* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "Noto Sans JP",
    sans-serif;
  background-color: #5c73b7;
  color: #222;
}

header {
  height: 54px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  width: 100%;
  padding: 0 20px;
  background-color: #5c73b7;
  border-bottom: 1px solid #d6d6d6;
  position: relative;
}

header h1 {
  margin: 0;
  font-size: 20px;
  font-weight: 600;
  color: #fff;
}

#menuButton {
  position: absolute;
  left: 20px;
  width: 42px;
  height: 42px;
  border: 1px solid #cfcfcf;
  border-radius: 6px;
  background-color: #fff;
  color: #333;
  font-size: 22px;
  cursor: pointer;
}

#currentLanguage {
  position: absolute;
  right: 20px;
  padding: 5px 10px;
  border: 1px solid #000;
  border-radius: 5px;
  background-color: #fff;
  font-size: 13px;
  color: #222;
}

#languageMenu {
  position: fixed;
  top: 54px;
  left: 0;
  width: 280px;
  height: calc(100vh - 54px);
  padding: 18px;
  background-color: #fff;
  border-right: 1px solid #d6d6d6;
  overflow-y: auto;
  transform: translateX(-100%);
  transition: transform 0.2s;
  z-index: 10;
}

#languageMenu.open {
  transform: translateX(0);
}

#languageMenu ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

#languageMenu li:last-child {
  grid-column: 1 / -1;
}

#languageMenu button {
  width: 100%;
  padding: 9px 8px;
  border: 1px solid #d2d2d2;
  border-radius: 5px;
  background-color: #fff;
  color: #333;
  text-align: left;
  cursor: pointer;
}

#languageMenu button:hover {
  background-color: #f5f5f5;
}

main {
  max-width: 1400px;
  margin: 0 auto;
  padding: 28px 20px 30px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.editor-section {
  min-width: 0;
}

.editor-section h2 {
  margin: 0 0 8px;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
}

#inputCode,
#outputCode {
  display: block;
  width: 100%;
  min-height: 460px;
  padding: 16px;
  background-color: #fff;
  border: 1px solid #cfcfcf;
  border-radius: 6px;
  color: #222;
  font-family:
    "Cascadia Code",
    "Consolas",
    "Courier New",
    monospace;
  font-size: 14px;
  line-height: 1.6;
  resize: vertical;
  outline: none;
}

#inputCode:focus,
#outputCode:focus {
  border-color: #999;
}

.action-buttons {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 20px 30px;
  display: flex;
  gap: 8px;
}

.action-buttons button {
  padding: 9px 16px;
  border: 1px solid #cfcfcf;
  border-radius: 5px;
  background-color: #fff;
  color: #333;
  cursor: pointer;
}

.action-buttons button:hover {
  background-color: #f5f5f5;
}

/* サイト解説 */

.about-section {
  width: 100%;
  padding: 60px 20px 70px;
  background-color: #fff;
  border-top: 1px solid #d6d6d6;
}

.about-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.about-section h2 {
  margin: 0 0 16px;
  font-size: 24px;
  font-weight: 600;
  color: #222;
}

.about-lead {
  margin: 0;
  max-width: 760px;
  font-size: 15px;
  line-height: 1.9;
  color: #555;
}

.about-cards {
  margin-top: 35px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.about-card {
  padding: 22px;
  border: 1px solid #d9d9d9;
  border-radius: 7px;
  background-color: #fff;
}

.about-card h3 {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 600;
  color: #222;
}

.about-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: #555;
}

.how-to-use {
  margin-top: 55px;
  padding-top: 35px;
  border-top: 1px solid #e0e0e0;
}

.how-to-use h2 {
  margin-bottom: 20px;
}

.how-to-use ol {
  margin: 0;
  padding-left: 24px;
  color: #black;

}

.how-to-use li {
  margin-bottom: 10px;
  font-size: 14px;
  line-height: 1.7;
}

.notice-box {
  margin-top: 45px;
  padding: 22px;
  border: 5px solid red;
  border-radius: 9%;
  background-color: yellow;
}

.notice-box h2 {
  margin-bottom: 10px;
  font-size: 17px;
}

.notice-box p {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: #666;
}

footer {
  padding: 20px;
  border-top: 1px solid #d6d6d6;
  background-color: #fff;
  text-align: center;
  color: #5c73b7;
  font-size: 17px;
}

footer p {
  margin: 0;
}

@media (max-width: 799px) {
  header {
    padding: 0 60px;
  }

  #menuButton {
    left: 12px;
  }

  #currentLanguage {
    right: 12px;
  }

  main {
    grid-template-columns: 1fr;
    padding: 20px 12px 30px;
  }

  #inputCode,
  #outputCode {
    min-height: 320px;
  }

  .action-buttons {
    padding-left: 12px;
    padding-right: 12px;
  }

  .about-section {
    padding: 45px 16px 55px;
  }

  .about-section h2 {
    font-size: 21px;
  }

  .about-cards {
    grid-template-columns: 1fr;
  }
}