*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  :root {
    --blue: #1a56ff;
    --blue-mid: #4f75ff;
    --dark: #111320;     /* FIXED: was commented out, causing color bugs */
    --muted: #6b7280;
    --white: #ffffff;
    --border: #e2e6f0;
    --off: #f7f8fc;
  }
  
  .header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: box-shadow 0.3s ease;
  }
  
  .header.scrolled {
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
  }
  
  .nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 clamp(1rem, 4vw, 2.5rem);
  }
  
  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
    gap: 2rem;
  }
  
  /* =========================
     LOGO
  ========================= */
  .logo {
    display: flex;
    align-items: center;
    gap: 14px;
    text-decoration: none;
    flex-shrink: 0;
  }
  
  .logo:hover { text-decoration: none; }
  
  .logo-box {
    width: 52px;
    height: 52px;
    border-radius: 10px;
    object-fit: contain;
    padding: 4px;
    transition: transform 0.2s ease;
  }
  
  .logo:hover .logo-box {
    transform: scale(1.05);
  }
  
  .logo-text {
    font-family: 'Syne', sans-serif;
    font-size: 26px;
    font-weight: 800;
    color: #000000;        /* "FileSync" — black */
    letter-spacing: -0.5px;
  }
  
  .logo-accent {
    color: #1a56ff;        /* "AI" — blue */
  }
  
  /* =========================
     DESKTOP NAV
  ========================= */
  .nav-desktop {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 1;
    justify-content: center;
  }
  
  .nav-link {
    font-family: 'Inter', sans-serif;
    font-size: 15px;
    font-weight: 400;
    color: var(--muted);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 6px;
    transition: all 0.2s ease;
    white-space: nowrap;
  }
  
  .nav-link:hover {
    color: var(--dark);
    background: var(--off);
    text-decoration: none;
  }
  
  .nav-link.active {
    /* color: var(--blue);
    font-weight: 600;
    background: rgba(26, 86, 255, 0.06); */
  }
  
  /* =========================
     RIGHT SIDE
  ========================= */
  .nav-right {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
  }
  
  .nav-cta {
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    font-weight: 600;
    background: var(--blue);
    color: #fff;
    padding: 11px 24px;
    border-radius: 8px;
    text-decoration: none;
    transition: all 0.2s ease;
    box-shadow: 0 2px 12px rgba(26, 86, 255, 0.25);
    white-space: nowrap;
  }
  
  .nav-cta:hover {
    background: var(--blue-mid);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(26, 86, 255, 0.35);
    color: #fff;
    text-decoration: none;
  }
  
  /* =========================
     HAMBURGER
  ========================= */
  .menu-btn {
    display: none;
    background: none;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px 12px;
    color: var(--dark);
    cursor: pointer;
    font-size: 22px;
    line-height: 1;
    transition: all 0.2s ease;
  }
  
  .menu-btn:hover {
    background: var(--off);
    border-color: var(--blue);
    color: var(--blue);
  }
  
  /* =========================
     MOBILE NAV
  ========================= */
  .nav-mobile {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: 16px 0 24px;
    border-top: 1px solid var(--border);
  }
  
  .nav-mobile .nav-link {
    padding: 12px 14px;
    border-radius: 8px;
    font-size: 16px;
  }
  
  .nav-cta-mobile {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-top: 10px;
    padding: 14px 20px;
    background: var(--blue);
    color: #fff;
    border-radius: 8px;
    font-family: 'Inter', sans-serif;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    text-align: center;
    box-shadow: 0 4px 16px rgba(26, 86, 255, 0.3);
    transition: all 0.2s ease;
  }
  
  .nav-cta-mobile:hover {
    background: var(--blue-mid);
    color: #fff;
    text-decoration: none;
  }
  
  .nav-mobile.show {
    display: flex;
  }
  
  /* =========================
     RESPONSIVE
  ========================= */
  @media (max-width: 768px) {
    .nav-desktop { display: none; }
    .nav-cta { display: none; }
    .menu-btn { display: flex; align-items: center; justify-content: center; }
  }
  
  @media (max-width: 480px) {
    .header-inner { height: 70px; }
    .logo-text { font-size: 22px; }
    .logo-box { width: 42px; height: 42px; }
  }
  
  @media (min-width: 769px) {
    .nav-mobile { display: none !important; }
  }