:root {
  --bg-dark: #0A2E22;
  --bg-main: #E0E5E5;
  --bg-white: #FFFFFF;
  --accent-orange: #F4A261;
  --accent-purple: #D4C1EC;
  --accent-mint: #A8D5BA;
  --border-dark: #000000;
  
  --font-mono: 'JetBrains Mono', monospace;
  --font-sans: 'Inter', sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-main);
  color: var(--border-dark);
  font-family: var(--font-sans);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* TYPOGRAPHY */
.mono { font-family: var(--font-mono); }
.uppercase { text-transform: uppercase; }

/* HEADER */
header {
  background-color: var(--bg-dark);
  color: var(--bg-white);
  padding: 24px 32px;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  border-bottom: 2px solid var(--border-dark);
}

.header-left .sub-brand {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: #A8D5BA; /* Light Mint */
  margin-bottom: 4px;
  letter-spacing: 1px;
}

.header-left .brand {
  font-family: var(--font-sans);
  font-size: 3rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -2px;
}

.header-right {
  text-align: right;
  font-family: var(--font-mono);
  font-size: 0.95rem;
}
.header-right .user-id {
  color: #A8D5BA;
  margin-bottom: 6px;
}
.header-right .user-id a {
  color: inherit;
  text-decoration: none;
  transition: color 0.15s ease;
}
.header-right .user-id a:hover {
  color: #ffffff;
}
.header-right .session {
  color: var(--bg-white);
  font-weight: 700;
}

/* CONTROL BAR */
.control-bar {
  padding: 24px 32px;
  display: flex;
  gap: 24px;
  align-items: center;
  border-bottom: 1px solid var(--border-dark);
}

.url-input-group {
  display: flex;
  flex: 1;
  border: 1px solid var(--border-dark);
  background: var(--bg-white);
  height: 48px;
  transition: all 0.2s ease;
}

.url-input-group.drag-active {
  border: 2px dashed var(--border-dark);
  background-color: var(--accent-mint);
}

.upload-toggle {
  display: flex;
  align-items: center;
}

.upload-icon-btn {
  background-color: transparent;
  border: none;
  cursor: pointer;
  padding: 0 12px;
  display: flex;
  align-items: center;
  font-size: 1.4rem;
}

.clear-upload-btn {
  background: transparent;
  border: none;
  color: #ff4444;
  font-weight: 800;
  cursor: pointer;
  padding: 0 16px;
  font-family: var(--font-mono);
  display: none;
}

.url-label {
  background-color: var(--bg-dark);
  color: var(--bg-white);
  padding: 0 16px;
  display: flex;
  align-items: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.9rem;
}

.url-input {
  flex: 1;
  border: none;
  padding: 0 16px;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  outline: none;
  color: var(--border-dark);
  min-width: 0;
}

.url-input:disabled {
  background: #F0F0F0;
}

.btn {
  height: 48px;
  border: 1px solid var(--border-dark);
  padding: 0 24px;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.1s, box-shadow 0.1s, background-color 0.2s;
}

.btn:active {
  transform: translateY(2px);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-orange {
  background-color: var(--accent-orange);
  color: var(--border-dark);
}

.btn-purple {
  background-color: var(--accent-purple);
  color: var(--border-dark);
}


.btn-green {
  background-color: var(--bg-dark);
  color: var(--bg-white);
}

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

.quiz-nav-group .btn {
  flex: 1;
}

/* DROP-UP/DOWN MENU FOR DOWNLOADS */
.download-container {
  position: relative;
  display: flex;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  background-color: var(--bg-white);
  border: 1px solid var(--border-dark);
  min-width: max-content;
  width: 100%;
  z-index: 1000;
  display: none;
  box-shadow: 4px 4px 0 var(--border-dark);
  margin-top: 4px;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

.dropdown-menu.show {
  display: block;
  animation: fadeIn 0.15s ease-out;
}

.dropdown-item {
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  border-bottom: 1px solid #eee;
  transition: background-color 0.2s;
  color: var(--border-dark);
}

.dropdown-item:last-child {
  border-bottom: none;
}

.dropdown-item:hover {
  background-color: var(--accent-mint);
}

/* MAIN WORKSPACE */
.workspace {
  display: grid;
  grid-template-columns: 1.8fr 1fr;
  flex: 1;
}

.col-left, .col-right {
  padding: 32px;
  min-width: 0; /* Enforce strict fr ratio regardless of content size */
}

.col-left {
  border-right: 1px solid var(--border-dark);
}

/* HEADERS */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 2px solid var(--border-dark);
  padding-bottom: 12px;
  margin-bottom: 24px;
  gap: 20px;
}

