/* ==========================================================================
   Pentarch SimLab — design system
   Dark "lab bench" aesthetic: blueprint grid, glass panels, department accents
   ========================================================================== */
:root{
  --bg:#070b16; --bg2:#0b1222; --panel:#0f1729; --panel2:#131d33; --line:#1e2a44; --line2:#2a3a5c;
  --text:#e6ecf7; --muted:#93a1bd; --dim:#5f6d8a;
  --brand:#7c5cff; --brand2:#22d3ee;
  --eng:#f5a524; --phy:#22d3ee; --bio:#34d399; --chem:#a3e635; --comp:#60a5fa;
  --med:#f472b6; --ops:#fb7185; --earth:#2dd4bf; --biz:#facc15; --health:#f87171;
  --accent:var(--brand);
  --ok:#22c55e; --warn:#f59e0b; --bad:#ef4444;
  --r:14px; --r-sm:9px;
  --shadow:0 10px 40px -12px rgba(0,0,0,.6);
  --font:'Inter',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  --display:'Space Grotesk','Inter',sans-serif;
  --mono:'JetBrains Mono',ui-monospace,Menlo,Consolas,monospace;
  --hdr:68px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);font-size:15.5px;line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:
   radial-gradient(1200px 600px at 85% -10%,rgba(124,92,255,.14),transparent 60%),
   radial-gradient(900px 500px at -10% 20%,rgba(34,211,238,.08),transparent 60%),
   linear-gradient(rgba(255,255,255,.025) 1px,transparent 1px) 0 0/40px 40px,
   linear-gradient(90deg,rgba(255,255,255,.025) 1px,transparent 1px) 0 0/40px 40px;}
a{color:var(--brand2);text-decoration:none}
a:hover{text-decoration:underline}
img,svg,canvas{max-width:100%}
h1,h2,h3,h4{font-family:var(--display);line-height:1.15;margin:0 0 .5em;letter-spacing:-.01em}
h1{font-size:clamp(2rem,4.5vw,3.4rem)} h2{font-size:clamp(1.5rem,3vw,2.2rem)} h3{font-size:1.25rem} h4{font-size:1.05rem}
p{margin:0 0 1em}
code,kbd,.mono{font-family:var(--mono);font-size:.9em}
code{background:rgba(255,255,255,.06);padding:.1em .4em;border-radius:5px}
kbd{background:var(--panel2);border:1px solid var(--line2);border-bottom-width:2px;border-radius:5px;padding:.05em .45em}
.container{width:min(1280px,100% - 32px);margin-inline:auto}
.wide{width:min(1500px,100% - 32px);margin-inline:auto}
.muted{color:var(--muted)} .dim{color:var(--dim)} .small{font-size:.85rem}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

/* department theming: put data-dept on body or any element */
[data-dept=engineering]{--accent:var(--eng)} [data-dept=physics]{--accent:var(--phy)}
[data-dept=life]{--accent:var(--bio)} [data-dept=chemistry]{--accent:var(--chem)}
[data-dept=computing]{--accent:var(--comp)} [data-dept=media]{--accent:var(--med)}
[data-dept=operations]{--accent:var(--ops)} [data-dept=earth]{--accent:var(--earth)}
[data-dept=business]{--accent:var(--biz)} [data-dept=health]{--accent:var(--health)}

