/* ============================================================
   RichChip Website — responsive.css
   Breakpoints: <576 | 576–768 | 768–1024 | >1024
   ============================================================ */

/* ── Tablet: ≤ 1024px ──────────────────────────────────────── */
@media (max-width: 1024px) {
  :root {
    --section-pad: 80px;
  }

  .navbar .nav-links,
  .navbar .nav-right .btn {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .mobile-nav {
    display: flex;
  }

  /* Hero */
  .hero-title {
    font-size: clamp(2rem, 4.5vw, 3.25rem);
  }

  /* Brand */
  .brand-cards {
    grid-template-columns: 1fr 1fr;
  }

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

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

  .tech-left .section-subtitle {
    max-width: 600px;
  }

  /* RSM Metrics */
  .rsm-metrics {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  /* Roadmap */
  .roadmap-name {
    font-size: 0.78rem;
    max-width: 110px;
  }

  .roadmap-track::before {
    left: 30px;
    right: 30px;
  }
}

/* ── Small Tablet / Large Phone: ≤ 768px ───────────────────── */
@media (max-width: 768px) {
  :root {
    --section-pad: 64px;
  }

  .section-title {
    font-size: clamp(1.5rem, 4vw, 2rem);
  }

  /* Hero */
  .hero-arrows {
    display: none;
  }

  .hero-content {
    padding-right: 24px;
  }

  /* Brand */
  .brand-cards {
    grid-template-columns: 1fr;
  }

  .brand-dna {
    gap: 10px;
  }

  /* Products */
  .products-grid {
    grid-template-columns: 1fr;
  }

  /* RSM Flow */
  .rsm-flow {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .rsm-arrow {
    transform: rotate(90deg);
    margin: 4px auto;
  }

  .rsm-step {
    flex-direction: column;
    width: 100%;
  }

  .rsm-step-box {
    width: 100%;
    text-align: left;
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 16px;
  }

  .rsm-step-icon {
    margin: 0;
    flex-shrink: 0;
  }

  /* Use Cases */
  .usecases-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Roadmap — switch to vertical */
  .roadmap-track {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 0 0 0 28px;
  }

  .roadmap-track::before {
    top: 24px;
    bottom: 24px;
    left: 24px;
    right: auto;
    width: 2px;
    height: auto;
    background: linear-gradient(180deg, var(--rich-blue), var(--privacy-cyan), var(--text-muted));
  }

  .roadmap-node {
    flex-direction: row;
    align-items: flex-start;
    text-align: left;
    margin-bottom: 32px;
    gap: 16px;
  }

  .roadmap-dot {
    margin-bottom: 0;
    flex-shrink: 0;
  }

  .roadmap-name {
    max-width: none;
  }

  .roadmap-stages {
    grid-template-columns: 1fr;
  }

  /* Contact */
  .contact-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  /* Footer */
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* ── Mobile: ≤ 576px ───────────────────────────────────────── */
@media (max-width: 576px) {
  :root {
    --section-pad: 48px;
    --nav-height: 64px;
  }

  .container {
    padding: 0 16px;
  }

  /* Hero */
  .hero-title {
    font-size: 1.85rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .hero-cta {
    flex-direction: column;
  }

  .hero-cta .btn {
    width: 100%;
    justify-content: center;
  }

  /* Brand DNA */
  .brand-dna {
    flex-direction: column;
    align-items: flex-start;
  }

  /* Products filter */
  .filter-bar {
    gap: 6px;
  }

  .filter-btn {
    padding: 6px 14px;
    font-size: 0.8rem;
  }

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

  /* RSM metrics */
  .rsm-metrics {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Use Cases */
  .usecases-grid {
    grid-template-columns: 1fr;
  }

  /* Partnership */
  .partnership-grid {
    grid-template-columns: 1fr;
  }

  /* Contact form */
  .contact-form {
    padding: 24px 16px;
  }

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

  .footer-socials {
    display: flex;
    gap: 10px;
  }

  /* Product pages */
  .features-grid {
    grid-template-columns: 1fr;
  }

  .product-hero-title {
    font-size: 2rem;
  }

  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }

  .cta-buttons .btn {
    width: 100%;
    max-width: 320px;
    justify-content: center;
  }

  .back-to-top {
    right: 16px;
    bottom: 16px;
    width: 40px;
    height: 40px;
  }
}

/* ── Large Desktop: > 1440px ───────────────────────────────── */
@media (min-width: 1440px) {
  :root {
    --section-pad: 120px;
  }

  .hero-title {
    font-size: 4.5rem;
  }

  .section-title {
    font-size: 3rem;
  }
}