@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700&family=Syne:wght@400;500;600;700;800&display=swap');
@import url('root.css');

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Syne', sans-serif;
  background: var(--dark-bg-primary);
  color: var(--dark-text);
  min-height: 100vh;
  overflow-x: hidden;
  background-image:
    var(--dark-gradient-1),
    var(--dark-gradient-2),
    var(--dark-gradient-3),
    var(--dark-gradient-main);
  background-attachment: fixed;
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--dark-bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--dark-primary-40); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--dark-primary-60); }

/* ===== TOP BAR ===== */
#topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: var(--topbar-dark-bg);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--dark-border);
  padding: 0 2rem;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

#topbar .logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

#topbar .logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--dark-primary), var(--dark-accent));
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
  box-shadow: 0 0 20px var(--dark-primary-30);
}

#topbar .logo-text {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  background: linear-gradient(135deg, var(--dark-text) 0%, var(--dark-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

#topbar .logo-badge {
  font-size: 0.6rem;
  font-family: 'JetBrains Mono', monospace;
  background: var(--dark-primary-20);
  color: var(--dark-secondary);
  border: 1px solid var(--dark-primary-30);
  border-radius: 4px;
  padding: 2px 6px;
  letter-spacing: 0.08em;
}

/* Score bar */
.score-bar {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex: 1;
  justify-content: center;
}

.score-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-family: 'JetBrains Mono', monospace;
}

.score-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
}

.score-dot.correct { background: var(--success-primary); box-shadow: 0 0 8px var(--success-primary); }
.score-dot.wrong { background: var(--error-primary); box-shadow: 0 0 8px var(--error-primary); }
.score-dot.skipped { background: var(--neutral-slate-500); }

.score-label { color: var(--white-50); }
.score-val { color: var(--dark-text); font-weight: 600; }

/* Progress */
.progress-section {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.progress-text {
  font-size: 0.75rem;
  font-family: 'JetBrains Mono', monospace;
  color: var(--white-50);
  white-space: nowrap;
}

.progress-track {
  width: 120px;
  height: 4px;
  background: var(--dark-primary-15);
  border-radius: 2px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--dark-primary), var(--dark-accent));
  border-radius: 2px;
  transition: width 0.4s ease;
  box-shadow: 0 0 8px var(--dark-primary-50);
}

/* ===== LAYOUT ===== */
#app {
  padding-top: 64px;
  display: flex;
  min-height: 100vh;
}

/* ===== SIDEBAR ===== */
#sidebar {
  width: 300px;
  flex-shrink: 0;
  position: sticky;
  top: 64px;
  height: calc(100vh - 64px);
  overflow-y: auto;
  background: var(--sidebar-dark-bg);
  border-right: 1px solid var(--dark-border);
  display: flex;
  flex-direction: column;
}

.sidebar-header {
  padding: 1.25rem 1.25rem 1rem;
  border-bottom: 1px solid var(--dark-border);
}

.sidebar-title {
  font-size: 0.7rem;
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.12em;
  color: var(--dark-secondary);
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.filter-tabs {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.filter-tab {
  font-size: 0.65rem;
  font-family: 'JetBrains Mono', monospace;
  padding: 4px 8px;
  border-radius: 4px;
  border: 1px solid var(--dark-border);
  background: transparent;
  color: var(--white-50);
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 0.05em;
}

.filter-tab:hover { border-color: var(--dark-primary-40); color: var(--dark-secondary); }
.filter-tab.active { background: var(--dark-primary-20); border-color: var(--dark-primary); color: var(--dark-text); }

/* Category filter */
.category-filters {
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--dark-border);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.cat-filter-label {
  font-size: 0.65rem;
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.1em;
  color: var(--white-30);
  margin-bottom: 0.25rem;
}

.cat-btn {
  font-size: 0.7rem;
  padding: 5px 8px;
  border-radius: 5px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--white-50);
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: 'Syne', sans-serif;
}

.cat-btn:hover { background: var(--dark-primary-08); color: var(--dark-text); border-color: var(--dark-border); }
.cat-btn.active { background: var(--dark-primary-15); color: var(--dark-secondary); border-color: var(--dark-primary-30); }
.cat-btn span { font-family: 'JetBrains Mono', monospace; font-size: 0.65rem; color: var(--white-30); }

