/* ============================================================
   NaikGroup9 — Shared Stylesheet
   Structure: variables → reset → layout → nav → components →
              sections → product pages → footer → responsive
   ============================================================ */

/* VARIABLES */
:root {
  --navy:       #1A2332;
  --navy-mid:   #243044;
  --navy-dark:  #111A26;
  --white:      #F8F7F4;
  --blue:       #5B9EC9;
  --blue-light: #8BBDD9;
  --amber:      #C8893A;
  --amber-dark: #b87c30;
  --grey:       #8A95A3;
  --grey-light: #D4D8DD;
  --grey-bg:    #EFF1F4;
  --text:       #1A2332;
  --body-bg:    #F8F7F4;
  box-sizing: border-box;
  padding-top:    env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

/* RESET */
*, *::before, *::after { box-sizing: inherit; margin: 0; padding: 0; }
html {
  scroll-padding-top: env(safe-area-inset-top, 0px);
  scroll-behavior: smooth;
}
html, body { height: 100%; }
body {
  background: var(--body-bg);
  color: var(--text);
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 18px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }

/* ============================================================
   NAVIGATION
   ============================================================ */
nav {
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  z-index: 100;
  background: var(--navy);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 48px;
  height: 68px;
}
.nav-logo {
  font-family: 'Barlow', sans-serif;
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--white);
  letter-spacing: 0.02em;
  text-decoration: none;
}
.nav-logo span { color: var(--blue); }

.nav-links {
  display: flex;
  gap: 36px;
  list-style: none;
  align-items: center;
}
.nav-links a {
  font-family: 'Barlow', sans-serif;
  font-weight: 400;
  font-size: 0.9rem;
  color: var(--grey-light);
  text-decoration: none;
  letter-spacing: 0.03em;
  transition: color 0.2s;
}
.nav-links a:hover,
.nav-links a.active { color: var(--white); }

/* Products dropdown */
.nav-dropdown { position: relative; }
.nav-dropdown > a { display: flex; align-items: center; gap: 5px; }
.nav-dropdown > a::after {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg);
  margin-top: -3px;
  transition: transform 0.2s;
}
.nav-dropdown:hover > a::after { transform: rotate(-135deg); margin-top: 3px; }
.dropdown-menu {
  position: absolute;
  top: calc(100% + 16px);
  left: -16px;
  background: var(--navy-mid);
  min-width: 220px;
  border-top: 2px solid var(--blue);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);
  transition: opacity 0.2s, transform 0.2s;
  z-index: 200;
}
.nav-dropdown:hover .dropdown-menu {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.dropdown-menu a {
  display: block;
  padding: 12px 20px;
  font-family: 'Barlow', sans-serif;
  font-size: 0.85rem;
  color: var(--grey-light);
  text-decoration: none;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: background 0.15s, color 0.15s;
}
.dropdown-menu a:last-child { border-bottom: none; }
.dropdown-menu a:hover { background: rgba(91,158,201,0.12); color: var(--white); }

.nav-cta {
  font-family: 'Barlow', sans-serif;
  font-weight: 600;
  font-size: 0.85rem;
  background: var(--amber);
  color: var(--white);
  border: none;
  padding: 10px 22px;
  cursor: pointer;
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: background 0.2s;
  white-space: nowrap;
}
.nav-cta:hover { background: var(--amber-dark); }

.nav-mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  margin: 5px 0;
  transition: 0.3s;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn-primary {
  font-family: 'Barlow', sans-serif;
  font-weight: 700;
  font-size: 1rem;
  background: var(--amber);
  color: var(--white);
  border: none;
  padding: 16px 36px;
  cursor: pointer;
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: background 0.2s;
  display: inline-block;
}
.btn-primary:hover { background: var(--amber-dark); }

.btn-ghost {
  font-family: 'Barlow', sans-serif;
  font-weight: 400;
  font-size: 1rem;
  background: transparent;
  color: var(--grey-light);
  border: 1.5px solid rgba(255,255,255,0.25);
  padding: 15px 32px;
  cursor: pointer;
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: border-color 0.2s, color 0.2s;
  display: inline-block;
}
.btn-ghost:hover { border-color: var(--white); color: var(--white); }

.btn-outline-navy {
  font-family: 'Barlow', sans-serif;
  font-weight: 600;
  font-size: 0.9rem;
  background: transparent;
  color: var(--navy);
  border: 1.5px solid var(--navy);
  padding: 12px 28px;
  cursor: pointer;
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: background 0.2s, color 0.2s;
  display: inline-block;
}
.btn-outline-navy:hover { background: var(--navy); color: var(--white); }

