:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --color-brand-50: #e3f2f7;
  --color-brand-100: #dceff7;
  --color-brand-600: #1f6c8c;
  --color-brand-700: #16556f;

  --color-teal-600: #207c71;

  --color-slate-50: #edf6f8;
  --color-slate-100: #e2f0f4;
  --color-slate-200: #d1e5eb;
  --color-slate-300: #b8d1da;
  --color-slate-400: #8faab6;
  --color-slate-500: #6d8692;
  --color-slate-600: #536874;
  --color-slate-700: #3b4e59;
  --color-slate-800: #273843;
  --color-slate-900: #1a2831;
  --color-slate-950: #10181f;

  --color-exercise: #dc2626;
  --color-exercise-text: #ffffff;

  --shadow-sm:
    0 2px 4px rgba(16, 24, 32, 0.04);

  --shadow-md:
    0 8px 20px rgba(16, 24, 32, 0.06),
    0 2px 4px rgba(16, 24, 32, 0.04);

  --shadow-lg:
    0 16px 36px rgba(16, 24, 32, 0.08),
    0 4px 10px rgba(16, 24, 32, 0.04);

  --shadow-xl:
    0 24px 50px rgba(16, 24, 32, 0.12),
    0 8px 16px rgba(16, 24, 32, 0.06);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  --container-max-width: 1200px;
}

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-slate-800);
  scroll-behavior: smooth;

  background:
    linear-gradient(
      180deg,
      #f4f9fb 0%,
      #edf5f8 100%
    );
}

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

  background:
    radial-gradient(
      circle at top right,
      rgba(44, 125, 160, 0.08),
      transparent 30%
    ),
    radial-gradient(
      circle at bottom left,
      rgba(42, 157, 143, 0.06),
      transparent 35%
    );
}

/* Exercise Banner Top and Bottom */
.exercise-banner-top {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  background-color: var(--color-exercise);
  color: var(--color-exercise-text);
  font-weight: 800;
  font-size: 0.875rem;
  letter-spacing: 0.12em;
  text-align: center;
  padding: 0.5rem 1rem;
  z-index: 1000;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

.exercise-banner-bottom {
  background-color: var(--color-exercise);
  color: var(--color-exercise-text);
  font-weight: 800;
  font-size: 0.875rem;
  letter-spacing: 0.12em;
  text-align: center;
  padding: 0.625rem 1rem;
  width: 100%;
}

/* Header & Navigation */
.site-header {
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-slate-200);
  position: sticky;
  top: 36px;
  z-index: 900;
}

.nav-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--color-slate-900);
}

.brand-logo-img {
  height: 120px;
  width: auto;
  max-width: 220px;
  object-fit: contain;
  display: block;
}

.footer-brand .brand-logo-img {
  height: 36px;
  filter: brightness(0) invert(1);
}

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

.brand-name {
  font-size: 1.125rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-slate-900);
}

.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 2rem;
}

.nav-link {
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-slate-600);
  transition: color 0.15s ease;
}

.nav-link:hover, .nav-link:focus, .nav-link.active {
  color: var(--color-brand-600);
}

.nav-link.active {
  font-weight: 700;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--color-slate-700);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.15s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background-color: var(--color-brand-600);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background-color: var(--color-brand-700);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: #ffffff;
  color: var(--color-slate-700);
  border-color: var(--color-slate-300);
}

.btn-secondary:hover {
  background-color: var(--color-slate-100);
  border-color: var(--color-slate-400);
}

.btn-lg {
  padding: 0.875rem 1.75rem;
  font-size: 1rem;
}

/* Layout & Containers */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 5rem 0;
}

.section-alt {
  background-color: #ffffff;
}

.section-dark {
  background-color: var(--color-slate-900);
  color: #ffffff;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 3.5rem auto;
}

.section-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.25rem 0.75rem;
  background-color: var(--color-brand-100);
  color: var(--color-brand-700);
  border-radius: var(--radius-full);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-slate-900);
  margin-bottom: 1rem;
  line-height: 1.2;
}

.section-dark .section-title {
  color: #ffffff;
}

.section-description {
  font-size: 1.125rem;
  color: var(--color-slate-600);
  line-height: 1.6;
}

.section-dark .section-description {
  color: var(--color-slate-300);
}

/* Hero Section */
.hero-section {
  padding: 4rem 0 5rem 0;
  background: radial-gradient(circle at 80% 20%, #e0f2fe 0%, #f8fafc 60%);
  border-bottom: 1px solid var(--color-slate-200);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: #ffffff;
  border: 1px solid var(--color-brand-100);
  padding: 0.375rem 0.875rem;
  border-radius: var(--radius-full);
  width: fit-content;
  box-shadow: var(--shadow-sm);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-brand-700);
}

.hero-badge-pill {
  background-color: var(--color-brand-600);
  color: #ffffff;
  font-size: 0.6875rem;
  font-weight: 700;
  padding: 0.125rem 0.5rem;
  border-radius: var(--radius-full);
}

.hero-title {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.04em;
  color: var(--color-slate-900);
}

.hero-highlight {
  color: var(--color-brand-600);
  background: linear-gradient(135deg, var(--color-brand-600), var(--color-teal-600));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.1875rem;
  color: var(--color-slate-600);
  line-height: 1.6;
}

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

.hero-trust {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 0.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-slate-200);
}

.trust-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-slate-400);
}

.trust-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  color: var(--color-slate-600);
  font-size: 0.875rem;
  font-weight: 600;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.product-screenshot {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--color-slate-200);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
}

