:root {
  color-scheme: light;
  --bg: #f6f4ef;
  --surface: #ffffff;
  --surface-soft: #ece9e1;
  --text: #1d1d1b;
  --muted: #68665f;
  --line: #d7d2c7;
  --accent: #2e5046;
  --accent-soft: #dfe9e5;
  --essential-bg: #202a27;
  --essential-text: #f8f7f2;
  --essential-muted: #cbd4d0;
  --shadow: 0 18px 50px rgb(31 37 34 / 10%);
  --reading-width: 1000px;
  --wide-width: 1120px;
  --radius: 18px;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #151716;
  --surface: #1d201f;
  --surface-soft: #242826;
  --text: #f0eee8;
  --muted: #b5b3ac;
  --line: #383d3a;
  --accent: #9fc9bc;
  --accent-soft: #243b34;
  --essential-bg: #e8eee9;
  --essential-text: #17201d;
  --essential-muted: #46554f;
  --shadow: 0 18px 55px rgb(0 0 0 / 30%);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(17px, 1.1vw, 19px);
  line-height: 1.72;
  text-rendering: optimizeLegibility;
  transition: background-color 180ms ease, color 180ms ease;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  text-decoration-thickness: 2px;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

.reading-width {
  width: min(calc(100% - 48px), var(--reading-width));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  padding: 10px max(24px, calc((100vw - var(--wide-width)) / 2));
  border-bottom: 1px solid color-mix(in srgb, var(--line) 70%, transparent);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(14px);
}

.site-title {
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 42px;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  font: 600 0.78rem/1 Inter, ui-sans-serif, system-ui, sans-serif;
  cursor: pointer;
  box-shadow: 0 4px 18px rgb(0 0 0 / 5%);
}

.theme-toggle:hover {
  border-color: var(--accent);
}

.theme-icon {
  font-size: 1rem;
}

.hero {
  display: flex;
  min-height: min(760px, calc(100vh - 68px));
  flex-direction: column;
  justify-content: center;
  padding-block: clamp(70px, 11vw, 150px);
}

.hero h1 {
  max-width: 850px;
  margin: 0 0 42px;
  font-size: clamp(2.6rem, 7vw, 6.5rem);
  font-weight: 500;
  letter-spacing: -0.045em;
  line-height: 0.98;
}

.shortcut-copy {
  max-width: 850px;
  margin: 0 0 12px;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: clamp(1.02rem, 1.8vw, 1.35rem);
  font-weight: 650;
  line-height: 1.5;
}

.shortcut-copy a {
  color: inherit;
}

.shortcut-copy.secondary {
  color: var(--muted);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1rem, 1.55vw, 1.22rem);
  font-weight: 400;
}

.shortcut-link {
  align-self: flex-start;
  margin-top: 34px;
  padding: 10px 0;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
}

.document-section {
  padding-block: clamp(90px, 12vw, 170px);
  border-top: 1px solid var(--line);
}

.section-heading {
  margin-bottom: clamp(52px, 7vw, 88px);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--muted);
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 0.72rem;
  font-weight: 750;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(2.3rem, 5vw, 4.8rem);
  font-weight: 500;
  letter-spacing: -0.04em;
  line-height: 1;
}

.section-intro {
  max-width: 720px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.markdown-content > h1:first-child {
  display: none;
}

.markdown-content h2,
.markdown-content h3,
.markdown-content h4 {
  margin: 2.2em 0 0.65em;
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  line-height: 1.22;
}

.markdown-content h2 {
  font-size: clamp(1.65rem, 2.7vw, 2.45rem);
  letter-spacing: -0.025em;
}

.markdown-content h3 {
  font-size: clamp(1.3rem, 2vw, 1.75rem);
}

.markdown-content p {
  margin: 0 0 1.25em;
}

.markdown-content ul,
.markdown-content ol {
  padding-left: 1.45em;
}

.markdown-content li {
  margin-bottom: 0.55em;
}

.markdown-content blockquote {
  margin: 2.4em 0;
  padding: 0.2em 0 0.2em 1.35em;
  border-left: 3px solid var(--accent);
  color: var(--muted);
  font-size: 1.08em;
}

.markdown-content img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 2.5em auto;
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.markdown-content table {
  display: block;
  width: 100%;
  margin: 2em 0;
  overflow-x: auto;
  border-collapse: collapse;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 0.88rem;
}

.markdown-content th,
.markdown-content td {
  padding: 12px 14px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.markdown-content code {
  padding: 0.15em 0.35em;
  border-radius: 5px;
  background: var(--surface-soft);
  font-size: 0.86em;
}

