/* 全体のスタイル */
body {
  background-color: #f9f9f9;
  color: #333;
  font-family: 'Noto Sans JP', sans-serif;
  margin: 0;
  padding: 0;
}

/* ヘッダー */
header {
  background: linear-gradient(to right, #ffffff, #f0f0f0);
  padding: 20px 0;
  text-align: center;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

h1 {
  font-size: 2rem;
  font-weight: 700;
  color: #333;
}

#search-form input {
  width: 80%;
  max-width: 500px;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
  background: #fff;
  color: #333;
  font-size: 1rem;
  margin-top: 10px;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* メインコンテンツ */
.container {
  width: 90%;
  max-width: 1200px;
  margin: auto;
  padding: 20px 0;
}

/* 投稿された論文 */
h2 {
  font-size: 1.5rem;
  border-left: 5px solid #ffcc00;
  padding-left: 10px;
  color: #333;
  margin-bottom: 20px;
}

/* 論文カードのデザイン */
.paper-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.paper-card {
  background: #ffffff;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.paper-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.15);
}

.paper-title {
  font-size: 1.3rem;
  font-weight: bold;
  color: #333;
}

.paper-summary {
  font-size: 1rem;
  color: #666;
  margin: 10px 0;
}

.paper-author {
  font-style: italic;
  color: #999;
  font-size: 0.9rem;
}

/* ボタン */
.paper-buttons {
  margin-top: 15px;
}

.view-pdf-btn, .download-btn {
  display: inline-block;
  padding: 10px 15px;
  border-radius: 5px;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: bold;
  transition: background 0.3s ease, transform 0.2s ease;
}

.view-pdf-btn {
  background: linear-gradient(to right, #007bff, #0056b3);
  color: white;
}

.view-pdf-btn:hover {
  background: linear-gradient(to right, #0056b3, #003f7f);
  transform: scale(1.05);
}

.download-btn {
  background: linear-gradient(to right, #ffcc00, #ffaa00);
  color: white;
  margin-left: 10px;
}

.download-btn:hover {
  background: linear-gradient(to right, #ffaa00, #ff8800);
  transform: scale(1.05);
}

@media (min-width: 1024px) {
  body {
    background-color: #f9f9f9;
  }

  .container {
    width: 80%;
    max-width: 1200px;
  }
}






/*支払いフォーム*/
.form{
  margin-top: 50px;
  margin-right: auto;
  margin-left: auto;
  margin-bottom: 50px;
  text-align: center;
}

#payment-header{
  padding: 1px 0;
}