/* Mobile and tablet layout refinements for compact, readable site presentation. */
@media (max-width: 900px) {
  :root { --header-h: 102px !important; }
  html { scroll-padding-top: 108px !important; }
  body { padding-top: var(--header-h) !important; }

  /* Compact two-row header with the enquiry button kept visible. */
  .topbar .container { width: min(100%, calc(100% - 12px)) !important; }
  .topbar-inner {
    min-height: var(--header-h) !important;
    padding: 6px 0 !important;
    gap: 5px 7px !important;
    flex-wrap: wrap !important;
    align-content: center !important;
  }
  .brand {
    flex: 1 1 calc(100% - 48px) !important;
    max-width: calc(100% - 48px) !important;
    gap: 7px !important;
    margin: 0 !important;
  }
  .brand-logo { width: 47px !important; height: 38px !important; }
  .brand-overline { font-size: 8.5px !important; margin-bottom: 2px !important; }
  .brand-title { font-size: 13.5px !important; line-height: 1 !important; }
  .brand-subtitle { display: none !important; }
  .menu-toggle { display: inline-flex !important; width: 42px !important; height: 42px !important; border-radius: 13px !important; }
  .header-actions {
    order: 3 !important;
    width: 100% !important;
    margin: 0 !important;
    display: grid !important;
    grid-template-columns: minmax(0, 1fr) auto auto !important;
    align-items: center !important;
    gap: 6px !important;
    justify-content: stretch !important;
  }
  .header-request-wrap { display: block !important; width: 100% !important; min-width: 0 !important; }
  .topbar-cta,
  .btn.btn-primary.topbar-cta,
  .header-request-wrap .topbar-cta {
    display: inline-flex !important;
    width: 100% !important;
    min-height: 38px !important;
    height: 38px !important;
    padding: 0 10px !important;
    border-radius: 12px !important;
    font-size: 12px !important;
    line-height: 1.1 !important;
    flex: 0 0 auto !important;
  }
  .lang-switch { gap: 2px !important; padding: 3px !important; }
  .lang-switch .lang-link { min-width: 34px !important; height: 32px !important; padding: 0 7px !important; font-size: 11px !important; }
  .header-search-btn { width: 38px !important; height: 38px !important; border-radius: 12px !important; }
  .header-search-btn svg { width: 17px !important; height: 17px !important; }

  /* Hero image is displayed at its native 4:3 proportions, without cropping. */
  .hero {
    display: block !important;
    min-height: 0 !important;
    background: #0e1825 !important;
  }
  .hero::before {
    content: "";
    display: block;
    width: 100%;
    aspect-ratio: 4 / 3;
    background: #0e1825 url('hero-main.jpg') center center / contain no-repeat;
  }
  .hero-grid { display: block !important; padding: 13px 0 18px !important; }
  .hero h1 { margin: 0 0 9px !important; font-size: clamp(25px, 6.9vw, 34px) !important; line-height: 1.03 !important; }
  .hero-icons { gap: 5px !important; margin: 0 0 10px !important; }
  .hero-tag { gap: 5px !important; padding: 5px 7px !important; font-size: 10px !important; }
  .hero-tag svg { width: 11px !important; height: 11px !important; }
  .hero p { margin: 0 0 10px !important; font-size: 12.5px !important; line-height: 1.43 !important; max-width: 100% !important; }
  .hero .btn-row { gap: 6px !important; }
  .hero .btn-row .btn { min-height: 39px !important; padding-inline: 10px !important; font-size: 12px !important; border-radius: 12px !important; }
  .hero-card { margin-top: 11px !important; padding: 9px !important; border-radius: 16px !important; }
  .hero-list { grid-template-columns: repeat(2, minmax(0, 1fr)) !important; gap: 6px !important; margin: 0 0 7px !important; }
  .hero-item { min-height: 42px !important; gap: 6px !important; padding: 6px !important; border-radius: 10px !important; font-size: 10px !important; line-height: 1.15 !important; }
  .hero-icon { width: 26px !important; height: 26px !important; flex: 0 0 26px !important; border-radius: 8px !important; font-size: 11px !important; }
  .hero-card > .btn { min-height: 38px !important; font-size: 12px !important; border-radius: 12px !important; }
  .strip { margin-top: 0 !important; }

