",var(--sans);font-weight:700}

/* footer */
.site-footer{border-top:1px solid var(--border);padding:48px 0 32px;background:var(--bg2);color:var(--muted);font-size:.95rem}
.foot{display:grid;grid-template-columns:2fr 1fr 1fr;gap:32px}
.foot h4{margin:0 0 10px;color:var(--text);font-size:.95rem}
.foot ul{list-style:none;margin:0;padding:0}
.foot li{margin-bottom:6px}
.copy{margin-top:32px;padding-top:20px;border-top:1px solid var(--border);font-size:.85rem}

@media (max-width:980px){
  .hero-grid{grid-template-columns:1fr}
  .hero-fig{max-width:460px}
  .g3,.g4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .proof{grid-template-columns:repeat(2,1fr)}
  .nav-links a{padding:10px 8px;font-size:.9rem}
}
@media (max-width:860px){
  .menu-btn{display:inline-flex}
  .nav-links{display:none;position:absolute;left:0;right:0;top:66px;flex-direction:column;align-items:stretch;gap:0;background:var(--bg);border-bottom:1px solid var(--border);padding:8px 20px 16px;box-shadow:var(--shadow)}
  .nav-links.open{display:flex}
  .nav-links a{padding:14px 10px;font-size:1rem;border-bottom:1px solid var(--border);border-radius:0}
  .nav-links li:last-child a{border:0;margin-top:10px;text-align:center}
}
@media (max-width:680px){
  body{font-size:16px}
  .section{padding:52px 0}
  .hero{padding:44px 0 40px}
  .g2,.g3,.g4,form .row,.foot,.proj{grid-template-columns:1fr}
  .proj .figcard{max-width:320px}
  .card{padding:20px}
  .btn-row .btn{flex:1 1 100%}
  .proof .num{font-size:1.6rem}
  .proof>a,.proof>div{padding:16px 14px}
  .toolbar{flex-direction:column;align-items:stretch}
  .search{max-width:none}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  .hero canvas{display:none}
}
@media print{.site-header,.hero canvas,.menu-btn,.btn-row{display:none}body{background:#fff;color:#000}}