/* ============================================
   Kenvo Electronics - Design System
   Black & White Minimalist Style
   ============================================ */

/* ===== CSS Variables ===== */
:root {
  /* Colors */
  --color-black: #000000;
  --color-white: #ffffff;
  --color-gray-900: #1a1a1a;
  --color-gray-800: #2d2d2d;
  --color-gray-700: #404040;
  --color-gray-600: #666666;
  --color-gray-500: #888888;
  --color-gray-400: #aaaaaa;
  --color-gray-300: #cccccc;
  --color-gray-200: #e0e0e0;
  --color-gray-100: #f0f0f0;
  --color-gray-50: #fafafa;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", "Segoe UI", Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Consolas", monospace;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;
  --space-2xl: 8rem;

  /* Layout */
  --container-max: 1200px;
  --container-narrow: 800px;
  --nav-height: 64px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.6s cubic-bezier(0.23, 1, 0.32, 1);

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.12);
}

/* ===== Reset ===== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  color: var(--color-gray-900);
  background: var(--color-white);
  line-height: 1.6;
  font-size: 16px;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

ul {
  list-style: none;
}

/* ===== Container ===== */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.container-narrow {
  max-width: var(--container-narrow);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Navigation ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  z-index: 1000;
  transition: all var(--transition-base);
  border-bottom: 1px solid transparent;
}

.navbar.scrolled {
  border-bottom-color: var(--color-gray-200);
  background: rgba(255, 255, 255, 0.95);
}

.navbar-inner {
  max-width: var(--container-max);
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1.65rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  color: var(--color-black);
  display: flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
}

.nav-logo span {
  font-weight: 300;
  color: var(--color-gray-500);
  font-size: 1.05rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.5rem;
}

.nav-links a {
  font-size: 1rem;
  color: var(--color-gray-700);
  font-weight: 500;
  position: relative;
  padding: 4px 0;
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--color-black);
  transition: width var(--transition-base);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-black);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-cta {
  padding: 8px 20px;
  background: var(--color-black);
  color: var(--color-white) !important;
  border-radius: 100px;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.nav-cta:hover {
  background: var(--color-gray-800);
  transform: scale(1.03);
}

.nav-cta::after {
  display: none;
}

/* Mobile menu toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-black);
  transition: all var(--transition-base);
  border-radius: 2px;
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== Hero Section ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: var(--nav-height);
}

.hero-dark {
  background: var(--color-black);
  color: var(--color-white);
}

.hero-light {
  background: var(--color-white);
  color: var(--color-black);
}

.hero-content {
  max-width: 1140px;
  padding: 0 24px;
  margin: 0 auto;
  text-align: center;
  z-index: 2;
  position: relative;
}

.hero-eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  opacity: 0.5;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: clamp(1.6rem, 3.4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 1.5rem;
  max-width: 100%;
  white-space: nowrap;
}

.hero-subtitle {
  font-size: clamp(1rem, 1.4vw, 1.2rem);
  font-weight: 400;
  line-height: 1.5;
  opacity: 0.7;
  margin-bottom: 2.5rem;
  max-width: 920px;
  margin-left: auto;
  margin-right: auto;
  white-space: pre-line;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: 100px;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
  font-family: inherit;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-black);
  color: var(--color-white);
}

.btn-primary:hover {
  background: var(--color-gray-800);
  transform: scale(1.03);
}

.btn-secondary {
  background: var(--color-white);
  color: var(--color-black);
  border: 1px solid var(--color-gray-300);
}

.btn-secondary:hover {
  background: var(--color-gray-50);
  border-color: var(--color-gray-400);
  transform: scale(1.03);
}

.btn-dark .btn-primary {
  background: var(--color-white);
  color: var(--color-black);
}

.btn-dark .btn-primary:hover {
  background: var(--color-gray-100);
}

.btn-dark .btn-secondary {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255, 255, 255, 0.3);
}

.btn-dark .btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
}

.btn-lg {
  padding: 14px 36px;
  font-size: 1.05rem;
}

/* ===== Section Base ===== */
.section {
  padding: var(--space-2xl) 0;
}

.section-sm {
  padding: var(--space-xl) 0;
}

.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-gray-500);
  margin-bottom: 1rem;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 1.5rem;
}

