/* ===================================================================
   Nexus Learning Labs — shared design system  (nll.css)
   One stylesheet for every page. Identity preserved, execution elevated.
   Palette: Vedic green · Theme: light "walkable laboratory"
   =================================================================== */

:root{
  /* brand greens */
  --green:#6DBF4A; --mid:#4A9E35; --dark:#2E7D20; --deep:#215C17;
  --tint1:#F0F8EC; --tint2:#E3F2DB; --tint3:#F7FBF4;
  /* ink */
  --charcoal:#2B3038; --slate:#4B5563; --muted:#5D6673;
  --border:rgba(46,125,32,.22); --border-soft:rgba(46,125,32,.12);
  /* accessible link colour (WCAG AA on white ≈ 5.3:1) */
  --link:#2E7D20; --amber:#C77700;
  /* elevation */
  --shadow:0 6px 28px rgba(46,125,32,.10);
  --shadow-hi:0 18px 50px rgba(46,125,32,.20);
  --shadow-sm:0 2px 10px rgba(46,125,32,.08);
  --grad:linear-gradient(120deg,#6DBF4A,#2E7D20);
  --grad-soft:linear-gradient(120deg,#8FD36F,#4A9E35);
  /* type + rhythm */
  --font:'Poppins',system-ui,-apple-system,Segoe UI,sans-serif;
  --mono:ui-monospace,"SF Mono",Menlo,Consolas,monospace;
  --maxw:1140px; --measure:66ch; --radius:18px;
  --room-pad:clamp(64px,9vw,116px);
}

*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  background:#fff;color:var(--charcoal);font-family:var(--font);
  font-weight:400;line-height:1.6;overflow-x:hidden;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
::selection{background:var(--tint2);color:var(--deep);}
img{max-width:100%;}
a{color:var(--link);}

/* focus visibility for keyboard users */
:focus-visible{outline:3px solid rgba(74,158,53,.55);outline-offset:2px;border-radius:6px;}

/* dotted-grid backdrop */
.dot-grid{position:fixed;inset:-60px;z-index:0;pointer-events:none;
  background-image:radial-gradient(circle,rgba(46,125,32,.075) 1px,transparent 1.5px);
  background-size:30px 30px;}

/* skip link */
.skip{position:absolute;left:-999px;top:8px;z-index:200;background:#fff;color:var(--dark);
  border:1px solid var(--border);border-radius:10px;padding:10px 16px;font-weight:600;font-size:13px;}
.skip:focus{left:12px;}

/* ===== NAVBAR ===== */
#nav{position:fixed;top:0;left:0;right:0;z-index:80;display:flex;align-items:center;gap:14px;
  padding:11px 26px;background:rgba(255,255,255,.82);backdrop-filter:blur(18px);
  border-bottom:1px solid var(--border-soft);overflow:hidden;}
#nav::before{content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(300px circle at var(--mx,20%) 50%,rgba(109,191,74,.10),transparent 62%);}
#nav .brand{display:flex;align-items:center;gap:11px;text-decoration:none;position:relative;z-index:1;}
#nav .brand img{height:46px;width:46px;display:block;border-radius:50%;object-fit:cover;object-position:50% 46%;background:radial-gradient(circle at 50% 42%,#1a3d1e 0%,#0d1f10 68%,#0a1a0d 100%);box-shadow:0 3px 12px rgba(13,31,16,.30),0 0 0 1px rgba(46,125,32,.35),inset 0 1px 0 rgba(255,255,255,.05);transition:transform .25s ease,box-shadow .25s ease;}
.brand:hover img{transform:translateY(-1px) scale(1.03);box-shadow:0 5px 18px rgba(13,31,16,.36),0 0 0 1px rgba(46,125,32,.5);}
#nav .brand span{font-size:13px;font-weight:700;color:var(--charcoal);line-height:1.14;letter-spacing:.04em;}
#nav .links{margin-left:auto;display:flex;align-items:center;gap:22px;position:relative;z-index:1;}
#nav .links a{font-size:12.5px;font-weight:500;color:var(--slate);text-decoration:none;
  letter-spacing:.01em;transition:color .2s;}
#nav .links a:hover{color:var(--dark);}
#nav .links a.cta{font-weight:600;color:var(--dark);border:1px solid var(--border);
  padding:6px 15px;border-radius:100px;transition:background .2s,transform .2s;}
#nav .links a.cta:hover{background:var(--tint1);transform:translateY(-1px);}
@media(max-width:880px){#nav .links a:not(.cta){display:none;}}

