:root {
  --ground: #0f1217;
  --ground-2: #161c2a;
  --rail: #232f45;
  --ink: #f4f6f8;
  --ink-2: #b9c2d6;
  --accent: #2f4fe0;
  --accent-2: #8ea8ff;
  --card: #1a2238;
  --line: rgba(142, 168, 255, 0.18);
  --max: 1120px;
}
* { box-sizing: border-box; }
html { color-scheme: dark; scroll-behavior: smooth; }
body { margin: 0; background: var(--ground); color: var(--ink); font: 17px/1.6 Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif; }
img, video { max-width: 100%; height: auto; display: block; }
a { color: var(--accent-2); }
h1, h2, h3 { line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 0.5em; }
h1 { font-size: clamp(1.9rem, 4.2vw, 3.2rem); font-weight: 800; }
h2 { font-size: clamp(1.4rem, 2.6vw, 2rem); font-weight: 700; }
h3 { font-size: 1.2rem; font-weight: 700; }
p { margin: 0 0 1em; }
main { max-width: var(--max); margin: 0 auto; padding: 0 20px 60px; }

.top { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 12px 20px; background: rgba(15, 18, 23, 0.92); backdrop-filter: blur(12px); border-bottom: 1px solid var(--line); }
.top .brand img { height: 40px; width: auto; }
.top nav ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 4px 18px; align-items: center; }
.top nav a { color: var(--ink-2); text-decoration: none; font-weight: 600; font-size: 0.95rem; }
.top nav a[aria-current="page"] { color: var(--ink); }
.cta { display: inline-block; background: var(--accent); color: #fff !important; padding: 10px 20px; border-radius: 12px; font-weight: 700; text-decoration: none; box-shadow: 0 10px 30px rgba(47, 79, 224, 0.35); }
.ghost { display: inline-block; color: var(--ink); padding: 10px 20px; border-radius: 12px; border: 1px solid var(--line); text-decoration: none; font-weight: 600; margin-left: 10px; }

.hero { padding: 64px 0 24px; max-width: 880px; }
.kicker { color: var(--accent-2); font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.8rem; margin-bottom: 14px; }
.lead { font-size: 1.15rem; color: var(--ink-2); }
.actions { margin-top: 22px; }

.video { margin: 24px 0 48px; }
.video video { width: 100%; border-radius: 18px; background: #000; box-shadow: 0 40px 90px rgba(0, 0, 0, 0.55); }
.video figcaption { color: var(--ink-2); font-size: 0.9rem; margin-top: 10px; }

.feat { padding: 28px 0; border-top: 1px solid var(--line); max-width: 880px; }
.feat ul { padding-left: 1.2em; color: var(--ink-2); }
.feat li { margin-bottom: 0.4em; }

.faq { padding: 28px 0; border-top: 1px solid var(--line); max-width: 880px; }
.faq details { background: var(--card); border-radius: 14px; padding: 14px 18px; margin-bottom: 10px; }
.faq summary { cursor: pointer; font-weight: 700; }
.faq details p { margin: 10px 0 0; color: var(--ink-2); }

.modules { padding: 36px 0; border-top: 1px solid var(--line); }
.modules .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; }
.mod { display: block; background: var(--card); border-radius: 18px; overflow: hidden; text-decoration: none; color: var(--ink); border: 1px solid var(--line); transition: transform 0.15s ease, border-color 0.15s ease; }
.mod:hover { transform: translateY(-3px); border-color: var(--accent-2); }
.mod h3 { margin: 14px 16px 6px; }
.mod p { margin: 0 16px 10px; color: var(--ink-2); font-size: 0.95rem; }
.mod .more { display: block; margin: 0 16px 16px; color: var(--accent-2); font-weight: 700; font-size: 0.95rem; }

.related { padding: 28px 0; border-top: 1px solid var(--line); color: var(--ink-2); }
.related ul { padding-left: 1.2em; }
.demo { padding: 40px 32px; margin-top: 24px; border-radius: 22px; background: linear-gradient(160deg, var(--rail), var(--ground-2)); border: 1px solid var(--line); }

footer { border-top: 1px solid var(--line); padding: 28px 20px 40px; color: var(--ink-2); font-size: 0.9rem; max-width: var(--max); margin: 0 auto; }
footer a { color: var(--ink-2); }
.small { opacity: 0.7; }

@media (max-width: 720px) {
  .top { flex-direction: column; align-items: flex-start; }
  .hero { padding-top: 36px; }
  .ghost { margin-left: 0; margin-top: 10px; }
}