* {
  box-sizing: border-box;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  margin: 0;
  padding: 20px;
  background: #f4f4f4;
}

#app {
  max-width: 900px;
  margin: 0 auto;
  background: #ffffff;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

h1 {
  margin-top: 0;
  color: #1976d2;
}

h2 {
  margin-top: 0;
  color: #333;
}

.page-title {
  font-size: 24px;
  margin-bottom: 20px;
  color: #1976d2;
}

.page-content {
  margin-bottom: 30px;
  line-height: 1.6;
  color: #555;
  font-size: 16px;
}

[dir="rtl"] {
  direction: rtl;
  text-align: right;
}

.form-group {
  margin-bottom: 20px;
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
  color: #333;
}

/* Fix alignment for inline checkbox / radio controls inside form groups
   Keep global label display:block for other inputs, but when a checkbox
   or radio is placed immediately before a label inside a .form-group,
   show the label inline and vertically center it with the control. */
.form-group input[type="checkbox"] + label,
.form-group input[type="radio"] + label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0; /* remove block spacing */
  cursor: pointer;
  font-weight: 600;
}

.form-group input[type="checkbox"],
.form-group input[type="radio"] {
  vertical-align: middle;
  margin: 0 0.25rem 0 0.25rem;
  position: relative;
  top: 2px; /* move inputs a few pixels down to align with text */
}

input[type="text"] {
  width: 100%;
  padding: 10px;
  font-size: 14px;
  border-radius: 6px;
  border: 1px solid #ccc;
}

input[type="text"]:focus {
  outline: none;
  border-color: #1976d2;
}

input[type="checkbox"] {
  margin-right: 8px;
}

button {
  padding: 10px 20px;
  border-radius: 6px;
  border: none;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  background: #1976d2;
  color: #fff;
  transition: background 0.2s;
}

button:hover:not(:disabled) {
  background: #1565c0;
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.button-group {
  display: flex;
  gap: 12px;
  margin-top: 20px;
}

.error {
  color: #c62828;
  margin-top: 10px;
  padding: 10px;
  background: #ffebee;
  border-radius: 6px;
}

.info-box {
  background: #e3f2fd;
  padding: 15px;
  border-radius: 6px;
  margin-bottom: 20px;
}

.info-box h3 {
  margin-top: 0;
  color: #0d47a1;
}

.info-item {
  margin: 8px 0;
}

.info-label {
  font-weight: 600;
  color: #555;
}

.debug-info {
  background: #fff3e0;
  padding: 15px;
  border-radius: 6px;
  margin-bottom: 20px;
  border-left: 4px solid #ff9800;
}

.debug-info h4 {
  margin-top: 0;
  color: #e65100;
}

.debug-item {
  margin: 6px 0;
  font-family: monospace;
  font-size: 13px;
}

.iframe-placeholder {
  width: 100%;
  height: 400px;
  background: #e0e0e0;
  border: 2px dashed #999;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #666;
  font-size: 16px;
  margin: 20px 0;
  text-align: center;
}

select {
  width: 100%;
  padding: 10px;
  font-size: 14px;
  border-radius: 6px;
  border: 1px solid #ccc;
  margin-bottom: 20px;
}

select:focus {
  outline: none;
  border-color: #1976d2;
}

.correct-answers {
  background: #f5f5f5;
  padding: 15px;
  border-radius: 6px;
  margin: 20px 0;
}

.correct-answers h4 {
  margin-top: 0;
}

.answer-item {
  margin: 8px 0;
}

/* Video wrapper styles for experiment explanation video */
.video-wrapper {
  max-width: 900px;
  width: 100%;
  border-radius: 8px;
  overflow: hidden;
}
.video-wrapper video {
  width: 100%;
  height: auto;
  display: block;
}

/* Page-specific tweaks for the experiment video page only */
#mediaSlot_experiment_video { margin: 0 0 6px 0; }
.video-instr { margin: 6px 0 4px 0; font-size: 15px; color: #555; }
#mediaSlot_experiment_video .video-wrapper { margin-top: 0; }
#mediaSlot_experiment_video .iframe-placeholder { margin: 6px 0; }