:root {
  --bg: #f4f7fb;
  --surface: #ffffff;
  --ink: #14202e;
  --muted: #5c6b7d;
  --line: #e3e9f1;
  --navy: #0b1f33;
  --navy-soft: #122a44;
  --brand: #0e76bc;
  --brand-dark: #0a5a91;
  --accent: #16a7e6;
  --teal: #0f766e;
  --shadow: 0 18px 44px rgba(13, 38, 66, 0.14);
  --shadow-soft: 0 10px 30px rgba(13, 38, 66, 0.08);
  --font: "Inter", "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: var(--font);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

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

/* ============ Header ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 26px;
  width: min(1240px, 100%);
  min-height: 70px;
  margin: 0 auto;
  padding: 0 clamp(18px, 4vw, 48px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-logo {
  height: 46px;
  width: auto;
  display: block;
}

.brand-mark {
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--brand);
}

.brand-copy {
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(6px, 1.6vw, 18px);
  font-size: 15px;
  font-weight: 600;
}

.nav-links > a {
  padding: 8px 10px;
  color: var(--ink);
  border-radius: 8px;
  transition: color 0.15s ease;
}

.nav-links > a:hover,
.nav-links > a:focus-visible {
  color: var(--brand);
}

/* nav dropdown */
.nav-item {
  position: relative;
}

.nav-trigger {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 10px;
  font: inherit;
  font-weight: 700;
  color: var(--ink);
  background: none;
  border: 0;
  border-radius: 8px;
  cursor: pointer;
  transition: color 0.15s ease;
}

.nav-trigger:hover,
.nav-item:hover .nav-trigger,
.nav-item.is-open .nav-trigger {
  color: var(--brand);
}

.nav-trigger .caret {
  width: 10px;
  height: 10px;
  transition: transform 0.2s ease;
}

.nav-item:hover .nav-trigger .caret,
.nav-item.is-open .nav-trigger .caret {
  transform: rotate(180deg);
}

.mega-menu {
  position: absolute;
  top: calc(100% + 14px);
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  width: max(420px, 30vw);
  max-width: 92vw;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.18s ease, transform 0.18s ease;
  z-index: 60;
}

.mega-menu::before {
  content: "";
  position: absolute;
  bottom: 100%;
  left: 0;
  right: 0;
  height: 16px;
}

.nav-item:hover .mega-menu,
.nav-item.is-open .mega-menu,
.nav-item:focus-within .mega-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.mega-inner {
  padding: 22px;
}

.mega-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.mega-head strong {
  font-size: 18px;
  color: var(--ink);
}

.mega-head span {
  font-size: 12px;
  font-weight: 700;
  color: var(--brand);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.mega-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.mega-grid a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 11px 13px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  transition: background 0.14s ease, color 0.14s ease;
}

.mega-grid a:hover,
.mega-grid a:focus-visible {
  background: #eef5fc;
  color: var(--brand);
}

.mega-grid a.is-all {
  grid-column: 1 / -1;
  background: var(--navy);
  color: #fff;
}

.mega-grid a.is-all:hover {
  background: var(--brand);
}

.mega-grid a .count {
  flex: none;
  min-width: 26px;
  padding: 1px 8px;
  text-align: center;
  font-size: 12px;
  font-weight: 800;
  color: var(--brand);
  background: #e8f2fb;
  border-radius: 999px;
}

.mega-grid a.is-all .count,
.mega-grid a:hover .count {
  color: #fff;
  background: rgba(255, 255, 255, 0.22);
}

