:root {
  --bg-overlay: rgba(44, 24, 16, 0.6);
  --bg-modal: #FDFBF7;
  --bg-panel: #FFFFFF;
  --text-primary: #2C1810;
  --text-secondary: #6D5E57;
  --brand-primary: #8D6E63;
  --brand-dark: #5D4037;
  --brand-accent: #A1887F;
  --border-color: #D7CCC8;
  --danger: #D32F2F;
  --success: #388E3C;
  --link: #0645AD;
  --input-bg: #FFFFFF;
  --paper: #f7f3e9;
  --ink: #222;
  --font-serif: "Playfair Display", Georgia, serif;
  --font-sans: "Lato", Arial, sans-serif;
}

.grammar-container {
  width: 90%;
  height: 90vh;
  margin: auto;
  padding: 20px;
}

.solid-line {
  border: 0;
  border-top: 2px solid #ccc;
  margin: 20px 0;
}

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
  flex-wrap: wrap;
}

.page-title {
  font-size: 28px;
  font-weight: bold;
  color: #222;
  margin: 0;
}


.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 20px;
}

.section-header h3 {
  margin: 0;
  font-size: 18px;
}

#lessons {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(238px, 1fr));
  gap: 12px;
  align-items: stretch;
  grid-auto-rows: 1fr;
}

.popup-pane {
  display: none;
}

.popup-pane.active {
  display: block;
}

#markdown-pane,
#exercise-pane {
  min-height: 350px;
}

.markdown-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 10px;
}

.lesson-button {
  position: absolute;
  top: 18px;
  left: 20px;
  padding: 8px 12px;
  font-size: 14px;
  background: #f3f4f6;
  border: 1px solid #ddd;
  border-radius: 8px;
  cursor: pointer;
}

.lesson-button:hover {
  background: #dbeafe;
}

#practice-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 250px;
  text-align: center;
  padding: 0;
  gap: 20px;
}


.paren {
  font-style: italic;
  color: #555;
  font-size: 0.9rem;
}

.instruction {
  font-size: 14px;
  color: #444;
  margin-bottom: 8px;
}

.pane-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-top: 12px;
}

#grammar-popup {
  overflow-y: auto;
}



.popup.wide-mode {
  width: 90vw;
  height: 90vh;
  max-width: 1200px;
}

.popup-content {
  width: 100%;
  margin: 0;
  padding: 0 0 10px 0;
  background: transparent;
  border-radius: 0;
}

.lesson-button {
  top: 18px;
  left: 20px;
}

#practice-progress {
  position: absolute;
  bottom: 16px;
  left: 20px;
  top: auto;
  transform: none;
}

.popup::-webkit-scrollbar {
  width: 6px;
}

.popup::-webkit-scrollbar-track {
  background-color: transparent;
  margin-top: 20px;
  margin-bottom: 20px;
}

.popup::-webkit-scrollbar-thumb {
  background-color: #bbb;
  border-radius: 6px;
}

.popup::-webkit-scrollbar-button {
  display: none !important;
}


#grammar-popup,
#grammar-popup * {
  font-family: var(--font-serif);
  color: var(--text-primary);
}

#markdown-content {
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16.5px;
  margin: 6px auto 10px;
  padding: 2px 6px 18px;
}

#markdown-content h1,
#markdown-content h2,
#markdown-content h3,
#markdown-content h4,
#markdown-content h5,
#markdown-content h6 {
  font-weight: 700;
  line-height: 1.25;
  margin: 1.2em 0 0.5em;
  color: var(--text-primary);
}

#markdown-content h1 {
  font-size: 1.8rem;
  padding-bottom: .3rem;
}

#markdown-content h2 {
  font-size: 1.5rem;
  padding-bottom: .25rem;
}

#markdown-content h3 {
  font-size: 1.25rem;
}

#markdown-content h4 {
  font-size: 1.1rem;
}

#markdown-content h5 {
  font-size: 1rem;
}

#markdown-content h6 {
  font-size: .95rem;
  color: var(--text-secondary);
}

#markdown-content p {
  margin: 0.7em 0;
}

#markdown-content ul,
#markdown-content ol {
  margin: 0.6em 0 0.8em;
  padding-left: 1.4rem;
}

