body {
  font-family: Arial, sans-serif;
  background: #f9f9f9;
  margin: 0;
  padding: 0;
  text-align: center;
}

body, html {
  margin: 0;
  padding: 0;
  width: 100%;
  max-width: 200%;
  overflow-x: hidden;
  font-family: Arial, sans-serif;
  background-color: white;
  min-height: 100vh;
  transition: background-color 0.9s ease, color 0.9s ease;
}

.text-section {
  padding: 20px;
  margin: 20px auto;
  max-width: 700px;
  text-align: left;
}

.level0-container {
  border: 2px solid #222;
  border-radius: 5px;
  padding: 25px;
  max-width: 350px;
  margin: 20px auto;
  background: #fff;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.level0-container h2 {
  margin-bottom: 15px;
  font-size: 20px;
  color: #222;
}

.answer-input {
  width: 90%;
  padding: 10px;
  margin: 10px 0;
  border: 2px solid #ccc;
  border-radius: 8px;
  font-size: 16px;
}

.btn {
  padding: 10px 20px;
  margin: 10px 5px;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  transition: 0.2s;
}

.btn-confirm {
  background: #222;
  color: #fff;
}

.btn-confirm:hover {
  background: #444;
}

.btn-help {
  background: #f1c40f;
  color: #222;
}

.btn-help:hover {
  background: #d4ac0d;
}

.help-text {
  max-width: 350px;
  margin: 10px auto;
  padding: 10px;
  border-left: 4px solid #f1c40f;
  background: #fffbe6;
  color: #333;
  font-size: 14px;
  text-align: left;
  border-radius: 5px;
  display: none;
}

/* ======================== */
/* DARK MODE */
/* ======================== */

body.dark {
  background-color: #121212;
  color: #f1f1f1;
}

body.dark .text-section {
  background: #1e1e1e;
  color: #f1f1f1;
}

body.dark .level0-container {
  background: #1e1e1e;
  border-color: #00ff00;
  color: #f1f1f1;
}

body.dark .level0-container h2 {
  color: #00ff00;
  background: rgba(30, 30, 30, 0.9);
  border-bottom: 1px solid #00ff00;
}

body.dark .answer-input {
  background: #2c2c2c;
  color: #f1f1f1;
  border: 2px solid #00ff00;
}

body.dark .btn {
  background: #2c2c2c;
  color: #f1f1f1;
  border: 1px solid #00ff00;
}

body.dark .btn-confirm {
  background: #00ff00;
  color: #000;
}

body.dark .btn-help {
  background: #444;
  color: #f1f1f1;
}

body.dark .btn-help:hover {
  background: #666;
}

body.dark .level-btn {
  background: #1e1e1e;
  color: #f1f1f1;
  border: 2px solid #00ff00;
  -webkit-text-stroke: 0px #00ff00;
  text-shadow: 0 0 5px #00ff00;
}

body.dark .level-btn:hover {
  background: #00ff00;
  color: #000;
}

body.dark .help-text {
  background: #2c2c2c;
  color: #f1f1f1;
  border-left: 4px solid #f1c40f;
}