/* ==========================================
   BA13 DIRECT - LANDING PAGE CSS
   ========================================== */

/* === VARIABLES & RESET === */
:root {
  /* Colors - Modern Professional Palette */
  --primary: #0066ff;
  --primary-dark: #0052cc;
  --primary-light: #4d94ff;
  --secondary: #00c853;
  --accent: #ff6d00;

  /* Product Colors */
  --color-standard: #64748b;
  --color-hydro: #10b981;
  --color-fire: #ef4444;
  --color-impact: #f59e0b;

  /* Neutrals */
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --font-display: "Inter", var(--font-sans);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;

  /* Borders */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  /* Shadows */
  --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 -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1),
    0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1),
    0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--gray-800);
  background: #fff;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
}

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

ul {
  list-style: none;
}

/* === CONTAINER === */
.container {
  width: 100%;
  max-width: 1600px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* === HEADER & NAVIGATION === */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid var(--gray-200);
}

.navbar {
  padding: var(--spacing-sm) 0;
}

.nav-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 0.25rem;
}

.logo .tagline {
  font-size: 0.75rem;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nav-menu {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

.nav-menu a {
  font-weight: 500;
  color: var(--gray-700);
  transition: color var(--transition-fast);
}

.nav-menu a:hover {
  color: var(--primary);
}

.btn-cta-nav {
  padding: 0.5rem 1.25rem;
  background: var(--primary);
  color: white !important;
  border-radius: var(--radius-md);
  font-weight: 600;
  transition: background var(--transition-fast);
}

.btn-cta-nav:hover {
  background: var(--primary-dark);
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 0.25rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.mobile-menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--gray-700);
  transition: all var(--transition-fast);
}

/* === HERO SECTION === */
.hero {
  position: relative;
  background: #ffffff;
  color: var(--gray-900);
  padding: 5rem 0 4rem;
  overflow: hidden;
  border-bottom: 1px solid var(--gray-200);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(0, 102, 255, 0.03) 1px, transparent 1px),
    linear-gradient(rgba(0, 102, 255, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  z-index: 0;
}

.hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background: linear-gradient(135deg, rgba(0, 102, 255, 0.05) 0%, rgba(0, 200, 83, 0.05) 100%);
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0% 100%);
  z-index: 0;
}

.hero-overlay {
  display: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  background: linear-gradient(135deg, #00c853 0%, #00a843 100%);
  border-radius: 50px;
  font-size: 0.875rem;
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
  border: none;
  box-shadow: 0 4px 12px rgba(0, 200, 83, 0.25);
  color: white;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.hero-badge::before {
  content: "✓";
  font-size: 1rem;
  font-weight: bold;
}

.hero-title {
  font-size: 3.75rem;
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: var(--spacing-lg);
  color: var(--gray-900);
  letter-spacing: -0.02em;
}

.hero-title .highlight {
  color: var(--primary);
  position: relative;
  display: inline-block;
}

.hero-title .highlight::after {
  content: "";
  position: absolute;
  bottom: 0.1em;
  left: 0;
  right: 0;
  height: 0.15em;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  opacity: 0.3;
  border-radius: 2px;
}

.hero-title .subtitle {
  display: block;
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--gray-700);
  margin-top: var(--spacing-sm);
}

.hero-description {
  font-size: 1.25rem;
  line-height: 1.7;
  margin-bottom: var(--spacing-xl);
  color: var(--gray-600);
  max-width: 750px;
  margin-left: auto;
  margin-right: auto;
  font-weight: 400;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  margin-bottom: var(--spacing-xl);
}

.hero-certifications {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: var(--spacing-xl);
}

.cert-badge {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.875rem 1.5rem;
  background: white;
  border-radius: var(--radius-lg);
  font-size: 0.9375rem;
  font-weight: 700;
  border: 2px solid var(--gray-200);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  transition: all var(--transition-base);
  color: var(--gray-800);
}

.cert-badge:hover {
  border-color: var(--primary);
  box-shadow: 0 4px 16px rgba(0, 102, 255, 0.15);
  transform: translateY(-2px);
}

