:root{
  /* Colors */
  --bg: #0b0f14;            /* page background */
  --panel: #0f1418;         /* panels / cards */
  --muted: #95a0ab;         /* subtle text */
  --text: #e6eef6;          /* primary text */
  --accent: #37e0ff;        /* primary accent */
  --accent-2: #27c6ff;      /* secondary accent */

  /* Layout */
  --radius: 12px;           /* default corner radius */
  --header-h: 72px;         /* header height */
  --container: 1200px;      /* max content width */

  /* UI */
  --glass: rgba(255,255,255,0.03);

  /* Accessibility / motion */
  --transition-fast: .2s;
  --transition-base: .6s;
}

/* -------------------------
  Reset / base
  ------------------------- */
* { box-sizing: border-box; }
html, body { height: 100%; }
body{
  margin: 0;
  padding-top: var(--header-h); /* space for fixed header */
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Reduce motion */
@media (prefers-reduced-motion: reduce) {
  .reveal, .revealed, * { transition: none !important; animation: none !important; }
}

/* -------------------------
  Content helpers
  ------------------------- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* images & links */
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }

/* -------------------------
  Buttons (re-usable)
  - .btn is the base; modifier classes for variants
  ------------------------- */
.btn {
  display: inline-block;
  padding: 0.5rem 0.85rem;
  border-radius: 8px;
  text-decoration: none;
  border: 1px solid transparent;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  vertical-align: middle;
  transition: transform var(--transition-fast) ease, box-shadow var(--transition-fast) ease;
  -webkit-user-select: none;
  user-select: none;
}

/* Primary gradient button */
.btn-primary {
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
  color: #041019;
  border-color: transparent;
}

/* Secondary / ghost style */
.btn-secondary {
  background: transparent;
  color: var(--accent);
  border: 1px solid rgba(55,160,255,0.12);
}

/* Focus & hover affordances (keyboard & mouse) */
.btn:focus {
  outline: 3px solid rgba(55,224,255,0.14);
  outline-offset: 2px;
}
.btn:hover { transform: translateY(-1px); }

/* -------------------------
  Typography
  ------------------------- */
.section-title {
  color: var(--text);
  font-weight: 700;
  margin: 0 0 1rem;
}
.section-title .accent {
  color: var(--accent);
}

/* -------------------------
  Small utilities
  - reveal animation helpers used for entrance transitions
  ------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--transition-base) ease, transform var(--transition-base) ease;
}
.revealed {
  opacity: 1;
  transform: translateY(0);
}