/* =====================================================
   ====================== Reset =========================
   ===================================================== */
* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;

  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto,
    "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/*
 * Structure verticale commune aux thèmes clair et obscur.
 * Le contenu principal absorbe l'espace disponible entre
 * l'en-tête et le pied de page.
 */
.site-main {
  flex: 1 0 auto;
  width: 100%;
  display: flex;
  flex-direction: column;
}

/* =====================================================
   ====================== Utils =========================
   ===================================================== */
.centered {
  text-align: center;
}

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

/* =====================================================
   ====================== Header ========================
   ===================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  background: rgba(255, 255, 255, 0.75);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(6px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-mark {
  font-size: 1.25rem;
}

.brand-text {
  font-weight: 700;
  letter-spacing: 0.2px;
}

.hamburger {
  font-size: 1.4rem;
  padding: 8px 14px;
  margin-right: 0;
}

.site-nav {
  margin-left: auto;
}

.site-nav ul {
  display: flex;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  appearance: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px 14px;
  border-radius: 999px;
  font-weight: 600;
  color: var(--muted);
  position: relative;
  transition: color 0.2s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 4px;
  height: 2px;
  background: linear-gradient(90deg, var(--turq-a), var(--turq-b));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
  border-radius: 2px;
}

.nav-link:hover {
  color: var(--text);
}

.nav-link:hover::after {
  transform: scaleX(1);
}