/* ========================================================================== 
   Base — reset, typographie, comportements globaux
   ========================================================================== */

*, *::before, *::after { box-sizing: border-box; }

html { color-scheme: dark; scroll-behavior: smooth; }
[data-theme="light"] { color-scheme: light; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  font-weight: 400;
  color: var(--text-primary);
  background:
    radial-gradient(circle at 15% -10%, var(--accent-soft), transparent 30rem),
    radial-gradient(circle at 95% 0%, var(--info-soft), transparent 28rem),
    var(--bg-primary);
  transition: background-color var(--transition-normal), color var(--transition-normal);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: .26;
  background-image: linear-gradient(var(--border) 1px, transparent 1px), linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: linear-gradient(to bottom, black, transparent 42rem);
  z-index: -1;
}

h1, h2, h3, h4 {
  margin: 0;
  font-weight: 750;
  line-height: 1.18;
  letter-spacing: -0.025em;
  color: var(--text-primary);
}

h1 { font-size: clamp(2rem, 5vw, 3.25rem); }
h2 { font-size: clamp(1.45rem, 3vw, 2rem); }
h3 { font-size: 1.15rem; }
h4 { font-size: 1rem; }

p { margin: 0 0 var(--space-4); color: var(--text-secondary); max-width: 68ch; }
a { color: var(--accent-hover); text-decoration: none; }
a:hover { color: var(--accent-hover); }
ul, ol { margin: 0; padding: 0; }
button, input, select, textarea { font: inherit; }
button { color: inherit; }
img, svg { max-width: 100%; display: block; }

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

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 80%, white 20%);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

#view-root { padding-bottom: var(--space-16); }

.app-container { width: min(100% - 2.25rem, var(--content-width)); margin-inline: auto; }
.quiz-container { width: min(100% - 2.25rem, var(--quiz-width)); margin-inline: auto; }

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

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -100px;
  background: var(--accent);
  color: #fff;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  z-index: 1000;
  box-shadow: var(--shadow-md);
  transition: top var(--transition-fast);
}
.skip-link:focus { top: var(--space-4); }

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