:root {
  --font-display: 'Syne', sans-serif;
  --font-body: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;

  
  --accent: #7f1d1d;
  --accent-light: #991b1b;
  --accent-dark: #601213;

  
  --bg-body: #f6f5f2;
  --bg-card: #ffffff;
  --bg-ghost: #f0eeea;
  --bg-hover: #e8e5e0;
  --border-subtle: rgba(28, 25, 23, 0.06);

  
  --text-primary: #1c1917;
  --text-secondary: #78716c;
  --text-tertiary: #a8a29e;
  --text-on-accent: #f6f5f2;

  
  --success: #15803d;
  --error: #b91c1c;
  --warning: #b45309;

  
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 32px;
  --radius-xl: 40px;

  
  --shadow-sm: 0 1px 2px rgba(28, 25, 23, 0.04), 0 1px 3px rgba(28, 25, 23, 0.02);
  --shadow-md: 0 4px 24px rgba(28, 25, 23, 0.05), 0 2px 8px rgba(28, 25, 23, 0.03);
  --shadow-lg: 0 16px 48px rgba(28, 25, 23, 0.07), 0 4px 16px rgba(28, 25, 23, 0.04);

  
  --ease-spring: cubic-bezier(0.32, 0.72, 0, 1);
  --transition-fast: 200ms var(--ease-spring);
  --transition-base: 400ms var(--ease-spring);
  --transition-slow: 600ms var(--ease-spring);

  
  --layout-content-max: 880px;
  --layout-form-max: 680px;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-body);
  background-image: radial-gradient(var(--border-subtle) 1px, transparent 1px);
  background-size: 20px 20px;
  background-position: -10px -10px;
  color: var(--text-primary);
  line-height: 1.55;
  min-height: 100dvh;
}

.noise-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 200px 200px;
}

.view {
  display: none;
  min-height: 100dvh;
  animation: viewEnter 450ms var(--ease-spring) forwards;
}

.view--active {
  display: flex;
  flex-direction: column;
}

@keyframes viewEnter {
  0% {
    opacity: 0;
    transform: translateY(12px) scale(0.99);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

#view-landing.view--active {
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* Landing Layout */
.landing-content {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 24px 60px;
}

.landing-bento {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 24px;
  max-width: 1100px;
  width: 100%;
}

@media (max-width: 900px) {
  .landing-bento {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .bento-hero, .bento-roles {
    grid-column: span 2 !important;
  }
}

@media (max-width: 600px) {
  .landing-bento {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  
  .bento-hero, .bento-roles {
    grid-column: span 1 !important;
  }
}

.bento-hero {
  grid-column: span 4;
  grid-row: span 2;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 48px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  box-shadow: 
    var(--shadow-lg),
    inset 0 1px 1px rgba(255, 255, 255, 1);
}

.brand-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  background: var(--accent);
  color: var(--text-on-accent);
  font-size: 32px;
  border-radius: 20px;
  margin-bottom: 24px;
  box-shadow: 0 12px 24px -8px rgba(136, 0, 0, 0.4), inset 0 2px 4px rgba(255, 255, 255, 0.2);
}

.brand-title {
  font-size: 48px;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.1;
}

.brand-subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 100%;
}

.bento-roles {
  grid-column: span 2;
  grid-row: span 2;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.role-card {
  width: 100%;
  flex: 1;
  background: transparent;
  border: none;
  padding: 0;
  cursor: pointer;
  text-align: left;
  outline: none;
  display: block;
}

.role-card-shell {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 8px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-subtle);
  box-shadow: 
    var(--shadow-sm),
    inset 0 1px 1px rgba(255, 255, 255, 1);
  transition: all var(--transition-base);
  height: 100%;
}

.role-card-core {
  background: var(--bg-card);
  border-radius: calc(var(--radius-xl) - 6px);
  padding: 32px;
  border: 1px solid var(--border-subtle);
  box-shadow: 
    inset 0 1px 1px rgba(255, 255, 255, 1),
    0 2px 8px rgba(0, 0, 0, 0.02);
  transition: all var(--transition-base);
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.role-card:hover .role-card-shell {
  background: rgba(255, 255, 255, 0.9);
  border-color: rgba(136, 0, 0, 0.15);
  box-shadow: var(--shadow-md), 0 0 0 4px rgba(136, 0, 0, 0.05);
  transform: translateY(-4px);
}