/* ===== ORBITAL SCROLL-SPY ===== */
#orbital{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:70;
  display:flex;flex-direction:column;align-items:flex-end;}
.orb-link{display:flex;align-items:center;gap:10px;text-decoration:none;padding:6px 0;cursor:pointer;}
.orb-label{font-size:10.5px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--dark);
  background:rgba(255,255,255,.9);backdrop-filter:blur(8px);border:1px solid var(--border);
  border-radius:100px;padding:4px 12px;opacity:0;transform:translateX(8px);transition:.22s;
  pointer-events:none;white-space:nowrap;}
.orb-node{width:10px;height:10px;border-radius:50%;border:2px solid var(--mid);background:#fff;transition:.22s;flex:0 0 auto;}
.orb-link:hover .orb-label{opacity:1;transform:none;}
.orb-link:hover .orb-node{transform:scale(1.35);}
.orb-link.active .orb-node{background:var(--green);animation:orbPing 2s ease-out infinite;}
@keyframes orbPing{0%{box-shadow:0 0 0 0 rgba(109,191,74,.55)}70%{box-shadow:0 0 0 8px rgba(109,191,74,0)}100%{box-shadow:0 0 0 0 rgba(109,191,74,0)}}
.orb-wire{width:2px;height:11px;background:var(--border);margin-right:4px;}
@media(max-width:820px){#orbital{display:none;}}

/* ===== SHARED LAYOUT ===== */
.room{position:relative;z-index:2;padding:var(--room-pad) 24px;max-width:var(--maxw);margin:0 auto;}
.room-tag{font-size:11px;font-weight:600;letter-spacing:.22em;text-transform:uppercase;color:#fff;
  background:var(--grad);display:inline-block;padding:5px 14px;border-radius:100px;margin-bottom:16px;}
.room-title{font-size:clamp(27px,3.7vw,44px);font-weight:700;color:var(--deep);
  margin-bottom:14px;letter-spacing:-.018em;line-height:1.12;}
.room-title em{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;}
.room-sub{font-size:15px;font-weight:400;color:var(--muted);margin-bottom:38px;max-width:var(--measure);line-height:1.7;}
.room-sub a{color:var(--link);font-weight:500;text-decoration:none;border-bottom:1px solid var(--border);}
.room-sub a:hover{border-color:var(--mid);}

.glass{background:rgba(255,255,255,.72);backdrop-filter:blur(14px);border:1px solid var(--border);
  border-radius:var(--radius);box-shadow:var(--shadow);
  transition:transform .35s cubic-bezier(.2,.8,.2,1),box-shadow .35s;}
.glass.lift:hover{transform:translateY(-4px);box-shadow:var(--shadow-hi);}

.prose{font-size:15px;font-weight:400;line-height:1.78;color:var(--slate);max-width:var(--measure);}
.prose + .prose{margin-top:13px;}
.pull{font-size:14.5px;font-weight:500;font-style:italic;color:var(--mid);margin-top:16px;line-height:1.6;}

/* spike divider (EKG trace) */
.spike-divider{display:block;width:100%;height:54px;position:relative;z-index:2;}
.spike-divider path{fill:none;stroke:var(--green);stroke-width:2;stroke-linecap:round;
  stroke-dasharray:1200;stroke-dashoffset:1200;filter:drop-shadow(0 0 5px rgba(109,191,74,.45));}
.spike-divider.fired path{animation:trace 3.2s ease-out forwards;}
@keyframes trace{to{stroke-dashoffset:0}}

/* scroll reveal */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease,transform .7s cubic-bezier(.2,.8,.2,1);}
.reveal.in{opacity:1;transform:none;}

/* buttons */
.btn{font-family:var(--font);font-size:13px;font-weight:600;cursor:pointer;padding:13px 28px;
  border-radius:100px;border:1px solid transparent;text-decoration:none;display:inline-flex;
  align-items:center;gap:8px;transition:transform .22s,box-shadow .22s,background .22s;}
.btn.primary{background:var(--grad);color:#fff;box-shadow:0 8px 22px rgba(46,125,32,.32);}
.btn.primary:hover{transform:translateY(-2px);box-shadow:0 12px 32px rgba(46,125,32,.44);}
.btn.ghost{background:rgba(255,255,255,.7);color:var(--dark);border-color:var(--border);}
.btn.ghost:hover{background:var(--tint1);transform:translateY(-2px);}

/* chips (filters / tags) */
.chip{font-family:var(--font);font-size:12px;font-weight:500;padding:7px 15px;border-radius:100px;
  cursor:pointer;border:1px solid var(--border);background:rgba(255,255,255,.75);color:var(--charcoal);
  transition:all .22s;}
.chip:hover{transform:translateY(-2px);box-shadow:var(--shadow-sm);}
.chip.on{background:var(--grad);color:#fff;border-color:transparent;box-shadow:0 6px 18px rgba(46,125,32,.32);}

