/*
Theme Name: MPCVD Industrial
Theme URI: https://chinampcvd.com
Author: MPCVD Team
Author URI: https://chinampcvd.com
Description: Industrial-style B2B theme for MPCVD diamond heat spreader export business. Heavy-duty manufacturing aesthetic with blueprint grid, dimension lines, and metal nameplate elements.
Version: 1.0.0
License: GPL-2.0+
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: mpcvd-industrial
Domain Path: /languages
Tags: industrial, b2b, manufacturing, responsive, multilingual, woocommerce
Requires at least: 6.0
Tested up to: 6.5
Requires PHP: 8.0
*/

/* ============================================
   TABLE OF CONTENTS
   ============================================
   1. CSS Custom Properties (Industrial Color System)
   2. CSS Reset & Base Styles
   3. Typography (Oswald + JetBrains Mono + Inter)
   4. Layout & Grid System
   5. Components
      5.1 Buttons
      5.2 Cards
      5.3 Forms
      5.4 Tables
      5.5 Navigation
   6. Industrial Visual Elements
      6.1 Blueprint Grid
      6.2 Dimension Lines
      6.3 Hatch Patterns
      6.4 Metal Nameplate
      6.5 Safety Labels
   7. Page Templates
   8. WooCommerce Overrides
   9. Utilities
   10. Media Queries
   ============================================ */

/* ============================================
   1. CSS CUSTOM PROPERTIES
   ============================================ */
:root {
  /* Industrial Color Palette */
  --color-steel-blue: #2B3A4E;
  --color-steel-blue-dark: #1E2935;
  --color-copper: #B87333;
  --color-copper-dark: #9A5F28;
  --color-industrial-teal: #4A8082;
  --color-charcoal: #121212;
  --color-industrial-white: #F5F5F0;
  --color-blueprint-gray: #EAE8E3;
  --color-text-primary: #1E1E1E;
  --color-text-secondary: #5C5C5C;
  --color-success: #2E7D32;
  --color-warning: #E65100;
  --color-error: #C62828;
  --color-mechanical-gray: #4A4A4A;
  --color-brushed-silver: #C0C0C0;
  --color-anodized-blue: #1E3A5F;

  /* Industrial Shadows */
  --shadow-hard: 2px 2px 0 var(--color-steel-blue);
  --shadow-card: 2px 2px 0 var(--color-steel-blue);
  --shadow-inset-nameplate: inset 0 1px 3px rgba(0, 0, 0, 0.6);
  --shadow-nav-glow: 0 1px 0 var(--color-brushed-silver);

  /* Industrial Borders */
  --border-thin: 1px solid var(--color-brushed-silver);
  --border-medium: 1px solid var(--color-blueprint-gray);
  --border-accent: 2px solid var(--color-copper);
  --border-nameplate: 1px solid var(--color-mechanical-gray);

  /* Typography Scale */
  --font-display: 'Oswald', 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Consolas', monospace;

  --text-h1: 52px;
  --text-h2: 36px;
  --text-h3: 24px;
  --text-h4: 20px;
  --text-body: 17px;
  --text-small: 14px;
  --text-data: 42px;
  --text-label: 12px;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 48px;
  --space-2xl: 64px;

  /* Layout */
  --container-max: 1280px;
  --nav-height: 72px;
  --gutter: 24px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-medium: 200ms ease;
  --transition-slow: 300ms ease;
}

/* ============================================
   2. CSS RESET & BASE
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.65;
  color: var(--color-text-primary);
  background-color: var(--color-industrial-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

input, button, textarea, select {
  font: inherit;
}

p, h1, h2, h3, h4, h5, h6 {
  overflow-wrap: break-word;
}

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

ul, ol {
  list-style: none;
}

/* ============================================
   3. TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  color: var(--color-text-primary);
  text-wrap: balance;
}

h1 {
  font-size: var(--text-h1);
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

h2 {
  font-size: var(--text-h2);
  letter-spacing: 0.01em;
  text-transform: uppercase;
}

h3 {
  font-size: var(--text-h3);
  line-height: 1.35;
}

h4 {
  font-size: var(--text-h4);
  font-weight: 500;
  line-height: 1.4;
}

.text-data {
  font-family: var(--font-mono);
  font-size: var(--text-data);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.text-label {
  font-family: var(--font-mono);
  font-size: var(--text-label);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.text-small {
  font-size: var(--text-small);
  line-height: 1.5;
  letter-spacing: 0.02em;
}

/* ============================================
   4. LAYOUT & GRID
   ============================================ */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-xl);
  padding-right: var(--space-xl);
}

.row {
  display: flex;
  flex-wrap: wrap;
  margin-left: calc(var(--gutter) / -2);
  margin-right: calc(var(--gutter) / -2);
}

.col {
  flex: 1 0 0%;
  padding-left: calc(var(--gutter) / 2);
  padding-right: calc(var(--gutter) / 2);
}

.col-1,
.col-2,
.col-3,
.col-4,
.col-5,
.col-6,
.col-7,
.col-8,
.col-9,
.col-10,
.col-11,
.col-12 {
  flex: 0 0 100%;
  max-width: 100%;
}

/* ============================================
   5. COMPONENTS
   ============================================ */

/* 5.1 Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-family: var(--font-display);
  font-size: var(--text-small);
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
  border: none;
  transition: var(--transition-fast);
  min-height: 48px;
  padding: 0 28px;
}

.btn-primary {
  background-color: var(--color-steel-blue);
  color: #fff;
  border-radius: 2px;
  border-bottom: 1px solid transparent;
}

.btn-primary:hover {
  background-color: var(--color-steel-blue-dark);
  border-bottom: 3px solid var(--color-copper);
}

