:root {
  --ink: #101820;
  --muted: #62717f;
  --line: #dfe7ee;
  --panel: #ffffff;
  --surface: #f6f8fb;
  --surface-strong: #edf3f7;
  --blue: #12618f;
  --blue-dark: #0c3048;
  --green: #26724b;
  --gold: #d1932c;
  --red: #b8453d;
  --shadow: 0 18px 50px rgba(16, 24, 32, 0.12);
  --shadow-soft: 0 10px 28px rgba(16, 24, 32, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(180deg, #f9fbfc 0, var(--surface) 520px),
    var(--surface);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 8px 24px rgba(16, 24, 32, 0.06);
  backdrop-filter: blur(18px);
}

.topbar {
  display: flex;
  justify-content: flex-end;
  gap: 24px;
  padding: 9px clamp(18px, 5vw, 72px);
  color: #eef6fa;
  background: #102a3c;
  font-size: 14px;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  min-height: 76px;
  padding: 0 clamp(18px, 5vw, 72px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  letter-spacing: 0;
  color: #111d27;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  color: #fff;
  background: linear-gradient(135deg, var(--red), #8f302b);
  border-radius: 6px;
  box-shadow: 0 10px 22px rgba(184, 69, 61, 0.28);
  font-size: 15px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #34424f;
  font-weight: 650;
}

.nav-links a {
  padding: 10px 13px;
  border-radius: 6px;
  transition:
    color 160ms ease,
    background 160ms ease;
}

.nav-links a:hover {
  color: var(--blue);
  background: #edf4f8;
}

.nav-links a[aria-current="page"] {
  color: #fff;
  background: var(--blue);
}

.menu-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 14px;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 6px;
  box-shadow: var(--shadow-soft);
  font: inherit;
}

.menu-toggle svg,
.button svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
}

.hero {
  position: relative;
  min-height: min(780px, calc(100vh - 100px));
  overflow: hidden;
  display: grid;
  align-items: center;
  padding: 82px clamp(18px, 5vw, 72px) 104px;
  color: #fff;
}

.hero img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(5, 19, 30, 0.9), rgba(8, 38, 58, 0.64) 47%, rgba(8, 38, 58, 0.12)),
    linear-gradient(0deg, rgba(5, 19, 30, 0.36), rgba(5, 19, 30, 0));
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(760px, 100%);
  padding: 6px 0;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  margin: 0 0 14px;
  padding: 0 10px;
  color: var(--gold);
  background: rgba(209, 147, 44, 0.12);
  border: 1px solid rgba(209, 147, 44, 0.26);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  max-width: 820px;
  font-size: clamp(38px, 5.7vw, 74px);
  line-height: 1;
  letter-spacing: 0;
}

h2 {
  margin: 0;
  font-size: clamp(29px, 3.7vw, 46px);
  line-height: 1.08;
  letter-spacing: 0;
}

h3 {
  margin: 0;
  font-size: 21px;
  line-height: 1.2;
}

.hero-copy {
  max-width: 650px;
  margin: 24px 0 0;
  color: #e2edf3;
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 50px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 6px;
  font-weight: 800;
  cursor: pointer;
  box-shadow: none;
  transition:
    transform 160ms ease,
    box-shadow 160ms ease,
    background 160ms ease,
    border-color 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button.primary {
  color: #fff;
  background: linear-gradient(135deg, var(--green), #1f5d3e);
  box-shadow: 0 12px 24px rgba(38, 114, 75, 0.22);
}

.button.primary:hover {
  background: #23653e;
}

.button.secondary {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.58);
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(10px);
}

.button.outline {
  color: var(--blue);
  background: #fff;
  border-color: #c8d8e3;
  box-shadow: none;
}

