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

html {
  height: 100%;
  margin: 0;
}

body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  background-color: #f0f0f0;
  margin: 0;
  padding-left: 0;
  padding-right: 0;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main {
  flex: 1;
  width: 100%;
  margin: 0 auto;
  background: #fff;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.card-link {
  display: block;
  border: 1px solid #ccc;
  border-radius: 8px;
  padding: 15px 20px;
  margin-bottom: 15px;
  text-decoration: none;
  color: #333;
  background-color: #fdfdfd;
  transition: all 0.3s ease;
}

.card-link:hover {
  border-color: #1e90ff;
  background-color: #f0f8ff;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.card-link h2 {
  margin: 0 0 0.5em 0;
  font-size: 1.2rem;
}

.card-link p {
  margin: 0;
  font-size: 0.95rem;
  color: #555;
}

.card-link.disabled {
  pointer-events: none;
  color: #999;
  background-color: #f5f5f5;
  border-color: #ddd;
}

.card-link.disabled h2 {
  color: #aaa;
}

.card-link.disabled:hover {
  border-color: #ddd;
  background-color: #f5f5f5;
  box-shadow: none;
  cursor: default;
}

.page-title {
  font-size: 1.5em;
  font-weight: 600;
  color: #1a1f36;
  margin: 0 0 16px 8px;
  letter-spacing: 0.5px;
  font-family: "Yu Mincho", "游明朝", "Hiragino Mincho ProN", "ヒラギノ明朝 ProN W3", "ＭＳ Ｐ明朝", serif;
  padding-bottom: 6px;
}

h1,
h2,
h3 {
  color: #222;
}

h1 {
  font-size: clamp(1.5rem, 4vw, 2em);
  margin-bottom: 0.5em;
}

h2 {
  font-size: clamp(1.2rem, 3vw, 1.5em);
  margin-top: 1em;
  margin-bottom: 0.2em;
  border-bottom: solid 3px #cce4ff;
  position: relative;
}

h2:after {
  position: absolute;
  content: " ";
  display: block;
  border-bottom: solid 3px #5472cd;
  bottom: -3px;
  width: 20%;
}

h3 {
  font-size: clamp(1rem, 2.5vw, 1.2em);
  margin-top: 1.5em;
  margin-bottom: 0.3em;
}

p {
  font-size: clamp(15px, 1.1vw + 0.5rem, 18px);
  margin: 0 0;
}

ul {
  margin: 0.5em 0 0.5em 1.5em;
}

li {
  margin-bottom: 0.3em;
}

.return-link {
  display: inline-block;
  margin-bottom: 1rem;
  color: #0073aa;
  text-decoration: none;
  font-size: 0.95rem;
}

.return-link:hover {
  text-decoration: underline;
  color: #005f8c;
}

.proof-box {
  border: 2px solid #888;
  border-radius: 8px;
  padding: 1em;
  margin: 1.5em 0;
  background-color: #f9f9f9;
}

.proof-box p {
  margin: 0.5em 0;
}

.align-table {
  margin: 0 auto;
  border-collapse: collapse;
  text-align: left;
}

.align-table td {
  padding: 4px 8px;
  font-size: 16px;
}

figure {
  margin: 1em 0;
  text-align: center;
}

figure img {
  max-width: 100%;
  height: auto;
  border: 1px solid #ccc;
  border-radius: 6px;
}

figcaption {
  font-size: 0.9em;
  color: #555;
  margin-top: 0.3em;
}

.flex-images {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  gap: 10px;
  flex-wrap: wrap;
  margin: 20px 0;
}

.flex-images img {
  width: 48%;
  height: auto;
  border-radius: 6px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

@media (max-width: 600px) {
  .flex-images img {
    width: 100%;
  }
}

@media (max-width: 410px) {
  .align-table td {
    font-size: 14px;
  }
}

@media (max-width: 410px) {
  main {
    padding: 14px;
  }
}