.section-subtitle {
  font-size: 1.15rem;
  color: var(--color-gray-600);
  line-height: 1.6;
  max-width: 640px;
}

.section-header {
  margin-bottom: var(--space-lg);
}

.section-header-center {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

.section-header-center .section-subtitle {
  margin-left: auto;
  margin-right: auto;
}

/* ===== Feature Grid ===== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0;
  border-top: 1px solid var(--color-gray-200);
  border-left: 1px solid var(--color-gray-200);
}

.feature-card {
  padding: 3rem 2.5rem;
  border-right: 1px solid var(--color-gray-200);
  border-bottom: 1px solid var(--color-gray-200);
  transition: background var(--transition-base);
}

.feature-card:hover {
  background: var(--color-gray-50);
}

.feature-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-icon svg {
  width: 100%;
  height: 100%;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--color-gray-600);
  line-height: 1.6;
}

/* ===== Stats Section ===== */
.stats {
  background: var(--color-black);
  color: var(--color-white);
  padding: var(--space-xl) 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  text-align: center;
}

.stat-item {
  padding: 1.5rem;
}

.stat-number {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* ===== Product Cards ===== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.product-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: 16px;
  overflow: hidden;
  transition: all var(--transition-base);
  cursor: pointer;
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-gray-300);
}

.product-card-image {
  width: 100%;
  aspect-ratio: 16 / 10;
  background: var(--color-gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.product-card-image svg {
  width: 60%;
  height: 60%;
  transition: transform var(--transition-slow);
}

.product-card:hover .product-card-image svg {
  transform: scale(1.1);
}

.product-card-body {
  padding: 2rem;
}

.product-card-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-gray-500);
  margin-bottom: 0.75rem;
}

.product-card-title {
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.product-card-desc {
  font-size: 0.95rem;
  color: var(--color-gray-600);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.product-card-features {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.product-tag {
  font-size: 0.75rem;
  padding: 4px 12px;
  background: var(--color-gray-100);
  border-radius: 100px;
  color: var(--color-gray-700);
}

/* ===== Split Section ===== */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  align-items: stretch;
  min-height: 600px;
}

.split-content {
  padding: var(--space-xl) 4rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.split-visual {
  background: var(--color-gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.split-dark .split-content {
  background: var(--color-black);
  color: var(--color-white);
}

.split-dark .split-visual {
  background: var(--color-white);
}

/* ===== Image Grid (for product images inside content) ===== */
.img-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 1.5rem;
  clear: both;
}

.img-card {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
  background: var(--color-gray-50);
  border: 1px solid var(--color-gray-100);
}

.img-card img {
  width: 100%;
  height: 200px;
  object-fit: contain;
  padding: 0.5rem;
  display: block;
}

.img-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.78);
  color: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0.75rem;
  text-align: center;
  opacity: 0;
  transition: opacity 0.25s ease;
  pointer-events: none;
}

.img-card:hover .img-overlay {
  opacity: 1;
}

.img-overlay strong {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  line-height: 1.3;
}

.img-overlay span {
  font-size: 0.75rem;
  opacity: 0.85;
  line-height: 1.4;
}

@media (max-width: 900px) {
  .img-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-title {
    white-space: normal;
    font-size: clamp(1.5rem, 4.4vw, 2.2rem);
    line-height: 1.2;
  }
}

@media (max-width: 640px) {
  .img-grid {
    grid-template-columns: 1fr;
  }
  .img-card img {
    height: 220px;
  }
}

/* ===== MOQ Banner ===== */
.moq-banner {
  background: var(--color-black);
  color: var(--color-white);
  text-align: center;
  padding: 1.25rem 2rem;
  margin-top: 2.5rem;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.moq-banner a {
  color: var(--color-white);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 600;
}

.moq-banner a:hover {
  opacity: 0.8;
}

/* ===== Timeline ===== */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--color-gray-200);
}

.timeline-item {
  position: relative;
  padding-left: 2.5rem;
  padding-bottom: 3rem;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: -5px;
  top: 4px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--color-black);
  border: 2px solid var(--color-white);
  box-shadow: 0 0 0 1px var(--color-gray-200);
}

.timeline-year {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--color-gray-500);
  margin-bottom: 0.5rem;
}