.section-header h2 {
  font-family: var(--font-sans);
  font-size: 1.5rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.5px;
  margin: 0;
  white-space: nowrap;
}

.section-meta {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: #7A8B8B;
  text-align: right;
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.header-title-group {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.edit-actions {
  display: flex;
  gap: 8px;
}

.btn-edit-toggle {
  background-color: var(--bg-white);
  border: 1px solid var(--border-dark);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 4px 10px;
  cursor: pointer;
  font-weight: 800;
  text-transform: uppercase;
}

.btn-edit-toggle.active {
  background-color: var(--accent-orange);
}

.desktop-font-controls {
  display: flex;
  gap: 8px;
}

.font-btn {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 1.2rem;
  cursor: pointer;
  border: 1px solid var(--border-dark);
  transition: transform 0.1s;
}

.font-btn:active {
  transform: translateY(2px);
}

.font-btn-decrease {
  background-color: var(--accent-mint);
  color: var(--border-dark);
}

.font-btn-increase {
  background-color: var(--accent-orange);
  color: var(--border-dark);
}

/* CARDS */
.card {
  border: 1px solid var(--border-dark);
  background-color: var(--bg-white);
  padding: 24px;
  margin-bottom: 16px;
}

.study-guide-card {
  background-color: #0d1117; /* Dark background for the generated guide */
  color: #e2e8f0;
  border: 2px solid var(--border-dark);
}

.study-guide-card .card-body {
  font-size: 1em; /* Allow inheritance for scaling */
}

.guide-edit-area {
  width: 100%;
  min-height: 600px;
  background-color: #0d1117;
  color: #e2e8f0;
  border: 2px solid var(--border-dark);
  padding: 24px;
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1.6;
  resize: vertical;
  outline: none;
  display: none;
}

.card.processing {
  border: 1px dashed var(--border-dark);
  background-color: transparent;
}

.card-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 12px;
}

.circle-num {
  width: 32px;
  height: 32px;
  background-color: var(--bg-dark);
  color: var(--bg-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 1rem;
}

.card.processing .circle-num {
  background-color: #8D9999;
}

.card-title {
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 1.15rem;
  text-transform: uppercase;
}

.card.processing .card-title {
  color: #666;
}

.card-body {
  font-size: 0.95rem;
  line-height: 1.5;
  color: #333;
}

.card.processing .card-body {
  color: #666;
}

/* RIGHT COL - QUIZ */
.quiz-question-box {
  background-color: var(--accent-mint);
  border: 1px solid var(--border-dark);
  padding: 24px;
  margin-bottom: 24px;
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 1.1rem;
  line-height: 1.4;
  text-transform: uppercase;
}

.options-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.quiz-option {
  border: 1px solid var(--border-dark);
  background-color: var(--bg-white);
  padding: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  min-height: 72px;
}

.quiz-option.active {
  background-color: var(--accent-purple);
}

.quiz-option-text {
  font-size: 1rem;
  line-height: 1.4;
  padding-right: 16px;
}

.quiz-tag {
  background-color: var(--bg-dark);
  color: var(--bg-white);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.75rem;
  padding: 6px 10px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.quiz-tag.muted {
  background-color: transparent;
  color: transparent; /* hide structurally until hover/active */
}

.quiz-option:hover:not(.active) .quiz-tag.muted {
  background-color: #333;
  color: var(--bg-white);
}

.submit-quiz-btn {
  width: 100%;
  height: 56px;
  background-color: var(--accent-orange);
  color: #000000 !important;
  border: 1px solid var(--border-dark);
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.1s;
}

.submit-quiz-btn:active {
  transform: translateY(2px);
}

/* QUIZ RESULTS SUMMARY */
.results-header {
  text-align: center;
  margin-bottom: 32px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--border-dark);
}

.score-display {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 800;
  color: var(--accent-orange);
  margin-bottom: 8px;
}

.score-label {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  text-transform: uppercase;
  color: #7A8B8B;
}

.results-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 32px;
}

.result-row {
  border: 1px solid var(--border-dark);
  padding: 16px;
  background: #ffffff;
  display: flex;
  flex-direction: column;
  gap: 12px;
  cursor: pointer;
  transition: transform 0.1s ease;
}

.result-row:hover {
  transform: translateX(4px);
  background: #f8f9fa;
}

.result-row.correct { border-left: 8px solid #28a745; }
.result-row.wrong { border-left: 8px solid #dc3545; }

.result-q-title {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.4;
  color: #0d1117;
}

.result-answers {
  display: flex;
  gap: 24px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.res-ans {
  display: flex;
  align-items: center;
  gap: 8px;
}

