/* =========================================================
   TrainScience — design tokens
   Ink (dark, lab) sections alternate with Paper (editorial).
   ========================================================= */
:root {
  --ink: #0b0d0e;
  --ink-2: #121517;
  --ink-3: #1a1e21;
  --line: rgba(236, 233, 225, .12);
  --line-2: rgba(236, 233, 225, .22);
  --fg: #ece9e1;
  --fg-2: rgba(236, 233, 225, .66);
  --fg-3: rgba(236, 233, 225, .44);

  --paper: #efebe2;
  --paper-2: #e5e0d4;
  --paper-fg: #14171a;
  --paper-fg-2: rgba(20, 23, 26, .64);
  --paper-line: rgba(20, 23, 26, .14);

  --accent: #c8f53c;      /* lab lime */
  --accent-ink: #0b0d0e;
  --long: #5fe0c1;        /* longevity – mint */
  --str: #ff7a45;         /* strength – ember */
  --end: #6aa8ff;         /* endurance – signal blue */

  --serif: "Instrument Serif", Georgia, serif;
  --sans: "Inter Tight", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Consolas, monospace;

  --r: 14px;
  --r-lg: 22px;
  --wrap: 1240px;
  --gutter: clamp(16px, 4vw, 40px);
  --ease: cubic-bezier(.2, .7, .2, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--ink);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 { margin: 0; font-weight: 600; letter-spacing: -.02em; line-height: 1.05; }
p { margin: 0; }
em { font-family: var(--serif); font-style: italic; font-weight: 400; letter-spacing: -.01em; }
::selection { background: var(--accent); color: var(--accent-ink); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter); }
.mono { font-family: var(--mono); font-size: .78em; letter-spacing: .02em; }
.muted { color: var(--fg-3); }
.small { font-size: 14px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .5em;
  padding: 14px 22px; border-radius: 999px;
  font: 600 15px/1 var(--sans); letter-spacing: -.005em;
  border: 1px solid transparent; cursor: pointer;
  transition: transform .25s var(--ease), background .25s, border-color .25s, color .25s;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn-sm { padding: 10px 16px; font-size: 14px; }
.btn-accent { background: var(--accent); color: var(--accent-ink); }
.btn-accent:hover { background: #d8ff5c; }
.btn-line { border-color: var(--line-2); color: var(--fg); }
.btn-line:hover { border-color: var(--fg); }
.paper .btn-line { border-color: var(--paper-line); color: var(--paper-fg); }

/* ---------- Kicker / headings ---------- */
.kicker {
  display: inline-flex; align-items: center; gap: 10px;
  font: 500 12px/1 var(--mono); text-transform: uppercase; letter-spacing: .14em;
  color: var(--accent); margin-bottom: 22px;
}
.kicker.dark { color: var(--paper-fg-2); }
.kicker::before { content: ""; width: 18px; height: 1px; background: currentColor; }
.hero .kicker::before { display: none; }
.pulse { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 0 rgba(200,245,60,.6); animation: pulse 2.2s infinite; }
@keyframes pulse { 70% { box-shadow: 0 0 0 10px rgba(200,245,60,0); } 100% { box-shadow: 0 0 0 0 rgba(200,245,60,0); } }

h2 { font-size: clamp(38px, 5.6vw, 76px); }
h2 em { color: var(--accent); }
.paper h2 em { color: var(--paper-fg); }
.sub { color: var(--fg-2); max-width: 560px; margin-top: 20px; font-size: 18px; }
.paper .sub { color: var(--paper-fg-2); }

/* =========================================================
   Header
   ========================================================= */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(11, 13, 14, .72);
  backdrop-filter: saturate(1.4) blur(14px);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s;
}
.site-header.scrolled { border-bottom-color: var(--line); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 72px; gap: 24px; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-size: 19px; font-weight: 500; letter-spacing: -.02em; }
.logo b { font-weight: 700; }
.logo-mark { width: 26px; height: 26px; fill: none; stroke: var(--accent); stroke-width: 2.6; stroke-linecap: round; stroke-linejoin: round; }
.nav-links { display: flex; gap: 32px; font-size: 15px; color: var(--fg-2); }
.nav-links a { position: relative; transition: color .2s; }
.nav-links a:hover { color: var(--fg); }
.nav-right { display: flex; align-items: center; gap: 14px; }
.lang { display: flex; border: 1px solid var(--line); border-radius: 999px; padding: 3px; font: 500 12px/1 var(--mono); }
.lang a { padding: 6px 9px; border-radius: 999px; color: var(--fg-3); transition: color .2s; }
.lang a:hover { color: var(--fg); }
.lang a.on { background: var(--fg); color: var(--ink); }
.nav-toggle { display: none; background: none; border: 0; width: 40px; height: 40px; cursor: pointer; position: relative; }
.nav-toggle span { position: absolute; left: 10px; right: 10px; height: 2px; background: var(--fg); transition: transform .3s var(--ease); }
.nav-toggle span:first-child { top: 15px; }
.nav-toggle span:last-child { top: 23px; }
.nav-toggle[aria-expanded="true"] span:first-child { transform: translateY(4px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:last-child { transform: translateY(-4px) rotate(-45deg); }