.role-card:hover .role-card-core {
  border-color: rgba(136, 0, 0, 0.1);
  background: #ffffff;
}

.role-card:active .role-card-shell {
  transform: scale(0.98);
}

.role-icon {
  font-size: 28px;
  color: var(--accent);
  line-height: 1;
  background: rgba(136, 0, 0, 0.05);
  padding: 12px;
  border-radius: var(--radius-md);
  margin-bottom: 16px;
}

.role-label {
  display: block;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}

.role-hint {
  display: block;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.auth-wrap {
  max-width: 440px;
  width: 100%;
  margin: auto;
  padding: 40px 32px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-subtle);
  box-shadow: 
    var(--shadow-lg),
    inset 0 1px 1px rgba(255, 255, 255, 1),
    inset 0 0 0 1px rgba(255, 255, 255, 0.5);
}

.btn-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  padding: 8px 0;
  margin-bottom: 24px;
  transition: all var(--transition-fast);
}

.btn-back:hover {
  color: var(--text-primary);
  transform: translateX(-4px);
}

.auth-title {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 8px;
  letter-spacing: -0.03em;
}

.auth-hint {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Student info fields */
.student-fields {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-top: 8px;
}

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* Builder: attempts + deadline share one row on wide screens */
.builder-settings-row {
  margin-bottom: 8px;
}

.field-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.field-label .optional {
  color: var(--text-tertiary);
  font-weight: 500;
}

.field-input {
  font-family: inherit;
  font-size: 15px;
  padding: 14px 16px;
  background: var(--bg-ghost);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  outline: none;
  transition: all var(--transition-fast);
  width: 100%;
}

.field-input::placeholder {
  color: var(--text-tertiary);
}

.field-input:hover {
  background: var(--bg-hover);
}

.field-input:focus {
  background: var(--bg-card);
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(136, 0, 0, 0.1);
}

.field-input--area {
  resize: vertical;
  min-height: 96px;
}

.field-error {
  font-size: 13px;
  font-weight: 500;
  color: var(--error);
  min-height: 20px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  padding: 14px 24px;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn--primary {
  background: var(--accent);
  color: var(--text-on-accent);
  box-shadow: 0 8px 16px -4px rgba(136, 0, 0, 0.25);
}

.btn--primary:hover {
  background: var(--accent-light);
  transform: translateY(-2px);
  box-shadow: 0 12px 20px -4px rgba(136, 0, 0, 0.3);
}

.btn--primary:active {
  background: var(--accent-dark);
  transform: scale(0.97);
}

.btn--secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-sm);
}

.btn--secondary:hover {
  background: var(--bg-ghost);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn--ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn--ghost:hover {
  background: var(--bg-ghost);
  color: var(--text-primary);
}

.btn--sm {
  padding: 8px 16px;
  font-size: 13px;
  border-radius: 10px;
}

.btn--full {
  width: 100%;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: 24px;
  position: sticky;
  top: 16px;
  margin: 16px auto 32px;
  max-width: var(--layout-content-max);
  width: 100%;
  z-index: 100;
  box-shadow: 0 8px 32px -8px rgba(0, 0, 0, 0.08);
}

/* Form-heavy views use a narrower main column; match the header to that width. */
#view-quiz-builder .app-header,
#view-quiz-taker .app-header,
#view-results .app-header {
  max-width: var(--layout-form-max);
}

#view-quiz-taker .app-header {
  position: relative;
  top: auto;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--accent);
  color: var(--text-on-accent);
  font-size: 18px;
  font-weight: 700;
  border-radius: 10px;
  box-shadow: 0 4px 8px rgba(136, 0, 0, 0.2);
}

.header-title {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 20px;
}

.header-role {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--bg-ghost);
  padding: 6px 12px;
  border-radius: 20px;
}

.app-main {
  flex: 1;
  max-width: var(--layout-content-max);
  width: 100%;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

.app-main--form {
  max-width: var(--layout-form-max);
}

.user-welcome {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.user-welcome strong {
  color: var(--text-primary);
  font-weight: 700;
}

.dashboard-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
}

.dashboard-title {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.section-divider {
  height: 1px;
  background: var(--border-subtle);
  margin: 48px 0;
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  margin-bottom: 40px;
}

.stat-card {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  box-shadow: 
    var(--shadow-sm),
    inset 0 1px 1px rgba(255, 255, 255, 1),
    inset 0 0 0 1px rgba(255, 255, 255, 0.5);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.stat-value {
  font-size: 36px;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  letter-spacing: -0.04em;
}