  /* Three partner/client cards are visible simultaneously. */
  .partners-wrap { padding: 13px !important; border-radius: 20px !important; }
  .partner-group + .partner-group { margin-top: 16px !important; }
  .partner-group-head { gap: 8px !important; margin-bottom: 9px !important; }
  .partner-group-title { font-size: 19px !important; }
  .slider-tools { gap: 6px !important; }
  .slider-btn { width: 34px !important; height: 34px !important; border-radius: 11px !important; font-size: 19px !important; }
  .partners-wrap .logo-slider,
  .timeline-wrap .logo-slider { mask-image: none !important; -webkit-mask-image: none !important; }
  .partners-wrap .logo-track,
  .timeline-wrap .logo-track { width: 100% !important; gap: 7px !important; align-items: stretch !important; }
  .partners-wrap .logo-card {
    flex: 0 0 calc((100% - 14px) / 3) !important;
    width: calc((100% - 14px) / 3) !important;
    min-width: 0 !important;
    height: 72px !important;
    padding: 5px !important;
    border-radius: 12px !important;
  }
  .partners-wrap .logo-card img,
  .partners-wrap .logo-card img.kara-big { width: 100% !important; height: 100% !important; object-fit: contain !important; }

  /* Compact enquiry forms. */
  .request-box { padding: 14px !important; border-radius: 20px !important; margin-top: 20px !important; }
  .request-grid,
  .request-grid.reverse { grid-template-columns: 1fr !important; gap: 11px !important; }
  .request-grid.reverse > div { order: 1 !important; }
  .request-grid.reverse > form { order: 2 !important; }
  .request-box .section-title { font-size: 21px !important; line-height: 1.08 !important; margin-bottom: 6px !important; }
  .request-box .section-subtitle { font-size: 12px !important; line-height: 1.42 !important; }
  .request-box .small-muted { margin-top: 9px !important; font-size: 11.5px !important; line-height: 1.42 !important; }
  .request-box .switch-row { gap: 6px !important; margin-top: 9px !important; }
  .request-box .switch-btn { min-height: 35px !important; padding: 0 11px !important; border-radius: 10px !important; font-size: 11px !important; }
  .request-box .form { gap: 8px !important; padding: 10px !important; border-radius: 15px !important; }
  .request-box .field { min-height: 39px !important; padding: 0 11px !important; border-radius: 11px !important; font-size: 12px !important; }
  .request-box textarea.field { min-height: 70px !important; padding-top: 10px !important; }
  .request-box .site-policy-check { gap: 6px !important; font-size: 10.5px !important; line-height: 1.3 !important; }
  .request-box .site-policy-check input { width: 15px !important; height: 15px !important; }
  .request-box .btn { min-height: 39px !important; font-size: 12px !important; border-radius: 11px !important; }

  /* Three timeline cards remain in view at once. */
  .timeline-wrap { padding: 13px !important; border-radius: 20px !important; }
  .timeline-wrap .partner-group-head { margin-bottom: 10px !important; }
  .timeline-card.logo-card {
    flex: 0 0 calc((100% - 14px) / 3) !important;
    width: calc((100% - 14px) / 3) !important;
    min-width: 0 !important;
    height: 142px !important;
    min-height: 0 !important;
    padding: 8px 5px !important;
    border-radius: 13px !important;
  }
  .timeline-month { font-size: 9px !important; min-height: 0 !important; margin-bottom: 3px !important; }
  .timeline-year { font-size: 25px !important; line-height: 1 !important; margin-bottom: 5px !important; }
  .timeline-title { min-height: 0 !important; margin-bottom: 4px !important; font-size: 9px !important; line-height: 1.18 !important; }
  .timeline-card p { display: block !important; min-height: 0 !important; max-height: 30px !important; overflow: hidden !important; font-size: 8px !important; line-height: 1.22 !important; }

  /* Three gallery images and all three certificates appear per row. */
  .photo-gallery-shell { padding: 12px !important; border-radius: 18px !important; }
  .photo-gallery-head { margin-bottom: 9px !important; }
  .photo-gallery-title,
  .certificates-title { font-size: 20px !important; }
  .photo-gallery-grid { grid-template-columns: repeat(3, minmax(0, 1fr)) !important; gap: 6px !important; }
  .photo-gallery-item { aspect-ratio: 1 / 1 !important; min-height: 0 !important; border-radius: 10px !important; }
  .certificates-grid { grid-template-columns: repeat(3, minmax(0, 1fr)) !important; gap: 6px !important; }
  .certificate-frame { max-width: none !important; padding: 4px !important; border-radius: 7px !important; box-shadow: 0 8px 16px rgba(8,14,20,.1) !important; }

  /* Shorter footer on smaller screens. */
  .footer { padding: 14px 0 16px !important; margin-top: 24px !important; }
  .footer-grid { grid-template-columns: repeat(3, minmax(0, 1fr)) !important; gap: 8px !important; }
  .footer h4 { font-size: 11.5px !important; line-height: 1.2 !important; margin: 0 0 6px !important; }
  .footer p,
  .footer a,
  .footer .footer-links a { font-size: 9.5px !important; line-height: 1.34 !important; overflow-wrap: anywhere !important; }
  .footer .footer-actions,
  .footer .footer-links { gap: 4px !important; margin-top: 0 !important; }
}

