@charset "UTF-8";
:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface-hover: #242836;
  --border: #2d3148;
  --text: #e1e4ed;
  --text-muted: #8b90a5;
  --accent: #6c8aff;
  --accent-hover: #8da4ff;
  --gcse: #4ecdc4;
  --as: #ff6b6b;
  --a2: #ffd93d;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  color: var(--accent-hover);
}

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 1rem 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-header .header-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.site-header .site-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
}
.site-header nav a {
  margin-left: 1.5rem;
  font-size: 0.9rem;
  padding: 0.3rem 0.7rem;
  border-radius: 6px;
  transition: background 0.2s;
}
.site-header nav a:hover {
  background: var(--surface-hover);
}
.site-header nav a.gcse {
  color: var(--gcse);
}
.site-header nav a.as {
  color: var(--as);
}
.site-header nav a.a2 {
  color: var(--a2);
}
.site-header nav a.glossary {
  color: var(--accent);
}
.site-header .nav-dropdown {
  position: relative;
  display: inline-flex;
  align-items: center;
  margin-left: 1.5rem;
}
.site-header .nav-dropdown > a {
  margin-left: 0;
}
.site-header .nav-dropdown .nav-dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 0.4rem);
  right: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.4rem;
  min-width: 130px;
  z-index: 200;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}
.site-header .nav-dropdown .nav-dropdown-menu a {
  display: block;
  margin-left: 0;
  margin-bottom: 0.1rem;
}
.site-header .nav-dropdown .nav-dropdown-menu a:last-child {
  margin-bottom: 0;
}
.site-header .nav-dropdown:hover .nav-dropdown-menu {
  display: block;
}

.glossary-page h1 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
}
.glossary-page .glossary-subtitle {
  color: var(--text-muted);
  margin-top: 0.3rem;
  margin-bottom: 1.5rem;
}

.glossary-controls {
  margin-bottom: 2rem;
}

.glossary-search {
  width: 100%;
  padding: 0.7rem 1rem;
  font-size: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  outline: none;
  margin-bottom: 1rem;
}
.glossary-search:focus {
  border-color: var(--accent);
}
.glossary-search::placeholder {
  color: var(--text-muted);
}

.glossary-alpha-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
}
.glossary-alpha-bar .alpha-link {
  display: inline-block;
  width: 2rem;
  height: 2rem;
  line-height: 2rem;
  text-align: center;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 6px;
  background: var(--surface);
  color: var(--text-muted);
  transition: background 0.2s, color 0.2s;
}
.glossary-alpha-bar .alpha-link:hover {
  background: var(--accent);
  color: var(--bg);
}

.glossary-section {
  margin-bottom: 2rem;
}

.glossary-letter {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--accent);
  margin-bottom: 1rem;
}

.glossary-entry {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.2rem;
  margin-bottom: 0.6rem;
}

.glossary-term-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.3rem;
}

.glossary-term-name {
  color: var(--accent);
  font-size: 1.05rem;
}

.glossary-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.1rem 0.45rem;
  border-radius: 4px;
}
.glossary-badge--gcse {
  background: rgba(78, 205, 196, 0.15);
  color: var(--gcse);
}
.glossary-badge--as {
  background: rgba(255, 107, 107, 0.15);
  color: var(--as);
}
.glossary-badge--a2 {
  background: rgba(255, 217, 61, 0.15);
  color: var(--a2);
}

.glossary-definition {
  color: var(--text);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 0.4rem;
}

.glossary-source-link {
  font-size: 0.8rem;
  color: var(--text-muted);
}
.glossary-source-link:hover {
  color: var(--accent);
}

.glossary-no-results {
  text-align: center;
  color: var(--text-muted);
  padding: 3rem 0;
  font-size: 1.1rem;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem;
}

.hero {
  text-align: center;
  padding: 3rem 0;
}
.hero h1 {
  font-size: 2.4rem;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, var(--gcse), var(--as), var(--a2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero p {
  color: var(--text-muted);
  font-size: 1.1rem;
}

