/* Volatility Insights - shared stylesheet.
   Single source of truth for every page. Edit colours in :root. */

:root {
  /* Palette sampled from the Volatility Insights badge:
     navy field, light-cyan ring and wireframe, coral ridge lines. */
  --bg:        #06111c;
  --panel:     #0c1c2b;
  --panel-2:   #102435;
  --text:      #e4eef5;
  --muted:     #8ba6bb;
  --dim:       #5f7a90;
  --line:      #22394d;
  --line-soft: #15293a;
  --accent:    #7fd4e8;
  --accent-2:  #f0895c;
  --accent-3:  #a8cfe8;
  --mono: ui-monospace, "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --maxw: 1080px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.7 var(--sans);
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code, .mono { font-family: var(--mono); }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 30;
  background: rgba(6,17,28,.80);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line-soft);
}
.nav .wrap { display: flex; align-items: center; gap: 26px; height: 64px; }
.brand {
  display: flex; align-items: center; gap: 16px;
  font-family: var(--mono); font-size: .8rem; letter-spacing: .15em;
  text-transform: uppercase; color: var(--text); white-space: nowrap;
}
/* translateY is half the nav height, so the header rule bisects the badge */
.brand img {
  width: 76px; height: 76px; border-radius: 50%; display: block; flex: none;
  transform: translateY(32px);
  background: var(--bg);
  box-shadow: 0 0 0 1px var(--line), 0 0 22px rgba(127,212,232,.22);
}
.brand span { color: var(--accent); }
.nav nav { margin-left: auto; display: flex; gap: 20px; }
.nav nav a {
  font-family: var(--mono); font-size: .74rem; letter-spacing: .11em;
  text-transform: uppercase; color: var(--muted);
}
.nav nav a:hover { color: var(--text); text-decoration: none; }

/* ---------- hero ---------- */
.hero { position: relative; overflow: hidden; border-bottom: 1px solid var(--line-soft); min-height: 86vh; display: flex; align-items: center; }
#surface { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.veil {
  position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(100% 78% at 8% 20%, rgba(6,17,28,.96) 0%, rgba(6,17,28,.76) 36%, rgba(6,17,28,.14) 100%),
    linear-gradient(180deg, rgba(6,17,28,.58) 0%, rgba(6,17,28,0) 26%, rgba(6,17,28,0) 74%, rgba(6,17,28,.52) 100%);
}
.hero .wrap { position: relative; width: 100%; padding: 118px 28px 104px; }
.eyebrow {
  font-family: var(--mono); font-size: .73rem; letter-spacing: .24em;
  text-transform: uppercase; color: var(--accent); margin: 0 0 20px;
}
h1 {
  font-size: clamp(2.3rem, 6.2vw, 4.05rem); line-height: 1.03;
  letter-spacing: -.032em; margin: 0 0 22px; font-weight: 600;
}
.lead { font-size: 1.17rem; color: var(--muted); max-width: 58ch; margin: 0 0 34px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-block; padding: 12px 22px; border-radius: 7px;
  font-family: var(--mono); font-size: .8rem; letter-spacing: .07em;
  text-transform: uppercase; font-weight: 600; border: 1px solid transparent;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--accent); color: #05161f; }
.btn-primary:hover { filter: brightness(1.12); }
.btn-ghost { border-color: var(--line); color: var(--text); background: rgba(255,255,255,.02); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- sections ---------- */
section { padding: 84px 0; border-bottom: 1px solid var(--line-soft); }
.sec-label {
  font-family: var(--mono); font-size: .72rem; letter-spacing: .22em;
  text-transform: uppercase; color: var(--dim); margin: 0 0 14px;
}
h2 { font-size: clamp(1.5rem, 3vw, 2rem); letter-spacing: -.02em; margin: 0 0 18px; font-weight: 600; }
h3 { font-size: 1.02rem; margin: 0 0 9px; font-weight: 600; }
.sec-intro { color: var(--muted); max-width: 62ch; margin: 0 0 40px; }

/* ---------- cards ---------- */
.grid { display: grid; gap: 16px; }
.g3 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.g2 { grid-template-columns: repeat(auto-fit, minmax(310px, 1fr)); }
.card {
  background: var(--panel); border: 1px solid var(--line-soft);
  border-radius: 10px; padding: 24px; transition: border-color .18s, transform .18s;
}
.card:hover { border-color: var(--line); transform: translateY(-2px); }
.card p { margin: 0; color: var(--muted); font-size: .94rem; }
.card .num {
  font-family: var(--mono); font-size: .72rem; letter-spacing: .14em;
  color: var(--accent); display: block; margin-bottom: 12px;
}