/* ---------------- Header / mega menu ---------------- */
.sl-header{position:sticky;top:0;z-index:100;height:var(--hdr);backdrop-filter:blur(14px) saturate(140%);background:rgba(7,11,22,.78);border-bottom:1px solid var(--line)}
.sl-header .bar{display:flex;align-items:center;gap:18px;height:100%}
.sl-logo{display:flex;align-items:center;gap:10px;color:var(--text);font-family:var(--display);font-weight:700;font-size:1.15rem;white-space:nowrap}
.sl-logo:hover{text-decoration:none}
.sl-logo .mark{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;background:conic-gradient(from 210deg,#7c5cff,#22d3ee,#34d399,#f5a524,#f472b6,#7c5cff);box-shadow:0 0 24px -4px rgba(124,92,255,.7)}
.sl-logo .mark svg{width:20px;height:20px}
.sl-logo small{display:block;font:500 .66rem var(--mono);color:var(--muted);letter-spacing:.14em;text-transform:uppercase;margin-top:-2px}
.sl-nav{display:flex;align-items:center;gap:2px;margin-left:auto}
.sl-nav>.item{position:static}
.sl-nav>.item>button,.sl-nav>.item>a{all:unset;cursor:pointer;display:flex;align-items:center;gap:6px;padding:9px 12px;border-radius:10px;color:var(--muted);font-weight:500;font-size:.92rem;transition:.2s}
.sl-nav>.item:hover>button,.sl-nav>.item:hover>a,.sl-nav>.item.open>button{color:var(--text);background:rgba(255,255,255,.05)}
.sl-nav .chev{width:14px;height:14px;transition:transform .25s}
.sl-nav>.item:hover .chev{transform:rotate(180deg)}
.mega{position:absolute;left:0;right:0;top:calc(var(--hdr) - 1px);background:rgba(10,15,29,.97);border-bottom:1px solid var(--line);box-shadow:var(--shadow);opacity:0;visibility:hidden;transform:translateY(-8px);transition:.22s ease;backdrop-filter:blur(16px)}
.sl-nav>.item:hover>.mega,.sl-nav>.item.open>.mega,.sl-nav>.item:focus-within>.mega{opacity:1;visibility:visible;transform:none}
.mega-inner{display:grid;grid-template-columns:260px 1fr;gap:28px;padding:26px 0 30px}
.mega-intro{border-right:1px solid var(--line);padding-right:24px}
.mega-intro h4{font-size:1.3rem;margin-bottom:.35em}
.mega-intro p{color:var(--muted);font-size:.9rem}
.mega-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:6px}
.mega-depts{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:18px 22px}
.mega-depts h5{font:600 .72rem var(--mono);text-transform:uppercase;letter-spacing:.14em;color:var(--accent);margin:0 0 6px;display:flex;align-items:center;gap:7px}
.mega-depts h5 svg{width:15px;height:15px}
.mega-depts a{display:block;color:var(--muted);font-size:.88rem;padding:3px 0}
.mega-depts a:hover{color:var(--text);text-decoration:none;transform:translateX(3px)}
.mlink{display:flex;gap:12px;align-items:flex-start;padding:10px 12px;border-radius:11px;color:var(--text);transition:.18s;border:1px solid transparent}
.mlink:hover{background:rgba(255,255,255,.04);border-color:var(--line);text-decoration:none;transform:translateY(-1px)}
.mlink .ic{flex:none;width:36px;height:36px;border-radius:10px;display:grid;place-items:center;background:color-mix(in srgb,var(--accent) 14%,transparent);color:var(--accent)}
.mlink .ic svg{width:19px;height:19px}
.mlink b{display:block;font-size:.92rem;font-weight:600}
.mlink span{display:block;font-size:.8rem;color:var(--muted);line-height:1.35}
.sl-cta{all:unset;cursor:pointer;padding:9px 16px;border-radius:10px;background:linear-gradient(135deg,#7c5cff,#22d3ee);color:#fff;font-weight:600;font-size:.88rem;white-space:nowrap}
.sl-burger{all:unset;display:none;cursor:pointer;margin-left:auto;padding:8px;border-radius:9px}
.sl-burger svg{width:24px;height:24px}
.sl-search{all:unset;cursor:pointer;display:flex;align-items:center;gap:8px;padding:8px 12px;border:1px solid var(--line);border-radius:10px;color:var(--dim);font-size:.85rem}
.sl-search svg{width:16px;height:16px}
.sl-search:hover{color:var(--text);border-color:var(--line2)}
@media (max-width:1080px){
  .sl-nav,.sl-search,.sl-cta{display:none}
  .sl-burger{display:block}
  .sl-header.mobile-open .sl-nav{display:flex;position:fixed;inset:var(--hdr) 0 0 0;flex-direction:column;align-items:stretch;gap:0;background:var(--bg);overflow:auto;padding:12px 16px 40px}
  .sl-header.mobile-open .sl-nav>.item>button,.sl-header.mobile-open .sl-nav>.item>a{padding:14px 8px;border-bottom:1px solid var(--line);border-radius:0;justify-content:space-between}
  .mega{position:static;opacity:1;visibility:visible;transform:none;display:none;box-shadow:none;border:0;background:transparent}
  .sl-nav>.item.open>.mega{display:block}
  .sl-nav>.item:hover>.mega{display:none}.sl-nav>.item.open:hover>.mega{display:block}
  .mega-inner{grid-template-columns:1fr;padding:10px 0}
  .mega-intro{display:none}
}

