:root {
  color-scheme: dark;
  --bg: #101423;
  --nav: #151824;
  --panel: #191e31;
  --border: #323952;
  --text: #f6f3f5;
  --muted: #b9bed1;
  --accent: #ffb25e;
  --mono: ui-monospace, Consolas, monospace;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 1rem/1.6 system-ui, sans-serif; }
a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.skip { position: fixed; top: -5rem; left: 1rem; padding: .5rem 1rem; background: var(--accent); color: var(--bg); z-index: 2; }
.skip:focus { top: 1rem; }
.layout { display: grid; grid-template-columns: 252px minmax(0, 1fr); min-height: 100vh; }
.sidebar { background: var(--nav); border-right: 1px solid var(--border); padding: 25px 17px; display: flex; flex-direction: column; gap: 28px; }
.brand { display: flex; align-items: center; gap: 10px; padding: 0 7px; font-size: 1.25rem; font-weight: 800; letter-spacing: -.045em; }
nav { display: grid; gap: 3px; }
nav a, summary { display: block; padding: 7px 10px; border-radius: 6px; font-size: .9rem; font-weight: 600; }
summary { display: list-item; cursor: pointer; }
summary::marker { color: var(--accent); }
nav a:hover, summary:hover { background: var(--panel); }
nav a[aria-current] { color: var(--accent); background: #30283a; }
.nested { margin: 2px 0 0 13px; border-left: 1px solid var(--border); padding-left: 6px; }
.nested a { overflow-wrap: anywhere; font-size: .82rem; }
.side-note { margin: auto 7px 0; color: var(--muted); font: .73rem var(--mono); }
.stage { min-width: 0; display: flex; flex-direction: column; background: linear-gradient(180deg, #10142333, var(--bg) 920px), url("kernel-background.jpg") top right / auto clamp(540px, 65vw, 900px) no-repeat; }
main { flex: 1; }
.shell { width: min(1120px, calc(100% - 88px)); margin-inline: auto; }
.hero { display: grid; grid-template-columns: 1.2fr .8fr; align-items: center; gap: 35px; padding: 85px 0 58px; }
.eyebrow { margin: 0; color: var(--accent); font: 650 .74rem/1.5 var(--mono); letter-spacing: .12em; text-transform: uppercase; }
.eyebrow span { display: inline-block; width: 7px; height: 7px; margin-right: 5px; background: var(--accent); border-radius: 50%; }
h1, h2, h3, p { margin: 0; }
h1 { margin: 12px 0 17px; font-size: clamp(2.8rem, 5.9vw, 6.5rem); line-height: .99; letter-spacing: -.077em; }
h1 span { color: var(--accent); }
.lead { color: var(--muted); font-size: clamp(1rem, 1.6vw, 1.2rem); max-width: 47ch; }
.actions { margin-top: 25px; display: flex; gap: 10px; flex-wrap: wrap; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 10px; padding: 9px 14px; border: 1px solid var(--accent); border-radius: 6px; background: var(--accent); color: #171822; font-weight: 750; font-size: .88rem; }
.button:hover { color: #171822; background: #ffd09e; }
.button.secondary { border-color: var(--border); background: var(--panel); color: var(--text); }
.button.secondary:hover { color: var(--accent); border-color: var(--accent); }
.art { display: grid; place-items: center; min-height: 300px; border: 1px solid var(--border); border-radius: 14px; background: radial-gradient(ellipse at 66% 45%, #553652, transparent 70%), repeating-linear-gradient(0deg, transparent 0 27px, #8790ce20 27px 28px), repeating-linear-gradient(90deg, #1b2138 0 27px, #2c3351 27px 28px); }
.art-window { width: min(72%, 260px); border: 1px solid #6f6688; border-radius: 10px; background: #151829; box-shadow: 0 14px 44px #101423b0; }
.art-bar { display: flex; gap: 5px; padding: 12px; border-bottom: 1px solid var(--border); }
.art-bar i { width: 6px; height: 6px; border-radius: 50%; background: #bba8ee; }
.art-bar i:first-child, .art-code b { color: var(--accent); }
.art-bar i:first-child { background: var(--accent); }
.art-code { color: #c5b4ff; font: bold 3rem/1 var(--mono); padding: 22px 18px 26px; }
.art-timeline { display: grid; grid-template-columns: 1fr 1.5fr .8fr; gap: 5px; padding: 10px; border-top: 1px solid var(--border); }
.art-timeline i { height: 10px; background: #a899e8; border-radius: 3px; }
.art-timeline i:nth-child(2) { background: #ffb25e; }
.art-timeline i:nth-child(3) { background: #7784c4; }
.section { border-top: 1px solid var(--border); padding: 27px 0 52px; }
.section h2 { font-size: 2rem; line-height: 1.15; margin: 8px 0 18px; letter-spacing: -.045em; }
.cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.card { display: block; padding: 18px; }
.card, .channel-card, .catalog li { background: var(--panel); border: 1px solid var(--border); border-radius: 9px; }
.card:hover, .channel-card:hover { border-color: var(--accent); }
.glyph { display: inline-grid; place-items: center; width: 38px; height: 38px; border-radius: 7px; background: #30283a; color: var(--accent); font: 750 .8rem var(--mono); }
.card h3 { margin: 8px 0 3px; }
.card p, .catalog li p:not(.eyebrow) { color: var(--muted); }
.card-link, .back { display: inline-block; margin-top: 10px; color: var(--accent); font-size: .9rem; font-weight: 700; }
.page-head { padding: 64px 0 30px; }
.profile h1 { font-size: clamp(2.4rem, 5.3vw, 5.3rem); overflow-wrap: anywhere; }
.back { margin: 0 0 20px; }
.catalog, .channel-list { list-style: none; padding: 0; margin: 0 0 45px; display: grid; gap: 10px; }
.catalog li { display: flex; align-items: center; justify-content: space-between; gap: 15px; padding: 16px 18px; }
.catalog h2 { font-size: 1.24rem; margin: 2px 0; }
.catalog .button { flex: none; }
.catalog-links { display: flex; flex-wrap: wrap; gap: 8px; }
.channel-card { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: 13px; padding: 12px; overflow-wrap: anywhere; }
.footer { display: flex; justify-content: space-between; gap: 10px; padding: 17px 0; color: var(--muted); border-top: 1px solid var(--border); font-size: .8rem; }
@media (max-width: 1080px) {
  .shell { width: calc(100% - 46px); }
  .hero { gap: 18px; }
  .art { min-height: 245px; }
}
@media (max-width: 870px) {
  .layout { grid-template-columns: 205px minmax(0, 1fr); }
  .hero { grid-template-columns: 1fr; padding-top: 42px; }
}
@media (max-width: 650px) {
  .layout { display: block; }
  .sidebar { padding: 12px 14px; gap: 8px; border: 0; border-bottom: 1px solid var(--border); }
  nav { grid-template-columns: auto auto 1fr; align-items: start; }
  .nested { margin-left: 6px; }
  .side-note { display: none; }
  .shell { width: calc(100% - 32px); }
  .hero { padding: 31px 0; }
  .page-head { padding-top: 33px; }
}
@media (max-width: 470px) {
  .cards { grid-template-columns: 1fr; }
  .catalog li { align-items: flex-start; flex-direction: column; }
}

.brand img { flex: none; }
.brand { font-size: 1.05rem; }
.hero h1 { overflow-wrap: anywhere; }