.level-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.level-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  transition: transform 0.2s, border-color 0.2s;
}
.level-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
}
.level-card h2 {
  font-size: 1.3rem;
  margin-bottom: 0.3rem;
}
.level-card .level-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  margin-bottom: 0.8rem;
}
.level-card .level-tag.gcse {
  background: rgba(78, 205, 196, 0.15);
  color: var(--gcse);
}
.level-card .level-tag.as {
  background: rgba(255, 107, 107, 0.15);
  color: var(--as);
}
.level-card .level-tag.a2 {
  background: rgba(255, 217, 61, 0.15);
  color: var(--a2);
}
.level-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
}
.level-card .unit-list {
  list-style: none;
  margin-top: 1rem;
}
.level-card .unit-list li {
  margin-bottom: 0.5rem;
}
.level-card .unit-list li a {
  display: block;
  padding: 0.5rem 0.8rem;
  background: var(--bg);
  border-radius: 8px;
  font-size: 0.9rem;
  transition: background 0.2s;
}
.level-card .unit-list li a:hover {
  background: var(--surface-hover);
}

.breadcrumb {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}
.breadcrumb a {
  color: var(--text-muted);
}
.breadcrumb a:hover {
  color: var(--accent);
}
.breadcrumb .sep {
  margin: 0 0.4rem;
}

.unit-header {
  margin-bottom: 2rem;
}
.unit-header h1 {
  font-size: 1.8rem;
}
.unit-header p {
  color: var(--text-muted);
  margin-top: 0.3rem;
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
}

.topic-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.2rem;
  transition: transform 0.2s, border-color 0.2s;
}
.topic-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
}
.topic-card h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
  color: var(--text);
}
.topic-card .subtopic-count {
  font-size: 0.8rem;
  color: var(--text-muted);
}
.topic-card .subtopics-preview {
  list-style: none;
  margin-top: 0.6rem;
}
.topic-card .subtopics-preview li {
  font-size: 0.8rem;
  color: var(--text-muted);
  padding: 0.15rem 0;
}
.topic-card .subtopics-preview li::before {
  content: "·";
  margin-right: 0.4rem;
  color: var(--accent);
}

