/* KernelAscent — refined black & white (Lora) */
@import url('https://fonts.googleapis.com/css2?family=Lora:ital,wght@0,400;0,500;0,600;0,700;1,400;1,500;1,600&family=JetBrains+Mono:wght@400;500&display=swap');

:root{
  /* matches ahmd-mohsin.github.io: white + Stanford cardinal accent, Lora, neutral grey surfaces, sharp corners */
  --ink:#262626; --sub:#4b5563; --mid:#9a9a9a; --hair:#d4d4d8; --paper:#ffffff; --wash:#f4f4f5;
  --cardinal:#8C1515; --cardinal-dark:#6f1010; --cardinal-bright:#B1040E; --cardinal-wash:#f7ecec;
  --serif:"Lora",Georgia,serif; --mono:"JetBrains Mono",ui-monospace,Menlo,monospace;
  --measure:70ch;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--serif);
  font-size:15.5px;line-height:1.65;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
::selection{background:var(--ink);color:var(--paper)}
a{color:inherit;text-decoration:underline;text-decoration-color:#cfcfcf;text-underline-offset:2px;text-decoration-thickness:1px}
a:hover{text-decoration-color:var(--ink)}

/* top bar */
.nav{position:sticky;top:0;z-index:50;max-width:none;margin:0;padding:16px 24px;display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap;
  background:rgba(255,255,255,.72);backdrop-filter:saturate(1.4) blur(10px);-webkit-backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid transparent;transition:border-color .3s,box-shadow .3s}
.nav.scrolled{border-bottom-color:var(--hair);box-shadow:0 1px 14px rgba(0,0,0,.04)}
.nav>*{max-width:var(--measure)}
.brand{font-weight:600;font-size:17px;letter-spacing:-.01em}
.brand a{display:inline-flex;align-items:center;gap:10px}
.brand a,.nav nav a{text-decoration:none}
.logo{height:26px;width:auto;object-fit:contain;display:block;transition:transform .5s cubic-bezier(.2,.8,.2,1)}
.brand a:hover .logo{transform:rotate(180deg)}
.nav nav{display:flex;gap:18px;flex-wrap:wrap}
.nav nav a{font-size:13px;color:var(--sub);position:relative;transition:color .2s}
.nav nav a::after{content:"";position:absolute;left:0;bottom:-3px;width:0;height:1px;background:var(--ink);transition:width .25s ease}
.nav nav a:hover{color:var(--ink)}
.nav nav a:hover::after{width:100%}

.wrap{max-width:var(--measure);margin:0 auto;padding:0 24px 90px}

/* hero */
.hero{padding:52px 0 16px}
.eyebrow{font-family:var(--mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--mid)}
h1{font-weight:600;font-size:38px;line-height:1.1;letter-spacing:-.028em;margin:14px 0 16px}
h1 em{font-style:italic;font-weight:500}
.dek{font-size:17px;line-height:1.5;color:#252525;margin:0}
.dek b{font-weight:600}

/* section rhythm with numeral markers */
section{padding:40px 0;border-top:1px solid var(--hair)}
.snum{font-family:var(--mono);font-size:11px;color:var(--mid);letter-spacing:.14em;text-transform:uppercase}
h2{font-weight:600;font-size:24px;letter-spacing:-.02em;margin:6px 0 12px;line-height:1.2}
h3{font-weight:600;font-size:16.5px;letter-spacing:-.01em;margin:24px 0 6px}
p{margin:12px 0}
.sub{color:var(--sub)} .small{font-size:13.5px} .tiny{font-size:12px;color:var(--mid)} .mid{color:var(--mid)}
ul{padding-left:18px} li{margin:5px 0}
strong,b{font-weight:600}

/* figures */
figure{margin:30px 0;text-align:center}
figure svg{width:100%;height:auto;max-width:780px}
figcaption{font-size:13px;color:var(--sub);line-height:1.55;margin:12px auto 0;max-width:60ch;text-align:left}
.fnum{color:var(--ink);font-weight:600}
.note{font-size:13.5px;color:#333;background:var(--wash);border:1px solid var(--hair);border-left:2px solid var(--ink);padding:12px 16px;margin:16px auto;max-width:64ch;border-radius:0 6px 6px 0}

