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

:root {
  --primary: #2563EB;
  --primary-light: #60A5FA;
  --primary-dark: #1D4ED8;
  --primary-bg: #EFF6FF;
  --secondary: #7C3AED;
  --accent: #F59E0B;
  --success: #10B981;
  --danger: #DC2626;
  --gray-50: #F8FAFC;
  --gray-100: #F1F5F9;
  --gray-200: #E2E8F0;
  --gray-300: #CBD5E1;
  --gray-400: #94A3B8;
  --gray-500: #64748B;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1E293B;
  --gray-900: #0F172A;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 2px 4px rgba(37,99,235,.08), 0 4px 8px rgba(37,99,235,.06);
  --shadow-lg: 0 4px 12px rgba(37,99,235,.1), 0 8px 24px rgba(37,99,235,.08);
  --shadow-xl: 0 8px 30px rgba(37,99,235,.12), 0 12px 40px rgba(37,99,235,.08);
  --transition: all .2s ease;
}

html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: 'Atkinson Hyperlegible', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--gray-50);
  color: var(--gray-800);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Crimson Pro', Georgia, 'Times New Roman', serif;
  font-weight: 700;
  letter-spacing: -.02em;
}

::selection { background: var(--primary); color: #fff; }

#app {
  display: flex;
  min-height: 100vh;
}

/* SIDEBAR */
.sidebar {
  width: 240px;
  background: var(--gray-900);
  color: #fff;
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 50;
  overflow-y: auto;
}

.sidebar-header {
  padding: 24px 20px 16px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -.03em;
  font-family: 'Crimson Pro', serif;
}
.logo span { color: var(--primary-light); }
.subtitle {
  font-size: .8rem;
  color: var(--gray-400);
  margin-top: 2px;
}

.nav { flex: 1; padding: 12px 10px; display: flex; flex-direction: column; gap: 2px; }

.nav-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--gray-400);
  font-size: .9rem;
  cursor: pointer;
  transition: var(--transition);
  text-align: left;
  width: 100%;
  font-family: inherit;
}
.nav-btn:hover { background: rgba(255,255,255,.1); color: #fff; }
.nav-btn:focus-visible { outline: 2px solid var(--primary-light); outline-offset: 2px; }
.nav-btn.active { background: var(--primary); color: #fff; box-shadow: 0 2px 8px rgba(37,99,235,.3); }

.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid rgba(255,255,255,.08);
  font-size: .8rem;
  color: var(--gray-500);
}

/* MAIN */
.main-content {
  flex: 1;
  margin-left: 240px;
  padding: 32px 40px;
  min-height: 100vh;
}

.view { display: none; }
.view.active { display: block; animation: fadeIn .3s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

.view-header { margin-bottom: 28px; }
.view-header h2 { font-size: 1.8rem; font-weight: 700; color: var(--gray-900); }
.view-header p { color: var(--gray-500); font-size: .9rem; margin-top: 4px; }

/* CARDS */
.card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  transition: var(--transition);
}
.card:hover { box-shadow: var(--shadow-lg); }

/* SKELETON LOADER */
.skeleton {
  background: linear-gradient(90deg, var(--gray-100) 25%, var(--gray-200) 50%, var(--gray-100) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }
.skeleton-card {
  height: 100px;
  border-radius: var(--radius);
  margin-bottom: 16px;
}
.skeleton-bar {
  height: 16px;
  margin: 8px 0;
  border-radius: 4px;
}
.skeleton-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 28px;
}

/* STATS GRID */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 28px;
}
.stat-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  text-align: center;
  border-top: 4px solid var(--primary);
  transition: var(--transition);
}
.stat-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.stat-card .stat-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--gray-900);
  line-height: 1.2;
  font-family: 'Crimson Pro', serif;
}
.stat-card .stat-label {
  font-size: .8rem;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: .04em;
  margin-top: 4px;
}
.stat-card:nth-child(2) { border-top-color: var(--secondary); }
.stat-card:nth-child(3) { border-top-color: var(--success); }
.stat-card:nth-child(4) { border-top-color: var(--accent); }

/* SECTION BREAKDOWN */
.section-breakdown { background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px; }
.section-breakdown h3 { margin-bottom: 16px; font-size: 1.15rem; color: var(--gray-700); }
.section-bar { display: flex; align-items: center; gap: 12px; padding: 6px 0; }
.section-bar .label { width: 140px; font-size: .85rem; color: var(--gray-600); flex-shrink: 0; }
.section-bar .bar-track { flex: 1; height: 8px; background: var(--gray-100); border-radius: 4px; overflow: hidden; }
.section-bar .bar-fill { height: 100%; background: var(--primary-light); border-radius: 4px; transition: width .6s ease; }
.section-bar .count { font-size: .85rem; color: var(--gray-500); width: 50px; text-align: right; }