.topic-page .topic-header {
  margin-bottom: 2rem;
}
.topic-page .topic-header h1 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
}
.topic-page .topic-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 2rem;
}
.topic-page .toc {
  min-width: 0;
}
.topic-page .toc .toc-sticky {
  position: sticky;
  top: 5rem;
  max-height: calc(100vh - 6rem);
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
}
.topic-page .toc .toc-sticky::-webkit-scrollbar {
  width: 4px;
}
.topic-page .toc .toc-sticky::-webkit-scrollbar-track {
  background: transparent;
}
.topic-page .toc .toc-sticky::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}
.topic-page .toc .toc-toggle {
  display: none;
}
.topic-page .toc .toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.topic-page .toc .toc-list li {
  margin-bottom: 0.15rem;
}
.topic-page .toc .toc-list a {
  display: block;
  padding: 0.35rem 0.6rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  border-radius: 6px;
  border-left: 2px solid transparent;
  transition: all 0.15s;
  line-height: 1.35;
}
.topic-page .toc .toc-list a:hover {
  color: var(--text);
  background: var(--surface-hover);
}
.topic-page .toc .toc-list a.active {
  color: var(--accent);
  background: rgba(108, 138, 255, 0.08);
  border-left-color: var(--accent);
  font-weight: 600;
}
@media (max-width: 860px) {
  .topic-page .topic-layout {
    display: block;
  }
  .topic-page .toc {
    margin-bottom: 1.5rem;
  }
  .topic-page .toc .toc-sticky {
    position: relative;
    top: 0;
    max-height: none;
    padding: 0;
    overflow: visible;
  }
  .topic-page .toc .toc-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text);
  }
  .topic-page .toc .toc-toggle svg {
    transition: transform 0.2s;
  }
  .topic-page .toc .toc-list {
    display: none;
    padding: 0 0.5rem 0.75rem;
  }
  .topic-page .toc .toc-list.open {
    display: block;
  }
  .topic-page .toc .toc-list.open + .toc-toggle svg, .topic-page .toc:has(.toc-list.open) .toc-toggle svg {
    transform: rotate(180deg);
  }
}
.topic-page .section-nav {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.2rem 1.5rem;
  margin-bottom: 1.5rem;
}
.topic-page .section-nav h2 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 0.8rem;
}
.topic-page .section-nav ol {
  margin: 0;
  padding-left: 1.2rem;
}
.topic-page .section-nav ol li {
  padding: 0.35rem 0;
  font-size: 0.9rem;
  color: var(--text);
  border-bottom: 1px solid var(--border);
}
.topic-page .section-nav ol li:last-child {
  border-bottom: none;
}
.topic-page .content-placeholder {
  background: var(--surface);
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 3rem;
  text-align: center;
  margin-top: 2rem;
  color: var(--text-muted);
}
.topic-page .content-placeholder h2 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  color: var(--text);
}
.topic-page .topic-content {
  margin-top: 2rem;
}
.topic-page .topic-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.6rem;
  border-bottom: 2px solid var(--accent);
  color: var(--accent);
}
.topic-page .topic-content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-top: 1.8rem;
  margin-bottom: 0.6rem;
  color: var(--text);
  padding-left: 0.6rem;
  border-left: 3px solid var(--accent);
}
.topic-page .topic-content h4 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-top: 1.2rem;
  margin-bottom: 0.4rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.topic-page .topic-content p {
  margin-bottom: 0.8rem;
  color: var(--text);
  line-height: 1.7;
}
.topic-page .topic-content ul, .topic-page .topic-content ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}
.topic-page .topic-content ul li, .topic-page .topic-content ol li {
  margin-bottom: 0.3rem;
  line-height: 1.6;
}
.topic-page .topic-content .table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 1.2rem 0 1.8rem;
  border-radius: 12px;
  border: 2px solid #3a3f5c;
  background: #13151d;
}
.topic-page .topic-content table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 0.88rem;
  margin: 0;
}
.topic-page .topic-content table th {
  background: #252a3a;
  font-weight: 700;
  color: #fff;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 2px solid var(--accent);
  position: sticky;
  top: 0;
}
.topic-page .topic-content table td {
  padding: 0.7rem 1rem;
  text-align: left;
  vertical-align: top;
  color: var(--text);
  background: transparent;
  border-bottom: 1px solid #1f2333;
}
.topic-page .topic-content table tr:nth-child(odd) td {
  background: rgba(255, 255, 255, 0.02);
}
.topic-page .topic-content table tr:nth-child(even) td {
  background: rgba(108, 138, 255, 0.03);
}
.topic-page .topic-content table tr:hover td {
  background: rgba(108, 138, 255, 0.08);
}
.topic-page .topic-content table tr:last-child td {
  border-bottom: none;
}
.topic-page .topic-content table td:first-child {
  font-weight: 600;
  color: var(--accent);
}
.topic-page .topic-content table td strong {
  color: var(--accent);
}
.topic-page .topic-content code {
  background: var(--surface);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.85em;
  color: var(--accent);
}
.topic-page .topic-content pre {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  overflow-x: auto;
  margin: 1rem 0;
}
.topic-page .topic-content pre code {
  background: none;
  padding: 0;
  color: var(--text);
}
.topic-page .topic-content blockquote {
  border-left: 3px solid var(--accent);
  margin: 1rem 0;
  padding: 0.5rem 1rem;
  background: rgba(108, 138, 255, 0.05);
  border-radius: 0 8px 8px 0;
}
.topic-page .topic-content blockquote p {
  color: var(--text-muted);
  margin-bottom: 0;
}
.topic-page .topic-content .key-term {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.2rem;
  margin: 0.8rem 0;
}
.topic-page .topic-content .key-term strong {
  color: var(--accent);
}
.topic-page .topic-content .key-term strong .key-term-link {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px dashed var(--border);
  transition: border-color 0.2s;
  position: relative;
}
.topic-page .topic-content .key-term strong .key-term-link:hover {
  border-bottom-color: var(--accent);
}
.topic-page .topic-content .key-term strong .key-term-link[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  left: 0;
  top: calc(100% + 6px);
  z-index: 10;
  width: 300px;
  padding: 0.6rem 0.8rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 0.8rem;
  font-weight: 400;
  line-height: 1.5;
  white-space: normal;
  word-wrap: break-word;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s;
}
.topic-page .topic-content .key-term strong .key-term-link[data-tooltip]:hover::after {
  opacity: 1;
}
.topic-page .topic-content .exam-tip {
  background: rgba(255, 217, 61, 0.08);
  border: 1px solid rgba(255, 217, 61, 0.25);
  border-radius: 10px;
  padding: 1rem 1.2rem;
  margin: 1.2rem 0;
}
.topic-page .topic-content .exam-tip::before {
  content: "Exam Tip";
  display: block;
  font-weight: 700;
  font-size: 0.8rem;
  text-transform: uppercase;
  color: var(--a2);
  margin-bottom: 0.4rem;
}
.topic-page .topic-content .exam-tip p {
  margin-bottom: 0;
  color: var(--text);
}
.topic-page .topic-content .diagram {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
  margin: 1.2rem 0;
  text-align: center;
  font-family: "SF Mono", "Menlo", "Consolas", "DejaVu Sans Mono", "Liberation Mono", monospace;
  font-size: 0.8rem;
  white-space: pre;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  line-height: 1.3;
  color: var(--accent);
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
.topic-page .topic-content .mermaid {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
  margin: 1.2rem 0;
  text-align: center;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.topic-page .nav-links {
  display: flex;
  justify-content: space-between;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}
.topic-page .nav-links a {
  padding: 0.5rem 1rem;
  background: var(--surface);
  border-radius: 8px;
  font-size: 0.9rem;
}
.topic-page .nav-links a:hover {
  background: var(--surface-hover);
}