/* ---------- model zoo ---------- */
.zoo { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(290px, 1fr)); }
.fam {
  background: var(--panel); border: 1px solid var(--line-soft);
  border-left: 2px solid var(--accent); border-radius: 8px; padding: 22px;
}
.fam:nth-child(2) { border-left-color: var(--accent-2); }
.fam:nth-child(3) { border-left-color: var(--accent-3); }
.fam:nth-child(4) { border-left-color: var(--accent-3); }
.fam h3 { margin-bottom: 6px; }
.fam .sub { font-family: var(--mono); font-size: .72rem; color: var(--dim); margin: 0 0 16px; }
.fam ul { list-style: none; margin: 0; padding: 0; }
.fam li {
  font-family: var(--mono); font-size: .8rem; color: var(--muted);
  padding: 6px 0; border-top: 1px solid var(--line-soft);
}
.fam li:first-child { border-top: 0; }
.fam li b { color: var(--text); font-weight: 600; }
.fam li i { font-style: normal; color: var(--dim); }

/* ---------- notes list ---------- */
.notes { display: grid; gap: 2px; }
.note {
  display: block; padding: 24px 0; border-top: 1px solid var(--line-soft);
  color: inherit;
}
.note:hover { text-decoration: none; }
.note:hover h3 { color: var(--accent); }
.note-meta {
  font-family: var(--mono); font-size: .72rem; letter-spacing: .1em;
  text-transform: uppercase; color: var(--dim); margin-bottom: 10px;
  display: flex; gap: 14px; flex-wrap: wrap;
}
.note-meta .tag { color: var(--accent-2); }
.note h3 { font-size: 1.16rem; transition: color .15s; }
.note p { margin: 0; color: var(--muted); font-size: .95rem; max-width: 70ch; }

/* ---------- youtube ---------- */
.yt-track { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.rung {
  background: var(--panel); border: 1px solid var(--line-soft);
  border-radius: 10px; padding: 22px; position: relative;
}
.rung .level {
  font-family: var(--mono); font-size: .68rem; letter-spacing: .16em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 12px; display: block;
}
.rung ul { margin: 0; padding-left: 17px; color: var(--muted); font-size: .9rem; }
.rung li { margin: 5px 0; }

/* ---------- article body ---------- */
.article { padding: 64px 0 88px; }
.article .wrap { max-width: 720px; }
.article h1 { font-size: clamp(1.9rem, 4.4vw, 2.7rem); margin-bottom: 18px; }
.article h2 { margin: 52px 0 14px; font-size: 1.35rem; }
.article h3 { margin: 34px 0 10px; font-size: 1.05rem; }
.article p { color: #c6d6e2; margin: 0 0 18px; }
.article ul, .article ol { color: #c6d6e2; padding-left: 22px; margin: 0 0 18px; }
.article li { margin: 7px 0; }
.article strong { color: var(--text); }
.kicker {
  font-family: var(--mono); font-size: .74rem; letter-spacing: .14em;
  text-transform: uppercase; color: var(--dim); margin: 0 0 16px;
  display: flex; gap: 14px; flex-wrap: wrap;
}
.kicker .tag { color: var(--accent-2); }
.standfirst {
  font-size: 1.12rem; color: var(--muted); border-left: 2px solid var(--accent);
  padding-left: 18px; margin: 0 0 40px;
}
.eq {
  font-family: var(--mono); font-size: .88rem; color: var(--accent);
  background: var(--panel); border: 1px solid var(--line-soft);
  border-radius: 8px; padding: 18px 20px; margin: 0 0 20px; overflow-x: auto;
}
.eq .note { display: block; color: var(--dim); font-size: .78rem; margin-top: 9px; }
.callout {
  background: var(--panel-2); border: 1px solid var(--line-soft);
  border-left: 2px solid var(--accent-2);
  border-radius: 8px; padding: 20px 22px; margin: 0 0 22px;
}
.callout p:last-child { margin-bottom: 0; }
.article code {
  font-size: .88em; color: var(--accent); background: var(--panel);
  border: 1px solid var(--line-soft); border-radius: 4px; padding: 1px 5px;
}
.article em, .refs em { color: var(--accent-3); font-style: normal; }
.refs { font-size: .86rem; color: var(--dim); }
.refs li { margin: 9px 0; }
.back {
  font-family: var(--mono); font-size: .76rem; letter-spacing: .1em;
  text-transform: uppercase; color: var(--muted); display: inline-block; margin-bottom: 30px;
}
.back:hover { color: var(--accent); }

/* ---------- footer ---------- */
footer { padding: 46px 0 60px; color: var(--dim); font-size: .88rem; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; }
footer .links { margin-left: auto; display: flex; gap: 20px; }
footer a { color: var(--muted); }

@media (max-width: 620px) {
  .hero .wrap { padding: 78px 24px 72px; }
  section { padding: 60px 0; }
  .nav nav { gap: 14px; }
  .nav nav a { font-size: .68rem; }
  .brand { gap: 11px; font-size: .72rem; }
  .brand img { width: 54px; height: 54px; }
}