.cert-icon {
  font-size: 1.375rem;
  color: var(--primary);
}

/* === BUTTONS === */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  border-radius: 12px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border: 2px solid transparent;
  font-size: 1rem;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.5s, height 0.5s;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn-primary {
  background: linear-gradient(
    135deg,
    var(--primary) 0%,
    var(--primary-dark) 100%
  );
  color: white;
  box-shadow: 0 4px 15px rgba(0, 102, 255, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 102, 255, 0.4);
}

.btn-secondary {
  background: white;
  color: var(--primary);
  border: 2px solid var(--primary);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.btn-secondary:hover {
  background: var(--primary);
  color: white;
  box-shadow: 0 4px 16px rgba(0, 102, 255, 0.25);
}

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

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

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1.125rem;
}

.btn-block {
  display: block;
  width: 100%;
}

/* === FEATURES BAR === */
.features-bar {
  background: var(--gray-50);
  padding: var(--spacing-xl) 0;
  border-bottom: 1px solid var(--gray-200);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.feature-item {
  text-align: center;
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--primary);
}

.feature-icon i {
  display: inline-block;
  transition: transform var(--transition-base);
}

.feature-item:hover .feature-icon i {
  transform: scale(1.1);
}

.feature-item h3 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 0.25rem;
}

.feature-item p {
  font-size: 0.875rem;
  color: var(--gray-600);
}

/* === SECTIONS === */
.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--spacing-2xl);
}

.section-header h2 {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: var(--spacing-sm);
}

.section-header p {
  font-size: 1.125rem;
  color: var(--gray-600);
}

/* === PRODUCTS SECTION === */
.products-section {
  padding: var(--spacing-2xl) 0;
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
}

@media (max-width: 1400px) {
  .products-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 1200px) {
  .products-grid {
    gap: var(--spacing-lg);
  }
}

.product-card {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: 16px;
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
  border-color: var(--primary-light);
}

.product-card.featured {
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
}

.product-badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: var(--accent);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-md);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  z-index: 10;
}

.product-header {
  padding: var(--spacing-lg);
  color: white;
  text-align: center;
}

.product-header.standard {
  background: linear-gradient(135deg, var(--color-standard), #94a3b8);
}

.product-header.hydro {
  background: linear-gradient(135deg, var(--color-hydro), #34d399);
}

.product-header.fire {
  background: linear-gradient(135deg, var(--color-fire), #f87171);
}

.product-header.impact {
  background: linear-gradient(135deg, var(--color-impact), #fbbf24);
}

.product-type {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.9;
  margin-bottom: 0.5rem;
}

.product-header h3 {
  font-size: 1.5rem;
  font-weight: 700;
}

.product-certifications {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--gray-50);
  border-bottom: 1px solid var(--gray-200);
}

.cert-tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: white;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--gray-700);
}

.product-description {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--gray-200);
}

.product-description p {
  color: var(--gray-600);
  line-height: 1.6;
}

.product-specs {
  padding: var(--spacing-md);
  background: var(--gray-50);
}

.product-specs li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--gray-200);
  font-size: 0.875rem;
  color: var(--gray-700);
}

.product-specs li:last-child {
  border-bottom: none;
}

.product-specs strong {
  color: var(--gray-900);
  font-weight: 600;
}

.product-footer {
  padding: var(--spacing-md);
}

/* === CERTIFICATIONS SECTION === */
.certifications-section {
  padding: var(--spacing-2xl) 0;
  background: var(--gray-50);
}

.certifications-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.cert-card {
  background: white;
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  text-align: center;
}

.cert-icon-large {
  font-size: 4rem;
  margin-bottom: var(--spacing-md);
  color: var(--primary);
}

.cert-icon-large i {
  display: inline-block;
  transition: transform var(--transition-base);
}

.cert-card:hover .cert-icon-large i {
  transform: scale(1.1) rotate(5deg);
}

.cert-card h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: var(--spacing-sm);
}

.cert-org {
  font-size: 0.875rem;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

.cert-card p {
  color: var(--gray-600);
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
}

.cert-details {
  text-align: left;
}

.cert-details li {
  padding: 0.5rem 0;
  color: var(--gray-700);
  font-size: 0.875rem;
}

