/* ============================================================
   Base — reset minimal, typographie, layout, header, footer
   ============================================================ */

/* ---------- Polices auto-hébergées ---------- */
@font-face {
  font-family: 'Fraunces';
  src: url('../fonts/Fraunces-VariableFont.woff2') format('woff2-variations');
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Inter';
  src: url('../fonts/Inter-VariableFont.woff2') format('woff2-variations');
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'JetBrains Mono';
  src: url('../fonts/JetBrainsMono-VariableFont.woff2') format('woff2-variations');
  font-weight: 100 800;
  font-style: normal;
  font-display: swap;
}

/* ---------- Reset minimal ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
img, svg, picture { max-width: 100%; display: block; height: auto; }
button { font: inherit; cursor: pointer; }
ul, ol { padding: 0; }

/* ---------- Body ---------- */
body {
  font-family: var(--f-sans);
  font-size: var(--t-16);
  line-height: 1.65;
  color: var(--c-text);
  background: var(--c-bg);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background var(--tr-mid), color var(--tr-mid);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---------- Typographie ---------- */
h1, h2, h3, h4 {
  font-family: var(--f-serif);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--c-text);
  font-variation-settings: "opsz" 36;
}
h1 { font-size: var(--t-48); font-variation-settings: "opsz" 96; }
h2 { font-size: var(--t-32); font-variation-settings: "opsz" 48; }
h3 { font-size: var(--t-25); font-variation-settings: "opsz" 24; }
h4 { font-size: var(--t-20); }

p { line-height: 1.7; }
p + p { margin-top: var(--s-4); }

strong { font-weight: 600; color: var(--c-text); }
em { font-style: italic; }

a {
  color: var(--c-accent);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
  transition: color var(--tr-fast);
}
a:hover { color: var(--c-accent-hover); }
a:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

code, .mono {
  font-family: var(--f-mono);
  font-size: 0.92em;
  background: var(--c-code-bg);
  padding: 0.1em 0.35em;
  border-radius: var(--r-sm);
  color: var(--c-text);
}

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

/* ---------- Layout ---------- */
.page {
  width: 100%;
  max-width: var(--w-page);
  margin: 0 auto;
  padding-left: var(--s-6);
  padding-right: var(--s-6);
}
.prose { max-width: var(--w-prose); }
main { flex: 1; }

/* Skip link (a11y) */
.skip-link {
  position: absolute;
  top: -40px;
  left: var(--s-4);
  background: var(--c-accent);
  color: var(--c-bg);
  padding: var(--s-2) var(--s-4);
  text-decoration: none;
  border-radius: var(--r-sm);
  z-index: 100;
}
.skip-link:focus { top: var(--s-4); }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  background: color-mix(in srgb, var(--c-bg) 92%, transparent);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: var(--b-1) solid var(--c-border);
  z-index: 50;
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-6);
  padding: var(--s-3) var(--s-6);
  max-width: var(--w-page);
  margin: 0 auto;
}
.brand {
  font-family: var(--f-serif);
  font-weight: 700;
  font-size: var(--t-20);
  color: var(--c-text);
  text-decoration: none;
  letter-spacing: -0.01em;
  font-variation-settings: "opsz" 24;
}
.brand:hover { color: var(--c-accent); }

.nav {
  display: flex;
  align-items: center;
  gap: var(--s-6);
  list-style: none;
  margin: 0;
}
.nav a {
  color: var(--c-text-muted);
  text-decoration: none;
  font-size: var(--t-14);
  font-weight: 500;
  padding: var(--s-2) 0;
  position: relative;
}
.nav a:hover { color: var(--c-accent); }
.nav a[aria-current="page"] {
  color: var(--c-accent);
}
.nav a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: var(--c-accent);
  border-radius: 1px;
}

/* ---------- Bouton bascule thème ---------- */
.theme-toggle {
  background: transparent;
  border: var(--b-1) solid var(--c-border);
  border-radius: var(--r-sm);
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--c-text-muted);
  transition: border-color var(--tr-fast), color var(--tr-fast), background var(--tr-fast);
}
.theme-toggle:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
  background: var(--c-bg-card);
}
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-sun  { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="dark"] .theme-toggle .icon-sun  { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: var(--b-1) solid var(--c-border);
  margin-top: var(--s-24);
  padding: var(--s-8) 0;
  background: var(--c-bg-card);
}
.site-footer__inner {
  max-width: var(--w-page);
  margin: 0 auto;
  padding: 0 var(--s-6);
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-6);
  justify-content: space-between;
  align-items: center;
  color: var(--c-text-muted);
  font-size: var(--t-14);
}
.site-footer__links {
  display: flex;
  gap: var(--s-6);
  flex-wrap: wrap;
  list-style: none;
}
.site-footer__links a {
  color: var(--c-text-muted);
  text-decoration: none;
}
.site-footer__links a:hover { color: var(--c-accent); }
.site-footer__copyright {
  font-size: var(--t-12);
}

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  :root {
    --t-48: 2.25rem;
    --t-32: 1.625rem;
    --t-25: 1.375rem;
  }
  .site-header__inner { padding: var(--s-3) var(--s-4); }
  .page { padding-left: var(--s-4); padding-right: var(--s-4); }
  .nav { gap: var(--s-4); }
  .site-footer__inner { justify-content: center; text-align: center; }
}

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