:root {
  --bg: #070912;
  --bg-2: #0c1020;
  --panel: rgba(20, 24, 44, 0.66);
  --panel-solid: #12162a;
  --line: rgba(160, 175, 255, 0.12);
  --line-strong: rgba(160, 175, 255, 0.24);
  --text: #e8ebf7;
  --muted: #9aa3c2;
  --faint: #6b7394;
  --accent: #89b4fa;
  --accent-2: #b4befe;
  --moon: #f9e2af;
  --moon-deep: #e8c77f;
  --radius: 16px;
  --max: 1160px;
  --font: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --display: "Space Grotesk", var(--font);
  --mono: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: radial-gradient(1200px 700px at 80% -10%, #1a1f45 0%, transparent 60%),
              radial-gradient(900px 600px at -10% 30%, #12183a 0%, transparent 60%),
              var(--bg);
  color: var(--text);
  font: 400 17px/1.65 var(--font);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-2); }
code { font-family: var(--mono); font-size: .88em; background: rgba(137, 180, 250, .1); padding: .1em .4em; border-radius: 6px; color: var(--accent-2); }
kbd { font-family: var(--font); font-weight: 600; font-size: .85em; padding: .15em .55em; border-radius: 7px; background: var(--accent); color: #0b0f1e; white-space: nowrap; }

/* ---------- sky ---------- */
#stars { position: fixed; inset: 0; width: 100%; height: 100%; z-index: -2; pointer-events: none; }
.moon {
  position: absolute; z-index: -1; pointer-events: none;
  top: -180px; right: -140px; width: 520px; height: 520px; border-radius: 50%;
  background:
    radial-gradient(circle at 30% 35%, rgba(0,0,0,.10) 0 7%, transparent 7.5%),
    radial-gradient(circle at 62% 58%, rgba(0,0,0,.08) 0 10%, transparent 10.5%),
    radial-gradient(circle at 44% 72%, rgba(0,0,0,.07) 0 5%, transparent 5.5%),
    radial-gradient(circle at 72% 30%, rgba(0,0,0,.06) 0 4%, transparent 4.5%),
    radial-gradient(circle at 35% 30%, #fff6dc 0%, var(--moon) 45%, var(--moon-deep) 80%, #b8955a 100%);
  box-shadow: 0 0 120px 30px rgba(249, 226, 175, .16), 0 0 300px 80px rgba(137, 180, 250, .08);
  opacity: .9;
  mask-image: radial-gradient(circle at 75% 25%, #000 52%, transparent 72%);
  -webkit-mask-image: radial-gradient(circle at 75% 25%, #000 52%, transparent 72%);
}

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; gap: 24px;
  padding: 14px max(24px, calc((100% - var(--max)) / 2 + 24px));
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  background: linear-gradient(to bottom, rgba(7, 9, 18, .85), rgba(7, 9, 18, .55));
  border-bottom: 1px solid transparent;
  transition: border-color .2s;
}
.nav.scrolled { border-bottom-color: var(--line); }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font: 600 18px var(--display); letter-spacing: -.01em; }
.brand:hover { color: var(--text); }
.brand img { border-radius: 8px; }
.nav-links { display: flex; gap: 26px; margin-left: auto; }
.nav-links a { color: var(--muted); font-size: 15px; font-weight: 500; }
.nav-links a:hover { color: var(--text); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  padding: 14px 24px; border-radius: 12px;
  font: 600 16px var(--font); cursor: pointer; border: 1px solid transparent;
  transition: transform .15s ease, box-shadow .2s ease, background .2s, border-color .2s;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: linear-gradient(135deg, #a5c4ff, var(--accent) 50%, #7aa2f7);
  color: #0a0e1c;
  box-shadow: 0 8px 30px -8px rgba(137, 180, 250, .6), inset 0 1px 0 rgba(255, 255, 255, .4);
}
.btn-primary:hover { color: #0a0e1c; transform: translateY(-1px); box-shadow: 0 14px 40px -10px rgba(137, 180, 250, .8), inset 0 1px 0 rgba(255, 255, 255, .4); }
.btn-ghost { color: var(--text); border-color: var(--line-strong); background: rgba(255, 255, 255, .03); }
.btn-ghost:hover { color: var(--text); border-color: var(--accent); background: rgba(137, 180, 250, .08); }
.btn-small { padding: 9px 16px; font-size: 14px; border-radius: 10px; background: rgba(137, 180, 250, .12); color: var(--accent-2); border-color: rgba(137, 180, 250, .3); }
.btn-small:hover { background: rgba(137, 180, 250, .2); color: var(--text); }
.btn-block { width: 100%; }

