/* ============================================================
   KIIT-СЕРВИС — Responsive
   ============================================================ */

/* Tablet and below */
@media (max-width: 1024px) {
  :root {
    --header-h: 64px;
    --container-pad: 20px;
  }

  /* Hide desktop nav, show burger */
  .main-nav { display: none; }
  .header-phone { display: none; }
  .burger { display: flex; }

  /* Mobile nav drawer */
  .mobile-nav {
    display: block;
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    max-width: 360px;
    height: 100vh;
    background: var(--white);
    z-index: 200;
    transform: translateX(100%);
    transition: transform var(--t-base);
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    padding: var(--space-6) var(--space-5);
  }
  .mobile-nav.open { transform: translateX(0); }
  .mobile-nav-close {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--steel-100);
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .mobile-nav-close svg { width: 18px; height: 18px; color: var(--steel-700); }
  .mobile-nav-header {
    padding-bottom: var(--space-5);
    margin-bottom: var(--space-5);
    border-bottom: 1px solid var(--steel-300);
  }
  .mobile-nav-phone {
    font-size: 22px;
    font-weight: 800;
    color: var(--steel-900);
    display: block;
    margin-bottom: 4px;
  }
  .mobile-nav-label {
    font-size: 12px;
    color: var(--steel-600);
    letter-spacing: 0.04em;
    text-transform: uppercase;
  }
  .mobile-nav-link {
    display: block;
    padding: var(--space-3) 0;
    font-size: 16px;
    font-weight: 600;
    color: var(--steel-800);
    border-bottom: 1px solid var(--steel-200);
  }
  .mobile-nav-link:hover { color: var(--brand); }
  .mobile-nav-cta {
    margin-top: var(--space-5);
    width: 100%;
  }
  .mobile-nav-sub {
    padding-left: var(--space-4);
    font-size: 14px;
    color: var(--steel-600);
  }

  .nav-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(11, 30, 63, 0.5);
    z-index: 150;
    opacity: 0;
    visibility: hidden;
    transition: all var(--t-base);
  }
  .nav-backdrop.open { opacity: 1; visibility: visible; }

  /* Hero */
  .hero-grid { grid-template-columns: 1fr; gap: var(--space-8); }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: var(--space-4); }

  /* Trust strip */
  .trust-strip-grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-4); }

  /* Grids */
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .clients-grid { grid-template-columns: repeat(3, 1fr); }

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

  /* Footer */
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-6); }

  /* Section padding */
  .section { padding: var(--space-16) 0; }
  .section-lg { padding: var(--space-16) 0; }
}

/* Mobile */
@media (max-width: 640px) {
  :root { --container-pad: 16px; }

  h1 { font-size: 32px; }
  h2 { font-size: 26px; }
  h3 { font-size: 22px; }
  .lead { font-size: 17px; }

  /* Hero adjustments */
  .hero { padding: var(--space-12) 0 var(--space-16); }
  .hero h1 { font-size: 32px; line-height: 1.15; }
  .hero-subtitle { font-size: 17px; }
  .hero-cta-group { flex-direction: column; align-items: stretch; }
  .hero-cta-group .btn { width: 100%; }
  .hero-stats { grid-template-columns: 1fr 1fr; }
  .hero-stat-num { font-size: 26px; }

  /* Trust strip */
  .trust-strip-grid { grid-template-columns: 1fr; gap: var(--space-3); }

  /* Grids to single column */
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .clients-grid { grid-template-columns: repeat(2, 1fr); }

  /* Steps */
  .steps { grid-template-columns: 1fr; }

  /* Footer */
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }

  /* Forms */
  .form-row { grid-template-columns: 1fr; }
  .form-card { padding: var(--space-5); }

  /* CTA block */
  .cta-block { padding: var(--space-8) var(--space-5); }
  .cta-block .btn-group { flex-direction: column; }
  .cta-block .btn-group .btn { width: 100%; }

  /* Trust bar */
  .trust-bar-items { gap: var(--space-3); font-size: 12px; }
  .trust-bar-item { font-size: 12px; }

  /* Logo */
  .logo-text { display: none; }
  .logo-img { height: 40px; }

  /* Section padding */
  .section { padding: var(--space-12) 0; }
  .section-lg { padding: var(--space-16) 0; }
  .section-sm { padding: var(--space-10) 0; }

  /* Tables */
  table.data { font-size: 13px; }
  table.data th, table.data td { padding: var(--space-2) var(--space-3); }

  /* Case/Service cards */
  .service-card-image, .case-card-image { height: 180px; }
}