/* ============================================================
   SECTION BASICS
   ============================================================ */
section { padding: 96px 48px; }

.section-tag {
  font-family: 'Barlow', sans-serif;
  font-weight: 600;
  font-size: 0.8rem;
  color: var(--amber);
  letter-spacing: 0.1em;
  margin-bottom: 20px;
}

h2 {
  font-family: 'Barlow', sans-serif;
  font-weight: 800;
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--navy);
  margin-bottom: 24px;
  max-width: 680px;
}

.section-lead {
  font-size: 1.05rem;
  color: #4A5568;
  max-width: 580px;
  line-height: 1.8;
  margin-bottom: 56px;
}

/* ============================================================
   HERO (Homepage)
   ============================================================ */
.hero {
  background: var(--navy);
  color: var(--white);
  padding: 100px 48px 80px;
  position: relative;
  overflow: hidden;
  min-height: 88vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.hero::before {
  content: '';
  position: absolute;
  right: -80px;
  top: -80px;
  width: 640px;
  height: 640px;
  border-radius: 50%;
  background: radial-gradient(circle at 40% 40%, rgba(91,158,201,0.18) 0%, transparent 70%);
  pointer-events: none;
}
.hero-eyebrow {
  font-family: 'Barlow', sans-serif;
  font-weight: 300;
  font-size: 0.95rem;
  color: var(--blue-light);
  letter-spacing: 0.12em;
  margin-bottom: 28px;
  font-style: italic;
}
.hero-headline {
  font-family: 'Barlow', sans-serif;
  font-weight: 800;
  font-size: clamp(3.2rem, 7vw, 6.5rem);
  line-height: 0.95;
  letter-spacing: -0.02em;
  max-width: 760px;
  margin-bottom: 36px;
}
.hero-headline em { font-style: normal; color: var(--blue); }
.hero-body {
  font-weight: 300;
  font-size: 1.15rem;
  line-height: 1.75;
  max-width: 520px;
  color: var(--grey-light);
  margin-bottom: 48px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  align-items: center;
}

/* ============================================================
   STAT STRIP
   ============================================================ */
.stat-strip {
  background: var(--navy-mid);
  border-top: 1px solid rgba(255,255,255,0.08);
  display: flex;
  align-items: stretch;
  padding: 0 48px;
}
.stat-item {
  flex: 1;
  padding: 40px 0;
  border-right: 1px solid rgba(255,255,255,0.08);
  padding-right: 48px;
}
.stat-item:not(:first-child) { padding-left: 48px; }
.stat-item:last-child { border-right: none; }
.stat-number {
  font-family: 'Barlow', sans-serif;
  font-weight: 800;
  font-size: 3rem;
  color: var(--white);
  line-height: 1;
  margin-bottom: 6px;
}
.stat-number span { color: var(--blue); }
.stat-label {
  font-family: 'Barlow', sans-serif;
  font-weight: 300;
  font-size: 0.85rem;
  color: var(--grey);
  letter-spacing: 0.04em;
}

/* ============================================================
   ABOUT SECTION (Homepage)
   ============================================================ */
.about-section { background: var(--white); }
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}
.about-visual {
  position: relative;
  aspect-ratio: 4/3;
  background: var(--navy);
  overflow: hidden;
}
.about-visual-inner {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.fiber-grid {
  width: 100%;
  height: 100%;
  position: absolute;
  inset: 0;
  overflow: hidden;
}
.fiber-grid svg { width: 100%; height: 100%; opacity: 0.25; }
.cert-badge {
  position: absolute;
  bottom: 24px;
  left: 24px;
  background: var(--amber);
  padding: 14px 20px;
  display: flex;
  flex-direction: column;
}
.cert-badge strong {
  font-family: 'Barlow', sans-serif;
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--white);
  line-height: 1.2;
}
.cert-badge small {
  font-family: 'Barlow', sans-serif;
  font-weight: 300;
  font-size: 0.75rem;
  color: rgba(255,255,255,0.8);
  letter-spacing: 0.04em;
}
.feature-list {
  list-style: none;
  margin-top: 36px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.feature-list li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  font-size: 0.95rem;
  color: #4A5568;
}
.feature-list li::before {
  content: '';
  display: block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--amber);
  margin-top: 10px;
  flex-shrink: 0;
}

