/* 1画面に収まるコード入力ページのスタイルに変更 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Noto Sans JP", sans-serif;
  background-color: #1a1a1a;
  color: #ffffff;
  overflow: hidden;
}

.code-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  width: 100vw;
  padding: 2rem;
}

.code-container {
  width: 100%;
  max-width: 500px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.code-logo {
  display: block;
  cursor: pointer;
  transition: opacity 0.3s ease;
}

.code-logo:hover {
  opacity: 0.7;
}

.code-logo img {
  width: 120px;
  height: auto;
  display: block;
}

.code-title {
  font-size: 1.5rem;
  font-weight: 500;
  margin: 0;
  letter-spacing: 0.05em;
}

.code-input {
  width: 100%;
  padding: 1rem 1.5rem;
  font-size: 1.1rem;
  font-family: "Noto Sans JP", sans-serif;
  background-color: #252525;
  color: #ffffff;
  border: 2px solid #333333;
  outline: none;
  transition: border-color 0.3s ease;
}

.code-input:focus {
  border-color: #666666;
}

.code-input::placeholder {
  color: #666666;
}

.code-button {
  padding: 1rem 3rem;
  font-size: 1rem;
  font-weight: 600;
  font-family: "Noto Sans JP", sans-serif;
  background-color: #ffffff;
  color: #1a1a1a;
  border: 2px solid #ffffff;
  cursor: pointer;
  transition: all 0.3s ease;
  letter-spacing: 0.1em;
}

.code-button:hover {
  background-color: #1a1a1a;
  color: #ffffff;
}

.code-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.error-message {
  color: #ff4444;
  font-size: 0.9rem;
  min-height: 1.5rem;
  text-align: center;
}

.back-link {
  color: #666666;
  font-size: 0.85rem;
  text-decoration: none;
  transition: color 0.3s ease;
  margin-top: 0.5rem;
}

.back-link:hover {
  color: #999999;
}

@media (max-width: 768px) {
  .code-logo img {
    width: 100px;
  }

  .code-title {
    font-size: 1.25rem;
  }

  .code-input {
    font-size: 1rem;
    padding: 0.875rem 1.25rem;
  }

  .code-button {
    padding: 0.875rem 2.5rem;
  }
}