/* ---------------- Search palette ---------------- */
.palette{position:fixed;inset:0;z-index:300;background:rgba(3,6,14,.7);backdrop-filter:blur(6px);display:none;align-items:flex-start;justify-content:center;padding:12vh 16px}
.palette.show{display:flex}
.palette .box{width:min(640px,100%);background:var(--panel);border:1px solid var(--line2);border-radius:16px;box-shadow:var(--shadow);overflow:hidden}
.palette input{all:unset;box-sizing:border-box;width:100%;padding:18px 20px;font-size:1.05rem;border-bottom:1px solid var(--line)}
.palette ul{list-style:none;margin:0;padding:8px;max-height:50vh;overflow:auto}
.palette li a{display:flex;gap:12px;align-items:center;padding:10px 12px;border-radius:10px;color:var(--text)}
.palette li a:hover,.palette li.sel a{background:rgba(255,255,255,.06);text-decoration:none}
.palette li .ic{width:30px;height:30px;border-radius:8px;display:grid;place-items:center;background:color-mix(in srgb,var(--accent) 15%,transparent);color:var(--accent)}
.palette li .ic svg{width:16px;height:16px}

/* ---------------- Page hero (module pages) ---------------- */
.page-hero{position:relative;padding:38px 0 26px;border-bottom:1px solid var(--line);overflow:hidden}
.page-hero::after{content:"";position:absolute;right:-120px;top:-160px;width:520px;height:520px;border-radius:50%;background:radial-gradient(closest-side,color-mix(in srgb,var(--accent) 22%,transparent),transparent);pointer-events:none}
.crumbs{font:500 .75rem var(--mono);color:var(--dim);letter-spacing:.06em;text-transform:uppercase;margin-bottom:10px}
.crumbs a{color:var(--muted)}
.page-hero .tag{display:inline-flex;align-items:center;gap:7px;font:600 .72rem var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--accent);background:color-mix(in srgb,var(--accent) 12%,transparent);border:1px solid color-mix(in srgb,var(--accent) 35%,transparent);padding:5px 10px;border-radius:99px;margin-bottom:12px}
.page-hero .tag svg{width:14px;height:14px}
.page-hero h1{font-size:clamp(1.8rem,3.6vw,2.8rem);margin-bottom:.3em}
.page-hero .lead{color:var(--muted);max-width:780px;font-size:1.05rem;margin:0}
.page-hero .meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.chip{display:inline-flex;align-items:center;gap:6px;font-size:.78rem;color:var(--muted);background:var(--panel);border:1px solid var(--line);padding:4px 10px;border-radius:99px}
.chip svg{width:13px;height:13px}

/* ---------------- Lab layout ---------------- */
.lab{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:18px;padding:22px 0}
.lab.wide-controls{grid-template-columns:minmax(0,1fr) 400px}
.lab.full{grid-template-columns:1fr}
@media (max-width:980px){.lab,.lab.wide-controls{grid-template-columns:1fr}}
.stage{position:relative;background:#050913;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;min-height:420px;box-shadow:var(--shadow)}
.stage canvas{display:block;width:100%;height:100%}
.stage .hud{position:absolute;left:12px;top:12px;display:flex;flex-wrap:wrap;gap:6px;pointer-events:none;max-width:calc(100% - 24px)}
.stage .hud .readout{pointer-events:auto}
.stage .hud-r{left:auto;right:12px;justify-content:flex-end}
.stage .hud-b{top:auto;bottom:12px}
.stage-toolbar{position:absolute;right:12px;bottom:12px;display:flex;gap:6px}
.readout{font:500 .78rem var(--mono);background:rgba(5,9,19,.78);border:1px solid var(--line2);padding:5px 9px;border-radius:8px;color:var(--text);backdrop-filter:blur(6px)}
.readout b{color:var(--accent);font-weight:600}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:16px}
.panel+.panel{margin-top:14px}
.panel h3{font-size:1rem;display:flex;align-items:center;gap:8px;margin-bottom:12px}
.panel h3 svg{width:17px;height:17px;color:var(--accent)}
.panel-title{font:600 .7rem var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--dim);margin:14px 0 8px}
.controls{display:flex;flex-direction:column;gap:4px}

