/* Transparent desktop header and responsive mobile overhaul */
nav.top {
  background: transparent;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  padding-right: 4px;
}

.nav-links {
  flex-wrap: nowrap;
  min-width: 0;
}

.lang-switch {
  flex-shrink: 0;
  padding-right: 2px;
}

@media (max-width: 900px) {
  .home-preview .wrap {
    padding-inline: 20px;
  }

  .preview-hero {
    gap: 48px;
    padding: 56px 0 72px;
  }

  .preview-hero .hero-copy {
    max-width: 720px;
  }

  .preview-hero h1 {
    max-width: 720px;
    font-size: clamp(4rem, 12vw, 7rem);
    line-height: .88;
  }

  .preview-hero .hero-sub {
    max-width: 620px;
    margin-top: 28px;
  }

  .app-stage {
    width: 100%;
    max-width: none;
  }

  .preview-hero .app-window {
    width: 100%;
  }
}

@media (max-width: 720px) {
  .home-preview .wrap {
    padding: 0 16px 56px;
  }

  nav.top {
    position: relative;
    top: auto;
    min-height: 66px;
    margin: 0;
    padding: 14px 0;
    border-bottom-color: rgba(255,255,255,.1);
  }

  .brand {
    position: relative;
    z-index: 2;
    font-size: 15px;
  }

  .brand-mark {
    width: 32px;
    height: 32px;
  }

  .nav-toggle {
    position: relative;
    z-index: 2;
    display: inline-flex;
    min-height: 40px;
    align-items: center;
    padding: 9px 13px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .08em;
    text-transform: uppercase;
  }

  .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-top: 10px;
    padding: 8px;
    border: 1px solid var(--line-strong);
    border-radius: 18px;
    background: rgba(14,14,17,.97);
    box-shadow: 0 24px 60px rgba(0,0,0,.42);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links > a {
    display: flex;
    min-height: 46px;
    align-items: center;
    padding: 0 14px;
    border-radius: 12px;
    font-size: 15px;
  }

  .nav-links > a.active,
  .nav-links > a:active {
    background: rgba(255,255,255,.07);
  }

  .lang-switch {
    width: 100%;
    justify-content: flex-start;
    margin: 6px 0 0;
    padding: 12px 14px 8px;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .preview-hero {
    min-height: auto;
    gap: 36px;
    padding: 42px 0 58px;
  }

  .preview-hero::before {
    width: 280px;
    height: 280px;
    right: -170px;
    top: 2%;
    filter: blur(64px);
  }

  .preview-hero::after {
    width: 220px;
    height: 220px;
    left: -150px;
    bottom: 20%;
    filter: blur(60px);
  }

  .hero-eyebrow {
    margin-bottom: 18px;
    font-size: 10px;
    letter-spacing: .14em;
  }

  .preview-hero h1 {
    max-width: 100%;
    font-size: clamp(3.25rem, 16.5vw, 5.15rem);
    line-height: .9;
    letter-spacing: -.068em;
    overflow-wrap: anywhere;
  }

  .preview-hero .hero-sub {
    margin: 24px 0 24px;
    font-size: 1rem;
    line-height: 1.58;
  }

  .preview-hero .cta-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .preview-hero .btn {
    width: 100%;
    min-height: 48px;
    padding: 13px 16px;
  }

  .hero-proof {
    display: grid;
    grid-template-columns: 1fr;
    gap: 9px;
    margin-top: 22px;
    font-size: 12px;
  }

  .preview-hero .app-stage {
    margin: 0;
  }

  .preview-hero .app-window {
    aspect-ratio: 760 / 540;
    border-radius: 18px;
    transform: none !important;
    box-shadow: 0 24px 65px rgba(0,0,0,.48);
  }

  .preview-hero .app-window::after {
    left: 10px;
    bottom: 10px;
    padding: 5px 8px;
    font-size: 8px;
  }

  .grace-product-shot {
    object-fit: cover;
    object-position: left top;
  }

  .agent-marquee {
    margin-bottom: 72px;
    padding: 16px 0;
  }

  .agent-track span {
    gap: 16px;
    margin-right: 24px;
    font-size: clamp(1.8rem, 10vw, 3rem);
  }

  .editorial-section {
    margin-bottom: 76px;
  }

  .section-head {
    gap: 16px;
    padding-bottom: 22px;
  }

  .section-head h2,
  .privacy-panel h2,
  .grace-identity-copy h2 {
    font-size: clamp(2.35rem, 12vw, 4.2rem);
    line-height: .94;
    letter-spacing: -.055em;
  }

  .feature-row {
    gap: 14px;
    padding: 28px 0;
  }

  .feature-name h3 {
    margin-bottom: 4px;
    font-size: clamp(1.7rem, 8.5vw, 2.5rem);
  }

  .feature-card {
    min-height: 0;
    padding: 22px 20px;
    border-radius: 18px;
  }

  .feature-card p {
    padding-right: 24px;
    font-size: 15px;
    line-height: 1.62;
  }

  .feature-card .card-link {
    right: 18px;
    top: 14px;
    font-size: 22px;
  }

  .grace-identity,
  .privacy-panel,
  .preview-cta {
    margin-bottom: 72px;
    padding: 22px;
    border-radius: 22px;
  }

  .grace-identity {
    gap: 26px;
  }

  .grace-identity-art {
    min-height: 390px;
    border-radius: 17px;
    background-position: center 15%;
  }

  .grace-identity-copy p {
    margin-top: 20px;
    font-size: 15px;
    line-height: 1.65;
  }

  .privacy-panel {
    gap: 26px;
  }

  .privacy-item {
    padding: 15px 0;
  }

  .privacy-item span {
    display: block;
    font-size: 14px;
    line-height: 1.5;
  }

  .preview-cta h2 {
    font-size: clamp(2.8rem, 14vw, 4.8rem);
    line-height: .88;
  }

  .preview-cta .cta-bottom {
    gap: 22px;
    margin-top: 28px;
    padding-top: 20px;
  }

  .preview-cta p {
    font-size: 15px;
    line-height: 1.55;
  }

  .preview-cta a {
    display: inline-flex;
    min-height: 44px;
    align-items: center;
  }

  footer {
    flex-direction: column;
    gap: 20px;
    margin-top: 32px;
    padding-top: 24px;
  }

  footer .footer-links {
    justify-content: flex-start;
    gap: 10px 12px;
  }
}

@media (max-width: 390px) {
  .home-preview .wrap {
    padding-inline: 14px;
  }

  .preview-hero h1 {
    font-size: clamp(3rem, 16vw, 4rem);
  }

  .grace-identity-art {
    min-height: 340px;
  }

  .grace-identity,
  .privacy-panel,
  .preview-cta {
    padding: 18px;
  }
}