/* ============================================================
   Measles: A Complete Learning Guide
   Design system + component styles
   ============================================================ */

:root {
  /* Type scale (fluid) */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --content-narrow: 680px;
  --content-default: 1000px;
  --content-wide: 1240px;

  /* Fonts */
  --font-display: 'Clash Display', 'Georgia', serif;
  --font-body: 'General Sans', 'Helvetica Neue', system-ui, sans-serif;
}

/* ---- Light theme (clinical, public-health teal) ---- */
:root,
[data-theme='light'] {
  --color-bg: #f4f7f7;
  --color-surface: #ffffff;
  --color-surface-2: #fbfcfc;
  --color-surface-offset: #eaf0f0;
  --color-surface-offset-2: #dfe8e8;
  --color-divider: #d7e0e0;
  --color-border: #c8d4d4;

  --color-text: #16302f;
  --color-text-muted: #56706e;
  --color-text-faint: #9fb2b0;
  --color-text-inverse: #f6fafa;

  --color-primary: #0d7377;
  --color-primary-hover: #0a595c;
  --color-primary-active: #08484a;
  --color-primary-highlight: #cfe6e6;

  /* Measles rash accent — a warm coral/red, used sparingly */
  --color-accent: #d64545;
  --color-accent-hover: #b83636;
  --color-accent-highlight: #f6d9d9;

  --color-warning: #b26a00;
  --color-warning-highlight: #f0e2c6;
  --color-success: #2f8f4e;
  --color-success-highlight: #cfe8d6;
  --color-error: #c23b3b;
  --color-error-highlight: #f3d4d4;

  --shadow-sm: 0 1px 2px rgba(16, 40, 40, 0.06);
  --shadow-md: 0 4px 14px rgba(16, 40, 40, 0.09);
  --shadow-lg: 0 14px 38px rgba(16, 40, 40, 0.14);
}

/* ---- Dark theme ---- */
[data-theme='dark'] {
  --color-bg: #0e1717;
  --color-surface: #14201f;
  --color-surface-2: #182625;
  --color-surface-offset: #16221f;
  --color-surface-offset-2: #1c2a28;
  --color-divider: #22302e;
  --color-border: #2c3b39;

  --color-text: #d5e2e0;
  --color-text-muted: #7f9694;
  --color-text-faint: #566866;
  --color-text-inverse: #0e1717;

  --color-primary: #38b2b6;
  --color-primary-hover: #4fc4c8;
  --color-primary-active: #2c9599;
  --color-primary-highlight: #1e3634;

  --color-accent: #e57373;
  --color-accent-hover: #ef8686;
  --color-accent-highlight: #3a2626;

  --color-warning: #d99a3a;
  --color-warning-highlight: #3a3020;
  --color-success: #5fb97b;
  --color-success-highlight: #22352a;
  --color-error: #e06767;
  --color-error-highlight: #3a2525;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 14px 38px rgba(0, 0, 0, 0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #0e1717;
    --color-surface: #14201f;
    --color-surface-2: #182625;
    --color-surface-offset: #16221f;
    --color-surface-offset-2: #1c2a28;
    --color-divider: #22302e;
    --color-border: #2c3b39;
    --color-text: #d5e2e0;
    --color-text-muted: #7f9694;
    --color-text-faint: #566866;
    --color-text-inverse: #0e1717;
    --color-primary: #38b2b6;
    --color-primary-hover: #4fc4c8;
    --color-primary-active: #2c9599;
    --color-primary-highlight: #1e3634;
    --color-accent: #e57373;
    --color-accent-hover: #ef8686;
    --color-accent-highlight: #3a2626;
    --color-warning: #d99a3a;
    --color-warning-highlight: #3a3020;
    --color-success: #5fb97b;
    --color-success-highlight: #22352a;
    --color-error: #e06767;
    --color-error-highlight: #3a2525;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 14px 38px rgba(0, 0, 0, 0.5);
  }
}

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

html {
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  min-height: 100dvh;
  line-height: 1.65;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color 0.3s ease, color 0.3s ease;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

ul[role='list'],
ol[role='list'] {
  list-style: none;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

h1,
h2,
h3,
h4 {
  text-wrap: balance;
  line-height: 1.15;
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.01em;
}

p,
li {
  text-wrap: pretty;
}

a {
  color: var(--color-primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

::selection {
  background: var(--color-primary-highlight);
  color: var(--color-text);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

button {
  cursor: pointer;
  background: none;
  border: none;
}

a,
button,
[role='button'],
input,
select {
  transition:
    color var(--transition-interactive),
    background var(--transition-interactive),
    border-color var(--transition-interactive),
    transform var(--transition-interactive),
    box-shadow var(--transition-interactive);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

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

/* ============================================================
   Layout helpers
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.container-narrow {
  max-width: var(--content-narrow);
}

.section {
  padding-block: clamp(var(--space-12), 6vw, var(--space-24));
}

/* ============================================================
   Header / Nav
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--color-surface) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-divider);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  height: 4rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-lg);
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.brand svg {
  flex-shrink: 0;
  color: var(--color-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-link {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  border-radius: var(--radius-md);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
  background: var(--color-primary-highlight);
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
}