/* ---------- hero ---------- */
.hero { max-width: var(--max); margin: 0 auto; padding: 88px 24px 40px; text-align: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px; margin: 0 0 28px;
  padding: 7px 16px; border: 1px solid var(--line-strong); border-radius: 999px;
  background: rgba(20, 24, 44, .6); color: var(--muted); font-size: 14px; font-weight: 500;
}
.dot { width: 8px; height: 8px; border-radius: 50%; background: #a6e3a1; box-shadow: 0 0 12px #a6e3a1; }
h1, h2, h3 { font-family: var(--display); letter-spacing: -.02em; line-height: 1.1; margin: 0; }
h1 { font-size: clamp(40px, 6.6vw, 76px); font-weight: 700; }
.glow {
  background: linear-gradient(100deg, var(--moon) 0%, #f5c2e7 45%, var(--accent) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lead { max-width: 660px; margin: 26px auto 0; color: var(--muted); font-size: clamp(17px, 2vw, 20px); }
.cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-top: 36px; }
.hint { color: var(--faint); font-size: 14px; margin: 18px 0 0; }

.hero-shot { margin: 72px auto 0; position: relative; }
.hero-shot::before {
  content: ""; position: absolute; inset: 8% 6% -4%; z-index: -1;
  background: radial-gradient(closest-side, rgba(137, 180, 250, .35), transparent);
  filter: blur(40px);
}
.window {
  border-radius: 14px; overflow: hidden;
  border: 1px solid var(--line-strong);
  box-shadow: 0 40px 100px -30px rgba(0, 0, 0, .8), 0 0 0 1px rgba(0, 0, 0, .4);
  background: var(--panel-solid);
}
figcaption { color: var(--faint); font-size: 14px; margin-top: 16px; text-align: center; }

/* ---------- stats ---------- */
.stats {
  max-width: var(--max); margin: 56px auto 0; padding: 0 24px;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
}
.stats div {
  padding: 22px; border-radius: var(--radius); text-align: center;
  background: var(--panel); border: 1px solid var(--line);
}
.stats strong { display: block; font: 700 40px var(--display); color: var(--moon); letter-spacing: -.02em; }
.stats span { color: var(--muted); font-size: 15px; }

/* ---------- sections ---------- */
.section { max-width: var(--max); margin: 0 auto; padding: 120px 24px 0; }
.kicker { margin: 0 0 14px; color: var(--accent); font: 600 13px var(--mono); text-transform: uppercase; letter-spacing: .14em; }
h2 { font-size: clamp(30px, 4.4vw, 48px); font-weight: 700; max-width: 760px; }
.section-lead { color: var(--muted); max-width: 640px; margin: 18px 0 0; font-size: 18px; }
.center { text-align: center; }
.small { font-size: 14px; color: var(--muted); }

/* ---------- feature grid ---------- */
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; margin-top: 52px; }
.card {
  position: relative; padding: 28px; border-radius: var(--radius);
  background: var(--panel); border: 1px solid var(--line);
  transition: border-color .25s, transform .25s, background .25s;
}
.card:hover { border-color: var(--line-strong); transform: translateY(-3px); background: rgba(24, 29, 54, .75); }
.card h3 { font-size: 20px; margin: 18px 0 10px; }
.card p { color: var(--muted); margin: 0; font-size: 15.5px; }
.icon {
  width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center;
  background: linear-gradient(140deg, rgba(137, 180, 250, .22), rgba(203, 166, 247, .14));
  border: 1px solid rgba(137, 180, 250, .25);
}
.icon svg { width: 22px; height: 22px; fill: none; stroke: var(--accent-2); stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }

