/* ============================================
   MOBILE MENU OVERLAY
============================================ */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(8,8,8,0.98);
  backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s ease;
}
.mobile-menu.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.mobile-close {
  position: absolute;
  top: 20px;
  right: 20px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-dim);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  font-weight: 600;
  padding: 8px 14px;
  cursor: pointer;
  transition: all 0.15s ease;
}
.mobile-close:hover {
  color: var(--text);
  border-color: var(--text-dim);
}

.mobile-nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
}
.mobile-nav-link {
  font-size: 18px;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  font-weight: 600;
  transition: color 0.15s ease;
}
.mobile-nav-link:hover,
.mobile-nav-link:active { color: var(--text); }

/* ============================================
   TABLET — 900px
============================================ */
@media (max-width: 900px) {
  .about-grid   { grid-template-columns: 1fr; gap: 36px; }
  .edu-grid     { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-stats   { grid-template-columns: repeat(2, 1fr); }
  .stat         { border-bottom: 1px solid var(--border-soft); }
  .stat:nth-child(3),
  .stat:nth-child(4) { border-bottom: none; }
  .stat:nth-child(2) { border-right: none; }
}

/* ============================================
   MOBILE — 768px
============================================ */
@media (max-width: 768px) {
  .nav-links  { display: none; }
  .hamburger  { display: flex; }

  .nav-inner      { padding: 14px 20px; }
  .section-inner  { padding: 0 20px; }
  section         { padding: 60px 0; }

  .hero           { padding-top: 88px; padding-bottom: 60px; }
  .hero-title     { font-size: 40px; }
  .hero-actions   { flex-direction: column; gap: 10px; margin-bottom: 48px; }
  .hero-actions .btn { justify-content: center; width: 100%; }
  .hero-stats     { grid-template-columns: repeat(2, 1fr); }

  .section-title  { font-size: 22px; }

  .writeup-card {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 22px 0;
  }

  .form-row { grid-template-columns: 1fr; gap: 18px; }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
}

/* ============================================
   SMALL MOBILE — 420px
============================================ */
@media (max-width: 420px) {
  .hero-title  { font-size: 32px; }
  .hero-stats  { grid-template-columns: 1fr 1fr; }
  .hero-socials .hero-social-btn { font-size: 10px; padding: 6px 11px; }
}