:root {
  --ink: #0A1628;
  --ink-deep: #050B16;
  --paper: #F5F7FA;
  --accent: #3B82F6;
  --accent-dim: #1E40AF;
  --accent-ink: #1E40AF;
  --muted: #8B9DC3;
  --muted-dark: #7A8FB5;
  --line-d: rgba(139, 157, 195, 0.18);
  --line-d-strong: rgba(139, 157, 195, 0.32);

  --font-sans: 'Inter', -apple-system, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  --font-serif: 'Fraunces', Georgia, serif;

  --pad-x: clamp(24px, 6vw, 120px);
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--ink-deep); color: var(--paper); font-family: var(--font-sans); -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
body { overflow-x: hidden; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.skip-link {
  position: fixed; left: 16px; top: 16px; z-index: 1000;
  transform: translateY(-140%);
  background: var(--paper); color: var(--ink-deep);
  padding: 12px 16px; border: 1px solid var(--ink-deep);
  transition: transform 160ms ease;
}
.skip-link:focus { transform: translateY(0); }

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ── Nav ─────────────── */
.site-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px var(--pad-x);
  font-family: var(--font-mono); font-size: 13px;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--muted);
  background: rgba(5,11,22,0.78);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line-d);
}
.site-nav .brand img { height: 44px; width: auto; display: block; }
.site-nav .links { display: flex; gap: 36px; align-items: center; }
.site-nav .links a { transition: color 180ms; }
.site-nav .links a:hover { color: var(--accent); }
.site-nav .cta {
  padding: 10px 18px; border: 1px solid var(--line-d-strong); color: var(--paper);
  transition: background 180ms, color 180ms, border-color 180ms;
}
.site-nav .cta:hover { background: var(--accent-dim); border-color: var(--accent-dim); }
.lang-switch {
  font-size: 11px; letter-spacing: 0.12em; padding: 4px 10px;
  border: 1px solid currentColor; color: var(--paper); transition: color 150ms, border-color 150ms;
}
.lang-switch:hover { color: var(--paper-dim); }
.mobile-nav-toggle {
  display: none;
  width: 48px; height: 48px; padding: 0;
  border: 1px solid currentColor; background: transparent; color: inherit;
  align-items: center; justify-content: center; flex-direction: column; gap: 5px;
}
.mobile-nav-toggle span { width: 18px; height: 1px; background: currentColor; transition: transform 180ms ease, opacity 180ms ease; }
.site-nav.menu-open .mobile-nav-toggle span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.site-nav.menu-open .mobile-nav-toggle span:nth-child(2) { opacity: 0; }
.site-nav.menu-open .mobile-nav-toggle span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
.mobile-menu {
  display: none;
  position: absolute;
  top: calc(100% + 1px);
  left: 0;
  right: 0;
  padding: 12px var(--pad-x) 20px;
  background: rgba(5,11,22,0.96);
  border-bottom: 1px solid var(--line-d);
}
.mobile-menu a {
  display: block;
  padding: 14px 0;
  border-top: 1px solid var(--line-d);
}
.mobile-menu .cta,
.mobile-menu .lang-switch {
  margin-top: 12px;
  text-align: center;
}
.site-nav.menu-open .mobile-menu { display: block; }

/* ── Article header ─────────────── */
.article-header {
  padding: 180px var(--pad-x) 64px;
  border-bottom: 1px solid var(--line-d);
  position: relative;
}
.article-header-inner { max-width: 800px; margin: 0 auto; }
.article-header .category {
  font-family: var(--font-mono); font-size: 12px;
  letter-spacing: 0.3em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 24px;
  display: flex; align-items: center; gap: 14px;
}
.article-header .category::before {
  content: ''; width: 32px; height: 1px; background: var(--accent);
}
.article-header h1 {
  font-size: clamp(36px, 5vw, 64px);
  font-weight: 700; letter-spacing: -0.025em; line-height: 1.05;
  margin: 0 0 28px; text-wrap: balance;
}
.article-header .meta {
  display: flex; gap: 24px; flex-wrap: wrap;
  font-family: var(--font-mono); font-size: 12px;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--muted-dark);
}
.article-header .meta .sep { width: 2px; height: 2px; background: var(--muted-dark); border-radius: 50%; align-self: center; }

/* ── Article body ─────────────── */
.article-body {
  max-width: 800px; margin: 0 auto;
  padding: 64px var(--pad-x) 96px;
}
.article-body p {
  font-size: 18px; line-height: 1.7; color: var(--muted);
  margin: 0 0 28px; font-weight: 300;
}
.article-body p:first-child {
  font-size: 20px; color: var(--paper); font-weight: 400;
}
.article-body h2 {
  font-size: 28px; font-weight: 600; letter-spacing: -0.015em;
  margin: 48px 0 20px; color: var(--paper);
}
.article-body blockquote {
  margin: 32px 0; padding: 24px 32px;
  border-left: 3px solid var(--accent);
  background: rgba(59,130,246,0.04);
  font-style: italic; color: var(--muted);
}

/* ── Back link ─────────────── */
.back-link {
  display: inline-flex; align-items: center; gap: 12px;
  font-family: var(--font-mono); font-size: 12px;
  letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--accent); transition: gap 200ms;
  max-width: 800px; margin: 0 auto;
  padding: 0 var(--pad-x) 64px;
}
.back-link:hover { gap: 16px; }
.back-link .arrow {
  width: 24px; height: 1px; background: var(--accent);
  position: relative;
}
.back-link .arrow::before {
  content: ''; position: absolute; left: 0; top: -4px;
  width: 10px; height: 10px;
  border-left: 1px solid var(--accent);
  border-bottom: 1px solid var(--accent);
  transform: rotate(45deg);
}

/* ── Footer ─────────────── */
.site-footer {
  padding: 64px var(--pad-x) 40px;
  border-top: 1px solid var(--line-d);
  background: var(--ink-deep);
}
.footer-inner { max-width: 1240px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; gap: 32px; flex-wrap: wrap; }
.footer-inner img { height: 40px; }
.footer-inner .legal {
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--muted-dark);
}

@media (max-width: 820px) {
  .mobile-nav-toggle { display: inline-flex; }
  .site-nav .links { display: none; }
}

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