/* Réglages généraux */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: #f4f4f9;
    color: #222;
    line-height: 1.7;
}

/* Conteneur */
.container {
    width: 90%;
    max-width: 900px;
    margin: 0 auto;
}

/* En-tête */
.site-header {
    background: #4b4bff;
    color: #fff;
    padding: 24px 0;
    margin-bottom: 24px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.15);
}

.logo {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 4px;
}

.tagline {
    opacity: 0.9;
}

/* Section intro */
.intro {
    background: #ffffff;
    padding: 16px 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

/* Résumé (leçon) */
.lesson {
    background: #ffffff;
    padding: 18px 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

.lesson h2 {
    margin-bottom: 8px;
    font-size: 20px;
}

.lesson h3 {
    margin: 14px 0 8px;
    font-size: 16px;
}

.lesson-notes {
    margin-bottom: 10px;
}

/* Bloc de code */
pre {
    background: #111827;
    color: #e5e7eb;
    padding: 12px 14px;
    border-radius: 8px;
    overflow-x: auto;
    font-size: 14px;
    direction: ltr;
    text-align: left;
    line-height: 1.5;
}

code {
    font-family: "Fira Code", "Consolas", monospace;
}

/* Pied de page */
.site-footer {
    text-align: center;
    padding: 16px 0 24px;
    font-size: 14px;
    color: #555;
    margin-top: 10px;
}