.timeline-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.timeline-desc {
  font-size: 0.95rem;
  color: var(--color-gray-600);
  line-height: 1.6;
}

/* ===== Certification Badges ===== */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
}

.cert-item {
  text-align: center;
  padding: 2.5rem 2rem;
  border: 1px solid var(--color-gray-200);
  border-radius: 16px;
  transition: all var(--transition-base);
}

.cert-item:hover {
  border-color: var(--color-gray-400);
  transform: translateY(-2px);
}

.cert-badge {
  width: 64px;
  height: 64px;
  margin: 0 auto 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--color-black);
  border-radius: 50%;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.cert-name {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.cert-desc {
  font-size: 0.9rem;
  color: var(--color-gray-600);
}

/* ===== Application Areas ===== */
.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.app-card {
  padding: 2rem;
  background: var(--color-gray-50);
  border-radius: 16px;
  transition: all var(--transition-base);
  border: 1px solid transparent;
}

.app-card:hover {
  background: var(--color-white);
  border-color: var(--color-gray-200);
  box-shadow: var(--shadow-md);
}

.app-icon {
  width: 40px;
  height: 40px;
  margin-bottom: 1rem;
  color: var(--color-black);
}

.app-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.app-desc {
  font-size: 0.9rem;
  color: var(--color-gray-600);
  line-height: 1.5;
}

/* ===== Contact Form ===== */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.contact-info-item {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
}

.contact-info-icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-gray-100);
  border-radius: 12px;
}

.contact-info-label {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-gray-500);
  margin-bottom: 0.25rem;
}

.contact-info-value {
  font-size: 1.05rem;
  color: var(--color-gray-900);
  line-height: 1.5;
}

.contact-form {
  background: var(--color-gray-50);
  padding: 3rem;
  border-radius: 20px;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-gray-700);
  margin-bottom: 0.5rem;
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-gray-300);
  border-radius: 10px;
  font-size: 0.95rem;
  font-family: inherit;
  background: var(--color-white);
  transition: border-color var(--transition-fast);
  outline: none;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--color-black);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-success {
  display: none;
  padding: 1rem 1.5rem;
  background: var(--color-black);
  color: var(--color-white);
  border-radius: 10px;
  font-size: 0.9rem;
  margin-top: 1rem;
}

.form-success.show {
  display: block;
}

/* ===== CTA Section ===== */
.cta-section {
  background: var(--color-black);
  color: var(--color-white);
  padding: var(--space-2xl) 0;
  text-align: center;
}

.cta-section .section-title {
  color: var(--color-white);
}

.cta-section .section-subtitle {
  color: rgba(255, 255, 255, 0.6);
}

/* ===== Footer ===== */
.footer {
  background: var(--color-gray-50);
  border-top: 1px solid var(--color-gray-200);
  padding: var(--space-xl) 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand .nav-logo {
  margin-bottom: 1rem;
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--color-gray-600);
  line-height: 1.6;
  max-width: 320px;
}

.footer-col h4 {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-gray-900);
  margin-bottom: 1.25rem;
}

.footer-col ul li {
  margin-bottom: 0.75rem;
}

.footer-col ul li a {
  font-size: 0.9rem;
  color: var(--color-gray-600);
}

.footer-col ul li a:hover {
  color: var(--color-black);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 2rem;
  border-top: 1px solid var(--color-gray-200);
  font-size: 0.85rem;
  color: var(--color-gray-500);
}

.footer-bottom a:hover {
  color: var(--color-black);
}

/* ===== Animations ===== */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-up-delay-1 { transition-delay: 0.1s; }
.fade-up-delay-2 { transition-delay: 0.2s; }
.fade-up-delay-3 { transition-delay: 0.3s; }
.fade-up-delay-4 { transition-delay: 0.4s; }

/* ===== Selection Guide — Steps ===== */
.guide-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-top: 3rem;
}

.step-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: 12px;
  padding: 2rem 1.5rem;
  position: relative;
  transition: transform 0.35s ease, box-shadow 0.35s ease, border-color 0.35s ease;
  opacity: 0;
  transform: translateY(24px);
}

.step-card.visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.step-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.08);
  border-color: var(--color-black);
}

