/* ==========================================================================
   Design tokens: colors, spacing, typography
   ========================================================================== */

:root {
  /* Design system palette (see design-system.md) — light elegant greys; semantic colors for meaning only */
  --color-primary-a10: #f5f6f7;
  --color-primary-a20: #e8e9eb;
  --color-primary-a30: #d0d2d5;
  --color-primary-a40: #8f9296;
  --color-primary-a50: #525558;
  --color-primary-a60: #282a2c;
  --color-accent-a10: #f5f6f7;
  --color-accent-a20: #e8e9eb;
  --color-accent-a30: #d0d2d5;
  --color-accent-a40: #8f9296;
  --color-accent-a50: #525558;
  --color-accent-a60: #282a2c;
  --color-danger-a10: #b41c2b;
  --color-danger-a20: #851d22;
  --color-danger-a30: #581919;
  --color-danger-a40: #2f1310;
  --color-success-a10: #009f42;
  --color-success-a20: #167533;
  --color-success-a30: #184d25;
  --color-success-a40: #132916;
  --color-warning-a10: #f0ad4e;
  --color-warning-a20: #af7f3c;
  --color-warning-a30: #71532a;
  --color-warning-a40: #392b19;
  --color-info-a10: #388cfa;
  --color-info-a20: #3267b5;
  --color-info-a30: #284475;
  --color-info-a40: #1a253b;
  --color-neutral-a10: #ffffff;
  --color-neutral-a20: #e8e9eb;
  --color-neutral-a30: #d0d2d5;
  --color-neutral-a40: #8f9296;
  --color-neutral-a50: #525558;
  --color-neutral-a60: #282a2c;

  /* Light theme: light bg (primary a10), dark text (primary a60), high-contrast borders and surfaces */
  --color-primary: var(--color-primary-a10);
  --color-secondary: var(--color-primary-a60);
  --color-tertiary: var(--color-accent-a60);
  --color-accent: var(--color-accent-a60);
  --color-muted: var(--color-primary-a40);
  --color-border: var(--color-primary-a30);
  --color-border-muted: var(--color-primary-a20);
  --color-surface: var(--color-neutral-a10);
  --color-surface-strong: var(--color-primary-a20);

  --line-height: 1.5;
  --space-1: 0.375rem;
  --space-2: 0.75rem;
  --space-3: 1.125rem;
  --space-4: 1.5rem;
  --space-5: 1.875rem;
  --space-6: 2.25rem;
  --space-7: 2.625rem;
  --space-8: 3rem;

  --text-1: 0.75rem;
  --text-2: 0.875rem;
  --text-3: 1rem;
  --text-4: 1.125rem;
  --text-5: 1.25rem;
  --text-6: 1.5rem;
  /* Typography: minimal — body (--text-3), small (--text-2), page title (--text-5). One weight (400). Hierarchy by color (secondary vs muted). */

  --radius-sm: 6px;
  --radius-md: 10px;
  --border-width: 1px;
  --border-width-thick: 2px;
  --border-width-accent: 3px;

  --navbar-max-width: 680px;
  --navbar-bg: var(--color-primary-a20);
  --transition-shine: 0.3s ease-in-out;
  /* Text on cards/surfaces: same as page for contrast on white */
  --color-text-on-surface: var(--color-primary-a60);
  --color-muted-on-surface: var(--color-primary-a40);
}

/* ==========================================================================
   Fonts
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* ==========================================================================
   Base & layout
   ========================================================================== */

* {
  box-sizing: border-box;
}

html {
  overflow-x: hidden;
}

body {
  font-family: 'Inter', system-ui, sans-serif;
  margin: 0;
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--color-primary);
  color: var(--color-secondary);
  line-height: var(--line-height);
  min-width: 0;
  max-width: 100%;
}

.container {
  max-width: 600px;
  width: 100%;
  min-width: 0;
  margin: 0 auto;
}

/* ==========================================================================
   Navbar
   ========================================================================== */

.navbar {
  width: 100%;
  max-width: 100%;
  margin-bottom: var(--space-6);
}

.navbar-inner {
  max-width: var(--navbar-max-width);
  width: 100%;
  min-width: 0;
  margin: 0 auto;
  padding: var(--space-3) var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  background: var(--navbar-bg);
  border-radius: var(--radius-md);
  border: var(--border-width) solid var(--color-border-muted);
}

