:root {
    --bg: #0d0d0d;            /* warm near-black, easier on the eyes for long-form */
    --fg: #e8e6e2;            /* warm off-white body */
    --fg-strong: #fff;
    --accent: #ff2d3a;
    --muted: #8a8a8a;
    --muted-2: #b8b6b1;
    --border: #232323;
    --card: #141414;
    --serif: "Source Serif 4", "Source Serif Pro", "Times New Roman", Georgia, serif;
    --display: "Times New Roman", Georgia, serif;
    --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  }

  * { box-sizing: border-box; }

  html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--fg);
    font-family: var(--serif);
    font-size: 18px;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
  }

  a { color: var(--fg); border-bottom: 1px solid var(--accent); text-decoration: none; transition: color 0.15s; }
  a:hover { color: var(--accent); }

  :focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
  @media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none !important; animation: none !important; } }

  /* ---------- Nav ---------- */
  .nav {
    border-bottom: 1px solid var(--border);
    padding: 1.1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 980px;
    margin: 0 auto;
  }
  .nav .brand {
    font-family: var(--display);
    font-size: 1.6rem;
    letter-spacing: 0.02em;
    color: var(--fg-strong);
    border: none;
  }
  .nav .brand .brand-accent { color: var(--accent); }
  .nav .nav-cta {
    font-family: var(--sans);
    font-size: 0.85rem;
    padding: 0.45rem 1rem;
    border: 1px solid var(--accent);
    border-radius: 999px;
    color: var(--accent);
    letter-spacing: 0.04em;
    transition: all 0.15s ease;
  }
  .nav .nav-cta:hover {
    background: var(--accent);
    color: #fff;
  }

  /* ---------- Article ---------- */
  article {
    max-width: 64ch;
    margin: 0 auto;
    padding: 3rem 1.5rem 5rem;
  }

  .meta {
    color: var(--muted);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 1rem;
  }

  /* ---------- Language toggle ---------- */
  .lang-toggle {
    display: inline-flex;
    gap: 0.35rem;
    margin-bottom: 1.6rem;
  }
  .lang-toggle a {
    color: var(--muted);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.75rem;
    padding: 0.25rem 0.6rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    transition: all 0.15s ease;
  }
  .lang-toggle a:hover {
    color: var(--fg);
    border-color: var(--muted);
    text-decoration: none;
  }
  .lang-toggle a.current {
    color: var(--accent);
    border-color: var(--accent);
  }

  h1 {
    font-family: var(--display);
    color: var(--fg-strong);
    font-size: clamp(2rem, 5vw, 2.8rem);
    line-height: 1.15;
    letter-spacing: -0.01em;
    margin: 0 0 1.2rem;
  }

  .lead {
    font-size: 1.18rem;
    color: var(--muted-2);
    margin: 0 0 2.5rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
    line-height: 1.55;
  }

  h2 {
    font-family: var(--display);
    color: var(--fg-strong);
    font-size: 1.7rem;
    margin: 3rem 0 1rem;
    letter-spacing: -0.01em;
    line-height: 1.25;
  }

  h3 {
    font-family: var(--display);
    color: var(--fg-strong);
    font-size: 1.2rem;
    margin: 2rem 0 0.6rem;
  }

  p { margin: 0 0 1.2rem; }

  strong { color: var(--fg); }
  em { color: var(--muted-2); }

  ul, ol { padding-left: 1.3rem; margin: 0 0 1.2rem; }
  li { margin-bottom: 0.5rem; }

  blockquote {
    border-left: 3px solid var(--accent);
    padding: 0.4rem 0 0.4rem 1.2rem;
    margin: 1.5rem 0;
    color: var(--muted-2);
    font-style: italic;
  }
  blockquote cite {
    display: block;
    margin-top: 0.6rem;
    font-size: 0.9rem;
    color: var(--muted);
    font-style: normal;
  }

  .callout {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.3rem 1.4rem;
    margin: 1.8rem 0;
  }
  .callout-title {
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
  }
  .callout p:last-child { margin-bottom: 0; }

  .cta {
    background: var(--card);
    border: 1px solid var(--border);
    border-top: 1px solid var(--accent);
    border-radius: 10px;
    padding: 1.8rem;
    margin: 3rem 0 2rem;
    text-align: center;
  }
  .cta h3 {
    font-family: var(--display);
    font-size: 1.5rem;
    margin: 0 0 0.6rem;
    color: var(--fg-strong);
  }
  .cta p { color: var(--muted-2); margin-bottom: 1.2rem; font-size: 1rem; }
  .cta-btn {
    display: inline-block;
    padding: 0.85rem 1.6rem;
    background: var(--accent);
    color: #fff;
    border-radius: 6px;
    font-weight: 500;
    font-size: 0.95rem;
    border: none;
    cursor: pointer;
    font-family: var(--sans);
    letter-spacing: 0.02em;
  }
  .cta-btn:hover { filter: brightness(1.08); text-decoration: none; }

  /* ---------- References ---------- */
  .refs {
    margin-top: 3.5rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    font-size: 0.9rem;
    color: var(--muted-2);
  }
  .refs h2 {
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
    margin: 0 0 1rem;
  }
  .refs ol { padding-left: 1.3rem; }
  .refs li { margin-bottom: 0.8rem; line-height: 1.5; }

  /* ---------- Footer ---------- */
  footer.site {
    border-top: 1px solid var(--border);
    padding: 2rem 1.5rem;
    color: var(--muted);
    font-size: 0.9rem;
    text-align: center;
  }
  footer.site a { color: var(--muted-2); }

  /* ---------- Responsive ---------- */
  @media (max-width: 540px) {
    body { font-size: 17px; line-height: 1.65; }
    article { padding: 2rem 1.2rem 3rem; max-width: 92vw; }
    .cta { padding: 1.5rem 1.2rem; }
  }