/* ==========================================================================
   SATURN ADHESIVE & CHEMICAL CORPORATION - HYPER-OPTIMIZED DESIGN SYSTEM
   Ultra-fast, accessible (WCAG AA/AAA), modern B2B manufacturing experience
   Brand Color: Saturn Logo Vermilion Orange (#E56125)
   ========================================================================== */

:root {
  /* Brand Palette - Direct match to Saturn Logo #E56125 */
  --color-brand-primary: #e56125;           /* Saturn Base Logo Vermilion */
  --color-brand-primary-hover: #d04f15;
  --color-brand-primary-dark: #b33f0d;
  --color-brand-light: #fff7ed;            /* Soft warm orange tint */
  --color-brand-light-border: #fed7aa;
  --color-brand-glow: rgba(229, 97, 37, 0.35);

  /* Deep Backgrounds (Obsidian / Dark Graphite) */
  --color-dark-bg: #090e17;                /* Space Obsidian */
  --color-dark-surface: #111827;           /* Slate 900 */
  --color-dark-card: #162032;              /* Elevated dark slate */
  --color-dark-border: rgba(255, 255, 255, 0.1);

  /* Warm Accent & Status Tones */
  --color-accent-gold: #f59e0b;
  --color-accent-amber: #d97706;
  --color-success: #10b981;
  --color-success-bg: #ecfdf5;

  /* Neutral Light Palette */
  --color-bg: #f9fafb;
  --color-surface: #ffffff;
  --color-surface-alt: #f3f4f6;
  --color-surface-hover: #f8fafc;
  --color-border: #e5e7eb;
  --color-border-hover: #d1d5db;

  /* Typography */
  --color-text-main: #111827;              /* Deep charcoal */
  --color-text-muted: #4b5563;             /* Neutral grey */
  --color-text-light: #6b7280;             /* Subdued slate */
  --color-text-inverse: #ffffff;

  /* Fonts */
  --font-heading: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;

  /* Elevation Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(17, 24, 39, 0.07), 0 2px 4px -2px rgba(17, 24, 39, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(17, 24, 39, 0.08), 0 4px 6px -4px rgba(17, 24, 39, 0.03);
  --shadow-xl: 0 20px 25px -5px rgba(17, 24, 39, 0.1), 0 8px 10px -6px rgba(17, 24, 39, 0.04);
  --shadow-brand: 0 10px 20px -3px rgba(229, 97, 37, 0.3);

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 350ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Accessibility: Skip Link */
.skip-to-content {
  position: absolute;
  top: -100px;
  left: 20px;
  background: var(--color-brand-primary);
  color: #ffffff;
  padding: 12px 20px;
  font-weight: 700;
  border-radius: var(--radius-md);
  z-index: 9999;
  transition: top var(--transition-fast);
  box-shadow: var(--shadow-xl);
}

.skip-to-content:focus {
  top: 20px;
  outline: 3px solid #ffffff;
}

/* Focus Visible High-Contrast Accessibility */
:focus-visible {
  outline: 3px solid var(--color-brand-primary);
  outline-offset: 3px;
}

/* Base Reset & Core Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  color: var(--color-text-main);
  background-color: var(--color-bg);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1240px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.section {
  padding-top: 96px;
  padding-bottom: 96px;
  position: relative;
}

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

.section-dark {
  background-color: var(--color-dark-bg);
  color: var(--color-text-inverse);
}

/* Section Header Component */
.section-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 56px auto;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background-color: var(--color-brand-light);
  color: var(--color-brand-primary);
  border: 1px solid var(--color-brand-light-border);
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}

.section-badge.dark {
  background-color: rgba(229, 97, 37, 0.15);
  color: #fb923c;
  border-color: rgba(229, 97, 37, 0.35);
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--color-text-main);
  margin-bottom: 16px;
}

.section-dark .section-title {
  color: var(--color-text-inverse);
}

.section-description {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.section-dark .section-description {
  color: #9ca3af;
}

/* ==========================================================================
   TOP NOTIFICATION & UTILITY BAR
   ========================================================================== */
.top-bar {
  background-color: var(--color-dark-bg);
  color: #9ca3af;
  font-size: 0.8125rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  position: relative;
  z-index: 101;
}

.top-bar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 8px;
  padding-bottom: 8px;
  gap: 16px;
}

.top-bar-left, .top-bar-right {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.top-bar-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color var(--transition-fast);
}

.top-bar-item:hover {
  color: #ffffff;
}

.top-bar-item svg {
  width: 14px;
  height: 14px;
  stroke-width: 2;
  color: var(--color-brand-primary);
  flex-shrink: 0;
}

