/**
 * Qatar Piping - Premium B2B Industrial Piping CSS
 * Industrial Supply, Engineering, Fabrication, Installation & Testing
 * Optimized for PageSpeed 95+, WCAG AA/AAA Accessibility & Zero Framework Bloat
 */

:root {
  /* Brand Palette: Deep Industrial Slate, Steel Navy, Qatar Maroon Accent */
  --color-brand-primary: #0f172a;       /* Deep slate/navy */
  --color-brand-secondary: #1e293b;     /* Steel container navy */
  --color-brand-accent: #8a1538;        /* Qatar maroon */
  --color-brand-accent-hover: #6e102c;  /* Darker maroon */
  --color-safety-amber: #d97706;        /* Industrial safety amber */
  --color-safety-amber-light: #fef3c7;
  --color-tech-blue: #0284c7;           /* Technical link / highlight blue */
  --color-tech-blue-hover: #0369a1;
  
  /* Neutral Palette */
  --color-bg-page: #f8fafc;
  --color-bg-surface: #ffffff;
  --color-bg-muted: #f1f5f9;
  --color-bg-dark: #0f172a;
  --color-bg-dark-card: #1e293b;
  --color-border: #e2e8f0;
  --color-border-dark: #334155;
  --color-text-main: #1e293b;
  --color-text-muted: #64748b;
  --color-text-inverse: #f8fafc;
  --color-text-inverse-muted: #94a3b8;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  /* Spacing Scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Layout */
  --max-w-site: 1280px;
  --max-w-prose: 820px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

  --header-height: 80px;
  --topbar-height: 40px;
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-main);
  background-color: var(--color-bg-page);
  scroll-behavior: smooth;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

a:hover {
  color: var(--color-brand-accent-hover);
  text-decoration: underline;
}

ul, ol {
  list-style-position: inside;
}

/* Skip Navigation for Accessibility */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--color-brand-accent);
  color: #ffffff;
  padding: 0.75rem 1.25rem;
  font-weight: 700;
  z-index: 99999;
  border-radius: var(--radius-sm);
  transition: top var(--transition-fast);
}
.skip-link:focus {
  top: 1rem;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--max-w-site);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

.container-narrow {
  max-width: var(--max-w-prose);
}

/* Typography Utility */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-brand-primary);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2rem, 4vw + 1rem, 3.25rem); margin-bottom: var(--space-4); }
h2 { font-size: clamp(1.6rem, 2.5vw + 0.8rem, 2.25rem); margin-bottom: var(--space-4); }
h3 { font-size: clamp(1.25rem, 1.5vw + 0.5rem, 1.5rem); margin-bottom: var(--space-3); }
h4 { font-size: 1.15rem; margin-bottom: var(--space-2); }

p {
  margin-bottom: var(--space-4);
  color: var(--color-text-main);
}

.lead {
  font-size: 1.15rem;
  line-height: 1.6;
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}

.text-maroon { color: var(--color-brand-accent); }
.text-amber { color: var(--color-safety-amber); }
.text-muted { color: var(--color-text-muted); }
.text-inverse { color: var(--color-text-inverse); }
.text-center { text-align: center; }
.font-mono { font-family: var(--font-mono); }

/* Badges & Tags */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-sm);
  background-color: var(--color-bg-muted);
  color: var(--color-brand-secondary);
}
.badge-maroon {
  background-color: rgba(138, 21, 56, 0.1);
  color: var(--color-brand-accent);
}
.badge-amber {
  background-color: var(--color-safety-amber-light);
  color: #92400e;
}
.badge-blue {
  background-color: #e0f2fe;
  color: #0369a1;
}