.btn-accent {
  background-color: var(--color-copper);
  color: var(--color-charcoal);
  border-radius: 2px;
  min-height: 52px;
  padding: 0 32px;
}

.btn-accent:hover {
  background-color: var(--color-charcoal);
  color: var(--color-copper);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-steel-blue);
  border-radius: 2px;
  border: 1px solid var(--color-steel-blue);
}

.btn-secondary:hover {
  background-color: rgba(43, 58, 78, 0.12);
}

.btn-ghost {
  background-color: transparent;
  color: #fff;
  border-radius: 2px;
  border: 1px solid rgba(255, 255, 255, 0.4);
}

.btn-ghost:hover {
  background-color: rgba(255, 255, 255, 0.12);
}

.btn-nameplate {
  font-family: var(--font-mono);
  font-size: var(--text-label);
  background-color: var(--color-charcoal);
  color: var(--color-brushed-silver);
  border-radius: 0;
  border: var(--border-nameplate);
  min-height: 48px;
  padding: 0 20px;
}

.btn-nameplate:hover {
  border-color: var(--color-brushed-silver);
  color: #fff;
}

.btn-sm {
  min-height: 48px;
  padding: 0 20px;
  font-size: var(--text-label);
}

/* 5.2 Cards */
.card {
  background-color: var(--color-industrial-white);
  border-radius: 4px;
  border: var(--border-thin);
  transition: var(--transition-medium);
}

.card-product {
  box-shadow: var(--shadow-card);
}

.card-product:hover {
  border-color: var(--color-copper);
  transform: scale(1.01);
}

.card-data {
  background-color: var(--color-blueprint-gray);
}

.card-data:hover {
  border-color: var(--color-copper);
}

.card-nameplate {
  background-color: var(--color-charcoal);
  border-radius: 0;
  border: var(--border-nameplate);
  box-shadow: var(--shadow-inset-nameplate);
  color: var(--color-brushed-silver);
}

.card-nameplate:hover {
  border-color: var(--color-brushed-silver);
}

/* 5.3 Forms */
.form-input {
  width: 100%;
  height: 48px;
  padding: 0 var(--space-md);
  font-family: var(--font-body);
  font-size: var(--text-body);
  color: var(--color-text-primary);
  background-color: var(--color-industrial-white);
  border: 1px solid var(--color-brushed-silver);
  border-radius: 2px;
  transition: var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-steel-blue);
  border-bottom: 2px solid var(--color-copper);
}

/* Global focus ring for accessibility */
:focus-visible {
  outline: 2px solid var(--color-copper);
  outline-offset: 2px;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--color-copper);
  outline-offset: 2px;
}

.form-input::placeholder {
  color: var(--color-text-secondary);
}

.form-label {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-small);
  font-weight: 500;
  color: var(--color-mechanical-gray);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}

.form-group {
  margin-bottom: var(--space-lg);
}

/* 5.4 Tables */
.table-industrial-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.table-industrial {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-body);
}

.table-industrial thead {
  background-color: var(--color-steel-blue);
  color: var(--color-industrial-white);
}

.table-industrial thead th {
  padding: var(--space-md) var(--space-lg);
  font-family: var(--font-display);
  font-size: var(--text-small);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-align: left;
  border-bottom: 2px solid var(--color-copper);
}

.table-industrial tbody tr {
  border-bottom: 1px solid var(--color-blueprint-gray);
}

.table-industrial tbody td {
  padding: var(--space-md) var(--space-lg);
  vertical-align: middle;
}

.table-industrial tbody tr:hover {
  background-color: var(--color-blueprint-gray);
}

/* 5.5 Navigation */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background-color: transparent;
  transition: background-color var(--transition-medium), box-shadow var(--transition-medium);
}

.site-header--scrolled {
  background-color: var(--color-industrial-white);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-nav-glow);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.site-nav__link {
  position: relative;
  font-family: var(--font-display);
  font-size: var(--text-body);
  font-weight: 500;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  padding: var(--space-sm) 0;
  transition: color var(--transition-fast);
  display: inline-flex;
  align-items: center;
  min-height: 48px;
}

.site-nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-copper);
  transition: width var(--transition-fast);
}

.site-nav__link:hover {
  color: var(--color-steel-blue);
}

.site-nav__link:hover::after {
  width: 100%;
}

/* ============================================
   6. INDUSTRIAL VISUAL ELEMENTS
   ============================================ */

/* 6.1 Blueprint Grid Background */
.blueprint-grid {
  position: relative;
}

.blueprint-grid::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

.blueprint-grid--dark::before {
  background-image:
    linear-gradient(rgba(192, 192, 192, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(192, 192, 192, 0.06) 1px, transparent 1px);
}

/* 6.2 Dimension Lines */
.dimension-line {
  position: relative;
  display: inline-block;
  padding: 0 16px;
}

.dimension-line::before,
.dimension-line::after {
  content: '';
  position: absolute;
  top: 50%;
  width: 12px;
  height: 1px;
  background-color: var(--color-brushed-silver);
  transition: width 300ms ease, background-color 300ms ease;
}

.dimension-line::before { left: 0; }
.dimension-line::after  { right: 0; }

.dimension-line:hover::before,
.dimension-line:hover::after {
  width: 20px;
  background-color: var(--color-copper);
}

/* 6.3 Hatch Pattern for Composite Materials */
.hatch-diamond {
  fill: url(#hatch-diamond);
}

.hatch-copper {
  fill: url(#hatch-copper);
}

.hatch-sic {
  fill: url(#hatch-sic);
}

/* SVG Patterns (embedded via CSS background or inline SVG) */
.svg-patterns {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