.button.outline:hover {
  background: #edf4f8;
  border-color: #a9c3d3;
}

.button:not(.secondary) {
  border-color: transparent;
}

.section {
  padding: 86px clamp(18px, 5vw, 72px);
}

.page-hero {
  display: grid;
  align-items: end;
  min-height: 390px;
  padding: 96px clamp(18px, 5vw, 72px);
  color: #fff;
  background:
    linear-gradient(115deg, rgba(12, 48, 72, 0.98), rgba(30, 52, 65, 0.9)),
    linear-gradient(135deg, var(--blue-dark), #263b48);
}

.page-hero div {
  width: min(860px, 100%);
}

.page-hero p:not(.eyebrow) {
  max-width: 720px;
  margin: 22px 0 0;
  color: #d8e6ee;
  font-size: 18px;
}

.intro {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(300px, 1fr);
  gap: 44px;
  align-items: end;
  background: #fff;
  border-bottom: 1px solid var(--line);
}

.intro > p {
  max-width: 760px;
  margin: 0;
  color: var(--muted);
  font-size: 18px;
}

.section-heading {
  max-width: 860px;
  margin-bottom: 34px;
}

.product-section {
  background: var(--surface);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.product-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 286px;
  padding: 28px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow-soft);
  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    border-color 180ms ease;
}

.product-card:hover {
  transform: translateY(-3px);
  border-color: #c7d6df;
  box-shadow: var(--shadow);
}

.product-card p {
  margin: 0;
  color: var(--muted);
}

.product-card a {
  margin-top: auto;
  color: var(--blue);
  font-weight: 800;
}

.icon-chip {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  color: #fff;
  background: linear-gradient(135deg, var(--blue), #0b3f5f);
  border-radius: 6px;
  font-weight: 800;
}

.band {
  padding: 80px clamp(18px, 5vw, 72px);
  color: #fff;
  background:
    linear-gradient(135deg, #172633, #20303c 48%, #273944),
    #20303c;
}

.band-content {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1.1fr);
  gap: 56px;
  align-items: start;
}

.features {
  display: grid;
  gap: 22px;
}

.features div {
  padding: 20px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-left: 3px solid var(--gold);
  border-radius: 8px;
}

.features strong {
  display: block;
  font-size: 20px;
}

.features p {
  margin: 8px 0 0;
  color: #cfdae2;
}

.process {
  background: #fff;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.steps li {
  min-height: 220px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: var(--shadow-soft);
}

.steps span {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  margin-bottom: 18px;
  color: #fff;
  background: var(--red);
  border-radius: 6px;
  font-weight: 800;
}

.steps p {
  margin: 12px 0 0;
  color: var(--muted);
}

.cta {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 520px);
  gap: 54px;
  align-items: start;
  padding: 86px clamp(18px, 5vw, 72px);
  color: #fff;
  background:
    linear-gradient(135deg, var(--blue-dark), #173f5a 54%, #253944),
    var(--blue-dark);
}

.cta p {
  color: #d6e3ec;
}

.contact-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 22px;
  margin-top: 28px;
  color: #fff;
  font-weight: 800;
}

.quote-form {
  display: grid;
  gap: 16px;
  padding: 26px;
  color: var(--ink);
  background: #fff;
  border: 1px solid rgba(223, 231, 238, 0.9);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

label {
  display: grid;
  gap: 7px;
  color: #2c3844;
  font-weight: 750;
}

input,
select,
textarea {
  width: 100%;
  min-height: 46px;
  padding: 11px 12px;
  color: var(--ink);
  background: #fff;
  border: 1px solid #cedae3;
  border-radius: 6px;
  font: inherit;
  transition:
    border-color 160ms ease,
    box-shadow 160ms ease,
    background 160ms ease;
}

textarea {
  resize: vertical;
}

input:focus,
select:focus,
textarea:focus {
  outline: 3px solid rgba(15, 93, 143, 0.18);
  border-color: var(--blue);
}

.form-status {
  min-height: 24px;
  margin: 0;
  color: var(--green);
  font-weight: 800;
}