/* FILTER BAR */
.filter-bar {
  display: flex;
  gap: 16px;
  align-items: end;
  flex-wrap: wrap;
  margin-bottom: 24px;
  background: #fff;
  padding: 20px 24px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.filter-group { display: flex; flex-direction: column; gap: 4px; }
.filter-group label { font-size: .78rem; font-weight: 600; color: var(--gray-600); text-transform: uppercase; letter-spacing: .04em; }

.select-input {
  padding: 10px 14px;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: .9rem;
  background: #fff;
  color: var(--gray-800);
  cursor: pointer;
  font-family: inherit;
  transition: var(--transition);
}
.select-input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,.15); }

/* BUTTONS */
.btn {
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 2px 6px rgba(37,99,235,.25); }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(37,99,235,.35); }
.btn-primary:active { transform: translateY(0); }
.btn-primary:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.btn-secondary { background: var(--gray-100); color: var(--gray-700); }
.btn-secondary:hover { background: var(--gray-200); }
.btn-secondary:focus-visible { outline: 2px solid var(--gray-400); outline-offset: 2px; }
.btn-success { background: var(--success); color: #fff; box-shadow: 0 2px 6px rgba(16,185,129,.25); }
.btn-success:hover { background: #059669; transform: translateY(-1px); }
.btn-lg { padding: 14px 32px; font-size: 1.05rem; border-radius: var(--radius); }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none !important; }

/* QUESTION LIST */
.question-list { display: flex; flex-direction: column; gap: 16px; }
.question-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  transition: var(--transition);
}
.question-card:hover { box-shadow: var(--shadow-lg); }
.question-card .q-header {
  display: flex;
  justify-content: space-between;
  align-items: start;
  margin-bottom: 12px;
}
.question-card .q-number {
  font-weight: 700;
  color: var(--primary);
  font-size: .85rem;
  background: var(--primary-bg);
  padding: 2px 10px;
  border-radius: 20px;
  font-family: 'Atkinson Hyperlegible', sans-serif;
}
.question-card .q-section {
  font-size: .78rem;
  color: var(--gray-500);
  background: var(--gray-100);
  padding: 2px 10px;
  border-radius: 20px;
}
.question-card .q-text {
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 16px;
  color: var(--gray-800);
}
.question-card .q-options { display: flex; flex-direction: column; gap: 8px; margin-bottom: 12px; }
.question-card .q-option {
  padding: 12px 16px;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: .92rem;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
}
.question-card .q-option:hover { border-color: var(--primary-light); background: var(--primary-bg); }
.question-card .q-option .marker {
  width: 26px; height: 26px;
  border-radius: 50%;
  border: 2px solid var(--gray-300);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .75rem;
  font-weight: 700;
  color: var(--gray-500);
  flex-shrink: 0;
}
.question-card .q-option.correct {
  border-color: var(--success);
  background: #ECFDF5;
}
.question-card .q-option.correct .marker {
  border-color: var(--success);
  background: var(--success);
  color: #fff;
}
.question-card .q-option.wrong {
  border-color: var(--danger);
  background: #FEF2F2;
}
.question-card .q-option.wrong .marker {
  border-color: var(--danger);
  background: var(--danger);
  color: #fff;
}
.question-card .q-answer {
  font-size: .85rem;
  color: var(--success);
  font-weight: 600;
  padding-top: 8px;
  border-top: 1px solid var(--gray-100);
  display: none;
}
.question-card.show-answer .q-answer { display: block; }
.question-card .q-toggle {
  margin-top: 8px;
}

/* PAGINATION */
.pagination {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin-top: 28px;
  flex-wrap: wrap;
}
.pagination button {
  width: 38px; height: 38px;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-sm);
  background: #fff;
  font-size: .85rem;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
  font-weight: 600;
}
.pagination button:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-bg); }
.pagination button:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.pagination button.active { background: var(--primary); color: #fff; border-color: var(--primary); box-shadow: 0 2px 6px rgba(37,99,235,.3); }
.pagination button:disabled { opacity: .4; cursor: not-allowed; }

/* QUIZ SETUP */
.quiz-setup { max-width: 480px; margin: 0 auto; }
.setup-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 36px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.setup-card h3 { font-size: 1.3rem; color: var(--gray-800); margin-bottom: 8px; }