.stat-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.list-container {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.list-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 24px 28px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  box-shadow: 
    var(--shadow-sm),
    inset 0 1px 1px rgba(255, 255, 255, 1),
    inset 0 0 0 1px rgba(255, 255, 255, 0.5);
  transition: all var(--transition-fast);
}

.list-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: rgba(136, 0, 0, 0.1);
}

.list-item-badge {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 8px 12px;
  background: var(--bg-ghost);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

.list-item-info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.list-item-title {
  font-size: 18px;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text-primary);
}

.list-item-meta {
  font-size: 14px;
  color: var(--text-secondary);
  font-weight: 500;
}

.list-item-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.empty-state {
  text-align: center;
  padding: 64px 24px;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px dashed var(--border-subtle);
}

.empty-state p:first-child {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.empty-hint {
  font-size: 14px;
  color: var(--text-secondary);
}

.builder-card {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 40px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-subtle);
  box-shadow: 
    var(--shadow-md),
    inset 0 1px 1px rgba(255, 255, 255, 1),
    inset 0 0 0 1px rgba(255, 255, 255, 0.5);
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.builder-title {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
}

.questions-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
  margin-top: 8px;
}

.questions-heading {
  font-size: 20px;
  font-weight: 700;
}

.questions-count {
  font-size: 14px;
  color: var(--text-secondary);
  font-weight: 600;
  background: var(--bg-ghost);
  padding: 4px 12px;
  border-radius: 20px;
}

.questions-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Collapsible question card */
.question-card {
  background: var(--bg-ghost);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-fast);
}

.question-card:hover {
  border-color: rgba(136, 0, 0, 0.2);
}

.question-card.is-open {
  background: var(--bg-card);
  box-shadow: var(--shadow-sm);
  border-color: rgba(136, 0, 0, 0.1);
}

.question-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  cursor: pointer;
  user-select: none;
  background: none;
  border: none;
  width: 100%;
  font-family: inherit;
  text-align: left;
}

.question-header-left {
  display: flex;
  align-items: center;
  gap: 16px;
  min-width: 0;
}

.question-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--accent);
  color: var(--text-on-accent);
  font-size: 14px;
  font-weight: 800;
  border-radius: 10px;
  flex-shrink: 0;
  box-shadow: 0 4px 8px rgba(136, 0, 0, 0.2);
}

.question-preview {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.question-toggle {
  font-size: 14px;
  color: var(--text-tertiary);
  transition: transform var(--transition-base);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: var(--bg-card);
  border-radius: 50%;
  box-shadow: var(--shadow-sm);
}

.question-card.is-open .question-toggle {
  transform: rotate(180deg);
}

.question-body {
  display: none;
  padding: 0 24px 24px;
  flex-direction: column;
  gap: 20px;
  animation: slideDown 300ms cubic-bezier(0.32, 0.72, 0, 1) forwards;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.question-card.is-open .question-body {
  display: flex;
}

.question-actions-row {
  display: flex;
  justify-content: flex-end;
  padding-top: 8px;
  border-top: 1px solid var(--border-subtle);
}

.btn-remove {
  font-size: 13px;
  font-weight: 600;
  color: var(--error);
  background: rgba(239, 68, 68, 0.1);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  padding: 8px 16px;
  font-family: inherit;
  transition: all var(--transition-fast);
}

.btn-remove:hover {
  background: rgba(239, 68, 68, 0.2);
}

/* Options for multiple choice */
.options-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.option-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.option-radio {
  width: 20px;
  height: 20px;
  accent-color: var(--accent);
  flex-shrink: 0;
  cursor: pointer;
}

.option-input {
  flex: 1;
}

.btn-add-option {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px 0;
  font-family: inherit;
  align-self: flex-start;
  transition: opacity var(--transition-fast);
}

.btn-add-option:hover {
  opacity: 0.8;
}

/* Yes/No and True/False grids */
.choice-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.choice-label {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  background: var(--bg-ghost);
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.choice-label:hover {
  background: var(--bg-hover);
}

.choice-label input[type="radio"] {
  accent-color: var(--accent);
  width: 18px;
  height: 18px;
}

.choice-label.is-selected {
  border-color: var(--accent);
  background: rgba(136, 0, 0, 0.05);
}

