body {
  font-family: 'Segoe UI', 'Yu Gothic', 'Meiryo', sans-serif;
  background: linear-gradient(to right, #1e3c72, #2a5298);
  color: #fff;
  margin: 0;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

header {
  background: #141e30;
  padding: 1.5rem 1rem;
  text-align: center;
  font-size: 2rem;
  font-weight: bold;
  letter-spacing: 0.08em;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
  user-select: none;
}

main {
  padding: 2rem 1rem;
  max-width: 980px;
  margin: 0 auto;
}

section {
  margin-bottom: 2.5rem;
  background: rgba(255, 255, 255, 0.07);
  border-radius: 1rem;
  padding: 1.5rem 1.2rem;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.15);
  transition: background-color 0.3s ease;
}

section:hover {
  background: rgba(255, 255, 255, 0.12);
}

h2 {
  font-size: 1.4rem;
  border-bottom: 2px solid #fff;
  margin-bottom: 1rem;
  padding-bottom: 0.3rem;
  user-select: none;
}

.caption {
  color: #cce8ff;
  font-size: 0.97em;
  margin-bottom: 0.3em;
  user-select: none;
}

.card-list {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
}

.card {
  background: rgba(255, 255, 255, 0.06);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  border-radius: 0.7rem;
  padding: 1.2rem;
  min-width: 250px;
  flex: 1 1 280px;
  margin-bottom: 0.8rem;
  color: #fff;
  transition: box-shadow 0.3s, background-color 0.3s;
  word-break: break-word;
}

.card:hover {
  box-shadow: 0 6px 22px rgba(0, 255, 255, 0.22);
  background-color: rgba(0, 255, 255, 0.06);
}

.loader {
  border: 4px solid #f3f3f3;
  border-top: 4px solid #00ffcc;
  border-radius: 50%;
  width: 32px;
  height: 32px;
  animation: spin 1s linear infinite;
  margin: 1.5rem auto;
  display: block;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg);}
}

.error {
  color: #ffb3b3;
  font-weight: bold;
  margin-top: 1.2rem;
  user-select: none;
}

.input-group {
  display: flex;
  gap: 0.7rem;
  margin-top: 0.7rem;
  margin-bottom: 1.2rem;
  flex-wrap: wrap;
}

input[type="text"] {
  flex: 1;
  padding: 0.6em 0.9em;
  border: 1px solid #ccc;
  border-radius: 0.4em;
  font-size: 1em;
  background: #f7fafd;
  color: #222;
  transition: border-color 0.3s, box-shadow 0.3s;
}

input[type="text"]:focus {
  outline: none;
  border-color: #00ffd0;
  box-shadow: 0 0 8px #00ffd0;
}

button {
  background: linear-gradient(90deg, #00ffd0, #3586ff);
  border: none;
  border-radius: 0.4em;
  padding: 0.6em 1.3em;
  color: #222;
  font-weight: bold;
  font-size: 1em;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
  transition: background 0.2s, color 0.2s;
  user-select: none;
}

button:hover {
  background: linear-gradient(90deg, #00c0a8, #276bd6);
  color: #fff;
}

.platform-badge {
  display: inline-block;
  background: #00bac7;
  color: #07283d;
  font-size: 0.95em;
  border-radius: 0.6em;
  margin-right: 0.4em;
  padding: 0.13em 0.6em;
  font-weight: bold;
  letter-spacing: 0.03em;
  user-select: none;
}

ul.info-list {
  list-style: none;
  padding-left: 0;
  margin: 0.7em 0 0 0;
}

ul.info-list li {
  margin-bottom: 0.2em;
  font-size: 0.98em;
}

@media (max-width: 600px) {
  .card-list {
    flex-direction: column;
  }

  main {
    padding: 1rem 4vw;
  }

  section {
    padding: 1.2rem 4vw;
  }

  .input-group {
    flex-direction: column;
    gap: 0.5rem;
  }

  button {
    width: 100%;
  }
}

.card img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 0.5rem;
}