/* Cambridge Score Calculator – site-wide styles */
*, *::before, *::after { box-sizing: border-box; }

/* Navigation */
.nav-dropdown { position: relative; }
.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  min-width: 220px;
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  box-shadow: 0 8px 30px rgba(0,0,0,.12);
  padding: 6px;
  z-index: 100;
}
/* nav-dropdown open state controlled by nav.js via inline style */
.nav-dropdown-menu a {
  display: block;
  padding: 8px 14px;
  border-radius: 8px;
  font-size: .875rem;
  color: #374151;
  text-decoration: none;
  white-space: nowrap;
}
.nav-dropdown-menu a:hover { background: #f3f4f6; color: #111827; }

/* Prose / content */
.prose h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: #111827;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: .5rem;
  border-bottom: 2px solid #e5e7eb;
}
.prose h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: #1e3a5f;
  margin-top: 1.5rem;
  margin-bottom: .5rem;
}
.prose p { color: #374151; line-height: 1.75; margin-bottom: 1rem; }
.prose ul { list-style: disc; padding-left: 1.5rem; color: #374151; }
.prose ul li { margin-bottom: .35rem; }
.prose ol { list-style: decimal; padding-left: 1.5rem; color: #374151; }
.prose ol li { margin-bottom: .35rem; }
.prose a { color: #b8960a; text-decoration: underline; }
.prose a:hover { color: #fed114; }
.prose strong { color: #111827; }

/* Marks table */
.marks-table { width: 100%; border-collapse: collapse; font-size: .9rem; margin-top: 1rem; }
.marks-table th {
  background: #1e3a5f;
  color: white;
  padding: 10px 14px;
  text-align: left;
  font-weight: 600;
}
.marks-table th:last-child, .marks-table td:last-child { text-align: center; }
.marks-table td { padding: 9px 14px; border-bottom: 1px solid #e5e7eb; color: #374151; }
.marks-table tr:nth-child(even) td { background: #f9fafb; }
.marks-table tfoot td {
  font-weight: 700;
  color: #111827;
  border-top: 2px solid #e5e7eb;
  background: #f3f4f6;
}

/* Grade table */
.grade-table { width: 100%; border-collapse: collapse; font-size: .9rem; margin-top: 1rem; }
.grade-table th {
  background: #1e3a5f;
  color: white;
  padding: 10px 14px;
  text-align: left;
  font-weight: 600;
}
.grade-table td { padding: 8px 14px; border-bottom: 1px solid #e5e7eb; }
.grade-table .pass { color: #15803d; font-weight: 600; }
.grade-table .fail { color: #b91c1c; }
.grade-table .nr { color: #9ca3af; }

/* FAQ */
.faq-item { border: 1px solid #e5e7eb; border-radius: 12px; overflow: hidden; margin-bottom: .75rem; }
.faq-question {
  width: 100%;
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  font-size: 1rem;
  font-weight: 600;
  color: #111827;
  text-align: left;
  gap: 12px;
  /* Reset heading margins when used as H3 */
  margin: 0;
  line-height: 1.4;
}
.faq-question:hover { background: #f9fafb; }
.faq-answer { display: none; padding: 0 20px 16px; color: #374151; line-height: 1.7; }
.faq-item.open .faq-answer { display: block; }
.faq-chevron { flex-shrink: 0; transition: transform .2s; }
.faq-item.open .faq-chevron { transform: rotate(180deg); }

/* Table of Contents – light mode */
#toc-container { }
.toc-nav {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 16px;
  padding: 20px 24px;
  margin-top: 1.5rem;
  margin-bottom: 2rem;
}
.toc-title {
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: #94a3b8;
  margin: 0 0 12px 0;
}
.toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.toc-h2-item {
  margin-bottom: 6px;
}
.toc-h2-link {
  display: block;
  color: #1e3a5f !important;
  text-decoration: none !important;
  font-size: .9rem;
  font-weight: 500;
  line-height: 1.4;
  padding: 2px 0;
  transition: color .15s;
}
.toc-h2-link:hover { color: #111827 !important; }
.toc-sub-list {
  list-style: none;
  margin: 4px 0 4px 16px;
  padding: 0 0 0 12px;
  border-left: 2px solid #e2e8f0;
}
.toc-h3-item {
  margin-bottom: 4px;
}
.toc-h3-link {
  display: block;
  color: #64748b !important;
  text-decoration: none !important;
  font-size: .82rem;
  line-height: 1.4;
  padding: 1px 0;
  transition: color .15s;
}
.toc-h3-link:hover { color: #374151 !important; }