/* ---------- tour ---------- */
.tabs { display: flex; flex-wrap: wrap; gap: 8px; margin: 36px 0 28px; }
.tabs button {
  padding: 10px 18px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--line-strong); background: transparent; color: var(--muted);
  font: 500 15px var(--font); transition: all .2s;
}
.tabs button:hover { color: var(--text); border-color: var(--accent); }
.tabs button[aria-selected="true"] { background: var(--accent); color: #0a0e1c; border-color: var(--accent); }
.tour-shot img { transition: opacity .25s ease; }
.tour-shot img.fading { opacity: 0; }
.tour-shot .window { background: var(--panel-solid); display: grid; place-items: center; }

/* ---------- steps ---------- */
.steps { list-style: none; padding: 0; margin: 48px 0 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; counter-reset: s; }
.steps li { padding: 28px; border-radius: var(--radius); border: 1px solid var(--line); background: var(--panel); position: relative; overflow: hidden; }
.steps li::after { content: ""; position: absolute; left: 28px; right: 28px; top: 0; height: 2px; background: linear-gradient(90deg, var(--moon), transparent); opacity: .7; }
.step-n { font: 600 14px var(--mono); color: var(--moon); }
.steps h3 { font-size: 22px; margin: 10px 0 8px; }
.steps p { color: var(--muted); margin: 0; font-size: 15.5px; }

.code {
  margin: 28px 0 0; padding: 22px 26px; border-radius: 14px; overflow-x: auto;
  background: #0b0e1b; border: 1px solid var(--line);
  font: 15px/1.75 var(--mono); color: var(--text);
}
.code code { background: none; padding: 0; color: inherit; font-size: inherit; }
.code .c { color: var(--faint); }
.code .s { color: #a6e3a1; }
.code .f { color: var(--accent); }
.code-small { font-size: 13px; padding: 16px 18px; margin: 0 0 14px; }

/* ---------- about ---------- */
.about { display: grid; grid-template-columns: 1.4fr 1fr; gap: 56px; align-items: center; }
.about-text p { color: var(--muted); font-size: 17.5px; margin: 20px 0 0; }
.about-text h2 { margin-bottom: 4px; }
.signature { color: var(--text) !important; font-weight: 500; }
.about-card {
  padding: 36px; border-radius: 22px; text-align: center;
  background: radial-gradient(circle at 50% 0%, rgba(249, 226, 175, .12), transparent 60%), var(--panel);
  border: 1px solid var(--line-strong);
}
.about-card img { margin: 0 auto 24px; border-radius: 28px; box-shadow: 0 20px 60px -15px rgba(249, 226, 175, .35); }
.about-card dl { margin: 0; text-align: left; }
.about-card dl div { display: flex; justify-content: space-between; gap: 16px; padding: 12px 0; border-top: 1px solid var(--line); font-size: 15px; }
.about-card dt { color: var(--faint); }
.about-card dd { margin: 0; color: var(--text); text-align: right; }

/* ---------- downloads ---------- */
.downloads { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; margin: 48px 0 28px; }
.dl {
  display: flex; flex-direction: column; gap: 18px; min-width: 0;
  padding: 28px; border-radius: var(--radius); background: var(--panel); border: 1px solid var(--line);
}
.dl.recommended { border-color: rgba(137, 180, 250, .55); box-shadow: 0 0 0 1px rgba(137, 180, 250, .25), 0 20px 60px -25px rgba(137, 180, 250, .5); }
.dl.recommended .dl-head h3::after { content: "Your system"; margin-left: 10px; padding: 3px 9px; border-radius: 999px; background: rgba(166, 227, 161, .14); color: #a6e3a1; font: 600 11px var(--font); letter-spacing: .02em; vertical-align: middle; }
.dl-head { display: flex; align-items: center; gap: 14px; }
.dl-head h3 { font-size: 22px; }
.dl-head p { margin: 2px 0 0; color: var(--faint); font-size: 14px; }
.os { width: 34px; height: 34px; fill: var(--text); flex: none; }
.dl details { color: var(--muted); font-size: 14.5px; }
.alt-link { margin: -6px 0 0; }
.dl summary { cursor: pointer; color: var(--accent); font-weight: 500; }
.dl ol { padding-left: 20px; margin: 12px 0 0; }
.dl li { margin: 6px 0; }
.dl b { color: var(--text); font-weight: 600; }

