/* Layout primitives: container, sections, grids, header, footer */
.container { width: min(var(--container), 100% - var(--gutter) * 2); margin-inline: auto; }
.section { padding: var(--section) 0; position: relative; }
[id] { scroll-margin-top: 88px; }
.section-sm { padding: 64px 0; }
.section-tight { padding: 48px 0; }
.section-alt { background: linear-gradient(180deg, #080b14, #0a0e18); border-block: 1px solid var(--line); }
.section-head { max-width: 720px; margin-bottom: 40px; }
.section-head.center { margin-inline: auto; text-align: center; }
.section-head p { color: var(--fg-muted); font-size: 1.06rem; margin: 0; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px; margin-bottom: 14px;
  font-size: 0.76rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--violet-soft); font-weight: 600;
}
.eyebrow::before { content: ""; width: 18px; height: 1px; background: currentColor; opacity: 0.7; }
.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.split { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 56px; align-items: center; }
.stack-lg > * + * { margin-top: 28px; }
.muted { color: var(--fg-muted); }
.dim { color: var(--fg-dim); }
.small { font-size: 0.88rem; }
.center { text-align: center; }
.mt-32 { margin-top: 32px; }
.mt-48 { margin-top: 48px; }
.hide-sm { display: inline-flex; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 90;
  border-bottom: 1px solid transparent;
  backdrop-filter: blur(14px);
  background: rgba(6, 8, 15, 0.55);
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease);
}
.site-header.is-scrolled { background: rgba(6, 8, 15, 0.88); border-bottom-color: var(--line); }
.nav-inner { display: flex; align-items: center; gap: 32px; height: 70px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 600; font-size: 1.06rem; letter-spacing: -0.01em; }
.logo-mark { width: 28px; height: 28px; flex: none; }
.nav-links { display: flex; align-items: center; gap: 26px; margin-left: 8px; }
.nav-links a { font-size: 0.92rem; color: var(--fg-muted); transition: color 0.2s; }
.nav-links a:hover, .nav-links a.is-active { color: var(--fg); }
.nav-actions { margin-left: auto; display: flex; align-items: center; gap: 14px; }
.nav-toggle {
  display: none; width: 38px; height: 34px; border: 1px solid var(--line);
  background: transparent; border-radius: 9px; cursor: pointer; padding: 9px 8px;
}
.nav-toggle span { display: block; height: 1.5px; background: var(--fg); margin: 4px 0; transition: transform 0.25s, opacity 0.25s; }

/* Footer */
.site-footer { background: #04060c; border-top: 1px solid var(--line); padding: 64px 0 32px; }
.footer-top { display: grid; grid-template-columns: 1.6fr repeat(4, 1fr); gap: 36px; }
.footer-brand p { color: var(--fg-muted); font-size: 0.9rem; margin: 14px 0 18px; max-width: 34ch; }
.footer-col h4 { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--fg-dim); margin-bottom: 14px; }
.footer-col a { display: block; font-size: 0.9rem; color: var(--fg-muted); padding: 5px 0; }
.footer-col a:hover { color: var(--fg); }
.footer-bottom {
  display: flex; flex-wrap: wrap; gap: 12px 28px; align-items: center; justify-content: space-between;
  margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--line);
  font-size: 0.82rem; color: var(--fg-dim);
}
.footer-bottom p { margin: 0; }
.footer-social { display: flex; gap: 18px; }
.footer-social a:hover { color: var(--fg); }

/* Responsive */
@media (max-width: 1080px) {
  .footer-top { grid-template-columns: 1.4fr repeat(2, 1fr); }
  .split { gap: 36px; grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 860px) {
  :root { --section: 72px; --gutter: 18px; }
  .nav-links {
    position: fixed; inset: 70px 0 auto; flex-direction: column; align-items: flex-start;
    gap: 0; padding: 8px 22px 22px; background: #080b14;
    border-bottom: 1px solid var(--line); display: none;
  }
  .nav-links.is-open { display: flex; }
  .nav-links a { width: 100%; padding: 13px 0; border-bottom: 1px solid var(--line); font-size: 1rem; }
  .nav-toggle { display: block; }
  .hide-sm { display: none; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 28px; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 520px) {
  .grid-4 { grid-template-columns: 1fr; }
}