/* Knode, knode.md
   Three inks, two in-house typefaces, one rule: square cells, every corner rounded by half a cell. */

@font-face { font-family: "Knode Block"; src: url("../fonts/KnodeBlock.woff2") format("woff2"); font-display: swap; }
@font-face { font-family: "Knode Line"; src: url("../fonts/KnodeLine.woff2") format("woff2"); font-display: swap; }
@font-face { font-family: "Geist"; src: url("../fonts/Geist.woff2") format("woff2"); font-weight: 100 900; font-display: swap; }
@font-face { font-family: "Geist Mono"; src: url("../fonts/GeistMono.woff2") format("woff2"); font-weight: 100 900; font-display: swap; }

:root {
  --ink: #0B0B14;
  --paper: #F3F2EE;
  --indigo: #818CF8;
  --bg: var(--ink);
  --fg: var(--paper);
  --muted: #A3A2BA;
  --line: #24243B;
  --panel: #11111C;
  --mark: var(--indigo);
  --accent: var(--indigo);
  --on-accent: var(--ink);
  color-scheme: dark;
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: var(--paper);
    --fg: var(--ink);
    --muted: #5E5D73;
    --line: #DAD8E2;
    --panel: #FFFFFF;
    --mark: var(--ink);       /* on paper the symbol is ink: indigo is never small on paper */
    --accent: var(--ink);
    --on-accent: var(--paper);
    color-scheme: light;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 400 17px/1.6 "Geist", system-ui, -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; }
code, .mono { font-family: "Geist Mono", ui-monospace, monospace; font-size: .9em; }

.wrap {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding-left: max(24px, env(safe-area-inset-left));
  padding-right: max(24px, env(safe-area-inset-right));
}

.skip { position: absolute; left: -999px; top: 8px; background: var(--accent); color: var(--on-accent); padding: 8px 12px; border-radius: 8px; z-index: 10; }
.skip:focus { left: 8px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

/* header */
.top { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding-top: 28px; padding-bottom: 28px; }
.brand { display: block; color: var(--fg); }
.brand svg { height: 26px; width: auto; }
.brand .mark { fill: var(--mark); }
.top nav, .foot nav { display: flex; gap: 28px; }
.top nav a, .foot nav a { display: inline-flex; align-items: center; gap: 8px; text-decoration: none; color: var(--muted); font-weight: 500; font-size: 15px; }
.top nav a:hover, .foot nav a:hover { color: var(--fg); }

/* hero */
.hero { position: relative; overflow: hidden; padding: clamp(48px, 10vw, 120px) 0 clamp(140px, 22vw, 260px); }
.hero .wrap { position: relative; z-index: 1; }
.kicker { margin: 0 0 24px; font: 400 15px/1.2 "Knode Line", monospace; text-transform: uppercase; letter-spacing: .02em; color: var(--accent); }
.display {
  margin: 0; font: 400 clamp(32px, 10.2vw, 116px)/1.06 "Knode Block", monospace;
  text-transform: uppercase; letter-spacing: 0; text-wrap: balance;
}
.display span { color: var(--indigo); }
@media (prefers-color-scheme: light) { .display span { color: var(--fg); background: linear-gradient(transparent 62%, var(--indigo) 62%); } }
.lead { max-width: 34em; margin: 32px 0 0; font-size: clamp(18px, 2vw, 21px); color: var(--muted); }
.lead code { color: var(--fg); }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 40px; }
.btn {
  display: inline-flex; align-items: center; gap: 10px; min-height: 48px; padding: 0 22px; border-radius: 12px;
  border: 1px solid var(--line); text-decoration: none; font-weight: 600; font-size: 16px; color: var(--fg);
  transition: border-color .15s, transform .15s;
}
.btn:hover { border-color: var(--muted); }
.btn-ic { width: 18px; height: 18px; flex: none; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.btn-primary:hover { border-color: var(--accent); filter: brightness(1.06); }
.field { position: absolute; left: 0; right: 0; bottom: -2px; width: 100%; height: clamp(120px, 20vw, 260px); object-fit: cover; object-position: center top; opacity: .12; pointer-events: none; }
@media (prefers-color-scheme: light) { .field { opacity: .22; } }
.hero-404 { padding-bottom: clamp(80px, 14vw, 160px); }

/* sections */
.section { padding-top: clamp(64px, 9vw, 112px); }
.label { margin: 0 0 32px; font: 400 15px/1 "Knode Line", monospace; text-transform: uppercase; color: var(--muted); letter-spacing: 0; }
.principles { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); gap: 16px; }
.principles li { background: var(--panel); border: 1px solid var(--line); border-radius: 18px; padding: 28px; }
.principles .ic { width: 28px; height: 28px; color: var(--indigo); }
@media (prefers-color-scheme: light) { .principles .ic { color: var(--fg); } }
.principles h3 { margin: 22px 0 8px; font: 400 26px/1 "Knode Block", monospace; text-transform: uppercase; }
.principles p { margin: 0; color: var(--muted); }
.statement { max-width: 24em; margin: 0; font-size: clamp(24px, 3.4vw, 36px); line-height: 1.25; font-weight: 500; letter-spacing: -.01em; text-wrap: balance; }
.repos { list-style: none; margin: 40px 0 0; padding: 0; border-top: 1px solid var(--line); }
.repos a { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; padding: 20px 0; border-bottom: 1px solid var(--line); text-decoration: none; }
.nav-ic { width: 14px; height: 14px; flex: none; }
.repo-ic { width: 14px; height: 14px; flex: none; color: var(--muted); }
.repos .repo { display: inline-flex; align-items: center; gap: 10px; font-family: "Geist Mono", ui-monospace, monospace; font-weight: 500; }
.repos .what { color: var(--muted); }
.repos a:hover .repo { color: var(--indigo); }
@media (prefers-color-scheme: light) { .repos a:hover .repo { color: var(--fg); text-decoration: underline; text-decoration-color: var(--indigo); text-underline-offset: 4px; } }

/* footer */
.foot {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 20px;
  margin-top: clamp(80px, 12vw, 140px); padding-top: 32px; padding-bottom: max(40px, env(safe-area-inset-bottom));
  border-top: 1px solid var(--line); color: var(--muted); font-size: 14px;
}
.foot .brand svg { height: 18px; }
.foot p { margin: 0; }
.legal { display: flex; flex-wrap: wrap; gap: 6px 20px; }

@media (max-width: 560px) {
  .top nav { gap: 18px; }
  .brand svg { height: 22px; }
  .foot { flex-direction: column; align-items: flex-start; }
}
@media (prefers-reduced-motion: reduce) { .btn { transition: none; } }