@media (min-width: 641px) and (max-width: 900px) {
  :root { --header-h: 94px !important; }
  .hero::before { max-height: 570px; }
  .partners-wrap .logo-card { height: 92px !important; }
  .timeline-card.logo-card { height: 180px !important; }
  .timeline-year { font-size: 38px !important; }
  .timeline-title { font-size: 12px !important; }
  .timeline-card p { font-size: 10px !important; max-height: 42px !important; }
  .photo-gallery-item { aspect-ratio: 4 / 3 !important; }
  .footer p, .footer a, .footer .footer-links a { font-size: 12px !important; }
  .footer h4 { font-size: 15px !important; }
}
@media (max-width: 900px) {
  .topbar .brand img:not(.brand-logo) { width: 47px !important; height: 38px !important; object-fit: contain !important; }
  .topbar .lang { font-size: 11px !important; gap: 4px !important; }
}

/* Phone and tablet polish — compact header, overlaid hero content, normalized logos and CTA. */
@media (max-width: 900px) {
  :root { --header-h: 90px !important; }
  html { scroll-padding-top: 96px !important; }

  /* Header: burger in the upper-right corner and all controls closer together. */
  .topbar-inner {
    position: relative !important;
    display: block !important;
    min-height: var(--header-h) !important;
    padding: 5px 0 5px !important;
  }
  .brand {
    display: flex !important;
    align-items: center !important;
    width: calc(100% - 48px) !important;
    max-width: calc(100% - 48px) !important;
    height: 43px !important;
    gap: 8px !important;
    padding-right: 4px !important;
  }
  .brand-logo {
    width: 58px !important;
    height: 45px !important;
    flex: 0 0 58px !important;
  }
  .brand-overline { font-size: 9px !important; line-height: 1.05 !important; }
  .brand-title { font-size: 14.5px !important; line-height: 1.05 !important; }
  .menu-toggle {
    position: absolute !important;
    top: 5px !important;
    right: 0 !important;
    width: 42px !important;
    height: 42px !important;
  }
  .header-actions {
    display: grid !important;
    grid-template-columns: minmax(0, 1fr) auto auto !important;
    width: 100% !important;
    gap: 5px !important;
    margin: 2px 0 0 !important;
    align-items: center !important;
  }
  .topbar-cta,
  .btn.btn-primary.topbar-cta,
  .header-request-wrap .topbar-cta {
    height: 35px !important;
    min-height: 35px !important;
    border-radius: 11px !important;
    font-size: 11.5px !important;
  }
  .lang-switch { height: 35px !important; padding: 2px !important; gap: 1px !important; }
  .lang-switch .lang-link { min-width: 33px !important; height: 31px !important; font-size: 11px !important; padding: 0 6px !important; }
  .header-search-btn { width: 35px !important; height: 35px !important; border-radius: 11px !important; }

  /* Hero: full uncropped photograph remains visible and copy is placed on its darkened image. */
  .hero {
    position: relative !important;
    min-height: 0 !important;
    background-color: #0e1825 !important;
    background-image:
      linear-gradient(90deg, rgba(5,12,21,.84) 0%, rgba(5,12,21,.72) 54%, rgba(5,12,21,.48) 100%),
      url('hero-main.jpg') !important;
    background-position: top center !important;
    background-repeat: no-repeat !important;
    background-size: 100% auto !important;
  }
  .hero::before { display: none !important; content: none !important; }
  .hero-grid { display: block !important; padding: 0 0 14px !important; }
  .hero-grid > div:first-child {
    box-sizing: border-box !important;
    min-height: calc((100vw - 12px) * .75) !important;
    padding: 12px 8px 10px !important;
    display: flex !important;
    flex-direction: column !important;
    justify-content: flex-end !important;
  }
  .hero h1 { margin: 0 0 7px !important; font-size: clamp(23px, 6.2vw, 31px) !important; line-height: 1.03 !important; }
  .hero-icons { gap: 4px !important; margin: 0 0 8px !important; }
  .hero-tag { gap: 4px !important; padding: 4px 7px !important; font-size: 9px !important; line-height: 1.18 !important; }
  .hero-tag svg { width: 10px !important; height: 10px !important; }
  .hero p { margin: 0 0 8px !important; max-width: 96% !important; font-size: 11.5px !important; line-height: 1.37 !important; }
  .hero .btn-row { gap: 5px !important; }
  .hero .btn-row .btn { min-height: 34px !important; height: 34px !important; padding-inline: 9px !important; font-size: 10.5px !important; border-radius: 10px !important; }
  .hero-card { margin: 8px 8px 0 !important; }

  /* Partner and client logos must be fully contained and visually uniform. */
  .partners-wrap .logo-card { display: flex !important; align-items: center !important; justify-content: center !important; padding: 8px !important; }
  .partners-wrap .logo-card img,
  .partners-wrap .logo-card img.kara-big {
    width: auto !important;
    height: auto !important;
    max-width: 82% !important;
    max-height: 54% !important;
    object-fit: contain !important;
    object-position: center !important;
  }