.phase-menu {
  display: grid;
  gap: 0;
  margin-bottom: clamp(70px, 10vw, 130px);
  border-top: 1px solid var(--line);
}

.phase-menu a {
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: 14px;
  align-items: baseline;
  padding: 22px 4px;
  border-bottom: 1px solid var(--line);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: clamp(1rem, 1.6vw, 1.25rem);
  font-weight: 630;
  text-decoration: none;
}

.phase-menu a:hover {
  color: var(--accent);
}

.phase-menu span {
  color: var(--muted);
  font-size: 0.72em;
  font-variant-numeric: tabular-nums;
}

.phase {
  padding-block: clamp(70px, 10vw, 130px);
  border-top: 1px solid var(--line);
}

.phase:first-child {
  border-top: 0;
}

.back-to-menu {
  display: inline-block;
  margin-top: 30px;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 0.8rem;
  font-weight: 700;
}

.essential-block {
  width: min(calc(100% - 24px), var(--wide-width));
  margin: clamp(90px, 12vw, 170px) auto;
  padding: clamp(58px, 8vw, 105px) clamp(24px, 7vw, 90px);
  border-radius: var(--radius);
  background: var(--essential-bg);
  color: var(--essential-text);
  box-shadow: var(--shadow);
}

.essential-inner {
  max-width: 980px;
  margin-inline: auto;
}

.essential-block .eyebrow {
  color: var(--essential-muted);
}

.essential-block .markdown-content {
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: clamp(1.05rem, 1.5vw, 1.22rem);
  font-weight: 620;
  line-height: 1.67;
}

.essential-block .markdown-content h2,
.essential-block .markdown-content h3,
.essential-block .markdown-content h4,
.essential-block .markdown-content a {
  color: var(--essential-text);
}

.essential-block .markdown-content p {
  margin-bottom: 1.15em;
}

.co-innovation-summary {
  margin-block: clamp(3.25rem, 7vw, 5.5rem);
  padding: clamp(1.8rem, 4vw, 2.8rem) clamp(1rem, 3vw, 2rem);
  border-block: 1px solid color-mix(in srgb, var(--essential-text) 18%, transparent);
  background: color-mix(in srgb, var(--essential-text) 5%, transparent);
}

.co-innovation-summary > :first-child {
  margin-top: 0;
}

.co-innovation-summary > :last-child {
  margin-bottom: 0;
}

.co-innovation-summary > p:first-child {
  font-size: 1.04em;
}

.anchor-target {
  scroll-margin-top: 104px;
}

.essential-block .markdown-content a[href="#preambule-papier-post-it"] {
  text-decoration-color: color-mix(in srgb, var(--essential-text) 62%, transparent);
  text-decoration-thickness: 1.5px;
}

.essential-block .markdown-content a[href="#preambule-papier-post-it"]:hover,
.essential-block .markdown-content a[href="#preambule-papier-post-it"]:focus-visible {
  text-decoration-thickness: 2px;
}

.project-invitation {
  display: inline-block;
  margin-top: 32px;
  color: var(--essential-text);
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 0.86rem;
  font-weight: 760;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding-block: 45px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 0.76rem;
}

.site-footer p {
  margin: 0;
}

.loading,
.load-error {
  color: var(--muted);
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 0.88rem;
}

.load-error {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 10px 14px;
  transform: translateY(-150%);
  border-radius: 6px;
  background: var(--text);
  color: var(--bg);
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
}

.skip-link:focus {
  transform: translateY(0);
}

.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;
}

/* La galerie des thèmes reste en deux colonnes sur ordinateur. */
.markdown-content div[style*="grid-template-columns:repeat(auto-fit,minmax(280px,1fr))"] {
  grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
}

@media (max-width: 700px) {
  .reading-width {
    width: min(calc(100% - 32px), var(--reading-width));
  }

  .site-header {
    padding-inline: 16px;
  }

  .theme-label {
    display: none;
  }

  .hero {
    min-height: auto;
    padding-block: 90px 110px;
  }

  .hero h1 {
    margin-bottom: 34px;
  }

  .phase-menu a {
    grid-template-columns: 40px 1fr;
    padding-block: 18px;
  }

  .essential-block {
    width: calc(100% - 16px);
    border-radius: 12px;
  }

  .co-innovation-summary {
    margin-block: 2.75rem;
    padding: 1.5rem 1rem;
  }

  .markdown-content div[style*="grid-template-columns:repeat(auto-fit,minmax(280px,1fr))"] {
    grid-template-columns: minmax(0, 1fr) !important;
  }

  .site-footer {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}