:root {
  color-scheme: dark;
  --bg: #090b10;
  --panel: #0f131b;
  --panel-hover: #141a24;
  --text: #f3f5f7;
  --muted: #9aa4b2;
  --line: rgba(255,255,255,.10);
  --accent: #75a7ff;
  --radius: 22px;
  --shell: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 85% 5%, rgba(73,108,255,.14), transparent 28rem),
    linear-gradient(180deg, #080a0f 0%, var(--bg) 50%, #080a0f 100%);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
.shell { width: min(calc(100% - 40px), var(--shell)); margin-inline: auto; }

.site-header {
  min-height: 86px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}
.brand { font-weight: 820; letter-spacing: -.01em; }
.nav { display: flex; gap: 26px; color: var(--muted); font-size: .94rem; }
.nav a:hover { color: var(--text); }

.hero { padding: 110px 0 86px; }
.eyebrow, .direction-kicker, .section-head > span {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: .11em;
  font-size: .76rem;
  font-weight: 760;
}
.hero h1 {
  max-width: 1000px;
  margin: 20px 0 24px;
  font-size: clamp(3.4rem, 8vw, 7.2rem);
  line-height: .98;
  letter-spacing: -.035em;
}
.lead { max-width: 760px; margin: 0; color: var(--muted); font-size: clamp(1.08rem, 2vw, 1.35rem); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 38px; }
.button {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0 19px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text);
  background: rgba(255,255,255,.025);
}
.button:hover { border-color: rgba(255,255,255,.25); background: rgba(255,255,255,.06); }
.button-primary { background: var(--text); color: var(--bg); border-color: var(--text); font-weight: 730; }
.terminal {
  margin-top: 72px;
  width: fit-content;
  padding: 12px 15px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--muted);
  background: rgba(0,0,0,.28);
  font: .88rem/1.4 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.terminal span { color: #79d69d; margin-right: 8px; }
.terminal strong { color: var(--text); margin-left: 14px; font-weight: 650; }

.directions, .principles { padding: 90px 0; border-top: 1px solid var(--line); }
.section-head { display: grid; grid-template-columns: 150px 1fr; align-items: start; gap: 20px; margin-bottom: 38px; }
.section-head h2 { margin: 0; font-size: clamp(2rem, 4vw, 3.5rem); line-height: 1.05; letter-spacing: -.02em; }

.direction-list { border-top: 1px solid var(--line); }
.direction {
  --item-accent: var(--accent);
  display: grid;
  grid-template-columns: 100px 1fr 60px;
  gap: 24px;
  align-items: center;
  min-height: 190px;
  padding: 30px 0;
  border-bottom: 1px solid var(--line);
  transition: padding .2s ease, background .2s ease;
}
.direction:hover {
  padding-inline: 24px;
  background: linear-gradient(90deg, color-mix(in srgb, var(--item-accent) 9%, transparent), transparent 72%);
}
.direction-index { color: var(--muted); font: .84rem ui-monospace, SFMono-Regular, Menlo, monospace; }
.direction h3 { margin: 4px 0 8px; font-size: clamp(1.9rem, 4vw, 3.1rem); letter-spacing: -.02em; }
.direction p { max-width: 650px; margin: 0; color: var(--muted); font-size: 1.02rem; }
.direction-kicker { color: var(--item-accent); }
.direction-arrow { justify-self: end; color: var(--item-accent); font-size: 1.7rem; }
.direction-openbld { --item-accent: #61d6a0; }
.direction-checks { --item-accent: #75a7ff; }
.direction-sysconf { --item-accent: #a78bfa; }
.direction-telegram { --item-accent: #8bb2fa; }
.direction-lab { --item-accent: #f0b96d; }

.principle-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.principle-grid p {
  min-height: 150px;
  margin: 0;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  font-size: 1.15rem;
}

.site-footer {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 30px;
  padding: 34px 0 44px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .88rem;
}
.site-footer span:first-child { color: var(--text); font-weight: 760; }

@media (max-width: 760px) {
  .shell { width: min(calc(100% - 28px), var(--shell)); }
  .site-header { min-height: 72px; }
  .nav a:first-child { display: none; }
  .hero { padding: 78px 0 64px; }
  .hero h1 { font-size: clamp(3rem, 16vw, 5rem); }
  .terminal { margin-top: 48px; width: 100%; overflow: hidden; white-space: nowrap; }
  .section-head { grid-template-columns: 1fr; gap: 10px; }
  .direction { grid-template-columns: 42px 1fr 28px; gap: 12px; min-height: 175px; }
  .direction:hover { padding-inline: 10px; }
  .principle-grid { grid-template-columns: 1fr; }
  .principle-grid p { min-height: auto; }
  .site-footer { grid-template-columns: 1fr; gap: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}