/* openpromt — статический лендинг. Тёмная dev-эстетика, моноширинные акценты. */
:root {
  --bg: #0b0d10;
  --bg-soft: #12151a;
  --bg-card: #14181e;
  --line: #232a33;
  --fg: #e6e9ee;
  --fg-dim: #9aa4b2;
  --muted: #6b7484;
  --accent: #5eead4;     /* teal */
  --accent-2: #a78bfa;   /* violet */
  --radius: 14px;
  --mono: ui-monospace, "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
  --sans: ui-sans-serif, system-ui, "Segoe UI", Roboto, Inter, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    radial-gradient(900px 500px at 80% -10%, rgba(167,139,250,.10), transparent 60%),
    radial-gradient(800px 500px at 0% 0%, rgba(94,234,212,.08), transparent 55%),
    var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
main { max-width: 880px; margin: 0 auto; padding: 0 22px 80px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* header / footer */
header.site, footer.site {
  max-width: 880px; margin: 0 auto; padding: 22px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
header.site { border-bottom: 1px solid var(--line); margin-bottom: 36px; }
.brand { font-family: var(--mono); font-size: 19px; color: var(--fg); font-weight: 600; }
.brand:hover { text-decoration: none; }
.brand b { color: var(--accent); font-weight: 600; }
.brand-mark { color: var(--accent-2); margin-right: 6px; }
header.site nav { display: flex; gap: 20px; font-size: 15px; }
header.site nav a { color: var(--fg-dim); }
header.site nav a:hover { color: var(--fg); text-decoration: none; }
footer.site { border-top: 1px solid var(--line); margin-top: 64px; color: var(--muted); font-size: 14px; }
.muted { color: var(--muted); }

/* hero */
.hero { padding: 16px 0 34px; }
.hero h1 { font-size: clamp(34px, 6vw, 52px); margin: 0 0 14px; letter-spacing: -.02em; }
.lede { color: var(--fg-dim); font-size: 19px; max-width: 60ch; margin: 0; }

/* каталог */
.grid { display: grid; gap: 14px; }
.card {
  display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 20px;
  padding: 20px 22px; background: var(--bg-card); border: 1px solid var(--line);
  border-radius: var(--radius); color: var(--fg); transition: border-color .15s, transform .15s, background .15s;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); text-decoration: none; background: #161b22; }
.card-num { font-family: var(--mono); font-size: 30px; color: var(--accent-2); opacity: .85; min-width: 46px; }
.card-body h2 { margin: 0 0 4px; font-size: 21px; }
.card-body p { margin: 0; color: var(--fg-dim); font-size: 15.5px; }
.card-meta { display: flex; gap: 14px; margin-top: 8px; font-family: var(--mono); font-size: 12.5px; color: var(--muted); }
.card-arrow { font-size: 22px; color: var(--muted); transition: color .15s, transform .15s; }
.card:hover .card-arrow { color: var(--accent); transform: translateX(3px); }

/* урок */
.lesson .back { font-size: 14px; color: var(--fg-dim); }
.lesson-num, .card-num { font-family: var(--mono); }
.lesson-num { color: var(--accent); font-size: 13px; letter-spacing: .12em; text-transform: uppercase; margin-top: 18px; }
.lesson h1 { font-size: clamp(28px, 5vw, 42px); margin: 8px 0 12px; letter-spacing: -.02em; }
.lesson-meta { display: flex; gap: 16px; font-family: var(--mono); font-size: 13px; color: var(--muted); margin-bottom: 22px; }
.video { margin: 4px 0 22px; }
.video a { font-weight: 600; }

/* кнопка скачать */
.dl {
  display: inline-block; margin: 12px 0 26px; padding: 13px 22px;
  background: linear-gradient(180deg, var(--accent), #38bdf8);
  color: #062019; font-weight: 700; border-radius: 11px; font-size: 16px;
  border: 1px solid rgba(255,255,255,.15);
}
.dl:hover { text-decoration: none; filter: brightness(1.06); }

/* проза урока */
.prose { margin-top: 8px; }
.prose h1, .prose h2, .prose h3 { letter-spacing: -.01em; margin: 1.6em 0 .5em; line-height: 1.25; }
.prose h2 { font-size: 26px; padding-bottom: .25em; border-bottom: 1px solid var(--line); }
.prose h3 { font-size: 20px; color: var(--fg); }
.prose p, .prose li { color: var(--fg); }
.prose a { color: var(--accent); }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li { margin: .3em 0; }
.prose blockquote {
  margin: 1.2em 0; padding: .6em 1.1em; border-left: 3px solid var(--accent-2);
  background: var(--bg-soft); border-radius: 0 8px 8px 0; color: var(--fg-dim);
}
.prose code {
  font-family: var(--mono); font-size: .9em; background: #1b2129;
  border: 1px solid var(--line); border-radius: 6px; padding: .12em .4em; color: var(--accent);
}
.prose pre.code {
  background: #0e1217; border: 1px solid var(--line); border-radius: 12px;
  padding: 16px 18px; overflow-x: auto; margin: 1.1em 0; position: relative;
}
.prose pre.code code { background: none; border: none; padding: 0; color: #d7dde6; font-size: 14px; line-height: 1.6; }
.prose pre.code[data-lang]::before {
  content: attr(data-lang); position: absolute; top: 8px; right: 12px;
  font-family: var(--mono); font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: .08em;
}
.prose hr { border: none; border-top: 1px solid var(--line); margin: 2em 0; }

@media (max-width: 600px) {
  body { font-size: 16px; }
  .card { grid-template-columns: auto 1fr; gap: 14px; padding: 16px; }
  .card-arrow { display: none; }
}