/* ============================================================
   Ka Kalıp Kauçuk — Responsive Stylesheet
   Mobile-first breakpoints
   ============================================================ */

/* Breakpoints:
   sm:  640px
   md:  768px
   lg:  1024px
   xl:  1280px
*/

/* ============================================================
   LARGE (Desktop, >1280px)
   ============================================================ */
@media (min-width: 1280px) {
  :root {
    --container-pad: 2rem;
  }
}

/* ============================================================
   MEDIUM-LARGE (Tablet Landscape / Small Desktop, 1024px-1279px)
   ============================================================ */
@media (max-width: 1279px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

/* ============================================================
   MEDIUM (Tablet Portrait, 768px-1023px)
   ============================================================ */
@media (max-width: 1023px) {
  /* Typography */
  h1 { font-size: var(--text-3xl); }
  .section-title { font-size: var(--text-3xl); }

  /* Header */
  .site-nav { display: none; }
  .header-actions .btn { display: none; }
  .hamburger { display: flex; }

  /* Hero */
  .hero-stats {
    gap: var(--space-6);
  }

  /* About Split */
  .about-split {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }
  .about-split.reverse {
    direction: ltr;
  }

  /* Product Detail */
  .product-detail-grid {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }
  .product-gallery {
    position: static;
  }

  /* Contact */
  .contact-section {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }

  /* CTA Banner */
  .cta-banner-inner {
    flex-direction: column;
    text-align: center;
  }

  .cta-banner-text p {
    margin: 0 auto;
  }

  /* Stats */
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stat-card:nth-child(2) {
    border-right: none;
  }
  .stat-card:nth-child(odd) {
    border-right: 1px solid var(--color-border);
  }
  .stat-card:last-child {
    border-right: none;
  }

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

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

  /* Form */
  .form-grid {
    grid-template-columns: 1fr;
  }
  .form-group.full-width {
    grid-column: 1;
  }
}

/* ============================================================
   SMALL (Mobile, <768px)
   ============================================================ */
@media (max-width: 767px) {
  :root {
    --header-h: 68px;
    --container-pad: 1.25rem;
  }

  /* Typography */
  h1 { font-size: var(--text-2xl); }
  h2 { font-size: var(--text-2xl); }
  .section-title { font-size: var(--text-2xl); }
  .section-subtitle { font-size: var(--text-base); }

  /* Section padding */
  .section { padding: var(--space-12) 0; }

  /* Hero */
  .hero {
    min-height: auto;
    padding-top: var(--header-h);
  }

  .hero-content {
    padding: var(--space-12) 0 var(--space-8);
  }

  .hero h1 {
    font-size: clamp(1.75rem, 7vw, 2.5rem);
  }

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

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

  .hero-stats {
    gap: var(--space-6);
    margin-top: var(--space-8);
    padding-top: var(--space-8);
  }

  .hero-stat-value {
    font-size: var(--text-2xl);
  }

  /* Trust Bar */
  .trust-bar-inner {
    flex-direction: column;
    gap: var(--space-4);
    align-items: flex-start;
  }
  .trust-divider { display: none; }

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

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

  /* Stats */
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stat-card {
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }
  .stat-card:last-child {
    border-bottom: none;
  }

  /* CTA Banner */
  .cta-banner-inner {
    flex-direction: column;
    text-align: center;
    gap: var(--space-6);
  }

  .cta-banner-text h2 {
    font-size: var(--text-2xl);
  }

  .cta-banner-actions {
    width: 100%;
  }

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

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

  /* Footer */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .footer-brand {
    grid-column: 1;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
  }

  /* Floating CTA */
  .floating-cta {
    display: block;
    bottom: var(--space-4);
    right: var(--space-4);
  }

  .floating-cta .btn {
    padding: 0.875rem 1.25rem;
    font-size: var(--text-xs);
    border-radius: var(--radius-full);
  }

  /* References Grid */
  .refs-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Contact */
  .contact-form {
    padding: var(--space-6);
  }

  /* Process */
  .process-item {
    grid-template-columns: 50px 1fr;
    gap: var(--space-4);
  }

  .process-number {
    width: 44px; height: 44px;
    font-size: var(--text-base);
  }

  .process-item::before {
    left: 25px;
  }

  /* Scroll top */
  .scroll-top {
    bottom: var(--space-4);
    left: var(--space-4);
  }

  /* Page hero */
  .page-hero {
    padding: calc(var(--header-h) + var(--space-10)) 0 var(--space-10);
  }

  /* About split */
  .about-split {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

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

  /* Cert cards */
  .cert-cards {
    grid-template-columns: 1fr;
  }

  /* Section header */
  .section-header {
    margin-bottom: var(--space-8);
  }

  /* Contact detail */
  .contact-section {
    gap: var(--space-8);
  }

  /* Mobile nav lang */
  .header-actions .lang-switcher {
    display: none;
  }
}

/* ============================================================
   EXTRA SMALL (320px)
   ============================================================ */
@media (max-width: 399px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .stat-card {
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }

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

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

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

/* ============================================================
   PRINT
   ============================================================ */
@media print {
  .site-header,
  .floating-cta,
  .scroll-top,
  .mobile-nav {
    display: none !important;
  }

  body {
    color: #000;
    background: #fff;
  }

  a {
    text-decoration: underline;
  }
}