.icon-btn:hover {
  color: var(--color-primary);
  background: var(--color-surface-offset);
}

.nav-toggle {
  display: none;
}

@media (max-width: 860px) {
  .nav-links {
    position: fixed;
    inset: 4rem 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-divider);
    padding: var(--space-2);
    box-shadow: var(--shadow-md);
    transform: translateY(-120%);
    transition: transform 0.28s ease;
  }
  .nav-links.open {
    transform: translateY(0);
  }
  .nav-link {
    padding: var(--space-3) var(--space-4);
  }
  .nav-toggle {
    display: grid;
  }
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  border: 1px solid transparent;
}

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

.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-ghost {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(var(--space-16), 10vw, var(--space-32));
  background:
    radial-gradient(ellipse 80% 60% at 70% 10%, var(--color-primary-highlight), transparent 60%),
    var(--color-bg);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-12);
  align-items: center;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-highlight);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-5);
}

.hero h1 {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-5);
}

.hero-lead {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 46ch;
  margin-bottom: var(--space-8);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-8);
}

.hero-stat .num {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-accent);
  line-height: 1;
}

.hero-stat .label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

.hero-visual {
  position: relative;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
}

.hero-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

@media (max-width: 860px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .hero-visual {
    order: -1;
    max-width: 360px;
    margin-inline: auto;
  }
}

/* ============================================================
   Section headings
   ============================================================ */
.section-head {
  max-width: 60ch;
  margin-bottom: var(--space-10);
}

.section-eyebrow {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.section-head h2 {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-3);
}

.section-head p {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
}

/* ============================================================
   Module cards grid
   ============================================================ */
.modules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-6);
}

.module-card {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  text-align: left;
  text-decoration: none;
  color: inherit;
  transition: transform var(--transition-interactive), box-shadow var(--transition-interactive), border-color var(--transition-interactive);
}

.module-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.module-card-media {
  aspect-ratio: 16 / 9;
  background: var(--color-surface-offset);
  position: relative;
  overflow: hidden;
}

.module-card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.module-num {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: #fff;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-sm);
}

.module-card-body {
  padding: var(--space-5) var(--space-5) var(--space-6);
  display: flex;
  flex-direction: column;
  flex: 1;
}

.module-card-body h3 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-2);
}

.module-card-body p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  flex: 1;
}

.module-card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  font-weight: 600;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  background: var(--color-surface-offset);
  color: var(--color-text-muted);
}

.chip.done {
  background: var(--color-success-highlight);
  color: var(--color-success);
}

.arrow {
  color: var(--color-primary);
  font-weight: 700;
}

/* ============================================================
   Module detail (reading view)
   ============================================================ */
.reader {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: var(--space-12);
  align-items: start;
}

.reader-toc {
  position: sticky;
  top: 5rem;
  font-size: var(--text-sm);
}

.reader-toc h4 {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-faint);
  margin-bottom: var(--space-3);
}

.reader-toc a {
  display: block;
  padding: var(--space-2) var(--space-3);
  color: var(--color-text-muted);
  text-decoration: none;
  border-left: 2px solid var(--color-divider);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.reader-toc a:hover,
.reader-toc a.active {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  background: var(--color-primary-highlight);
}

/* The "Take the quiz" button lives inside the TOC — keep button styling,
   not the muted TOC-link styling (no left border, white text on teal). */
.reader-toc .btn {
  display: inline-flex;
  border-left: none;
  border-radius: var(--radius-md);
}

.reader-toc .btn-primary {
  color: #fff;
  background: var(--color-primary);
}

.reader-toc .btn-primary:hover {
  color: #fff;
  background: var(--color-primary-hover);
}

.reader-body {
  max-width: var(--content-narrow);
}

.reader-body h2 {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-3);
}

.reader-body h3 {
  font-size: var(--text-lg);
  margin-top: var(--space-10);
  margin-bottom: var(--space-3);
  color: var(--color-primary);
}

.reader-body p {
  margin-bottom: var(--space-5);
  color: var(--color-text);
}

.reader-body .lead {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
}

.reader-figure {
  margin-block: var(--space-8);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-surface-offset);
}

.reader-figure img {
  width: 100%;
}

.reader-figure figcaption {
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  background: var(--color-surface);
}

/* Responsive 16:9 video embed */
.video-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
}

.video-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* In-module detailed timeline */
.mini-timeline {
  position: relative;
  margin-block: var(--space-6);
  padding-left: var(--space-5);
  border-left: 2px solid var(--color-divider);
}

.mt-item {
  position: relative;
  padding-bottom: var(--space-6);
}

.mt-item:last-child {
  padding-bottom: 0;
}

.mt-item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--space-5) - 6px);
  top: 4px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--color-surface);
  border: 3px solid var(--color-accent);
}

.mt-date {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--color-primary);
  margin-bottom: var(--space-1);
}

