@media (max-width: 500px) {
  .container {
    width: min(calc(100% - 24px), var(--max));
  }
  .nav-in {
    height: 66px;
  }
  .mark {
    width: 42px;
    height: 32px;
  }
  .cart {
    min-height: 46px;
    padding: 0 14px;
    display: flex;
    align-items: center;
  }
  .crumb {
    padding: 17px 0;
  }
  .hero {
    padding: 18px 0 52px;
  }
  .hero-grid {
    gap: 24px;
  }
  .hero-media {
    order: initial;
    border-radius: 20px;
  }
  .hero-media img {
    height: auto;
    aspect-ratio: 1.38;
    object-fit: cover;
  }
  .hero h1 {
    max-width: 100%;
    overflow-wrap: anywhere;
    font-size: clamp(34px, 9.6vw, 42px);
    line-height: 1.02;
  }
  .lead {
    font-size: 14px;
    line-height: 1.65;
  }
  .price {
    margin-top: 20px;
    font-size: 30px;
  }
  .buttons {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .button {
    min-height: 52px;
    padding: 0 12px;
    justify-content: center;
  }
  .trust {
    grid-template-columns: 1fr 1fr;
  }
  .trust div {
    min-height: 70px;
    padding: 13px;
  }
  .section {
    padding: 58px 0;
  }
  .intro {
    gap: 20px;
    margin-bottom: 30px;
  }
  .intro h2,
  .pdu h2,
  .tech h2 {
    font-size: 34px;
  }
  .intro p {
    font-size: 13px;
    line-height: 1.65;
  }
  .grid {
    grid-template-columns: 1fr;
  }
  .card {
    min-height: 0;
    padding: 22px;
    border-right: 0;
  }
  .card h3 {
    margin-top: 22px;
  }
  .pdu {
    padding: 22px;
    gap: 28px;
    border-radius: 20px;
  }
  .tech {
    gap: 32px;
  }
  .row {
    grid-template-columns: 1fr;
    gap: 4px;
    padding: 14px 0;
  }
  .links {
    grid-template-columns: 1fr 1fr;
  }
  .links a {
    min-height: 52px;
    display: flex;
    align-items: center;
  }
  .footer-in {
    gap: 10px;
  }
}

/* Shared typographic brand: the old placeholder mark is intentionally hidden. */
.brand {
  gap: 0;
  font-size: 20px;
  letter-spacing: -0.055em;
}
.brand::after {
  content: "";
  width: 6px;
  height: 6px;
  margin-left: 8px;
  border-radius: 50%;
  background: #23c75a;
  box-shadow: 0 0 0 4px rgba(35, 199, 90, 0.11);
}
.mark {
  display: none;
}

@media (max-width: 800px) {
  .proof-grid,
  .operations-grid,
  .safety-callout,
  .test-evidence,
  .faq-layout {
    grid-template-columns: 1fr;
  }
  .proof-heading {
    margin-bottom: 28px;
  }
  .connection-flow {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .connection-flow li:not(:last-child)::after {
    content: "↓";
    right: auto;
    left: 50%;
    top: auto;
    bottom: -25px;
    transform: translateX(-50%);
  }
  .operations-grid {
    gap: 10px;
  }
  .resource-links {
    grid-template-columns: 1fr 1fr;
  }
  .safety-callout {
    gap: 14px;
  }
  .test-evidence {
    gap: 18px;
  }
  .faq-layout {
    gap: 28px;
  }
  .faq-intro {
    position: static;
  }
}

@media (max-width: 500px) {
  .proof-heading h2,
  .faq-intro h2 {
    font-size: 32px;
  }
  .proof-heading p {
    font-size: 13px;
  }
  .proof-card,
  .operation-card {
    padding: 20px;
    border-radius: 16px;
  }
  .proof-card h3 {
    font-size: 21px;
  }
  .connection-flow li {
    padding: 16px;
  }
  .resource-links {
    grid-template-columns: 1fr;
  }
  .resource-link {
    min-height: 52px;
  }
  .safety-callout {
    padding: 22px 20px;
    border-radius: 16px;
  }
  .safety-callout h3 {
    font-size: 22px;
  }
  .test-evidence {
    padding: 20px;
    border-radius: 16px;
  }
  .evidence-metrics {
    grid-template-columns: 1fr 1fr;
  }
  .model-comparison th,
  .model-comparison td {
    padding: 12px;
  }
  .faq-list summary {
    padding: 17px 42px 17px 14px;
    font-size: 12px;
  }
  .faq-list summary::after {
    right: 14px;
  }
  .faq-answer {
    padding: 0 42px 18px 14px;
  }
}