* {
    box-sizing: border-box;
}

body {

    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;

    background: #111;
    color: white;

}

.app {

    min-height: 100vh;

    display: flex;
    flex-direction: column;

}

.header {

    text-align: center;
    padding: 40px 20px 20px;

}

.subtitle {

    opacity: 0.8;
    font-size: 14px;

}

.menu {

    flex: 1;

    max-width: 500px;
    margin: auto;

    width: 100%;

    padding: 20px;

}

.card {

    background: #1e1e1e;

    border-radius: 16px;

    padding: 22px;

    margin-bottom: 22px;

    border: 1px solid #2a2a2a;

    box-shadow: 0 6px 18px rgba(0,0,0,0.5);

    transition: 0.2s;

}

.card:hover {

    transform: translateY(-4px);

}

.card h2 {

    margin-top: 0;

}

button {

    width: 100%;

    padding: 16px;

    margin-top: 10px;

    font-size: 16px;

    border: none;

    border-radius: 10px;

    background: linear-gradient(45deg,#ff6a00,#ff8c00);

    color: white;

}

button:active {

    transform: scale(0.98);

}

.site-icon {

  width: 80px;

  height: auto;

  margin-bottom: 8px;

  filter: drop-shadow(0 4px 8px rgba(0,0,0,0.5));

}

@media (max-width:768px){

.menu{

    padding: 16px;

}

.card{

    padding: 20px;

}

button{

    font-size: 18px;

    padding: 18px;

}

}

/* =========================
📌 ナビゲーション
========================= */

.page-nav {

  display: flex;
  gap: 10px;

  padding: 12px 15px;

  background: #000;

  border-bottom: 3px solid #ff6a00;

}

.page-nav button {

  flex: 1 1 calc(50% - 10px);

  height: 50px;

  border-radius: 12px;

  border: none;

  background: #1f1f1f;

  color: white;

  font-size: 16px;

  font-weight: bold;

  cursor: pointer;

  transition: 0.15s;

  white-space: nowrap;

}

.page-nav button:hover {
  background: #ff6a00;
}

.page-nav button.active {

  background: #ff6a00;

  box-shadow: 0 4px 12px rgba(255,106,0,0.4);

}

.page-nav button:active {
  transform: scale(0.96);
}

.page-nav {
  display: flex;
  gap: 10px;
}

.page-nav {
  flex-wrap: wrap;
}

.footer {
  text-align: center;
  margin-top: 40px;
  padding: 20px;
  text-align: center;
  font-size: 14px;
  color: #777;
}

.footer a {
  color: #555;
  text-decoration: none;
  margin: 0 8px;
}

.footer a:hover {
  text-decoration: underline;
}