  /* Presentation download banner: reduce vertical weight on compact devices. */
  .presentation-shell .plain-cta {
    padding: 14px 14px !important;
    gap: 12px !important;
    border-radius: 18px !important;
  }
  .presentation-copy h3 {
    font-size: clamp(19px, 5.5vw, 26px) !important;
    line-height: 1.13 !important;
  }
  .presentation-shell .btn {
    min-height: 39px !important;
    padding: 0 12px !important;
    border-radius: 11px !important;
    font-size: 12px !important;
  }
}

@media (min-width: 641px) and (max-width: 900px) {
  :root { --header-h: 78px !important; }
  .topbar-inner { display: flex !important; align-items: center !important; padding: 5px 50px 5px 0 !important; }
  .brand { height: 58px !important; width: auto !important; max-width: 42% !important; }
  .brand-logo { width: 70px !important; height: 54px !important; flex-basis: 70px !important; }
  .header-actions { width: auto !important; margin: 0 0 0 auto !important; min-width: 320px !important; }
  .hero-grid > div:first-child { min-height: min(calc(100vw * .68), 560px) !important; padding: 32px 22px 20px !important; }
  .hero h1 { font-size: clamp(32px, 5vw, 42px) !important; }
  .hero-tag { font-size: 12px !important; padding: 6px 10px !important; }
  .hero p { font-size: 15px !important; max-width: 68% !important; }
  .hero .btn-row .btn { min-height: 42px !important; height: 42px !important; font-size: 13px !important; }
  .partners-wrap .logo-card img,
  .partners-wrap .logo-card img.kara-big { max-width: 80% !important; max-height: 60% !important; }
}


/* Related products: show two cards per row on phones and tablets. */
@media (max-width: 900px) {
  .related-products-wrap { padding-inline: 0 !important; }
  .related-products { margin-top: 28px !important; }
  .related-products h2 {
    margin: 0 0 16px !important;
    font-size: clamp(20px, 6vw, 30px) !important;
    line-height: 1.12 !important;
  }
  .related-products-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
    gap: 10px !important;
  }
  .related-product-card { border-radius: 18px !important; }
  .related-product-media {
    aspect-ratio: 1 / 1 !important;
    padding: 10px !important;
  }
  .related-product-badge {
    left: 8px !important;
    top: 8px !important;
    padding: 6px 9px !important;
    font-size: 10px !important;
  }
  .related-product-body {
    gap: 10px !important;
    padding: 12px 12px 14px !important;
  }
  .related-product-name {
    font-size: 14px !important;
    line-height: 1.2 !important;
  }
  .related-product-btn {
    min-height: 34px !important;
    padding: 0 14px !important;
    font-size: 11px !important;
    border-radius: 999px !important;
  }
}

@media (min-width: 641px) and (max-width: 900px) {
  .related-products-grid { gap: 14px !important; }
  .related-product-media { padding: 14px !important; }
  .related-product-name { font-size: 16px !important; }
  .related-product-btn { min-height: 38px !important; font-size: 12px !important; }
}


/* Partner logos: enlarge and normalize visual scale on phones/tablets. */
@media (max-width: 900px) {
  .partners-wrap .logo-card {
    padding: 4px !important;
    height: 76px !important;
  }
  .partners-wrap .logo-card img,
  .partners-wrap .logo-card img.kara-big {
    width: auto !important;
    height: auto !important;
    max-width: 92% !important;
    max-height: 68% !important;
    object-fit: contain !important;
    object-position: center !important;
    margin: 0 auto !important;
  }
  .partners-wrap .logo-card img[alt="Роснефть"],
  .partners-wrap .logo-card img[alt="Кара Алтын"],
  .partners-wrap .logo-card img[alt="Таграс"],
  .partners-wrap .logo-card img[alt="Таграс-Ремсервис"],
  .partners-wrap .logo-card img[alt="Татнефть"],
  .partners-wrap .logo-card img[alt="ТМС Групп"] {
    max-width: 96% !important;
    max-height: 74% !important;
  }
}

@media (min-width: 641px) and (max-width: 900px) {
  .partners-wrap .logo-card {
    height: 94px !important;
    padding: 6px !important;
  }
  .partners-wrap .logo-card img,
  .partners-wrap .logo-card img.kara-big {
    max-width: 94% !important;
    max-height: 72% !important;
  }
}

/* Exact form navigation: selected request block appears immediately below the fixed header. */
.request-box {
  scroll-margin-top: calc(var(--header-h, 86px) + 10px) !important;
}
@media (max-width: 900px) {
  .request-box {
    scroll-margin-top: calc(var(--header-h, 90px) + 10px) !important;
  }
}