/* ── MOBILE FIRST — breakpoint ≤ 900px ── */
@media (max-width: 900px) {

  /* Header */
  header {
    padding: 0 24px;
  }

  nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 0.5px solid var(--border);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 0;
    z-index: 99;
  }

  nav.is-open {
    display: flex;
  }

  nav a {
    display: block;
    width: 100%;
    padding: 16px 24px;
    border-bottom: 0.5px solid var(--border);
    font-size: 13px;
  }

  nav ul {
    flex-direction: column;
    width: 100%;
    gap: 0;
  }

  nav ul li {
    width: 100%;
  }

  nav ul li a {
    display: block;
    width: 100%;
    padding: 16px 24px;
    border-bottom: 0.5px solid var(--border);
  }

  .nav-cta {
    border-radius: 0;
    padding: 16px 24px;
  }

  .nav-hamburger {
    display: flex;
  }

  /* Hero */
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .hero-left {
    padding: 60px 24px;
    border-right: none;
    border-bottom: 0.5px solid var(--border);
  }

  .hero-right {
    display: none;
  }

  /* Sections */
  section {
    padding: 64px 24px;
  }

  /* Problem */
  .problem-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  /* Solution */
  .solution-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  /* Operators */
  .operators-grid {
    grid-template-columns: 1fr;
  }

  .operator-col:first-child {
    border-right: none;
    border-bottom: 0.5px solid var(--border);
  }

  /* DPP */
  .dpp-layout {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  /* Case */
  .case-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  /* Pricing */
  .pricing-grid {
    grid-template-columns: 1fr;
  }

  .pricing-col {
    border-right: none;
    border-bottom: 0.5px solid var(--border);
  }

  .pricing-col:last-child {
    border-bottom: none;
  }

  /* Footer */
  footer {
    flex-direction: column;
    gap: 20px;
    padding: 40px 24px;
  }

  .footer-right {
    flex-wrap: wrap;
    gap: 16px;
  }

  /* Node content */
  .node-content {
    padding: 48px 24px;
  }

  /* CTA section */
  .section-cta {
    padding: 64px 24px;
  }
}

/* ── RTL + MOBILE ── */
@media (max-width: 900px) {
  html[dir="rtl"] nav {
    align-items: flex-end;
  }

  html[dir="rtl"] .hero-left {
    border-left: none;
    border-bottom: 0.5px solid var(--border);
    padding: 60px 24px;
  }

  html[dir="rtl"] .operator-col:first-child {
    border-left: none;
    border-bottom: 0.5px solid var(--border);
  }
}

/* ── BREADCRUMB ── */
@media (max-width: 900px) {
  .breadcrumb-nav {
    padding: 16px 20px 0;
  }
}

/* ── ARTICLE TWO-COLUMN ── */
@media (max-width: 900px) {
  .article-with-image {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .article-image {
    order: -1;
  }
}