/* =========================================================
   Hero
   ========================================================= */
.hero {
  position: relative; padding: clamp(48px, 8vw, 110px) 0 0;
  background:
    radial-gradient(900px 500px at 85% 10%, rgba(200,245,60,.07), transparent 60%),
    radial-gradient(700px 500px at 0% 100%, rgba(106,168,255,.06), transparent 60%);
}
.hero::before { /* lab grid */
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse at 60% 30%, #000 10%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at 60% 30%, #000 10%, transparent 70%);
  opacity: .5;
}
.hero-grid { position: relative; display: grid; grid-template-columns: 1.05fr 1fr; gap: clamp(32px, 5vw, 72px); align-items: center; }
h1 { font-size: clamp(48px, 7.6vw, 108px); line-height: .96; letter-spacing: -.035em; font-weight: 600; }
h1 em { color: var(--accent); font-size: 1.04em; letter-spacing: -.02em; }
.lead { font-size: clamp(17px, 1.5vw, 20px); color: var(--fg-2); max-width: 540px; margin-top: 28px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }
.hero-facts { list-style: none; padding: 0; margin: 44px 0 0; display: flex; flex-wrap: wrap; gap: 10px 28px; color: var(--fg-3); font-size: 13px; }
.hero-facts b { color: var(--fg); font-weight: 500; }

.hero-chart {
  margin: 0; padding: 22px 22px 18px;
  background: linear-gradient(180deg, rgba(255,255,255,.035), rgba(255,255,255,.01));
  border: 1px solid var(--line); border-radius: var(--r-lg);
  box-shadow: 0 40px 80px -40px rgba(0,0,0,.6), inset 0 1px 0 rgba(255,255,255,.04);
}
.chart-head { display: flex; justify-content: space-between; color: var(--fg-2); font-size: 11.5px; text-transform: uppercase; letter-spacing: .1em; padding-bottom: 12px; border-bottom: 1px dashed var(--line); }
.chart { width: 100%; height: auto; margin-top: 8px; overflow: visible; }
.chart .grid line { stroke: var(--line); stroke-width: 1; }
.chart .grid .axis { stroke: var(--line-2); }
.chart .ticks text { fill: var(--fg-3); font-size: 11px; font-family: var(--mono); }
.chart .axis-label { letter-spacing: .12em; font-size: 10px; }
.chart .threshold { stroke: var(--str); stroke-dasharray: 3 5; stroke-width: 1.2; opacity: .7; }
.chart .threshold-label { fill: var(--str); font-size: 10.5px; opacity: .9; }
.chart .line { fill: none; stroke-width: 3; stroke-linecap: round; }
.chart .line-trained { stroke: var(--accent); }
.chart .line-untrained { stroke: var(--fg-3); stroke-dasharray: 2 7; stroke-width: 2.4; }
.chart .dot-trained { fill: var(--accent); }
.chart .dot-untrained { fill: var(--fg-3); }
.chart .lbl { font: 600 14px var(--sans); }
.chart .lbl-trained { fill: var(--accent); }
.chart .lbl-untrained { fill: var(--fg-2); }
.chart .gap { stroke: var(--fg-2); stroke-width: 1; stroke-dasharray: 2 3; }
.chart .gap-label { fill: var(--fg-2); font-size: 11px; }
.chart-legend { display: flex; gap: 20px; color: var(--fg-3); font-size: 11.5px; padding-top: 10px; border-top: 1px dashed var(--line); }
.sw { display: inline-block; width: 14px; height: 3px; border-radius: 2px; vertical-align: middle; margin-right: 6px; }
.sw-t { background: var(--accent); }

