/* ═══════════════════════════════════════════════
   BSPL — RESPONSIVE STYLES
   responsive.css
   ═══════════════════════════════════════════════ */

/* ── Large desktop (≤1440px) ───────────────────── */
@media (max-width: 1440px) {
  .hero-chip-1 { left: -2%; }
  .hero-chip-2 { right: -2%; }
  .hero-chip-3 { left: -2%; }
  .hero-chip-4 { right: -2%; }
}

/* ── Laptop (≤1280px) ──────────────────────────── */
@media (max-width: 1280px) {
  .hero-heading { font-size: clamp(2.25rem, 4.5vw, 3.5rem); }
  .nav-links { gap: 2px; }
  .nav-link { padding: 6px 9px; font-size: 13.5px; }

  .hero-chip { display: none; }
  .ecosystem-connectors { display: none; }
  .platform-ecosystem { gap: var(--space-6); }
  .ecosystem-node-card { width: 190px; }
}

/* ── Tablet landscape (≤1024px) ────────────────── */
@media (max-width: 1024px) {
  /* Nav */
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  #nav-cta { display: none; }

  /* Hero */
  .hero-container {
    grid-template-columns: 1fr;
    gap: var(--space-12);
    text-align: center;
  }
  .hero-subheading { margin-inline: auto; }
  .hero-actions { justify-content: center; }
  .hero-data-strip { margin-inline: auto; }
  .hero-visual { order: -1; }
  .hero-illustration-wrapper { width: min(400px, 80vw); }

  /* About */
  .about-grid {
    grid-template-columns: 1fr;
    gap: var(--space-12);
  }
  .about-visual { display: flex; justify-content: center; }
  .about-visual-card { max-width: 320px; }
  .about-stat-chip-1 { left: -10px; bottom: 20px; }
  .about-stat-chip-2 { right: -10px; top: 20px; }
  .about-content { padding-left: 0; text-align: center; }
  .about-pillars { align-items: flex-start; }
  .about-cta { width: 100%; justify-content: center; }

  /* Verticals */
  .verticals-grid { grid-template-columns: 1fr; gap: var(--space-5); }

  /* Platform */
  .platform-ecosystem {
    flex-direction: column;
    align-items: center;
  }
  .node-ai, .node-biology, .node-molecular { order: 1; }
  .ecosystem-hub { order: 0; margin-bottom: var(--space-4); }
  .ecosystem-node-card { width: 280px; }

  /* Technologies */
  .tech-grid { grid-template-columns: repeat(2, 1fr); }

  /* Industries */
  .industries-grid { grid-template-columns: repeat(2, 1fr); }

  /* Why */
  .why-grid { grid-template-columns: 1fr; }
  .why-stats-bar { gap: var(--space-6); padding: var(--space-6) var(--space-8); }

  /* Footer */
  .footer-top { grid-template-columns: 1fr; gap: var(--space-10); }
  .footer-links-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ── Tablet portrait (≤768px) ──────────────────── */
@media (max-width: 768px) {
  /* Typography */
  h1 { font-size: clamp(2rem, 8vw, 2.75rem); letter-spacing: -0.03em; }
  h2 { font-size: clamp(1.5rem, 6vw, 2.25rem); }

  /* Section padding */
  .about-section,
  .verticals-section,
  .platform-section,
  .tech-section,
  .industries-section,
  .why-section,
  .cta-section,
  .site-footer { padding-block: var(--space-20); }

  /* Hero */
  .hero-section { padding-block: 100px 60px; }
  .hero-data-strip {
    gap: var(--space-4);
    flex-wrap: wrap;
    justify-content: center;
    padding: var(--space-4);
  }
  .data-divider { display: none; }

  /* Tech grid */
  .tech-grid { grid-template-columns: 1fr; }

  /* Industries */
  .industries-grid { grid-template-columns: 1fr; }

  /* Why stats */
  .why-stats-bar { flex-direction: column; gap: var(--space-5); padding: var(--space-6); }
  .why-stat-divider { width: 60px; height: 1px; }
  .why-grid { grid-template-columns: 1fr; }

  /* Platform benefits */
  .platform-benefits { flex-direction: column; gap: var(--space-5); padding: var(--space-6); }
  .platform-benefit-divider { width: 60px; height: 1px; }

  /* CTA */
  .cta-actions { flex-direction: column; align-items: center; }
  .cta-actions .btn { width: 100%; max-width: 300px; justify-content: center; }
  .cta-contact-strip { flex-direction: column; gap: var(--space-3); }
  .cta-contact-divider { display: none; }

  /* Footer */
  .footer-links-grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-6); }
  .footer-bottom { flex-direction: column; align-items: flex-start; gap: var(--space-3); }
}

/* ── Phone (≤480px) ────────────────────────────── */
@media (max-width: 480px) {
  /* Touch target & button optimization */
  .btn {
    min-height: 48px;
    padding-block: 12px;
  }
  .hero-actions { flex-direction: column; align-items: center; width: 100%; }
  .hero-actions .btn { width: 100%; justify-content: center; }

  /* Mobile menu full-screen */
  /* Mobile menu full-screen adjustments */
  .mobile-menu {
    width: 100vw;
    height: 100vh;
    max-height: none;
    border-radius: 0;
    padding: var(--space-6);
    overflow-y: auto;
  }
  .mobile-overlay { background: rgba(15, 23, 42, 0.5); }

  /* Section headings & text */
  .section-heading { font-size: clamp(1.5rem, 7vw, 1.875rem); }
  .section-descriptor { font-size: 15px; }

  .bioisotope-img-stats {
    flex-wrap: wrap;
    gap: var(--space-3);
    justify-content: center;
  }

  /* Footer links */
  .footer-links-grid { grid-template-columns: 1fr 1fr; gap: var(--space-6) var(--space-4); }
  .footer-link { padding-block: 6px; display: inline-block; }
  .footer-legal { gap: var(--space-4); flex-wrap: wrap; }
}

/* ── Ultra small (≤375px) ──────────────────────── */
@media (max-width: 375px) {
  .container { padding-inline: var(--space-4); }
  .footer-links-grid { grid-template-columns: 1fr; }
  .oxyaasn-stats-grid { grid-template-columns: 1fr; }
  .btn { font-size: 14px; }
}

/* ── Touch target safety ───────────────────────── */
@media (hover: none) {
  .vertical-card:hover,
  .tech-card:hover,
  .industry-card:hover,
  .why-card:hover {
    transform: none;
  }
  .btn:hover { transform: none; }
}