/* Q Grid */
.q-grid-container {
  padding: 1rem 1.25rem;
  flex: 1;
}

.q-grid-label {
  font-size: 0.65rem;
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.1em;
  color: var(--white-30);
  margin-bottom: 0.6rem;
}

.q-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 4px;
}

.q-dot {
  aspect-ratio: 1;
  border-radius: 4px;
  border: 1px solid var(--dark-border);
  background: var(--dark-primary-05);
  cursor: pointer;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.55rem;
  font-family: 'JetBrains Mono', monospace;
  color: var(--white-30);
  position: relative;
}

.q-dot:hover { border-color: var(--dark-primary-60); background: var(--dark-primary-15); color: var(--dark-text); transform: scale(1.1); }
.q-dot.active { border-color: var(--dark-primary); background: var(--dark-primary-25); color: var(--dark-text); box-shadow: 0 0 8px var(--dark-primary-40); }
.q-dot.correct { border-color: var(--success-border); background: var(--success-light); color: var(--success-primary); }
.q-dot.wrong { border-color: var(--error-border); background: var(--error-light); color: var(--error-primary); }
.q-dot.skipped { border-color: var(--neutral-border); background: var(--neutral-bg-light); color: var(--neutral-slate-400); }

/* ===== MAIN ===== */
#main {
  flex: 1;
  padding: 2.5rem 2.5rem 5rem;
  max-width: 860px;
  margin: 0 auto;
  width: 100%;
}

/* ===== QUESTION CARD ===== */
.q-card {
  background: var(--white-03);
  border: 1px solid var(--dark-border);
  border-radius: 16px;
  overflow: hidden;
  animation: cardIn 0.3s ease;
  box-shadow: 0 8px 32px var(--dark-shadow);
}

@keyframes cardIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.q-card-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--dark-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: var(--dark-primary-05);
}

.q-number {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--dark-secondary);
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.q-number::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--dark-primary);
  box-shadow: 0 0 8px var(--dark-primary);
}

.q-category-tag {
  font-size: 0.65rem;
  font-family: 'JetBrains Mono', monospace;
  padding: 3px 10px;
  border-radius: 20px;
  background: var(--dark-primary-12);
  border: 1px solid var(--dark-primary-25);
  color: var(--dark-secondary);
  letter-spacing: 0.04em;
}

.q-body {
  padding: 1.75rem 1.5rem 1.25rem;
}

.q-text {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--white-90);
  margin-bottom: 1.5rem;
  white-space: pre-wrap;
  word-break: break-word;
}

/* Code blocks inside questions */
.q-text code, .q-code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  background: var(--dark-primary-08);
  border: 1px solid var(--dark-primary-20);
  border-radius: 6px;
  padding: 0.6rem 0.8rem;
  display: block;
  margin: 0.75rem 0;
  color: var(--dark-accent-2);
  overflow-x: auto;
  line-height: 1.5;
}

/* ===== OPTIONS ===== */
.options-grid {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 1.5rem;
}

.option-btn {
  display: flex;
  align-items: flex-start;
  gap: 0.9rem;
  padding: 0.85rem 1.1rem;
  border-radius: 10px;
  border: 1px solid var(--dark-border);
  background: var(--white-03);
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: left;
  width: 100%;
  position: relative;
  overflow: hidden;
}

.option-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--dark-primary-08), transparent);
  opacity: 0;
  transition: opacity 0.2s;
}

.option-btn:hover::before { opacity: 1; }
.option-btn:hover { border-color: var(--dark-primary-40); transform: translateX(2px); }

.option-btn:disabled { cursor: default; transform: none; }

.option-letter {
  width: 28px; height: 28px;
  border-radius: 7px;
  border: 1px solid var(--dark-border);
  background: var(--dark-primary-10);
  display: flex; align-items: center; justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--dark-secondary);
  flex-shrink: 0;
  transition: all 0.2s;
}

.option-text {
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--white-80);
  padding-top: 4px;
  flex: 1;
}