.mt-body p {
  margin-bottom: var(--space-1);
  font-size: var(--text-sm);
}

.mt-src {
  font-size: var(--text-xs);
}

.mt-src a {
  word-break: break-word;
}

.keyfacts {
  margin-block: var(--space-8);
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  background: var(--color-surface-offset);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
}

.keyfacts h4 {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.keyfacts ul {
  list-style: none;
  display: grid;
  gap: var(--space-3);
}

.keyfacts li {
  position: relative;
  padding-left: var(--space-6);
  font-size: var(--text-sm);
}

.keyfacts li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
}

.callout {
  margin-block: var(--space-6);
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
  background: var(--color-warning-highlight);
  border-left: 4px solid var(--color-warning);
  font-size: var(--text-sm);
}

.reader-nav {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  margin-top: var(--space-16);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-divider);
}

.sources {
  margin-top: var(--space-10);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-divider);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.sources h4 {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-3);
  color: var(--color-text-faint);
}

.sources ol {
  padding-left: var(--space-5);
  display: grid;
  gap: var(--space-2);
}

.sources a {
  word-break: break-word;
}

@media (max-width: 860px) {
  .reader {
    grid-template-columns: 1fr;
  }
  .reader-toc {
    position: static;
    display: none;
  }
}

/* ============================================================
   Quiz
   ============================================================ */
.quiz-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  box-shadow: var(--shadow-sm);
  max-width: var(--content-narrow);
  margin-inline: auto;
}

.quiz-progress {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.quiz-bar {
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--color-surface-offset-2);
  overflow: hidden;
  margin-bottom: var(--space-8);
}

.quiz-bar span {
  display: block;
  height: 100%;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  transition: width 0.4s ease;
}

.quiz-question {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  margin-bottom: var(--space-6);
}

.quiz-options {
  display: grid;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.quiz-option {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  padding: var(--space-4) var(--space-5);
  text-align: left;
  font-size: var(--text-base);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  color: var(--color-text);
}

.quiz-option:hover:not(:disabled) {
  border-color: var(--color-primary);
  background: var(--color-primary-highlight);
}

.quiz-option .marker {
  display: grid;
  place-items: center;
  width: 1.75rem;
  height: 1.75rem;
  flex-shrink: 0;
  border-radius: var(--radius-full);
  border: 1.5px solid var(--color-border);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
}

.quiz-option.correct {
  border-color: var(--color-success);
  background: var(--color-success-highlight);
}

.quiz-option.correct .marker {
  background: var(--color-success);
  border-color: var(--color-success);
  color: #fff;
}

.quiz-option.wrong {
  border-color: var(--color-error);
  background: var(--color-error-highlight);
}

.quiz-option.wrong .marker {
  background: var(--color-error);
  border-color: var(--color-error);
  color: #fff;
}

.quiz-feedback {
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  margin-bottom: var(--space-6);
  display: none;
}

.quiz-feedback.show {
  display: block;
}

.quiz-feedback.ok {
  background: var(--color-success-highlight);
  border-left: 4px solid var(--color-success);
}

.quiz-feedback.no {
  background: var(--color-error-highlight);
  border-left: 4px solid var(--color-error);
}

.quiz-feedback strong {
  display: block;
  margin-bottom: var(--space-1);
}

.quiz-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
}

.quiz-result {
  text-align: center;
}

.quiz-score-ring {
  width: 160px;
  height: 160px;
  margin: 0 auto var(--space-6);
}

.quiz-result h3 {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-2);
}

.quiz-result p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}

/* ============================================================
   Timeline
   ============================================================ */
.timeline {
  position: relative;
  max-width: var(--content-default);
  margin-inline: auto;
  padding-left: var(--space-4);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(var(--color-primary), var(--color-accent));
}

.tl-item {
  position: relative;
  padding-left: var(--space-8);
  padding-bottom: var(--space-10);
}

.tl-item::before {
  content: '';
  position: absolute;
  left: -6px;
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-surface);
  border: 3px solid var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-bg);
}

.tl-item.era::before {
  border-color: var(--color-accent);
}

.tl-year {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--space-1);
}

.tl-title {
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.tl-item p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  max-width: 62ch;
}

.tl-item .tl-src {
  font-size: var(--text-xs);
  margin-top: var(--space-2);
}

/* ============================================================
   Progress dashboard
   ============================================================ */
.progress-wrap {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-6);
  margin-bottom: var(--space-10);
}

.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}

.stat-card .big {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: var(--space-2);
}

.stat-card .cap {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--color-divider);
  background: var(--color-surface);
  padding-block: var(--space-12);
  margin-top: var(--space-20);
}

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-8);
  align-items: start;
}

.footer-grid p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  max-width: 48ch;
}

.footer-note {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-divider);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

/* View switching */
.view {
  display: none;
}
.view.active {
  display: block;
  animation: fade 0.35s ease;
}

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

.disclaimer-banner {
  background: var(--color-warning-highlight);
  border-bottom: 1px solid var(--color-warning);
  font-size: var(--text-xs);
  text-align: center;
  padding: var(--space-2) var(--space-4);
  color: var(--color-text);
}