/* ---- GLOBAL RESET ---- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", sans-serif;
}

body {
  min-height: 100vh;
  background: radial-gradient(circle at top, #0f172a, #020617);
  color: #f8fafc;
}

html, body {
  min-height: 100%;
}

main {
  min-height: calc(100vh - 140px); /* header + footer space */
}

/* ---- NAVBAR ---- */
nav {
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(10px);
  padding: 15px 40px;
  display: flex;
  justify-content: center;
  gap: 25px;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 15px rgba(0, 0, 0, 0.4);
}

nav a {
  color: #e2e8f0;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  transition: all 0.3s ease;
}

nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 2px;
  background: #00b4d8;
  transition: width 0.3s ease;
}

nav a:hover::after,
nav a.active::after {
  width: 100%;
}

nav a:hover,
nav a.active {
  color: #48cae4;
}

/* ---- FOOTER ---- */
footer {
  background: transparent;
  border-top: 1px solid rgba(72, 202, 228, 0.15);
  color: #94a3b8;
  text-align: center;
  padding: 25px 20px;
  font-size: 0.9rem;
}