.live-office-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 10px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.75rem;
  background: rgba(255, 255, 255, 0.08);
  color: #e5e7eb;
}

.live-status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: #22c55e;
  box-shadow: 0 0 8px #22c55e;
  display: inline-block;
  animation: pulse-green 2s infinite;
}

@keyframes pulse-green {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.7); }
  70% { transform: scale(1.1); box-shadow: 0 0 0 6px rgba(34, 197, 94, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(34, 197, 94, 0); }
}

.flag-icon {
  width: 18px;
  height: 12px;
  border-radius: 2px;
  object-fit: cover;
  box-shadow: 0 0 1px rgba(0,0,0,0.5);
}

/* ==========================================================================
   STICKY NAVBAR
   ========================================================================== */
.navbar-sticky {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
  transition: all var(--transition-normal);
}

.navbar-sticky.scrolled {
  box-shadow: var(--shadow-md);
  background: rgba(255, 255, 255, 0.99);
}

.navbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 78px;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-logo-img {
  height: 48px;
  width: auto;
  object-fit: contain;
}

.brand-info {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--color-text-main);
  line-height: 1.2;
}

.brand-tagline {
  font-size: 0.725rem;
  color: var(--color-text-light);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  position: relative;
  padding: 6px 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--color-brand-primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background-color: var(--color-brand-primary);
  transition: width var(--transition-fast);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Button Component */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-weight: 700;
  font-size: 0.9375rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.98);
}

.btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.btn-primary {
  background-color: var(--color-brand-primary);
  color: #ffffff;
  box-shadow: 0 2px 4px rgba(229, 97, 37, 0.25);
}

.btn-primary:hover {
  background-color: var(--color-brand-primary-hover);
  box-shadow: 0 4px 14px rgba(229, 97, 37, 0.38);
  transform: translateY(-1px);
  color: #ffffff;
}

.btn-outline {
  background-color: transparent;
  border-color: var(--color-border);
  color: var(--color-text-main);
}

.btn-outline:hover {
  background-color: var(--color-surface-alt);
  border-color: var(--color-brand-primary);
  color: var(--color-brand-primary);
}

.btn-outline-brand {
  background-color: transparent;
  border-color: var(--color-brand-primary);
  color: var(--color-brand-primary);
}

.btn-outline-brand:hover {
  background-color: var(--color-brand-light);
  color: var(--color-brand-primary-dark);
}

.btn-outline-white {
  background-color: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.25);
  color: #ffffff;
}

.btn-outline-white:hover {
  background-color: rgba(255, 255, 255, 0.16);
  border-color: #ffffff;
  color: #ffffff;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1.0625rem;
  border-radius: var(--radius-lg);
}

/* Mobile Toggle */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--color-text-main);
}

.mobile-toggle svg {
  width: 26px;
  height: 26px;
}

/* Mobile Drawer */
.mobile-drawer {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  width: 100%;
  height: calc(100dvh - 64px);
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--color-border);
  box-shadow: var(--shadow-xl);
  padding: 20px 24px 32px;
  z-index: 99;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.mobile-drawer.open {
  display: block;
}

.mobile-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.mobile-nav-link {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text-main);
  display: block;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-surface-alt);
}

.mobile-nav-link:hover {
  color: var(--color-brand-primary);
}

.mobile-drawer-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
}

.mobile-drawer-cta {
  width: 100%;
  justify-content: center;
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero {
  position: relative;
  background-color: var(--color-dark-bg);
  background-image: 
    radial-gradient(at 10% 20%, rgba(229, 97, 37, 0.22) 0px, transparent 45%),
    radial-gradient(at 90% 80%, rgba(245, 158, 11, 0.12) 0px, transparent 45%),
    linear-gradient(rgba(9, 14, 23, 0.88), rgba(9, 14, 23, 0.94)),
    url('../images/header_bg_opt.jpg');
  background-size: cover;
  background-position: center;
  color: #ffffff;
  padding-top: 100px;
  padding-bottom: 120px;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 48px;
  align-items: center;
}

.hero-badge-wrap {
  margin-bottom: 24px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: rgba(229, 97, 37, 0.15);
  border: 1px solid rgba(229, 97, 37, 0.35);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  color: #fed7aa;
  backdrop-filter: blur(8px);
}

.hero-badge .pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-brand-primary);
  box-shadow: 0 0 10px var(--color-brand-primary);
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: #ffffff;
  margin-bottom: 20px;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #fb923c 0%, #e56125 50%, #fcd34d 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.1875rem;
  line-height: 1.7;
  color: #cbd5e1;
  margin-bottom: 36px;
  max-width: 600px;
}