/* 6.4 Metal Nameplate */
.nameplate {
  display: inline-block;
  background-color: var(--color-charcoal);
  border: var(--border-nameplate);
  border-radius: 0;
  padding: var(--space-md) var(--space-lg);
  box-shadow: var(--shadow-inset-nameplate);
  color: var(--color-brushed-silver);
  font-family: var(--font-mono);
}

.nameplate__value {
  font-size: var(--text-data);
  font-weight: 700;
  color: var(--color-copper);
  line-height: 1;
}

.nameplate__label {
  font-size: var(--text-label);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: var(--space-sm);
}

/* 6.5 Safety & Industrial Labels */
.label-safety {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  font-family: var(--font-mono);
  font-size: var(--text-label);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: 0;
}

.label-safety--heat {
  background-color: var(--color-warning);
  color: var(--color-charcoal);
}

.label-safety--precision {
  background-color: var(--color-steel-blue);
  color: var(--color-industrial-white);
}

.label-safety--cert {
  background-color: transparent;
  color: var(--color-mechanical-gray);
  border: 1px solid var(--color-mechanical-gray);
}

/* ============================================
   7. PAGE SECTIONS
   ============================================ */

/* Hero Section */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background-color: var(--color-charcoal);
  color: #fff;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.4;
}

.hero__content {
  position: relative;
  z-index: 2;
  max-width: 800px;
}

.hero__title {
  font-size: clamp(36px, 5vw, 52px);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  line-height: 1.1;
  margin-bottom: var(--space-lg);
}

.hero__subtitle {
  font-size: clamp(16px, 2vw, 20px);
  line-height: 1.6;
  color: var(--color-brushed-silver);
  margin-bottom: var(--space-xl);
}

.hero__cta {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.hero__cta .btn {
  width: 100%;
}

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

.section--dark {
  background-color: var(--color-charcoal);
  color: #fff;
}

.section--gray {
  background-color: var(--color-blueprint-gray);
}

.section__header {
  margin-bottom: var(--space-xl);
}

.section__title {
  position: relative;
  display: inline-block;
  padding-bottom: var(--space-md);
}

.section__title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 2px;
  background-color: var(--color-copper);
}

/* Data Display Section */
.data-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.data-item {
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
}

.data-item__number {
  font-family: var(--font-mono);
  font-size: var(--text-data);
  font-weight: 700;
  color: var(--color-copper);
  line-height: 1;
}

.data-item__label {
  font-family: var(--font-mono);
  font-size: var(--text-label);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
  margin-top: var(--space-sm);
}

/* Product Grid */
.product-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.product-card__image {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background-color: var(--color-blueprint-gray);
}

.product-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.product-card:hover .product-card__image img {
  transform: scale(1.02);
}

.product-card__body {
  padding: var(--space-lg);
}

.product-card__title {
  font-family: var(--font-display);
  font-size: var(--text-h4);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.product-card__specs {
  font-family: var(--font-mono);
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

/* Application Areas */
.app-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.app-card {
  padding: var(--space-xl);
  text-align: center;
  transition: var(--transition-medium);
}

.app-card__icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-md);
  color: var(--color-copper);
}

.app-card__title {
  font-family: var(--font-display);
  font-size: var(--text-h4);
  margin-bottom: var(--space-sm);
}

.app-card__desc {
  font-size: var(--text-small);
  color: var(--color-text-secondary);
}

/* Testimonial */
.testimonial {
  padding: var(--space-xl);
  border-left: 4px solid var(--color-copper);
}

.testimonial__quote {
  font-size: var(--text-h4);
  font-style: italic;
  line-height: 1.5;
  margin-bottom: var(--space-md);
}

.testimonial__author {
  font-family: var(--font-mono);
  font-size: var(--text-small);
  color: var(--color-text-secondary);
}

/* CTA Section */
.cta-section {
  text-align: center;
  padding: var(--space-2xl) var(--space-xl);
}

.cta-section__title {
  font-size: var(--text-h2);
  margin-bottom: var(--space-md);
}

.cta-section__desc {
  font-size: var(--text-body);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* Footer */
.site-footer {
  background-color: var(--color-charcoal);
  color: var(--color-brushed-silver);
  padding: var(--space-2xl) 0 var(--space-xl);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.site-footer__title {
  font-family: var(--font-display);
  font-size: var(--text-h4);
  color: #fff;
  margin-bottom: var(--space-md);
  text-transform: uppercase;
}

.site-footer__link {
  display: block;
  font-size: var(--text-small);
  color: var(--color-brushed-silver);
  padding: var(--space-xs) 0;
  transition: color var(--transition-fast);
}

.site-footer__link:hover {
  color: var(--color-copper);
}

.site-footer__bottom {
  border-top: 1px solid var(--color-mechanical-gray);
  padding-top: var(--space-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* ============================================
   8. WOOCOMMERCE OVERRIDES
   ============================================ */
.woocommerce .product-type-simple .cart,
.woocommerce .product-type-variable .cart {
  display: none;
}

.woocommerce .product .price {
  display: none;
}

.woocommerce .product .stock {
  display: none;
}

.woocommerce .product .woocommerce-product-details__short-description {
  margin-bottom: var(--space-lg);
}

.woocommerce .product .product_meta {
  font-family: var(--font-mono);
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  border-top: 1px solid var(--color-blueprint-gray);
  padding-top: var(--space-md);
  margin-top: var(--space-lg);
}

.woocommerce-breadcrumb {
  font-family: var(--font-mono);
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
}

