/* KernelLens — hand-crafted project page
   Palette derived from the logo: terracotta #c06048 on cream #f0f0d8. */

:root {
  --bg: #faf8f2;
  --ink: #1b1915;
  --muted: #6f6a5e;
  --line: #e8e3d7;
  --soft: #f3efe4;
  --card: #fffdf9;

  --brand: #c06048;
  --brand-ink: #8f4632;

  /* categorical series (validated for separation on this surface) */
  --c-eager: #d1493f;
  --c-compile: #d98324;
  --c-triton: #3f7cac;
  --c-kl: #2f8f6b;
  --c-trt: #7b4fa0;
  --c-cpu: #8c877c;

  /* decorative spectrum (logo-adjacent) */
  --s1: #c06048; --s2: #d98a2b; --s3: #2f8f6b; --s4: #3f7cac; --s5: #7b4fa0; --s6: #c9b458;

  --display: "Bricolage Grotesque", "Avenir Next", "Helvetica Neue", Arial, sans-serif;
  --body: "Instrument Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12110e; --ink: #f2efe6; --muted: #9a9488; --line: #2a2822; --soft: #1a1915; --card: #171612;
    --brand: #e0836a; --brand-ink: #f0a48d;
    --c-eager: #e2675d; --c-compile: #e59a3f; --c-triton: #5b9bd0; --c-kl: #43a97f; --c-trt: #a273c4;
    --c-cpu: #8c877c; --s6: #d9c46a;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: var(--body); font-size: 18px; line-height: 1.62;
  -webkit-font-smoothing: antialiased; overflow-x: hidden;
}
a { color: inherit; text-decoration: none; border-bottom: 1px solid var(--line); transition: border-color .15s; }
a:hover { border-bottom-color: var(--ink); }
a:focus-visible, button:focus-visible, summary:focus-visible, select:focus-visible {
  outline: 2px solid var(--brand); outline-offset: 3px; border-radius: 4px;
}
code { font-family: var(--mono); font-size: .88em; }
img { max-width: 100%; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

#progress {
  position: fixed; top: 0; left: 0; height: 4px; width: 100%; z-index: 50;
  transform-origin: left; transform: scaleX(0);
  background: var(--brand);
}
#glow {
  position: fixed; inset: 0; z-index: -1; pointer-events: none; opacity: 0; transition: opacity .5s;
  background: radial-gradient(circle 360px at var(--gx, 50%) var(--gy, 50%), color-mix(in srgb, var(--brand) 14%, transparent), transparent 100%);
}
#glow.on { opacity: 1; }

/* nav */
nav {
  position: sticky; top: 0; z-index: 40; backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--bg) 82%, transparent); border-bottom: 1px solid var(--line);
}
nav .inner { display: flex; justify-content: space-between; align-items: center; padding: 14px 0; font-size: 14px; }
nav .brand { display: flex; align-items: center; gap: 10px; border: 0; font-family: var(--display); font-weight: 800; font-size: 20px; letter-spacing: -.02em; }
nav .brand img { width: 26px; height: 26px; border-radius: 7px; }
nav .links { display: flex; gap: 20px; flex-wrap: wrap; }
nav .links a { border: 0; color: var(--muted); }
nav .links a:hover, nav .links a.active { color: var(--ink); }
nav .links a.active { font-weight: 600; }

/* hero */
.hero { display: grid; grid-template-columns: 1.1fr .9fr; gap: 32px; align-items: center; padding: 60px 0 78px; }
.kicker { display: inline-flex; align-items: center; gap: 10px; font-size: 14px; color: var(--muted); }
.kicker i {
  display: inline-block; width: 34px; height: 8px; border-radius: 4px;
  background: var(--brand);
}
h1 { font-family: var(--display); font-weight: 800; font-size: clamp(44px, 7vw, 84px); line-height: .97; letter-spacing: -.045em; margin: 20px 0 24px; }
h1 em { font-style: normal; color: var(--brand); }
.lede { font-size: clamp(18px, 2vw, 21px); color: var(--muted); max-width: 32em; margin: 0 0 30px; }
.cta { display: flex; gap: 12px; flex-wrap: wrap; font-size: 15px; font-weight: 500; }
.btn { border: 1.5px solid var(--ink); padding: 11px 18px; border-radius: 999px; transition: transform .15s, background .15s, color .15s; }
.btn:hover { transform: translateY(-2px); }
.btn.solid { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.btn.brand { background: var(--brand); color: #fff; border-color: var(--brand); }
.pills { margin-top: 24px; display: flex; gap: 8px; flex-wrap: wrap; }
.pill { font-size: 14px; border: 1px solid var(--line); border-radius: 999px; padding: 3px 12px; color: var(--muted); background: var(--card); }