/* Selected state */
.option-btn.selected {
  border-color: var(--dark-primary-60);
  background: var(--dark-primary-12);
}
.option-btn.selected .option-letter {
  background: var(--dark-primary);
  border-color: var(--dark-primary);
  color: var(--dark-text);
}

/* Correct/Wrong after reveal */
.option-btn.correct-answer {
  border-color: var(--success-border);
  background: var(--success-light);
  animation: correctPulse 0.4s ease;
}
.option-btn.correct-answer .option-letter {
  background: var(--success-primary);
  border-color: var(--success-primary);
  color: #000;
}
.option-btn.correct-answer .option-text { color: var(--success-primary); }

.option-btn.wrong-answer {
  border-color: var(--error-border);
  background: var(--error-light);
  animation: shake 0.4s ease;
}
.option-btn.wrong-answer .option-letter {
  background: var(--error-primary);
  border-color: var(--error-primary);
  color: #fff;
}
.option-btn.wrong-answer .option-text { color: var(--error-primary); }

@keyframes correctPulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.01); box-shadow: 0 0 20px var(--success-shadow); }
  100% { transform: scale(1); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}

/* ===== RESULT BANNER ===== */
.result-banner {
  padding: 0.9rem 1.2rem;
  border-radius: 10px;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 1rem;
  animation: fadeIn 0.3s ease;
}

.result-banner.correct {
  background: var(--success-light);
  border: 1px solid var(--success-border);
  color: var(--success-primary);
}

.result-banner.wrong {
  background: var(--error-light);
  border: 1px solid var(--error-border);
  color: var(--error-primary);
}

.result-banner .icon { font-size: 1.1rem; }
.result-banner .answer-reveal {
  margin-left: auto;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  opacity: 0.8;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== ACTION BAR ===== */
.action-bar {
  padding: 1rem 1.5rem 1.25rem;
  border-top: 1px solid var(--dark-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: var(--dark-primary-03, rgba(147,51,234,0.03));
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  border: 1px solid transparent;
  font-family: 'Syne', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  letter-spacing: 0.02em;
}

.btn-primary {
  background: linear-gradient(135deg, var(--dark-primary), var(--dark-600));
  color: var(--dark-text);
  border-color: var(--dark-primary-40);
  box-shadow: 0 4px 16px var(--dark-primary-20);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 24px var(--dark-primary-40); }
.btn-primary:active { transform: translateY(0); }

.btn-ghost {
  background: transparent;
  color: var(--white-50);
  border-color: var(--dark-border);
}
.btn-ghost:hover { background: var(--white-05); border-color: var(--dark-primary-30); color: var(--dark-text); }

.btn-submit {
  background: linear-gradient(135deg, var(--dark-accent-3), #059669);
  color: #fff;
  border-color: rgba(16,185,129,0.4);
  box-shadow: 0 4px 16px rgba(16,185,129,0.2);
}
.btn-submit:hover { transform: translateY(-1px); box-shadow: 0 6px 24px rgba(16,185,129,0.35); }

.btn-skip {
  background: transparent;
  color: var(--neutral-slate-400);
  border-color: var(--neutral-border);
  font-size: 0.8rem;
}
.btn-skip:hover { color: var(--warning-primary); border-color: var(--warning-border); background: var(--warning-light); }

.btn-clear-answer {
  background: transparent;
  color: var(--warning-primary);
  border: 1px solid var(--warning-border);
  font-size: 0.8rem;
  font-family: 'JetBrains Mono', monospace;
}
.btn-clear-answer:hover {
  background: var(--warning-light);
  border-color: var(--warning-strong);
  color: var(--warning-primary);
  transform: translateY(-1px);
}
.btn-clear-answer:active { transform: translateY(0); }

.btn:disabled { opacity: 0.4; cursor: not-allowed; transform: none !important; box-shadow: none !important; }

/* ===== FINAL SUMMARY CARD ===== */
.summary-card {
  background: var(--white-03);
  border: 1px solid var(--dark-border);
  border-radius: 20px;
  padding: 3rem 2.5rem;
  text-align: center;
  animation: cardIn 0.4s ease;
}

