:root {
  --primary: #0f172a;    /* Deep Slate for text/headings */
  --accent: #4f46e5;     /* Indigo Brand Color */
  --header-bg: #ffffff;  /* Pure White Header */
  --body-bg: #f0f7ff;    /* Light Sky Blue Body */
  --footer-bg: #000000;  /* Pure Black Footer */
  --white: #ffffff;
  --text-main: #1e293b;
  --text-muted: #64748b;
}

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

html, body {
  height: 100%;
  font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
  color: var(--text-main);
  /*line-height: 1.6;*/
}

body { 
  display: flex; 
  flex-direction: column; 
  background-color: var(--body-bg); 
}

/* 1. White Header */
header { 
  background: var(--header-bg); 
  padding: 1px 0; 
  border-bottom: 1px solid #e2e8f0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0,0,0,0.02);
}

nav {
  max-width: 1200px;
  margin: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 20px;
}

.logo-wrap img { 
  height: 42px; 
  display: block; 
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  margin-left: 25px;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-links a:hover { 
  color: var(--accent); 
}

/* 2. Light Blue Body Layout */
main { 
  flex: 1; 
  padding: 20px 20px; 
/*  max-width: 1100px; */
  margin: 0 auto; 
  width: 100%;
}

/* Content Cards that sit on the blue background */
.section-card {
  background: var(--white);
  padding: 40px;
  border-radius: 16px;
  box-shadow: 0 10px 25px -5px rgba(0, 50, 100, 0.05);
  margin-bottom: 30px;
  border: 1px solid rgba(226, 232, 240, 0.5);
}

h1 { font-size: 3rem; color: var(--primary); margin-bottom: 20px; letter-spacing: -0.02em; }
h2 { color: var(--primary); margin-bottom: 1.5rem; }

/* 3. Black Footer */
footer { 
  background: var(--footer-bg); 
  color: #94a3b8; /* Muted gray for black background */
  text-align: center;
  border-top: 1px solid #1e293b;
}

footer strong { 
  color: var(--white); 
  display: block;
  margin-bottom: 10px;
  font-size: 1.2rem;
}

footer p { font-size: 0.9rem; }

/* Buttons */
.btn {
  padding: 12px 24px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  display: inline-block;
  transition: transform 0.2s;
}

.btn-primary { 
  background: var(--accent); 
  color: white; 
}

.btn-primary:hover { 
  transform: translateY(-2px); 
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
  nav { flex-direction: column; gap: 15px; }
  .nav-links { margin-left: 0; display: flex; flex-wrap: wrap; justify-content: center; }
  .nav-links a { margin: 5px 10px; }
}

.highlight {
    color: var(--accent);
}