/* ============================================================
   PRODUCTS GRID (Homepage)
   ============================================================ */
.products-section { background: var(--grey-bg); }
.products-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 56px;
  flex-wrap: wrap;
  gap: 24px;
}
.products-header h2 { margin-bottom: 0; }
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
}
.product-card {
  background: var(--white);
  padding: 40px 36px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: background 0.2s;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
}
.product-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: var(--blue);
  transition: width 0.3s ease;
}
.product-card:hover { background: #F0F4F8; }
.product-card:hover::after { width: 100%; }
.product-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.product-icon svg { width: 40px; height: 40px; }
.product-name {
  font-family: 'Barlow', sans-serif;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--navy);
  line-height: 1.25;
}
.product-desc {
  font-size: 0.88rem;
  color: var(--grey);
  line-height: 1.65;
}
.product-cert {
  font-family: 'Barlow', sans-serif;
  font-weight: 600;
  font-size: 0.72rem;
  color: var(--blue);
  letter-spacing: 0.05em;
  margin-top: auto;
}
.product-link {
  font-family: 'Barlow', sans-serif;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--navy);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.product-link svg { transition: transform 0.2s; }
.product-card:hover .product-link svg { transform: translateX(4px); }

/* ============================================================
   CERT BAND
   ============================================================ */
.cert-band {
  background: var(--navy);
  padding: 56px 48px;
  display: flex;
  align-items: center;
  gap: 64px;
  flex-wrap: wrap;
}
.cert-band-label {
  font-family: 'Barlow', sans-serif;
  font-weight: 300;
  font-size: 0.85rem;
  color: var(--grey);
  letter-spacing: 0.06em;
  white-space: nowrap;
}
.cert-pills {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.cert-pill {
  font-family: 'Barlow', sans-serif;
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--white);
  border: 1.5px solid rgba(255,255,255,0.2);
  padding: 9px 20px;
  letter-spacing: 0.04em;
}

/* ============================================================
   WHY SECTION (Homepage)
   ============================================================ */
.why-section { background: var(--white); }
.why-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.why-items { display: flex; flex-direction: column; }
.why-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 24px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--grey-light);
}
.why-item + .why-item { margin-top: 40px; }
.why-item:last-child { border-bottom: none; padding-bottom: 0; }
.why-number {
  font-family: 'Barlow', sans-serif;
  font-weight: 800;
  font-size: 3rem;
  color: var(--grey-light);
  line-height: 1;
  padding-top: 4px;
}
.why-text h3 {
  font-family: 'Barlow', sans-serif;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--navy);
  margin-bottom: 8px;
  line-height: 1.3;
}
.why-text p { font-size: 0.9rem; color: var(--grey); line-height: 1.7; }
.why-image {
  background: var(--navy);
  aspect-ratio: 3/4;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.why-image-graphic { width: 80%; opacity: 0.6; }
.why-pullquote {
  position: absolute;
  bottom: 32px;
  left: 32px;
  right: 32px;
  background: rgba(91,158,201,0.15);
  border-left: 4px solid var(--blue);
  padding: 20px 24px;
  backdrop-filter: blur(4px);
}
.why-pullquote p {
  font-family: 'Source Serif 4', serif;
  font-style: italic;
  font-size: 1rem;
  color: var(--white);
  line-height: 1.6;
}

/* ============================================================
   CONTACT SECTION
   ============================================================ */
.contact-section { background: var(--navy); color: var(--white); }
.contact-section h2 { color: var(--white); }
.contact-section .section-tag { color: var(--blue-light); }
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
}
.contact-info { display: flex; flex-direction: column; gap: 40px; }
.contact-detail h4 {
  font-family: 'Barlow', sans-serif;
  font-weight: 600;
  font-size: 0.8rem;
  color: var(--grey);
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}
.contact-detail p, .contact-detail a {
  font-size: 1rem;
  color: var(--white);
  text-decoration: none;
  line-height: 1.65;
}
.contact-detail a:hover { color: var(--blue-light); }
.contact-form { display: flex; flex-direction: column; gap: 20px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 8px; }
.form-group label {
  font-family: 'Barlow', sans-serif;
  font-weight: 400;
  font-size: 0.8rem;
  color: var(--grey);
  letter-spacing: 0.04em;
}
.form-group input,
.form-group textarea,
.form-group select {
  background: rgba(255,255,255,0.06);
  border: 1.5px solid rgba(255,255,255,0.12);
  color: var(--white);
  padding: 14px 18px;
  font-family: 'Barlow', sans-serif;
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s;
  width: 100%;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus { border-color: var(--blue); }
.form-group textarea { resize: vertical; min-height: 130px; }
.form-group select option { background: var(--navy-mid); }
input::placeholder, textarea::placeholder { color: rgba(255,255,255,0.3); }
.btn-submit {
  font-family: 'Barlow', sans-serif;
  font-weight: 700;
  font-size: 1rem;
  background: var(--amber);
  color: var(--white);
  border: none;
  padding: 16px 36px;
  cursor: pointer;
  letter-spacing: 0.02em;
  align-self: flex-start;
  transition: background 0.2s;
}
.btn-submit:hover { background: var(--amber-dark); }
.form-success {
  display: none;
  color: var(--blue-light);
  font-family: 'Barlow', sans-serif;
  font-size: 0.9rem;
  padding-top: 8px;
}