/* QUIZ ACTIVE */
.quiz-active { max-width: 800px; margin: 0 auto; }
.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}
.quiz-progress {
  flex: 1;
  height: 8px;
  background: var(--gray-200);
  border-radius: 4px;
  overflow: hidden;
  margin-right: 20px;
}
.quiz-progress .progress-fill {
  height: 100%;
  background: var(--primary-light);
  border-radius: 4px;
  transition: width .3s ease;
}
.quiz-timer {
  font-size: 1.3rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--gray-700);
  min-width: 80px;
  text-align: right;
  font-family: 'Atkinson Hyperlegible', sans-serif;
}
.quiz-timer.warning { color: var(--accent); }
.quiz-timer.danger { color: var(--danger); animation: pulse 1s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .5; } }

.quiz-timer-warning {
  text-align: center;
  padding: 8px 16px;
  background: #FFFBEB;
  border: 2px solid var(--accent);
  border-radius: var(--radius-sm);
  color: #92400E;
  font-weight: 600;
  font-size: .9rem;
  margin-bottom: 16px;
  animation: slideDown .3s ease;
}
@keyframes slideDown { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: translateY(0); } }

.quiz-stats-bar {
  display: flex;
  justify-content: space-between;
  font-size: .9rem;
  color: var(--gray-500);
  margin-bottom: 20px;
}
.quiz-question-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 36px;
  margin-bottom: 20px;
}
.quiz-question-card .q-label {
  font-size: .8rem;
  color: var(--gray-400);
  margin-bottom: 8px;
}
.quiz-question-card .q-text {
  font-size: 1.15rem;
  line-height: 1.7;
  margin-bottom: 24px;
  color: var(--gray-800);
}
.quiz-option {
  display: block;
  padding: 14px 18px;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
  cursor: pointer;
  transition: var(--transition);
  font-size: .95rem;
  font-family: inherit;
  text-align: left;
  width: 100%;
}
.quiz-option:hover { border-color: var(--primary-light); background: var(--primary-bg); }
.quiz-option:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.quiz-option.selected { border-color: var(--primary); background: var(--primary-bg); box-shadow: 0 0 0 3px rgba(37,99,235,.1); }
.quiz-option.correct { border-color: var(--success); background: #ECFDF5; }
.quiz-option.wrong { border-color: var(--danger); background: #FEF2F2; }
.quiz-option .marker {
  display: inline-block;
  width: 24px; height: 24px;
  border-radius: 50%;
  border: 2px solid var(--gray-300);
  text-align: center;
  line-height: 20px;
  font-size: .75rem;
  font-weight: 700;
  margin-right: 10px;
  color: var(--gray-500);
  flex-shrink: 0;
}
.quiz-option.selected .marker { border-color: var(--primary); background: var(--primary); color: #fff; }
.quiz-option.correct .marker { border-color: var(--success); background: var(--success); color: #fff; }
.quiz-option.wrong .marker { border-color: var(--danger); background: var(--danger); color: #fff; }
.quiz-nav {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-top: 12px;
}

/* RESULT */
.quiz-result { max-width: 600px; margin: 0 auto; }
.result-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow-xl);
  padding: 48px 32px;
  text-align: center;
}
.result-card h2 { font-size: 2rem; margin-bottom: 24px; color: var(--gray-800); }
.result-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}
.result-stat .rs-value { font-size: 2rem; font-weight: 800; font-family: 'Crimson Pro', serif; }
.result-stat .rs-label { font-size: .8rem; color: var(--gray-500); text-transform: uppercase; letter-spacing: .04em; }
.result-stat.correct .rs-value { color: var(--success); }
.result-stat.wrong .rs-value { color: var(--danger); }
.result-card .btn { margin: 4px; }

/* HIDDEN */
.hidden { display: none !important; }

/* EMPTY STATE */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--gray-400);
  font-size: 1rem;
}

/* REVIEW */
.review-list { display: flex; flex-direction: column; gap: 16px; }

/* SKELETON LOADING */
.skeleton-loading .skeleton { display: block; }

/* USER INFO IN SIDEBAR */
.user-info {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
  padding: 8px 0;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.user-avatar {
  width: 32px; height: 32px;
  border-radius: 50%;
  flex-shrink: 0;
}
.user-details {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}
.user-name {
  font-size: .82rem;
  color: #fff;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.btn-logout {
  background: none;
  border: none;
  color: var(--gray-400);
  font-size: .72rem;
  cursor: pointer;
  padding: 0;
  text-align: left;
  font-family: inherit;
  transition: var(--transition);
}
.btn-logout:hover { color: var(--danger); }

