:root {
  --bg-primary: #0a0f1d;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-hover: rgba(31, 41, 55, 0.85);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-accent: rgba(255, 145, 77, 0.35);
  --text-main: #f9fafb;
  --text-muted: #9ca3af;
  --text-dim: #6b7280;
  --accent-orange: #ff914d;
  --accent-orange-hover: #ff7a29;
  --accent-orange-glow: rgba(255, 145, 77, 0.25);
  --accent-cyan: #06b6d4;
  --accent-green: #10b981;
  --accent-red: #ef4444;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background: radial-gradient(circle at 50% 0%, rgba(255, 145, 77, 0.07) 0%, transparent 60%),
              radial-gradient(circle at 100% 50%, rgba(6, 182, 212, 0.04) 0%, transparent 50%),
              var(--bg-primary);
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s ease;
}

p {
  color: var(--text-muted);
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header & Nav */
header.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(10, 15, 29, 0.9);
  border-bottom: 1px solid var(--border-subtle);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
  width: 100%;
  max-width: 1300px;
  margin: 0 auto;
  padding: 0 2rem;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  margin-right: 2.5rem;
}

.brand-logo img {
  height: 44px;
  width: auto;
  max-width: 160px;
  object-fit: contain;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-muted);
  position: relative;
  padding: 0.5rem 0;
  white-space: nowrap;
}

.nav-link:hover, .nav-link.active {
  color: #ffffff;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--accent-orange);
  border-radius: 2px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-shrink: 0;
  margin-left: 2rem;
  padding-left: 1.5rem;
  border-left: 1px solid var(--border-subtle);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent-orange);
  color: #0b0f19;
  box-shadow: 0 4px 14px var(--accent-orange-glow);
}

.btn-primary:hover {
  background: var(--accent-orange-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 145, 77, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--text-main);
  border-color: var(--border-subtle);
}

.btn-outline:hover {
  border-color: var(--accent-orange);
  color: var(--accent-orange);
  background: rgba(255, 145, 77, 0.05);
}

.btn-subtle {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border-color: rgba(255, 255, 255, 0.1);
}

.btn-subtle:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.badge-orange {
  background: rgba(255, 145, 77, 0.12);
  color: var(--accent-orange);
  border: 1px solid rgba(255, 145, 77, 0.3);
}

.badge-cyan {
  background: rgba(6, 182, 212, 0.12);
  color: var(--accent-cyan);
  border: 1px solid rgba(6, 182, 212, 0.3);
}

/* Sections */
section {
  padding: 5rem 0;
  position: relative;
}

.section-hero {
  padding: 6rem 0 5rem 0;
}

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

.section-header .badge {
  margin-bottom: 1rem;
}

.section-header h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.section-header p {
  font-size: 1.15rem;
  line-height: 1.6;
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.75rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  padding: 2rem;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.card:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: rgba(255, 145, 77, 0.1);
  color: var(--accent-orange);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
}

.card h3 {
  font-size: 1.35rem;
  margin-bottom: 0.75rem;
}

.card p {
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Stats Ribbon */
.stats-strip {
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(17, 24, 39, 0.4);
  padding: 2.5rem 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  text-align: center;
}

.stat-item h4 {
  font-size: 2.75rem;
  color: var(--accent-orange);
  font-weight: 800;
  line-height: 1;
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
}

.stat-item p {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
}

/* Simulation Console Mockup */
.sim-console {
  background: #0d1322;
  border: 1px solid rgba(255, 145, 77, 0.25);
  border-radius: 16px;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.6), 0 0 40px rgba(255, 145, 77, 0.08);
  overflow: hidden;
  margin-top: 2rem;
}

.sim-topbar {
  background: #151d30;
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.sim-dots {
  display: flex;
  gap: 6px;
}

.sim-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.sim-dot.red { background: #ef4444; }
.sim-dot.yellow { background: #f59e0b; }
.sim-dot.green { background: #10b981; }

.sim-body {
  padding: 1.5rem;
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 1.5rem;
}

.sim-sidebar {
  background: rgba(10, 15, 29, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  padding: 1rem;
}

.sim-main {
  background: rgba(10, 15, 29, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* Footer */
footer.site-footer {
  margin-top: auto;
  background: #080c16;
  border-top: 1px solid var(--border-subtle);
  padding: 4rem 0 2rem 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-col h4 {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-main);
  margin-bottom: 1.25rem;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-col a {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-col a:hover {
  color: var(--accent-orange);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* Mobile Nav Toggle */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.75rem;
  cursor: pointer;
}

/* Responsive */
@media (max-width: 1200px) and (min-width: 769px) {
  .nav-container {
    padding: 0 1.25rem;
  }
  .brand-logo {
    margin-right: 1.5rem;
  }
  .nav-links {
    gap: 1.15rem;
  }
  .nav-link {
    font-size: 0.86rem;
  }
  .nav-actions {
    margin-left: 1.25rem;
    padding-left: 1rem;
  }
}

@media (max-width: 992px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
  .sim-body {
    grid-template-columns: 1fr;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
}

@media (max-width: 768px) {
  .mobile-toggle {
    display: block;
  }
  .nav-links {
    display: none;
    position: absolute;
    top: 80px;
    left: 0;
    width: 100%;
    background: #0a0f1d;
    flex-direction: column;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-subtle);
    gap: 1.25rem;
  }
  .nav-links.active {
    display: flex;
  }
  .nav-actions {
    display: none;
  }
  .section-hero {
    padding: 4rem 0 3rem 0;
  }
  .section-header h2 {
    font-size: 1.85rem;
  }
  .stats-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}