:root {
  --color-bg: #0a0a0a;
  --color-bg-alt: #151515;
  --color-text: #f2f2f2;
  --color-text-muted: #9c9c9c;
  --color-border: #2a2a2a;
  --color-btn-bg: #f2f2f2;
  --color-btn-bg-hover: #d6d6d6;
  --color-btn-text: #111111;
  --radius: 10px;
  --container-width: 1200px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: light) {
  :root {
    --color-bg: #ffffff;
    --color-bg-alt: #f5f5f5;
    --color-text: #212121;
    --color-text-muted: #6b6b6b;
    --color-border: #e2e2e2;
    --color-btn-bg: #212121;
    --color-btn-bg-hover: #050505;
    --color-btn-text: #ffffff;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, p { margin: 0; }
.container { max-width: var(--container-width); margin: 0 auto; padding: 0 1.5rem; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}
.btn-primary {
  background: var(--color-btn-bg);
  color: var(--color-btn-text);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
}
.btn-primary:hover { background: var(--color-btn-bg-hover); }
.btn-ghost { border-color: var(--color-border); color: var(--color-text); }
.btn-ghost:hover { border-color: var(--color-text); }
.btn-lg { padding: 0.85rem 1.75rem; font-size: 1.05rem; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}
@media (prefers-color-scheme: light) {
  .site-header { background: rgba(255, 255, 255, 0.85); }
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; }
.logo-img { height: 43px; width: auto; filter: invert(1) brightness(2); }
@media (prefers-color-scheme: light) {
  .logo-img { filter: none; }
}
.primary-nav { display: flex; align-items: center; gap: 1.75rem; }
.primary-nav a:not(.btn) { color: var(--color-text-muted); font-weight: 500; font-size: 0.95rem; }
.primary-nav a:not(.btn):hover { color: var(--color-text); }
.nav-toggle { display: none; flex-direction: column; gap: 4px; background: none; border: none; cursor: pointer; padding: 0.5rem; }
.nav-toggle span { width: 22px; height: 2px; background: var(--color-text); display: block; }

.site-footer { border-top: 1px solid var(--color-border); padding: 2rem 0; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 1rem; color: var(--color-text-muted); font-size: 0.9rem; }
.footer-links { display: flex; gap: 1.25rem; }
.footer-links a:hover { color: var(--color-text); }

.hero { padding: 6rem 0 5rem; }
.hero-inner { max-width: 780px; }
.hero h1 { font-size: clamp(2.25rem, 5vw, 3.5rem); line-height: 1.15; margin: 0 0 1.25rem; }
.hero-sub { font-size: 1.15rem; color: var(--color-text-muted); margin: 0 0 2rem; max-width: 620px; }
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }

.features { padding: 5rem 0; background: var(--color-bg-alt); border-top: 1px solid var(--color-border); border-bottom: 1px solid var(--color-border); }
.features h2 { font-size: 2rem; margin: 0 0 2.5rem; text-align: center; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.75rem; }
.feature-card { background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 1.75rem; }
.feature-icon { width: 32px; height: 32px; color: var(--color-text); margin-bottom: 1rem; }
.feature-card h3 { margin: 0 0 0.5rem; font-size: 1.05rem; }
.feature-card p { margin: 0; color: var(--color-text-muted); font-size: 0.95rem; }
@media (max-width: 860px) { .feature-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .feature-grid { grid-template-columns: 1fr; } }

.why { padding: 5rem 0; }
.why h2 { font-size: 2rem; margin: 0 0 2.5rem; text-align: center; }
.why-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.why-item h3 { margin: 0 0 0.5rem; }
.why-item p { margin: 0; color: var(--color-text-muted); }
@media (max-width: 720px) { .why-grid { grid-template-columns: 1fr; gap: 2.5rem; } }

.open-source { padding: 5rem 0; background: var(--color-bg-alt); border-top: 1px solid var(--color-border); border-bottom: 1px solid var(--color-border); }
.open-source-inner { max-width: 640px; }
.open-source h2 { font-size: 2rem; margin: 0 0 1rem; }
.open-source p { color: var(--color-text-muted); margin: 0 0 1.5rem; }
.tech-badges { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.75rem; }
.badge { font-size: 0.8rem; font-weight: 600; padding: 0.35rem 0.75rem; border-radius: 999px; border: 1px solid var(--color-border); color: var(--color-text-muted); }

.author { padding: 5rem 0; background: var(--color-bg-alt); border-top: 1px solid var(--color-border); border-bottom: 1px solid var(--color-border); }
.author h2 { font-size: 2rem; margin: 0 0 2.5rem; text-align: center; }
.author-card { display: flex; align-items: center; gap: 1.75rem; max-width: 640px; margin: 0 auto; background: var(--color-bg); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 1.75rem; }
.author-avatar { width: 88px; height: 88px; border-radius: 50%; flex-shrink: 0; }
.author-info h3 { margin: 0 0 0.25rem; font-size: 1.15rem; }
.author-location { margin: 0 0 0.5rem; color: var(--color-text-muted); font-size: 0.85rem; }
.author-bio { margin: 0 0 1rem; color: var(--color-text-muted); font-size: 0.95rem; }
.author-links { display: flex; gap: 0.75rem; flex-wrap: wrap; }
@media (max-width: 560px) {
  .author-card { flex-direction: column; text-align: center; }
  .author-links { justify-content: center; }
}

.contact-band { padding: 5rem 0; text-align: center; }
.contact-band h2 { font-size: 2rem; margin: 0 0 0.75rem; }
.contact-band p { color: var(--color-text-muted); margin: 0 0 2rem; }

@media (max-width: 780px) {
  .nav-toggle { display: flex; }
  .primary-nav {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: flex-start;
    padding: 1.5rem;
    gap: 1.25rem;
    display: none;
  }
  .primary-nav.open { display: flex; }
}