.nav-toggle {
  display: none;
}

/* ============ Hero ============ */
.hero {
  position: relative;
  min-height: 440px;
  color: #fff;
  overflow: hidden;
  background: var(--navy);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 120% at 100% 0%, rgba(22, 167, 230, 0.45) 0%, rgba(11, 31, 51, 0) 55%),
    linear-gradient(90deg, rgba(11, 31, 51, 0.96) 0%, rgba(11, 31, 51, 0.82) 44%, rgba(11, 31, 51, 0.4) 100%),
    url("https://vfanvn.com/assets/img/products/be04/01.jpg") right center / contain no-repeat,
    var(--navy);
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  justify-items: center;
  align-items: center;
  gap: clamp(26px, 6vw, 80px);
  width: min(1240px, calc(100% - 44px));
  min-height: 440px;
  margin: 0 auto;
  padding: clamp(40px, 6vw, 68px) 0;
}

.hero-copy,
.hero-product,
.catalog-tools > *,
.overview-grid > *,
.contact-section > * {
  min-width: 0;
}

.section-kicker {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.hero .section-kicker {
  color: #6fd0f7;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

h1 {
  max-width: 760px;
  font-size: clamp(46px, 7vw, 82px);
  font-weight: 800;
}

h2 {
  font-size: clamp(30px, 4.4vw, 50px);
  font-weight: 800;
}

h3 {
  font-size: 21px;
  font-weight: 700;
}

.hero-lead {
  max-width: 640px;
  margin: 22px 0 0;
  color: rgba(255, 255, 255, 0.82);
  font-size: clamp(18px, 1.9vw, 23px);
  font-weight: 500;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.primary-link,
.secondary-link,
.learn-link,
.secondary-button,
.tab-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 11px 22px;
  border-radius: 999px;
  font: inherit;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}

.primary-link,
.learn-link {
  color: #fff;
  background: var(--brand);
}

.primary-link:hover,
.learn-link:hover {
  background: var(--accent);
}

.secondary-link {
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.5);
}

.secondary-link:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: #fff;
}

.hero-dots {
  display: flex;
  gap: 10px;
  margin-top: 80px;
}

.hero-dots span {
  width: 40px;
  height: 3px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.32);
}

.hero-dots span:first-child {
  background: var(--accent);
}

.hero-product {
  display: grid;
  justify-items: center;
  gap: 26px;
}

.hero-product > img {
  width: min(440px, 86%);
  max-height: 360px;
  object-fit: contain;
  filter: drop-shadow(0 30px 44px rgba(0, 0, 0, 0.5));
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  width: min(520px, 100%);
  overflow: hidden;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.06);
}

.hero-stats div {
  padding: 18px 14px;
  border-right: 1px solid rgba(255, 255, 255, 0.12);
}

.hero-stats div:last-child {
  border-right: 0;
}

.hero-stats strong {
  display: block;
  color: #fff;
  font-size: 32px;
  line-height: 1;
}

.hero-stats span {
  display: block;
  margin-top: 8px;
  color: rgba(255, 255, 255, 0.66);
  font-size: 12px;
}

/* ============ Notice band ============ */
.notice-band {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  align-items: center;
  justify-content: center;
  padding: 16px clamp(18px, 4vw, 58px);
  color: #fff;
  background: linear-gradient(90deg, var(--brand), var(--accent));
  font-size: 15px;
}

.notice-band span {
  color: rgba(255, 255, 255, 0.9);
}

/* ============ Stages ============ */
.stage {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 0.9fr);
  align-items: center;
  min-height: 520px;
  overflow: hidden;
}

.stage-light {
  grid-template-columns: minmax(360px, 0.9fr) minmax(0, 1fr);
  color: var(--ink);
  background: #fff;
}

.stage-dark {
  color: #fff;
  background:
    radial-gradient(100% 120% at 0% 0%, rgba(22, 167, 230, 0.3) 0%, rgba(11, 31, 51, 0) 50%),
    linear-gradient(90deg, var(--navy) 0%, var(--navy-soft) 100%);
}

.stage-copy {
  max-width: 640px;
  padding: clamp(46px, 7vw, 88px) clamp(24px, 7vw, 104px);
}

.stage-copy p:not(.section-kicker) {
  margin: 20px 0 0;
  color: inherit;
  opacity: 0.78;
  font-size: clamp(17px, 1.8vw, 21px);
}