.navbar-brand {
  --brand-height: var(--space-4);
  display: inline-flex;
  align-items: flex-end;
  gap: var(--space-2);
  color: var(--color-secondary);
  text-decoration: none;
}

.navbar-brand:hover {
  opacity: 0.85;
}

.navbar-brand-logo,
.navbar-brand-name {
  height: var(--brand-height);
  width: auto;
  display: block;
  vertical-align: bottom;
}

.navbar-brand-logo img,
.navbar-brand-name img {
  height: var(--brand-height);
  width: auto;
  max-width: 100%;
  display: block;
  vertical-align: bottom;
}

.navbar-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  margin: 0;
  background: transparent;
  border: var(--border-width) solid var(--color-border-muted);
  border-radius: var(--radius-sm);
  color: var(--color-secondary);
  cursor: pointer;
}

.navbar-toggle:hover {
  background: var(--color-border-muted);
}

.navbar-toggle-icon {
  display: block;
  width: 1.25rem;
  height: 2px;
  background: currentColor;
  box-shadow: 0 -6px 0 currentColor, 0 6px 0 currentColor;
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.navbar-links a {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: var(--text-2);
  text-transform: uppercase;
  color: var(--color-secondary);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.navbar-links a:hover {
  color: var(--color-tertiary);
}

/* Mobile: hamburger menu */
@media (max-width: 768px) {
  .navbar-toggle {
    display: flex;
  }

  .navbar-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-top: var(--space-1);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-2);
    background: var(--navbar-bg);
    border: var(--border-width) solid var(--color-border-muted);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    display: none;
  }

  .navbar--open .navbar-links {
    display: flex;
  }

  .navbar-inner {
    position: relative;
    flex-wrap: wrap;
  }
}

/* ==========================================================================
   Button shine
   ========================================================================== */

.expanded-view button {
  position: relative;
  overflow: hidden;
}

.expanded-view button::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  opacity: 0.1;
  background: linear-gradient(
    to right,
    transparent 0%,
    var(--color-tertiary) 50%,
    transparent 100%
  );
  transform: skewX(-20deg);
  transition: left var(--transition-shine);
  pointer-events: none;
}

.expanded-view button:hover:not(:disabled)::before,
.expanded-view button:focus-visible:not(:disabled)::before {
  left: 100%;
}

h1, h2, h3, h4 {
  font-family: 'Inter', system-ui, sans-serif;
}

/* ==========================================================================
   Header (shared)
   ========================================================================== */

.header {
  margin-bottom: var(--space-6);
}

.header h1 {
  margin: 0 0 var(--space-1) 0;
  font-size: var(--text-5);
  font-weight: 400;
}

.header h1 a,
.header .brand {
  color: var(--color-secondary);
  text-decoration: none;
}

.header h1 a:hover {
  text-decoration: underline;
}

.header .brand {
  --brand-height: var(--space-4);
  display: inline-flex;
  align-items: flex-end;
  gap: var(--space-2);
}

.header .brand:hover {
  opacity: 0.85;
}

.header .brand-logo,
.header .brand-logo img {
  height: var(--brand-height);
  width: auto;
  display: block;
  vertical-align: bottom;
}

.header .brand-name,
.header .brand-name img {
  height: var(--brand-height);
  width: auto;
  display: block;
  vertical-align: bottom;
}

.header p {
  margin: 0 0 var(--space-3) 0;
  font-size: var(--text-3);
  font-weight: 400;
  color: var(--color-secondary);
}

.header p:last-of-type {
  margin-bottom: 0;
}

.header p a {
  color: var(--color-tertiary);
}

.header ul {
  margin: var(--space-2) 0;
  padding-left: var(--space-5);
  font-size: var(--text-3);
  color: var(--color-secondary);
}

.header ul li {
  margin-bottom: var(--space-1);
}

.header p.detail-meta {
  font-size: var(--text-2);
  color: var(--color-muted);
}

/* ==========================================================================
   Breadcrumb (shared)
   ========================================================================== */

.breadcrumb {
  margin-bottom: var(--space-4);
  font-size: var(--text-2);
  color: var(--color-muted);
}

.breadcrumb a {
  color: var(--color-tertiary);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb span {
  margin: 0 var(--space-1) 0;
  color: var(--color-border);
}