.hero-cta-group {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-guarantees {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  font-size: 0.875rem;
  color: #9ca3af;
}

.hero-guarantee-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.hero-guarantee-item svg {
  width: 16px;
  height: 16px;
  color: var(--color-brand-primary);
  flex-shrink: 0;
}

/* Hero Right: Consultation Card */
.hero-card {
  background: rgba(17, 24, 39, 0.85);
  border: 1px solid rgba(229, 97, 37, 0.25);
  border-radius: var(--radius-xl);
  padding: 32px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-xl);
  position: relative;
}

.hero-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-brand-primary), var(--color-accent-gold));
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.hero-card-header {
  margin-bottom: 24px;
}

.hero-card-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 6px;
}

.hero-card-desc {
  font-size: 0.875rem;
  color: #9ca3af;
}

.hero-quick-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 24px;
}

.hero-quick-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.9375rem;
  color: #e5e7eb;
}

.hero-quick-item svg {
  width: 20px;
  height: 20px;
  color: var(--color-brand-primary);
  flex-shrink: 0;
  margin-top: 2px;
}

.hero-card-cta {
  width: 100%;
}

/* ==========================================================================
   METRICS STRIP (ELEVATED CARDS)
   ========================================================================== */
.metrics-strip {
  margin-top: -60px;
  position: relative;
  z-index: 10;
  margin-bottom: 40px;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.metric-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  text-align: center;
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  border-top: 3px solid transparent;
}

.metric-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-top-color: var(--color-brand-primary);
}

.metric-number {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-brand-primary);
  line-height: 1;
  margin-bottom: 8px;
}

.metric-label {
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-text-main);
  margin-bottom: 4px;
}

.metric-sub {
  font-size: 0.8125rem;
  color: var(--color-text-light);
}

/* ==========================================================================
   ABOUT & CAPABILITIES SECTION
   ========================================================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
}

.about-lead {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text-main);
  line-height: 1.6;
  margin-bottom: 20px;
}

.about-text {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: 28px;
}

.about-features-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 36px;
}

.about-feature-box {
  background: var(--color-surface-alt);
  border-radius: var(--radius-md);
  padding: 16px;
  border-left: 3px solid var(--color-brand-primary);
}

.about-feature-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--color-text-main);
  margin-bottom: 4px;
}

.about-feature-desc {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  line-height: 1.5;
}

/* Chemical Lab Visual Card */
.lab-card {
  background: linear-gradient(135deg, #090e17 0%, #162032 100%);
  border: 1px solid rgba(229, 97, 37, 0.2);
  border-radius: var(--radius-xl);
  padding: 36px;
  color: #ffffff;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.lab-card::after {
  content: '';
  position: absolute;
  top: -50px;
  right: -50px;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(229, 97, 37, 0.25) 0%, transparent 70%);
  pointer-events: none;
}

.lab-badge {
  display: inline-block;
  background: rgba(229, 97, 37, 0.2);
  border: 1px solid rgba(229, 97, 37, 0.4);
  color: #fdba74;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.lab-card-title {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 16px;
  color: #ffffff;
}

.lab-card-desc {
  color: #cbd5e1;
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-bottom: 24px;
}

.lab-metrics-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.lab-metric-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.875rem;
}

.lab-metric-label {
  color: #9ca3af;
}

.lab-metric-val {
  font-weight: 700;
  color: #fed7aa;
}

/* ==========================================================================
   PRODUCTS & APPLICATIONS SHOWCASE + INSTANT SEARCH
   ========================================================================== */
.product-controls-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  margin-bottom: 48px;
}

.product-search-box {
  width: 100%;
  max-width: 480px;
  position: relative;
}

.product-search-input {
  width: 100%;
  padding: 14px 20px 14px 46px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-main);
  font-size: 0.9375rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.product-search-input:focus {
  border-color: var(--color-brand-primary);
  box-shadow: 0 0 0 3px rgba(229, 97, 37, 0.15);
}

.product-search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--color-text-light);
  pointer-events: none;
}

.filter-tabs-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.tab-btn {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 10px 20px;
  border-radius: var(--radius-full);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  background: var(--color-brand-light);
  color: var(--color-brand-primary);
  border-color: var(--color-brand-light-border);
}

.tab-btn.active {
  background: var(--color-brand-primary);
  color: #ffffff;
  border-color: var(--color-brand-primary);
  box-shadow: 0 4px 12px rgba(229, 97, 37, 0.35);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.product-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-brand-light-border);
}

.product-card-spec-badge {
  position: absolute;
  top: 18px;
  right: 18px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-brand-primary);
  background: var(--color-brand-light);
  border: 1px solid var(--color-brand-light-border);
  padding: 4px 8px;
  border-radius: var(--radius-full);
  transition: opacity var(--transition-fast);
}

