:root {
  /* Premium Dark Theme Color System */
  --bg-primary: #070913;
  --bg-secondary: #0d111c;
  --bg-glass: rgba(17, 22, 38, 0.65);
  --bg-glass-hover: rgba(25, 32, 56, 0.8);
  --border-glass: rgba(255, 255, 255, 0.065);
  --border-glass-active: rgba(255, 255, 255, 0.15);
  
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  --text-subtle: #475569;
  
  /* Subject Neon Accents */
  --accent-math-start: #6366f1;
  --accent-math-end: #8b5cf6;
  --accent-math-glow: rgba(99, 102, 241, 0.22);
  
  --accent-science-start: #10b981;
  --accent-science-end: #06b6d4;
  --accent-science-glow: rgba(16, 185, 129, 0.22);
  
  --accent-english-start: #f43f5e;
  --accent-english-end: #f59e0b;
  --accent-english-glow: rgba(244, 63, 94, 0.22);

  /* Platform Accent Default */
  --accent-start: #6366f1;
  --accent-end: #a855f7;
  --accent-glow: rgba(124, 58, 237, 0.28);
  --accent-gradient: linear-gradient(135deg, var(--accent-start), var(--accent-end));

  /* Feedback Colors */
  --color-correct: #10b981;
  --color-correct-glow: rgba(16, 185, 129, 0.15);
  --color-incorrect: #f43f5e;
  --color-incorrect-glow: rgba(244, 63, 94, 0.15);
  
  /* Fonts & Radius */
  --font-body: "Plus Jakarta Sans", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", monospace;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;
  
  /* Animation Curves */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 150ms var(--ease-out);
  --transition-normal: 350ms var(--ease-out);
  --transition-slow: 600ms var(--ease-out);
}

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

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  position: relative;
  overflow-x: hidden;
  /* Premium abstract neon radial blobs */
  background-image: 
    radial-gradient(circle 500px at 50% -100px, rgba(99, 102, 241, 0.16), transparent),
    radial-gradient(circle 400px at 90% 80%, rgba(168, 85, 247, 0.08), transparent),
    radial-gradient(circle 350px at -10% 40%, rgba(16, 185, 129, 0.06), transparent);
}

.app {
  max-width: 820px;
  margin: 0 auto;
  padding: 2rem 1.5rem 5rem;
}

.hidden {
  display: none !important;
}

/* 1. Header Navigation */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 3.5rem;
  animation: fadeSlideDown 0.6s var(--ease-out);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-symbol {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: var(--accent-gradient);
  color: #fff;
  font-family: var(--font-body);
  font-size: 1.65rem;
  font-weight: 800;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.logo-text {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  background: linear-gradient(135deg, #fff 40%, var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.settings-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  color: var(--text-secondary);
  font-size: 1.25rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.settings-toggle-btn:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-glass-active);
  color: #fff;
  transform: rotate(30deg);
}

/* 2. Settings Drawer Overlay */
.settings-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  display: flex;
  justify-content: flex-end;
  animation: fadeIn 0.3s var(--ease-out);
}

.settings-drawer {
  width: 380px;
  height: 100%;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border-glass);
  padding: 2.5rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  box-shadow: -10px 0 40px rgba(0, 0, 0, 0.4);
  animation: drawerSlide 0.4s var(--ease-out);
}

.settings-drawer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-glass);
  padding-bottom: 1rem;
}

.settings-drawer-header h3 {
  font-size: 1.35rem;
  font-weight: 700;
}

.close-drawer-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.8rem;
  cursor: pointer;
  line-height: 1;
  transition: color var(--transition-fast);
}

.close-drawer-btn:hover {
  color: #fff;
}

.settings-group {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.settings-label {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.length-options {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.6rem;
}

.length-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1.25rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  text-align: left;
  transition: all var(--transition-fast);
}

.length-btn:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-glass-active);
  color: #fff;
}

.length-btn.active {
  background: rgba(99, 102, 241, 0.1);
  border-color: var(--accent-start);
  color: #fff;
  box-shadow: 0 0 15px var(--accent-glow);
}