/* hero pipeline graphic */
.stage-wrap { position: relative; }
#stage { width: 100%; height: auto; overflow: visible; }
#stage .node rect { transition: transform .25s cubic-bezier(.2,.8,.2,1), filter .2s; transform-box: fill-box; transform-origin: center; }
#stage .node:hover rect, #stage .node.on rect { transform: translateY(-4px); filter: drop-shadow(0 8px 14px rgba(0,0,0,.12)); }
#stage text { font-family: var(--body); }
#stage .t { font-weight: 700; fill: var(--ink); font-size: 15px; }
#stage .s { fill: var(--muted); font-size: 12.5px; }
#stage-tip { margin-top: 10px; font-size: 14.5px; color: var(--muted); min-height: 3em; }
#stage-tip b { color: var(--ink); }

/* sections */
section { padding: 78px 0; border-top: 1px solid var(--line); }
.tag { display: inline-flex; align-items: center; gap: 9px; font-size: 15px; color: var(--muted); font-weight: 500; }
.tag::before { content: ""; width: 10px; height: 10px; border-radius: 3px; background: var(--dot, var(--brand)); transform: rotate(45deg); }
h2 { font-family: var(--display); font-weight: 800; font-size: clamp(30px, 4.3vw, 50px); letter-spacing: -.035em; line-height: 1.05; margin: 14px 0 20px; max-width: 20em; }
h3 { font-family: var(--display); font-weight: 700; font-size: 20px; letter-spacing: -.015em; margin: 0 0 6px; }
p { margin: 0 0 16px; max-width: 46em; }
.muted { color: var(--muted); }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 34px; margin-top: 38px; }
.grid2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; margin-top: 34px; }
.col { border-top: 3px solid var(--dot, var(--brand)); padding-top: 16px; }
.col p { color: var(--muted); font-size: 15.5px; }
.note { font-size: 14.5px; color: var(--muted); margin-top: 14px; max-width: 54em; }

/* reveal on scroll (only when JS is available, so no-JS still shows content) */
.js .rv { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s cubic-bezier(.2,.8,.2,1); }
.js .rv.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .js .rv { opacity: 1; transform: none; } }

/* stats */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 38px; }
.stat { padding: 22px; border-radius: 14px; background: var(--card); border: 1px solid var(--line); position: relative; overflow: hidden; transition: transform .25s, border-color .2s; }
.stat::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 5px; background: var(--dot, var(--brand)); }
.stat:hover { transform: translateY(-4px); border-color: var(--dot, var(--brand)); }
.num { font-family: var(--display); font-size: clamp(32px, 4vw, 50px); font-weight: 800; letter-spacing: -.04em; line-height: 1; font-variant-numeric: tabular-nums; }
.stat p { font-size: 14px; color: var(--muted); margin: 12px 0 0; }