.woocommerce-breadcrumb a {
  color: var(--color-steel-blue);
}

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

/* ============================================
   9. UTILITIES
   ============================================ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-uppercase { text-transform: uppercase; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--space-sm); }
.mt-2 { margin-top: var(--space-md); }
.mt-3 { margin-top: var(--space-lg); }
.mt-4 { margin-top: var(--space-xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--space-sm); }
.mb-2 { margin-bottom: var(--space-md); }
.mb-3 { margin-bottom: var(--space-lg); }
.mb-4 { margin-bottom: var(--space-xl); }

/* ============================================
   10. MEDIA QUERIES
   ============================================ */

/* Tablet: 768px - 1024px */
@media (max-width: 1024px) {
  :root {
    --text-h1: 42px;
    --text-h2: 32px;
    --text-h3: 22px;
    --text-data: 36px;
  }

  .container {
    padding-left: var(--space-lg);
    padding-right: var(--space-lg);
  }

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

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

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

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

/* Mobile: < 768px */
@media (max-width: 767px) {
  :root {
    --text-h1: 32px;
    --text-h2: 28px;
    --text-h3: 20px;
    --text-h4: 18px;
    --text-data: 32px;
    --space-xl: 32px;
    --space-2xl: 48px;
  }

  .container {
    padding-left: var(--space-md);
    padding-right: var(--space-md);
  }

  .site-nav {
    display: none;
  }

  .data-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
  }

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

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

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .site-footer__bottom {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }

  .hero__cta {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}

/* Large Desktop: > 1440px */
@media (min-width: 1440px) {
  .container {
    max-width: 1440px;
  }
}

/* ============================================
   12. LANGUAGE SWITCHER
   ============================================ */
.language-switcher {
  position: relative;
}

.language-switcher__toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  background: none;
  border: none;
  font-family: var(--font-mono);
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  cursor: pointer;
  padding: var(--space-xs) var(--space-sm);
  transition: color var(--transition-fast);
}

.language-switcher__toggle:hover {
  color: var(--color-steel-blue);
}

.language-switcher__flag {
  font-weight: 700;
  color: var(--color-copper);
}

.language-switcher__menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--color-industrial-white);
  border: var(--border-thin);
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  min-width: 180px;
  padding: var(--space-xs) 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity 200ms ease, transform 200ms ease, visibility 200ms ease;
  z-index: 1001;
  list-style: none;
}

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

.language-switcher__item {}

.language-switcher__link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-body);
  font-size: var(--text-small);
  color: var(--color-text-primary);
  transition: background-color var(--transition-fast);
}

.language-switcher__link:hover {
  background-color: var(--color-blueprint-gray);
}

.language-switcher__item--active .language-switcher__link {
  color: var(--color-steel-blue);
  font-weight: 600;
}

.language-switcher__check {
  margin-left: auto;
}

/* ============================================
   13. PRODUCT COMPARE BAR & MODAL
   ============================================ */
.compare-floating-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--color-charcoal);
  border-top: 2px solid var(--color-copper);
  z-index: 998;
  padding: var(--space-md) 0;
  transform: translateY(0);
  transition: transform 300ms ease;
}

.compare-floating-bar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-xl);
  gap: var(--space-lg);
}

.compare-floating-bar__items {
  display: flex;
  gap: var(--space-md);
  flex: 1;
  overflow-x: auto;
}

.compare-floating-bar__item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  background: rgba(255, 255, 255, 0.06);
  border-radius: 2px;
  padding: var(--space-xs) var(--space-sm);
  min-width: 0;
}

.compare-floating-bar__item img {
  width: 40px;
  height: 40px;
  object-fit: cover;
  border-radius: 2px;
  flex-shrink: 0;
}

.compare-floating-bar__placeholder {
  width: 40px;
  height: 40px;
  background: var(--color-mechanical-gray);
  border-radius: 2px;
  flex-shrink: 0;
}

.compare-floating-bar__name {
  font-size: var(--text-small);
  color: #fff;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 140px;
}

.compare-floating-bar__remove {
  background: none;
  border: none;
  color: var(--color-brushed-silver);
  font-size: 18px;
  cursor: pointer;
  line-height: 1;
  padding: 0 2px;
}

.compare-floating-bar__remove:hover {
  color: var(--color-error);
}

.compare-floating-bar__actions {
  display: flex;
  gap: var(--space-sm);
  flex-shrink: 0;
}

.compare-modal {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 300ms ease, visibility 300ms ease;
}

.compare-modal.is-open {
  opacity: 1;
  visibility: visible;
}

.compare-modal__overlay {
  position: absolute;
  inset: 0;
  background: rgba(18, 18, 18, 0.85);
}

.compare-modal__content {
  position: relative;
  background: var(--color-industrial-white);
  border-radius: 4px;
  max-width: 90vw;
  max-height: 85vh;
  overflow: auto;
  width: 100%;
  padding: var(--space-xl);
}

.compare-modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}

.compare-modal__header h3 {
  font-family: var(--font-display);
  font-size: var(--text-h3);
  margin: 0;
}

.compare-modal__close {
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--color-brushed-silver);
  border-radius: 2px;
  font-size: 24px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color var(--transition-fast);
}

.compare-modal__close:hover {
  border-color: var(--color-copper);
}

/* Compare button on product cards/pages */
.compare-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-mono);
  font-size: var(--text-label);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: transparent;
  border: 1px solid var(--color-brushed-silver);
  color: var(--color-text-secondary);
  padding: var(--space-xs) var(--space-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.compare-btn:hover,
.compare-btn.is-added {
  border-color: var(--color-copper);
  color: var(--color-copper);
}

/* ============================================
   14. ORDER TRACKING STEPS
   ============================================ */
.tracking-steps {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) 0;
}

.tracking-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  flex: 0 0 auto;
}