.summary-title {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, var(--dark-text) 0%, var(--dark-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.summary-subtitle {
  font-size: 0.85rem;
  color: var(--white-40);
  margin-bottom: 2.5rem;
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.05em;
}

.summary-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.stat-card {
  border-radius: 12px;
  padding: 1.25rem;
  border: 1px solid;
}

.stat-card.total { background: var(--dark-primary-10); border-color: var(--dark-primary-25); }
.stat-card.correct-s { background: var(--success-light); border-color: var(--success-border); }
.stat-card.wrong-s { background: var(--error-light); border-color: var(--error-border); }

.stat-num {
  font-size: 2.2rem;
  font-weight: 800;
  font-family: 'JetBrains Mono', monospace;
  margin-bottom: 0.25rem;
}

.stat-card.total .stat-num { color: var(--dark-secondary); }
.stat-card.correct-s .stat-num { color: var(--success-primary); }
.stat-card.wrong-s .stat-num { color: var(--error-primary); }

.stat-label {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  opacity: 0.6;
  text-transform: uppercase;
  font-family: 'JetBrains Mono', monospace;
}

.score-pct {
  font-size: 4rem;
  font-weight: 800;
  font-family: 'JetBrains Mono', monospace;
  margin: 1rem 0;
}

.score-pct.pass { color: var(--success-primary); text-shadow: 0 0 40px var(--success-shadow); }
.score-pct.fail { color: var(--error-primary); text-shadow: 0 0 40px var(--error-shadow); }

.pass-label {
  font-size: 0.85rem;
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.1em;
  margin-bottom: 2rem;
}
.pass-label.pass { color: var(--success-primary); }
.pass-label.fail { color: var(--error-primary); }

.summary-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== EMPTY STATE ===== */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--white-30);
}
.empty-state .icon { font-size: 3rem; margin-bottom: 1rem; }
.empty-state p { font-size: 0.9rem; }

/* ===== TOAST ===== */
#toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}

.toast-item {
  font-size: 0.8rem;
  font-family: 'JetBrains Mono', monospace;
  padding: 0.6rem 1rem;
  border-radius: 8px;
  border: 1px solid;
  backdrop-filter: blur(10px);
  animation: toastIn 0.3s ease, toastOut 0.3s ease 2.7s forwards;
  pointer-events: none;
}

.toast-item.info { background: var(--info-light); border-color: var(--info-border); color: var(--info-primary); }
.toast-item.success { background: var(--success-light); border-color: var(--success-border); color: var(--success-primary); }

@keyframes toastIn { from { opacity: 0; transform: translateX(20px); } to { opacity: 1; transform: translateX(0); } }
@keyframes toastOut { from { opacity: 1; transform: translateX(0); } to { opacity: 0; transform: translateX(20px); } }


/* ===== RESET MODAL ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: var(--black-70);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: all;
}

.modal-box {
  background: var(--dark-bg-secondary);
  border: 1px solid var(--dark-primary-25);
  border-radius: 20px;
  padding: 2.5rem 2rem 2rem;
  max-width: 420px;
  width: 100%;
  text-align: center;
  box-shadow: 0 24px 80px var(--dark-primary-30), 0 0 0 1px var(--dark-primary-10);
  transform: translateY(20px) scale(0.96);
  transition: transform 0.25s ease;
  position: relative;
  overflow: hidden;
}

.modal-box::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--error-primary), var(--accent-1-500), var(--dark-primary));
}

.modal-overlay.open .modal-box {
  transform: translateY(0) scale(1);
}

.modal-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  filter: drop-shadow(0 0 16px var(--error-shadow));
}

.modal-title {
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin-bottom: 0.75rem;
  background: linear-gradient(135deg, var(--dark-text) 0%, var(--error-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.modal-desc {
  font-size: 0.83rem;
  color: var(--white-50);
  line-height: 1.65;
  margin-bottom: 2rem;
  font-family: 'JetBrains Mono', monospace;
}

.modal-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
}

.modal-cancel {
  flex: 1;
}

.btn-danger {
  flex: 1;
  background: linear-gradient(135deg, var(--error-primary), var(--error-secondary));
  color: var(--white);
  border-color: var(--error-primary-40, rgba(239,68,68,0.4));
  box-shadow: 0 4px 16px var(--error-shadow);
  font-family: 'Syne', sans-serif;
  font-weight: 700;
}