.product-icon-wrap {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-brand-light);
  color: var(--color-brand-primary);
  margin-bottom: 20px;
  border: 1px solid var(--color-brand-light-border);
}

.product-icon-wrap svg {
  width: 28px;
  height: 28px;
}

.product-card-category {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-brand-primary);
  margin-bottom: 6px;
}

.product-card-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-text-main);
  line-height: 1.3;
  margin-bottom: 12px;
}

.product-card-desc {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
}

.product-tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.product-tag {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  background-color: var(--color-surface-alt);
  color: var(--color-text-muted);
  border-radius: var(--radius-full);
}

.product-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 0;
  margin-top: auto;
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
}

.product-feature-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.product-feature-item svg {
  width: 14px;
  height: 14px;
  color: var(--color-brand-primary);
  flex-shrink: 0;
}

.no-products-found {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  display: none;
}

.no-products-found h3 {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

/* ==========================================================================
   TECHNICAL SPECIFICATIONS MODAL
   ========================================================================== */
.spec-modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(9, 14, 23, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.spec-modal-backdrop.open {
  display: flex;
  opacity: 1;
}

.spec-modal {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  max-width: 640px;
  width: 100%;
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  position: relative;
  transform: translateY(20px);
  transition: transform var(--transition-normal);
}

.spec-modal-backdrop.open .spec-modal {
  transform: translateY(0);
}

.spec-modal-header {
  padding: 24px 28px;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  background-color: var(--color-surface-alt);
}

.spec-modal-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-text-main);
  margin-bottom: 4px;
}

.spec-modal-category {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-brand-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.spec-modal-close {
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  color: var(--color-text-light);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.spec-modal-close:hover {
  background-color: #e5e7eb;
  color: var(--color-text-main);
}

.spec-modal-body {
  padding: 28px;
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
  margin-bottom: 24px;
}

.spec-table tr {
  border-bottom: 1px solid var(--color-border);
}

.spec-table th {
  text-align: left;
  padding: 10px 0;
  color: var(--color-text-light);
  font-weight: 600;
  width: 40%;
}

.spec-table td {
  padding: 10px 0;
  color: var(--color-text-main);
  font-weight: 700;
}

.spec-modal-actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  flex-wrap: wrap;
}

/* ==========================================================================
   SUBSTRATE COMPATIBILITY MATRIX
   ========================================================================== */
.matrix-container {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  margin-top: 48px;
}

.matrix-table {
  width: 100%;
  border-collapse: collapse;
  text-align: center;
  font-size: 0.875rem;
}

.matrix-table th, .matrix-table td {
  padding: 14px 16px;
  border: 1px solid var(--color-border);
}

.matrix-table th {
  background: var(--color-surface-alt);
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--color-text-main);
}

.matrix-table td:first-child {
  text-align: left;
  font-weight: 700;
  color: var(--color-text-main);
  background: var(--color-surface);
}

.matrix-badge-optimal {
  display: inline-block;
  background: #dcfce7;
  color: #15803d;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
}

.matrix-badge-compatible {
  display: inline-block;
  background: #fef3c7;
  color: #b45309;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
}

/* ==========================================================================
   WHY CHOOSE SATURN / VALUE PILLARS
   ========================================================================== */
.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.why-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: all var(--transition-fast);
}

.why-card:hover {
  background: rgba(229, 97, 37, 0.08);
  border-color: rgba(229, 97, 37, 0.35);
  transform: translateY(-4px);
}

.why-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(229, 97, 37, 0.15);
  color: #fb923c;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  border: 1px solid rgba(229, 97, 37, 0.3);
}

.why-icon svg {
  width: 26px;
  height: 26px;
}

.why-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
}

.why-desc {
  font-size: 0.9375rem;
  color: #9ca3af;
  line-height: 1.7;
}

/* ==========================================================================
   FAQ ACCORDION
   ========================================================================== */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.faq-item.active {
  border-color: var(--color-brand-light-border);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-heading);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-text-main);
  gap: 16px;
}

.faq-question:hover {
  color: var(--color-brand-primary);
}

.faq-question svg {
  width: 20px;
  height: 20px;
  color: var(--color-text-light);
  transition: transform var(--transition-normal);
  flex-shrink: 0;
}

.faq-item.active .faq-question svg {
  transform: rotate(180deg);
  color: var(--color-brand-primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal) ease-out;
  padding: 0 24px;
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 400px;
  padding-bottom: 24px;
}

