/* =========================================
   RESPONSIVE — Tablet (max-width: 1024px)
   ========================================= */
@media (max-width: 1024px) {
  /* Hero */
  .hero-visual { display: none; }
  .hero-title { font-size: 42px; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }

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

  /* Products */
  .products-grid { grid-template-columns: repeat(3, 1fr); }

  /* Steps */
  .steps__grid { grid-template-columns: repeat(2, 1fr); }
  .steps__timeline { display: none; }
  .step { padding-top: 0; }

  /* Advantages — 2 per row on tablet */
  .adv-card { flex: 0 0 calc(50% - 8px); }

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

  /* Footer */
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }

  /* Product page */
  .product-grid { grid-template-columns: 1fr; gap: 32px; }
  .gallery { position: static; }
  .info-grid { grid-template-columns: 1fr; gap: 40px; }
  .related-grid { grid-template-columns: repeat(2, 1fr); }

  /* CTA banner */
  .cta-banner .cta-inner {
    flex-direction: column;
    text-align: center;
    padding: 40px 32px;
  }

  /* Portfolio page */
  .portfolio-grid--full { grid-template-columns: repeat(2, 1fr); }

  /* Catalog categories — keep 3 cols on tablet, same as desktop */
  .catalog-grid { gap: 24px; }

  /* Contacts page */
  .contacts-grid { grid-template-columns: 1fr; }
  .contacts-form-wrap { order: -1; }
  .requisites-grid { grid-template-columns: 1fr; }

  /* Mega menu: 2-column grid on narrow desktop */
  .mega-menu__product-grid { grid-template-columns: repeat(2, 1fr); }
}

/* =========================================
   RESPONSIVE — Small Tablet (max-width: 768px)
   ========================================= */
/* Layout requirements tablet */
@media (max-width: 900px) {
  .lreq-body { grid-template-columns: 1fr; gap: 36px; }
  .lreq-diagram-wrap { flex-direction: row; align-items: flex-start; gap: 28px; }
  .lreq-legend { flex-direction: row; flex-wrap: wrap; gap: 10px 20px; }
  .lreq-checklist__items { gap: 12px 16px; }
}

@media (max-width: 768px) {
  /* Business grid - 2 cols but tighter */
  .biz-grid,
  .biz-grid--3 { grid-template-columns: repeat(2, 1fr); gap: 12px; }

  /* Catalog categories — 2 cols on small tablet */
  .catalog-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }

  /* Products - 2 cols */
  .products-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }

  /* Footer */
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
  .footer-brand { grid-column: 1 / -1; }

  /* Filter tabs scroll */
  .filter-tabs {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    flex-wrap: nowrap;
    scrollbar-width: none;
    padding-bottom: 4px;
  }
  .filter-tabs::-webkit-scrollbar { display: none; }
  .filter-tab { white-space: nowrap; flex-shrink: 0; }

  /* Contacts */
  .contacts-cards { gap: 16px; }
  .contact-card { padding: 20px; }

  /* Delivery page — tablet */
  .dlv-hero__inner { flex-direction: column; gap: 32px; }
  .dlv-hero__illustration { display: none; }
  .dlv-methods { grid-template-columns: 1fr; }
  .dlv-pickup { grid-template-columns: 1fr; gap: 32px; }
  .dlv-carriers { grid-template-columns: repeat(2, 1fr); }
  .dlv-payment-cards { grid-template-columns: 1fr; }

  /* Nav hide at tablet */
  .nav { display: none; }
  .burger { display: flex; }

  /* Header — trim on tablet to prevent overflow */
  .header-email { display: none; }
  .header-messengers { display: none; }
  .header-right .btn-coral { display: none; }

  /* Mega menu: hidden on mobile/tablet */
  .mega-menu { display: none !important; }
}

/* =========================================
   RESPONSIVE — Mobile (max-width: 640px)
   ========================================= */
@media (max-width: 640px) {
  .container { padding: 0 16px; }

  /* Header */
  .nav { display: none; }
  .header-contacts { display: none; }
  .header-messengers { display: none; }
  .burger { display: flex; }
  .btn-callback span { display: none; }
  .btn-callback { padding: 8px 10px; }
  .header-right .btn-coral { display: none; }

  /* Floating messengers — smaller on mobile, tooltip hidden */
  .msg-float { right: 16px; gap: 8px; }
  .msg-float__btn { width: 46px; height: 46px; }
  .msg-float__btn::before { display: none; }