/* Active (current page) segment: same as body text for contrast */
.breadcrumb span:last-of-type {
  color: var(--color-secondary);
}

#index-container #breadcrumb:not(.visible) {
  display: none;
}

/* ==========================================================================
   Index: home cards
   ========================================================================== */

.home-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(12rem, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.home-card {
  padding: var(--space-6);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  box-shadow: 0 12px 12px #00000015;
  cursor: pointer;
  font-family: inherit;
  font-size: var(--text-3);
  font-weight: 400;
  color: var(--color-text-on-surface);
  text-align: center;
  transition: border-color 0.15s ease;
}

.home-card:hover {
  border-color: var(--color-tertiary);
}

.home-card-link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.home-card-link:hover {
  color: inherit;
}

.container.view-expanded .home-cards {
  display: none;
}

.container.view-expanded #homeHeader {
  display: none;
}

/* ==========================================================================
   Index: Probabilistic thinking (list & game)
   ========================================================================== */

.probability-list {
  margin-top: var(--space-4);
}

.probability-scenario-wrap {
  position: relative;
  width: 100%;
}

.probability-scenario-wrap .expanded-view-next {
  position: absolute;
  left: 100%;
  top: 0;
  margin-left: var(--space-4);
  padding-top: var(--space-2);
}

.probability-scenario-wrap .expanded-view-next button,
.probability-scenario-wrap .expanded-view-next a.quiz-next-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-family: inherit;
  font-size: var(--text-2);
  color: var(--color-muted);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
}

.probability-scenario-wrap .expanded-view-next button:hover,
.probability-scenario-wrap .expanded-view-next a.quiz-next-btn:hover {
  color: var(--color-tertiary);
}

.probability-scenario-wrap .expanded-view-next .quiz-next-icon {
  width: 1rem;
  height: 1rem;
  color: inherit;
}

.probability-scenario-wrap .expanded-view-next .quiz-next-icon svg {
  display: block;
  width: 100%;
  height: 100%;
}

.probability-game {
  display: flex;
  flex-direction: column;
  height: min(75vh, 600px);
  max-height: min(75vh, 600px);
  min-height: 280px;
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0;
  background: var(--color-surface);
  box-shadow: 0 4px 4px #00000030, 0 12px 12px #00000015;
  overflow: hidden;
}

/* Scroll region: fixed size from flex (never grows with content), so long text and extra clues scroll inside */
.probability-game-scroll {
  flex: 1 1 0%;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  padding: var(--space-6);
}

.probability-game-title {
  margin: 0 0 var(--space-2) 0;
  font-size: var(--text-3);
  color: var(--color-text-on-surface);
}

.probability-game-intro {
  font-size: var(--text-2);
  color: var(--color-muted-on-surface);
  margin: 0 0 var(--space-4) 0;
  line-height: var(--line-height);
}

.probability-game-scenario {
  font-size: var(--text-3);
  color: var(--color-text-on-surface);
  line-height: var(--line-height);
  margin-bottom: var(--space-6);
}

.probability-game-scenario p {
  margin: 0 0 var(--space-3) 0;
}

.probability-game-scenario p:last-child {
  margin-bottom: 0;
}

.probability-game-clues {
  margin-top: 0;
}

.probability-game-clue-block {
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: var(--border-width) solid var(--color-border-muted);
}

.probability-game-clue-block h4 {
  margin: 0 0 var(--space-2) 0;
  font-size: var(--text-3);
  color: var(--color-text-on-surface);
}

.probability-game-clue-block p {
  margin: 0;
  font-size: var(--text-3);
  line-height: var(--line-height);
  color: var(--color-muted-on-surface);
}

.probability-game-fixed {
  flex: 0 0 auto;
  padding: var(--space-4) var(--space-6);
  background: var(--color-surface-strong);
  border-top: var(--border-width) solid var(--color-border);
}

.probability-outcomes-prompt {
  font-size: var(--text-3);
  color: var(--color-text-on-surface);
  margin: 0 0 var(--space-2) 0;
}

.probability-outcomes-sum {
  font-size: var(--text-2);
  color: var(--color-muted-on-surface);
  margin: 0 0 var(--space-3) 0;
}

.probability-outcomes-sum.probability-sum-error {
  color: var(--color-danger-a10);
}