/* Buttons & CTAs */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}
.btn:hover {
  text-decoration: none;
}
.btn-primary {
  background-color: var(--color-brand-accent);
  color: #ffffff;
  border-color: var(--color-brand-accent);
}
.btn-primary:hover {
  background-color: var(--color-brand-accent-hover);
  border-color: var(--color-brand-accent-hover);
  color: #ffffff;
}
.btn-secondary {
  background-color: var(--color-brand-secondary);
  color: #ffffff;
  border-color: var(--color-brand-secondary);
}
.btn-secondary:hover {
  background-color: #0f172a;
  border-color: #0f172a;
  color: #ffffff;
}
.btn-outline {
  background-color: transparent;
  color: var(--color-brand-primary);
  border-color: var(--color-border-dark);
}
.btn-outline:hover {
  background-color: var(--color-brand-primary);
  color: #ffffff;
}
.btn-outline-white {
  background-color: transparent;
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.4);
}
.btn-outline-white:hover {
  background-color: #ffffff;
  color: var(--color-brand-primary);
}
.btn-amber {
  background-color: var(--color-safety-amber);
  color: #ffffff;
  border-color: var(--color-safety-amber);
}
.btn-amber:hover {
  background-color: #b45309;
  border-color: #b45309;
  color: #ffffff;
}
.btn-lg {
  padding: 0.9rem 2rem;
  font-size: 1.05rem;
}
.btn-sm {
  padding: 0.45rem 0.9rem;
  font-size: 0.85rem;
}

/* Header & Navigation */
.site-topbar {
  background-color: #090d16;
  color: var(--color-text-inverse-muted);
  font-size: 0.82rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.topbar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.45rem var(--space-4);
  max-width: var(--max-w-site);
  margin: 0 auto;
}
.topbar-info {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.topbar-info span, .topbar-info a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--color-text-inverse-muted);
  text-decoration: none;
}
.topbar-info a:hover {
  color: #ffffff;
  text-decoration: underline;
}
.topbar-badge {
  background: rgba(138, 21, 56, 0.35);
  color: #fca5a5;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.75rem;
  border: 1px solid rgba(138, 21, 56, 0.5);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: #ffffff;
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 var(--space-4);
  max-width: var(--max-w-site);
  margin: 0 auto;
}
.logo-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}
.logo-icon {
  width: 44px;
  height: 44px;
}
.logo-text {
  display: flex;
  flex-direction: column;
}
.logo-brand {
  font-size: 1.35rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--color-brand-primary);
  line-height: 1;
}
.logo-brand span {
  color: var(--color-brand-accent);
}
.logo-tagline {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-top: 2px;
}

/* Desktop Nav */
.main-nav {
  display: none;
}
@media (min-width: 1024px) {
  .main-nav {
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }
}
.nav-list {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 0.25rem;
}
.nav-item {
  position: relative;
}
.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.5rem 0.75rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-brand-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  text-decoration: none;
}
.nav-link:hover, .nav-link:focus {
  color: var(--color-brand-accent);
  background-color: var(--color-bg-muted);
  text-decoration: none;
}
.nav-link.active {
  color: var(--color-brand-accent);
  font-weight: 700;
}

/* Mega Menu Dropdown */
.mega-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  width: min(920px, 92vw);
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  padding: 1.5rem;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: all var(--transition-normal);
  z-index: 1001;
}
.nav-item:hover .mega-menu,
.nav-item:focus-within .mega-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}
.mega-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.mega-col-title {
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-brand-accent);
  margin-bottom: 0.75rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--color-border);
}
.mega-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.mega-links a {
  display: block;
  font-size: 0.85rem;
  color: var(--color-brand-secondary);
  text-decoration: none;
  padding: 0.25rem 0.4rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}
.mega-links a:hover {
  background-color: var(--color-bg-muted);
  color: var(--color-brand-accent);
  text-decoration: none;
  padding-left: 0.6rem;
}

/* Mobile Nav Toggle */
.mobile-menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 42px;
  height: 42px;
  background: var(--color-bg-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 8px;
  gap: 5px;
}
@media (min-width: 1024px) {
  .mobile-menu-toggle {
    display: none;
  }
}
.mobile-menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-brand-primary);
  transition: all var(--transition-fast);
}