/* Toggle switch for case sensitivity */
.toggle-row {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.toggle-switch {
  position: relative;
  width: 44px;
  height: 24px;
  appearance: none;
  background: var(--bg-hover);
  border-radius: 12px;
  outline: none;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.toggle-switch::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 20px;
  height: 20px;
  background: var(--bg-card);
  border-radius: 50%;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast);
}

.toggle-switch:checked {
  background: var(--accent);
}

.toggle-switch:checked::after {
  transform: translateX(20px);
}

.builder-actions {
  padding-top: 16px;
}

.taker-card {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 40px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-subtle);
  box-shadow: 
    var(--shadow-md),
    inset 0 1px 1px rgba(255, 255, 255, 1),
    inset 0 0 0 1px rgba(255, 255, 255, 0.5);
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.taker-meta {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.taker-title {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.taker-desc {
  font-size: 16px;
  color: var(--text-secondary);
}

.taker-progress {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 8px;
}

.progress-track {
  flex: 1;
  height: 8px;
  background: var(--bg-ghost);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 4px;
  transition: width var(--transition-base);
}

.progress-text {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-secondary);
  min-width: 54px;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.quiz-form {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.taker-question {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border-subtle);
}

.taker-question:last-of-type {
  border-bottom: none;
  padding-bottom: 0;
}

.tq-label {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--text-primary);
}

.tq-required {
  color: var(--error);
}

.tq-choices {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.tq-choice {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  background: var(--bg-ghost);
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 16px;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.tq-choice:hover {
  background: var(--bg-hover);
  transform: translateX(4px);
}

.tq-choice.is-selected {
  border-color: var(--accent);
  background: rgba(136, 0, 0, 0.04);
}

.tq-choice input {
  accent-color: var(--accent);
  width: 18px;
  height: 18px;
}

.tq-input {
  font-family: inherit;
  font-size: 16px;
  padding: 16px;
  background: var(--bg-ghost);
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  outline: none;
  transition: all var(--transition-fast);
  width: 100%;
}

.tq-input:focus {
  background: var(--bg-card);
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(136, 0, 0, 0.1);
}

.taker-actions {
  padding-top: 16px;
}

.results-card {
  background: var(--bg-card);
  padding: 48px 40px;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 32px;
  max-width: 640px;
  margin: 0 auto;
  width: 100%;
}

.results-title {
  font-size: 32px;
  font-weight: 800;
  text-align: center;
  letter-spacing: -0.03em;
}

.score-ring {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  border: 8px solid var(--accent);
  margin: 0 auto;
  position: relative;
  box-shadow: 0 16px 32px -8px rgba(136, 0, 0, 0.2);
}

.score-value {
  font-size: 56px;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  letter-spacing: -0.04em;
}

.score-label {
  font-size: 15px;
  color: var(--text-secondary);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 4px;
}

.result-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  text-align: center;
}

.result-stat {
  background: var(--bg-ghost);
  padding: 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.result-stat-value {
  font-size: 28px;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: 6px;
}

.result-stat-label {
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.breakdown-header {
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
}

.breakdown-title {
  font-size: 20px;
  font-weight: 700;
}

.breakdown-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.breakdown-item {
  --item-accent: var(--text-tertiary);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 24px;
  padding: 6px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  opacity: 0;
  transform: translateY(24px) scale(0.98);
  animation: cardReveal 600ms cubic-bezier(0.32, 0.72, 0, 1) forwards;
  transition: all var(--transition-base);
}

.breakdown-item:nth-child(1) { animation-delay: 0ms; }
.breakdown-item:nth-child(2) { animation-delay: 100ms; }
.breakdown-item:nth-child(3) { animation-delay: 200ms; }
.breakdown-item:nth-child(4) { animation-delay: 300ms; }
.breakdown-item:nth-child(5) { animation-delay: 400ms; }
.breakdown-item:nth-child(6) { animation-delay: 500ms; }
.breakdown-item:nth-child(7) { animation-delay: 600ms; }
.breakdown-item:nth-child(8) { animation-delay: 700ms; }
.breakdown-item:nth-child(9) { animation-delay: 800ms; }
.breakdown-item:nth-child(10) { animation-delay: 900ms; }

@keyframes cardReveal {
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.breakdown-item:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: var(--shadow-md);
}

.breakdown-item.is-correct {
  --item-accent: var(--success);
  border-color: rgba(16, 185, 129, 0.3);
  background: rgba(16, 185, 129, 0.02);
}