  /* Product simple (psi) mobile */
  .psi-form__row { grid-template-columns: 1fr; }
  .psi-contact-btn--phone { flex: none; width: 100%; }
  .psi-contacts__btns { flex-direction: column; }
  .psi-contact-btn--tg,
  .psi-contact-btn--max { justify-content: center; }

  /* FAQ section mobile */
  .faq-section { padding: 56px 0; }
  .faq-cols { grid-template-columns: 1fr; gap: 0; }
  .faq-col + .faq-col .faq-item:first-child { border-top: none; }
  .faq-q { font-size: 14px; padding: 16px 4px; }

  /* Layout requirements mobile */
  .lreq-section { padding: 56px 0; }
  .lreq-body { margin-top: 32px; }
  .lreq-diagram-wrap { flex-direction: row; align-items: flex-start; gap: 20px; }
  .lreq-legend { flex-wrap: wrap; flex-direction: row; gap: 8px 16px; }
  .lreq-cards { grid-template-columns: 1fr; }
  .lreq-checklist { flex-direction: column; align-items: flex-start; }
  .lreq-checklist__label { margin-bottom: 4px; }
  .lreq-checklist__items { flex-direction: column; gap: 8px; }
  .lreq-check { white-space: normal; }
  .lreq-cta { flex-direction: column; text-align: center; }
  .lreq-cta__text { align-items: center; }
  .lreq-cta .btn { width: 100%; text-align: center; }

  /* Delivery page — mobile */
  .dlv-hero { padding: 36px 0 28px; }
  .dlv-hero__title { font-size: 28px; letter-spacing: -0.5px; }
  .dlv-hero__desc { font-size: 15px; }
  .dlv-hero__chips { gap: 8px; }
  .dlv-method { padding: 24px 20px; }
  .dlv-carriers { grid-template-columns: 1fr; }
  .dlv-pickup__map { display: none; }
  .dlv-payment-card { padding: 24px 20px; }

  /* Hero */
  .hero { padding: 48px 0 64px; }
  .hero-title { font-size: 32px; letter-spacing: -1px; }
  .hero-desc { font-size: 16px; }
  .hero-stats { gap: 20px; flex-wrap: wrap; }
  .stat-value { font-size: 24px; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .hero-badge { white-space: normal; text-align: center; }

  /* Business grid */
  .biz-grid,
  .biz-grid--4,
  .biz-grid--3 { grid-template-columns: 1fr 1fr; gap: 10px; }
  .biz-card-visual { min-height: 120px; padding: 16px; }
  .biz-card-visual svg { width: 100px; }
  .biz-card-body,
  .biz-card-content { padding: 16px; }
  .biz-name { font-size: 14px; }
  .biz-desc { font-size: 12px; }

  /* Catalog categories */
  .catalog-section { padding: 48px 0; }
  .catalog-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .catalog-card-name { font-size: 14px; }

  /* Section headers */
  .section-title { font-size: 28px; }

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

  /* Steps */
  .how-section { padding: 64px 0; }
  .steps__grid { grid-template-columns: 1fr; gap: 32px; }
  .steps__timeline { display: none; }
  .step {
    flex-direction: row;
    text-align: left;
    padding: 0;
    gap: 20px;
    align-items: flex-start;
  }
  .step__icon {
    flex-shrink: 0;
    width: 64px;
    height: 64px;
    border-radius: 18px;
    margin-bottom: 0;
  }
  .step__icon svg { width: 36px; height: 36px; }
  .step__content { max-width: none; }
  .step__title { font-size: 16px; }
  .step__desc { font-size: 13px; }

  /* Advantages */
  .adv-section { padding: 48px 0; }
  .adv-card { flex: 0 0 100%; padding: 24px 20px; }
  .adv-card__number { font-size: 32px; top: 16px; right: 16px; }

  /* Portfolio */
  .portfolio-grid { grid-template-columns: 1fr 1fr; }

  /* CTA */
  .cta-inner { padding: 40px 24px; }
  .cta-title { font-size: 26px; }
  .cta-form { flex-direction: column; }

  /* Footer */
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 16px; text-align: center; }

  /* Product page */
  .product-title { font-size: 24px; }
  .product-meta { flex-wrap: wrap; gap: 12px; }
  .calc-options { gap: 6px; }
  .calc-opt { padding: 8px 14px; font-size: 13px; }
  .guarantees { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr; }
  .calc-actions { flex-direction: column; }
  .calc-actions .btn-coral,
  .calc-actions .btn-outline-dark { width: 100%; }

  /* Product carousel */
  .carousel-slide { width: 240px; }
  .carousel-slide img { height: 160px; }
  .carousel-btn { display: none; }
  .section-header-row { flex-direction: column; align-items: flex-start; gap: 8px; }