/* Mobile Nav Drawer */
.mobile-drawer {
  position: fixed;
  top: 0;
  right: -100%;
  width: 85%;
  max-width: 380px;
  height: 100vh;
  background: #ffffff;
  z-index: 10000;
  box-shadow: var(--shadow-xl);
  padding: 1.5rem;
  overflow-y: auto;
  transition: right var(--transition-normal);
  display: flex;
  flex-direction: column;
}
.mobile-drawer.open {
  right: 0;
}
.drawer-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(15, 23, 42, 0.6);
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}
.drawer-backdrop.open {
  opacity: 1;
  visibility: visible;
}
.drawer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 1rem;
}
.drawer-close {
  background: none;
  border: none;
  font-size: 1.75rem;
  line-height: 1;
  cursor: pointer;
  color: var(--color-text-muted);
}
.mobile-nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.mobile-nav-links a {
  display: block;
  padding: 0.65rem 0.5rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-brand-primary);
  border-bottom: 1px solid var(--color-bg-muted);
}
.mobile-nav-links a:hover {
  color: var(--color-brand-accent);
  text-decoration: none;
}

/* Section Shells */
.section {
  padding-top: var(--space-16);
  padding-bottom: var(--space-16);
  position: relative;
}
.section-sm {
  padding-top: var(--space-10);
  padding-bottom: var(--space-10);
}
.section-dark {
  background-color: var(--color-bg-dark);
  color: var(--color-text-inverse);
}
.section-dark h1, .section-dark h2, .section-dark h3, .section-dark h4 {
  color: var(--color-text-inverse);
}
.section-dark p {
  color: var(--color-text-inverse-muted);
}
.section-muted {
  background-color: var(--color-bg-muted);
}

.section-header {
  margin-bottom: var(--space-10);
}
.section-header.text-center {
  max-width: var(--max-w-prose);
  margin-left: auto;
  margin-right: auto;
}
.section-title {
  margin-bottom: var(--space-3);
}
.section-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-muted);
}

/* Hero Section */
.hero {
  position: relative;
  background: linear-gradient(135deg, #090d16 0%, #1e293b 100%);
  color: #ffffff;
  padding: var(--space-20) 0 var(--space-16);
  border-bottom: 4px solid var(--color-brand-accent);
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(138, 21, 56, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(138, 21, 56, 0.05) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 860px;
}
.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(138, 21, 56, 0.25);
  border: 1px solid rgba(138, 21, 56, 0.6);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: #fecdd3;
  margin-bottom: var(--space-4);
}
.hero-title {
  color: #ffffff;
  margin-bottom: var(--space-4);
  line-height: 1.15;
}
.hero-subtitle {
  font-size: 1.25rem;
  line-height: 1.6;
  color: #cbd5e1;
  margin-bottom: var(--space-8);
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: var(--space-8);
}

/* Trust / Capability Bar */
.trust-bar {
  background: #0f172a;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 1.25rem 0;
}
.trust-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}
@media (min-width: 768px) {
  .trust-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}
@media (min-width: 1024px) {
  .trust-grid {
    grid-template-columns: repeat(7, 1fr);
  }
}
.trust-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: #e2e8f0;
  font-size: 0.85rem;
  font-weight: 600;
}
.trust-item svg {
  flex-shrink: 0;
  color: var(--color-brand-accent);
}

/* Cards & Grids */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
@media (min-width: 768px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 1024px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.grid-4 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}
@media (min-width: 640px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

.card {
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: #cbd5e1;
}
.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background-color: rgba(138, 21, 56, 0.08);
  color: var(--color-brand-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}
.card-title {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}
.card-text {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  flex-grow: 1;
  margin-bottom: 1rem;
}
.card-link {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--color-brand-accent);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}
.card-link:hover {
  text-decoration: underline;
}

/* Material Badges & Grid */
.material-card {
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-brand-accent);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  transition: all var(--transition-fast);
}
.material-card:hover {
  border-color: var(--color-brand-accent);
  box-shadow: var(--shadow-md);
}

/* Engineering & Fabrication Process Timeline */
.process-stepper {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  position: relative;
}
.process-step {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 1.25rem;
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  align-items: start;
}
.step-num {
  width: 44px;
  height: 44px;
  background: var(--color-brand-secondary);
  color: #ffffff;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  font-family: var(--font-mono);
}
.step-content h3 {
  font-size: 1.15rem;
  margin-bottom: 0.35rem;
}
.step-content p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* Technical Specification Table */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: #ffffff;
  margin-bottom: var(--space-6);
}
.tech-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}
.tech-table th {
  background: var(--color-bg-muted);
  color: var(--color-brand-primary);
  font-weight: 700;
  padding: 0.85rem 1rem;
  border-bottom: 2px solid var(--color-border);
  white-space: nowrap;
}
.tech-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-main);
}
.tech-table tr:last-child td {
  border-bottom: none;
}
.tech-table tr:hover td {
  background-color: #f8fafc;
}

