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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
  color: #fff;
  background: #050d1a;
  overflow-x: hidden;
}

/* Starfield background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(1px 1px at 10% 20%, rgba(255,255,255,0.8), transparent),
    radial-gradient(1px 1px at 25% 50%, rgba(255,255,255,0.6), transparent),
    radial-gradient(1px 1px at 40% 15%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1px 1px at 55% 70%, rgba(255,255,255,0.7), transparent),
    radial-gradient(1px 1px at 70% 35%, rgba(255,255,255,0.4), transparent),
    radial-gradient(1px 1px at 85% 60%, rgba(255,255,255,0.6), transparent),
    radial-gradient(1px 1px at 15% 80%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1px 1px at 60% 90%, rgba(255,255,255,0.3), transparent),
    radial-gradient(1px 1px at 90% 10%, rgba(255,255,255,0.6), transparent),
    radial-gradient(1px 1px at 5% 45%, rgba(255,255,255,0.4), transparent),
    radial-gradient(1px 1px at 30% 95%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1px 1px at 75% 85%, rgba(255,255,255,0.3), transparent),
    radial-gradient(1px 1px at 50% 40%, rgba(255,255,255,0.6), transparent),
    radial-gradient(1px 1px at 20% 65%, rgba(255,255,255,0.4), transparent),
    radial-gradient(1px 1px at 95% 45%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1.5px 1.5px at 33% 30%, rgba(255,255,255,0.7), transparent),
    radial-gradient(1.5px 1.5px at 66% 55%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1.5px 1.5px at 80% 20%, rgba(255,255,255,0.6), transparent),
    radial-gradient(1.5px 1.5px at 45% 75%, rgba(255,255,255,0.4), transparent),
    radial-gradient(1.5px 1.5px at 12% 55%, rgba(255,255,255,0.5), transparent);
  pointer-events: none;
  z-index: 0;
}

/* ---- Header ---- */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 48px;
  background: rgba(5, 13, 26, 0.7);
  backdrop-filter: blur(12px);
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 22px;
  font-weight: 700;
  text-decoration: none;
  color: #fff;
}

.logo svg {
  width: 28px;
  height: 28px;
}

.logo > span {
  color: #fff;
}

.logo > span > span {
  color: #3b9eff;
}

nav {
  display: flex;
  align-items: center;
  gap: 36px;
}

nav a {
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  font-size: 15px;
  transition: color 0.2s;
}

nav a:hover {
  color: #fff;
}

nav a.active {
  color: #3b9eff;
}

.btn {
  display: inline-block;
  padding: 10px 28px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  border: none;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(135deg, #1a6dff, #3b9eff);
  color: #fff;
  box-shadow: 0 4px 20px rgba(59, 158, 255, 0.35);
}

.btn-primary:hover {
  box-shadow: 0 6px 28px rgba(59, 158, 255, 0.5);
}

.btn-hero {
  padding: 16px 48px;
  font-size: 18px;
  background: linear-gradient(135deg, #1a6dff, #4db8ff);
  box-shadow: 0 0 30px rgba(59, 158, 255, 0.4), inset 0 1px 0 rgba(255,255,255,0.2);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(59, 158, 255, 0.5);
  box-shadow: 0 0 15px rgba(59, 158, 255, 0.1);
}

.btn-outline:hover {
  background: rgba(59, 158, 255, 0.1);
  box-shadow: 0 0 25px rgba(59, 158, 255, 0.2);
}

/* ---- Page header (sub-pages) ---- */
.page-header {
  position: relative;
  padding: 160px 24px 80px;
  text-align: center;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(59, 158, 255, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.page-header h1 {
  font-size: 48px;
  font-weight: 800;
  margin-bottom: 16px;
  position: relative;
}

.page-header h1 span {
  color: #3b9eff;
}

.page-header p {
  font-size: 18px;
  color: rgba(255,255,255,0.6);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.6;
  position: relative;
}

/* ---- Cards ---- */
.card {
  background: linear-gradient(180deg, rgba(15, 40, 80, 0.6), rgba(8, 20, 50, 0.8));
  border: 1px solid rgba(59, 158, 255, 0.15);
  border-radius: 16px;
  padding: 36px 28px 32px;
  transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 40px rgba(59, 158, 255, 0.15);
}

.card-icon {
  width: 64px;
  height: 64px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(20, 50, 100, 0.8), rgba(10, 30, 70, 0.9));
  border: 1px solid rgba(59, 158, 255, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 20px rgba(59, 158, 255, 0.15);
  margin-bottom: 20px;
}

.card-icon svg {
  width: 32px;
  height: 32px;
  color: #4db8ff;
}

.card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
}

.card h3 span {
  color: #3b9eff;
}

.card p {
  font-size: 15px;
  color: rgba(255,255,255,0.6);
  line-height: 1.6;
}

.card-divider {
  height: 2px;
  margin-top: 20px;
  background: linear-gradient(90deg, transparent, rgba(59, 158, 255, 0.4), transparent);
  border-radius: 1px;
}

/* ---- Sections ---- */
.section {
  position: relative;
  z-index: 1;
  padding: 80px 24px;
  max-width: 1100px;
  margin: 0 auto;
}

.section-title {
  font-size: 36px;
  font-weight: 800;
  text-align: center;
  margin-bottom: 48px;
}

.section-title span {
  color: #3b9eff;
}

/* ---- Glow divider ---- */
.glow-divider {
  height: 1px;
  max-width: 600px;
  margin: 0 auto;
  background: linear-gradient(90deg, transparent, rgba(59, 158, 255, 0.4), transparent);
}

/* ---- Footer ---- */
footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 40px 24px;
  color: rgba(255,255,255,0.4);
  font-size: 14px;
  background: #050d1a;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
  header {
    padding: 14px 20px;
  }

  nav {
    gap: 16px;
  }

  nav a:not(.btn) {
    display: none;
  }

  .page-header {
    padding: 120px 20px 60px;
  }

  .page-header h1 {
    font-size: 32px;
  }

  .page-header p {
    font-size: 16px;
  }

  .section {
    padding: 60px 20px;
  }

  .section-title {
    font-size: 26px;
  }
}