/* ============================================================
   Dr. Honey Yadav — Academic Portfolio
   css/responsive.css — Responsive Breakpoints
   ============================================================ */

/* ── Large Desktop ≤ 1440px ─────────────────────────────────── */
@media (max-width: 1440px) {
  h1 { font-size: 2.9rem; }
  .hero-portrait-placeholder,
  .hero-portrait { width: 300px; height: 300px; }
  .chip-iit  { left: -5%; }
  .chip-bcu  { right: -2%; }
  .chip-ukri { left: -5%; }
}

/* ── Laptop ≤ 1200px ─────────────────────────────────────────── */
@media (max-width: 1200px) {
  h1 { font-size: 2.5rem; }
  h2 { font-size: 1.9rem; }
  .nav-links a { font-size: .78rem; padding: .4rem .55rem; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .expertise-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-portrait-placeholder,
  .hero-portrait { width: 260px; height: 260px; }
  .chip-iit  { top: 5%; left: -2%; font-size: .65rem; padding: .3rem .6rem; }
  .chip-bcu  { display: none; }
  .chip-ukri { top: 35%; left: -2%; font-size: .65rem; padding: .3rem .6rem; }
  .chip-gtv  { top: 60%; left: -2%; font-size: .65rem; padding: .3rem .6rem; }
  .chip-iim  { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid > *:first-child { grid-column: span 2; }
}

/* ── Tablet ≤ 992px ──────────────────────────────────────────── */
@media (max-width: 992px) {
  html { font-size: 17px; }

  /* Nav */
  .nav-links { display: none; }
  .nav-socials, .nav-divider { display: none; }
  .nav-toggle { display: flex; }

  /* Hero */
  #hero { padding: 4rem 0 3rem; min-height: auto; }
  #hero .row { flex-direction: column-reverse; }
  .hero-portrait-wrap { margin-bottom: 2.5rem; }
  .hero-statement { max-width: 100%; }

  /* Portrait */
  .hero-portrait-placeholder,
  .hero-portrait { width: 220px; height: 220px; }
  .hero-portrait-ring::before,
  .hero-portrait-ring::after { display: none; }

  /* Hide all chips on tablet */
  .chip-iit,
  .chip-bcu,
  .chip-ukri,
  .chip-gtv,
  .chip-iim { display: none; }

  /* About */
  #about .row { flex-direction: column; }
  .about-img-wrap { margin-bottom: 3rem; }
  .about-credential { right: 1rem; bottom: -1rem; }

  /* Grids */
  .research-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: repeat(2, 1fr); }

  /* Impact */
  #impact .row { flex-direction: column; }
  .impact-keywords { margin-top: 2rem; }

  /* Footer */
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
  .footer-grid > *:first-child { grid-column: span 1; }
}

/* ── Mobile ≤ 768px ──────────────────────────────────────────── */
@media (max-width: 768px) {
  html { font-size: 16px; }
  h1 { font-size: 2rem; }
  h2 { font-size: 1.6rem; }
  h3 { font-size: 1.2rem; }
  .section-header { margin-bottom: 2rem; }

  /* Hero */
  #hero { padding: 3rem 0 2.5rem; }
  .hero-actions { gap: .5rem; }
  .hero-actions .btn-primary-custom,
  .hero-actions .btn-outline-custom,
  .hero-actions .btn-ghost-custom {
    font-size: .82rem;
    padding: .62rem 1.1rem;
  }
  .hero-portrait-placeholder,
  .hero-portrait { width: 200px; height: 200px; }
  .hero-portrait-ring::before,
  .hero-portrait-ring::after { display: none; }
  .hero-badges { display: none; }

  /* Hide all chips on mobile */
  .chip-iit,
  .chip-bcu,
  .chip-ukri,
  .chip-gtv,
  .chip-iim { display: none; }

  /* Grids */
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 1rem; }
  .stat-card { padding: 1.5rem 1rem; }
  .stat-number { font-size: 2rem; }
  .expertise-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .research-grid { grid-template-columns: 1fr; }

  /* Publications */
  .pub-card { padding: 1.25rem; }

  /* Collab */
  .collab-types { gap: .4rem; }

  /* Footer */
  .footer-bottom { flex-direction: column; text-align: center; gap: .3rem; }
}

/* ── Small Mobile ≤ 375px ────────────────────────────────────── */
@media (max-width: 375px) {
  html { font-size: 15px; }
  .nav-inner { padding: 0 1rem; }
  #hero .container,
  #stats .container,
  #about .container { padding: 0 1rem; }
  h1 { font-size: 1.75rem; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .hero-portrait-placeholder,
  .hero-portrait { width: 160px; height: 160px; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn-primary-custom,
  .hero-actions .btn-outline-custom {
    width: 100%;
    justify-content: center;
  }
}

/* ── Reduced Motion ──────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
  [data-aos] {
    opacity: 1 !important;
    transform: none !important;
  }
}

/* ── Print ───────────────────────────────────────────────────── */
@media print {
  #mainNav, #collaborate, .hero-shapes, .hero-grid,
  .hero-portrait-ring::before, .hero-portrait-ring::after { display: none; }
  body { background: #fff; font-size: 12pt; }
  #hero { min-height: auto; padding: 1rem 0; }
}