/* ============================================================
   PRODUCT DETAIL PAGE STYLES
   ============================================================ */

/* Page hero — narrower, with breadcrumb */
.product-hero {
  background: var(--navy);
  color: var(--white);
  padding: 72px 48px 64px;
  position: relative;
  overflow: hidden;
}
.product-hero::before {
  content: '';
  position: absolute;
  right: -60px;
  top: -60px;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(91,158,201,0.15) 0%, transparent 70%);
  pointer-events: none;
}
.breadcrumb {
  font-family: 'Barlow', sans-serif;
  font-size: 0.8rem;
  color: var(--grey);
  margin-bottom: 32px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.breadcrumb a {
  color: var(--grey);
  text-decoration: none;
  transition: color 0.2s;
}
.breadcrumb a:hover { color: var(--white); }
.breadcrumb span { opacity: 0.4; }

.product-hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.product-hero-content {}
.product-hero h1 {
  font-family: 'Barlow', sans-serif;
  font-weight: 800;
  font-size: clamp(2.4rem, 5vw, 4rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}
.product-hero h1 em { font-style: normal; color: var(--blue); }
.product-hero-lead {
  font-size: 1.05rem;
  color: var(--grey-light);
  line-height: 1.75;
  max-width: 460px;
  margin-bottom: 40px;
}
.product-hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* Hero image panel */
.product-hero-image {
  position: relative;
  aspect-ratio: 4/3;
  overflow: hidden;
  background: var(--navy-mid);
}
.product-hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.85;
  transition: opacity 0.4s;
}
.product-hero-image:hover img { opacity: 1; }
.product-hero-image-fallback {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Quick spec strip under hero */
.spec-strip {
  background: var(--navy-mid);
  border-top: 1px solid rgba(255,255,255,0.08);
  display: flex;
  flex-wrap: wrap;
}
.spec-strip-item {
  flex: 1;
  min-width: 150px;
  padding: 24px 32px;
  border-right: 1px solid rgba(255,255,255,0.08);
}
.spec-strip-item:last-child { border-right: none; }
.spec-strip-label {
  font-family: 'Barlow', sans-serif;
  font-weight: 300;
  font-size: 0.72rem;
  color: var(--grey);
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}
.spec-strip-value {
  font-family: 'Barlow', sans-serif;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--white);
}

/* Overview section */
.product-overview { background: var(--white); }
.product-overview-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 80px;
  align-items: start;
}
.product-overview-body h3 {
  font-family: 'Barlow', sans-serif;
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--navy);
  margin-bottom: 16px;
  margin-top: 36px;
}
.product-overview-body h3:first-child { margin-top: 0; }
.product-overview-body p {
  font-size: 0.95rem;
  color: #4A5568;
  line-height: 1.85;
  max-width: 65ch;
}
.product-overview-body ul {
  list-style: none;
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.product-overview-body ul li {
  font-size: 0.9rem;
  color: #4A5568;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.product-overview-body ul li::before {
  content: '';
  display: block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--blue);
  margin-top: 9px;
  flex-shrink: 0;
}

/* Sidebar spec table */
.spec-table-card {
  background: var(--grey-bg);
  padding: 32px;
  position: sticky;
  top: 88px;
}
.spec-table-card h4 {
  font-family: 'Barlow', sans-serif;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--navy);
  letter-spacing: 0.04em;
  margin-bottom: 20px;
}
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}
.spec-table tr { border-bottom: 1px solid var(--grey-light); }
.spec-table tr:last-child { border-bottom: none; }
.spec-table td {
  padding: 10px 0;
  vertical-align: top;
  line-height: 1.4;
}
.spec-table td:first-child {
  font-family: 'Barlow', sans-serif;
  font-weight: 600;
  color: var(--grey);
  width: 45%;
  padding-right: 12px;
}
.spec-table td:last-child { color: var(--navy); font-weight: 400; }
.spec-cta {
  margin-top: 24px;
  display: block;
  text-align: center;
  font-family: 'Barlow', sans-serif;
  font-weight: 700;
  font-size: 0.9rem;
  background: var(--amber);
  color: var(--white);
  padding: 14px 24px;
  text-decoration: none;
  transition: background 0.2s;
}
.spec-cta:hover { background: var(--amber-dark); }