/* FAQ Accordion */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.faq-item {
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.faq-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 1.15rem 1.25rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-brand-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}
.faq-icon {
  width: 20px;
  height: 20px;
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}
.faq-item.active .faq-icon {
  transform: rotate(180deg);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal);
  padding: 0 1.25rem;
}
.faq-item.active .faq-answer {
  max-height: 500px;
  padding-bottom: 1.25rem;
}
.faq-answer p {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

/* Forms & RFQ Section */
.rfq-box {
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-top: 4px solid var(--color-brand-accent);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-lg);
}
.form-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}
@media (min-width: 768px) {
  .form-grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
  .form-grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.form-label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-brand-primary);
}
.form-label span {
  color: var(--color-brand-accent);
}
.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 0.75rem 0.9rem;
  font-size: 0.92rem;
  font-family: inherit;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: #ffffff;
  color: var(--color-text-main);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--color-brand-accent);
  box-shadow: 0 0 0 3px rgba(138, 21, 56, 0.15);
}
.form-help {
  font-size: 0.78rem;
  color: var(--color-text-muted);
}
.form-file-zone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: center;
  background: var(--color-bg-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.form-file-zone:hover {
  border-color: var(--color-brand-accent);
  background: #ffffff;
}

/* Honeypot anti-spam */
.hp-field {
  display: none !important;
  visibility: hidden !important;
}

/* Breadcrumbs */
.breadcrumb-nav {
  padding: 0.75rem 0;
  background: var(--color-bg-muted);
  border-bottom: 1px solid var(--color-border);
  font-size: 0.82rem;
}
.breadcrumb-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  list-style: none;
  gap: 0.4rem;
}
.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--color-text-muted);
}
.breadcrumb-item a {
  color: var(--color-text-muted);
  text-decoration: none;
}
.breadcrumb-item a:hover {
  color: var(--color-brand-accent);
  text-decoration: underline;
}
.breadcrumb-item.active {
  color: var(--color-brand-primary);
  font-weight: 600;
}

/* Article / Technical Guide Prose */
.article-prose {
  font-size: 1.05rem;
  line-height: 1.75;
  color: #334155;
}
.article-prose h2 {
  margin-top: 2.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-border);
}
.article-prose h3 {
  margin-top: 2rem;
}
.article-prose ul, .article-prose ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}
.article-prose li {
  margin-bottom: 0.5rem;
}
.article-callout {
  background-color: rgba(138, 21, 56, 0.04);
  border-left: 4px solid var(--color-brand-accent);
  padding: 1.25rem 1.5rem;
  margin: 1.75rem 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}
.article-callout-title {
  font-weight: 800;
  color: var(--color-brand-accent);
  margin-bottom: 0.35rem;
}

/* Internal Linking Cluster Grid */
.link-cluster {
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin-top: var(--space-12);
}
.link-cluster h3 {
  font-size: 1.15rem;
  margin-bottom: 1rem;
  color: var(--color-brand-primary);
}
.link-pill-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.link-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.85rem;
  background: var(--color-bg-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-brand-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
}
.link-pill:hover {
  background: var(--color-brand-accent);
  color: #ffffff;
  border-color: var(--color-brand-accent);
  text-decoration: none;
}

/* Footer */
.site-footer {
  background-color: #090d16;
  color: var(--color-text-inverse-muted);
  padding-top: var(--space-16);
  padding-bottom: var(--space-8);
  border-top: 4px solid var(--color-brand-accent);
  margin-top: auto;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  margin-bottom: var(--space-12);
}
@media (min-width: 640px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1fr 1.5fr;
  }
}
.footer-col-title {
  color: #ffffff;
  font-size: 0.95rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1.25rem;
}
.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.footer-links a {
  color: var(--color-text-inverse-muted);
  text-decoration: none;
  font-size: 0.88rem;
  transition: color var(--transition-fast);
}
.footer-links a:hover {
  color: #ffffff;
  text-decoration: underline;
}
.footer-bottom {
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  font-size: 0.82rem;
}
@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}
.footer-legal-links {
  display: flex;
  gap: 1.25rem;
  list-style: none;
}
.footer-legal-links a {
  color: var(--color-text-inverse-muted);
  text-decoration: none;
}
.footer-legal-links a:hover {
  color: #ffffff;
}