#markdown-content li {
  margin: 0.25em 0;
}

#markdown-content li::marker {
  color: var(--brand-accent);
}

#markdown-content hr {
  border: 0;
  border-top: 1px solid var(--border-color);
  margin: 1.4em 0;
}

#markdown-content a {
  color: var(--brand-dark);
  text-decoration: none;
  border-bottom: 1px solid var(--brand-accent);
  font-weight: 600;
  transition: background 0.2s;
}

#markdown-content a:hover {
  background-color: rgba(141, 110, 99, 0.1);
  border-bottom-color: var(--brand-dark);
}

#markdown-content blockquote {
  margin: 0.9em 0;
  padding: 0.75em 1em;
  border-left: 4px solid var(--brand-primary);
  background: var(--paper);
  color: var(--text-secondary);
  border-radius: 8px;
  font-style: italic;
}

#markdown-content code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  background: var(--paper);
  border: 1px solid var(--border-color);
  color: var(--brand-dark);
  padding: .15em .35em;
  border-radius: 6px;
  font-size: 0.95em;
}

#markdown-content pre {
  background: var(--text-primary);
  color: #FDFBF7;
  padding: 12px 14px;
  border-radius: 10px;
  overflow: auto;
  margin: 0.9em 0 1.1em;
  border: 1px solid var(--brand-dark);
}

#markdown-content pre code {
  background: transparent;
  padding: 0;
  border: none;
  border-radius: 0;
  font-size: 0.93em;
  color: inherit;
}

#markdown-content table {
  width: fit-content;
  border-collapse: collapse;
  margin: 1em 0;
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  overflow: hidden;
  display: block;
  overflow-x: auto;
  box-shadow: 0 2px 4px rgba(44, 24, 16, 0.05);
}

#markdown-content thead th {
  background: var(--brand-primary);
  color: #FFFFFF;
  font-weight: 600;
  text-align: left;
  white-space: nowrap;
  letter-spacing: 0.02em;
}

#markdown-content th,
#markdown-content td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
}

#markdown-content tbody tr:nth-child(odd) {
  background: #faf9f6;
}

#markdown-content tbody tr:hover {
  background: rgba(141, 110, 99, 0.08);
}

#markdown-content dl {
  margin: 1em 0;
}

#markdown-content dt {
  font-weight: 600;
  margin-top: .6em;
  color: var(--brand-dark);
}

#markdown-content dd {
  margin-left: 1rem;
  color: var(--text-secondary);
}

#markdown-content kbd {
  padding: .15em .4em;
  border: 1px solid var(--border-color);
  border-bottom-width: 2px;
  border-radius: 6px;
  background: #fff;
  font-size: .9em;
  color: var(--text-primary);
  box-shadow: inset 0 -1px 0 var(--border-color);
}

#markdown-title,
.popup .markdown-title {
  display: none !important;
}

.lesson-title {
  display: flex;
}

.lesson-title-prefix,
.lesson-title-main {
  display: block;
  font-weight: 600;
  line-height: 1.25;
  font-size: 0.8rem;
}

.lesson-title-note {
  display: block;
  font-size: 12px;
  color: #64748b;
  margin-top: 2px;
}


.instruction {
  font-size: 15px;
  font-style: italic;
  color: #5D4037;
  margin-bottom: 24px;
  line-height: 1.5;
}

.mcq-question {
  margin: 10px 0 25px 0;
  font-size: 24px;
  font-weight: 500;
  color: var(--text-primary);
}

@media (max-width: 600px) {
  .popup.wide-mode {
    width: 100vw;
    height: 100vh;
    max-width: none;
  }
}