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

:root {
  --bg: #0a0a12;
  --fg: #ffffff;
  --accent: #f59e0b;
  --muted: rgba(255,255,255,0.45);
  --border: rgba(245,158,11,0.12);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'DM Sans', system-ui, sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: #0a0a12; }
::-webkit-scrollbar-thumb { background: rgba(245,158,11,0.3); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(245,158,11,0.5); }

::selection { background: rgba(245,158,11,0.25); color: #fff; }

a { color: inherit; }
img, video { max-width: 100%; height: auto; display: block; }
button { cursor: pointer; border: none; background: none; font: inherit; }
input, textarea, select { font: inherit; }

/* Utility */
.section-label {
  font-family: 'DM Sans', sans-serif;
  font-size: 0.7rem;
  font-weight: 600;
  color: #f59e0b;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 1rem;
  display: block;
}

.section-title {
  font-family: 'Syne', sans-serif;
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: #fff;
}

.section-header { margin-bottom: 3.5rem; }

/* Animation */
@media (prefers-reduced-motion: no-preference) {
  .sys-card, .port-card, .model-card, .vel-node {
    transition: transform 0.3s ease;
  }
}