.certifications-classifications {
  background: white;
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.certifications-classifications h3 {
  text-align: center;
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
}

.classifications-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
}

.classification-item {
  text-align: center;
}

.classification-item h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: var(--spacing-sm);
}

.class-badge {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-size: 1.25rem;
  font-weight: 700;
  color: white;
  margin-bottom: var(--spacing-sm);
}

.class-badge.fire {
  background: linear-gradient(135deg, var(--color-fire), #f87171);
}

.class-badge.water {
  background: linear-gradient(135deg, var(--color-hydro), #34d399);
}

.class-badge.impact {
  background: linear-gradient(135deg, var(--color-impact), #fbbf24);
}

.class-badge.standard {
  background: linear-gradient(135deg, var(--color-standard), #94a3b8);
}

.classification-item p {
  font-size: 0.875rem;
  color: var(--gray-600);
}

/* === ADVANTAGES SECTION === */
.advantages-section {
  padding: var(--spacing-2xl) 0;
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
}

@media (max-width: 1200px) {
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
  }
}

.advantage-card {
  background: white;
  padding: var(--spacing-xl);
  border: 1px solid var(--gray-200);
  border-radius: 16px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.advantage-card:hover {
  border-color: var(--primary-light);
  transform: translateY(-8px);
  box-shadow: 0 12px 28px rgba(0, 102, 255, 0.15);
}

.advantage-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  color: var(--primary);
}

.advantage-icon i {
  display: inline-block;
  transition: transform var(--transition-base);
}

.advantage-card:hover .advantage-icon i {
  transform: scale(1.15);
}

.advantage-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: var(--spacing-sm);
}

.advantage-card p {
  color: var(--gray-600);
  line-height: 1.6;
}

/* === APPLICATIONS SECTION === */
.applications-section {
  padding: var(--spacing-2xl) 0;
  background: var(--gray-50);
}

.applications-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.application-item {
  background: white;
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.application-item h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: var(--spacing-md);
}

.application-item h3 i {
  color: var(--primary);
  margin-right: 0.5rem;
}

.application-item ul li {
  padding: 0.5rem 0;
  color: var(--gray-700);
  border-bottom: 1px solid var(--gray-200);
}

.application-item ul li:last-child {
  border-bottom: none;
}

.application-item ul li::before {
  content: "→ ";
  color: var(--primary);
  font-weight: 700;
  margin-right: 0.5rem;
}

/* === CONTACT / QUOTE SECTION === */
.contact-section {
  padding: var(--spacing-2xl) 0;
  background: linear-gradient(135deg, #f3f4f6 0%, #e5e7eb 100%);
}

.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--spacing-xl);
  align-items: start;
}

.contact-info {
  position: sticky;
  top: 100px;
}

.contact-info h2 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: var(--spacing-md);
}

.contact-info > p {
  color: var(--gray-600);
  line-height: 1.6;
  margin-bottom: var(--spacing-xl);
}

.contact-details {
  margin-bottom: var(--spacing-xl);
}

.detail-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: white;
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-sm);
}

.detail-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
  color: var(--primary);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 102, 255, 0.1);
  border-radius: 50%;
}

.detail-item h4 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 0.25rem;
}

.detail-item a {
  color: var(--primary);
  font-weight: 500;
}

.detail-item a:hover {
  text-decoration: underline;
}

.trust-indicators {
  background: white;
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
}

.trust-indicators h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: var(--spacing-md);
}

.trust-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
}

.stat {
  text-align: center;
}

.stat strong {
  display: block;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
}

.stat span {
  font-size: 0.75rem;
  color: var(--gray-600);
}

/* === CONTACT FORM === */
.contact-form-wrapper {
  background: white;
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-group label {
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: 0.75rem;
  border: 2px solid var(--gray-300);
  border-radius: var(--radius-md);
  font-size: 1rem;
  transition: border-color var(--transition-fast);
  font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
}

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

.checkbox-group {
  flex-direction: row;
  align-items: flex-start;
}

.checkbox-group label {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  cursor: pointer;
  font-weight: 400;
}