.stage-copy .learn-link {
  margin-top: 28px;
}

.stage-media {
  display: grid;
  place-items: center;
  min-height: 520px;
  padding: 38px;
}

.stage-dark .stage-media {
  background: rgba(255, 255, 255, 0.04);
}

.stage-light .stage-media {
  background: #eef3f9;
}

.stage-media img {
  width: min(500px, 90%);
  max-height: 420px;
  object-fit: contain;
  filter: drop-shadow(0 24px 36px rgba(0, 0, 0, 0.22));
}

/* ============ Layout sections ============ */
.groups-section,
.catalog-section,
.contact-section {
  width: min(1240px, calc(100% - 44px));
  margin: 0 auto;
}

.groups-section,
.catalog-section {
  padding: clamp(56px, 8vw, 96px) 0;
}

.groups-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 20px;
}

.group-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.group-card:hover,
.group-card:focus-within {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: #cfe0f1;
}

.group-open {
  display: flex;
  flex-direction: column;
  width: 100%;
  padding: 0;
  text-align: left;
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

.group-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-top: auto;
  padding: 13px 20px;
  border-top: 1px solid var(--line);
  color: var(--brand);
  font-size: 13px;
  font-weight: 700;
  transition: background 0.15s ease;
}

.group-link:hover,
.group-link:focus-visible {
  background: #eef5fc;
  color: var(--brand-dark);
}

.group-media {
  display: grid;
  place-items: center;
  aspect-ratio: 4 / 3;
  background: #eef3f9;
}

.group-media img {
  width: 100%;
  height: 100%;
  padding: 22px;
  object-fit: contain;
}

.group-info {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px 16px;
}

.group-brand {
  align-self: flex-start;
  margin-bottom: 2px;
  padding: 3px 11px;
  color: #fff;
  background: var(--brand);
  border-radius: 999px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.group-brand.is-mojawa {
  background: var(--teal);
}

.group-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.group-count {
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
}

.overview-copy,
.section-heading {
  max-width: 780px;
  margin-bottom: 32px;
}

.overview-copy p:not(.section-kicker),
.section-heading p:not(.section-kicker) {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 17px;
}

.overview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.overview-grid article {
  min-width: 0;
  padding: 30px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: var(--shadow-soft);
}

.overview-grid article > span {
  display: inline-flex;
  margin-bottom: 12px;
  padding: 4px 12px;
  color: #fff;
  background: var(--brand);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.03em;
}

.overview-grid article > p {
  margin: 14px 0 0;
  color: var(--muted);
}

.showcase-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.showcase-item {
  min-width: 0;
  margin: 0;
  overflow: hidden;
  background: #f3f7fb;
  border: 1px solid var(--line);
  border-radius: 12px;
}

.showcase-item img {
  width: 100%;
  height: 150px;
  padding: 12px;
  object-fit: contain;
}

.showcase-caption {
  padding: 0 12px 12px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.clean-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.clean-list li {
  padding: 13px;
  background: #f3f7fb;
  border: 1px solid var(--line);
  border-radius: 12px;
  font-weight: 700;
}

.clean-list span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 500;
}

/* ============ Catalog ============ */
.catalog-section {
  border-top: 1px solid var(--line);
}

.catalog-heading {
  margin-bottom: 28px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-bottom: 16px;
  padding: 9px 16px;
  color: var(--brand);
  background: #eef5fc;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  transition: background 0.15s ease;
}

.back-link:hover,
.back-link:focus-visible {
  background: #dcebf9;
}

.catalog-heading .result-line {
  margin-top: 10px;
}

.catalog-source {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  padding: 9px 16px;
  color: var(--brand);
  background: #eef5fc;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  transition: background 0.15s ease;
}

.catalog-source:hover,
.catalog-source:focus-visible {
  background: #dcebf9;
  color: var(--brand-dark);
}

