@import url('https://fonts.googleapis.com/css2?family=Exo+2:wght@400;600;700&display=swap');

:root {
  --aero-blue: #00c4ff;
  --aero-glow: #66ffff;
  --aero-dark: #0b003d;
}

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

body {
  font-family: 'Exo 2', sans-serif;
  color: white;
  background: var(--aero-dark);
  min-height: 100vh;
  overflow-x: hidden;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 3rem;
  backdrop-filter: blur(20px);
  background: rgba(255, 255, 255, 0.05);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.logo {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--aero-glow);
}

nav a {
  margin-left: 1.5rem;
  text-decoration: none;
  color: #fff;
  transition: 0.3s;
}

nav a:hover { color: var(--aero-blue); text-shadow: 0 0 10px var(--aero-blue); }

.theme-toggle {
  margin-left: 1rem;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.2);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 50px;
  cursor: pointer;
  transition: 0.3s;
}
.theme-toggle:hover { background: rgba(0,200,255,0.2); color: var(--aero-blue); }

.hero {
  position: relative;
  height: 80vh;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  text-align: center;
}

.hero canvas {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero-content h1 { font-size: 3rem; line-height: 1.2; }
.hero-content span { color: var(--aero-blue); text-shadow: 0 0 15px var(--aero-glow); }
.hero-content p { margin-top: 1rem; opacity: 0.85; }
.btn { margin-top: 2rem; padding: 0.8rem 1.8rem; background: var(--aero-blue); color: #fff; border-radius: 50px; text-decoration: none; font-weight: 600; transition: 0.4s; box-shadow: 0 0 15px var(--aero-glow); }
.btn:hover { background: var(--aero-glow); color: #000; }

.sections-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  padding: 4rem 8%;
}

.grid-card {
  background: rgba(255, 255, 255, 0.05);
  border-radius: 1.5rem;
  padding: 2rem;
  text-align: center;
  color: #fff;
  text-decoration: none;
  transition: 0.4s;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.1);
}

.grid-card:hover { transform: translateY(-5px); border-color: var(--aero-blue); box-shadow: 0 0 20px rgba(0,200,255,0.3); }

footer { text-align:center; padding:2rem 0; background: rgba(255,255,255,0.05); font-size:0.9rem; }

/* Light theme toggle */
body.light { background: linear-gradient(160deg,#e0f7ff,#cce0ff,#d9e6ff); color:#000; }
body.light .grid-card { background: rgba(255,255,255,0.15); color: #000; border: 1px solid rgba(0,0,0,0.1); }
body.light .btn { background: #00c4ff; color: #fff; }
body.light nav a:hover { color:#000; }