/* Mobile nav */
#mobile-menu { display: none; }
#mobile-menu.open { display: block; }
@media (max-width: 768px) {
  .desktop-nav { display: none !important; }
  #mobile-toggle { display: flex !important; }
}

/* Dark mode – site chrome
   Use `background` shorthand (not background-color) so it resets
   Tailwind's gradient background-image too. */
.dark body {
  background: #0f172a !important;
  color: #e2e8f0 !important;
}
.dark header {
  background: #0f172a !important;
  border-color: #1e293b !important;
}
.dark header .font-bold { color: #f1f5f9 !important; }
.dark header .text-slate-500 { color: #94a3b8 !important; }
.dark .desktop-nav a,
.dark .desktop-nav button { color: #94a3b8 !important; }
.dark .desktop-nav a:hover,
.dark .desktop-nav button:hover { color: #f1f5f9 !important; }
.dark .nav-dropdown-menu { background: #1e293b !important; border-color: #334155 !important; }
.dark .nav-dropdown-menu a { color: #cbd5e1 !important; }
.dark .nav-dropdown-menu a:hover { background: #334155 !important; color: #f1f5f9 !important; }
.dark #mobile-menu { background: #0f172a !important; border-color: #1e293b !important; }
.dark #mobile-menu a,
.dark #mobile-menu p,
.dark #mobile-menu button { color: #94a3b8 !important; }
.dark #mobile-menu a:hover { color: #f1f5f9 !important; }
.dark #mobile-toggle { border-color: #334155 !important; color: #94a3b8 !important; }

/* Logo badge – stays white in both light and dark mode */
.logo-badge { background: white; }

/* Dark mode toggle button */
.dark-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid #cbd5e1;
  background: none;
  cursor: pointer;
  color: #64748b;
  transition: background .15s, color .15s, border-color .15s;
  flex-shrink: 0;
}
.dark-toggle:hover { background: #f1f5f9; color: #1e293b; }
.dark .dark-toggle { border-color: #475569; color: #94a3b8; }
.dark .dark-toggle:hover { background: #1e293b; color: #f1f5f9; }

/* Dark mode – main content area */
.dark main { background: transparent !important; }
.dark .prose h1 { color: #f1f5f9 !important; }
.dark .prose h2 { color: #f1f5f9 !important; border-color: #334155 !important; }
.dark .prose h3 { color: #93c5fd !important; }
.dark .prose p { color: #cbd5e1 !important; }
.dark .prose ul,
.dark .prose ol { color: #cbd5e1 !important; }
.dark .prose li { color: #cbd5e1 !important; }
.dark .prose a { color: #fed114 !important; }
.dark .prose a:hover { color: #fde047 !important; }
.dark .prose strong { color: #f1f5f9 !important; }
/* breadcrumb */
.dark nav[aria-label="Breadcrumb"] a,
.dark nav[aria-label="Breadcrumb"] span { color: #64748b !important; }
/* section headings outside .prose */
.dark h1, .dark h2.text-2xl { color: #f1f5f9 !important; }

/* Dark mode – marks & grade tables */
.dark .marks-table { background: transparent; }
.dark .marks-table th { background: #1e293b !important; }
.dark .marks-table td { color: #cbd5e1 !important; border-color: #334155 !important; background: transparent; }
.dark .marks-table tr:nth-child(even) td { background: #1e293b !important; }
.dark .marks-table tfoot td { background: #1e293b !important; color: #f1f5f9 !important; border-color: #334155 !important; }
.dark .grade-table th { background: #1e293b !important; }
.dark .grade-table td { border-color: #334155 !important; color: #cbd5e1 !important; }
.dark .overflow-x-auto { background: transparent !important; }

/* Dark mode – FAQ */
.dark .faq-item { border-color: #334155 !important; background: transparent !important; }
.dark .faq-question { color: #f1f5f9 !important; background: transparent !important; }
.dark .faq-question:hover { background: #1e293b !important; }
.dark .faq-answer { color: #cbd5e1 !important; }

