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

.s1-page {
  background: #f4f6fb;
  min-height: 100vh;
}

/* HEADER */
.s1-header {
  background: linear-gradient(135deg, #0a1f44, #102d66);
  color: #fff;
  padding: 50px 20px;
  text-align: center;
}

.s1-header h1 {
  font-size: 2.4rem;
  margin-bottom: 8px;
}

/* SEARCH */
.search-box {
  max-width: 600px;
  margin: 30px auto;
  padding: 0 20px;
}

.search-box input {
  width: 100%;
  padding: 14px 16px;
  font-size: 1rem;
  border-radius: 8px;
  border: 1px solid #cfd6e0;
}

/* SECTIONS */
.course-section {
  max-width: 900px;
  margin: 40px auto;
  padding: 0 20px;
}

.course-section h2 {
  font-size: 1.6rem;
  margin-bottom: 20px;
  color: #0a1f44;
}

/* COURSE LIST */
.course-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* COURSE CARD */
.course-card {
  background: #ffffff;
  padding: 18px 20px;
  border-radius: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 6px 18px rgba(0,0,0,0.08);
}

.course-card h3 {
  font-size: 1.1rem;
  margin-bottom: 4px;
  color: #111;
}

.course-card span {
  font-size: 0.9rem;
  color: #555;
}

/* BUTTON */
.select-btn {
  padding: 10px 22px;
  background: #0a1f44;
  color: #fff;
  text-decoration: none;
  border-radius: 6px;
  font-size: 0.95rem;
  transition: 0.3s;
}

.select-btn:hover {
  background: #102d66;
}