/* AUTH OVERLAY */
.auth-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gray-50);
}
.auth-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow-xl);
  padding: 40px 36px;
  width: 100%;
  max-width: 420px;
  margin: 20px;
}
.auth-header {
  text-align: center;
  margin-bottom: 24px;
}
.auth-header .logo {
  font-size: 1.8rem;
  margin-bottom: 4px;
}
.auth-header p {
  color: var(--gray-500);
  font-size: .9rem;
}
.auth-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.auth-field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.auth-field label {
  font-size: .78rem;
  font-weight: 600;
  color: var(--gray-600);
  text-transform: uppercase;
  letter-spacing: .04em;
}
.auth-input {
  padding: 12px 14px;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: .95rem;
  font-family: inherit;
  color: var(--gray-800);
  transition: var(--transition);
}
.auth-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,.15);
}
.btn-block { width: 100%; justify-content: center; }
.btn-google {
  width: 100%;
  justify-content: center;
  padding: 12px 18px;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-sm);
  background: #fff;
  color: var(--gray-700);
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-google:hover { border-color: var(--gray-300); background: var(--gray-50); }
.auth-error {
  background: #FEF2F2;
  border: 1px solid var(--danger);
  color: var(--danger);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: .85rem;
  text-align: center;
}
.auth-switch {
  text-align: center;
  font-size: .85rem;
  color: var(--gray-500);
}
.auth-switch a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
}
.auth-switch a:hover { text-decoration: underline; }

/* MOCK TEST CARDS */
.mocktest-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 20px;
}
.mock-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  border-left: 4px solid var(--card-accent, var(--primary));
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.mock-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.mock-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
}
.mock-card-badge {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--card-accent, var(--primary));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: .9rem;
  flex-shrink: 0;
}
.mock-card-header h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--gray-800);
  line-height: 1.3;
}
.mock-card-meta {
  display: flex;
  gap: 16px;
  font-size: .82rem;
  color: var(--gray-500);
}
.mock-card-subjects {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.mock-subject-tag {
  font-size: .72rem;
  padding: 2px 10px;
  border-radius: 20px;
  background: var(--gray-100);
  color: var(--gray-600);
  font-weight: 500;
}
.start-mock-btn { margin-top: auto; justify-content: center; }

.mocktest-back {
  display: flex;
  align-items: center;
  gap: 16px;
}
.mocktest-title-display {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--gray-800);
}

/* FORMULA GUIDE */
#formulasContent { display: flex; flex-direction: column; gap: 18px; }
.fml-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 24px;
  transition: var(--transition);
}
.fml-card:hover { box-shadow: var(--shadow-lg); }
.fml-card-head {
  border-bottom: 2px solid var(--gray-100);
  padding-bottom: 12px;
  margin-bottom: 14px;
}
.fml-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--gray-900);
  font-family: 'Crimson Pro', Georgia, serif;
  margin: 0;
}
.fml-card-sub { color: var(--gray-400); font-size: .8rem; }
.fml-card-body p { margin: 6px 0; color: var(--gray-700); font-size: .92rem; line-height: 1.7; }
.fml-card-body ul { margin: 8px 0; padding-left: 22px; list-style: disc; }
.fml-card-body li { margin: 6px 0; color: var(--gray-700); font-size: .92rem; line-height: 1.7; }
.fml-card-body h4 {
  margin: 14px 0 6px;
  font-size: .95rem;
  font-weight: 700;
  color: var(--primary-dark);
}
.fml-card-body hr { border: none; border-top: 1px dashed var(--gray-200); margin: 14px 0; }
.fml-chip {
  background: var(--primary-bg);
  color: var(--primary-dark);
  font-family: 'Atkinson Hyperlegible', monospace;
  font-size: .88em;
  padding: 1px 6px;
  border-radius: 6px;
  display: inline-block;
}
.fml-table {
  width: 100%;
  border-collapse: collapse;
  margin: 10px 0;
  font-size: .9rem;
}
.fml-table th, .fml-table td {
  border: 1px solid var(--gray-200);
  padding: 7px 12px;
  text-align: left;
  vertical-align: top;
}
.fml-table th {
  background: var(--primary-bg);
  color: var(--primary-dark);
  font-weight: 700;
}

/* RESPONSIVE */
@media (max-width: 768px) {
  .sidebar { width: 60px; }
  .sidebar .logo { font-size: 1rem; }
  .sidebar .subtitle, .sidebar-footer { display: none; }
  .sidebar .nav-btn span:last-child { display: none; }
  .sidebar .nav-btn { justify-content: center; padding: 10px; }
  .main-content { margin-left: 60px; padding: 20px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .filter-bar { flex-direction: column; align-items: stretch; }
  .quiz-header { flex-direction: column; gap: 10px; }
  .quiz-timer { text-align: left; }
  .result-stats { grid-template-columns: repeat(3, 1fr); gap: 8px; }
  .result-stat .rs-value { font-size: 1.5rem; }
}