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

body {
  font-family: 'Poppins', sans-serif;
  background-color: #f8fafc;
  color: #222;
  user-select: none;
  overflow-x: hidden;
}

/* Hero Section */
.hero {
  position: relative;
  height: 60vh;
  background: linear-gradient(120deg, #2563eb, #1d4ed8);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  text-align: center;
}

.overlay {
  position: absolute;
  width: 100%;
  height: 100%;
  background: rgba(37, 99, 235, 0.5);
  top: 0;
  left: 0;
}

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

.hero-content h1 {
  font-size: 3rem;
  margin-bottom: 10px;
  text-shadow: 0 3px 8px rgba(0,0,0,0.3);
}

.hero-content p {
  font-size: 1.1rem;
  margin-bottom: 20px;
}

.cta-btn {
  background: #fff;
  color: #2563eb;
  padding: 10px 25px;
  border-radius: 25px;
  text-decoration: none;
  font-weight: 600;
  transition: 0.3s;
}

.cta-btn:hover {
  background: #1d4ed8;
  color: white;
}

/* Ads */
.ads {
  margin: 30px auto;
  text-align: center;
}

.ad-box {
  background: #e5e7eb;
  width: 90%;
  max-width: 728px;
  height: 90px;
  line-height: 90px;
  border-radius: 10px;
  margin: auto;
  color: #555;
  font-weight: bold;
}

/* Courses Section */
.subjects {
  text-align: center;
  padding: 60px 20px;
}

.subjects h2 {
  font-size: 2rem;
  margin-bottom: 40px;
  color: #2563eb;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 25px;
  max-width: 1000px;
  margin: 0 auto;
}

.card {
  background: white;
  border-radius: 15px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  padding: 25px;
  transition: transform 0.3s, background 0.3s;
}

.card:hover {
  transform: translateY(-8px);
  background: #f0f8ff;
}

.card h3 {
  color: #1d4ed8;
  margin-bottom: 10px;
}

.card p {
  font-size: 0.95rem;
  color: #555;
  margin-bottom: 15px;
}

.view-btn {
  display: inline-block;
  background: #2563eb;
  color: #fff;
  text-decoration: none;
  padding: 8px 18px;
  border-radius: 20px;
  transition: 0.3s;
}

.view-btn:hover {
  background: #1e40af;
}

/* Footer */
footer {
  background: #2563eb;
  color: white;
  text-align: center;
  padding: 20px 0;
  font-size: 0.9rem;
  margin-top: 50px;
}

/* Watermark */
.watermark {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(-30deg);
  font-size: 5rem;
  color: rgba(0,0,0,0.05);
  pointer-events: none;
  user-select: none;
  z-index: 9999;
}

/* Responsive */
@media (max-width: 768px) {
  .hero-content h1 { font-size: 2.2rem; }
  .hero-content p { font-size: 1rem; }
  .watermark { font-size: 3rem; }
}
.small-hero {
  height: 40vh;
  background: linear-gradient(120deg, #1d4ed8, #2563eb);
}