/* Sticky Mobile CTA Bar */
.mobile-sticky-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 60px;
  background: #0f172a;
  border-top: 2px solid var(--color-brand-accent);
  display: flex;
  align-items: stretch;
  z-index: 9998;
  box-shadow: 0 -4px 10px rgba(0, 0, 0, 0.2);
}
@media (min-width: 1024px) {
  .mobile-sticky-bar {
    display: none;
  }
}
.sticky-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  color: #ffffff;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-decoration: none;
  border-right: 1px solid rgba(255, 255, 255, 0.1);
  transition: background var(--transition-fast);
}
.sticky-btn:last-child {
  border-right: none;
}
.sticky-btn svg {
  width: 18px;
  height: 18px;
}
.sticky-btn-quote {
  background-color: var(--color-brand-accent);
}
.sticky-btn-quote:hover {
  background-color: var(--color-brand-accent-hover);
}
.sticky-btn-whatsapp {
  background-color: #128c7e;
}
.sticky-btn-whatsapp:hover {
  background-color: #075e54;
}

/* Modal for Quote / Fast RFQ */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(4px);
  z-index: 99999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}
.modal-overlay.open {
  opacity: 1;
  visibility: visible;
}
.modal-window {
  background: #ffffff;
  width: 100%;
  max-width: 680px;
  max-height: 90vh;
  overflow-y: auto;
  border-radius: var(--radius-md);
  padding: 2rem;
  position: relative;
  box-shadow: var(--shadow-xl);
}
.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-text-muted);
}

/* Floating WhatsApp Chat Widget */
.whatsapp-float-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9990;
  display: flex;
  align-items: center;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.whatsapp-float-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background-color: #25d366;
  color: #ffffff !important;
  padding: 8px 16px 8px 8px;
  border-radius: 9999px;
  box-shadow: 0 4px 16px rgba(37, 211, 102, 0.4), 0 2px 6px rgba(0, 0, 0, 0.15);
  text-decoration: none;
  font-family: var(--font-sans);
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.2s ease, background-color 0.2s ease;
  animation: whatsapp-pulse 2.8s infinite;
}

.whatsapp-float-btn:hover {
  background-color: #20ba5a;
  color: #ffffff !important;
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 6px 20px rgba(37, 211, 102, 0.55), 0 3px 8px rgba(0, 0, 0, 0.2);
  animation: none;
}

.whatsapp-float-btn:active {
  transform: translateY(0) scale(0.98);
}

.whatsapp-float-icon {
  width: 42px;
  height: 42px;
  background: #128c7e;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  position: relative;
}

.whatsapp-float-icon::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 10px;
  height: 10px;
  background-color: #4ade80;
  border: 2px solid #ffffff;
  border-radius: 50%;
}

.whatsapp-float-label {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  text-align: left;
}

.whatsapp-float-status {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: rgba(255, 255, 255, 0.95);
  font-weight: 600;
}

.whatsapp-float-label strong {
  font-size: 0.88rem;
  font-weight: 700;
  color: #ffffff;
}

@keyframes whatsapp-pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.6);
  }
  70% {
    box-shadow: 0 0 0 14px rgba(37, 211, 102, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(37, 211, 102, 0);
  }
}

/* On mobile / tablet screens when mobile sticky bar is active */
@media (max-width: 1023px) {
  .whatsapp-float-container {
    bottom: 72px; /* Positioned directly above mobile sticky action bar */
    right: 16px;
  }
  .whatsapp-float-label {
    display: none; /* Clean round floating button on mobile */
  }
  .whatsapp-float-btn {
    padding: 0;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    justify-content: center;
  }
  .whatsapp-float-icon {
    width: 50px;
    height: 50px;
    background: #25d366;
  }
}