/* ---------------- Form controls ---------------- */
.ctl{display:grid;grid-template-columns:1fr auto;align-items:center;gap:2px 10px;padding:6px 0}
.ctl label{font-size:.86rem;color:var(--muted)}
.ctl output,.ctl .val{font:600 .82rem var(--mono);color:var(--text);min-width:60px;text-align:right}
.ctl input[type=range]{grid-column:1/-1}
input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:22px;background:transparent;cursor:pointer}
input[type=range]::-webkit-slider-runnable-track{height:5px;border-radius:5px;background:linear-gradient(90deg,var(--accent) var(--p,50%),var(--line2) var(--p,50%))}
input[type=range]::-moz-range-track{height:5px;border-radius:5px;background:var(--line2)}
input[type=range]::-moz-range-progress{height:5px;border-radius:5px;background:var(--accent)}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:16px;height:16px;border-radius:50%;background:#fff;margin-top:-5.5px;box-shadow:0 0 0 4px color-mix(in srgb,var(--accent) 35%,transparent)}
input[type=range]::-moz-range-thumb{width:16px;height:16px;border:0;border-radius:50%;background:#fff;box-shadow:0 0 0 4px color-mix(in srgb,var(--accent) 35%,transparent)}
select,input[type=number],input[type=text],textarea{background:var(--bg2);color:var(--text);border:1px solid var(--line2);border-radius:9px;padding:8px 10px;font:inherit;font-size:.9rem;width:100%}
select:focus,input:focus,textarea:focus{outline:2px solid color-mix(in srgb,var(--accent) 55%,transparent);outline-offset:1px}
.btn{all:unset;box-sizing:border-box;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:9px 15px;border-radius:10px;font-weight:600;font-size:.88rem;background:var(--panel2);border:1px solid var(--line2);color:var(--text);transition:.15s;user-select:none;text-align:center}
.btn:hover{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 10%,var(--panel2))}
.btn:active{transform:translateY(1px)}
.btn svg{width:16px;height:16px}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#06101f}
.btn.primary:hover{filter:brightness(1.1)}
.btn.ghost{background:transparent}
.btn.danger{background:var(--bad);border-color:var(--bad);color:#fff}
.btn.sm{padding:6px 10px;font-size:.8rem;border-radius:8px}
.btn.on,.btn[aria-pressed=true]{background:color-mix(in srgb,var(--accent) 22%,var(--panel2));border-color:var(--accent);color:#fff}
.btn:disabled,.btn.disabled{opacity:.45;pointer-events:none}
.btn-row{display:flex;flex-wrap:wrap;gap:8px}
.seg{display:inline-flex;background:var(--bg2);border:1px solid var(--line2);border-radius:10px;padding:3px;gap:2px;flex-wrap:wrap}
.seg button{all:unset;cursor:pointer;padding:6px 11px;border-radius:7px;font-size:.82rem;color:var(--muted)}
.seg button.on{background:var(--accent);color:#06101f;font-weight:600}
.toggle{display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:.86rem;color:var(--muted);padding:6px 0;cursor:pointer}
.toggle input{appearance:none;width:36px;height:20px;border-radius:20px;background:var(--line2);position:relative;cursor:pointer;transition:.2s;flex:none}
.toggle input::after{content:"";position:absolute;top:3px;left:3px;width:14px;height:14px;border-radius:50%;background:#fff;transition:.2s}
.toggle input:checked{background:var(--accent)}
.toggle input:checked::after{left:19px}