/* chart draw-in animation */
.js .chart .line-trained, .js .chart .line-untrained { stroke-dasharray: 800; stroke-dashoffset: 800; }
.js .chart .area, .js .chart .lbl, .js .chart .gap, .js .chart .gap-label, .js .chart circle { opacity: 0; transition: opacity .8s ease .9s; }
.js .chart.drawn .line-trained { animation: draw 1.6s var(--ease) forwards; }
.js .chart.drawn .line-untrained { animation: draw 1.6s var(--ease) .2s forwards, dashback 0s 1.8s forwards; }
.js .chart.drawn .area, .js .chart.drawn .lbl, .js .chart.drawn .gap, .js .chart.drawn .gap-label, .js .chart.drawn circle { opacity: 1; }
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes dashback { to { stroke-dasharray: 2 7; stroke-dashoffset: 0; } }

/* ticker */
.ticker { margin-top: clamp(56px, 8vw, 100px); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); overflow: hidden; padding: 16px 0; }
.ticker-track { display: flex; gap: 48px; width: max-content; animation: marquee 48s linear infinite; color: var(--fg-3); font-size: 13px; text-transform: uppercase; letter-spacing: .12em; }
.ticker-track span { display: inline-flex; align-items: center; gap: 48px; }
.ticker-track span::after { content: "✦"; color: var(--accent); font-size: 10px; }
@keyframes marquee { to { transform: translateX(-50%); } }

/* =========================================================
   Loop (Read → Translate → Train → Measure)
   ========================================================= */
.loop { padding-top: clamp(56px, 7vw, 96px); padding-bottom: clamp(56px, 7vw, 96px); }
.loop-steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); }
.loop-steps li { padding: 28px 28px 0 0; position: relative; }
.loop-steps li + li { padding-left: 28px; border-left: 1px solid var(--line); }
.loop-steps .n { color: var(--accent); }
.loop-steps h3 { font-size: 28px; margin: 18px 0 10px; }
.loop-steps p { color: var(--fg-2); font-size: 15.5px; }

/* =========================================================
   Sections
   ========================================================= */
.section { padding: clamp(80px, 10vw, 150px) 0; position: relative; }
.paper { background: var(--paper); color: var(--paper-fg); }
.paper .kicker::before { background: currentColor; }
.sec-head { margin-bottom: clamp(40px, 6vw, 72px); }
.sec-head.split { display: flex; justify-content: space-between; align-items: flex-end; gap: 32px; flex-wrap: wrap; }
.sec-head.split .sub { margin-top: 20px; }

/* ---------- Pillars ---------- */
.pillars { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.pillar {
  --c: var(--accent);
  background: var(--ink); color: var(--fg);
  border-radius: var(--r-lg); padding: 28px 28px 32px;
  display: flex; flex-direction: column; min-height: 440px;
  position: relative; overflow: hidden;
  transition: transform .5s var(--ease);
}
.pillar:hover { transform: translateY(-6px); }
.pillar::after { /* colored glow */
  content: ""; position: absolute; width: 320px; height: 320px; right: -120px; top: -120px;
  background: radial-gradient(circle, var(--c), transparent 65%); opacity: .22; transition: opacity .5s;
}
.pillar:hover::after { opacity: .4; }
.p-long { --c: var(--long); } .p-str { --c: var(--str); } .p-end { --c: var(--end); }
.pillar-top { display: flex; justify-content: space-between; color: var(--c); font-size: 12px; letter-spacing: .14em; }
.pillar h3 { font-family: var(--serif); font-weight: 400; font-style: italic; font-size: clamp(48px, 5vw, 68px); letter-spacing: -.02em; margin-top: auto; padding-top: 80px; }
.pillar p { color: var(--fg-2); margin-top: 14px; font-size: 15.5px; }
.pillar ul { list-style: none; padding: 0; margin: 22px 0 0; display: flex; flex-wrap: wrap; gap: 6px; }
.pillar li { border: 1px solid var(--line-2); border-radius: 999px; padding: 5px 10px; font-size: 11.5px; color: var(--fg-2); }

/* ---------- Tags ---------- */
.tag { display: inline-flex; align-items: center; gap: 6px; font: 500 11px/1 var(--mono); text-transform: uppercase; letter-spacing: .1em; padding: 6px 9px; border-radius: 6px; }
.tag::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.t-long { color: var(--long); background: rgba(95,224,193,.1); }
.t-str  { color: var(--str);  background: rgba(255,122,69,.1); }
.t-end  { color: var(--end);  background: rgba(106,168,255,.1); }
.paper .t-long { color: #0d7a62; background: rgba(13,122,98,.1); }
.paper .t-str  { color: #c2410c; background: rgba(194,65,12,.1); }
.paper .t-end  { color: #1d5fd1; background: rgba(29,95,209,.1); }