/* two-task layout */
.tracks{display:grid;grid-template-columns:1fr 1fr;gap:34px;margin-top:18px}
@media(max-width:760px){.tracks{grid-template-columns:1fr;gap:28px}}
.track{border:1px solid var(--hair);border-radius:10px;padding:20px 22px;background:var(--wash)}
.track h3{margin-top:0;font-size:18px;display:flex;align-items:baseline;gap:10px}
.track .lab{font-family:var(--mono);font-size:10px;letter-spacing:.12em;text-transform:uppercase;color:var(--mid)}
.track p{font-size:14px;line-height:1.55}
.metrics{font-family:var(--mono);font-size:11.5px;color:var(--sub);margin:8px 0}

/* tables / leaderboards */
.tablewrap{overflow-x:auto;margin:16px 0;border:1px solid var(--hair);border-radius:10px}
table{border-collapse:collapse;width:100%;font-size:13.5px;font-variant-numeric:tabular-nums}
th,td{padding:9px 13px;text-align:left;border-bottom:1px solid var(--hair);white-space:nowrap}
thead th{background:#fbfbfb;border-bottom:1.5px solid var(--ink);font-weight:600;cursor:pointer;position:sticky;top:0}
th.num,td.num{text-align:right}
tbody tr:last-child td{border-bottom:none}
tbody tr:hover{background:var(--wash)}
td.best{font-weight:700}
.pos{color:#166534;font-weight:600} .neg{color:#9a9a9a}
td .mono,.mono{font-family:var(--mono);font-size:.92em}

/* verdict pills */
.pill{display:inline-block;font-family:var(--mono);font-size:10.5px;letter-spacing:.02em;padding:2px 8px;border-radius:20px;border:1px solid var(--hair)}
.pill.good{background:var(--ink);color:#fff;border-color:var(--ink)}
.pill.gain{background:#fff;color:var(--ink);border-color:var(--ink)}
.pill.flat{background:#f2f2f2;color:var(--sub)}
.pill.bad{background:#fff;color:var(--sub);border-color:#d8d8d8;text-decoration:line-through}
.pill.kind{background:#fff;color:var(--sub)}

/* code / submit */
pre{font-family:var(--mono);font-size:12px;line-height:1.6;background:var(--ink);color:#f4f4f4;
  padding:14px 16px;border-radius:9px;overflow-x:auto;margin:12px 0}
code{font-family:var(--mono);font-size:.85em;background:var(--wash);padding:1px 5px;border-radius:4px}
pre code{background:none;padding:0;color:inherit;font-size:12px}
.cmdlabel{font-family:var(--mono);font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--mid);margin-top:14px}

/* kpi row */
.kpis{display:flex;gap:26px;flex-wrap:wrap;padding:16px 0;border-top:1px solid var(--hair);border-bottom:1px solid var(--hair);margin:22px 0 0}
.kpi-n{font-size:21px;font-weight:600;letter-spacing:-.02em}
.kpi-l{font-size:11.5px;color:var(--sub)}

footer{max-width:var(--measure);margin:0 auto;padding:26px 24px 60px;border-top:1px solid var(--hair);color:var(--mid);font-size:12.5px;line-height:1.55}
@media(max-width:640px){body{font-size:15px}h1{font-size:30px}.dek{font-size:16px}h2{font-size:21px}}

/* scroll reveal */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .7s cubic-bezier(.2,.8,.2,1),transform .7s cubic-bezier(.2,.8,.2,1)}
.reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}.logo,.nav nav a::after{transition:none}}

/* hero flourish */
.hero h1{background:linear-gradient(100deg,#151515 0%,#151515 55%,#6b6b6b 100%);-webkit-background-clip:text;background-clip:text}
.eyebrow{position:relative;display:inline-block}
.eyebrow::before{content:"";display:inline-block;width:22px;height:1px;background:var(--mid);vertical-align:middle;margin-right:10px}
.kpi-n{background:linear-gradient(180deg,#151515,#3a3a3a);-webkit-background-clip:text;background-clip:text;color:transparent}

/* card + row hover polish */
.track{transition:transform .3s cubic-bezier(.2,.8,.2,1),box-shadow .3s,border-color .3s}
.track:hover{transform:translateY(-3px);box-shadow:0 8px 30px rgba(0,0,0,.06);border-color:#dcdcdc}
.pill{transition:transform .2s}
tbody tr{transition:background .15s}
.tablewrap{transition:box-shadow .3s}
.tablewrap:hover{box-shadow:0 6px 24px rgba(0,0,0,.05)}
figure svg{transition:filter .3s}