/* ==========================================================================
   CONTACT & LOCATION SECTION
   ========================================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.contact-info-cards {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  align-items: flex-start;
  gap: 20px;
  transition: all var(--transition-fast);
}

.contact-card:hover {
  border-color: var(--color-brand-light-border);
  box-shadow: var(--shadow-md);
}

.contact-card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--color-brand-light);
  color: var(--color-brand-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border: 1px solid var(--color-brand-light-border);
}

.contact-card-icon svg {
  width: 24px;
  height: 24px;
}

.contact-card-body {
  flex: 1;
}

.contact-card-title {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-brand-primary);
  margin-bottom: 4px;
}

.contact-card-value {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text-main);
  line-height: 1.4;
  margin-bottom: 8px;
}

.contact-card-sub {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.contact-copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-brand-primary);
  background: none;
  border: none;
  cursor: pointer;
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  background-color: var(--color-brand-light);
  border: 1px solid var(--color-brand-light-border);
  margin-top: 6px;
  transition: all var(--transition-fast);
}

.contact-copy-btn:hover {
  background-color: #ffedd5;
  color: var(--color-brand-primary-dark);
}

.map-container {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  min-height: 420px;
}

.map-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--color-surface-alt);
}

.map-header-title {
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-text-main);
}

.map-frame-wrap {
  flex: 1;
  width: 100%;
  height: 100%;
  min-height: 360px;
  position: relative;
}

.map-frame-wrap iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.footer {
  background-color: #060910;
  color: #9ca3af;
  padding-top: 80px;
  padding-bottom: 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-top-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 48px;
  margin-bottom: 60px;
}

.footer-logo-lockup {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.footer-logo-img {
  height: 42px;
  width: 42px;
  display: block;
  flex-shrink: 0;
}

.footer-brand-name {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 800;
  color: #ffffff;
}

.footer-desc {
  font-size: 0.875rem;
  line-height: 1.7;
  color: #9ca3af;
  margin-bottom: 24px;
}

.footer-col-title {
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #ffffff;
  margin-bottom: 20px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-link {
  font-size: 0.875rem;
  color: #9ca3af;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-brand-primary);
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.8125rem;
}

.footer-bottom a {
  color: #cbd5e1;
}

.footer-bottom a:hover {
  color: #ffffff;
}

/* Toast Notification with Progress Bar */
.toast-notice {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background-color: var(--color-dark-surface);
  color: #ffffff;
  padding: 14px 22px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  font-size: 0.875rem;
  font-weight: 600;
  z-index: 999;
  transform: translateY(100px);
  opacity: 0;
  transition: all var(--transition-bounce);
  display: flex;
  align-items: center;
  gap: 12px;
  border: 1px solid rgba(229, 97, 37, 0.4);
}

.toast-notice.show {
  transform: translateY(0);
  opacity: 1;
}

.toast-icon {
  width: 18px;
  height: 18px;
  color: #22c55e;
  flex-shrink: 0;
}

/* Floating Action Dock (Quick Contact) */
.floating-dock {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(17, 24, 39, 0.92);
  border: 1px solid rgba(229, 97, 37, 0.35);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 6px 10px;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-xl);
  z-index: 95;
  transition: all var(--transition-fast);
}

.floating-dock-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 700;
  color: #ffffff;
  transition: all var(--transition-fast);
}

.floating-dock-item:hover {
  background-color: var(--color-brand-primary);
  color: #ffffff;
}

.floating-dock-item svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 24px;
  left: 24px;
  width: 44px;
  height: 44px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-main);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  z-index: 90;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background-color: var(--color-brand-primary);
  color: #ffffff;
  border-color: var(--color-brand-primary);
  transform: translateY(-2px);
}

/* ==========================================================================
   RESPONSIVE DESIGN BREAKPOINTS
   ========================================================================== */

/* --- Tablet landscape / small desktop (≤ 1024px) --- */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

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

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

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

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

  .footer-top-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 36px;
  }
}

/* --- Tablet portrait / large phone (≤ 768px) --- */
@media (max-width: 768px) {
  /* --- Global layout --- */
  .container {
    padding-left: 18px;
    padding-right: 18px;
  }

  .section {
    padding-top: 56px;
    padding-bottom: 56px;
  }

  .section-header {
    margin-bottom: 36px;
  }

  .section-title {
    font-size: 1.65rem;
  }

  .section-description {
    font-size: 1rem;
  }

  /* --- Top bar hide --- */
  .top-bar {
    display: none;
  }

  /* --- Navbar --- */
  .navbar-container {
    height: 64px;
  }

  .brand-logo-img {
    height: 38px;
  }

  .brand-link {
    gap: 10px;
  }

  .brand-name {
    font-size: 1rem;
  }

  .brand-tagline {
    font-size: 0.65rem;
  }

  .nav-menu, .nav-actions .btn-quote {
    display: none;
  }

  .mobile-toggle {
    display: block;
  }

  /* --- Mobile drawer (full-screen overlay) --- */
  .mobile-drawer {
    top: 64px;
    padding: 20px 18px 28px;
    max-height: calc(100dvh - 64px);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    animation: mobileDrawerSlide 0.25s ease-out;
  }