.probability-outcomes-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.probability-outcome-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.probability-outcome-row label {
  flex: 1;
  min-width: 0;
  font-size: var(--text-2);
  color: var(--color-text-on-surface);
}

.probability-outcome-input {
  width: 4rem;
  padding: var(--space-1) var(--space-2);
  font-family: inherit;
  font-size: var(--text-2);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-secondary);
}

.probability-outcome-input:focus {
  outline: none;
  border-color: var(--color-tertiary);
}

.probability-game-resolution {
  margin-top: var(--space-6);
  padding: var(--space-4);
  background: var(--color-surface-strong);
  border-radius: var(--radius-sm);
  border-left: var(--border-width-accent) solid var(--color-success-a10);
}

.probability-game-resolution h4 {
  margin: 0 0 var(--space-2) 0;
  font-size: var(--text-3);
  color: var(--color-text-on-surface);
}

.probability-game-resolution p {
  margin: 0 0 var(--space-2) 0;
  font-size: var(--text-2);
  line-height: var(--line-height);
  color: var(--color-muted-on-surface);
}

.probability-game-resolution p:last-child {
  margin-bottom: 0;
}

.probability-feedback {
  margin-top: var(--space-4);
  font-size: var(--text-2);
  color: var(--color-muted-on-surface);
  line-height: var(--line-height);
}

.probability-rational-notes {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: var(--border-width) solid var(--color-border-muted);
}

.probability-rational-notes h4 {
  margin: 0 0 var(--space-2) 0;
  font-size: var(--text-3);
  color: var(--color-text-on-surface);
}

.probability-rational-notes p {
  margin: 0 0 var(--space-2) 0;
  font-size: var(--text-2);
  color: var(--color-muted-on-surface);
  line-height: var(--line-height);
}

.probability-game-actions {
  margin-top: var(--space-4);
}

.probability-btn {
  padding: var(--space-2) var(--space-4);
  font-family: inherit;
  font-size: var(--text-2);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-secondary);
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.probability-btn:hover {
  border-color: var(--color-tertiary);
  color: var(--color-tertiary);
}

.probability-btn-primary {
  border-color: var(--color-tertiary);
  color: var(--color-tertiary);
}

.probability-btn-primary:hover {
  background: color-mix(in srgb, var(--color-tertiary) 12%, var(--color-primary));
}

/* ==========================================================================
   Index: expanded view & quiz
   ========================================================================== */

.expanded-view {
  display: none;
  padding: var(--space-4) 0;
  position: relative;
  width: 100%;
}

.expanded-view.active {
  display: block;
}

.expanded-view-main {
  max-width: 600px;
}

.expanded-view-next {
  position: absolute;
  left: 100%;
  top: 0;
  margin-left: var(--space-4);
  padding-top: var(--space-2);
}

.expanded-view-next button,
.expanded-view-next a.quiz-next-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-family: inherit;
  font-size: var(--text-2);
  color: var(--color-muted);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
}

.expanded-view-next button:hover,
.expanded-view-next a.quiz-next-btn:hover {
  color: var(--color-tertiary);
}

.expanded-view-next .quiz-next-icon {
  width: 1rem;
  height: 1rem;
  color: inherit;
}

.expanded-view-next .quiz-next-icon svg {
  display: block;
  width: 100%;
  height: 100%;
}

/* Mobile: Next button above quiz, right-aligned, smaller (avoids viewport overflow) */
@media (max-width: 640px) {
  .expanded-view.active {
    display: flex;
    flex-direction: column;
  }

  .expanded-view-next {
    position: static;
    order: -1;
    margin-left: 0;
    margin-bottom: var(--space-2);
    padding-top: 0;
    display: flex;
    justify-content: flex-end;
  }

  .expanded-view-next button,
  .expanded-view-next a.quiz-next-btn {
    padding: var(--space-1) var(--space-2);
    font-size: var(--text-1);
  }

  .expanded-view-next .quiz-next-icon {
    width: 0.875rem;
    height: 0.875rem;
  }
}

.expanded-view .card-detail {
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-6);
  background: var(--color-surface);
  box-shadow: 0 12px 12px #00000015;
  margin-top: 0;
}

.expanded-view .card-detail .meta {
  font-size: var(--text-2);
  color: var(--color-muted-on-surface);
  margin-bottom: var(--space-4);
}