.breakdown-item.is-wrong {
  --item-accent: var(--error);
  border-color: rgba(239, 68, 68, 0.3);
  background: rgba(239, 68, 68, 0.02);
}

.bi-core {
  background: var(--bg-card);
  border-radius: 18px;
  box-shadow: inset 0 2px 4px rgba(255, 255, 255, 0.5);
  overflow: hidden;
}

.bi-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 24px;
  cursor: pointer;
  background: none;
  border: none;
  width: 100%;
  font-family: inherit;
  text-align: left;
  transition: background var(--transition-fast);
}

.bi-header:hover {
  background: var(--bg-ghost);
}

.bi-header-left {
  display: flex;
  align-items: center;
  gap: 16px;
  min-width: 0;
  flex: 1;
}

.bi-number {
  font-size: 14px;
  font-weight: 800;
  color: var(--text-primary);
  background: var(--bg-ghost);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  flex-shrink: 0;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.bi-question {
  font-weight: 700;
  font-size: 16px;
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  letter-spacing: -0.01em;
}

.bi-status {
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 6px 14px;
  border-radius: 20px;
  flex-shrink: 0;
}

.bi-status.correct {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
}

.bi-status.wrong {
  background: rgba(239, 68, 68, 0.1);
  color: var(--error);
}

.bi-toggle {
  font-size: 14px;
  color: var(--text-tertiary);
  transition: transform var(--transition-base);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  flex-shrink: 0;
  background: var(--bg-card);
  box-shadow: var(--shadow-sm);
}

.bi-header:hover .bi-toggle {
  background: var(--bg-ghost);
}

.breakdown-item.is-open .bi-toggle {
  transform: rotate(180deg);
}

.bi-body {
  display: none;
  padding: 0 24px 24px;
  flex-direction: column;
  gap: 16px;
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.6;
  animation: slideDown 300ms cubic-bezier(0.32, 0.72, 0, 1) forwards;
}

.breakdown-item.is-open .bi-body {
  display: flex;
}

.bi-divider {
  height: 1px;
  background: var(--border-subtle);
  margin: 8px 0;
}

.bi-line {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.bi-line strong {
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-tertiary);
}

.bi-line .bi-value {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 15px;
  padding: 12px 16px;
  background: var(--bg-ghost);
  border-radius: 12px;
  border: 1px solid var(--border-subtle);
}

.bi-line.wrong-answer .bi-value {
  background: rgba(239, 68, 68, 0.05);
  border-color: rgba(239, 68, 68, 0.2);
  color: var(--error);
}

.bi-line.correct-answer .bi-value {
  background: rgba(16, 185, 129, 0.05);
  border-color: rgba(16, 185, 129, 0.2);
  color: var(--success);
}

.bi-line.explanation .bi-value {
  background: rgba(136, 0, 0, 0.03);
  border-color: rgba(136, 0, 0, 0.1);
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 500;
}

.stats-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}

.table-wrap {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}

.data-table thead {
  background: var(--bg-ghost);
}

.data-table th,
.data-table td {
  padding: 16px 24px;
  text-align: left;
  white-space: nowrap;
}

.data-table th {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 2px solid var(--border-subtle);
}

.data-table tbody tr {
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--transition-fast);
}

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

.data-table tbody tr:hover {
  background: rgba(136, 0, 0, 0.02);
}

@media (max-width: 600px) {
  .app-main {
    padding: 24px 16px 48px;
  }

  .builder-card,
  .taker-card,
  .results-card,
  .auth-wrap {
    padding: 24px;
    border-radius: var(--radius-lg);
  }

  .dashboard-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .list-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    padding: 20px;
  }

  .list-item-actions {
    width: 100%;
    justify-content: flex-end;
  }

  .stats-row {
    grid-template-columns: repeat(2, 1fr);
  }

  .builder-settings-row {
    grid-template-columns: 1fr;
  }

  .choice-grid {
    grid-template-columns: 1fr;
  }

  .result-stats {
    grid-template-columns: 1fr;
  }

  .score-ring {
    width: 140px;
    height: 140px;
  }

  .score-value {
    font-size: 44px;
  }

  .app-header {
    padding: 16px 20px;
  }

  .header-role {
    display: none;
  }
}

/* ---------------------------
   18. UTILITY CLASSES
   --------------------------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}