  @keyframes mobileDrawerSlide {
    from { opacity: 0; transform: translateY(-12px); }
    to   { opacity: 1; transform: translateY(0); }
  }

  .mobile-nav-list {
    gap: 4px;
  }

  .mobile-nav-link {
    font-size: 1rem;
    padding: 14px 16px;
    border-bottom: 1px solid var(--color-surface-alt);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
  }

  .mobile-nav-link:active {
    background-color: var(--color-brand-light);
    color: var(--color-brand-primary);
  }

  /* --- Hero --- */
  .hero {
    padding-top: 48px;
    padding-bottom: 64px;
  }

  .hero-badge {
    font-size: 0.75rem;
    padding: 6px 14px;
  }

  .hero-badge-wrap {
    margin-bottom: 16px;
  }

  .hero-title {
    font-size: clamp(1.75rem, 7vw, 2.25rem);
    margin-bottom: 14px;
  }

  .hero-subtitle {
    font-size: 1rem;
    margin-bottom: 24px;
    line-height: 1.65;
  }

  .hero-cta-group {
    flex-direction: column;
    gap: 12px;
    margin-bottom: 28px;
  }

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

  .hero-guarantees {
    gap: 12px 20px;
    font-size: 0.8125rem;
  }

  /* Hero consultation card */
  .hero-card {
    padding: 24px 20px;
    border-radius: var(--radius-lg);
  }

  .hero-card-title {
    font-size: 1.15rem;
  }

  .hero-quick-item {
    font-size: 0.875rem;
    gap: 10px;
  }

  .hero-quick-item svg {
    width: 18px;
    height: 18px;
  }

  /* --- Metrics strip --- */
  .metrics-strip {
    margin-top: -30px;
  }

  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .metric-card {
    padding: 20px 16px;
    border-radius: var(--radius-md);
  }

  .metric-card:hover {
    transform: none;
  }

  .metric-number {
    font-size: 1.85rem;
  }

  .metric-label {
    font-size: 0.875rem;
  }

  .metric-sub {
    font-size: 0.75rem;
  }

  /* --- About section --- */
  .about-lead {
    font-size: 1.1rem;
  }

  .about-text {
    font-size: 0.9375rem;
  }

  .about-features-grid {
    grid-template-columns: 1fr;
    gap: 12px;
    margin-bottom: 28px;
  }

  .about-feature-box {
    padding: 14px 16px;
  }

  /* Lab card */
  .lab-card {
    padding: 24px 20px;
    border-radius: var(--radius-lg);
  }

  .lab-card-title {
    font-size: 1.25rem;
  }

  .lab-card-desc {
    font-size: 0.875rem;
  }

  .lab-metric-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding-bottom: 14px;
  }

  .lab-metric-val {
    font-size: 0.8125rem;
  }

  /* --- Products section --- */
  .product-controls-wrapper {
    gap: 16px;
    margin-bottom: 32px;
  }

  .product-search-input {
    padding: 12px 16px 12px 42px;
    font-size: 0.875rem;
  }

  .filter-tabs-wrapper {
    gap: 8px;
    justify-content: flex-start;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    flex-wrap: nowrap;
    padding-bottom: 4px;
    scrollbar-width: none;
    -ms-overflow-style: none;
    width: 100%;
  }

  .filter-tabs-wrapper::-webkit-scrollbar {
    display: none;
  }

  .tab-btn {
    padding: 8px 16px;
    font-size: 0.8125rem;
    white-space: nowrap;
    flex-shrink: 0;
  }

  .products-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .product-card {
    padding: 24px 20px;
    border-radius: var(--radius-md);
  }

  .product-card:hover {
    transform: none;
    box-shadow: var(--shadow-md);
  }

  .product-card:active {
    transform: scale(0.985);
    background-color: var(--color-surface-alt);
  }

  .product-icon-wrap {
    width: 48px;
    height: 48px;
    margin-bottom: 16px;
  }