.len-val {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.1rem;
}

.len-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.reset-buttons {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.reset-btn {
  padding: 0.75rem;
  background: rgba(244, 63, 94, 0.04);
  border: 1px solid rgba(244, 63, 94, 0.2);
  color: var(--color-incorrect);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.reset-btn:hover {
  background: rgba(244, 63, 94, 0.1);
  border-color: var(--color-incorrect);
}

.reset-all-btn {
  padding: 0.85rem;
  background: var(--color-incorrect);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 15px var(--color-incorrect-glow);
}

.reset-all-btn:hover {
  background: #e11d48;
  box-shadow: 0 6px 20px var(--color-incorrect-glow);
  transform: translateY(-1px);
}

/* 3. Setup Panel Dashboard */
.setup-panel, .question-card, .results-panel, .diagnostic-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(28px);
  -webkit-backdrop-filter: blur(28px);
  padding: 2.75rem 2.5rem;
  box-shadow: 0 20px 50px rgba(0,0,0,0.3);
}

.setup-panel {
  display: flex;
  flex-direction: column;
  gap: 2.25rem;
  animation: fadeSlideUp 0.6s var(--ease-out);
}

.hero-section {
  text-align: center;
}

.hero-title {
  font-size: 1.85rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.75rem;
  background: linear-gradient(135deg, #fff, var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 0.95rem;
  color: var(--text-secondary);
  max-width: 580px;
  margin: 0 auto;
  line-height: 1.7;
}

.section-divider {
  display: flex;
  align-items: center;
  text-align: center;
  color: var(--text-subtle);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.15em;
}

.section-divider::before, .section-divider::after {
  content: '';
  flex: 1;
  border-bottom: 1.5px solid rgba(255, 255, 255, 0.04);
}

.section-divider::before { margin-right: 1.25rem; }
.section-divider::after { margin-left: 1.25rem; }

/* Subject Dashboard Grid */
.subject-dashboard {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.15rem;
}

.subject-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 1.5rem;
  background: rgba(255, 255, 255, 0.015);
  border: 1.5px solid var(--border-glass);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.subject-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle 100px at 50% 120%, var(--accent-glow), transparent);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.subject-card:hover {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--border-glass-active);
  transform: translateY(-4px);
}

.subject-card:hover::after {
  opacity: 0.6;
}

.subject-card-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.subject-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  font-size: 1.2rem;
  font-weight: bold;
  background: rgba(255, 255, 255, 0.04);
  transition: all var(--transition-normal);
}

/* Specific glows */
.subject-card[data-subject="math"] .subject-icon { color: var(--accent-math-start); background: rgba(99, 102, 241, 0.08); }
.subject-card[data-subject="science"] .subject-icon { color: var(--accent-science-start); background: rgba(16, 185, 129, 0.08); }
.subject-card[data-subject="english"] .subject-icon { color: var(--accent-english-start); background: rgba(244, 63, 94, 0.08); }

.subject-card.active[data-subject="math"] {
  border-color: var(--accent-math-start);
  background: rgba(99, 102, 241, 0.03);
  box-shadow: 0 10px 30px var(--accent-math-glow);
}
.subject-card.active[data-subject="science"] {
  border-color: var(--accent-science-start);
  background: rgba(16, 185, 129, 0.03);
  box-shadow: 0 10px 30px var(--accent-science-glow);
}
.subject-card.active[data-subject="english"] {
  border-color: var(--accent-english-start);
  background: rgba(244, 63, 94, 0.03);
  box-shadow: 0 10px 30px var(--accent-english-glow);
}

.subject-card.active .subject-icon {
  transform: scale(1.1);
  color: #fff !important;
}
.subject-card.active[data-subject="math"] .subject-icon { background: var(--accent-math-start); }
.subject-card.active[data-subject="science"] .subject-icon { background: var(--accent-science-start); }
.subject-card.active[data-subject="english"] .subject-icon { background: var(--accent-english-start); }

.subject-card-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

.subject-card-body {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-bottom: 1.25rem;
  z-index: 1;
}

.subject-stat-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.stat-lbl {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
}

.stat-val {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-secondary);
}

.subject-card.active .stat-val {
  color: #fff;
}

.subject-card-footer {
  font-size: 0.68rem;
  color: var(--text-subtle);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-top: 1px solid rgba(255, 255, 255, 0.03);
  padding-top: 0.75rem;
  z-index: 1;
}