/* dynamic bar charts */
.chart{margin:18px 0 6px}
.chart .row{display:grid;grid-template-columns:170px 1fr 62px;align-items:center;gap:12px;padding:3px 0;font-size:12.5px}
.chart .row .lab{color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;text-align:right}
.chart .row .track2{position:relative;height:16px;background:#f4f4f2;border-radius:4px;overflow:hidden}
.chart .row .fill{position:absolute;top:0;left:0;height:100%;width:0;border-radius:4px;transition:width 1.1s cubic-bezier(.2,.8,.2,1)}
.chart .row .val{font-family:var(--mono);font-size:11px;color:var(--sub);text-align:right}
.chart .fill.open{background:linear-gradient(90deg,#151515,#444)}
.chart .fill.closed{background:repeating-linear-gradient(45deg,#151515,#151515 5px,#3d3d3d 5px,#3d3d3d 10px)}
.chart .fill.good{background:linear-gradient(90deg,#151515,#333)}
.chart .fill.gain{background:linear-gradient(90deg,#5c5c5c,#8a8a8a)}
.chart .fill.flat{background:#d0d0d0}
.chart .fill.bad{background:repeating-linear-gradient(45deg,#c9c9c9,#c9c9c9 5px,#e2e2e2 5px,#e2e2e2 10px)}
.chart .zero{position:absolute;top:-2px;bottom:-2px;width:1px;background:#bbb}
.chart-legend{display:flex;gap:16px;flex-wrap:wrap;font-size:11px;color:var(--sub);margin:10px 0 0}
.chart-legend span{display:inline-flex;align-items:center;gap:6px}
.chart-legend i{width:14px;height:10px;border-radius:2px;display:inline-block}

/* ============================================================
   STANFORD THEME — cardinal red & white, logo top-right
   ============================================================ */
/* thin cardinal band pinned to the very top */
body::before{content:"";position:fixed;top:0;left:0;right:0;height:4px;
  background:linear-gradient(90deg,var(--cardinal-dark),var(--cardinal) 45%,var(--cardinal-bright));z-index:100}
::selection{background:var(--cardinal);color:#fff}
a{text-decoration-color:#e2b8b8}
a:hover{text-decoration-color:var(--cardinal)}

/* Stanford logo, fixed top-right */
.stanford-badge{position:fixed;top:14px;right:18px;z-index:101;display:block;line-height:0;
  filter:drop-shadow(0 2px 6px rgba(0,0,0,.18));transition:transform .5s cubic-bezier(.2,.8,.2,1)}
.stanford-badge img{height:52px;width:auto;display:block}
.stanford-badge:hover{transform:translateY(2px) scale(1.04) rotate(-2deg)}
@media(max-width:640px){.stanford-badge img{height:38px}}

/* nav accents */
.nav.scrolled{border-bottom-color:var(--cardinal);box-shadow:0 1px 16px rgba(140,21,21,.08)}
.nav nav a::after{background:var(--cardinal)}
.nav nav a:hover{color:var(--cardinal)}
.brand a{color:var(--cardinal-dark)}

/* headings + hero flourish in cardinal */
.hero h1{background:linear-gradient(100deg,var(--cardinal-dark) 0%,var(--cardinal) 55%,var(--cardinal-bright) 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent}
.kpi-n{background:linear-gradient(180deg,var(--cardinal),var(--cardinal-dark));-webkit-background-clip:text;background-clip:text;color:transparent}
.eyebrow{color:var(--cardinal)}
.eyebrow::before{background:var(--cardinal)}
h2{color:var(--cardinal-dark)}
.snum{color:var(--cardinal);opacity:.85}
.fnum{color:var(--cardinal-dark)}

/* section top-border tint */
section{border-top-color:var(--hair)}
.note{border-left-color:var(--cardinal);background:var(--cardinal-wash)}

/* tables */
thead th{background:var(--cardinal);color:#fff;border-bottom:2px solid var(--cardinal-dark)}
thead th:hover{background:var(--cardinal-dark)}
tbody tr:hover{background:var(--cardinal-wash)}
td.best{color:var(--cardinal-dark);font-weight:700}
.pos{color:var(--cardinal-dark);font-weight:700} .neg{color:#b9a3a3}

/* pills */
.pill{border-color:#e2cfcf}
.pill.good{background:var(--cardinal);color:#fff;border-color:var(--cardinal)}
.pill.gain{background:#fff;color:var(--cardinal);border-color:var(--cardinal)}
.pill.flat{background:#f2eaea;color:var(--sub)}
.pill.bad{background:#fff;color:var(--sub);border-color:#e2cfcf}
.pill.kind{background:#fff;color:var(--cardinal-dark);border-color:#e2cfcf}