/* Dark mode – TOC */
.dark .toc-nav { background: #1e293b; border-color: #334155; }
.dark .toc-title { color: #475569; }
.dark .toc-h2-link { color: #e2e8f0 !important; }
.dark .toc-h2-link:hover { color: #fff !important; }
.dark .toc-sub-list { border-color: #334155; }
.dark .toc-h3-link { color: #94a3b8 !important; }
.dark .toc-h3-link:hover { color: #cbd5e1 !important; }

/* Dark mode – homepage cards & general utilities */
.dark .bg-white { background: #1e293b !important; }
.dark .bg-slate-50 { background: #162032 !important; }
.dark .bg-slate-100 { background: #1e293b !important; }
.dark .text-slate-900 { color: #f1f5f9 !important; }
.dark .text-slate-800 { color: #e2e8f0 !important; }
.dark .text-slate-700 { color: #cbd5e1 !important; }
.dark .text-slate-600 { color: #94a3b8 !important; }
.dark .text-slate-500 { color: #64748b !important; }
.dark .text-slate-400 { color: #475569 !important; }
.dark .border-slate-200 { border-color: #334155 !important; }
.dark .border-slate-100 { border-color: #1e293b !important; }
.dark .shadow-sm { box-shadow: 0 1px 3px rgba(0,0,0,.4) !important; }
.dark footer { background: #0a1120 !important; border-color: #1e293b !important; color: #94a3b8 !important; }
.dark footer a { color: #94a3b8 !important; }
.dark footer a:hover { color: #f1f5f9 !important; }
/* Keep footer description text at light-mode slate-400 brightness in dark mode */
.dark footer .text-slate-400 { color: #94a3b8 !important; }

/* ── Language Switcher ───────────────────────────────────────── */
.lang-switcher { position: relative; display: inline-flex; }
.lang-btn { display: flex; align-items: center; gap: 3px; padding: 4px 8px; border-radius: 8px; border: 1px solid #d1d5db; font-size: 0.8125rem; font-weight: 500; color: #374151; cursor: pointer; background: transparent; line-height: 1; }
.lang-btn:hover { background: #f3f4f6; border-color: #9ca3af; }
.lang-menu { display: none; position: absolute; top: calc(100% + 4px); right: 0; min-width: 130px; background: white; border: 1px solid #e5e7eb; border-radius: 10px; box-shadow: 0 8px 24px rgba(0,0,0,.1); padding: 4px; z-index: 200; }
/* lang-switcher open state controlled by nav.js via inline style */
.lang-menu a { display: flex; align-items: center; gap: 8px; padding: 7px 12px; border-radius: 7px; font-size: 0.875rem; color: #374151; text-decoration: none; white-space: nowrap; }
.lang-menu a:hover { background: #f3f4f6; color: #111827; }
.dark .lang-btn { border-color: #4b5563; color: #d1d5db; }
.dark .lang-btn:hover { background: #1f2937; border-color: #6b7280; }
.dark .lang-menu { background: #1f2937; border-color: #374151; box-shadow: 0 8px 24px rgba(0,0,0,.4); }
.dark .lang-menu a { color: #d1d5db; }
.dark .lang-menu a:hover { background: #374151; color: #f9fafb; }

/* Prev/Next navigation links */
.nav-link { color: #b8960a !important; }
.nav-link:hover { color: #fed114 !important; }
.dark .nav-link { color: #fed114 !important; }
.dark .nav-link:hover { color: #fde047 !important; }