/* ---------- Research ---------- */
.filters { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { background: transparent; color: var(--fg-2); border: 1px solid var(--line-2); border-radius: 999px; padding: 9px 16px; font: 500 14px var(--sans); cursor: pointer; transition: all .2s; }
.chip:hover { color: var(--fg); border-color: var(--fg-2); }
.chip.on { background: var(--fg); color: var(--ink); border-color: var(--fg); }

.papers { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.paper-card {
  background: var(--ink-2); border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 26px; display: flex; flex-direction: column; gap: 14px;
  transition: border-color .3s, transform .4s var(--ease), opacity .3s;
}
.paper-card:hover { border-color: var(--line-2); transform: translateY(-3px); }
.paper-card.feature { grid-column: span 3; display: grid; grid-template-columns: 1.2fr 1fr; gap: 14px 48px; padding: 36px; background: linear-gradient(135deg, rgba(95,224,193,.08), transparent 55%), var(--ink-2); }
.paper-card.feature .pc-meta { grid-column: 1 / -1; }
.paper-card.feature h3 { font-size: clamp(28px, 3.2vw, 44px); grid-row: span 3; }
.paper-card.hide { display: none; }
.pc-meta { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
.ev { display: inline-flex; align-items: center; gap: 3px; color: var(--fg-3); font-size: 11px; }
.ev i { width: 6px; height: 12px; border-radius: 2px; background: var(--line-2); }
.ev i.f { background: var(--fg-2); }
.ev i:last-of-type { margin-right: 6px; }
.paper-card h3 { font-size: 22px; line-height: 1.18; }
.paper-card p { color: var(--fg-2); font-size: 15.5px; }
.so-what { border-left: 2px solid var(--accent); padding: 4px 0 4px 14px; font-size: 15px; }
.so-what .mono { color: var(--accent); margin-right: 6px; font-size: 11px; }
.cite { color: var(--fg-3) !important; font-size: 11.5px !important; margin-top: auto; padding-top: 12px; border-top: 1px dashed var(--line); }
.fineprint { color: var(--fg-3); margin-top: 20px; font-size: 11.5px; }

/* ---------- Protocols (spec sheets) ---------- */
.protocols { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.spec { background: #f7f4ec; border: 1px solid var(--paper-line); border-radius: var(--r-lg); padding: 28px; transition: transform .4s var(--ease), box-shadow .4s; }
.spec:hover { transform: translateY(-3px); box-shadow: 0 24px 48px -28px rgba(20,23,26,.35); }
.spec header { display: flex; justify-content: space-between; align-items: center; }
.spec .code { color: var(--paper-fg-2); font-size: 12px; }
.spec h3 { font-family: var(--serif); font-weight: 400; font-size: clamp(34px, 3.4vw, 46px); letter-spacing: -.015em; margin: 36px 0 22px; }
.spec dl { margin: 0; font-size: 13px; }
.spec dl div { display: grid; grid-template-columns: 120px 1fr; gap: 16px; padding: 12px 0; border-top: 1px solid var(--paper-line); }
.spec dt { color: var(--paper-fg-2); text-transform: uppercase; letter-spacing: .08em; font-size: 11px; padding-top: 2px; }
.spec dd { margin: 0; color: var(--paper-fg); }

/* ---------- Sessions ---------- */
.sessions { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.session {
  --c: var(--accent);
  border: 1px solid var(--line); border-radius: var(--r-lg); padding: 24px;
  display: flex; flex-direction: column; min-height: 360px; position: relative; overflow: hidden;
  background: var(--ink-2); transition: border-color .3s, transform .4s var(--ease);
}
.session::before { content: ""; position: absolute; left: 0; right: 0; top: 0; height: 3px; background: var(--c); }
.session:hover { border-color: var(--line-2); transform: translateY(-4px); }
.s-str { --c: var(--str); } .s-end { --c: var(--end); } .s-long { --c: var(--long); }
.s-one { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.s-one::before { display: none; }
.s-one p, .s-one .s-top { color: rgba(11,13,14,.7) !important; }
.s-one .btn-accent { background: var(--ink); color: var(--fg); align-self: flex-start; }
.s-top { display: flex; justify-content: space-between; color: var(--fg-3); font-size: 11.5px; text-transform: uppercase; letter-spacing: .08em; }
.session h3 { font-size: 30px; margin: auto 0 12px; padding-top: 60px; }
.session p { color: var(--fg-2); font-size: 15px; margin-bottom: 20px; }
.times { list-style: none; padding: 16px 0 0; margin: 0; border-top: 1px dashed var(--line); display: grid; gap: 6px; color: var(--fg-2); font-size: 12.5px; }
.times b { color: var(--fg); font-weight: 500; margin-right: 6px; }

