/* Syllepsis landing page — one small stylesheet, system font stack, no framework. */

:root {
  --bg: #0e1116;
  --bg-elev: #161b22;
  --card: #1b2230;
  --text: #e6edf3;
  --muted: #9aa7b4;
  --accent: #6ea8fe;
  --accent-strong: #4b8bff;
  --border: #2a3342;
  --radius: 12px;
  --max: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
    "Apple Color Emoji", "Segoe UI Emoji", sans-serif;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #ffffff;
    --bg-elev: #f6f8fa;
    --card: #ffffff;
    --text: #1c2128;
    --muted: #57606a;
    --accent: #2f6fed;
    --accent-strong: #1f5fe0;
    --border: #d0d7de;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

h1, h2, h3 { line-height: 1.2; letter-spacing: -0.01em; }

section { padding: 5rem 1.25rem; }
section:nth-child(even) { background: var(--bg-elev); }

main > section > :is(h2, p),
.hero-copy,
.faq details { max-width: var(--max); margin-left: auto; margin-right: auto; }

/* Header */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1.25rem;
  max-width: var(--max);
  margin: 0 auto;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  color: var(--text);
  font-size: 1.1rem;
}
.brand:hover { text-decoration: none; }
.site-nav { display: flex; gap: 1.25rem; flex-wrap: wrap; }
.site-nav a { color: var(--muted); font-weight: 500; }
.site-nav a:hover { color: var(--text); text-decoration: none; }

/* Hero */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  max-width: var(--max);
  margin: 0 auto;
  padding-top: 4rem;
}
.hero h1 { font-size: clamp(2.2rem, 5vw, 3.4rem); margin: 0 0 1rem; }
.lede { font-size: 1.2rem; color: var(--muted); margin: 0 0 1.75rem; }
.lede em { color: var(--text); font-style: normal; font-weight: 600; }
.cta-row { display: flex; gap: 0.75rem; flex-wrap: wrap; }
.cta-sub { margin-top: 1rem; color: var(--muted); font-size: 0.95rem; }

.hero-shot img {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
  background: var(--card);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius);
  font-weight: 600;
  border: 1px solid transparent;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--accent-strong); color: #fff; }
.btn-primary:hover { filter: brightness(1.08); }
.btn-secondary { background: transparent; color: var(--text); border-color: var(--border); }
.btn-secondary:hover { border-color: var(--accent); }

/* Features */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  max-width: var(--max);
  margin: 0 auto;
}
.feature h2 { font-size: 1.4rem; margin: 0 0 0.75rem; }
.feature p { color: var(--muted); margin: 0; }
.feature-list { color: var(--muted); margin: 0; padding-left: 1.1rem; }
.feature-list li { margin-bottom: 0.5rem; }
.feature-list strong, .feature p strong { color: var(--text); }

/* Downloads */
.downloads h2, .open-source h2, .faq h2 { font-size: 2rem; margin: 0 0 0.5rem; }
.downloads-meta { color: var(--muted); margin-top: 0; }
.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  max-width: var(--max);
  margin: 2rem auto 1.5rem;
}
.download-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}
.download-card h3 { margin: 0 0 0.75rem; font-size: 1.15rem; }
.download-card ul { list-style: none; margin: 0; padding: 0; }
.download-card li { margin-bottom: 0.5rem; }
.download-card .size { color: var(--muted); font-size: 0.85rem; margin-left: 0.35rem; }
.muted { color: var(--muted); }
.all-releases { max-width: var(--max); margin: 0 auto; }

/* FAQ */
.faq details {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.5rem 1rem;
  margin-bottom: 0.75rem;
  background: var(--card);
}
.faq summary {
  cursor: pointer;
  font-weight: 600;
  padding: 0.5rem 0;
}
.faq details[open] summary { margin-bottom: 0.25rem; }
.faq details p { color: var(--muted); margin: 0.25rem 0 0.75rem; }

/* Footer */
.site-footer {
  padding: 2.5rem 1.25rem;
  text-align: center;
  color: var(--muted);
  border-top: 1px solid var(--border);
}

/* Responsive */
@media (max-width: 760px) {
  .hero { grid-template-columns: 1fr; padding-top: 1rem; }
  .hero-shot { order: -1; }
  section { padding: 3.5rem 1.25rem; }
}