.res-ans.user-wrong { color: #dc3545; }
.res-ans.user-correct { color: #28a745; }
.res-ans.actual { color: #28a745; border: 1px dashed #28a745; padding: 2px 6px; }

.summary-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* DARK MODE MARKDOWN STYLING */
.markdown-body h1, .markdown-body h2, .markdown-body h3 {
  color: var(--accent-mint);
  margin-top: 1.5rem;
  margin-bottom: 1rem;
  font-family: var(--font-mono);
}
.markdown-body h1 { font-size: 1.8em; border-bottom: 1px solid #30363d; padding-bottom: 8px; }
.markdown-body h2 { font-size: 1.4em; border-bottom: 1px solid #30363d; padding-bottom: 4px; }
.markdown-body h3 { font-size: 1.1em; color: var(--accent-orange); }

.markdown-body {
  overflow-wrap: anywhere;
  word-wrap: break-word;
}

.markdown-body a { 
  color: #58a6ff; 
  text-decoration: none; 
  word-break: break-all;
}
.markdown-body a:hover { text-decoration: underline; }

.markdown-body p, .markdown-body li {
  color: #ffffff;
  margin-bottom: 0.8rem;
  line-height: 1.6;
}

.markdown-body ul, .markdown-body ol {
  padding-left: 2rem;
  margin-bottom: 1rem;
}

.markdown-body code {
  color: #FF4B4B; /* Vibrant red for visibility on dark background */
  background-color: rgba(110, 118, 129, 0.4);
  padding: 0.2em 0.4em;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 85%;
}

.markdown-body pre {
  background-color: #161b22;
  padding: 16px;
  border: 1px solid #30363d;
  overflow: auto;
  margin-bottom: 1rem;
}

.markdown-body pre code {
  background: transparent;
  padding: 0;
}

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1rem;
}
.markdown-body table th, .markdown-body table td {
  border: 1px solid #30363d;
  padding: 8px 12px;
  color: #ffffff;
}
.markdown-body table th {
  background-color: #161b22;
}

/* RESPONSIVE DESIGN */
@media (max-width: 900px) {
  header {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    padding: 20px;
  }
  
  .header-left .brand {
    font-size: 2.2rem;
    letter-spacing: -1px;
    word-break: break-all;
  }
  
  .header-right {
    text-align: left;
    width: 100%;
  }
  
  .control-bar {
    flex-direction: column;
    align-items: stretch;
    padding: 20px;
    gap: 12px;
  }

  .url-input-group {
    flex-direction: column;
    height: auto;
    border: none;
    background: transparent;
  }
  
  .url-label {
    width: 100%;
    height: 32px;
    border: 1px solid var(--border-dark);
    justify-content: flex-start;
  }
  
  .url-input {
    width: 100%;
    height: 48px;
    border: 1px solid var(--border-dark);
    border-top: none;
  }

  .download-container, .download-container .btn {
    width: 100%;
  }
  
  .workspace {
    grid-template-columns: 1fr;
    width: 100%;
    overflow-x: hidden;
  }
  
  .col-left {
    border-right: none;
    border-bottom: 1px solid var(--border-dark);
  }
  
  .col-left, .col-right {
    padding: 12px;
    width: 100%;
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding-bottom: 12px;
  }

  .desktop-font-controls {
    display: none;
  }

  .section-meta {
    word-break: break-all;
    width: 100%;
    text-align: left;
  }

  /* Prevent markdown and card content from overflowing the screen */
  .card, .quiz-question-box, .quiz-option, .quiz-rationale-box, .quiz-nav-group, .markdown-body {
    width: 100%;
    max-width: 100%;
    padding: 16px;
  }

  .markdown-body a {
    overflow-wrap: anywhere;
  }

  .markdown-body pre, 
  .markdown-body table {
    max-width: 100%;
    overflow-x: auto;
    display: block;
  }
  
  .markdown-body img {
    max-width: 100%;
    height: auto;
  }

  .quiz-nav-group button {
    font-size: 0.75rem !important;
    padding: 8px 4px !important;
    flex: 1;
    min-width: 0;
  }
}

@media (max-width: 480px) {
  .header-left .brand {
    font-size: 1.8rem;
  }
  
  header {
    padding: 16px;
  }
}

html, body {
  overflow-x: hidden;
  max-width: 100%;
  width: 100%;
  position: relative;
}

@keyframes pulse {
  0% { opacity: 0.7; }
  50% { opacity: 1; }
  100% { opacity: 0.7; }
}

.pulse {
  animation: pulse 2s infinite ease-in-out;
}