@keyframes breathe{0%,100%{opacity:.7}50%{opacity:1}}

/* ===================================================================
   ARCHIVE ROWS  — frontier-grade filterable publication index
   date · title (link) · series tag · one-line summary + DOI
   =================================================================== */
.archive-controls{display:flex;flex-wrap:wrap;gap:14px;align-items:center;margin-bottom:8px;}
.archive-search{flex:1;min-width:240px;position:relative;}
.archive-search input{width:100%;font-family:var(--font);font-size:14px;font-weight:400;
  padding:12px 18px 12px 42px;border:1px solid var(--border);border-radius:100px;outline:none;
  background:rgba(255,255,255,.85);color:var(--charcoal);transition:border-color .2s,box-shadow .2s;}
.archive-search input:focus{border-color:var(--mid);box-shadow:0 0 0 3px rgba(109,191,74,.15);}
.archive-search svg{position:absolute;left:15px;top:50%;transform:translateY(-50%);width:16px;height:16px;stroke:var(--muted);}
.archive-sort{font-family:var(--font);font-size:13px;font-weight:500;color:var(--slate);
  padding:11px 16px;border:1px solid var(--border);border-radius:100px;background:rgba(255,255,255,.85);cursor:pointer;}
.archive-count{font-size:12.5px;font-weight:500;color:var(--muted);margin:22px 0 6px;letter-spacing:.01em;}

.paper-list{border-top:1px solid var(--border-soft);}
.paper-row{display:grid;grid-template-columns:118px 1fr auto;gap:20px;align-items:baseline;
  padding:22px 6px;border-bottom:1px solid var(--border-soft);
  transition:background .2s;position:relative;}
.paper-row:hover{background:linear-gradient(90deg,var(--tint3),transparent);}
.paper-row .pr-date{font-size:12.5px;font-weight:500;color:var(--muted);letter-spacing:.02em;padding-top:3px;}
.paper-row .pr-main{min-width:0;}
.paper-row .pr-title{font-size:16.5px;font-weight:600;color:var(--charcoal);line-height:1.35;
  text-decoration:none;display:inline;transition:color .2s;}
.paper-row .pr-title:hover{color:var(--dark);}
.paper-row .pr-title::after{content:"↗";font-size:12px;color:var(--mid);margin-left:7px;opacity:0;transition:opacity .2s;}
.paper-row:hover .pr-title::after{opacity:1;}
.paper-row .pr-sum{font-size:13.5px;font-weight:400;color:var(--muted);line-height:1.6;margin-top:6px;max-width:72ch;}
.paper-row .pr-meta{display:flex;align-items:center;gap:12px;margin-top:10px;flex-wrap:wrap;}
.paper-row .pr-doi{font-family:var(--mono);font-size:11px;color:var(--slate);text-decoration:none;
  border-bottom:1px dotted var(--border);}
.paper-row .pr-doi:hover{color:var(--dark);border-color:var(--mid);}
.paper-row .pr-tag{font-size:10.5px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;
  color:var(--dark);background:var(--tint2);border-radius:100px;padding:5px 12px;white-space:nowrap;justify-self:end;}
@media(max-width:720px){
  .paper-row{grid-template-columns:1fr;gap:6px;}
  .paper-row .pr-tag{justify-self:start;margin-top:4px;}
  .paper-row .pr-date{padding-top:0;}
}
.archive-more{display:flex;justify-content:center;margin-top:34px;}
.archive-empty{padding:40px 6px;color:var(--muted);font-size:14px;text-align:center;}

/* featured paper card (above the index) */
.featured{padding:30px 32px;display:grid;grid-template-columns:auto 1fr;gap:26px;align-items:center;}
.featured .f-badge{font-size:10.5px;font-weight:700;letter-spacing:.16em;text-transform:uppercase;
  color:#fff;background:var(--grad);border-radius:100px;padding:6px 14px;align-self:start;white-space:nowrap;}
.featured .f-title{font-size:clamp(18px,2.4vw,24px);font-weight:700;color:var(--deep);line-height:1.25;}
.featured .f-sum{font-size:14.5px;color:var(--slate);line-height:1.65;margin:10px 0 16px;max-width:68ch;}
@media(max-width:640px){.featured{grid-template-columns:1fr;gap:14px;}}

/* generic grids reused across pages */
.grid-auto{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:22px;}
.card{padding:26px 24px;}
.card h3{font-size:16.5px;font-weight:600;color:var(--dark);}
.card p{font-size:13.5px;font-weight:400;color:var(--muted);line-height:1.65;margin:9px 0 0;}

/* hero stat tiles */
.hero-stats{display:flex;flex-wrap:wrap;gap:34px;margin-top:30px;}
.hero-stats .hs .v{font-size:clamp(30px,4vw,42px);font-weight:800;color:var(--deep);
  font-variant-numeric:tabular-nums;line-height:1;}
.hero-stats .hs .l{font-size:11px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-top:8px;}

