@media (min-width: 901px) {
  .header {
    position: sticky;
    top: 0;
    z-index: 50;
    isolation: isolate;
  }

  .header::before {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    z-index: -1;
    width: 100vw;
    transform: translateX(-50%);
    background: rgba(245, 247, 251, 0.92);
    border-bottom: 1px solid rgba(223, 228, 239, 0.85);
    box-shadow: 0 8px 24px rgba(28, 43, 85, 0.05);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
  }

  section[id] {
    scroll-margin-top: 100px;
  }

  .header nav {
    gap: 10px;
  }

  .header nav a {
    padding: 10px 14px;
    background: #fff;
    color: var(--ink);
    border: 1px solid var(--line);
    border-radius: 11px;
    box-shadow: 0 3px 0 #cfd5e2, 0 8px 18px rgba(28, 43, 85, 0.06);
    transition: transform 0.12s ease, box-shadow 0.12s ease, color 0.18s ease;
  }

  .header nav a:hover {
    color: var(--blue);
    transform: translateY(-1px);
    box-shadow: 0 4px 0 #cfd5e2, 0 10px 20px rgba(28, 43, 85, 0.09);
  }

  .portfolio-navigation {
    max-width: 760px;
    margin-top: 28px;
    padding: 18px;
    background: rgba(255, 255, 255, 0.74);
    border: 1px solid var(--line);
    border-radius: 22px;
    box-shadow: 0 14px 32px rgba(28, 43, 85, 0.08);
  }

  .mobile-portfolio-intro {
    display: block;
  }

  .mobile-portfolio-intro strong,
  .mobile-portfolio-intro span {
    display: block;
  }

  .mobile-portfolio-intro strong {
    margin-bottom: 3px;
    font-family: "Space Grotesk", sans-serif;
    font-size: 18px;
  }

  .mobile-portfolio-intro span {
    color: var(--muted);
    font-size: 12px;
  }

  .hero .hero-nav {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
    margin-top: 15px;
  }

  .hero-nav a {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 9px;
    min-height: 58px;
    padding: 10px;
    background: #fff;
    color: var(--ink);
    border: 1px solid var(--ink);
    border-radius: 13px;
    text-align: left;
    font-size: 13px;
    line-height: 1.2;
    box-shadow: 0 4px 0 var(--ink), 0 10px 20px rgba(28, 43, 85, 0.08);
    transition: transform 0.12s ease, box-shadow 0.12s ease;
  }

  .hero-nav a:hover {
    transform: translateY(-1px);
    box-shadow: 0 5px 0 var(--ink), 0 12px 24px rgba(28, 43, 85, 0.1);
  }

  .hero-nav a:active {
    transform: translateY(3px);
    box-shadow: 0 1px 0 var(--ink);
  }

  .hero-nav-index {
    display: grid;
    place-items: center;
    width: 28px;
    height: 28px;
    flex: 0 0 28px;
    border-radius: 8px;
    background: var(--ink);
    color: #fff;
    font-size: 9px;
  }

  .hero-nav .cv-nav-link {
    display: flex;
    background: var(--blue);
    color: #fff;
    border-color: var(--blue);
    box-shadow: 0 4px 0 #1d3cab, 0 10px 20px rgba(49, 88, 232, 0.18);
  }

  .hero-nav .cv-nav-link:hover {
    box-shadow: 0 5px 0 #1d3cab, 0 12px 24px rgba(49, 88, 232, 0.22);
  }

  .hero-nav .cv-nav-link .hero-nav-index {
    background: #fff;
    color: var(--blue);
  }

  .hero .actions {
    display: none;
  }
}