:root {
    --bg: oklch(0.11 0.01 240);
    --bg2: oklch(0.15 0.012 240);
    --bg3: oklch(0.19 0.013 240);
    --surface: oklch(0.18 0.015 240);
    --border: oklch(0.28 0.015 240);
    --text: oklch(0.94 0.005 240);
    --text-muted: oklch(0.6 0.015 240);
    --accent: oklch(0.65 0.2 180);
    --accent-glow: oklch(0.65 0.2 180 / 0.12);
    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'DM Sans', sans-serif;
  }
  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }
  body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.7;
    overflow-x: hidden;
  }
  body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
      linear-gradient(var(--border) 1px, transparent 1px),
      linear-gradient(90deg, var(--border) 1px, transparent 1px);
    background-size: 80px 80px;
    opacity: 0.2;
    pointer-events: none;
    z-index: 0;
  }

  /* ─── NAV ─── */
  nav {
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 0 6%;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
  }
  .nav-logo {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text);
    text-decoration: none;
  }
  .nav-logo span { color: var(--accent); }
  .nav-back {
    font-family: var(--font-display);
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-muted);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    transition: color 0.2s;
  }
  .nav-back:hover { color: var(--text); }

  /* ─── MAIN ─── */
  main {
    position: relative;
    z-index: 1;
    max-width: 960px;
    margin: 0 auto;
    padding: 80px 6% 120px;
  }
  .page-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 1.25rem;
  }
  .page-eyebrow::before { content: ''; width: 20px; height: 1px; background: var(--accent); }
  h1 {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 0.75rem;
  }
  .update-date {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    padding-bottom: 2.5rem;
    border-bottom: 1px solid var(--border);
  }
  .intro {
    font-size: 1.05rem;
    color: var(--text-muted);
    line-height: 1.8;
    margin-bottom: 3rem;
    padding: 1.5rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-left: 3px solid var(--accent);
    border-radius: 0 8px 8px 0;
  }
  h2 {
    font-family: var(--font-display);
    font-size: 1.15rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--text);
    margin: 2.5rem 0 0.85rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }
  h2::before {
    content: '';
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--accent);
    flex-shrink: 0;
  }
  p { color: var(--text-muted); margin-bottom: 1rem; }
  ul, ol {
    color: var(--text-muted);
    padding-left: 1.5rem;
    margin-bottom: 1rem;
  }
  li { margin-bottom: 0.5rem; line-height: 1.7; }
  li strong { color: var(--text); font-weight: 500; }
  strong { color: var(--text); font-weight: 500; }

  /* ─── CONTACT BOX ─── */
  .contact-box {
    margin-top: 3rem;
    padding: 1.5rem 2rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    position: relative;
    overflow: hidden;
  }
  .contact-box::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), oklch(0.65 0.2 210));
  }
  .contact-box p { margin: 0; font-size: 0.9rem; }
  .contact-box a { color: var(--accent); text-decoration: none; }
  .contact-box a:hover { text-decoration: underline; }

  /* ─── FOOTER ─── */
  footer {
    position: relative;
    z-index: 1;
    background: var(--bg);
    border-top: 1px solid var(--border);
    padding: 2rem 6%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
  }
  .footer-logo {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.02em;
  }
  .footer-logo span { color: var(--accent); }
  .footer-links { display: flex; gap: 1.5rem; }
  .footer-links a {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-decoration: none;
    font-family: var(--font-display);
    transition: color 0.2s;
  }
  .footer-links a:hover { color: var(--text); }
  .footer-copy { font-size: 0.78rem; color: var(--text-muted); }