/* charts */
figure.chart { margin: 34px 0 0; padding: 22px 22px 16px; border-radius: 16px; background: var(--card); border: 1px solid var(--line); }
figure.chart figcaption { display: flex; justify-content: space-between; align-items: flex-end; gap: 16px; flex-wrap: wrap; margin-bottom: 14px; }
.ctitle { font-family: var(--display); font-weight: 700; font-size: 19px; letter-spacing: -.01em; }
.csub { font-size: 14.5px; color: var(--muted); }
.ctrl { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; padding: 3px; background: var(--soft); }
.seg button { font: inherit; font-size: 14px; font-weight: 500; color: var(--muted); background: none; border: 0; padding: 5px 12px; border-radius: 999px; cursor: pointer; transition: background .15s, color .15s; }
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--bg); }
.legend { display: flex; gap: 8px 12px; flex-wrap: wrap; margin-top: 12px; }
.legend button { font: inherit; font-size: 14px; display: inline-flex; align-items: center; gap: 7px; background: none; border: 1px solid var(--line); border-radius: 999px; padding: 4px 11px 4px 9px; cursor: pointer; color: var(--ink); transition: opacity .2s; }
.legend button i { width: 10px; height: 10px; border-radius: 3px; background: var(--c); }
.legend button[aria-pressed="false"] { opacity: .4; }
.plot { width: 100%; position: relative; }
.plot svg { display: block; width: 100%; height: auto; overflow: visible; }
.plot text { font-family: var(--body); fill: var(--muted); font-size: 12px; }
.plot .lab { fill: var(--ink); font-size: 12.5px; }
.plot .lab.w { font-weight: 600; }
.plot .grid { stroke: var(--line); stroke-width: 1; }
.plot .axis { stroke: var(--muted); stroke-width: 1; opacity: .45; }
.plot .bar { transform-box: fill-box; transform-origin: center bottom; animation: growy .7s cubic-bezier(.2,.8,.2,1) both; animation-delay: var(--d, 0s); }
.plot .barh { transform-box: fill-box; transform-origin: left center; animation: growx .7s cubic-bezier(.2,.8,.2,1) both; animation-delay: var(--d, 0s); }
@keyframes growy { from { transform: scaleY(0); } to { transform: scaleY(1); } }
@keyframes growx { from { transform: scaleX(0); } to { transform: scaleX(1); } }
.plot .hit { fill: transparent; cursor: pointer; }
.plot .hit:hover + .bar, .plot .bar:hover { filter: brightness(1.08); }
#tip { position: fixed; z-index: 60; pointer-events: none; background: var(--ink); color: var(--bg); padding: 9px 12px; border-radius: 10px;
       font-size: 13px; line-height: 1.45; opacity: 0; transform: translateY(6px); transition: opacity .12s, transform .12s; max-width: 280px; box-shadow: 0 8px 24px rgba(0,0,0,.18); }
#tip.on { opacity: 1; transform: none; }
#tip i { display: inline-block; width: 8px; height: 8px; border-radius: 2px; margin-right: 6px; }
#tip .r { display: flex; justify-content: space-between; gap: 18px; font-variant-numeric: tabular-nums; }

/* tables */
table { width: 100%; border-collapse: collapse; margin-top: 26px; font-size: 15px; }
th, td { text-align: left; padding: 11px 13px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: 13px; font-weight: 600; color: var(--muted); }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
tr.hl td { background: color-mix(in srgb, var(--brand) 7%, transparent); }
.v { font-size: 12.5px; font-weight: 600; border-radius: 999px; padding: 2px 11px; border: 1.5px solid currentColor; white-space: nowrap; }
.v.yes { color: var(--c-kl); } .v.no { color: var(--c-eager); } .v.part { color: var(--c-compile); }

/* code */
pre { background: var(--soft); border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px; overflow-x: auto; font-family: var(--mono); font-size: 13.5px; line-height: 1.7; margin: 22px 0 0; }
pre .k { color: var(--brand-ink); font-weight: 600; }
pre .c { color: var(--muted); }
.tabs { display: flex; gap: 6px; margin: 22px 0 0; }
.tabs button { font: inherit; font-size: 13px; border: 1px solid var(--line); background: var(--soft); color: var(--muted); border-radius: 999px; padding: 6px 14px; cursor: pointer; }
.tabs button[aria-pressed="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }

/* figures */
figure.shot { margin: 34px 0 0; }
figure.shot img { border: 1px solid var(--line); border-radius: 16px; background: transparent; max-width: 100%; }
figure.shot picture { display: block; }
figure.shot picture img { width: 100%; }
figure.shot figcaption { font-size: 14.5px; color: var(--muted); margin-top: 10px; }
@media (prefers-color-scheme: dark) {
  figure.shot img.invert { filter: invert(1) hue-rotate(180deg); }
}

/* compare cards */
.cmp > div { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 24px; }
.cmp ul { margin: 10px 0 0; padding-left: 18px; color: var(--muted); font-size: 15.5px; }
.cmp li { margin: 8px 0; }

/* steps */
.steps { margin: 26px 0 0; padding: 0; list-style: none; }
.steps li { display: grid; grid-template-columns: 22px 1fr 120px; gap: 14px; align-items: center; padding: 13px 0; border-bottom: 1px solid var(--line); font-size: 15.5px; }
.steps .d { width: 14px; height: 14px; border-radius: 4px; background: var(--dot, var(--brand)); transition: transform .25s; }
.steps li:hover .d { transform: rotate(45deg) scale(1.15); }
.steps .s { text-align: right; font-size: 13.5px; color: var(--muted); }
.steps .s.done { color: var(--c-kl); font-weight: 600; }
.steps .s.fix { color: var(--c-eager); font-weight: 600; }