.expanded-view .card-detail .content {
  font-size: var(--text-3);
  color: var(--color-text-on-surface);
  line-height: var(--line-height);
  margin-bottom: var(--space-6);
}

.expanded-view .syllogism {
  margin: 0;
}

.expanded-view .syllogism-line {
  margin: 0 0 var(--space-2) 0;
}

.expanded-view .syllogism-line:last-child {
  margin-bottom: 0;
}

.expanded-view .syllogism-line strong {
  color: var(--color-text-on-surface);
  font-weight: 400;
}

.expanded-view .syllogism-fallback {
  margin: 0;
}

.expanded-view .card-quiz {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: var(--border-width) solid var(--color-border-muted);
}

.expanded-view .card-quiz h4 {
  margin: 0 0 var(--space-2) 0;
  font-size: var(--text-3);
  font-weight: 400;
  color: var(--color-text-on-surface);
}

.expanded-view .quiz-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.expanded-view .quiz-option-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.expanded-view .quiz-option-row .quiz-option {
  flex: 1;
  min-width: 0;
}

.expanded-view .quiz-option-info {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  color: var(--color-muted);
  text-decoration: none;
  border-radius: 50%;
  border: var(--border-width) solid var(--color-border);
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.expanded-view .quiz-option .quiz-option-info {
  vertical-align: super;
  width: auto;
  height: auto;
  min-width: 1.25em;
  min-height: 1.25em;
  padding: 0 0.15em;
  margin-left: 0.15em;
  font-size: 0.75em;
  line-height: 1;
}

.expanded-view .quiz-option .quiz-option-info-icon {
  font-size: inherit;
}

.expanded-view .quiz-option-info:hover {
  color: var(--color-tertiary);
  border-color: var(--color-tertiary);
  background: color-mix(in srgb, var(--color-tertiary) 12%, transparent);
}

.expanded-view .quiz-option-info-icon {
  font-size: var(--text-1);
  font-weight: 400;
  line-height: 1;
}

.expanded-view .quiz-option {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  text-align: left;
  padding: var(--space-2) var(--space-3);
  font-family: inherit;
  font-size: var(--text-3);
  color: var(--color-secondary);
  background: var(--color-primary);
  border: var(--border-width-thick) solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.expanded-view .quiz-option:hover:not(:disabled) {
  border-color: var(--color-tertiary);
}

.expanded-view .quiz-option .quiz-icon {
  flex-shrink: 0;
  width: 1.125rem;
  height: 1.125rem;
  color: inherit;
}

.expanded-view .quiz-option .quiz-icon svg {
  display: block;
  width: 100%;
  height: 100%;
}

.expanded-view .quiz-option.correct {
  border-color: var(--color-success-a10);
  background: color-mix(in srgb, var(--color-success-a10) 18%, var(--color-primary));
  color: var(--color-secondary);
  cursor: default;
}

.expanded-view .quiz-option.incorrect {
  border-color: var(--color-danger-a10);
  background: color-mix(in srgb, var(--color-danger-a10) 15%, var(--color-primary));
  color: var(--color-secondary);
  cursor: default;
}

.expanded-view .quiz-option:disabled {
  cursor: default;
}

.expanded-view .quiz-reveal {
  margin-top: var(--space-2);
  padding: var(--space-3);
  background: var(--color-surface-strong);
  border-radius: var(--radius-sm);
  border-left: var(--border-width-accent) solid var(--color-tertiary);
}

.expanded-view .quiz-reveal h4 {
  margin: 0 0 var(--space-1) 0;
  font-size: var(--text-2);
  color: var(--color-text-on-surface);
}

.expanded-view .quiz-reveal .quiz-explanation {
  margin: 0;
  font-size: var(--text-2);
  color: var(--color-muted-on-surface);
  line-height: var(--line-height);
}

.expanded-view .quiz-reveal .quiz-explanation.quiz-unsound {
  margin-top: var(--space-2);
}

/* Shared: Next / Back (Spot where reasoning breaks detail page) */
.quiz-next-wrap {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-top: var(--space-4);
  margin-bottom: var(--space-4);
  font-size: var(--text-2);
}

.quiz-next-wrap .quiz-next-back,
.quiz-next-wrap button.quiz-next-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-family: inherit;
  font-size: var(--text-2);
  color: var(--color-muted);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
}