.quote-form .form-status {
  color: var(--green);
}

.catalog-layout {
  display: grid;
  grid-template-columns: 290px minmax(0, 1fr);
  gap: 28px;
  padding: 42px clamp(18px, 5vw, 72px) 86px;
}

.filters {
  position: sticky;
  top: 112px;
  display: grid;
  align-self: start;
  gap: 18px;
  padding: 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow-soft);
}

.filters h2 {
  font-size: 24px;
}

.catalog-results {
  min-width: 0;
}

.catalog-toolbar {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: end;
  margin-bottom: 20px;
}

.catalog-toolbar label {
  width: min(260px, 100%);
}

.catalog-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.item-card {
  display: grid;
  min-height: 100%;
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow-soft);
  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    border-color 180ms ease;
}

.item-card:hover {
  transform: translateY(-3px);
  border-color: #c7d6df;
  box-shadow: var(--shadow);
}

.item-media {
  min-height: 176px;
  border-bottom: 1px solid var(--line);
}

.item-body {
  display: flex;
  flex-direction: column;
  gap: 13px;
  padding: 22px;
}

.item-body p {
  margin: 0;
  color: var(--muted);
}

.item-body dl,
.spec-list {
  display: grid;
  gap: 8px;
  margin: 0;
}

.item-body dl div,
.spec-list div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding-top: 8px;
  border-top: 1px solid #edf1f4;
}

dt {
  color: var(--muted);
  font-weight: 650;
}

dd {
  margin: 0;
  text-align: right;
  font-weight: 800;
}

.stock {
  display: inline-flex;
  align-items: center;
  width: max-content;
  min-height: 30px;
  padding: 0 11px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 850;
}

.stock.in-stock {
  color: #15572f;
  background: #dff2e7;
}

.stock.order {
  color: #74480b;
  background: #f7e7c8;
}

.stock.neutral {
  color: #34424f;
  background: #e8eef2;
}

.item-link {
  margin-top: auto;
  color: var(--blue);
  font-weight: 850;
  width: max-content;
  padding-bottom: 2px;
  border-bottom: 2px solid rgba(18, 97, 143, 0.2);
}

.valve-art,
.hose-art,
.meter-art,
.coupler-art,
.cap-art,
.sensor-art {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(135deg, #eef4f8, #ffffff 72%),
    #fff;
}

.valve-art::marker,
.hose-art::marker,
.meter-art::marker,
.coupler-art::marker,
.cap-art::marker,
.sensor-art::marker {
  display: none;
}

.valve-art::before {
  content: "";
  position: absolute;
  left: 18%;
  top: 42%;
  width: 64%;
  height: 28%;
  background: linear-gradient(90deg, #66737e, #b2bdc6, #596671);
  border-radius: 8px;
  box-shadow:
    -22px 8px 0 #35444f,
    22px -18px 0 #8f9ba5;
}

.valve-art::after {
  content: "";
  position: absolute;
  left: 40%;
  top: 20%;
  width: 20%;
  height: 52%;
  border: 12px solid #b53b34;
  border-radius: 50%;
}

.hose-art::before {
  content: "";
  position: absolute;
  left: 16%;
  top: 28%;
  width: 66%;
  height: 54%;
  border: 18px solid #263b48;
  border-left-color: transparent;
  border-radius: 50%;
}

.hose-art::after {
  content: "";
  position: absolute;
  right: 16%;
  bottom: 28%;
  width: 62px;
  height: 26px;
  background: #c78522;
  border-radius: 6px;
}

.meter-art::before {
  content: "";
  position: absolute;
  left: 26%;
  top: 18%;
  width: 48%;
  height: 48%;
  border: 14px solid #0f5d8f;
  border-radius: 50%;
  background: #fff;
}

.meter-art::after {
  content: "";
  position: absolute;
  left: 22%;
  bottom: 24%;
  width: 56%;
  height: 20px;
  background: #5f6d7a;
  border-radius: 8px;
}

