:root {
  --bg: #0b0d10;
  --bg-elev: #11141a;
  --line: #1c2230;
  --ink: #e7eaf0;
  --ink-mute: #9aa3b2;
  --ink-soft: #6b7283;
  --accent: #63e6be;
  --accent-2: #8ab4ff;
  --warn: #ffb86b;
  --max: 980px;
  --r-sm: 10px;
  --r-md: 14px;
  --r-lg: 20px;
  --shadow: 0 1px 0 rgba(255,255,255,.04) inset, 0 20px 40px -20px rgba(0,0,0,.6);
  --font: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  background-image:
    radial-gradient(1200px 600px at 80% -10%, rgba(99,230,190,.06), transparent 60%),
    radial-gradient(900px 500px at -10% 30%, rgba(138,180,255,.05), transparent 55%);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  line-height: 1.6;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { color: var(--accent); }

/* ---------- nav ---------- */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max);
  margin: 0 auto;
  padding: 22px 24px;
}
.nav nav { display: flex; gap: 22px; }
.nav nav a {
  color: var(--ink-mute);
  font-size: 14px;
  font-weight: 500;
}
.nav nav a:hover { color: var(--ink); }
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: .02em;
}
.brand-text { font-weight: 500; }
.dot {
  width: 10px; height: 10px; border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(99,230,190,.12);
}

/* ---------- hero ---------- */
main { max-width: var(--max); margin: 0 auto; padding: 0 24px 80px; }
.hero { padding: 64px 0 48px; }
.kicker {
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: .14em;
  font-size: 12px;
  color: var(--ink-soft);
  margin: 0 0 18px;
}
h1 {
  font-size: clamp(34px, 5.4vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 22px;
  font-weight: 600;
  max-width: 22ch;
}
h1 em {
  font-style: normal;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lede {
  font-size: clamp(16px, 1.6vw, 19px);
  color: var(--ink-mute);
  max-width: 62ch;
  margin: 0 0 30px;
}
.cta { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border-radius: var(--r-sm);
  font-weight: 500;
  font-size: 15px;
  border: 1px solid transparent;
  transition: transform .12s ease, border-color .12s ease, background .12s ease, color .12s ease;
}
.btn.primary {
  background: var(--ink);
  color: var(--bg);
}
.btn.primary:hover { transform: translateY(-1px); background: #fff; }
.btn.ghost {
  border-color: var(--line);
  color: var(--ink);
}
.btn.ghost:hover { border-color: #2c344a; }

/* ---------- sections ---------- */
.section { padding: 56px 0; border-top: 1px solid var(--line); }
.section-title {
  font-size: 13px;
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: .18em;
  color: var(--ink-soft);
  margin: 0 0 28px;
  font-weight: 500;
}
h2 { font-weight: 500; }
h3 { font-size: 17px; margin: 0 0 8px; font-weight: 600; letter-spacing: -0.01em; }

/* ---------- grids ---------- */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
@media (max-width: 820px) {
  .grid-3 { grid-template-columns: 1fr; }
}
.card {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 22px;
  box-shadow: var(--shadow);
  transition: border-color .14s ease, transform .14s ease;
}
.card:hover { border-color: #2a3144; transform: translateY(-2px); }
.card p { margin: 0 0 14px; color: var(--ink-mute); font-size: 15px; }
.card .meta {
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-soft);
}

.tags {
  display: flex; flex-wrap: wrap; gap: 6px;
  list-style: none; padding: 0; margin: 0;
}
.tags li {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .04em;
  padding: 4px 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink-mute);
}

/* ---------- stack ---------- */
.stack {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
@media (max-width: 820px) { .stack { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .stack { grid-template-columns: 1fr; } }
.stack h4 {
  font-size: 12px;
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: .14em;
  color: var(--ink-soft);
  margin: 0 0 12px;
  font-weight: 500;
}
.stack ul { list-style: none; margin: 0; padding: 0; }
.stack li {
  padding: 8px 0;
  border-top: 1px dashed var(--line);
  font-size: 14px;
  color: var(--ink);
}
.stack li:first-child { border-top: 0; }

/* ---------- steps ---------- */
.steps {
  list-style: none;
  counter-reset: step;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 14px;
}
.steps li {
  counter-increment: step;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 22px 22px 22px 64px;
  position: relative;
}
.steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 22px; top: 22px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
}
.steps p { margin: 0; color: var(--ink-mute); font-size: 15px; }

/* ---------- contact ---------- */
.section-contact { text-align: left; }
.big-link {
  font-family: var(--mono);
  font-size: clamp(20px, 3vw, 28px);
  margin: 18px 0;
}
.big-link a {
  color: var(--ink);
  border-bottom: 1px dashed var(--line);
  padding-bottom: 4px;
}
.big-link a:hover { color: var(--accent); border-color: var(--accent); }
.muted { color: var(--ink-mute); }
.aside { margin-top: 18px; color: var(--ink-soft); font-size: 14px; font-style: italic; }

/* ---------- footer ---------- */
.footer {
  border-top: 1px solid var(--line);
  margin-top: 40px;
  padding: 28px 24px;
  max-width: var(--max);
  margin-left: auto;
  margin-right: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
  color: var(--ink-mute);
  font-size: 14px;
}
.footer > div { display: flex; align-items: center; gap: 10px; font-family: var(--mono); }
.footer nav { display: flex; gap: 18px; }
.footer .small { font-size: 12px; color: var(--ink-soft); }

/* ---------- privacy / doc page ---------- */
.page-doc main.doc {
  max-width: 760px;
  padding: 56px 24px 80px;
}
.doc h1 {
  font-size: clamp(32px, 4.4vw, 44px);
  letter-spacing: -0.02em;
  margin: 0 0 6px;
  font-weight: 600;
}
.doc h2 {
  font-size: 18px;
  margin: 36px 0 10px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.doc p, .doc ul { color: var(--ink-mute); }
.doc ul { padding-left: 20px; }
.doc li { margin: 8px 0; }
.doc code {
  font-family: var(--mono);
  font-size: 13px;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 1px 6px;
  color: var(--ink);
}
.doc strong { color: var(--ink); font-weight: 600; }
.back {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 14px;
}

/* ---------- light mode ---------- */
@media (prefers-color-scheme: light) {
  :root {
    --bg: #fafafa;
    --bg-elev: #ffffff;
    --line: #e6e8ee;
    --ink: #0e1219;
    --ink-mute: #4d5568;
    --ink-soft: #7a8395;
    --accent: #0fa57a;
    --accent-2: #2c64d6;
    --shadow: 0 1px 2px rgba(15,18,25,.04), 0 12px 24px -16px rgba(15,18,25,.08);
  }
  body {
    background-image:
      radial-gradient(1200px 600px at 80% -10%, rgba(15,165,122,.07), transparent 60%),
      radial-gradient(900px 500px at -10% 30%, rgba(44,100,214,.06), transparent 55%);
  }
  .btn.primary { background: var(--ink); color: #fff; }
  .btn.primary:hover { background: #000; }
}

/* ---------- focus ---------- */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

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