/* ---------------- Stats / data ---------------- */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:8px}
.stat{background:var(--bg2);border:1px solid var(--line);border-radius:10px;padding:10px 12px}
.stat .k{font:500 .68rem var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--dim)}
.stat .v{font:600 1.15rem var(--mono);color:var(--text)}
.stat .v small{font-size:.7rem;color:var(--muted);margin-left:3px}
table.data{width:100%;border-collapse:collapse;font-size:.86rem}
table.data th,table.data td{padding:7px 10px;border-bottom:1px solid var(--line);text-align:left}
table.data th{font:600 .7rem var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--dim)}
table.data td.num{font-family:var(--mono);text-align:right}
.matrix{display:inline-grid;gap:2px 14px;font:500 .82rem var(--mono);padding:6px 12px;border-left:2px solid var(--muted);border-right:2px solid var(--muted);border-radius:6px;position:relative}
.matrix span{text-align:right}

/* ---------------- Tabs & learning content ---------------- */
.tabs{margin:8px 0 40px}
.tablist{display:flex;gap:4px;border-bottom:1px solid var(--line);overflow-x:auto;scrollbar-width:none}
.tablist button{all:unset;cursor:pointer;display:flex;align-items:center;gap:7px;padding:12px 16px;font-weight:600;font-size:.9rem;color:var(--muted);border-bottom:2px solid transparent;white-space:nowrap}
.tablist button svg{width:16px;height:16px}
.tablist button.on{color:var(--text);border-color:var(--accent)}
.tabpanel{display:none;padding:22px 0;animation:fadeUp .35s ease}
.tabpanel.on{display:block}
.prose{max-width:860px}
.prose h3{margin-top:1.4em}
.prose ul,.prose ol{padding-left:1.3em}
.prose li{margin:.3em 0}
.eq{background:var(--panel);border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:10px;padding:12px 16px;margin:12px 0;overflow-x:auto}
.callout{display:flex;gap:12px;background:color-mix(in srgb,var(--accent) 8%,var(--panel));border:1px solid color-mix(in srgb,var(--accent) 30%,transparent);border-radius:12px;padding:14px 16px;margin:14px 0}
.callout svg{flex:none;width:20px;height:20px;color:var(--accent);margin-top:2px}
.callout.warn{--accent:var(--warn)} .callout.bad{--accent:var(--bad)} .callout.ok{--accent:var(--ok)}
.grid2{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:16px}
.grid3{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px}
.steps{counter-reset:s;list-style:none;padding:0}
.steps li{counter-increment:s;position:relative;padding:10px 0 10px 44px;border-bottom:1px dashed var(--line)}
.steps li::before{content:counter(s);position:absolute;left:0;top:10px;width:28px;height:28px;border-radius:8px;display:grid;place-items:center;background:color-mix(in srgb,var(--accent) 18%,transparent);color:var(--accent);font:600 .8rem var(--mono)}
.worked{background:var(--bg2);border:1px dashed var(--line2);border-radius:12px;padding:14px 16px;font-size:.92rem}

/* ---------------- Quiz ---------------- */
.quiz{max-width:760px}
.quiz .q{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:16px;margin-bottom:12px}
.quiz .q p{font-weight:600;margin-bottom:10px}
.quiz .opts{display:grid;gap:6px}
.quiz .opt{all:unset;cursor:pointer;padding:9px 12px;border:1px solid var(--line2);border-radius:9px;font-size:.9rem;transition:.15s}
.quiz .opt:hover{border-color:var(--accent)}
.quiz .opt.right{border-color:var(--ok);background:rgba(34,197,94,.12)}
.quiz .opt.wrong{border-color:var(--bad);background:rgba(239,68,68,.12)}
.quiz .why{display:none;margin-top:10px;font-size:.86rem;color:var(--muted)}
.quiz .q.done .why{display:block}
.quiz .score{font:600 .9rem var(--mono);color:var(--accent)}

