/* ============================================
   RESPONSIVE — Breakpoints & Mobile Navigation
   ============================================ */

/* ── Hamburger Toggle (hidden on desktop) ── */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: var(--z-nav);
}
.menu-toggle span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--c-text-strong);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

/* ── Tablet (< 1100px) ── */
@media (max-width: 1100px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ── Mobile Nav + Layout (< 900px) ── */
@media (max-width: 900px) {
  :root {
    --page-gutter: 1.5rem;
  }

  header { padding: 1rem var(--page-gutter); }

  /* Show hamburger */
  .menu-toggle { display: flex; }

  /* Nav becomes fullscreen overlay */
  nav {
    position: fixed;
    inset: 0;
    background: var(--c-glass-full);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding-top: 5rem;
    gap: 2.5rem;
    z-index: var(--z-header);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
  }
  nav.open {
    opacity: 1;
    pointer-events: all;
  }
  nav a {
    font-size: 1.1rem;
    letter-spacing: 0.2em;
    color: var(--c-text);
  }
  nav a::after { display: none; }
  nav a:hover { color: var(--c-accent); }

  /* Hamburger → X animation */
  body.nav-open .menu-toggle span:nth-child(1) {
    transform: rotate(45deg) translate(4.5px, 4.5px);
  }
  body.nav-open .menu-toggle span:nth-child(2) {
    opacity: 0;
  }
  body.nav-open .menu-toggle span:nth-child(3) {
    transform: rotate(-45deg) translate(4.5px, -4.5px);
  }

  /* Hero */
  .hero {
    padding: 0 var(--page-gutter) 4rem;
  }
  .hero-scroll { display: none; }
  .hero-spacer { height: 80vh; }

  /* Grids → single column */
  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .about-grid { gap: 2rem; }
  .contact-grid { gap: 3rem; }

  .services-grid {
    grid-template-columns: 1fr;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }
  .project-card,
  .project-card:nth-child(n) {
    aspect-ratio: 16/10;
  }

  /* Process — single column on mobile */
  .process-timeline::before {
    left: 20px;
    transform: none;
  }
  .process-step,
  .step-left,
  .step-right {
    width: 100%;
    margin-left: 0;
    padding-left: 3rem;
    padding-right: 0;
    text-align: left;
  }
  .process-step::before {
    left: 14px !important;
    right: auto !important;
  }
  .process-step::after {
    display: none;
  }
  .step-left .step-card {
    margin-left: 0;
  }
  .step-left.reveal,
  .step-right.reveal {
    transform: translateY(40px) translateX(0);
  }

  /* Footer stack */
  footer {
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
  }

  /* Hide custom cursor */
  .cursor-dot,
  .cursor-ring {
    display: none;
  }
}

/* ── Small Mobile (< 480px) ── */
@media (max-width: 480px) {
  :root {
    --page-gutter: 1rem;
  }

  /* Hero */
  .hero {
    padding: 0 var(--page-gutter) 2.5rem;
  }
  .hero h1 {
    font-size: clamp(2rem, 10vw, 3.5rem);
  }
  .hero-tag {
    font-size: 0.55rem;
    letter-spacing: 0.2em;
  }

  /* Section titles smaller */
  .section-title {
    font-size: clamp(1.6rem, 8vw, 2.5rem);
    margin-bottom: 1.5rem;
  }
  .section-tag {
    font-size: 0.55rem;
    gap: 0.6rem;
  }
  .section-tag::before { width: 20px; }

  /* About */
  .about-text p.lead {
    font-size: 1.1rem;
  }
  .about-stats {
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }
  .stat-number {
    font-size: 2.2rem;
  }

  /* Services */
  .service-card {
    padding: 2rem 1.5rem;
  }
  .service-title {
    font-size: 1.2rem;
  }
  .service-icon {
    width: 35px;
    height: 35px;
    margin-bottom: 1.5rem;
  }

  /* Process */
  .step-card h3 {
    font-size: 1.2rem;
  }
  .step-card p {
    font-size: 0.8rem;
  }

  /* Quote */
  .quote-text {
    font-size: clamp(1.1rem, 5vw, 1.6rem);
  }
  .quote-text::before {
    font-size: 3.5rem;
    top: -1.2rem;
    left: -0.3rem;
  }
  .quote-section {
    padding-left: var(--page-gutter);
    padding-right: var(--page-gutter);
  }

  /* Projects */
  .project-info {
    padding: 1.2rem;
  }
  .project-name {
    font-size: 1.2rem;
  }
  .project-desc {
    font-size: 0.75rem;
  }

  /* Contact */
  .contact-submit {
    width: 100%;
    justify-content: center;
  }
  .contact-form input,
  .contact-form textarea {
    padding: 0.8rem 1rem;
    font-size: 0.8rem;
  }

  /* Marquee smaller */
  .marquee-item {
    font-size: 1rem;
    gap: 2rem;
  }
  .marquee-track {
    gap: 2rem;
  }

  /* CTA link */
  .cta-link {
    font-size: 1.5rem;
  }
}