.level-header {
  margin-bottom: 2rem;
}
.level-header h1 {
  font-size: 2rem;
}
.level-header p {
  color: var(--text-muted);
  margin-top: 0.3rem;
}

.units-grid {
  display: grid;
  gap: 1.5rem;
}

.unit-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
}
.unit-card h2 {
  font-size: 1.2rem;
  margin-bottom: 0.3rem;
}
.unit-card .unit-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}
.unit-card .topic-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 0.5rem;
}
.unit-card .topic-list li a {
  display: block;
  padding: 0.5rem 0.8rem;
  background: var(--bg);
  border-radius: 6px;
  font-size: 0.9rem;
}
.unit-card .topic-list li a:hover {
  background: var(--surface-hover);
}

footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
  margin-top: 3rem;
}

@media (max-width: 600px) {
  .site-header {
    padding: 0.8rem 1rem;
  }
  .site-header .header-inner {
    flex-wrap: wrap;
  }
  .site-header nav a {
    margin-left: 0.8rem;
    font-size: 0.8rem;
  }
  .site-header .nav-dropdown {
    margin-left: 0.8rem;
  }
  .site-header .nav-dropdown > a {
    font-size: 0.8rem;
  }
  .container {
    padding: 1rem;
  }
  .hero h1 {
    font-size: 1.6rem;
  }
}
.past-papers-hub {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem;
}
.past-papers-hub .pp-hub-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}
.past-papers-hub .pp-hub-card {
  display: block;
  padding: 1.8rem 1.5rem;
  border-radius: 12px;
  border: 2px solid var(--border);
  background: var(--surface);
  text-decoration: none;
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.15s;
}
.past-papers-hub .pp-hub-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
  transform: translateY(-2px);
}
.past-papers-hub .pp-hub-card .pp-hub-card-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}
.past-papers-hub .pp-hub-card .pp-hub-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.4rem;
}
.past-papers-hub .pp-hub-card .pp-hub-card-count {
  font-size: 0.85rem;
  color: var(--text-muted);
}
.past-papers-hub .pp-hub-card--gcse {
  border-color: var(--gcse);
}
.past-papers-hub .pp-hub-card--gcse .pp-hub-card-label {
  color: var(--gcse);
}
.past-papers-hub .pp-hub-card--gcse:hover {
  border-color: var(--gcse);
}
.past-papers-hub .pp-hub-card--as {
  border-color: var(--as);
}
.past-papers-hub .pp-hub-card--as .pp-hub-card-label {
  color: var(--as);
}
.past-papers-hub .pp-hub-card--as:hover {
  border-color: var(--as);
}
.past-papers-hub .pp-hub-card--a2 {
  border-color: var(--a2);
}
.past-papers-hub .pp-hub-card--a2 .pp-hub-card-label {
  color: var(--a2);
}
.past-papers-hub .pp-hub-card--a2:hover {
  border-color: var(--a2);
}