.tracking-step__dot {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-blueprint-gray);
  color: var(--color-text-secondary);
  font-family: var(--font-mono);
  font-size: var(--text-body);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--color-brushed-silver);
  transition: all var(--transition-medium);
}

.tracking-step.is-active .tracking-step__dot {
  background: var(--color-steel-blue);
  color: #fff;
  border-color: var(--color-steel-blue);
}

.tracking-step.is-completed .tracking-step__dot {
  background: var(--color-success);
  color: #fff;
  border-color: var(--color-success);
}

.tracking-step__label {
  font-family: var(--font-mono);
  font-size: var(--text-label);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
}

.tracking-step.is-active .tracking-step__label {
  color: var(--color-text-primary);
  font-weight: 600;
}

.tracking-step__line {
  flex: 1;
  height: 2px;
  background: var(--color-blueprint-gray);
  margin: 0 var(--space-sm);
  margin-bottom: 28px;
  transition: background-color var(--transition-medium);
}

.tracking-step__line.is-active {
  background: var(--color-steel-blue);
}

/* ============================================
   15. BREADCRUMB
   ============================================ */
.mpcvd-breadcrumb {
  font-family: var(--font-mono);
  font-size: var(--text-small);
  color: var(--color-text-secondary);
}

.mpcvd-breadcrumb a {
  color: var(--color-steel-blue);
  transition: color var(--transition-fast);
}

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

.mpcvd-breadcrumb__current {
  color: var(--color-text-primary);
  font-weight: 600;
}

.mpcvd-breadcrumb__sep {
  margin: 0 6px;
  color: var(--color-brushed-silver);
}

/* ============================================
   16. MOBILE MENU
   ============================================ */
.mobile-menu {
  display: none;
}

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

/* ============================================
   17. WECHAT QR FIX
   ============================================ */
#wechat-qr-modal .lightbox__content {
  padding: var(--space-xl);
}

/* ============================================
   18. RTL (Right-to-Left) SUPPORT
   ============================================ */
html[dir="rtl"] body {
  direction: rtl;
  text-align: right;
}

/* Flip flex directions */
html[dir="rtl"] .site-header__inner,
html[dir="rtl"] .site-footer__bottom,
html[dir="rtl"] .row,
html[dir="rtl"] .hero__cta,
html[dir="rtl"] .product-info__actions,
html[dir="rtl"] .case-study-card,
html[dir="rtl"] .compare-floating-bar__inner,
html[dir="rtl"] .compare-modal__header,
html[dir="rtl"] .floating-chat__item,
html[dir="rtl"] .social-proof,
html[dir="rtl"] .download-card,
html[dir="rtl"] .solution-steps {
  flex-direction: row-reverse;
}

html[dir="rtl"] .site-footer__grid {
  direction: rtl;
}

/* Flip text alignment */
html[dir="rtl"] .text-center { text-align: center; }
html[dir="rtl"] .section__title::after {
  left: auto;
  right: 0;
}

html[dir="rtl"] .testimonial {
  border-left: none;
  border-right: 4px solid var(--color-copper);
}

html[dir="rtl"] .social-proof {
  border-left: none;
  border-right: 3px solid var(--color-copper);
  border-radius: 2px 0 0 2px;
}

html[dir="rtl"] .case-study-card__result {
  border-left: none;
  border-right: 3px solid var(--color-copper);
}

/* Language switcher in RTL */
html[dir="rtl"] .language-switcher__menu {
  right: auto;
  left: 0;
}

html[dir="rtl"] .language-switcher__link {
  flex-direction: row-reverse;
}

html[dir="rtl"] .language-switcher__check {
  margin-left: 0;
  margin-right: auto;
}

/* Mobile menu toggle position */
html[dir="rtl"] .mobile-menu-toggle {
  margin-left: 0;
  margin-right: var(--space-md);
}

/* Floating chat position */
html[dir="rtl"] .floating-chat {
  right: auto;
  left: 24px;
}

html[dir="rtl"] .floating-chat__menu {
  right: auto;
  left: 0;
}

/* Compare floating bar */
html[dir="rtl"] .compare-floating-bar__items {
  direction: rtl;
}

/* Form checkbox alignment */
html[dir="rtl"] .form-label input[type="checkbox"] {
  margin-right: 0;
  margin-left: var(--space-xs);
}

/* Table cells */
html[dir="rtl"] .table-industrial thead th,
html[dir="rtl"] .table-industrial tbody td {
  text-align: right;
}

html[dir="rtl"] .compare-table thead th,
html[dir="rtl"] .compare-table tbody td {
  text-align: right;
}

/* Breadcrumb separator */
html[dir="rtl"] .mpcvd-breadcrumb__sep {
  display: inline-block;
  transform: scaleX(-1);
}

/* Accordion icon */
html[dir="rtl"] .accordion__icon {
  transform: scaleX(-1);
}

html[dir="rtl"] .accordion__header[aria-expanded="true"] .accordion__icon {
  transform: scaleX(-1) rotate(180deg);
}

/* Navigation link underline */
html[dir="rtl"] .site-nav__link::after {
  left: auto;
  right: 0;
}

/* Tracking steps */
html[dir="rtl"] .tracking-steps {
  direction: rtl;
}

/* Product gallery thumbs */
html[dir="rtl"] .product-gallery__thumbs {
  direction: rtl;
}

/* Arabic font support - add Noto Sans Arabic to font stack */
html[dir="rtl"] body,
html[dir="rtl"] h1,
html[dir="rtl"] h2,
html[dir="rtl"] h3,
html[dir="rtl"] h4,
html[dir="rtl"] h5,
html[dir="rtl"] h6 {
  font-family: 'Noto Sans Arabic', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

html[dir="rtl"] .text-label,
html[dir="rtl"] .form-label,
html[dir="rtl"] .nameplate,
html[dir="rtl"] .nameplate__label,
html[dir="rtl"] .data-item__label {
  letter-spacing: 0;
}