/* Image gallery */
.product-gallery { background: var(--grey-bg); }
.gallery-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 4px;
}
.gallery-item {
  overflow: hidden;
  background: var(--navy-mid);
  aspect-ratio: 4/3;
  position: relative;
}
.gallery-item.main {
  grid-row: 1 / 3;
  aspect-ratio: unset;
}
.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease, opacity 0.3s;
  opacity: 0.85;
}
.gallery-item:hover img { transform: scale(1.04); opacity: 1; }
.gallery-item-fallback {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

/* Applications section */
.applications-section { background: var(--white); }
.applications-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2px;
  margin-top: 48px;
}
.application-item {
  background: var(--grey-bg);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.application-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.application-name {
  font-family: 'Barlow', sans-serif;
  font-weight: 700;
  font-size: 1rem;
  color: var(--navy);
}
.application-desc {
  font-size: 0.82rem;
  color: var(--grey);
  line-height: 1.6;
}

/* Related products */
.related-section { background: var(--grey-bg); }
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  margin-top: 48px;
}

/* ============================================================
   FOOTER
   ============================================================ */
footer {
  background: var(--navy-dark);
  padding: 32px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-logo {
  font-family: 'Barlow', sans-serif;
  font-weight: 800;
  font-size: 1rem;
  color: var(--white);
  text-decoration: none;
}
.footer-logo span { color: var(--blue); }
footer p {
  font-family: 'Barlow', sans-serif;
  font-weight: 300;
  font-size: 0.8rem;
  color: var(--grey);
}
.footer-links {
  display: flex;
  gap: 28px;
  list-style: none;
}
.footer-links a {
  font-family: 'Barlow', sans-serif;
  font-size: 0.8rem;
  color: var(--grey);
  text-decoration: none;
}
.footer-links a:hover { color: var(--white); }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .product-overview-grid { grid-template-columns: 1fr; }
  .spec-table-card { position: static; }
  .applications-grid { grid-template-columns: repeat(2, 1fr); }
  .gallery-grid { grid-template-columns: 1fr 1fr; }
  .gallery-item.main { grid-row: auto; }
}

@media (max-width: 900px) {
  nav { padding: 0 24px; }
  .nav-links, .nav-cta { display: none; }
  .nav-mobile-toggle { display: block; }
  nav.open .nav-links {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--navy);
    padding: 40px 24px;
    gap: 28px;
    z-index: 200;
    overflow-y: auto;
  }
  nav.open .nav-links a { font-size: 1.2rem; }
  nav.open .nav-cta {
    display: block;
    margin-top: 16px;
    text-align: center;
    padding: 16px;
  }
  .dropdown-menu {
    position: static;
    opacity: 1;
    pointer-events: auto;
    transform: none;
    border-top: 1px solid rgba(255,255,255,0.1);
    margin-top: 8px;
    padding-left: 16px;
  }
  .nav-dropdown > a::after { display: none; }

  .hero { padding: 72px 24px 64px; min-height: auto; }
  .stat-strip { flex-direction: column; padding: 0 24px; }
  .stat-item { border-right: none; border-bottom: 1px solid rgba(255,255,255,0.08); padding: 32px 0; }
  .stat-item:not(:first-child) { padding-left: 0; }
  .stat-item:last-child { border-bottom: none; }

  section { padding: 64px 24px; }
  .about-grid, .why-grid, .contact-grid, .product-hero-grid { grid-template-columns: 1fr; gap: 48px; }
  .product-grid { grid-template-columns: 1fr 1fr; }
  .related-grid { grid-template-columns: 1fr 1fr; }
  .products-header { flex-direction: column; align-items: flex-start; }
  .cert-band { padding: 40px 24px; gap: 32px; }
  .form-row { grid-template-columns: 1fr; }
  footer { flex-direction: column; align-items: flex-start; padding: 32px 24px; }
  .product-hero { padding: 48px 24px; }
  .spec-strip { flex-direction: column; }
  .spec-strip-item { border-right: none; border-bottom: 1px solid rgba(255,255,255,0.08); }
  .gallery-grid { grid-template-columns: 1fr; }
  .applications-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 560px) {
  .product-grid { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr; }
  .hero-actions, .product-hero-actions { flex-direction: column; align-items: flex-start; }
  .hero-headline { font-size: 2.8rem; }
  .applications-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}