.coupler-art::before {
  content: "";
  position: absolute;
  left: 20%;
  top: 35%;
  width: 60%;
  height: 30%;
  background: linear-gradient(90deg, #c78522, #e3b65f, #9a6516);
  border-radius: 14px;
}

.coupler-art::after {
  content: "";
  position: absolute;
  left: 28%;
  top: 23%;
  width: 44%;
  height: 54%;
  border: 8px solid #20303c;
  border-left: 0;
  border-right: 0;
}

.cap-art::before {
  content: "";
  position: absolute;
  left: 24%;
  top: 24%;
  width: 52%;
  height: 52%;
  border: 14px solid #66737e;
  border-radius: 50%;
  background: #dfe7ec;
}

.cap-art::after {
  content: "";
  position: absolute;
  left: 34%;
  top: 42%;
  width: 32%;
  height: 16%;
  background: #b53b34;
  border-radius: 999px;
}

.sensor-art::before {
  content: "";
  position: absolute;
  left: 34%;
  top: 18%;
  width: 32%;
  height: 58%;
  background: #20303c;
  border-radius: 10px;
}

.sensor-art::after {
  content: "";
  position: absolute;
  left: 43%;
  top: 30%;
  width: 14%;
  height: 14%;
  background: #2c7a4b;
  border-radius: 50%;
  box-shadow: 0 32px 0 #c78522;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 20px clamp(18px, 5vw, 72px);
  color: var(--muted);
  background: #fff;
  border-bottom: 1px solid var(--line);
  font-weight: 700;
}

.breadcrumbs a {
  color: var(--blue);
}

.product-detail {
  display: grid;
  grid-template-columns: minmax(300px, 0.9fr) minmax(0, 1fr);
  gap: 56px;
  padding: 64px clamp(18px, 5vw, 72px) 80px;
  background: #fff;
}

.product-visual {
  display: grid;
  gap: 16px;
}

.large-product-art {
  min-height: 480px;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow-soft);
}

.product-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.product-info {
  align-self: center;
}

.product-info .lead {
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 19px;
}

.price-box {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
  margin: 30px 0;
  padding: 22px;
  background:
    linear-gradient(135deg, #f7fafc, #eef4f8),
    var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.price-box span {
  display: block;
  color: var(--muted);
  font-weight: 700;
}

.price-box strong {
  display: block;
  margin-top: 4px;
  font-size: 28px;
}

.price-box small {
  display: block;
  max-width: 320px;
  margin-top: 4px;
  color: var(--muted);
  font-weight: 650;
}

.shop-panel {
  display: grid;
  gap: 16px;
  margin-bottom: 24px;
  padding: 22px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow-soft);
}

.quantity-row {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr);
  gap: 14px;
}

.quantity-input {
  text-align: center;
  font-weight: 850;
}

.shop-actions {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
}

.cart-status {
  min-height: 24px;
  margin: 0;
  color: var(--green);
  font-weight: 850;
}

.spec-list {
  padding: 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow-soft);
}

.product-tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  padding: 0 clamp(18px, 5vw, 72px) 86px;
  background: #fff;
}

.product-tabs article {
  padding: 28px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow-soft);
}

.product-tabs h2 {
  font-size: 26px;
}

.product-tabs p {
  color: var(--muted);
}

.check-list {
  display: grid;
  gap: 10px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  color: var(--muted);
}

.check-list li {
  position: relative;
  padding-left: 24px;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 10px;
  height: 10px;
  background: var(--green);
  border-radius: 50%;
}

.product-request {
  margin-top: 0;
}

.commerce-section {
  padding: 0 clamp(18px, 5vw, 72px) 86px;
  background: #fff;
}

.kit-section {
  padding-top: 0;
}

.kit-grid,
.certificate-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.kit-card,
.certificate-card,
.resource-card,
.video-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow-soft);
}

.kit-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 260px;
  padding: 24px;
}

