*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    :root {
      --black: #050508; --dark: #0d0d14; --card: #12121c;
      --border: rgba(255,255,255,0.07); --green: #00ff88;
      --white: #f0f0f8; --muted: #7a7a95;
      --font-display: 'Syne', sans-serif; --font-body: 'DM Sans', sans-serif;
    }
    html { scroll-behavior: smooth; }
    body { background: var(--black); color: var(--white); font-family: var(--font-body); font-weight: 300; line-height: 1.7; }

    /* ─── NAV ─── */
    nav {
      position: fixed; top: 0; left: 0; right: 0; z-index: 500;
      padding: 20px 60px; display: flex; align-items: center; justify-content: space-between;
      background: linear-gradient(to bottom, rgba(5,5,8,0.95) 0%, transparent 100%);
      backdrop-filter: blur(10px); border-bottom: 1px solid transparent; transition: border-color 0.3s;
    }
    nav.scrolled { background: rgba(5,5,8,0.98); border-bottom-color: var(--border); }
    .logo { font-family: var(--font-display); font-size: 1.4rem; font-weight: 800; letter-spacing: -0.03em; color: var(--white); text-decoration: none; }
    .logo span { color: var(--green); }
    .nav-links { list-style: none; display: flex; gap: 32px; align-items: center; }
    .nav-links a { color: var(--white); text-decoration: none; font-size: 0.9rem; font-weight: 500; transition: color 0.2s; }
    .nav-links a:hover { color: var(--green); }
    .nav-actions { display: flex; align-items: center; gap: 16px; }
    .nav-login { color: var(--muted); font-size: 0.875rem; text-decoration: none; padding: 7px 16px; border-radius: 100px; border: 1px solid rgba(255,255,255,0.1); transition: color 0.2s, border-color 0.2s; }
    .nav-login:hover { color: var(--white); border-color: rgba(255,255,255,0.25); }
    .nav-cta { background: var(--green); color: var(--black); text-decoration: none; padding: 9px 20px; border-radius: 100px; font-family: var(--font-display); font-weight: 700; font-size: 0.875rem; transition: box-shadow 0.2s; }
    .nav-cta:hover { box-shadow: 0 0 20px rgba(0,255,136,0.4); }
    /* ─── LANGUAGE DROPDOWN ─── */
    .nav-lang-dropdown { position: relative; display: inline-block; margin-right: 16px; }
    .nav-lang-btn { background: none; border: none; color: var(--muted); font-family: var(--font-body); font-weight: 600; font-size: 0.875rem; cursor: pointer; padding: 8px 0; transition: color 0.2s; }
    .nav-lang-btn:hover { color: var(--white); }
    .nav-lang-menu { position: absolute; top: calc(100% + 8px); right: 0; background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 8px 0; min-width: 140px; opacity: 0; visibility: hidden; transform: translateY(10px); transition: all 0.2s; box-shadow: 0 10px 40px rgba(0,0,0,0.5); z-index: 1000; }
    .nav-lang-dropdown:hover .nav-lang-menu { opacity: 1; visibility: visible; transform: translateY(0); }
    .nav-lang-menu a { display: block; padding: 8px 20px; color: var(--muted); text-decoration: none; font-size: 0.875rem; transition: background 0.2s, color 0.2s; }
    .nav-lang-menu a:hover { background: rgba(255,255,255,0.05); color: var(--white); }
    .nav-lang-menu a.active { color: var(--green); font-weight: 600; background: rgba(0,255,136,0.05); }
    .mobile-menu-btn { display: none; background: none; border: none; color: var(--white); font-size: 1.5rem; cursor: pointer; padding: 0; line-height: 1; }
    /* ─── HERO ─── */
    .page-hero { padding: 140px 40px 60px; text-align: center; border-bottom: 1px solid var(--border); background: linear-gradient(to bottom, rgba(0,255,136,0.04) 0%, transparent 100%); }
    .page-tag { font-size: 0.75rem; letter-spacing: 0.15em; text-transform: uppercase; color: var(--green); margin-bottom: 16px; }
    .page-title { font-family: var(--font-display); font-size: clamp(2rem, 4vw, 3rem); font-weight: 800; letter-spacing: -0.03em; margin-bottom: 16px; }
    .page-meta { color: var(--muted); font-size: 0.9rem; }
    .page-meta span { color: var(--green); }
    /* ─── LAYOUT ─── */
    .layout { display: grid; grid-template-columns: 260px 1fr; gap: 60px; max-width: 1100px; margin: 0 auto; padding: 60px 40px 100px; align-items: start; }
    /* ─── SIDEBAR ─── */
    .sidebar { position: sticky; top: 100px; }
    .sidebar-title { font-size: 0.7rem; letter-spacing: 0.15em; text-transform: uppercase; color: var(--muted); margin-bottom: 16px; }
    .sidebar-nav { list-style: none; display: flex; flex-direction: column; gap: 4px; }
    .sidebar-nav a { display: block; padding: 8px 14px; border-radius: 8px; color: var(--muted); text-decoration: none; font-size: 0.875rem; border-left: 2px solid transparent; transition: all 0.2s; }
    .sidebar-nav a:hover, .sidebar-nav a.active { color: var(--white); border-left-color: var(--green); background: rgba(0,255,136,0.05); }
