/* ==========================================================================
   KAMFED ENGINEERING COMPANY LIMITED — RESPONSIVE STYLESHEET
   --------------------------------------------------------------------------
   Kept separate from style.css so mobile-specific tweaks are easy to find
   and edit without scrolling through the full desktop stylesheet.
   Breakpoints used: 1024px (tablet), 768px (large phone), 480px (phone)
   ========================================================================== */

/* --------------------------------------------------------------------------
   TABLET (<= 1024px)
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .cols-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .values-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer .container {
    grid-template-columns: 1fr 1fr;
  }

  .hero-content h1 {
    font-size: 36px;
  }
}

/* --------------------------------------------------------------------------
   LARGE PHONE / SMALL TABLET (<= 768px)
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  :root {
    --header-height: 96px;
  }

  /* Top contact bar: stack phone numbers above email, centered */
  .topbar .container {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  /* Collapsible mobile navigation */
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: var(--space-sm) var(--space-md);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.08);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.2s ease, opacity 0.2s ease;
  }

  .nav-links.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-links a {
    width: 100%;
    padding: 12px 0;
    border-bottom: 1px solid var(--color-light-gray);
  }

  .nav-actions .nav-cta {
    display: none; /* the "Download Profile" button lives inside the mobile menu instead */
  }

  .nav-links .nav-cta-mobile {
    display: inline-block;
    margin-top: var(--space-sm);
    background-color: var(--color-green);
    color: var(--color-white);
    padding: 10px 20px;
    border-radius: 6px;
    font-family: var(--font-heading);
    font-weight: 500;
  }

  /* Hero stacks vertically, image below text */
  .hero .container {
    grid-template-columns: 1fr;
    padding-top: var(--space-xl);
    padding-bottom: var(--space-xl);
    gap: var(--space-lg);
  }

  .hero-content h1 {
    font-size: 30px;
  }

  .hero-image {
    order: -1;
  }

  /* About section stacks */
  .about .container {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .cols-3,
  .cols-4 {
    grid-template-columns: 1fr 1fr;
  }

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

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

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

  .profile-download .container {
    flex-direction: column;
    text-align: center;
  }

  /* Contact section stacks, form appears above map on mobile order */
  .contact .container {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

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

  .footer .container {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
  }

  .section {
    padding: var(--space-xl) 0;
  }

  .section-header h2 {
    font-size: 26px;
  }
}

/* --------------------------------------------------------------------------
   PHONE (<= 480px)
   -------------------------------------------------------------------------- */
@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-sm);
  }

  .brand img {
    height: 38px;
  }

  .hero-content h1 {
    font-size: 26px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .cols-3,
  .cols-4,
  .values-grid,
  .gallery-grid {
    grid-template-columns: 1fr;
  }

  .footer .container {
    grid-template-columns: 1fr;
  }

  .projects-tabs {
    flex-wrap: wrap;
  }

  .floating-actions {
    right: var(--space-sm);
    bottom: var(--space-sm);
  }

  .floating-btn {
    width: 50px;
    height: 50px;
  }

  .contact-form {
    padding: var(--space-md);
  }
}