  .product-icon-wrap svg {
    width: 24px;
    height: 24px;
  }

  .product-card-title {
    font-size: 1.15rem;
  }

  .product-card-desc {
    font-size: 0.875rem;
    margin-bottom: 16px;
  }

  .product-tags-list {
    gap: 6px;
    margin-bottom: 16px;
  }

  .product-tag {
    font-size: 0.6875rem;
    padding: 3px 8px;
  }

  .product-features-list {
    gap: 6px;
    padding-top: 12px;
  }

  .product-feature-item {
    font-size: 0.75rem;
    gap: 6px;
  }

  .product-card-spec-badge {
    top: 14px;
    right: 14px;
    font-size: 0.6875rem;
    padding: 3px 7px;
  }

  /* Substrate matrix scrollable on mobile */
  .matrix-container {
    margin-top: 32px;
    border-radius: var(--radius-md);
    -webkit-overflow-scrolling: touch;
  }

  .matrix-table th,
  .matrix-table td {
    padding: 10px 12px;
    font-size: 0.75rem;
    white-space: nowrap;
  }

  .matrix-badge-optimal,
  .matrix-badge-compatible {
    font-size: 0.6875rem;
    padding: 2px 6px;
  }

  /* --- Why Choose Us --- */
  .why-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .why-card {
    padding: 24px 20px;
    border-radius: var(--radius-md);
  }

  .why-card:hover {
    transform: none;
  }

  .why-card:active {
    background: rgba(229, 97, 37, 0.06);
    border-color: rgba(229, 97, 37, 0.25);
  }

  .why-icon {
    width: 44px;
    height: 44px;
    margin-bottom: 14px;
  }

  .why-icon svg {
    width: 22px;
    height: 22px;
  }

  .why-title {
    font-size: 1.1rem;
    margin-bottom: 8px;
  }

  .why-desc {
    font-size: 0.875rem;
  }

  /* --- FAQ --- */
  .faq-list {
    gap: 12px;
  }

  .faq-question {
    padding: 16px 18px;
    font-size: 0.9375rem;
    gap: 12px;
  }

  .faq-answer {
    padding-left: 18px;
    padding-right: 18px;
    font-size: 0.875rem;
  }

  .faq-item.active .faq-answer {
    padding-bottom: 18px;
  }

  /* --- Contact section --- */
  .contact-grid {
    gap: 24px;
  }

  .contact-card {
    padding: 20px 16px;
    gap: 14px;
    border-radius: var(--radius-md);
  }

  .contact-card-icon {
    width: 42px;
    height: 42px;
  }

  .contact-card-icon svg {
    width: 20px;
    height: 20px;
  }

  .contact-card-value {
    font-size: 1rem;
    word-break: break-word;
  }

  .contact-card-sub {
    font-size: 0.75rem;
  }

  .contact-copy-btn {
    font-size: 0.6875rem;
    padding: 4px 8px;
  }

  .map-container {
    min-height: 320px;
    border-radius: var(--radius-md);
  }

  .map-header {
    padding: 12px 16px;
    flex-direction: column;
    gap: 10px;
    align-items: flex-start;
  }

  .map-header-title {
    font-size: 0.875rem;
  }

  .map-frame-wrap {
    min-height: 280px;
  }

  /* --- Technical spec modal --- */
  .spec-modal-backdrop {
    padding: 12px;
    align-items: flex-end;
  }

  .spec-modal {
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    max-height: 88dvh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .spec-modal-backdrop.open .spec-modal {
    transform: translateY(0);
    animation: modalSlideUp 0.3s ease-out;
  }

  @keyframes modalSlideUp {
    from { transform: translateY(100%); }
    to   { transform: translateY(0); }
  }

  .spec-modal-header {
    padding: 18px 20px;
    position: sticky;
    top: 0;
    z-index: 2;
    background-color: var(--color-surface-alt);
  }

  .spec-modal-title {
    font-size: 1.15rem;
  }

  .spec-modal-body {
    padding: 20px;
  }

  .spec-table {
    font-size: 0.875rem;
  }

  .spec-table th {
    width: 45%;
    font-size: 0.8125rem;
  }

  .spec-table td {
    font-size: 0.875rem;
  }

  .spec-modal-actions {
    flex-direction: column;
  }

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

  /* --- Footer --- */
  .footer {
    padding-top: 48px;
    padding-bottom: 28px;
  }

  .footer-top-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    margin-bottom: 36px;
  }

  .footer-logo-img {
    height: 36px;
    width: 36px;
  }

  .footer-brand-name {
    font-size: 1rem;
  }

  .footer-desc {
    font-size: 0.8125rem;
  }

  .footer-col-title {
    font-size: 0.875rem;
    margin-bottom: 14px;
  }

  .footer-links {
    gap: 10px;
  }

  .footer-link {
    font-size: 0.8125rem;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding-top: 20px;
    font-size: 0.75rem;
  }