.catalog-tools {
  display: grid;
  grid-template-columns: 1.05fr minmax(250px, 1.1fr) minmax(210px, 0.7fr);
  gap: 14px;
  align-items: end;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: var(--shadow-soft);
}

.brand-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tab-button,
.secondary-button {
  color: var(--ink);
  background: #eef3f9;
  border: 1px solid var(--line);
}

.tab-button.is-active {
  color: #fff;
  border-color: var(--brand);
  background: var(--brand);
}

.search-field,
.select-field {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

input,
select {
  width: 100%;
  min-height: 46px;
  padding: 0 14px;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  font: inherit;
}

input:focus,
select:focus,
button:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 3px solid rgba(14, 118, 188, 0.28);
  outline-offset: 2px;
}

.result-line {
  min-height: 28px;
  margin-top: 20px;
  color: var(--muted);
  font-size: 14px;
}

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

.product-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: #cfe0f1;
}

.product-media {
  display: grid;
  place-items: center;
  aspect-ratio: 4 / 3;
  background: #eef3f9;
}

.product-media img {
  width: 100%;
  height: 100%;
  padding: 22px;
  object-fit: contain;
}

.product-body {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 13px;
  padding: 20px;
}

.eyebrow-row {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.eyebrow-row span,
.tag {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  min-height: 24px;
  padding: 4px 10px;
  overflow-wrap: anywhere;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 800;
  line-height: 1.2;
}

.eyebrow-row span:first-child {
  color: #fff;
  background: var(--brand);
}

.eyebrow-row span:last-child {
  color: var(--ink);
  background: #e8eef5;
}

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

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.tag {
  color: var(--brand-dark);
  background: #e8f2fb;
}

.detail-stack {
  display: grid;
  gap: 8px;
  margin-top: auto;
}

details {
  border-top: 1px solid var(--line);
  padding-top: 10px;
}

summary {
  color: var(--ink);
  font-weight: 800;
  cursor: pointer;
}

.spec-list {
  display: grid;
  gap: 7px;
  margin: 10px 0 0;
  padding-left: 18px;
  color: var(--muted);
}

.source-link {
  display: inline-flex;
  width: fit-content;
  min-height: 38px;
  align-items: center;
  justify-content: center;
  margin-top: 4px;
  padding: 9px 16px;
  color: #fff;
  background: var(--brand);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 800;
  transition: background 0.15s ease;
}

.source-link:hover {
  background: var(--brand-dark);
}

.load-row {
  display: flex;
  justify-content: center;
  margin-top: 28px;
}

.secondary-button:hover,
.secondary-button:focus-visible,
.tab-button:not(.is-active):hover {
  border-color: var(--brand);
  color: var(--brand);
}

/* ============ Excel table ============ */
.table-wrap {
  overflow-x: auto;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: var(--shadow-soft);
}

table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
  font-size: 14px;
}

th,
td {
  padding: 13px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

th {
  color: #fff;
  background: var(--navy);
  font-size: 12px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

tbody tr:nth-child(even) td {
  background: #f7fafd;
}

tbody tr:last-child td {
  border-bottom: 0;
}

/* ============ Contact ============ */
.contact-section {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(320px, 1fr);
  gap: clamp(24px, 5vw, 64px);
  margin-bottom: 56px;
  padding: clamp(32px, 5vw, 52px);
  color: #fff;
  background:
    radial-gradient(120% 120% at 100% 0%, rgba(22, 167, 230, 0.36) 0%, rgba(11, 31, 51, 0) 55%),
    linear-gradient(120deg, var(--navy), var(--navy-soft));
  border-radius: 20px;
}

.contact-section p {
  margin: 14px 0 0;
  color: rgba(255, 255, 255, 0.78);
}

address {
  display: grid;
  gap: 12px;
  color: rgba(255, 255, 255, 0.84);
  font-style: normal;
}

address a {
  color: #fff;
  font-weight: 800;
}

address a:hover {
  color: #7fd3f6;
}

/* ============ Footer ============ */
.site-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  justify-content: space-between;
  padding: 24px clamp(18px, 4vw, 58px);
  color: rgba(255, 255, 255, 0.7);
  background: var(--navy);
  font-size: 14px;
}