.kit-card p,
.certificate-card p,
.resource-card p,
.video-card p {
  color: var(--muted);
}

.kit-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid #edf1f4;
}

.kit-footer strong {
  font-size: 20px;
}

.product-resources {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  gap: 18px;
}

.video-card {
  display: grid;
  grid-template-columns: minmax(260px, 0.9fr) minmax(0, 1fr);
  gap: 26px;
  align-items: center;
  padding: 24px;
}

.video-placeholder {
  display: grid;
  place-items: center;
  min-height: 260px;
  background:
    linear-gradient(135deg, rgba(16, 24, 32, 0.72), rgba(16, 48, 72, 0.78)),
    url("assets/hero-tanker-equipment.png") center / cover;
  border-radius: 8px;
}

.video-placeholder svg {
  width: 72px;
  height: 72px;
  padding: 20px;
  color: #fff;
  fill: currentColor;
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.32);
  border-radius: 50%;
  backdrop-filter: blur(10px);
}

.resource-card {
  padding: 24px;
}

.download-list {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.download-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 58px;
  padding: 12px 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.download-row span {
  font-weight: 750;
}

.download-row strong {
  color: var(--blue);
}

.certificate-card {
  padding: 24px;
}

.certificate-card span {
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  margin-bottom: 18px;
  color: #fff;
  background: linear-gradient(135deg, var(--blue), #0b3f5f);
  border-radius: 8px;
  font-weight: 900;
}

.compact-related .item-media {
  min-height: 140px;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 34px clamp(18px, 5vw, 72px);
  color: #d9e3ea;
  background: #101820;
}

.footer p {
  margin: 8px 0 0;
  color: #9cafbd;
}

.footer-links {
  display: flex;
  gap: 20px;
  font-weight: 750;
}

@media (max-width: 900px) {
  .topbar {
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px 18px;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .nav {
    position: relative;
  }

  .nav-links {
    position: absolute;
    right: 18px;
    top: calc(100% + 1px);
    display: none;
    width: min(320px, calc(100vw - 36px));
    padding: 12px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: var(--shadow);
  }

  .nav-links.is-open {
    display: grid;
  }

  .intro,
  .band-content,
  .cta,
  .catalog-layout,
  .product-detail {
    grid-template-columns: 1fr;
  }

  .filters {
    position: static;
    order: 2;
  }

  .catalog-results {
    order: 1;
  }

  .product-info {
    order: -1;
  }

  .product-grid,
  .steps,
  .catalog-grid,
  .product-tabs,
  .kit-grid,
  .certificate-grid,
  .product-resources,
  .video-card {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .catalog-toolbar,
  .price-box,
  .shop-actions {
    align-items: stretch;
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  .topbar span {
    width: 100%;
    text-align: center;
  }

  .brand span:last-child {
    max-width: 170px;
  }

  .hero {
    min-height: 680px;
    padding-top: 54px;
  }

  .hero-overlay {
    background: linear-gradient(90deg, rgba(9, 24, 37, 0.9), rgba(9, 24, 37, 0.6));
  }

  h1 {
    font-size: 42px;
  }

  .button {
    width: 100%;
  }

  .product-grid,
  .steps,
  .catalog-grid,
  .product-tabs,
  .kit-grid,
  .certificate-grid,
  .product-resources,
  .video-card,
  .quantity-row,
  .shop-actions {
    grid-template-columns: 1fr;
  }

  .section,
  .band,
  .cta,
  .page-hero,
  .catalog-layout,
  .product-detail,
  .commerce-section {
    padding-top: 64px;
    padding-bottom: 64px;
  }

  .kit-section {
    padding-top: 0;
  }

  .large-product-art {
    min-height: 320px;
  }

  .kit-footer {
    align-items: stretch;
    flex-direction: column;
  }

  .footer {
    display: grid;
  }

  .footer-links {
    flex-wrap: wrap;
  }
}