/* Call to Action Button */
.start-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 1.05rem 2.5rem;
  background: var(--accent-gradient);
  color: #fff;
  border: none;
  border-radius: var(--radius-xl);
  font-family: var(--font-body);
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: 0 6px 30px var(--accent-glow);
  align-self: center;
  min-width: 280px;
}

.start-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 40px var(--accent-glow);
}

.start-btn:active {
  transform: translateY(0);
}

.start-arrow {
  transition: transform var(--transition-fast);
}

.start-btn:hover .start-arrow {
  transform: translateX(4px);
}

/* Dynamic IRT Illustration Panel */
.irt-explanation-panel {
  border-top: 1px solid rgba(255,255,255,0.04);
  padding-top: 1.5rem;
}

.irt-explanation-panel h4 {
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.85rem;
}

.irt-flex {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.irt-svg-container {
  flex: 0 0 140px;
  background: rgba(0, 0, 0, 0.15);
  border-radius: var(--radius-md);
  padding: 0.5rem;
  border: 1px solid var(--border-glass);
}

.irt-curve-svg {
  width: 100%;
  height: auto;
  display: block;
}

.irt-text-container p {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 4. Active Testing Interface */
.test-interface {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  animation: fadeSlideUp 0.4s var(--ease-out);
}

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

.stat-pill {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0.9rem 1rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
}

.stat-label {
  font-size: 0.7rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 800;
}

.stat-accuracy .stat-value { color: var(--color-correct); }
.stat-grade .stat-value { color: #3b82f6; }
.stat-elo .stat-value { color: #a855f7; }

/* Progress Section & Speed Ring */
.progress-section {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.25rem;
}

.progress-track-wrapper {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.progress-track {
  flex: 1;
  height: 6px;
  background: rgba(255, 255, 255, 0.04);
  border-radius: 99px;
  overflow: hidden;
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.02);
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: var(--accent-gradient);
  border-radius: 99px;
  transition: width var(--transition-normal);
  box-shadow: 0 0 10px var(--accent-glow);
}

.progress-counter-text {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-secondary);
}

.speed-bar-container {
  display: none !important;
}

.speed-bar-fill {
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--color-correct), #10b981);
  border-radius: 99px;
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.5);
}

.speed-bar-label {
  display: none !important;
}

/* Question Card */
.question-card {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  padding: 2.75rem 2.5rem 2.25rem;
}

.question-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.question-number {
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.question-feedback-badge {
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.35rem 0.95rem;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  animation: scalePop 0.3s var(--ease-out);
}

.question-feedback-badge.correct {
  color: var(--color-correct);
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.25);
  box-shadow: 0 0 15px var(--color-correct-glow);
}

.question-feedback-badge.incorrect {
  color: var(--color-incorrect);
  background: rgba(244, 63, 94, 0.08);
  border: 1px solid rgba(244, 63, 94, 0.25);
  box-shadow: 0 0 15px var(--color-incorrect-glow);
}

.question-stem {
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.7;
  color: var(--text-primary);
}

.choices-container {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.choice-btn {
  display: flex;
  align-items: center;
  gap: 1rem;
  width: 100%;
  padding: 1.05rem 1.25rem;
  background: rgba(255, 255, 255, 0.015);
  border: 1px dashed var(--border-glass);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  text-align: left;
  transition: all var(--transition-fast);
}

.choice-btn:hover {
  background: var(--bg-glass-hover);
  border-style: solid;
  border-color: var(--border-glass-active);
  color: #fff;
}

.choice-btn.selected {
  background: rgba(99, 102, 241, 0.08);
  border-style: solid;
  border-color: var(--accent-start);
  color: #fff;
  box-shadow: 0 0 15px var(--accent-glow);
}

.choice-letter {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.choice-btn:hover .choice-letter {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-secondary);
}

.choice-btn.selected .choice-letter {
  background: var(--accent-start);
  color: #fff;
}

.typed-answer-container {
  width: 100%;
}

.typed-answer-input {
  width: 100%;
  padding: 1.05rem 1.25rem;
  background: rgba(255,255,255,0.015);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 1rem;
  outline: none;
  transition: all var(--transition-fast);
}

