/*
 * Palette jour / nuit — crème, ardoise et camaïeux de bleu
 * Activation du mode nuit : <html data-theme="dark">
 */

@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500&family=IBM+Plex+Sans:wght@400;500;600;700&family=Inter:wght@400;500;600;700;800&display=swap");

:root {
  color-scheme: light;

  /* Couleurs — mode jour */
  --color-background: #F7F3E8;
  --color-surface: #FBF9F3;
  --color-text: #263238;
  --color-text-muted: #526168;
  --color-link: #315F9B;
  --color-link-hover: #244779;
  --color-link-visited: #66528E;
  --color-accent: #416EA8;
  --color-on-accent: #FFFFFF;
  --color-border: rgba(38, 50, 56, 0.16);
  --color-focus: #315F9B;

  /* Typographie */
  --font-heading: "Inter", Arial, sans-serif;
  --font-body: "IBM Plex Sans", Arial, sans-serif;
  --font-data: "IBM Plex Mono", monospace;

  /* Mise en page */
  --content-width: 72rem;
  --radius-small: 3px;
  --radius-medium: 8px;
}

/* Mode nuit : on peut aussi utiliser .theme-dark ou .night sur un conteneur. */
[data-theme="dark"],
.theme-dark,
.night {
  color-scheme: dark;

  --color-background: #263238;
  --color-surface: #303D43;
  --color-text: #F4F1E8;
  --color-text-muted: #C0C9C9;
  --color-link: #8CB8F0;
  --color-link-hover: #B2D1FF;
  --color-link-visited: #CEBEF4;
  --color-accent: #315F9B;
  --color-on-accent: #263238;
  --color-border: rgba(244, 241, 232, 0.17);
  --color-focus: #B2D1FF;
}

html {
  background: var(--color-background);
  color: var(--color-text);
  font-family: var(--font-body);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-background);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--color-text);
  font-family: var(--font-heading);
  line-height: 1.15;
  letter-spacing: -0.035em;
}

a {
  color: var(--color-link);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.16em;
  transition: color 150ms ease, text-decoration-thickness 150ms ease;
}

a:visited {
  color: var(--color-link-visited);
}

a:hover,
a:focus-visible {
  color: var(--color-link-hover);
  text-decoration-thickness: 2px;
}

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

::selection {
  background: var(--color-accent);
  color: var(--color-on-accent);
}

button,
input,
select,
textarea {
  color: var(--color-text);
  font: inherit;
}

button,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  min-height: 2.75rem;
  padding: 0.65em 1em;
  border: 1px solid var(--color-link);
  border-radius: var(--radius-small);
  background: var(--color-link);
  color: var(--color-on-accent);
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
}

button:hover,
.button:hover {
  border-color: var(--color-link-hover);
  background: var(--color-link-hover);
  color: #FFFFFF;
}

.button--secondary {
  background: transparent;
  color: var(--color-link);
}

.button--secondary:hover {
  background: var(--color-surface);
  color: var(--color-link-hover);
}

a.button:visited {
  color: var(--color-on-accent);
}

hr,
.divider {
  border: 0;
  border-top: 1px solid var(--color-border);
}

.text-muted {
  color: var(--color-text-muted);
}

.text-data,
.data,
code,
kbd,
samp {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
}

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