/* cards */
.track{background:var(--cardinal-wash);border-color:#eddede}
.track:hover{box-shadow:0 10px 34px rgba(140,21,21,.10);border-color:var(--cardinal)}
.track .lab{color:var(--cardinal)}

/* code blocks keep dark but cardinal frame */
pre{border:1px solid var(--cardinal-dark);box-shadow:inset 3px 0 0 var(--cardinal)}

/* ---- charts: red & white ---- */
.chart .row .track2{background:#f3e9e9}
.chart .row .lab{color:var(--ink)}
.chart .fill.open{background:linear-gradient(90deg,var(--cardinal-dark),var(--cardinal-bright))}
.chart .fill.closed{background:repeating-linear-gradient(45deg,var(--cardinal),var(--cardinal) 5px,#c0575f 5px,#c0575f 10px)}
.chart .fill.good{background:linear-gradient(90deg,var(--cardinal-dark),var(--cardinal))}
.chart .fill.gain{background:linear-gradient(90deg,#b8555b,#d98a90)}
.chart .fill.flat{background:#e0cccc}
.chart .fill.bad{background:repeating-linear-gradient(45deg,#e6cccc,#e6cccc 5px,#f3e6e6 5px,#f3e6e6 10px)}
.chart .zero{background:var(--cardinal-dark)}
.chart-legend i{border-radius:2px}

/* ---- match reference exactly: sharp corners, neutral surfaces, font features ---- */
body{font-feature-settings:"ss01","ss02"}
.track,.tablewrap,.pill,pre,code,.chart .row .track2,.chart .row .fill,.note{border-radius:0}
.note{border-radius:0}
/* cards neutral grey (cardinal is accent-only, not a pink wash) */
.track{background:var(--wash);border-color:var(--hair)}
.track:hover{border-color:var(--cardinal);box-shadow:0 10px 34px rgba(140,21,21,.10)}
.chart .row .track2{background:#ececed}
.note{background:#faf6f6}
/* KernelAscent brand text in cardinal, sharp underline reveal */
.brand a{color:var(--cardinal-dark);font-weight:700;letter-spacing:-.01em}
.dek b{color:var(--cardinal-dark)}

/* ---- nav layout fix: Stanford logo in-flow at right (no overlap), mono uppercase links ---- */
.stanford-badge{display:none!important}   /* retired the fixed overlay */
.nav{padding:12px 30px}
.nav-right{display:flex;align-items:center;gap:26px;flex-wrap:wrap;justify-content:flex-end;max-width:none!important}
.nav-right nav{display:flex;gap:20px;flex-wrap:wrap}
.brand a{font-family:var(--mono);font-size:13px;font-weight:500;letter-spacing:.02em;color:var(--cardinal-dark)}
.logo{height:22px}
.nav nav a{font-family:var(--mono);font-size:11px;text-transform:uppercase;letter-spacing:.13em;color:var(--sub)}
.nav nav a:hover{color:var(--cardinal)}
.nav nav a::after{background:var(--cardinal);bottom:-4px}
/* Stanford logo, cleanly in the nav's right group */
.stanford{line-height:0;display:inline-flex;align-items:center;padding-left:6px;border-left:1px solid var(--hair);
  transition:transform .5s cubic-bezier(.2,.8,.2,1)}
.stanford img{height:36px;width:auto;display:block;filter:drop-shadow(0 1px 4px rgba(0,0,0,.16))}
.stanford:hover{transform:scale(1.05) rotate(-2deg)}
@media(max-width:640px){.stanford img{height:30px}.nav{padding:10px 18px}.nav-right{gap:14px}}

/* ---- mechanism dense multi-curve panels ---- */
.mechgrid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:18px 0}
@media(max-width:760px){.mechgrid{grid-template-columns:1fr}}
.mechpanel{margin:0;text-align:left}
.mechpanel figcaption{margin:0 0 6px;text-align:left}
.linechart{width:100%;height:180px;border:1px solid var(--hair);background:#fff}
.linechart svg{width:100%;height:100%}
.linechart .axis{stroke:#d4d4d8;stroke-width:1}
.linechart .zero{stroke:#c9a3a3;stroke-width:1;stroke-dasharray:3 3}
.linechart .grid{stroke:#f0eaea;stroke-width:1}
.linechart polyline{fill:none;stroke-width:2;vector-effect:non-scaling-stroke}
.linechart .dot{stroke:#fff;stroke-width:.6}