/* ================= ROOT COLORS ================= */
:root {
  --primary: #0f1f3d;   /* Dark Blue */
  --secondary: #ffffff; /* White */
  --accent: #1e293b;    /* Dark Text */
  --light: #f8fafc;     /* Light Background */
  --border: #e5e7eb;
}

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

/* ================= BODY ================= */
body {
  font-family: Arial, sans-serif;
  background: var(--light);
  color: var(--accent);
  line-height: 1.7;
}

/* ================= ARTICLE WRAPPER ================= */
article {
  max-width: 1100px;
  margin: 40px auto;
  background: var(--secondary);
  padding: 40px;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

/* ================= HEADINGS ================= */
h1 {
  font-size: 36px;
  color: var(--primary);
  margin-bottom: 20px;
  line-height: 1.3;
}

h2 {
  font-size: 26px;
  color: var(--primary);
  margin-top: 30px;
  margin-bottom: 15px;
}

h3 {
  font-size: 20px;
  color: var(--accent);
  margin-bottom: 10px;
}

/* ================= PARAGRAPHS ================= */
p {
  font-size: 16px;
  margin-bottom: 15px;
  color: var(--accent);
}

/* ================= LINKS ================= */
a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
}

a:hover {
  text-decoration: underline;
}

/* ================= BUTTON ================= */
.btn {
  display: inline-block;
  background: var(--primary);
  color: var(--secondary);
  padding: 12px 20px;
  border-radius: 6px;
  margin-top: 15px;
  transition: 0.3s;
  font-weight: bold;
}

.btn:hover {
  background: var(--accent);
}

/* ================= SECTION BACKGROUND (NEW IMPROVEMENT) ================= */
section {
  background: var(--secondary);
  margin: 20px 0;
  padding: 25px;
  border-radius: 10px;
  border: 1px solid var(--border);
  transition: 0.3s;
}

/* hover effect for better UI */
section:hover {
  box-shadow: 0 6px 20px rgba(0,0,0,0.08);
  transform: translateY(-2px);
}

/* ================= HR DIVIDER ================= */
hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 30px 0;
}

/* ================= RESPONSIVE DESIGN ================= */
@media (max-width: 992px) {
  article {
    margin: 20px;
    padding: 25px;
  }

  h1 {
    font-size: 30px;
  }

  h2 {
    font-size: 22px;
  }
}

@media (max-width: 600px) {
  body {
    font-size: 15px;
  }

  article {
    padding: 18px;
  }

  h1 {
    font-size: 24px;
  }

  h2 {
    font-size: 20px;
  }

  .btn {
    width: 100%;
    text-align: center;
  }
}