.quiz-next-wrap .quiz-next-back:hover,
.quiz-next-wrap button.quiz-next-btn:hover {
  color: var(--color-tertiary);
}

.quiz-next-wrap .quiz-next-icon {
  width: 1rem;
  height: 1rem;
  color: inherit;
}

.quiz-next-wrap .quiz-next-icon svg {
  display: block;
  width: 100%;
  height: 100%;
}

.detail-page .quiz-next-wrap {
  justify-content: space-between;
  margin-top: var(--space-4);
}

/* ==========================================================================
   Fallacies page
   ========================================================================== */

.category-block {
  margin-bottom: var(--space-6);
}

.category-heading {
  margin: 0 0 var(--space-2) 0;
  font-size: var(--text-4);
  font-weight: 400;
  color: var(--color-tertiary);
}

.subcategory-toggle {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: var(--space-2);
  width: 100%;
  padding: 0;
  margin: 0;
  font: inherit;
  font-family: 'Inter', system-ui, sans-serif;
  text-align: left;
  background: none;
  border: none;
  cursor: pointer;
  color: inherit;
  font-size: var(--text-3);
  font-weight: 400;
  color: var(--color-secondary);
  margin: 0 0 var(--space-2) 0;
}

.subcategory-toggle:hover {
  color: var(--color-tertiary);
}

.toggle-icon {
  display: inline-block;
  transition: transform 0.2s ease;
}

.subcategory:not([open]) .subcategory-toggle .toggle-icon {
  transform: rotate(-90deg);
}

.category-content {
  margin-bottom: var(--space-2);
}

.intro {
  margin: 0 0 var(--space-3) 0;
  font-size: var(--text-3);
  color: var(--color-secondary);
}

.group-intro {
  margin: 0 0 var(--space-2) 0;
  font-size: var(--text-2);
  color: var(--color-muted);
}

.subcategory {
  margin-bottom: var(--space-4);
}

.fallacy-list {
  list-style: disc;
  padding-left: var(--space-4);
  margin: 0 0 var(--space-4) 0;
}

.fallacy-list li {
  font-size: var(--text-3);
  color: var(--color-secondary);
  padding: var(--space-1) 0;
}

.fallacy-item {
  display: inline;
  padding: 0;
  margin: 0;
  font: inherit;
  color: var(--color-tertiary);
  background: none;
  border: none;
  cursor: pointer;
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-underline-offset: 2px;
}

.fallacy-item:hover {
  color: var(--color-secondary);
  text-decoration-color: var(--color-tertiary);
}

.fallacy-detail {
  margin-top: var(--space-2);
  padding: var(--space-3);
  background: var(--color-surface-strong);
  border-radius: var(--radius-sm);
  border-left: var(--border-width-accent) solid var(--color-tertiary);
  font-size: var(--text-3);
  color: var(--color-text-on-surface);
}

.fallacy-detail p {
  margin: 0 0 var(--space-2) 0;
}

.fallacy-detail p:last-child {
  margin-bottom: 0;
}

.fallacy-detail strong {
  color: var(--color-text-on-surface);
}

/* Biases page */
.bias-list {
  list-style: disc;
  padding-left: var(--space-4);
  margin: 0 0 var(--space-4) 0;
}

.bias-list li {
  font-size: var(--text-3);
  color: var(--color-secondary);
  padding: var(--space-1) 0;
}

.bias-item {
  display: inline;
  padding: 0;
  margin: 0;
  font: inherit;
  color: var(--color-tertiary);
  background: none;
  border: none;
  cursor: pointer;
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-underline-offset: 2px;
}

.bias-item:hover {
  color: var(--color-secondary);
  text-decoration-color: var(--color-tertiary);
}

.bias-detail {
  margin-top: var(--space-2);
  padding: var(--space-3);
  background: var(--color-surface-strong);
  border-radius: var(--radius-sm);
  border-left: var(--border-width-accent) solid var(--color-tertiary);
  font-size: var(--text-3);
  color: var(--color-text-on-surface);
}

.bias-detail p {
  margin: 0 0 var(--space-2) 0;
}

.bias-detail p:last-child {
  margin-bottom: 0;
}

.bias-detail strong {
  color: var(--color-text-on-surface);
}

/* Detail subpages */
.detail-page {
  margin-top: var(--space-4);
}

.detail-page .header {
  margin-bottom: var(--space-6);
}

.detail-meta {
  font-size: var(--text-2);
  color: var(--color-muted);
  font-weight: 400;
  margin-top: var(--space-1);
}

