/* 全体設定 */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', sans-serif;
}
body {
  background-color: #f5f7fa;
  color: #333;
  line-height: 1.6;
}

/* ヘッダー */
header {
  background-color: #1e3a8a;
  color: #fff;
  padding: 15px 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
header h1 {
  font-size: 20px;
}
nav a {
  color: #fff;
  margin-left: 20px;
  text-decoration: none;
  font-weight: 500;
}
nav a:hover {
  text-decoration: underline;
}

/* メイン */
main {
  padding: 40px 20px;
  max-width: 1000px;
  margin: 0 auto;
}

/* コースカード */
.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}
.course-card {
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
  overflow: hidden;
  transition: transform 0.2s;
}
.course-card:hover {
  transform: translateY(-4px);
}
.course-card img {
  width: 100%;
  height: 150px;
  object-fit: cover;
}
.course-card .content {
  padding: 15px;
}
.course-card h3 {
  font-size: 18px;
  margin-bottom: 8px;
}
.course-card p {
  color: #666;
  font-size: 14px;
}

/* ログインページ */
.login-container {
  background: #fff;
  max-width: 400px;
  margin: 80px auto;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}
.login-container h2 {
  text-align: center;
  margin-bottom: 20px;
  color: #1e3a8a;
}
.login-container input {
  width: 100%;
  padding: 10px;
  margin: 10px 0;
  border: 1px solid #ccc;
  border-radius: 5px;
}
.login-container button {
  width: 100%;
  padding: 10px;
  background: #1e3a8a;
  color: #fff;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-weight: bold;
}
.login-container button:hover {
  background: #2a4dbf;
}

/* ダッシュボード */
.dashboard {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}
.dashboard .card {
  background: #fff;
  padding: 20px;
  border-radius: 10px;
  flex: 1;
  min-width: 250px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}
.dashboard .card h3 {
  margin-bottom: 10px;
  color: #1e3a8a;
}

/* コース詳細 */
.course-detail {
  background: #fff;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}
.course-detail h2 {
  color: #1e3a8a;
  margin-bottom: 15px;
}
.course-detail p {
  margin-bottom: 15px;
}
.back-link {
  display: inline-block;
  margin-top: 10px;
  color: #1e3a8a;
  text-decoration: none;
}
.back-link:hover {
  text-decoration: underline;
}


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