/* ===== Base ===== */
body {
  font-family: Arial, Helvetica, sans-serif;
  background: linear-gradient(135deg, #0f172a, #1e293b);
  color: #e2e8f0;
  margin: 0;
  padding: 0;
}

/* ===== Layout containers ===== */
header,
main {
  max-width: 900px;
  margin: 40px auto;
  padding: 0 20px;
}

/* ===== Navigation ===== */
nav {
  background-color: rgba(255,255,255,0.05);
  backdrop-filter: blur(8px);
  padding: 12px 16px;
  border-radius: 14px;
  text-align: center;
  margin-bottom: 20px;
  border: 1px solid rgba(255,255,255,0.08);
}

nav a {
  display: inline-block;
  margin: 0 8px;
  padding: 8px 14px;
  border-radius: 10px;
  font-weight: bold;
  text-decoration: none;
  color: #38bdf8; /* electric blue */
  transition: 0.3s ease;
}

nav a:hover {
  background-color: #38bdf8;
  color: #0f172a;
}

/* ===== Content card ===== */
article {
  background-color: rgba(255,255,255,0.05);
  padding: 28px;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.08);
  backdrop-filter: blur(10px);
}

/* ===== Headings ===== */
h1 {
  color: #ffffff;
  font-size: 2rem;
}

h2 {
  color: #38bdf8;
  margin-top: 28px;
  border-left: 4px solid #38bdf8;
  padding-left: 10px;
}

h3 {
  color: #cbd5e1;
}

/* ===== Text ===== */
p {
  line-height: 1.7;
  color: #e2e8f0;
}

/* ===== Images ===== */
img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 20px 0;
  border-radius: 12px;
}

/* ===== Lists ===== */
ul, ol {
  padding-left: 22px;
}

li {
  margin-bottom: 8px;
}

/* ===== Footer ===== */
footer {
  text-align: center;
  margin: 40px 0;
  color: #94a3b8;
}