.past-papers-page .pp-header {
  margin-bottom: 2rem;
}
.past-papers-page .pp-header h1 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
}
.past-papers-page .pp-header p {
  color: var(--text-muted);
  margin-top: 0.3rem;
}
.past-papers-page .pp-controls {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.past-papers-page .pp-filters {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}
.past-papers-page .pp-filter-group {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}
.past-papers-page .pp-filter-group label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  font-weight: 600;
}
.past-papers-page .pp-filter-group select {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem 0.8rem;
  font-size: 0.85rem;
  cursor: pointer;
  outline: none;
  min-width: 140px;
}
.past-papers-page .pp-filter-group select:focus {
  border-color: var(--accent);
}
.past-papers-page .pp-actions {
  display: flex;
  gap: 0.5rem;
}
.past-papers-page .pp-btn {
  background: var(--surface);
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem 0.9rem;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.15s;
}
.past-papers-page .pp-btn:hover {
  color: var(--text);
  border-color: var(--accent);
  background: var(--surface-hover);
}
.past-papers-page .pp-count {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}
.past-papers-page .pp-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 0.6rem;
  overflow: hidden;
  transition: border-color 0.15s;
}
.past-papers-page .pp-card:hover {
  border-color: #3d4466;
}
.past-papers-page .pp-card.open {
  border-color: var(--accent);
}
.past-papers-page .pp-card.open .pp-chevron {
  transform: rotate(180deg);
}
.past-papers-page .pp-card.open .pp-card-body {
  display: block;
}
.past-papers-page .pp-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.8rem 1rem;
  cursor: pointer;
  user-select: none;
  transition: background 0.15s;
}
.past-papers-page .pp-card-header:hover {
  background: var(--surface-hover);
}
.past-papers-page .pp-card-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.past-papers-page .pp-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}
.past-papers-page .pp-badge--paper {
  background: rgba(108, 138, 255, 0.12);
  color: var(--accent);
}
.past-papers-page .pp-badge--topic {
  background: rgba(78, 205, 196, 0.12);
  color: var(--gcse);
  text-transform: capitalize;
}
.past-papers-page .pp-badge--marks {
  background: rgba(255, 217, 61, 0.12);
  color: var(--a2);
}
.past-papers-page .pp-badge--level {
  background: rgba(255, 107, 107, 0.12);
  color: var(--as);
  text-transform: uppercase;
}
.past-papers-page .pp-badge--image {
  background: rgba(255, 107, 107, 0.12);
  color: var(--as);
}
.past-papers-page .pp-qnum {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-left: 0.3rem;
}
.past-papers-page .pp-chevron {
  color: var(--text-muted);
  flex-shrink: 0;
  transition: transform 0.2s;
}
.past-papers-page .pp-card-question {
  padding: 0 1.2rem 0.8rem;
}
.past-papers-page .pp-card-question p {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text);
  margin-bottom: 0.6rem;
}
.past-papers-page .pp-card-question p:last-child {
  margin-bottom: 0;
}
.past-papers-page .pp-card-answer {
  margin-top: 0.5rem;
}
.past-papers-page .pp-answer-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--gcse);
  margin-bottom: 0.5rem;
}
.past-papers-page .pp-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 0.85rem;
  margin: 0.8rem 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.past-papers-page .pp-table th {
  background: #252a3a;
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.6rem 0.8rem;
  text-align: left;
  border-bottom: 2px solid var(--accent);
}
.past-papers-page .pp-table td {
  padding: 0.6rem 0.8rem;
  color: var(--text);
  border-bottom: 1px solid #1f2333;
  vertical-align: top;
}
.past-papers-page .pp-table tr:nth-child(odd) td {
  background: rgba(255, 255, 255, 0.02);
}
.past-papers-page .pp-table tr:nth-child(even) td {
  background: rgba(108, 138, 255, 0.03);
}
.past-papers-page .pp-table tr:last-child td {
  border-bottom: none;
}
.past-papers-page .pp-table td:empty {
  background: rgba(108, 138, 255, 0.06);
  min-width: 60px;
}
.past-papers-page .pp-code {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.8rem 1rem;
  margin: 0.8rem 0;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.6;
}
.past-papers-page .pp-code code {
  font-family: "SF Mono", "Menlo", "Consolas", monospace;
  color: var(--text);
  background: none;
  padding: 0;
}