.step-number {
  font-family: var(--font-heading);
  font-size: 3.25rem;
  font-weight: 300;
  line-height: 1;
  color: var(--color-gray-200);
  margin-bottom: 1rem;
  letter-spacing: -0.04em;
  transition: color 0.35s ease;
}

.step-card:hover .step-number {
  color: var(--color-black);
}

.step-title {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--color-black);
  margin-bottom: 0.6rem;
}

.step-desc {
  font-size: 0.92rem;
  line-height: 1.55;
  color: var(--color-gray-600);
}

@media (max-width: 900px) {
  .guide-steps {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 560px) {
  .guide-steps {
    grid-template-columns: 1fr;
  }
}

/* ===== Spec Matrix (Selection Guide) ===== */
.spec-matrix-wrap {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: 16px;
  padding: 0;
  overflow: hidden;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.04);
  margin-top: 2.5rem;
}

/* Wirewound matrix: group header between sub-tables */
.matrix-group-header {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-top: 2.5rem;
  margin-bottom: 0;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--color-gray-200);
}
.matrix-group-header:first-of-type {
  margin-top: 0;
}
.matrix-group-header .group-num {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-gray-500);
  flex-shrink: 0;
}
.matrix-group-header .group-name {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-black);
  letter-spacing: -0.01em;
}
.matrix-group-header .group-note {
  font-size: 0.85rem;
  color: var(--color-gray-500);
  margin-left: auto;
  text-align: right;
}
.matrix-group-header + .spec-matrix-wrap {
  margin-top: 0.5rem;
}

.spec-matrix-scroll {
  /* Legacy wrapper retained in case external links hard-code the class.
     No horizontal scrollbar: matrix is sized to fit its parent. */
  overflow: visible;
}

.spec-matrix {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
  table-layout: auto;
}

.spec-matrix thead th {
  background: var(--color-black);
  color: var(--color-white);
  text-align: left;
  font-weight: 500;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.85rem 0.6rem;
  white-space: nowrap;
  position: sticky;
  top: 0;
  z-index: 1;
}

.spec-matrix thead th:first-child {
  padding-left: 0.85rem;
}

.spec-matrix thead th:last-child {
  padding-right: 0.85rem;
}

.spec-matrix tbody tr {
  border-bottom: 1px solid var(--color-gray-100);
  transition: background-color 0.25s ease, transform 0.25s ease;
}

.spec-matrix tbody tr:last-child {
  border-bottom: none;
}

.spec-matrix tbody tr:hover {
  background-color: var(--color-gray-50);
}

.spec-matrix tbody td {
  padding: 0.7rem 0.6rem;
  color: var(--color-gray-700);
  vertical-align: middle;
  font-variant-numeric: tabular-nums;
  line-height: 1.35;
}

.spec-matrix tbody td:first-child {
  padding-left: 0.85rem;
}

.spec-matrix tbody td:last-child {
  padding-right: 0.85rem;
  white-space: normal;
  min-width: 9rem;
}

.spec-matrix tbody td.series-name {
  font-weight: 600;
  color: var(--color-black);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.spec-matrix tbody td.series-tag {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-gray-500);
}

/* ===== Page Hero (inner pages) ===== */
.page-hero {
  padding: calc(var(--nav-height) + var(--space-xl)) 0 var(--space-lg);
  text-align: center;
}

.page-hero-dark {
  background: var(--color-black);
  color: var(--color-white);
}

.page-hero .section-subtitle {
  margin-left: auto;
  margin-right: auto;
}

/* ===== Breadcrumb ===== */
.breadcrumb {
  display: flex;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--color-gray-500);
  margin-bottom: 1.5rem;
  justify-content: center;
}

.breadcrumb a:hover {
  color: var(--color-black);
}

/* ===== Download Section ===== */
.download-section {
  padding: 2.5rem;
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: 16px;
  margin-top: 2rem;
}

.download-section-dark .split-content .download-section {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.15);
}

.download-title {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-gray-500);
  margin-bottom: 1.25rem;
}

.download-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.download-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  background: var(--color-gray-50);
  border-radius: 10px;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

.download-item:hover {
  border-color: var(--color-gray-300);
  background: var(--color-white);
  box-shadow: var(--shadow-sm);
}