.detail-content {
  margin-bottom: var(--space-6);
}

.detail-content-card {
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-6);
  background: var(--color-surface);
  box-shadow: 0 12px 12px #00000015;
}

.detail-content-card .detail-section-title {
  margin: 0 0 var(--space-3) 0;
  font-size: var(--text-3);
  font-weight: 400;
  color: var(--color-text-on-surface);
}

.detail-content-card .detail-section-body {
  margin: 0;
  font-size: var(--text-3);
  line-height: var(--line-height);
  color: var(--color-text-on-surface);
}

.detail-content-card .detail-section-body + .detail-section-body {
  margin-top: var(--space-3);
}

.detail-content-card + .detail-content-card {
  margin-top: var(--space-6);
}

.detail-example-cards {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}

.detail-content-card .detail-example-card {
  border: none;
  box-shadow: none;
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface-strong);
  border-radius: var(--radius-sm);
  border-left: var(--border-width-thick) solid var(--color-accent-a30);
}

.detail-example-card p {
  margin: 0;
  font-size: var(--text-3);
  line-height: var(--line-height);
  color: var(--color-text-on-surface);
}

.back-link {
  margin-top: var(--space-6);
  font-size: var(--text-2);
}

.back-link a {
  color: var(--color-tertiary);
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-underline-offset: 2px;
}

.back-link a:hover {
  color: var(--color-secondary);
  text-decoration-color: var(--color-tertiary);
}

/* ==========================================================================
   Error Analysis (Spot where reasoning breaks)
   ========================================================================== */

.error-analysis-scenario-wrap {
  position: relative;
  width: 100%;
}

.error-analysis-scenario-main {
  max-width: 600px;
}

.error-analysis-scenario-wrap .expanded-view-next {
  position: absolute;
  left: 100%;
  top: 0;
  margin-left: var(--space-4);
  padding-top: var(--space-2);
}

.error-analysis-scenario-wrap .expanded-view-next button,
.error-analysis-scenario-wrap .expanded-view-next a.quiz-next-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-family: inherit;
  font-size: var(--text-2);
  color: var(--color-muted);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
}

.error-analysis-scenario-wrap .expanded-view-next button:hover,
.error-analysis-scenario-wrap .expanded-view-next a.quiz-next-btn:hover {
  color: var(--color-tertiary);
}

.error-analysis-scenario-wrap .expanded-view-next .quiz-next-icon {
  width: 1rem;
  height: 1rem;
  color: inherit;
}

.error-analysis-scenario-wrap .expanded-view-next .quiz-next-icon svg {
  display: block;
  width: 100%;
  height: 100%;
}

.error-analysis-list {
  list-style: none;
  padding: 0;
  margin: var(--space-4) 0 0 0;
}

.error-analysis-list li {
  margin-bottom: var(--space-2);
}

.error-analysis-list a {
  color: var(--color-tertiary);
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-underline-offset: 2px;
  font-size: var(--text-3);
}

.error-analysis-list a:hover {
  color: var(--color-secondary);
  text-decoration-color: var(--color-tertiary);
}

.error-analysis-instruction {
  font-size: var(--text-2);
  color: var(--color-muted);
  margin: 0 0 var(--space-4) 0;
}

.error-analysis-lines {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-4) 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.error-analysis-lines li {
  margin: 0;
}

.error-analysis-line {
  display: block;
  width: 100%;
  text-align: left;
  padding: var(--space-3) var(--space-4);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  font-family: inherit;
  font-size: var(--text-2);
  line-height: var(--line-height);
  color: var(--color-text-on-surface);
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.error-analysis-line:hover:not(:disabled) {
  border-color: var(--color-tertiary);
}

.error-analysis-line:disabled {
  cursor: default;
}

.error-analysis-line.correct {
  border-color: var(--color-success-a10);
  background: color-mix(in srgb, var(--color-success-a10) 18%, var(--color-primary));
}

.error-analysis-line.incorrect {
  border-color: var(--color-danger-a10);
  background: color-mix(in srgb, var(--color-danger-a10) 15%, var(--color-primary));
}