.site-footer a {
  color: #7fd3f6;
  font-weight: 700;
}

.site-footer a:hover {
  color: #abe3fb;
}

.brand-note a,
.section-heading p a {
  color: var(--brand);
  font-weight: 700;
}

.brand-note a:hover,
.section-heading p a:hover {
  color: var(--brand-dark);
}

.mega-foot {
  display: block;
  margin: 16px 0 0;
  padding: 14px 0 2px;
  border-top: 1px solid var(--line);
  color: var(--brand);
  font-size: 13px;
  font-weight: 700;
}

.mega-foot:hover,
.mega-foot:focus-visible {
  color: var(--brand-dark);
}

.empty-state {
  grid-column: 1 / -1;
  padding: 28px;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
}

/* ============ Responsive ============ */
@media (max-width: 980px) {
  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    color: var(--ink);
    background: #eef3f9;
    border: 1px solid var(--line);
    border-radius: 10px;
    cursor: pointer;
  }

  .nav-links {
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 14px clamp(18px, 4vw, 48px) 20px;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow);
    max-height: calc(100vh - 70px);
    overflow-y: auto;
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.18s ease, transform 0.18s ease;
  }

  .nav-links.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-item {
    position: static;
  }

  .nav-trigger,
  .nav-links > a {
    width: 100%;
    justify-content: space-between;
    padding: 12px 8px;
    border-radius: 8px;
  }

  .mega-menu,
  .nav-item.is-open .mega-menu,
  .nav-item:hover .mega-menu,
  .nav-item:focus-within .mega-menu {
    position: static;
    width: 100%;
    max-width: none;
    transform: none;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    box-shadow: none;
    border: 0;
    border-radius: 0;
    display: none;
  }

  .mega-menu::before {
    display: none;
  }

  .nav-item.is-open .mega-menu {
    display: block;
  }

  .nav-item:hover .mega-menu {
    opacity: 1;
  }

  .mega-inner {
    padding: 6px 8px 12px;
  }

  .hero,
  .hero-inner {
    min-height: auto;
  }

  .hero-inner,
  .stage,
  .stage-light,
  .overview-grid,
  .catalog-tools,
  .contact-section {
    grid-template-columns: 1fr;
  }

  .hero-inner {
    padding: 54px 0;
  }

  .hero-dots {
    margin-top: 40px;
  }

  .stage-media,
  .stage {
    min-height: auto;
  }

  .stage-light .stage-media {
    order: 2;
  }

  .product-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .header-inner {
    min-height: 62px;
  }

  .nav-links {
    top: 62px;
  }

  .brand-copy {
    display: none;
  }

  .hero-inner,
  .series-overview,
  .catalog-section,
  .excel-section,
  .contact-section {
    width: min(100% - 24px, 1240px);
  }

  h1 {
    font-size: clamp(38px, 11vw, 52px);
  }

  h2 {
    font-size: clamp(28px, 9vw, 40px);
  }

  .hero-lead,
  .stage-copy p:not(.section-kicker) {
    font-size: 17px;
  }

  .hero-lead {
    max-width: 32ch;
    overflow-wrap: break-word;
  }

  .hero-product > img {
    width: min(300px, 82%);
  }

  .hero-stats,
  .showcase-strip,
  .clean-list,
  .product-grid,
  .mega-grid {
    grid-template-columns: 1fr;
  }

  .stage-copy {
    padding: 42px 24px;
  }

  .stage-media {
    padding: 28px 18px 42px;
  }

  .overview-grid article {
    padding: 22px;
  }

  .catalog-tools {
    padding: 16px;
  }

  .contact-section {
    padding: 28px 22px;
  }
}