/* ---------------- Toasts, alarms, modal ---------------- */
.toasts{position:fixed;right:16px;bottom:16px;z-index:400;display:flex;flex-direction:column;gap:8px;max-width:min(380px,calc(100% - 32px))}
.toast{background:var(--panel2);border:1px solid var(--line2);border-left:3px solid var(--accent);border-radius:10px;padding:11px 14px;font-size:.88rem;box-shadow:var(--shadow);animation:slideIn .3s ease}
.toast.ok{border-left-color:var(--ok)} .toast.warn{border-left-color:var(--warn)} .toast.bad{border-left-color:var(--bad)}
.modal{position:fixed;inset:0;z-index:350;background:rgba(3,6,14,.72);backdrop-filter:blur(5px);display:none;align-items:center;justify-content:center;padding:16px}
.modal.show{display:flex}
.modal .box{background:var(--panel);border:1px solid var(--line2);border-radius:16px;max-width:620px;width:100%;max-height:85vh;overflow:auto;padding:22px;box-shadow:var(--shadow);animation:fadeUp .25s ease}
.led{display:inline-block;width:10px;height:10px;border-radius:50%;background:var(--dim);box-shadow:inset 0 -2px 3px rgba(0,0,0,.4)}
.led.on{background:var(--ok);box-shadow:0 0 10px var(--ok)}
.led.warn{background:var(--warn);box-shadow:0 0 10px var(--warn)}
.led.bad{background:var(--bad);box-shadow:0 0 12px var(--bad);animation:blink 1s infinite}

/* ---------------- Cards (home / listings) ---------------- */
.card{position:relative;display:flex;flex-direction:column;background:linear-gradient(180deg,var(--panel),var(--bg2));border:1px solid var(--line);border-radius:16px;padding:18px;color:var(--text);transition:.25s;overflow:hidden}
.card:hover{transform:translateY(-4px);border-color:color-mix(in srgb,var(--accent) 55%,transparent);box-shadow:0 18px 40px -18px color-mix(in srgb,var(--accent) 50%,transparent);text-decoration:none}
.card .ic{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;background:color-mix(in srgb,var(--accent) 15%,transparent);color:var(--accent);margin-bottom:14px}
.card .ic svg{width:22px;height:22px}
.card h3{font-size:1.08rem;margin-bottom:.35em}
.card p{color:var(--muted);font-size:.88rem;margin:0}
.card .go{margin-top:auto;padding-top:14px;font:600 .78rem var(--mono);color:var(--accent);display:flex;align-items:center;gap:6px;letter-spacing:.05em;text-transform:uppercase}
.card .go svg{width:14px;height:14px;transition:.2s}
.card:hover .go svg{transform:translateX(4px)}
.card .badge{position:absolute;top:14px;right:14px;font:600 .62rem var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--dim)}

/* ---------------- Footer ---------------- */
.sl-footer{border-top:1px solid var(--line);margin-top:60px;padding:46px 0 26px;background:rgba(5,8,17,.6)}
.sl-footer .cols{display:grid;grid-template-columns:1.4fr repeat(4,1fr);gap:28px}
.sl-footer h5{font:600 .72rem var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--dim);margin:0 0 12px}
.sl-footer a{display:block;color:var(--muted);font-size:.88rem;padding:3px 0}
.sl-footer a:hover{color:var(--text)}
.sl-footer .base{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;border-top:1px solid var(--line);margin-top:34px;padding-top:18px;color:var(--dim);font-size:.82rem}
@media (max-width:860px){.sl-footer .cols{grid-template-columns:1fr 1fr}}

/* ---------------- Animations ---------------- */
@keyframes fadeUp{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
@keyframes slideIn{from{opacity:0;transform:translateX(20px)}to{opacity:1;transform:none}}
@keyframes blink{50%{opacity:.35}}
@keyframes spin{to{transform:rotate(360deg)}}
@keyframes float{50%{transform:translateY(-8px)}}
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}.reveal{opacity:1;transform:none}}
::-webkit-scrollbar{width:10px;height:10px}::-webkit-scrollbar-thumb{background:var(--line2);border-radius:10px}::-webkit-scrollbar-track{background:transparent}
.katex{font-size:1.05em!important}