.typed-answer-input::placeholder {
  color: var(--text-muted);
}

.typed-answer-input:focus {
  border-color: var(--accent-start);
  background: rgba(255,255,255,0.03);
  box-shadow: 0 0 15px var(--accent-glow);
}

.question-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid rgba(255, 255, 255, 0.03);
  padding-top: 1.5rem;
  margin-top: 0.5rem;
}

.keyboard-hints {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 600;
}

.shortcut-key {
  display: inline-block;
  padding: 0.15rem 0.4rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-glass);
  border-radius: 4px;
  font-family: var(--font-mono);
  margin-right: 0.2rem;
  color: var(--text-secondary);
}

.submit-btn {
  padding: 0.85rem 1.75rem;
  background: var(--accent-gradient);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 15px var(--accent-glow);
}

.submit-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--accent-glow);
}

.submit-btn:active {
  transform: translateY(0);
}

/* 5. Diagnostic Results Dashboard */
.results-panel {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  animation: fadeSlideUp 0.6s var(--ease-out);
}

.results-header {
  text-align: center;
}

.completed-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-start);
  background: rgba(99, 102, 241, 0.08);
  border: 1.5px solid rgba(99, 102, 241, 0.2);
  padding: 0.35rem 1rem;
  border-radius: 99px;
  margin-bottom: 0.75rem;
}

.results-title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  background: linear-gradient(135deg, #fff, var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.result-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  padding: 1.75rem 1rem;
  background: rgba(255, 255, 255, 0.015);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  animation: cardScaleIn 0.6s var(--ease-out) both;
}

.result-card:nth-child(1) { animation-delay: 0.1s; }
.result-card:nth-child(2) { animation-delay: 0.2s; }
.result-card:nth-child(3) { animation-delay: 0.3s; }

.result-icon {
  font-size: 1.75rem;
  margin-bottom: 0.25rem;
}

.result-stat {
  font-family: var(--font-mono);
  font-size: 1.85rem;
  font-weight: 800;
}

.result-label {
  font-size: 0.7rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.result-detail {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}

.result-accuracy .result-stat { color: var(--color-correct); }
.result-grade .result-stat { color: #3b82f6; }
.result-elo .result-stat { color: #a855f7; }

/* Custom result cards gradient glows */
.result-accuracy { box-shadow: inset 0 0 25px rgba(16, 185, 129, 0.04); }
.result-grade { box-shadow: inset 0 0 25px rgba(59, 130, 246, 0.04); }
.result-elo { box-shadow: inset 0 0 25px rgba(168, 85, 247, 0.04); }

.diagnostic-card {
  padding: 2rem;
}

.diagnostic-card-title {
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
  border-bottom: 1.5px solid rgba(255, 255, 255, 0.03);
  padding-bottom: 0.75rem;
}

/* Mastery Topics List */
.mastery-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.mastery-row {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.mastery-topic-name {
  flex: 0 0 220px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.mastery-track {
  flex: 1;
  height: 8px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 99px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.01);
}

.mastery-fill {
  height: 100%;
  border-radius: 99px;
  background: var(--color-correct);
  width: 0%;
  transition: width 1s var(--ease-out);
}

.mastery-percent {
  flex: 0 0 45px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  text-align: right;
}

.mastery-percent.high { color: var(--color-correct); }
.mastery-percent.med { color: #eab308; }
.mastery-percent.low { color: var(--color-incorrect); }

/* Detailed Diagnostics Table Accordion */
.detail-card {
  padding: 0;
  overflow: hidden;
}

.accordion-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding: 1.5rem 2rem;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.accordion-header:hover {
  background: rgba(255, 255, 255, 0.015);
}

.accordion-arrow {
  font-size: 0.75rem;
  transition: transform var(--transition-fast);
  color: var(--text-muted);
}

.accordion-header.active .accordion-arrow {
  transform: rotate(180deg);
}

.accordion-content {
  border-top: 1px solid rgba(255, 255, 255, 0.04);
}

.table-scroll {
  overflow-x: auto;
}

.diagnostic-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.diagnostic-table th, .diagnostic-table td {
  padding: 1rem 1.5rem;
  font-size: 0.85rem;
}

