/* MTA TECHNOLOGIES - Official Design System */
:root {
  --bg-primary: #070B14;
  --bg-surface: #0B1120;
  --bg-card: #0E1629;
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(56, 189, 248, 0.4);
  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --accent-blue: #38BDF8;
  --accent-cobalt: #2563EB;
  --accent-emerald: #10B981;
  --accent-glow: rgba(56, 189, 248, 0.15);
  --container-max: 1200px;
}

[data-theme="light"] {
  --bg-primary: #F8FAFC;
  --bg-surface: #FFFFFF;
  --bg-card: #F1F5F9;
  --border-color: #E2E8F0;
  --border-hover: #38BDF8;
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #94A3B8;
  --accent-blue: #0284C7;
  --accent-cobalt: #1D4ED8;
  --accent-emerald: #059669;
  --accent-glow: rgba(2, 132, 199, 0.1);
}

/* Bilingual switching rules */
html[lang="ar"] .en-only {
  display: none !important;
}
html[lang="en"] .ar-only {
  display: none !important;
}

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

html {
  scroll-behavior: smooth;
  font-family: 'Alexandria', 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
}

html[lang="en"] {
  font-family: 'Plus Jakarta Sans', 'Alexandria', system-ui, -apple-system, sans-serif;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* Header & Navigation */
header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(7, 11, 20, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
}
[data-theme="light"] header {
  background-color: rgba(255, 255, 255, 0.92);
}

.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}

.brand-logo-img {
  height: 42px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 600;
  transition: color 0.2s ease;
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent-blue);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-blue);
  border-radius: 2px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  border-radius: 0.75rem;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent-cobalt);
  color: #FFFFFF;
  box-shadow: 0 4px 14px var(--accent-glow);
}
.btn-primary:hover {
  background: var(--accent-blue);
  color: #FFFFFF;
}

.btn-outline {
  background: transparent;
  border-color: var(--border-color);
  color: var(--text-primary);
}
.btn-outline:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--accent-blue);
}

.control-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.5rem 0.85rem;
  border-radius: 0.5rem;
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 600;
  transition: border-color 0.2s ease;
}
.control-btn:hover {
  border-color: var(--accent-blue);
}

/* Hero Section */
.hero-section {
  padding: 5rem 0 4rem;
  text-align: center;
}
.hero-tag {
  display: inline-block;
  padding: 0.35rem 0.95rem;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: var(--accent-blue);
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: 2.75rem;
  font-weight: 900;
  line-height: 1.25;
  margin-bottom: 1.25rem;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}
.highlight-text {
  background: linear-gradient(135deg, #38BDF8, #2563EB);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 750px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 2rem;
}

/* Grids & Cards */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}
.grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
}

.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 1.25rem;
  padding: 2rem;
  transition: all 0.2s ease;
}
.card:hover {
  border-color: var(--border-hover);
}

.badge-kicker {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent-blue);
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}

/* Footer */
footer {
  margin-top: auto;
  background: #050811;
  border-top: 1px solid var(--border-color);
  padding: 4rem 0 2rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2.5rem;
}
.footer-bottom {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 1rem;
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-title { font-size: 1.85rem; }
  .nav-bar { height: 70px; }
}

/* Lightbox Modal */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
}
.lightbox-content {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 1.5rem;
  max-width: 750px;
  width: 100%;
  padding: 2rem;
  position: relative;
}
.lightbox-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 1.75rem;
  cursor: pointer;
}
html[lang="en"] .lightbox-close {
  right: 1rem;
  left: auto;
}


/* Official MTA TECHNOLOGIES homepage identity */
.hero-brand {
  display: flex;
  justify-content: center;
  align-items: center;
  width: min(100%, 560px);
  margin: 0 auto 1.5rem;
}
.hero-brand img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 275px;
  object-fit: contain;
}
@media (max-width: 600px) {
  .hero-brand {
    width: min(100%, 440px);
    margin-bottom: 1.1rem;
  }
  .hero-brand img {
    max-height: 210px;
  }
}