.python-note {
  display: flex; align-items: center; gap: 22px; margin: 40px 0 0; padding: 26px 28px;
  border-radius: var(--radius); border: 1px solid rgba(249, 226, 175, .3);
  background: linear-gradient(120deg, rgba(249, 226, 175, .08), rgba(20, 24, 44, .66) 60%);
}
.python-note h3 { font-size: 21px; margin-bottom: 6px; }
.python-note p { margin: 0; color: var(--muted); font-size: 15.5px; }
.python-note p + p { margin-top: 8px; }
.python-note b { color: var(--text); font-weight: 600; }
.python-note .btn { flex: none; }
.python-step {
  flex: none; display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 50%;
  background: rgba(249, 226, 175, .14); border: 1px solid rgba(249, 226, 175, .4);
  color: var(--moon); font: 600 15px var(--mono);
}
.dl-title { display: flex; align-items: center; gap: 14px; font-size: 21px; margin: 40px 0 0; }
.dl-title .python-step { background: rgba(137, 180, 250, .14); border-color: rgba(137, 180, 250, .4); color: var(--accent-2); }
.downloads { margin-top: 20px !important; }

/* ---------- faq ---------- */
.faq h2 { margin-bottom: 36px; }
.faq details { border-top: 1px solid var(--line); padding: 4px 0; max-width: 820px; }
.faq details:last-of-type { border-bottom: 1px solid var(--line); }
.faq summary {
  list-style: none; cursor: pointer; padding: 20px 40px 20px 0; position: relative;
  font: 600 19px var(--display); letter-spacing: -.01em;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 6px; top: 16px; font: 400 26px var(--font); color: var(--accent); transition: transform .2s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { color: var(--muted); margin: 0 0 22px; max-width: 720px; }

/* ---------- final ---------- */
.final { max-width: 760px; margin: 140px auto 0; padding: 64px 24px; text-align: center; position: relative; }
.final::before {
  content: ""; position: absolute; inset: 0; z-index: -1; border-radius: 28px;
  background: radial-gradient(circle at 50% 0%, rgba(137, 180, 250, .2), transparent 65%);
  border: 1px solid var(--line);
}
.final img { margin: 0 auto 22px; border-radius: 22px; }
.final p { color: var(--muted); font-size: 18px; margin: 14px 0 30px; }

/* ---------- footer ---------- */
.footer {
  max-width: var(--max); margin: 100px auto 0; padding: 32px 24px 48px;
  display: flex; flex-wrap: wrap; align-items: center; gap: 20px 32px;
  border-top: 1px solid var(--line); color: var(--faint); font-size: 14px;
}
.footer .brand { font-size: 16px; }
.footer nav { display: flex; gap: 22px; }
.footer nav a { color: var(--muted); }
.footer nav a:hover { color: var(--text); }
.footer p { margin: 0 0 0 auto; }

/* ---------- reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } }

/* ---------- responsive ---------- */
@media (max-width: 960px) {
  .grid, .downloads { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .about { grid-template-columns: 1fr; gap: 40px; }
  .stats { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  body { font-size: 16px; }
  .nav { gap: 12px; padding: 12px 16px; }
  .nav-links { display: none; }
  .nav .btn-small { margin-left: auto; }
  .hero { padding: 56px 16px 24px; }
  .hero-shot { margin-top: 48px; }
  .section { padding: 88px 16px 0; }
  .stats { padding: 0 16px; gap: 10px; }
  .stats strong { font-size: 32px; }
  .grid, .downloads, .steps { grid-template-columns: minmax(0, 1fr); }
  .moon { width: 320px; height: 320px; top: -120px; right: -120px; }
  .footer { padding: 28px 16px 40px; }
  .footer p { margin: 0; }
  .btn { width: 100%; }
  .btn-small { width: auto; }
  .cta { flex-direction: column; }
  .python-note { flex-direction: column; align-items: flex-start; padding: 22px; }
}