.diagnostic-table th {
  background: rgba(0, 0, 0, 0.15);
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.72rem;
}

.diagnostic-table tbody tr {
  border-bottom: 1.5px solid rgba(255, 255, 255, 0.02);
}

.diagnostic-table tbody tr:last-child {
  border: none;
}

.diagnostic-table tbody tr:hover {
  background: rgba(255, 255, 255, 0.005);
}

.log-num {
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.log-topic {
  font-weight: 600;
  color: var(--text-secondary);
}

.log-diff {
  font-family: var(--font-mono);
  color: var(--text-secondary);
}

.log-speed {
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.log-res {
  font-weight: 700;
}

.log-res.correct { color: var(--color-correct); }
.log-res.incorrect { color: var(--color-incorrect); }

.log-elo {
  font-family: var(--font-mono);
  font-weight: 700;
}

.log-elo.plus { color: var(--color-correct); }
.log-elo.minus { color: var(--color-incorrect); }

/* Share Card */
.share-card {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.share-description {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.scorecard-copy-wrapper {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.scorecard-text {
  width: 100%;
  height: 120px;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 1rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.5;
  resize: none;
  outline: none;
}

.copy-scorecard-btn {
  padding: 0.8rem;
  background: var(--bg-glass);
  border: 1.5px solid var(--border-glass);
  color: var(--text-primary);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.copy-scorecard-btn:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-glass-active);
}

.copy-scorecard-btn:active {
  transform: translateY(1px);
}

.restart-btn {
  margin-top: 1rem;
}

/* Dynamic counter transition bumps */
@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.08); }
  100% { transform: scale(1); }
}

.stat-bump {
  animation: pulse 0.3s var(--ease-out);
}

/* Animations */
@keyframes fadeSlideDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeSlideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes drawerSlide {
  from { transform: translateX(100%); }
  to { transform: translateX(0); }
}

@keyframes scalePop {
  0% { opacity: 0; transform: scale(0.85); }
  100% { opacity: 1; transform: scale(1); }
}

@keyframes cardScaleIn {
  from { opacity: 0; transform: translateY(15px) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

/* SVG Line Draw Effect */
.curve-path {
  stroke-dasharray: 200;
  stroke-dashoffset: 200;
  animation: drawLine 2s forwards var(--ease-out) 0.5s;
}

@keyframes drawLine {
  to { stroke-dashoffset: 0; }
}

/* Responsive Scaling details */
@media (max-width: 768px) {
  .app {
    padding: 1.5rem 1rem 4rem;
  }
  .app-header {
    margin-bottom: 2.25rem;
  }
  .setup-panel, .question-card, .results-panel {
    padding: 2rem 1.5rem;
  }
  .subject-dashboard {
    grid-template-columns: 1fr;
    gap: 0.85rem;
  }
  .subject-card {
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: 1.5rem;
    padding: 1.25rem 1.5rem;
  }
  .subject-card-header {
    margin-bottom: 0;
    flex: 0 0 150px;
  }
  .subject-card-body {
    margin-bottom: 0;
    flex: 1;
  }
  .subject-card-footer {
    display: none;
  }
  .irt-flex {
    flex-direction: column;
    align-items: stretch;
    gap: 1rem;
  }
  .irt-svg-container {
    align-self: center;
    flex: 0 0 auto;
    width: 160px;
  }
  .stats-bar {
    gap: 0.6rem;
  }
  .stat-pill {
    padding: 0.75rem 0.5rem;
  }
  .stat-value {
    font-size: 1.25rem;
  }
  .results-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }
  .result-card {
    flex-direction: row;
    justify-content: flex-start;
    gap: 1.25rem;
    padding: 1.15rem 1.5rem;
  }
  .result-icon {
    margin-bottom: 0;
  }
  .result-stat {
    font-size: 1.5rem;
  }
  .mastery-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
  }
  .mastery-topic-name {
    flex: none;
    width: 100%;
  }
  .mastery-track {
    width: 100%;
  }
  .mastery-percent {
    align-self: flex-end;
  }
  .settings-drawer {
    width: 100%;
  }
}