/* callout / disclaimer */
.callout{padding:18px 24px;border-left:5px solid var(--amber);background:var(--tint1);border-radius:12px;}
.callout p{font-size:13px;font-weight:400;line-height:1.7;}
.callout b{color:var(--dark);}

/* ===== FOOTER ===== */
footer{position:relative;z-index:2;text-align:center;padding:56px 24px 50px;
  border-top:1px solid var(--border);background:var(--tint1);}
footer img{height:120px;margin-bottom:10px;filter:drop-shadow(0 8px 24px rgba(46,125,32,.18));}
footer .f-name{font-size:16px;font-weight:700;color:var(--charcoal);letter-spacing:.14em;margin-bottom:12px;}
footer .f-text{color:var(--muted);font-size:12.5px;font-weight:400;line-height:1.85;}
footer .f-text b{color:var(--dark);font-weight:600;}
footer .f-text a{color:var(--link);font-weight:600;text-decoration:none;border-bottom:1px solid var(--border);}
footer .f-text a:hover{border-color:var(--mid);}

/* ===== MAYA — lab guide widget ===== */
#maya-fab{position:fixed;bottom:24px;right:24px;z-index:95;width:62px;height:62px;border-radius:50%;
  border:2px solid #fff;cursor:pointer;background:var(--grad);padding:0;overflow:hidden;
  box-shadow:0 12px 32px rgba(46,125,32,.42);transition:transform .3s;}
#maya-fab img{width:100%;height:100%;object-fit:cover;display:block;}
#maya-fab:hover{transform:scale(1.1);}
#maya-panel{position:fixed;bottom:96px;right:24px;z-index:95;width:min(370px,calc(100vw - 36px));
  height:min(520px,calc(100vh - 130px));display:flex;flex-direction:column;background:rgba(255,255,255,.97);
  backdrop-filter:blur(16px);border:1px solid var(--border);border-radius:22px;box-shadow:var(--shadow-hi);
  opacity:0;transform:translateY(14px) scale(.97);pointer-events:none;transition:opacity .3s,transform .3s;overflow:hidden;}
#maya-panel.open{opacity:1;transform:none;pointer-events:auto;}
.mp-head{display:flex;align-items:center;gap:11px;padding:16px 18px 12px;border-bottom:1px solid var(--border);}
.mp-head img{width:34px;height:34px;border-radius:50%;object-fit:cover;}
.mp-head .mp-name{font-size:14.5px;font-weight:700;color:var(--dark);line-height:1.1;}
.mp-head .mp-role{font-size:9.5px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--mid);}
#mp-log{flex:1;overflow-y:auto;padding:14px 16px;display:flex;flex-direction:column;gap:10px;}
.msg{max-width:86%;padding:10px 14px;border-radius:16px;font-size:12.5px;font-weight:400;line-height:1.55;}
.msg.maya{align-self:flex-start;background:var(--tint1);border:1px solid var(--border);border-bottom-left-radius:4px;}
.msg.user{align-self:flex-end;background:var(--grad);color:#fff;border-bottom-right-radius:4px;}
.msg .m-doi{display:inline-block;margin-top:8px;font-size:11px;font-weight:600;color:var(--dark);
  text-decoration:none;border-bottom:1px solid var(--border);}
.msg .m-act{display:inline-block;margin-top:8px;margin-right:8px;font-family:var(--font);font-size:10.5px;
  font-weight:600;color:var(--dark);background:#fff;border:1px solid var(--border);border-radius:100px;padding:5px 12px;cursor:pointer;}
.msg .m-act:hover{background:var(--tint2);}
.mp-chips{display:flex;flex-wrap:wrap;gap:7px;padding:0 16px 10px;}
.mp-chip{font-family:var(--font);font-size:10.5px;font-weight:500;padding:6px 12px;border-radius:100px;
  border:1px solid var(--border);background:#fff;color:var(--dark);cursor:pointer;transition:.22s;}
.mp-chip:hover{background:var(--tint1);transform:translateY(-1px);}
.mp-input{display:flex;gap:8px;padding:12px 14px;border-top:1px solid var(--border);}
.mp-input input{flex:1;font-family:var(--font);font-size:12.5px;padding:11px 16px;border:1px solid var(--border);
  border-radius:100px;outline:none;background:#fff;color:var(--charcoal);}
.mp-input input:focus{border-color:var(--mid);box-shadow:0 0 0 3px rgba(109,191,74,.15);}
.mp-input button{width:42px;height:42px;border-radius:50%;border:none;background:var(--grad);color:#fff;
  font-size:15px;cursor:pointer;transition:transform .22s;flex:0 0 auto;}
.mp-input button:hover{transform:scale(1.08);}

/* reduced motion */
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important;}
  .reveal{opacity:1;transform:none;}
  .spike-divider path{stroke-dashoffset:0;}
  html{scroll-behavior:auto;}
}