.btn-danger:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 24px var(--error-shadow);
  background: linear-gradient(135deg, var(--urgent-red), var(--urgent-dark-red));
}

.btn-danger:active {
  transform: translateY(0);
}
.reset-all-btn {
  background: transparent;
  border: 1px solid var(--dark-primary-20);
  color: var(--white-50);
  padding: 6px 14px;
  border-radius: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
  flex-shrink: 0;
}

.reset-all-btn:hover {
  border-color: #ef4444;
  color: #ef4444;
  background: rgba(239,68,68,0.08);
}

/* ===== IMAGE DATA BLOCK ===== */
.q-image-data {
  margin: 0 0 1.5rem 0;
  padding: 1rem 1.1rem;
  background: var(--dark-primary-05);
  border: 1px solid var(--dark-primary-20);
  border-left: 3px solid var(--dark-accent-2);
  border-radius: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  color: var(--white-80);
  line-height: 1.6;
}

.img-data-line {
  white-space: pre-wrap;
  word-break: break-word;
  min-height: 1.2em;
}

.q-table {
  width: 100%;
  border-collapse: collapse;
  margin: 0.5rem 0;
  font-size: 0.75rem;
}

.q-table th {
  background: var(--dark-primary-20);
  color: var(--dark-secondary);
  padding: 5px 8px;
  text-align: left;
  border: 1px solid var(--dark-primary-30);
  font-weight: 600;
  letter-spacing: 0.03em;
}

.q-table td {
  padding: 4px 8px;
  border: 1px solid var(--dark-primary-15);
  color: var(--white-80);
  vertical-align: top;
}

.q-table tr:nth-child(even) td {
  background: var(--dark-primary-05);
}


.q-multi-badge {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 4px;
  background: linear-gradient(135deg, var(--dark-accent-2), var(--dark-primary));
  color: var(--dark-text);
  border: 1px solid var(--dark-primary-30);
  white-space: nowrap;
}

.option-btn.multi { padding-left: 0.85rem; }

.option-checkbox {
  width: 18px; height: 18px;
  border-radius: 5px;
  border: 1.5px solid var(--dark-primary-40);
  background: var(--dark-primary-08);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  margin-top: 5px;
  transition: all 0.2s;
}
.option-checkbox svg {
  width: 10px; height: 8px;
  color: var(--dark-text);
  opacity: 0;
  transition: opacity 0.15s;
}
.option-btn.multi.selected .option-checkbox {
  background: var(--dark-primary);
  border-color: var(--dark-primary);
}
.option-btn.multi.selected .option-checkbox svg { opacity: 1; }
.option-btn.multi.correct-answer .option-checkbox {
  background: var(--success-primary);
  border-color: var(--success-primary);
}
.option-btn.multi.correct-answer .option-checkbox svg { opacity: 1; color: #000; }
.option-btn.multi.wrong-answer .option-checkbox {
  background: var(--error-primary);
  border-color: var(--error-primary);
}
.option-btn.multi.wrong-answer .option-checkbox svg { opacity: 1; color: #fff; }

/* ===== LOADING ===== */
#loading {
  position: fixed;
  inset: 0;
  background: var(--dark-bg-primary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  gap: 1rem;
  transition: opacity 0.5s ease;
}

.loader {
  width: 48px; height: 48px;
  border: 3px solid var(--dark-primary-20);
  border-top-color: var(--dark-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.loading-text {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: var(--dark-secondary);
  letter-spacing: 0.1em;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  #sidebar { width: 240px; }
  #main { padding: 1.5rem 1.5rem 5rem; }
}

@media (max-width: 680px) {
  #sidebar { display: none; }
  .score-bar { gap: 0.75rem; }
  .progress-track { width: 80px; }
  #main { padding: 1.25rem 1rem 5rem; }
  .summary-stats { grid-template-columns: 1fr; }
  #topbar { padding: 0 1rem; }
  .q-grid { grid-template-columns: repeat(6, 1fr); }
}