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

body {
  background: #f2f5f9;
  color: #333;
  line-height: 1.8;
}

/* HERO */
.hero {
  background: linear-gradient(120deg, #1e3c72, #2a5298);
  color: #fff;
  padding: 60px 20px;
  text-align: center;
}

.hero h1 {
  font-size: 2.6rem;
  margin-bottom: 15px;
}

.hero p {
  max-width: 750px;
  margin: auto;
  font-size: 1.1rem;
  opacity: 0.95;
}

/* CONTAINER */
.container {
  max-width: 1100px;
  margin: 40px auto;
  padding: 0 20px;
}

/* INTRO */
.intro {
  background: #ffffff;
  padding: 30px;
  border-radius: 14px;
  margin-bottom: 35px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.08);
}

/* CARD */
.card {
  background: #ffffff;
  padding: 30px;
  border-radius: 14px;
  margin-bottom: 35px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.08);
}

.card h2 {
  color: #1e3c72;
  margin-bottom: 15px;
}

.card h3 {
  margin-top: 20px;
  color: #2a5298;
}

.card ul {
  margin-top: 10px;
  padding-left: 20px;
}

.card ul li {
  margin-bottom: 8px;
}

/* GRID */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.box {
  background: #f8fbff;
  padding: 20px;
  border-radius: 12px;
  border-left: 5px solid #2a5298;
}

/* EXAMS */
.exam-list {
  columns: 2;
}

/* TIPS */
.tips {
  background: #eef4ff;
  border-left: 6px solid #1e3c72;
}

/* FOOTER */
.footer {
  background: #1e3c72;
  color: #fff;
  text-align: center;
  padding: 15px;
  font-size: 0.9rem;
}

/* MOBILE */
@media (max-width: 600px) {
  .hero h1 {
    font-size: 1.8rem;
  }

  .exam-list {
    columns: 1;
  }
}
/* Fade-in animation */
.hidden {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s ease;
}

.show {
  opacity: 1;
  transform: translateY(0);
}

/* Back to top button */
.back-to-top {
  position: fixed;
  bottom: 25px;
  right: 25px;
  background: #2a5298;
  color: #fff;
  border: none;
  padding: 12px 15px;
  border-radius: 50%;
  font-size: 18px;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s ease;
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover {
  background: #1e3c72;
}
.quiz-btn-wrapper {
  text-align: center;
  margin: 50px 0;
}

.quiz-link-btn {
  display: inline-block;
  padding: 15px 35px;
  font-size: 1.1rem;
  font-weight: 600;
  text-decoration: none;
  color: #fff;
  background: linear-gradient(120deg, #2a5298, #1e3c72);
  border-radius: 30px;
  transition: all 0.3s ease;
}

.quiz-link-btn:hover {
  transform: scale(1.06);
  box-shadow: 0 12px 30px rgba(0,0,0,0.25);
}