/* ============================================
   19. MIDDLE EAST MARKET BADGE
   ============================================ */
.mena-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  background: linear-gradient(135deg, #006C35 0%, #007A3D 100%);
  color: #fff;
  font-family: var(--font-mono);
  font-size: var(--text-label);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: 2px;
}

.mena-badge__flag {
  width: 16px;
  height: 12px;
  background: #fff;
  border-radius: 1px;
}

/* Middle East office accent — applied via accordion override */
.contact-offices .accordion__item:last-child .accordion__header {
  border-right: 3px solid #006C35;
}

html[dir="rtl"] .contact-offices .accordion__item:last-child .accordion__header {
  border-right: none;
  border-left: 3px solid #006C35;
}

/* ============================================
   11. NEW COMPONENTS (补充开发)
   ============================================ */

/* 11.1 Skeleton Shimmer Loading */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-blueprint-gray) 25%,
    #f0eeea 50%,
    var(--color-blueprint-gray) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s infinite;
  border-radius: 2px;
}

@keyframes skeleton-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-text {
  height: 16px;
  margin-bottom: 8px;
}

.skeleton-title {
  height: 24px;
  width: 60%;
  margin-bottom: 16px;
}

.skeleton-image {
  aspect-ratio: 4 / 3;
  width: 100%;
}

/* 11.2 Accordion */
.accordion {
  border: var(--border-thin);
  border-radius: 2px;
  overflow: hidden;
}

.accordion__item {
  border-bottom: 1px solid var(--color-blueprint-gray);
}

.accordion__item:last-child {
  border-bottom: none;
}

.accordion__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  font-family: var(--font-display);
  font-size: var(--text-h4);
  font-weight: 500;
  text-align: left;
  background: none;
  border: none;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.accordion__header:hover {
  background-color: var(--color-blueprint-gray);
}

.accordion__header[aria-expanded="true"] {
  background-color: var(--color-blueprint-gray);
}

.accordion__icon {
  width: 20px;
  height: 20px;
  transition: transform var(--transition-medium);
  flex-shrink: 0;
}

.accordion__header[aria-expanded="true"] .accordion__icon {
  transform: rotate(180deg);
}

.accordion__panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

.accordion__panel.is-open {
  grid-template-rows: 1fr;
}

.accordion__panel-inner {
  overflow: hidden;
}

.accordion__content {
  padding: 0 var(--space-lg) var(--space-lg);
  font-size: var(--text-body);
  line-height: 1.65;
  color: var(--color-text-secondary);
}

/* 11.3 Floating Chat Widget */
.floating-chat {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 999;
}

.floating-chat__toggle {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background-color: var(--color-copper);
  color: var(--color-charcoal);
  border: none;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.floating-chat__toggle:hover {
  transform: scale(1.08);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}

.floating-chat__menu {
  position: absolute;
  bottom: 68px;
  right: 0;
  background: var(--color-charcoal);
  border: 1px solid var(--color-mechanical-gray);
  border-radius: 4px;
  padding: var(--space-sm);
  min-width: 200px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 200ms ease, transform 200ms ease, visibility 200ms ease;
}

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

.floating-chat__item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  color: var(--color-brushed-silver);
  font-size: var(--text-small);
  border-radius: 2px;
  transition: background-color var(--transition-fast);
}

.floating-chat__item:hover {
  background-color: rgba(255, 255, 255, 0.06);
  color: #fff;
}

.floating-chat__label {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
  padding: var(--space-xs) var(--space-md);
  margin-top: var(--space-xs);
}

/* 11.4 Product Comparison Table */
.compare-table-wrapper {
  overflow-x: auto;
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-body);
  min-width: 600px;
}

.compare-table thead th {
  background-color: var(--color-steel-blue);
  color: var(--color-industrial-white);
  padding: var(--space-md) var(--space-lg);
  font-family: var(--font-display);
  font-size: var(--text-small);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-align: left;
  border-bottom: 2px solid var(--color-copper);
}

.compare-table tbody td {
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-blueprint-gray);
  vertical-align: middle;
}

.compare-table tbody tr:nth-child(even) {
  background-color: var(--color-blueprint-gray);
}

.compare-table tbody tr:hover {
  background-color: rgba(184, 115, 51, 0.06);
}

.compare-table .highlight-cell {
  background-color: rgba(184, 115, 51, 0.12);
  font-weight: 600;
  color: var(--color-steel-blue);
}

.compare-table .winner {
  color: var(--color-success);
  font-weight: 700;
}

.compare-table tr.diff-highlight td {
  background-color: rgba(184, 115, 51, 0.08);
}

.compare-table tr.diff-highlight td:first-child {
  border-left: 3px solid var(--color-copper);
}

/* 11.5 Certificate Carousel */
.cert-carousel {
  position: relative;
  overflow: hidden;
}

.cert-carousel__track {
  display: flex;
  gap: var(--space-lg);
  transition: transform var(--transition-medium);
}

.cert-carousel__item {
  flex: 0 0 calc(25% - 18px);
  min-width: 200px;
}

.cert-carousel__card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-xl);
  text-align: center;
  background: var(--color-industrial-white);
  border: var(--border-thin);
  border-radius: 4px;
  transition: border-color var(--transition-fast), transform var(--transition-fast);
  cursor: pointer;
}

.cert-carousel__card:hover {
  border-color: var(--color-copper);
  transform: translateY(-2px);
}