.error-analysis-feedback {
  margin: var(--space-4) 0;
  padding: var(--space-4);
  border-radius: var(--radius-sm);
  font-size: var(--text-2);
}

.error-analysis-feedback.correct {
  border: var(--border-width) solid var(--color-success-a10);
  background: color-mix(in srgb, var(--color-success-a10) 12%, var(--color-primary));
  color: var(--color-text-on-surface);
}

.error-analysis-feedback.incorrect {
  border: var(--border-width) solid var(--color-danger-a10);
  background: color-mix(in srgb, var(--color-danger-a10) 12%, var(--color-primary));
  color: var(--color-text-on-surface);
}

.error-analysis-explanation {
  margin: 0;
}

.error-analysis-refs {
  margin: var(--space-2) 0 0;
  font-size: var(--text-1);
  opacity: 0.9;
}

.error-analysis-refs a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.error-analysis-actions {
  margin-top: var(--space-4);
  font-size: var(--text-2);
}

.error-analysis-actions .button-link,
.button-link {
  background: none;
  border: none;
  padding: 0;
  font-family: inherit;
  font-size: inherit;
  color: var(--color-tertiary);
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-underline-offset: 2px;
  cursor: pointer;
}

.error-analysis-actions .button-link:hover,
.button-link:hover {
  color: var(--color-secondary);
  text-decoration-color: var(--color-tertiary);
}

/* ==========================================================================
   Estimation (Fermi / Guesstimate Challenge)
   ========================================================================== */

.fermi-list {
  list-style: none;
  padding: 0;
  margin: var(--space-6) 0 0 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.fermi-card {
  display: block;
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-4);
  background: var(--color-surface);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s ease;
}

.fermi-card:hover {
  border-color: var(--color-tertiary);
}

.fermi-card-title {
  display: block;
  font-size: var(--text-3);
  font-weight: 400;
  color: var(--color-text-on-surface);
  margin-bottom: var(--space-1);
}

.fermi-card-question {
  display: block;
  font-size: var(--text-2);
  color: var(--color-muted-on-surface);
}

.fermi-question {
  font-size: var(--text-3);
  color: var(--color-text-on-surface);
  margin: var(--space-2) 0 var(--space-4) 0;
}

.fermi-canvas {
  margin-top: var(--space-6);
  padding: var(--space-6);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: var(--space-3) var(--space-4);
}

.fermi-step {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  min-width: 10rem;
}

.fermi-step-label {
  font-size: var(--text-2);
  color: var(--color-muted-on-surface);
}

.fermi-step-hint {
  font-size: var(--text-1);
  color: var(--color-tertiary);
  cursor: help;
  margin-left: var(--space-1);
}

.fermi-step-input-wrap {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
}

.fermi-input {
  font-size: var(--text-3);
  padding: var(--space-2) var(--space-3);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-secondary);
  min-width: 6rem;
  max-width: 12rem;
}

.fermi-input:focus {
  outline: none;
  border-color: var(--color-tertiary);
}

.fermi-unit {
  font-size: var(--text-2);
  color: var(--color-muted-on-surface);
}

.fermi-op {
  font-size: var(--text-3);
  color: var(--color-muted-on-surface);
  align-self: center;
  margin: 0 var(--space-1);
}

.fermi-result {
  margin-top: var(--space-6);
  font-size: var(--text-3);
  color: var(--color-muted);
}

.fermi-result-visible {
  color: var(--color-secondary);
}

.fermi-result strong {
  color: var(--color-secondary);
}

.fermi-reveal {
  margin-top: var(--space-6);
  padding: var(--space-4);
  background: var(--color-surface-strong);
  border-radius: var(--radius-sm);
  border-left: var(--border-width-accent) solid var(--color-tertiary);
}

.fermi-reveal summary {
  font-size: var(--text-2);
  color: var(--color-tertiary);
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.fermi-reveal-body {
  margin-top: var(--space-3);
  font-size: var(--text-2);
  color: var(--color-muted);
}

.fermi-reveal-body p {
  margin: 0 0 var(--space-2) 0;
}

.fermi-reveal-body p:last-child {
  margin-bottom: 0;
}

.fallacy-list a.fallacy-item,
.bias-list a.bias-item {
  background: none;
  border: none;
  cursor: pointer;
}