/* faq */
details { border-bottom: 1px solid var(--line); padding: 18px 0; }
summary { cursor: pointer; font-weight: 600; list-style: none; font-family: var(--display); font-size: 18px; }
summary::-webkit-details-marker { display: none; }
summary::before { content: "+"; display: inline-block; width: 22px; color: var(--brand); font-weight: 800; }
details[open] summary::before { content: "\2013"; }
details p { margin: 10px 0 0 22px; color: var(--muted); font-size: 16px; }

footer { border-top: 1px solid var(--line); padding: 34px 0 56px; font-size: 14px; color: var(--muted); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.stripe-end { height: 10px; background: var(--brand); }

@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; padding: 30px 0 56px; }
  .stage-wrap { order: -1; }
  .grid3, .grid2 { grid-template-columns: 1fr; gap: 22px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .steps li { grid-template-columns: 22px 1fr; }
  .steps .s { grid-column: 2; text-align: left; }
  section { padding: 58px 0; }
  nav .links { display: none; }
  figure.chart { padding: 16px 12px 12px; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  .plot .bar, .plot .barh { animation: none; }
}
/* viz: bar-list and dot-plot comparisons (replaces data tables) */
.viz { margin-top: 24px; border: 1px solid var(--line); border-radius: 14px; background: var(--card); padding: 4px 18px 14px; }
.vizh { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px; padding: 13px 0 9px; font-size: 14px; color: var(--muted); border-bottom: 1px solid var(--line); }
.vizh b { color: var(--ink); font-weight: 600; }
.vgrp { padding: 12px 0 2px; font: 600 13px/1 var(--display); letter-spacing: .05em; text-transform: uppercase; color: var(--muted); }
.vgrp:first-child { padding-top: 4px; }
.vrow { display: grid; grid-template-columns: minmax(150px, 1.5fr) 3fr 74px; align-items: center; gap: 12px; padding: 5px 0; }
.vrow:hover { background: var(--soft); }
.vlab { font-size: 15px; line-height: 1.3; }
.vlab small { display: block; color: var(--muted); font-size: 13px; }
.vtrack { display: flex; flex-direction: column; gap: 3px; }
.vbar { height: 10px; border-radius: 3px; background: var(--c, var(--muted)); min-width: 2px; }
.vval { text-align: right; font-size: 14px; font-variant-numeric: tabular-nums; color: var(--muted); }
.vrow.win .vval { color: var(--ink); font-weight: 600; }
.vnote { padding: 12px 0 4px; font-size: 14.5px; color: var(--muted); border-top: 1px dashed var(--line); margin-top: 10px; }
.vsteps { display: flex; gap: 18px; flex-wrap: wrap; padding: 10px 0 2px; font-size: 13px; color: var(--muted); }
.vsteps i { display: inline-block; width: 9px; height: 9px; border-radius: 2px; margin-right: 6px; background: var(--c); }
.vgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 6px 16px; padding: 12px 0 4px; }
.vcell { display: flex; align-items: center; gap: 9px; font-size: 14.5px; }
.vdot { flex: none; width: 11px; height: 11px; border-radius: 50%; background: var(--c); }
.vcell em { font-style: normal; margin-left: auto; font-size: 13px; color: var(--muted); font-variant-numeric: tabular-nums; }
@media (max-width: 620px) { .vrow { grid-template-columns: 1fr; gap: 4px; } .vval { text-align: left; } }

/* card grid + signature list (replace the last two tables) */
.gaps { display: grid; grid-template-columns: repeat(auto-fill, minmax(268px, 1fr)); gap: 14px; margin-top: 26px; }
.gap { border: 1px solid var(--line); border-radius: 14px; background: var(--card); padding: 15px 18px 16px; }
.gap h4 { margin: 0 0 7px; font: 600 16px/1.3 var(--display); }
.gap h4::before { content: ""; display: inline-block; width: 8px; height: 8px; border-radius: 2px; margin-right: 9px; background: var(--dot, var(--s1)); vertical-align: middle; }
.gap p { margin: 0; font-size: 15px; line-height: 1.55; color: var(--muted); }
.api { margin-top: 24px; }
.apirow { display: grid; grid-template-columns: minmax(230px, 1fr) 2.1fr; gap: 18px; align-items: baseline; padding: 12px 0; border-bottom: 1px dashed var(--line); }
.apirow:last-child { border-bottom: 0; }
.apirow p { margin: 0; font-size: 15.5px; color: var(--muted); line-height: 1.55; }
@media (max-width: 620px) { .apirow { grid-template-columns: 1fr; gap: 5px; } }