.checkbox-group input[type="checkbox"] {
  margin-top: 0.25rem;
  width: 1.25rem;
  height: 1.25rem;
  cursor: pointer;
}

.form-notice {
  font-size: 0.75rem;
  color: var(--gray-500);
  text-align: center;
  margin-top: var(--spacing-sm);
}

.form-message {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-md);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  animation: slideInDown 0.4s ease-out;
  box-shadow: var(--shadow-lg);
}

.form-message::before {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.form-message.success {
  background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
  color: #065f46;
  border: 2px solid #10b981;
  border-left: 4px solid #10b981;
}

.form-message.success::before {
  content: "✓";
  background: #10b981;
  color: white;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.form-message.error {
  background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
  color: #991b1b;
  border: 2px solid #ef4444;
  border-left: 4px solid #ef4444;
}

.form-message.error::before {
  content: "✕";
  background: #ef4444;
  color: white;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* === FAQ SECTION === */
.faq-section {
  padding: var(--spacing-2xl) 0;
}

.faq-container {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: white;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-weight: 600;
  font-size: 1rem;
  color: var(--gray-900);
  transition: background var(--transition-fast);
}

.faq-question:hover {
  background: var(--gray-50);
}

.faq-icon {
  font-size: 1.5rem;
  color: var(--primary);
  transition: transform var(--transition-base);
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow);
}

.faq-item.active .faq-answer {
  max-height: 1000px;
}

.faq-answer > div {
  padding: 0 var(--spacing-md) var(--spacing-md);
}

.faq-answer p {
  color: var(--gray-600);
  line-height: 1.6;
  margin-bottom: var(--spacing-sm);
}

.faq-answer ul {
  margin-left: var(--spacing-md);
}

.faq-answer li {
  color: var(--gray-700);
  margin-bottom: 0.5rem;
  position: relative;
  padding-left: var(--spacing-md);
}

.faq-answer li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: 700;
}

/* === FOOTER === */
.footer {
  background: var(--gray-900);
  color: white;
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-col h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-md);
}

.footer-col h4 {
  font-size: 1rem;
  margin-bottom: var(--spacing-md);
  color: var(--gray-300);
}

.footer-col p {
  color: var(--gray-400);
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
}

.footer-certifications {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.cert-badge-footer {
  padding: 0.25rem 0.75rem;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
}

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

.footer-col ul li a {
  color: var(--gray-400);
  transition: color var(--transition-fast);
}

.footer-col ul li a:hover {
  color: white;
}

.footer-bottom {
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--gray-800);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.footer-bottom p {
  color: var(--gray-400);
  font-size: 0.875rem;
}

.footer-links {
  display: flex;
  gap: var(--spacing-md);
}

.footer-links a {
  color: var(--gray-400);
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: white;
}

/* === BACK TO TOP BUTTON === */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 3rem;
  height: 3rem;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  z-index: 999;
}

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

.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-3px);
}

/* === RESPONSIVE === */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.5rem;
  }

  .hero-title .subtitle {
    font-size: 1.5rem;
  }

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

  .contact-info {
    position: static;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: var(--spacing-md);
    box-shadow: var(--shadow-lg);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
  }

  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-title .subtitle {
    font-size: 1.25rem;
  }

  .hero-cta {
    flex-direction: column;
  }

  .section-header h2 {
    font-size: 2rem;
  }

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

  .certifications-grid,
  .advantages-grid,
  .applications-grid {
    grid-template-columns: 1fr;
  }

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

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

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

  .trust-stats {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  :root {
    --spacing-2xl: 3rem;
    --spacing-xl: 2rem;
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .section-header h2 {
    font-size: 1.75rem;
  }

  .btn-lg {
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
  }
}

/* === ANIMATIONS === */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.8;
  }
}

.animate-in {
  animation: fadeInUp 0.6s ease-out;
}

/* Loading state for form submission */
.form-submitting {
  pointer-events: none;
  opacity: 0.7;
}

.form-submitting button[type="submit"] {
  position: relative;
}

.form-submitting button[type="submit"]::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  top: 50%;
  left: 50%;
  margin-left: -8px;
  margin-top: -8px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}