  /* SEO section */
  .seo-section { padding: 36px 0; }
  .seo-content,
  .seo-bottom-content { padding: 24px 20px; font-size: 14px; }

  /* Product simple */
  .product-simple-price { font-size: 26px; }
  .product-simple-actions { flex-direction: column; }
  .product-simple-actions .btn-coral-lg,
  .product-simple-actions .btn-outline-dark { width: 100%; text-align: center; }
  .product-simple-desc { padding: 16px 20px; }

  /* Gallery thumbs horizontal scroll */
  .gallery-thumbs {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .gallery-thumbs::-webkit-scrollbar { display: none; }
  .thumb { flex-shrink: 0; }

  /* CTA banner */
  .cta-banner .cta-inner { padding: 32px 24px; }
  .cta-banner .cta-inner h2 { font-size: 22px; }
  .cta-actions { flex-direction: column; width: 100%; }
  .cta-actions .btn-coral,
  .cta-actions .btn-ghost { width: 100%; text-align: center; }

  /* Modal */
  .modal { padding: 24px; }
  .modal h3 { font-size: 20px; }

  /* Business type hero */
  .btype-hero__title { font-size: 26px; }
  .products-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .products-grid--compact { grid-template-columns: 1fr; }

  /* Portfolio page */
  .portfolio-hero h1 { font-size: 28px; }
  .portfolio-grid--full { grid-template-columns: 1fr; }
  .filter-tabs { gap: 6px; }
  .filter-tab { padding: 8px 16px; font-size: 13px; }

  /* Contacts page */
  .contacts-hero h1 { font-size: 28px; }
  .contacts-form-card { padding: 24px; }
  .contacts-form .form-row--half { grid-template-columns: 1fr; }
  .messenger-links { flex-wrap: wrap; }
  #yandex-map { height: 280px; }

  /* 404 page */
  .error-404 { padding: 64px 0; }
  .error-404__code { font-size: 80px; }
  .error-404__title { font-size: 24px; }
  .error-404__actions { flex-direction: column; }
  .error-404__actions .btn { width: 100%; text-align: center; }

  /* Lightbox */
  .lightbox-prev,
  .lightbox-next { width: 40px; height: 40px; font-size: 20px; }
  .lightbox-close { width: 40px; height: 40px; }
}

@media (max-width: 480px) {
  .biz-grid,
  .biz-grid--4,
  .biz-grid--3 { grid-template-columns: 1fr; gap: 10px; }
}

/* =========================================
   RESPONSIVE — Extra Small (max-width: 390px)
   iPhone SE, small Android
   ========================================= */
@media (max-width: 390px) {
  .container { padding: 0 12px; }

  /* Hero */
  .hero-title { font-size: 26px; }
  .hero-desc { font-size: 15px; }
  .stat-value { font-size: 20px; }
  .stat-label { font-size: 12px; }
  .hero-stats { flex-direction: column; gap: 12px; }

  /* Section headers */
  .section-title { font-size: 24px; }
  .section-desc { font-size: 14px; }
  .section-label { font-size: 12px; }

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

  /* Product page */
  .product-title { font-size: 20px; }
  .calc-card { padding: 16px; }
  .calc-label { font-size: 13px; }
  .price-total-value { font-size: 24px; }

  /* SEO section */
  .seo-content,
  .seo-bottom-content { padding: 20px 16px; font-size: 13.5px; }
  .seo-content .seo-title,
  .seo-content h2,
  .seo-bottom-content h2 { font-size: 16px; }
  .seo-content h3,
  .seo-bottom-content h3 { font-size: 15px; }

  /* Product simple */
  .product-simple-price { font-size: 24px; }
  .spec-row { font-size: 13px; }

  /* Footer */
  .footer-grid { grid-template-columns: 1fr; }
  .footer-col h4 { font-size: 15px; }

  /* Contacts */
  .contacts-hero h1 { font-size: 24px; }
  .contacts-form-card { padding: 16px; }

  /* 404 */
  .error-404__code { font-size: 64px; }
  .error-404__title { font-size: 20px; }

  /* Portfolio */
  .portfolio-hero h1 { font-size: 24px; }

  /* Logo */
  .logo-mark { width: 30px; height: 30px; }
  .logo-name { font-size: 16px; }
  .logo-slogan { font-size: 10px; }

  /* Modal */
  .modal { margin: 12px; padding: 20px; }
  .modal h3 { font-size: 18px; }

  /* Production video */
  .prod-video-section { padding: 32px 0 0; }
  .prod-video-frame { height: 240px; }
}