/* ---------- Lab ---------- */
.lab { background: var(--ink-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); overflow: hidden; }
.lab::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: radial-gradient(var(--line) 1px, transparent 1px);
  background-size: 22px 22px; opacity: .6;
  mask-image: linear-gradient(180deg, transparent, #000 30%, #000 70%, transparent);
  -webkit-mask-image: linear-gradient(180deg, transparent, #000 30%, #000 70%, transparent);
}
.lab .wrap { position: relative; }
.lab-grid { display: grid; grid-template-columns: 1fr 1.15fr; gap: 16px; }
.label { color: var(--fg-3); text-transform: uppercase; letter-spacing: .14em; font-size: 11.5px; font-weight: 500; margin-bottom: 18px; }
.tests, .studies { background: var(--ink); border: 1px solid var(--line); border-radius: var(--r-lg); padding: 28px; }
.tests ul { list-style: none; padding: 0; margin: 0 0 28px; }
.tests li { display: flex; justify-content: space-between; gap: 16px; padding: 16px 0; border-top: 1px solid var(--line); font-size: 16px; }
.tests li .mono { color: var(--accent); }
.studies { display: flex; flex-direction: column; gap: 14px; }
.studies .label { margin-bottom: 4px; }
.study { border: 1px solid var(--line); border-radius: var(--r); padding: 20px; background: var(--ink-2); }
.st-top { display: flex; justify-content: space-between; color: var(--fg-3); font-size: 11.5px; }
.status.rec { color: var(--accent); }
.status.run { color: var(--end); }
.study h4 { font-size: 20px; margin: 14px 0 8px; letter-spacing: -.015em; }
.study p { color: var(--fg-2); font-size: 14.5px; }
.study p.small { color: var(--fg-3); margin-top: 8px; font-size: 11.5px; }
.meter { height: 4px; background: var(--line); border-radius: 4px; margin-top: 16px; overflow: hidden; }
.meter i { display: block; height: 100%; width: 100%; background: var(--accent); transform-origin: left; transform: scaleX(var(--v)); transition: transform 1.4s var(--ease); }
.js .meter:not(.in) i { transform: scaleX(0); }
.studies .btn { align-self: flex-start; margin-top: 6px; }

/* ---------- Manifesto ---------- */
.manifesto ol { list-style: none; padding: 0; margin: 0; }
.manifesto li { display: grid; grid-template-columns: 80px 1fr; gap: 24px; padding: 28px 0; border-top: 1px solid var(--paper-line); align-items: baseline; }
.manifesto li:last-child { border-bottom: 1px solid var(--paper-line); }
.manifesto li .mono { color: var(--paper-fg-2); font-size: 13px; }
.manifesto li p { font-size: clamp(22px, 2.8vw, 38px); line-height: 1.2; letter-spacing: -.02em; color: var(--paper-fg-2); }
.manifesto li b { color: var(--paper-fg); font-weight: 600; }

/* ---------- Join ---------- */
.join { background: radial-gradient(800px 480px at 90% 100%, rgba(200,245,60,.09), transparent 60%), var(--ink); }
.join-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: clamp(32px, 6vw, 80px); align-items: start; }
.newsletter { margin-top: 44px; padding: 22px; border: 1px dashed var(--line-2); border-radius: var(--r); max-width: 420px; }
.newsletter .label { color: var(--accent); margin-bottom: 8px; }
.newsletter p:last-child { color: var(--fg-2); font-size: 15px; }