.cert-carousel__thumb {
  width: 80px;
  height: 80px;
  background: var(--color-blueprint-gray);
  border-radius: 2px;
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.cert-carousel__nav {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.cert-carousel__btn {
  width: 48px;
  height: 48px;
  border: 1px solid var(--color-brushed-silver);
  background: transparent;
  border-radius: 2px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.cert-carousel__btn:hover {
  border-color: var(--color-copper);
  background-color: rgba(184, 115, 51, 0.06);
}

/* 11.6 Manufacturer Cards */
.manufacturer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.manufacturer-card {
  padding: var(--space-xl);
  text-align: center;
  background: var(--color-industrial-white);
  border: var(--border-thin);
  border-radius: 4px;
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.manufacturer-card:hover {
  border-color: var(--color-copper);
  transform: translateY(-2px);
}

.manufacturer-card__logo {
  width: 120px;
  height: 60px;
  background: var(--color-blueprint-gray);
  border-radius: 2px;
  margin: 0 auto var(--space-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: var(--text-small);
  color: var(--color-text-secondary);
}

.manufacturer-card__name {
  font-family: var(--font-display);
  font-size: var(--text-h4);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.manufacturer-card__meta {
  font-family: var(--font-mono);
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.manufacturer-card__tag {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-blueprint-gray);
  font-family: var(--font-mono);
  font-size: var(--text-label);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-steel-blue);
  border-radius: 2px;
}

/* 11.7 Social Proof */
.social-proof {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-blueprint-gray);
  border-left: 3px solid var(--color-copper);
  border-radius: 0 2px 2px 0;
  margin-bottom: var(--space-lg);
}

.social-proof__icon {
  width: 40px;
  height: 40px;
  background: var(--color-steel-blue);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.social-proof__text {
  font-family: var(--font-mono);
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.social-proof__text strong {
  color: var(--color-text-primary);
}

/* 11.8 Partner Logo Wall */
.logo-wall {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-xl);
  padding: var(--space-xl) 0;
}

.logo-wall__item {
  width: 160px;
  height: 60px;
  background: var(--color-blueprint-gray);
  border-radius: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  opacity: 0.7;
  transition: opacity var(--transition-fast);
}

.logo-wall__item:hover {
  opacity: 1;
}

/* 11.9 Application Detail Page */
.app-detail-hero {
  position: relative;
  min-height: 50vh;
  display: flex;
  align-items: center;
  background-color: var(--color-charcoal);
  color: #fff;
  overflow: hidden;
}

.app-detail-hero__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.3;
}

.app-detail-hero__content {
  position: relative;
  z-index: 2;
}

.app-detail-hero__title {
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin-bottom: var(--space-md);
}

.app-detail-hero__subtitle {
  font-size: var(--text-body);
  color: var(--color-brushed-silver);
  max-width: 600px;
}

.app-detail-section {
  padding: var(--space-2xl) 0;
}

.app-detail-section--dark {
  background-color: var(--color-charcoal);
  color: #fff;
}

.app-detail-section--gray {
  background-color: var(--color-blueprint-gray);
}

/* 11.10 Technical Diagram (Blueprint Style) */
.tech-diagram {
  background-color: var(--color-anodized-blue);
  border-radius: 4px;
  padding: var(--space-xl);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.tech-diagram::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}

.tech-diagram__svg {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
  display: block;
}

/* 11.11 Case Study Card */
.case-study-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
  padding: var(--space-xl);
  background: var(--color-industrial-white);
  border: var(--border-thin);
  border-radius: 4px;
}

.case-study-card__meta {
  font-family: var(--font-mono);
  font-size: var(--text-label);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-copper);
  margin-bottom: var(--space-sm);
}

.case-study-card__title {
  font-family: var(--font-display);
  font-size: var(--text-h3);
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.case-study-card__result {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: var(--color-blueprint-gray);
  border-left: 3px solid var(--color-copper);
  margin-top: var(--space-lg);
}

.case-study-card__result-value {
  font-family: var(--font-mono);
  font-size: var(--text-h3);
  font-weight: 700;
  color: var(--color-steel-blue);
}

.case-study-card__result-label {
  font-family: var(--font-mono);
  font-size: var(--text-small);
  color: var(--color-text-secondary);
}

/* 11.12 Composite Product Matrix */
.composite-matrix {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.composite-card {
  padding: var(--space-xl);
  background: var(--color-industrial-white);
  border: var(--border-thin);
  border-radius: 4px;
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.composite-card:hover {
  border-color: var(--color-copper);
  transform: translateY(-4px);
}

.composite-card__badge {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-steel-blue);
  color: #fff;
  font-family: var(--font-mono);
  font-size: var(--text-label);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: 2px;
  margin-bottom: var(--space-md);
}

.composite-card__title {
  font-family: var(--font-display);
  font-size: var(--text-h3);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.composite-card__specs {
  margin-bottom: var(--space-lg);
}

.composite-card__spec-item {
  display: flex;
  justify-content: space-between;
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-blueprint-gray);
  font-size: var(--text-small);
}

.composite-card__spec-label {
  color: var(--color-text-secondary);
  font-family: var(--font-mono);
}

.composite-card__spec-value {
  font-weight: 600;
  color: var(--color-text-primary);
}

/* 11.13 Tech Center Download Card */
.download-card {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-industrial-white);
  border: var(--border-thin);
  border-radius: 2px;
  transition: border-color var(--transition-fast);
}

.download-card:hover {
  border-color: var(--color-copper);
}

.download-card__icon {
  width: 48px;
  height: 48px;
  background: var(--color-blueprint-gray);
  border-radius: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.download-card__info {
  flex: 1;
}