    /* ─── CONTENT ─── */
    .content { min-width: 0; }
    .section { margin-bottom: 56px; padding-bottom: 56px; border-bottom: 1px solid var(--border); }
    .section:last-child { border-bottom: none; }
    .section h2 { font-family: var(--font-display); font-size: 1.5rem; font-weight: 700; margin-bottom: 20px; display: flex; align-items: center; gap: 12px; scroll-margin-top: 120px; }
    .section h2 .icon { font-size: 1.2rem; }
    .section p { color: rgba(240,240,248,0.8); margin-bottom: 16px; font-size: 0.975rem; }
    .section p:last-child { margin-bottom: 0; }
    .section ul, .section ol { padding-left: 0; list-style: none; display: flex; flex-direction: column; gap: 10px; margin-bottom: 16px; }
    .section ul li, .section ol li { display: flex; align-items: flex-start; gap: 10px; color: rgba(240,240,248,0.8); font-size: 0.975rem; }
    .section ul li::before { content: '—'; color: var(--green); flex-shrink: 0; margin-top: 1px; }
    .section ol { counter-reset: ol-counter; }
    .section ol li { counter-increment: ol-counter; }
    .section ol li::before { content: counter(ol-counter) '.'; color: var(--green); font-family: var(--font-display); font-weight: 700; flex-shrink: 0; min-width: 20px; }
    .highlight-box { background: rgba(0,255,136,0.05); border: 1px solid rgba(0,255,136,0.15); border-radius: 12px; padding: 20px 24px; margin: 20px 0; color: rgba(240,240,248,0.85); font-size: 0.9rem; }
    .highlight-box strong { color: var(--green); }
    a.inline-link { color: var(--green); text-decoration: none; border-bottom: 1px solid rgba(0,255,136,0.3); transition: border-color 0.2s; }
    a.inline-link:hover { border-bottom-color: var(--green); }
    /* ─── FOOTER ─── */
    footer { background: var(--dark); border-top: 1px solid var(--border); padding: 60px 40px 40px; }
    .footer-grid { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 60px; text-align: left; }
    .footer-brand p { color: var(--muted); font-size: 0.9rem; line-height: 1.7; margin-top: 16px; max-width: 280px; }
    .footer-col .footer-title { font-family: var(--font-display); font-weight: 700; margin-bottom: 20px; font-size: 0.9rem; letter-spacing: 0.05em; color: var(--white); }
    .footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 12px; padding: 0; }
    .footer-col ul a { color: var(--muted); text-decoration: none; font-size: 0.9rem; transition: color 0.2s; }
    .footer-col ul a:hover { color: var(--white); }
    .footer-bottom { max-width: 1200px; margin: 48px auto 0; padding-top: 28px; border-top: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; font-size: 0.85rem; color: var(--muted); }
    .footer-bottom a { color: var(--muted); text-decoration: none; transition: color 0.2s; }
    .footer-bottom a:hover { color: var(--white); }
    /* ─── BACK TO TOP ─── */
    .back-to-top { position: fixed; bottom: 30px; right: 30px; width: 50px; height: 50px; background: rgba(0,255,136,0.1); backdrop-filter: blur(10px); border: 1px solid rgba(0,255,136,0.3); color: var(--green); border-radius: 50%; cursor: pointer; display: flex; align-items: center; justify-content: center; z-index: 1000; opacity: 0; visibility: hidden; transition: all 0.3s cubic-bezier(0.4,0,0.2,1); box-shadow: 0 10px 30px rgba(0,0,0,0.3); }
    .back-to-top.visible { opacity: 1; visibility: visible; bottom: 40px; }
    .back-to-top:hover { background: var(--green); color: var(--black); transform: translateY(-5px); box-shadow: 0 0 30px rgba(0,255,136,0.4); }
    @media (max-width: 1100px) {
        nav { padding: 16px 20px; }
        .mobile-menu-btn { display: block; }
        .nav-login, .nav-cta { display: none; }
        .nav-links { display: none; flex-direction: column; gap: 0; position: fixed; top: 58px; left: 0; right: 0; background: rgba(5,5,8,0.98); backdrop-filter: blur(14px); padding: 20px 0; border-bottom: 1px solid var(--border); }
        .nav-links.active { display: flex; }
        .nav-links li { width: 100%; text-align: center; }
        .nav-links a { display: block; padding: 16px 20px; font-size: 1.1rem; }
        .nav-lang-dropdown { margin-right: 0; }
        .page-hero { padding: 100px 20px 40px; }
        .layout { grid-template-columns: 1fr; padding: 40px 20px 60px; gap: 40px; }
        .sidebar { position: static; }
        .footer-grid { grid-template-columns: 1fr 1fr; gap: 40px; text-align: left; word-break: break-word; }
        .footer-brand { grid-column: 1 / -1; text-align: center; }
        .footer-brand p { margin: 16px auto 0; }
        .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
        footer { padding: 40px 20px; }
    }
    @media (max-width: 600px) {
        .footer-grid { grid-template-columns: 1fr; text-align: center; }
        .footer-brand { grid-column: auto; }
    }