.form { background: var(--ink-2); border: 1px solid var(--line); border-radius: var(--r-lg); padding: clamp(22px, 3vw, 36px); display: grid; gap: 20px; }
.form .row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form label { display: grid; gap: 8px; font-size: 13px; color: var(--fg-2); font-weight: 500; }
.form .opt { color: var(--fg-3); font-weight: 400; }
.form input[type=text], .form input[type=email], .form textarea {
  width: 100%; background: var(--ink); color: var(--fg); border: 1px solid var(--line-2); border-radius: 10px;
  padding: 13px 14px; font: 16px var(--sans); transition: border-color .2s; resize: vertical;
}
.form input:focus, .form textarea:focus { outline: none; border-color: var(--accent); }
.form fieldset { border: 0; padding: 0; margin: 0; }
.form legend { font-size: 13px; color: var(--fg-2); font-weight: 500; margin-bottom: 10px; }
.pills { display: flex; flex-wrap: wrap; gap: 8px; }
.pills label { display: block; cursor: pointer; }
.pills input { position: absolute; opacity: 0; pointer-events: none; }
.pills span { display: inline-block; padding: 9px 14px; border: 1px solid var(--line-2); border-radius: 999px; font-size: 14px; color: var(--fg-2); transition: all .2s; }
.pills input:checked + span { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.pills input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 2px; }
.form .check { display: flex; gap: 10px; align-items: flex-start; font-weight: 400; font-size: 13.5px; }
.form .check input { accent-color: var(--accent); width: 18px; height: 18px; margin: 1px 0 0; flex: none; }
.form .btn { justify-self: start; }
.hp { position: absolute; left: -9999px; }
.form-msg { font-size: 14px; min-height: 1.4em; }
.form-msg.ok { color: var(--accent); }
.form-msg.err { color: var(--str); }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--line); padding: 56px 0 40px; }
.foot { display: grid; grid-template-columns: 1.2fr 1fr 1.4fr auto; gap: 32px; align-items: start; }
.foot .logo { margin-bottom: 12px; }
.foot-links { display: grid; gap: 8px; color: var(--fg-2); }
.foot-links a:hover { color: var(--fg); }

/* ---------- Reveal on scroll ---------- */
.js .reveal { opacity: 0; transform: translateY(24px); transition: opacity .9s var(--ease), transform .9s var(--ease); }
.js .reveal.in { opacity: 1; transform: none; }

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 1080px) {
  .sessions { grid-template-columns: repeat(2, 1fr); }
  .papers { grid-template-columns: repeat(2, 1fr); }
  .paper-card.feature { grid-column: span 2; }
  .foot { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 900px) {
  .nav-links {
    position: fixed; inset: 72px 0 auto 0; flex-direction: column; gap: 0;
    background: var(--ink); border-bottom: 1px solid var(--line); padding: 8px var(--gutter) 20px;
    transform: translateY(-8px); opacity: 0; pointer-events: none; transition: all .3s var(--ease);
  }
  .nav-links.open { transform: none; opacity: 1; pointer-events: auto; }
  .nav-links a { padding: 16px 0; border-bottom: 1px solid var(--line); font-size: 20px; color: var(--fg); }
  .nav-toggle { display: block; }
  .nav-right .btn { display: none; }
  .hero-grid, .lab-grid, .join-grid { grid-template-columns: 1fr; }
  .pillars { grid-template-columns: 1fr; }
  .pillar { min-height: 340px; }
  .protocols { grid-template-columns: 1fr; }
  .loop-steps { grid-template-columns: 1fr 1fr; }
  .loop-steps li:nth-child(3) { border-left: 0; padding-left: 0; }
  .loop-steps li { padding-bottom: 28px; }
  .paper-card.feature { display: flex; }
}
@media (max-width: 640px) {
  body { font-size: 16px; }
  .papers, .sessions { grid-template-columns: 1fr; }
  .paper-card.feature { grid-column: auto; padding: 26px; }
  .loop-steps { grid-template-columns: 1fr; }
  .loop-steps li, .loop-steps li + li { border-left: 0; padding-left: 0; border-bottom: 1px solid var(--line); }
  .form .row { grid-template-columns: 1fr; }
  .spec dl div { grid-template-columns: 1fr; gap: 4px; }
  .manifesto li { grid-template-columns: 1fr; gap: 8px; }
  .session { min-height: 0; }
  .session h3 { padding-top: 40px; }
  .foot { grid-template-columns: 1fr; }
  .chart .gap-label { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .js .reveal { opacity: 1; transform: none; }
  .js .chart .line-trained, .js .chart .line-untrained { stroke-dashoffset: 0; }
  .js .chart .line-untrained { stroke-dasharray: 2 7; }
  .js .chart .area, .js .chart .lbl, .js .chart .gap, .js .chart .gap-label, .js .chart circle { opacity: 1; }
}