:root {
  --primary-color: #0d0f12;
  --secondary-color: #1a1d24;
  --accent-color: #00f0ff;
  --text-main: #f5f5f7;
  --text-muted: #86868b;
  --border-color: rgba(255, 255, 255, 0.1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --container-width: 1440px;
  --spacing-unit: 8px;
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--primary-color);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Header & Nav */
.site-header {
  position: fixed;
  top: 0;
  width: 100%;
  padding: 24px 48px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 100;
  background: rgba(13, 15, 18, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}
.site-header.hidden { transform: translateY(-100%); }

.logo { font-size: 1.5rem; font-weight: 700; letter-spacing: -0.02em; text-decoration: none; color: var(--text-main); }
.nav-links { display: flex; gap: 32px; }
.nav-links a {
  color: var(--text-main);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  opacity: 0.8;
  transition: opacity 0.3s;
}
.nav-links a:hover { opacity: 1; }

/* Grid Layouts (3 strategies) */
/* 1. Asymmetric Grid (Home) */
.grid-asymmetric {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}
.grid-asymmetric .hero-span { grid-column: 1 / -1; height: 80vh; }
.grid-asymmetric .half-span { grid-column: span 6; }
.grid-asymmetric .third-span { grid-column: span 4; }

/* 2. Masonry Gallery (Products) */
.grid-masonry {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 32px;
  grid-auto-flow: dense;
}
.grid-masonry .tall { grid-row: span 2; }
.grid-masonry .wide { grid-column: span 2; }

/* 3. Sticky Sidebar Grid (Guides/Support) */
.grid-sticky-sidebar {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 64px;
  align-items: start;
}
.sidebar { position: sticky; top: 120px; }

/* Components */
.container { max-width: var(--container-width); margin: 0 auto; padding: 0 48px; }
.section { padding: 120px 0; }
.section-title { font-size: 3.5rem; font-weight: 600; margin-bottom: 24px; letter-spacing: -0.03em; }
.section-desc { font-size: 1.25rem; color: var(--text-muted); max-width: 600px; margin-bottom: 64px; }

.card {
  background: var(--secondary-color);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 40px;
  position: relative;
  overflow: hidden;
}

.img-wrapper { width: 100%; overflow: hidden; border-radius: 12px; }
.img-wrapper img { width: 100%; height: 100%; object-fit: cover; }

/* CTA Button */
.cta-button {
  display: inline-block;
  padding: 16px 32px;
  background: var(--text-main);
  color: var(--primary-color);
  border-radius: 30px;
  font-weight: 600;
  text-decoration: none;
  font-size: 1rem;
  transition: transform 0.3s, background 0.3s;
}

/* Footer */
.site-footer {
  padding: 80px 48px;
  border-top: 1px solid var(--border-color);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  margin-top: 120px;
}
.footer-col h4 { margin-bottom: 24px; }
.footer-col a { display: block; color: var(--text-muted); text-decoration: none; margin-bottom: 12px; }
.footer-col a:hover { color: var(--text-main); }

/* Utilities */
.text-center { text-align: center; }
.mt-1 { margin-top: 24px; }
.mt-2 { margin-top: 48px; }

/* Responsive */
@media (max-width: 1024px) {
  .grid-asymmetric .half-span { grid-column: span 12; }
  .grid-asymmetric .third-span { grid-column: span 6; }
  .grid-sticky-sidebar { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .section-title { font-size: 2.5rem; }
}
@media (max-width: 768px) {
  .site-header { padding: 16px 24px; }
  .nav-links { display: none; } /* Mobile menu needed if complex, hidden for now */
  .grid-asymmetric .third-span { grid-column: span 12; }
  .grid-masonry .wide, .grid-masonry .tall { grid-column: span 1; grid-row: span 1; }
  .site-footer { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .section { padding: 80px 0; }
  .card { padding: 24px; }
}