:root {
  --bg: #0b0f14;
  --panel: #111821;
  --line: #1f2a37;
  --text: #e6edf3;
  --muted: #8b98a8;
  --accent: #3ee6b0;
  --accent-ink: #04130d;
  --err: #ff7a7a;
  --font: "Heebo", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 17px/1.65 var(--font);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
.mono { font-family: var(--mono); }

.bg {
  position: fixed; inset: 0; z-index: -1;
  background:
    radial-gradient(600px 400px at 85% -5%, rgba(62, 230, 176, .14), transparent 70%),
    radial-gradient(500px 400px at 5% 30%, rgba(80, 130, 255, .10), transparent 70%),
    linear-gradient(var(--line) 1px, transparent 1px) 0 0 / 56px 56px,
    linear-gradient(90deg, var(--line) 1px, transparent 1px) 0 0 / 56px 56px;
  -webkit-mask-image: linear-gradient(#000 40%, transparent);
  mask-image: linear-gradient(#000 40%, transparent);
  opacity: .55;
}

.top, main, .foot { width: min(1040px, 100% - 32px); margin-inline: auto; }

.top {
  display: flex; align-items: center; justify-content: space-between;
  padding-block: 22px;
}
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--mono); font-weight: 500; }
.brand-mark { color: var(--accent); }
.nav { display: flex; align-items: center; gap: 22px; color: var(--muted); font-size: 15px; }
.nav a:hover { color: var(--text); }
.lang {
  font: 500 14px var(--font); color: var(--text);
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 999px; padding: 6px 14px; cursor: pointer;
}
.lang:hover { border-color: var(--accent); }

.hero { padding-block: clamp(72px, 14vh, 150px) clamp(56px, 10vh, 100px); }
.eyebrow { color: var(--accent); font-size: 14px; margin: 0 0 14px; }
.eyebrow::before { content: "> "; }
h1 {
  margin: 0; font-weight: 700; letter-spacing: -.02em; line-height: 1.05;
  font-size: clamp(44px, 9vw, 92px);
}
.tagline { max-width: 34ch; margin: 22px 0 34px; color: var(--muted); font-size: clamp(19px, 2.6vw, 24px); line-height: 1.45; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; }

.btn {
  font: 500 16px var(--font); color: var(--text); cursor: pointer;
  background: transparent; border: 1px solid var(--line);
  padding: 12px 22px; border-radius: 10px;
  transition: border-color .15s, background .15s, transform .15s;
}
.btn:hover { border-color: var(--accent); transform: translateY(-1px); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 700; }
.btn.primary:hover { background: #5af0c0; }
.btn.wide { width: 100%; }
.btn:disabled { opacity: .6; cursor: progress; transform: none; }

.section { padding-block: 56px; }
h2 { font-size: 15px; font-weight: 500; color: var(--muted); margin: 0 0 26px; letter-spacing: .02em; }
.hash { color: var(--accent); }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; }
.card {
  position: relative; display: block; padding: 24px;
  background: linear-gradient(180deg, var(--panel), rgba(17, 24, 33, .6));
  border: 1px solid var(--line); border-radius: 14px;
  transition: border-color .2s, transform .2s, box-shadow .2s;
}
.card:hover { border-color: var(--accent); transform: translateY(-3px); box-shadow: 0 12px 40px -18px rgba(62, 230, 176, .45); }
.card h3 { margin: 12px 0 8px; font-size: 22px; letter-spacing: -.01em; }
.card p { margin: 0; color: var(--muted); font-size: 16px; }
.tag { display: block; font-size: 12px; color: var(--accent); direction: ltr; text-align: start; overflow-wrap: anywhere; }
.go { position: absolute; inset-block-start: 20px; inset-inline-end: 22px; color: var(--muted); font-size: 18px; transition: color .2s, transform .2s; }
.card:hover .go { color: var(--accent); transform: translate(2px, -2px); }
[dir="rtl"] .go { transform: scaleX(-1); }
[dir="rtl"] .card:hover .go { transform: scaleX(-1) translate(2px, -2px); }

.about .lead { max-width: 60ch; font-size: clamp(19px, 2.4vw, 23px); line-height: 1.6; margin: 0 0 28px; }

.foot {
  display: flex; justify-content: space-between; gap: 16px;
  padding-block: 40px 48px; margin-top: 40px; border-top: 1px solid var(--line);
  color: var(--muted); font-size: 14px;
}
.foot a:hover { color: var(--accent); }

dialog {
  width: min(460px, calc(100% - 32px)); padding: 0; color: var(--text);
  background: var(--panel); border: 1px solid var(--line); border-radius: 16px;
}
dialog::backdrop { background: rgba(4, 7, 10, .72); backdrop-filter: blur(4px); }
dialog form { padding: 24px; display: grid; gap: 16px; }
.dlg-head { display: flex; align-items: center; justify-content: space-between; }
.dlg-head h2 { margin: 0; font-size: 22px; color: var(--text); font-weight: 700; letter-spacing: 0; }
.x { background: none; border: 0; color: var(--muted); font-size: 28px; line-height: 1; cursor: pointer; }
.x:hover { color: var(--text); }
label span { display: block; margin-bottom: 6px; font-size: 14px; color: var(--muted); }
label em { font-style: normal; opacity: .7; }
input, textarea {
  width: 100%; font: 400 16px var(--font); color: var(--text);
  background: var(--bg); border: 1px solid var(--line); border-radius: 10px; padding: 11px 14px;
}
input:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: transparent; }
textarea { resize: vertical; min-height: 110px; }
.hp { position: absolute; inset-inline-start: -9999px; width: 1px; height: 1px; opacity: 0; }
.status { margin: 0; min-height: 1.4em; font-size: 15px; }
.status.ok { color: var(--accent); }
.status.err { color: var(--err); }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .card, .btn { transition: none; }
}

@media (max-width: 520px) {
  .nav a { display: none; }
  .foot { flex-direction: column; }
}

[dir="rtl"] .tag { text-align: right; unicode-bidi: plaintext; direction: ltr; }

/* Library platform group */
.grid { grid-template-columns: repeat(2, 1fr); }
.card.group { grid-column: 1 / -1; }
.subs { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px; margin-top: 20px; }
.sub {
  position: relative; display: block; padding: 16px 18px;
  background: var(--bg); border: 1px solid var(--line); border-radius: 10px;
  transition: border-color .2s, transform .2s;
}
.sub:hover { border-color: var(--accent); transform: translateY(-2px); }
.sub:hover .go { color: var(--accent); }
.sub-name { display: block; font-weight: 500; font-size: 18px; margin-bottom: 2px; }
.sub .go { inset-block-start: 14px; inset-inline-end: 16px; }
.card.group:hover { border-color: var(--line); transform: none; box-shadow: none; }
@media (max-width: 680px) { .grid { grid-template-columns: 1fr; } }