  /* --- Floating dock & back-to-top --- */
  .floating-dock {
    bottom: 16px;
    right: 16px;
    padding: 5px 8px;
    gap: 4px;
    border-radius: var(--radius-lg);
  }

  .floating-dock-text {
    display: none;
  }

  .floating-dock-item {
    padding: 10px;
    border-radius: var(--radius-md);
  }

  .floating-dock-item svg {
    width: 18px;
    height: 18px;
  }

  .back-to-top {
    bottom: 16px;
    left: 16px;
    width: 40px;
    height: 40px;
  }

  /* --- Toast notification --- */
  .toast-notice {
    bottom: 72px;
    right: 16px;
    left: 16px;
    font-size: 0.8125rem;
    padding: 12px 16px;
    border-radius: var(--radius-md);
  }

  /* --- Buttons on mobile --- */
  .btn-lg {
    padding: 13px 24px;
    font-size: 1rem;
  }

  .btn-sm {
    padding: 8px 14px;
    font-size: 0.8125rem;
  }
}

/* --- Small phones (≤ 420px) — extra tight refinements --- */
@media (max-width: 420px) {
  .container {
    padding-left: 14px;
    padding-right: 14px;
  }

  .section {
    padding-top: 44px;
    padding-bottom: 44px;
  }

  .section-title {
    font-size: 1.45rem;
  }

  .hero {
    padding-top: 36px;
    padding-bottom: 52px;
  }

  .hero-title {
    font-size: 1.6rem;
  }

  .hero-subtitle {
    font-size: 0.9375rem;
  }

  .hero-badge {
    font-size: 0.6875rem;
    padding: 5px 12px;
  }

  .hero-card {
    padding: 20px 16px;
  }

  .hero-card-title {
    font-size: 1.05rem;
  }

  .hero-quick-item {
    font-size: 0.8125rem;
  }

  .hero-guarantees {
    flex-direction: column;
    gap: 8px;
  }

  .metrics-grid {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .metric-card {
    padding: 16px 12px;
  }

  .metric-number {
    font-size: 1.5rem;
  }

  .metric-label {
    font-size: 0.8125rem;
  }

  .metric-sub {
    font-size: 0.6875rem;
    display: none;
  }

  .lab-metric-row {
    font-size: 0.8125rem;
  }

  .product-card {
    padding: 20px 16px;
  }

  .product-card-title {
    font-size: 1.05rem;
  }

  .why-card {
    padding: 20px 16px;
  }

  .faq-question {
    padding: 14px 16px;
    font-size: 0.875rem;
  }

  .contact-card {
    flex-direction: column;
    gap: 12px;
  }

  .contact-card-icon {
    width: 40px;
    height: 40px;
  }

  .map-frame-wrap {
    min-height: 240px;
  }

  .spec-modal-backdrop {
    padding: 0;
  }

  .spec-modal {
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    max-height: 92dvh;
  }

  .spec-modal-header {
    padding: 16px;
  }

  .spec-modal-body {
    padding: 16px;
  }

  .spec-modal-title {
    font-size: 1.05rem;
  }

  .footer-bottom {
    font-size: 0.6875rem;
  }
}

/* --- Safe-area insets for notched phones --- */
@supports (padding: env(safe-area-inset-bottom)) {
  .floating-dock {
    bottom: calc(16px + env(safe-area-inset-bottom));
  }

  .back-to-top {
    bottom: calc(16px + env(safe-area-inset-bottom));
  }

  .toast-notice {
    bottom: calc(72px + env(safe-area-inset-bottom));
  }

  .spec-modal {
    padding-bottom: env(safe-area-inset-bottom);
  }

  .footer {
    padding-bottom: calc(28px + env(safe-area-inset-bottom));
  }
}

/* --- Touch device optimizations --- */
@media (hover: none) and (pointer: coarse) {
  /* Disable hover-based transforms to prevent sticky states */
  .product-card:hover,
  .metric-card:hover,
  .why-card:hover,
  .contact-card:hover {
    transform: none;
  }

  /* Slightly larger touch targets for interactive elements */
  .tab-btn {
    min-height: 44px;
  }

  .faq-question {
    min-height: 52px;
  }

  .contact-copy-btn {
    min-height: 36px;
  }

  .floating-dock-item {
    min-width: 44px;
    min-height: 44px;
  }

  .back-to-top {
    min-width: 44px;
    min-height: 44px;
  }

  /* Tap highlight for mobile Safari */
  .product-card,
  .why-card,
  .faq-question,
  .mobile-nav-link,
  .tab-btn {
    -webkit-tap-highlight-color: rgba(229, 97, 37, 0.12);
  }
}