/* ── Score Converter Widget ──────────────────────────────────── */
.score-converter {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 16px;
  padding: 24px;
  margin-top: 1.25rem;
}
/* Tab switcher */
.conv-tabs {
  display: flex;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  overflow: hidden;
  margin-bottom: 22px;
}
.conv-tab {
  flex: 1;
  padding: 10px 16px;
  font-size: .875rem;
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  color: #6b7280;
  background: transparent;
  transition: background .15s, color .15s;
  user-select: none;
}
.conv-tab + .conv-tab { border-left: 1px solid #e5e7eb; }
.conv-tab input[type="radio"] { display: none; }
.conv-tab.active { background: #1e3a5f; color: #fff; }
.conv-tab.active + .conv-tab { border-left-color: #1e3a5f; }
/* 2-row × 4-col grid: labels row then fields row, all items same height */
.conv-grid {
  display: grid;
  grid-template-columns: 1fr 44px 1fr auto;
  gap: 5px 10px;
  align-items: stretch;
}
.conv-spacer { /* empty placeholder for swap-button & grade columns in label row */ }
.conv-label {
  font-size: .75rem;
  font-weight: 700;
  color: #6b7280;
  text-transform: uppercase;
  letter-spacing: .06em;
  align-self: end;
  padding-bottom: 3px;
}
.conv-input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 500;
  color: #111827;
  background: #f9fafb;
  outline: none;
  transition: border-color .15s, background .15s;
  -moz-appearance: textfield;
  box-sizing: border-box;
}
.conv-input::-webkit-inner-spin-button,
.conv-input::-webkit-outer-spin-button { -webkit-appearance: none; margin: 0; }
.conv-input:focus { border-color: #1e3a5f; background: #fff; }
.conv-output {
  padding: 10px 12px;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  color: #111827;
  background: #f3f4f6;
  display: flex;
  align-items: center;
}
/* Swap button — fills its 44px grid cell, same height as fields row */
.conv-swap-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  border-radius: 8px;
  border: 1px solid #e5e7eb;
  background: #fff;
  color: #9ca3af;
  cursor: pointer;
  padding: 0;
  transition: background .15s, color .15s, border-color .15s;
}
.conv-swap-btn:hover { background: #f3f4f6; color: #1e3a5f; border-color: #c7d2fe; }
/* Grade badge — fills its auto grid cell, same height as fields row */
.conv-grade-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 14px;
  border-radius: 6px;
  font-size: .82rem;
  font-weight: 700;
  white-space: nowrap;
}
/* Grade colour variants – light mode */
.conv-grade-a    { background: #d1fae5; color: #065f46; }
.conv-grade-b    { background: #dbeafe; color: #1e40af; }
.conv-grade-c    { background: #e0f2fe; color: #075985; }
.conv-grade-a1   { background: #fef9c3; color: #713f12; }
.conv-grade-below { background: #fee2e2; color: #991b1b; }
.conv-grade-nr   { background: #f3f4f6; color: #6b7280; }
/* Dark mode – converter shell */
.dark .score-converter { background: #1e293b; border-color: #334155; }
.dark .conv-tabs { border-color: #334155; }
.dark .conv-tab { color: #94a3b8; }
.dark .conv-tab + .conv-tab { border-left-color: #334155; }
.dark .conv-tab.active { background: #1e3a5f; color: #fff; }
.dark .conv-tab.active + .conv-tab { border-left-color: #1e3a5f; }
.dark .conv-label { color: #94a3b8; }
.dark .conv-input { background: #0f172a; border-color: #334155; color: #f1f5f9; }
.dark .conv-input:focus { border-color: #3b82f6; background: #0f172a; }
.dark .conv-output { background: #0f172a; border-color: #334155; color: #f1f5f9; }
.dark .conv-swap-btn { background: #0f172a; border-color: #334155; color: #475569; }
.dark .conv-swap-btn:hover { background: #1e293b; color: #e2e8f0; border-color: #475569; }
/* Grade colour variants – dark mode */
.dark .conv-grade-a    { background: #064e3b; color: #6ee7b7; }
.dark .conv-grade-b    { background: #1e3a8a; color: #93c5fd; }
.dark .conv-grade-c    { background: #075985; color: #7dd3fc; }
.dark .conv-grade-a1   { background: #78350f; color: #fde68a; }
.dark .conv-grade-below { background: #7f1d1d; color: #fca5a5; }
.dark .conv-grade-nr   { background: #1e293b; color: #94a3b8; }
/* Dark mode – exam/converter card hover effects
   Uses CSS custom property --hc set inline on each card <a> element.
   This avoids Tailwind CDN's CSS.escape() mangling of # in class names. */
.dark a.group:hover {
  border-color: var(--hc) !important;
  box-shadow: 0 10px 25px rgba(0,0,0,.5) !important;
}
.dark .group:hover .card-title { color: var(--hc) !important; }

/* Mobile: single column, correct label–field order via flex order */
@media (max-width: 540px) {
  .conv-grid { display: flex; flex-direction: column; gap: 5px; }
  .conv-spacer, .conv-swap-btn { display: none; }
  .conv-label-in  { order: 1; }
  .conv-input     { order: 2; }
  .conv-label-out { order: 3; }
  .conv-output    { order: 4; }
  .conv-grade-badge { order: 5; justify-content: center; }
}