/* Feature Grid */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.5rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.feature-card {
  background-color: #ffffff;
  border: 1px solid var(--color-slate-200);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-brand-100);
}

.feature-icon-wrapper {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background-color: var(--color-brand-50);
  color: var(--color-brand-600);
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-slate-900);
}

.feature-text {
  font-size: 0.9375rem;
  color: var(--color-slate-600);
  line-height: 1.6;
}

.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid var(--color-slate-100);
}

.feature-list-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-slate-700);
  font-weight: 500;
}

.check-icon {
  color: var(--color-teal-600);
  flex-shrink: 0;
}

/* Solutions Section Tabs / Cards */
.solution-card {
  background-color: var(--color-slate-50);
  border: 1px solid var(--color-slate-200);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.solution-sector {
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-brand-600);
}

.solution-heading {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-slate-900);
}

.solution-body {
  font-size: 1rem;
  color: var(--color-slate-600);
  line-height: 1.6;
}

.solution-specs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  background-color: #ffffff;
  padding: 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-slate-200);
}

.spec-item {
  display: flex;
  flex-direction: column;
}

.spec-number {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-brand-700);
  font-family: var(--font-mono);
}

.spec-label {
  font-size: 0.75rem;
  color: var(--color-slate-500);
}

/* Technical Architecture & SCADA Integration */
.arch-card {
  background-color: var(--color-slate-800);
  border: 1px solid var(--color-slate-700);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.arch-card h4 {
  font-size: 1.125rem;
  font-weight: 700;
  color: #ffffff;
}

.arch-card p {
  font-size: 0.875rem;
  color: var(--color-slate-300);
  line-height: 1.5;
}

.protocol-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  margin-top: 0.5rem;
}

.protocol-tag {
  background-color: var(--color-slate-900);
  border: 1px solid var(--color-slate-700);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.6875rem;
  font-family: var(--font-mono);
  color: var(--color-brand-100);
}

/* Security & Compliance */
.compliance-banner {
  background: linear-gradient(135deg, var(--color-slate-900), #1e293b);
  border: 1px solid var(--color-slate-700);
  border-radius: var(--radius-xl);
  padding: 3rem;
  color: #ffffff;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3rem;
  align-items: center;
}

.compliance-info h3 {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.compliance-info p {
  font-size: 1rem;
  color: var(--color-slate-300);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.security-checklist {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.security-check-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9375rem;
  color: var(--color-slate-200);
}

.security-badge-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.badge-card {
  background-color: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 1.25rem;
  border-radius: var(--radius-lg);
  text-align: center;
}

.badge-card strong {
  display: block;
  font-size: 1.125rem;
  color: #ffffff;
  margin-bottom: 0.25rem;
}

.badge-card span {
  font-size: 0.75rem;
  color: var(--color-slate-400);
}

/* Case Studies */
.case-study-card {
  background-color: #ffffff;
  border: 1px solid var(--color-slate-200);
  border-radius: var(--radius-xl);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.case-study-content {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.case-study-client {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-brand-600);
}

.case-study-quote {
  font-size: 1.0625rem;
  font-style: italic;
  color: var(--color-slate-700);
  line-height: 1.6;
}

.case-study-metrics {
  background-color: var(--color-slate-50);
  border-top: 1px solid var(--color-slate-200);
  padding: 1.25rem 2rem;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

/* Footer */
.site-footer {
  background-color: var(--color-slate-950);
  color: var(--color-slate-400);
  padding: 4rem 0 2rem 0;
  border-top: 1px solid var(--color-slate-800);
}

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

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 560px;
}

.footer-brand .brand-name {
  color: #ffffff;
}

.footer-desc {
  font-size: 0.875rem;
  line-height: 1.6;
  max-width: 320px;
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--color-slate-800);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8125rem;
  gap: 1rem;
}

/* Page Header for Interior Pages */
.page-header {
  padding: 4rem 0 3rem 0;
  background: radial-gradient(circle at 80% 20%, #e0f2fe 0%, #f8fafc 60%);
  border-bottom: 1px solid var(--color-slate-200);
  text-align: center;
}

.page-header-content {
  max-width: 800px;
  margin: 0 auto;
}

/* Resource Cards */
.resource-card {
  background-color: #ffffff;
  border: 1px solid var(--color-slate-200);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.resource-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-brand-100);
}

.resource-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-slate-400);
}

.resource-category {
  color: var(--color-brand-600);
  background-color: var(--color-brand-50);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
}

.resource-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-slate-900);
  line-height: 1.35;
}

.resource-excerpt {
  font-size: 0.9375rem;
  color: var(--color-slate-600);
  line-height: 1.6;
}

/* Value / Stat Cards for About */
.value-card {
  background-color: #ffffff;
  border: 1px solid var(--color-slate-200);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.value-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-slate-900);
}

.value-card p {
  font-size: 0.9375rem;
  color: var(--color-slate-600);
  line-height: 1.6;
}

/* Responsive Breakpoints */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .compliance-banner {
    grid-template-columns: 1fr;
    padding: 2rem;
  }
  
}

@media (max-width: 768px) {
  .site-header {
    top: 32px;
  }
  
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: #ffffff;
    flex-direction: column;
    padding: 1.5rem;
    gap: 1rem;
    border-bottom: 1px solid var(--color-slate-200);
    box-shadow: var(--shadow-lg);
  }
  
  .nav-menu.is-active {
    display: flex;
  }
  
  .mobile-toggle {
    display: block;
  }
  
  .hero-title {
    font-size: 2.25rem;
  }
  
  .grid-3, .grid-2, .grid-4 {
    grid-template-columns: 1fr;
  }
  
}