.download-item-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.download-item-icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-black);
  border-radius: 8px;
  color: var(--color-white);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.download-item-name {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-gray-900);
}

.download-item-meta {
  font-size: 0.75rem;
  color: var(--color-gray-500);
  margin-top: 2px;
}

.download-item-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-black);
  padding: 6px 16px;
  border: 1px solid var(--color-gray-300);
  border-radius: 100px;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.download-item-link:hover {
  background: var(--color-black);
  color: var(--color-white);
  border-color: var(--color-black);
}

/* ===== Docs Table (dedicated downloads page) ===== */
.docs-table {
  width: 100%;
  border-collapse: collapse;
}

.docs-table th {
  text-align: left;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-gray-500);
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--color-gray-200);
}

.docs-table td {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--color-gray-100);
  font-size: 0.9rem;
  color: var(--color-gray-700);
}

.docs-table tr:hover td {
  background: var(--color-gray-50);
}

.docs-table .doc-name {
  font-weight: 500;
  color: var(--color-gray-900);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.docs-table .doc-badge {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--color-gray-100);
  color: var(--color-gray-600);
  letter-spacing: 0.05em;
}

.docs-table .doc-badge-pdf {
  background: #1a1a1a;
  color: #fff;
}

/* ===== Responsive ===== */
@media (max-width: 968px) {
  .split {
    grid-template-columns: 1fr;
  }

  .split-content {
    padding: var(--space-lg) 2rem;
  }

  .split-visual {
    min-height: 300px;
  }

  .contact-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  /* The .navbar above uses backdrop-filter, which creates a containing block for
     fixed-position descendants. So .nav-links must NOT rely on `bottom: 0` to fill
     the viewport — that would collapse to ~0px tall inside the 64px-tall navbar.
     Use an explicit height instead. Also bump z-index above .navbar (1000). */
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    height: calc(100vh - var(--nav-height));
    width: 100vw;
    background: var(--color-white);
    z-index: 1100;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    padding: 3rem 2rem;
    gap: 2rem;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    transform: translateX(100%);
    transition: transform var(--transition-base);
  }

  .nav-links.open {
    transform: translateX(0);
  }

  .nav-links a {
    font-size: 1.5rem;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-cta {
    margin-top: 1rem;
  }

  .section {
    padding: var(--space-xl) 0;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .feature-card {
    padding: 2rem 1.5rem;
  }

  .contact-form {
    padding: 2rem 1.5rem;
  }

  .product-grid {
    grid-template-columns: 1fr;
  }

  .download-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }

  .download-item-link {
    width: 100%;
    justify-content: center;
  }

  .download-section {
    padding: 1.5rem;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions .btn {
    width: 100%;
    justify-content: center;
  }

  .container,
  .container-narrow {
    padding: 0 16px;
  }
}

/* ===== Varistor Product Card List (scoped) ===== */
.vp-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
}
.vp-card {
  border: 1px solid var(--color-gray-200, #e5e5e5);
  border-radius: 8px;
  padding: 0.85rem 1rem;
  background: var(--color-white);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.vp-card:hover {
  border-color: var(--color-black);
  transform: translateY(-1px);
}
.vp-head {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 0.45rem;
  flex-wrap: wrap;
}
.vp-num {
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--color-gray-400);
  letter-spacing: 0.08em;
  font-variant-numeric: tabular-nums;
}
.vp-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-black);
  margin: 0;
  line-height: 1.2;
}
.vp-type {
  font-size: 0.65rem;
  color: var(--color-gray-500);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-left: auto;
}
.vp-desc {
  font-size: 0.78rem;
  color: var(--color-gray-600);
  line-height: 1.45;
  margin: 0 0 0.65rem 0;
}
.vp-specs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.3rem 0.5rem;
  margin: 0;
}
.vp-specs > div {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--color-gray-100, #f3f3f3);
  padding-top: 0.35rem;
}
.vp-specs dt {
  font-size: 0.6rem;
  color: var(--color-gray-400);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 1px;
}
.vp-specs dd {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-black);
  margin: 0;
  font-variant-numeric: tabular-nums;
}
@media (max-width: 1100px) {
  .vp-list { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 820px) {
  .vp-list { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
  .vp-list { grid-template-columns: 1fr; }
}