:root {
  --bg: #0a0a0a;
  --bg-raised: #141417;
  --fg: #e8e9ed;
  --fg-dim: #9aa0ac;
  --border: #22242a;
  --accent: #6a97fb;
  --accent-strong: #4670d1;
  --radius: 12px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  padding: 0.1em 0.4em;
  border-radius: 4px;
}

/* Nav */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 32px;
  max-width: 1100px;
  margin: 0 auto;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--fg);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: 0.2px;
}
.brand:hover { color: var(--fg); }
.nav nav a {
  color: var(--fg-dim);
  font-size: 15px;
  margin-left: 24px;
}
.nav nav a:hover { color: var(--fg); }

/* Hero */
.hero {
  text-align: center;
  padding: 80px 32px 64px;
  max-width: 760px;
  margin: 0 auto;
}
.hero-icon {
  margin-bottom: 28px;
  filter: drop-shadow(0 12px 32px rgba(106, 151, 251, 0.3));
}
.hero h1 {
  font-size: clamp(32px, 6vw, 56px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 20px;
}
.tagline {
  font-size: 18px;
  color: var(--fg-dim);
  max-width: 580px;
  margin: 0 auto 16px;
}
.promise {
  font-size: 16px;
  color: var(--fg);
  margin-bottom: 36px;
}
.promise strong {
  background: linear-gradient(90deg, var(--accent), var(--accent-strong));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* CTA */
.cta {
  display: inline-flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 14px;
}
.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 15px;
  border: 1px solid transparent;
  transition: transform 0.1s, background 0.15s, border 0.15s;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: linear-gradient(180deg, var(--accent), var(--accent-strong));
  color: #fff;
}
.btn-primary:hover { color: #fff; }
.btn-secondary {
  background: var(--bg-raised);
  color: var(--fg);
  border-color: var(--border);
}
.btn-secondary:hover { color: var(--fg); border-color: var(--accent); }
.note {
  color: var(--fg-dim);
  font-size: 13px;
  margin-top: 6px;
}

/* Sections */
section.features,
section.off-script,
section.stack {
  max-width: 1000px;
  margin: 0 auto;
  padding: 64px 32px;
}
section h2 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 32px;
  text-align: center;
}

/* Feature grid */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}
.grid article {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border 0.15s;
}
.grid article:hover { border-color: var(--accent); }
.grid h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 10px;
}
.grid p {
  color: var(--fg-dim);
  font-size: 15px;
}

/* Off-script list */
.off-script ul {
  list-style: none;
  max-width: 620px;
  margin: 0 auto;
}
.off-script li {
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  color: var(--fg-dim);
}
.off-script li:last-child { border-bottom: none; }

/* Stack */
.stack p {
  text-align: center;
  color: var(--fg-dim);
  max-width: 600px;
  margin: 0 auto;
}

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 32px;
  text-align: center;
  color: var(--fg-dim);
  font-size: 14px;
}
footer div {
  display: inline-flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 12px;
}
footer a { color: var(--fg-dim); }
footer a:hover { color: var(--fg); }
.copy {
  font-size: 13px;
  margin-top: 8px;
}

/* Mobile */
@media (max-width: 640px) {
  .nav { padding: 14px 20px; }
  .hero { padding: 56px 20px 40px; }
  section.features,
  section.off-script,
  section.stack { padding: 48px 20px; }
}