.download-card__title {
  font-family: var(--font-display);
  font-size: var(--text-h4);
  font-weight: 500;
  margin-bottom: 2px;
}

.download-card__meta {
  font-family: var(--font-mono);
  font-size: var(--text-label);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* 11.14 Custom Solution Steps */
.solution-steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  counter-reset: step;
}

.solution-step {
  flex: 1;
  text-align: center;
  position: relative;
}

.solution-step::before {
  counter-increment: step;
  content: counter(step);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--color-steel-blue);
  color: #fff;
  font-family: var(--font-mono);
  font-size: var(--text-h4);
  font-weight: 700;
  border-radius: 50%;
  margin: 0 auto var(--space-md);
}

.solution-step:not(:last-child)::after {
  content: '';
  position: absolute;
  top: 24px;
  left: calc(50% + 28px);
  width: calc(100% - 56px);
  height: 2px;
  background: var(--color-brushed-silver);
}

.solution-step__title {
  font-family: var(--font-display);
  font-size: var(--text-h4);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.solution-step__desc {
  font-size: var(--text-small);
  color: var(--color-text-secondary);
}

/* 11.15 Form Progress Bar Enhancement */
.form-progress {
  margin-bottom: var(--space-xl);
}

.form-progress__bar {
  height: 4px;
  background: var(--color-blueprint-gray);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: var(--space-sm);
}

.form-progress__fill {
  height: 100%;
  background: var(--color-copper);
  border-radius: 2px;
  transition: width 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

.form-progress__steps {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: var(--text-label);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
}

.form-progress__steps span.active {
  color: var(--color-copper);
  font-weight: 700;
}

/* 11.16 Lightbox Modal */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(18, 18, 18, 0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 300ms ease, visibility 300ms ease;
}

.lightbox.is-open {
  opacity: 1;
  visibility: visible;
}

.lightbox__content {
  max-width: 90vw;
  max-height: 90vh;
}

.lightbox__content img {
  max-width: 100%;
  max-height: 90vh;
  object-fit: contain;
}

.lightbox__close {
  position: absolute;
  top: 24px;
  right: 24px;
  width: 48px;
  height: 48px;
  background: transparent;
  border: 1px solid var(--color-brushed-silver);
  color: #fff;
  font-size: 24px;
  cursor: pointer;
  border-radius: 2px;
  transition: border-color var(--transition-fast);
}

.lightbox__close:hover {
  border-color: var(--color-copper);
}

/* ============================================
   10. MEDIA QUERIES (Mobile-First)
   ============================================ */

/* Tablet (768px+) */
@media (min-width: 768px) {
  .col-1 { flex: 0 0 8.333%; max-width: 8.333%; }
  .col-2 { flex: 0 0 16.666%; max-width: 16.666%; }
  .col-3 { flex: 0 0 25%; max-width: 25%; }
  .col-4 { flex: 0 0 33.333%; max-width: 33.333%; }
  .col-5 { flex: 0 0 41.666%; max-width: 41.666%; }
  .col-6 { flex: 0 0 50%; max-width: 50%; }
  .col-7 { flex: 0 0 58.333%; max-width: 58.333%; }
  .col-8 { flex: 0 0 66.666%; max-width: 66.666%; }
  .col-9 { flex: 0 0 75%; max-width: 75%; }
  .col-10 { flex: 0 0 83.333%; max-width: 83.333%; }
  .col-11 { flex: 0 0 91.666%; max-width: 91.666%; }
  .col-12 { flex: 0 0 100%; max-width: 100%; }

  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .app-grid { grid-template-columns: repeat(2, 1fr); }
  .data-grid { grid-template-columns: repeat(2, 1fr); }
  .manufacturer-grid { grid-template-columns: repeat(2, 1fr); }
  .composite-matrix { grid-template-columns: repeat(2, 1fr); }
  .site-footer__grid { grid-template-columns: repeat(2, 1fr); }

  .hero__cta { flex-direction: row; }
  .hero__cta .btn { width: auto; }
  .solution-steps { flex-direction: row; }
}

/* Desktop (1024px+) */
@media (min-width: 1024px) {
  .product-grid { grid-template-columns: repeat(3, 1fr); }
  .app-grid { grid-template-columns: repeat(3, 1fr); }
  .data-grid { grid-template-columns: repeat(4, 1fr); }
  .manufacturer-grid { grid-template-columns: repeat(3, 1fr); }
  .composite-matrix { grid-template-columns: repeat(3, 1fr); }
  .site-footer__grid { grid-template-columns: 2fr 1fr 1fr 1fr; }
}

/* Large Desktop (1440px+) */
@media (min-width: 1440px) {
  .container {
    max-width: 1280px;
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================
   12. COOKIE CONSENT BANNER (GDPR / CCPA)
   ============================================ */
.cookie-consent {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 9998;
  background: var(--color-charcoal);
  border-top: 2px solid var(--color-copper);
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.4);
  padding: var(--space-md) 0;
}

.cookie-consent__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-md);
}

.cookie-consent__body {
  flex: 1;
  min-width: 260px;
}

.cookie-consent__text {
  color: var(--color-brushed-silver);
  font-size: var(--text-small);
  line-height: 1.6;
  margin: 0;
}

.cookie-consent__actions {
  display: flex;
  gap: var(--space-sm);
  flex-shrink: 0;
}

.cookie-consent__privacy {
  width: 100%;
  text-align: right;
}

.cookie-consent__privacy a {
  font-size: var(--text-label);
  color: var(--color-brushed-silver);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.cookie-consent__privacy a:hover {
  color: var(--color-copper);
}

html[dir="rtl"] .cookie-consent__privacy {
  text-align: left;
}