.past-papers-page .pp-card-body {
  display: none;
  padding: 0 1.2rem 1rem;
}
.past-papers-page .pp-radio-cell {
  text-align: center;
  width: 60px;
}
.past-papers-page .pp-radio-cell input[type=radio] {
  cursor: pointer;
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
}
.past-papers-page tr.pp-correct td {
  background: rgba(78, 205, 196, 0.12) !important;
}
.past-papers-page tr.pp-incorrect td {
  background: rgba(255, 107, 107, 0.1) !important;
}
.past-papers-page .pp-check-btn, .past-papers-page .pp-reveal-btn {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.5rem 1.2rem;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  margin-top: 0.6rem;
  transition: opacity 0.15s;
}
.past-papers-page .pp-check-btn:hover, .past-papers-page .pp-reveal-btn:hover {
  opacity: 0.85;
}
.past-papers-page .pp-reveal-btn {
  background: var(--surface);
  color: var(--accent);
  border: 1px solid var(--accent);
}
.past-papers-page .pp-result {
  font-size: 0.85rem;
  font-weight: 600;
  margin-top: 0.5rem;
  min-height: 1.2em;
}
.past-papers-page .pp-result--correct {
  color: var(--gcse);
}
.past-papers-page .pp-result--partial {
  color: var(--a2);
}
.past-papers-page .pp-word-bank {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.8rem 0;
}
.past-papers-page .pp-word-bank .pp-word-chip {
  display: inline-block;
  background: rgba(108, 138, 255, 0.1);
  border: 1px solid rgba(108, 138, 255, 0.25);
  color: var(--accent);
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 500;
}
.past-papers-page .pp-fill-sentences {
  margin: 0.5rem 0;
}
.past-papers-page .pp-fill-row {
  margin-bottom: 0.5rem;
  padding: 0.4rem 0.6rem;
  border-radius: 6px;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text);
  transition: background 0.15s;
}
.past-papers-page .pp-fill-row.pp-correct {
  background: rgba(78, 205, 196, 0.12);
}
.past-papers-page .pp-fill-row.pp-incorrect {
  background: rgba(255, 107, 107, 0.1);
}
.past-papers-page .pp-fill-select {
  background: var(--surface);
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 6px;
  padding: 0.2rem 0.5rem;
  font-size: 0.85rem;
  cursor: pointer;
  outline: none;
  min-width: 120px;
}
.past-papers-page .pp-mc-options {
  margin: 0.5rem 0;
}
.past-papers-page .pp-mc-label {
  display: block;
  padding: 0.5rem 0.8rem;
  margin-bottom: 0.3rem;
  border-radius: 6px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.15s;
  color: var(--text);
}
.past-papers-page .pp-mc-label:hover {
  background: rgba(108, 138, 255, 0.06);
}
.past-papers-page .pp-mc-label.pp-correct {
  background: rgba(78, 205, 196, 0.15);
}
.past-papers-page .pp-mc-label.pp-incorrect {
  background: rgba(255, 107, 107, 0.12);
}
.past-papers-page .pp-mc-label input {
  margin-right: 0.5rem;
  accent-color: var(--accent);
}
.past-papers-page .pp-tt-input {
  text-align: center;
}
.past-papers-page .pp-tt-input.pp-correct {
  background: rgba(78, 205, 196, 0.15) !important;
}
.past-papers-page .pp-tt-input.pp-incorrect {
  background: rgba(255, 107, 107, 0.12) !important;
}
.past-papers-page .pp-tt-cell {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  width: 2rem;
  height: 1.6rem;
  text-align: center;
  font-size: 0.85rem;
  font-family: "SF Mono", "Menlo", "Consolas", monospace;
  outline: none;
}
.past-papers-page .pp-tt-cell:focus {
  border-color: var(--accent);
}
.past-papers-page .pp-error-item {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.6rem 0.8rem;
  margin-bottom: 0.5rem;
  font-size: 0.85rem;
  line-height: 1.6;
}
.past-papers-page .pp-error-item code {
  background: rgba(108, 138, 255, 0.1);
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
  font-size: 0.82rem;
}
.past-papers-page .pp-answer-content {
  margin-top: 0.6rem;
  border-top: 1px solid var(--border);
  padding-top: 0.6rem;
}
.past-papers-page .pp-answer-text {
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--text);
}
.past-papers-page .pp-badge--type {
  background: rgba(168, 131, 255, 0.12);
  color: #a883ff;
  text-transform: capitalize;
}

@media (max-width: 600px) {
  .past-papers-page .pp-table {
    font-size: 0.78rem;
  }
  .past-papers-page .pp-table th, .past-papers-page .pp-table td {
    padding: 0.4rem 0.5rem;
  }
  .past-papers-page .pp-controls {
    flex-direction: column;
    align-items: stretch;
  }
  .past-papers-page .pp-filters {
    flex-direction: column;
  }
  .past-papers-page .pp-filter-group select {
    width: 100%;
  }
  .past-papers-page .pp-card-meta {
    gap: 0.3rem;
  }
}

/*# sourceMappingURL=style.css.map */