:root {

    --bg-color: #fef9f3;
    --text-color: #4a2a1c;
    --header-bg: linear-gradient(135deg, #3e0112 0%, #600824 100%);
    --header-text: #fffaf0;
    --sidebar-bg: #f5ede4;
    --sidebar-hover: #e8d9c9;
    --card-bg: #ffffff;
    --card-border: #e8d9c9;
    --code-bg:#efd4dc;
    --code-text: #000000;
    --button-bg: #600824;
    --button-hover: #8a0d36;
    --button-text: #ffffff;
    --exercise-bg: #fcf8f2;
    --exercise-border: #e8d9c9;
    --tab-bg: #f5ede4;
    --tab-active: #600824;
    --tab-text: #593425;
   
    --fun-yellow: #ebbebe;
    --fun-green: #370229;
    --fun-blue: #9C27B0;
    --fun-purple: #43084d;
    --fun-pink: #E91E63;
    
    /* Ombres douces */
    --shadow-sm: 0 2px 8px rgba(94, 28, 54, 0.08);
    --shadow-md: 0 4px 12px rgba(94, 28, 54, 0.12);
    --shadow-lg: 0 8px 24px rgba(94, 28, 54, 0.16);
    
    /* Bordures arrondies plus prononcées pour un aspect ludique */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 30px;
    
    /* Espacements généreux */
    --space-xs: 0.75rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-xxl: 4rem;
}
.dark-mode {
  /* ---------- FOND & TEXTE ---------- */
  --bg-color: #0a0a0a; /* au lieu de #000000 */
    --card-bg: #1a1a1a;  /* au lieu de #000000 */
    
   
    --fun-yellow: rgba(231, 158, 207, 0.8);
  --text-color: #ffffff;
  --header-bg: #000000;
  --header-text: #c897c1;
  --sidebar-bg: #21041b;
  --sidebar-hover: #111111;
  --card-border: #333333;
  --code-bg: #0a0a0a;
  --code-text: #b2d9d9;
  --button-bg: #b41faa;
  --button-hover: #21041b;
  --button-text: #000000;
  --exercise-bg: #000000;
  --exercise-border: #333333;
  --tab-bg: #000000;
  --tab-active: #f5aef5;
  --tab-text: #ffffff;

  /* ---------- ACCENTS NÉON ---------- */
  --fun-yellow: #e79ecf;
  --fun-green: #d778de;
  --fun-blue: #00ffff;
  --fun-purple: #ff00ff;
  --fun-pink: #ff1493;

  /* ---------- OMBRES NÉON ---------- */
  --shadow-sm: 0 0 4px var(--fun-green);
  --shadow-md: 0 0 8px var(--fun-blue);
  --shadow-lg: 0 0 16px var(--fun-purple);
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Comic Neue', 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.7;
    font-size: 16px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-image: radial-gradient(circle at 15% 50%, rgba(96, 8, 36, 0.05) 0%, transparent 20%),
                      radial-gradient(circle at 85% 30%, rgba(255, 179, 71, 0.05) 0%, transparent 20%);
}

/* ===== HEADER LUDIQUE ===== */
header {
    background: var(--header-bg);
    color: var(--header-text);
    height: 1.5cm;
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    padding: 0 var(--space-md);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    border-bottom: 3px solid var(--fun-yellow);
}


/* Page des téléchargements PDF */
.pdf-downloads {
    max-width: 1200px;
    margin: 0 auto;
}

.pdf-intro {
    background: linear-gradient(135deg, #8a0d36 0%, #764ba2 100%);
    color: white;
    padding: 25px;
    border-radius: 15px;
    margin: 20px 0 40px 0;
}

.pdf-intro ul {
    margin: 15px 0 0 20px;
}

.pdf-intro li {
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.pdf-intro li:before {
    font-size: 20px;
}

.pdf-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
    margin: 30px 0;
}

.pdf-card {
    background: white;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    border: 1px solid #e0e0e0;
}

.pdf-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}

.pdf-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    border-bottom: 2px solid #4a6fa5;
    padding-bottom: 10px;
}

.pdf-card-header h3 {
    margin: 0;
    color: #310915;
    font-size: 24px;
}

.pdf-badge {
    background: #8a0d36;
    color: white;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: bold;
}

.pdf-description {
    color: #666;
    margin: 0 0 20px 0;
    font-size: 15px;
    line-height: 1.5;
}

.pdf-links {
    margin-top: 20px;
}

.pdf-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    background:  #8a0d36;
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: bold;
    transition: all 0.3s;
    border: 2px solid transparent;
}

.pdf-link:hover {
    background:  #961c45;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.pdf-icon {
    font-size: 20px;
}




/* Mode sombre */
.dark-mode .pdf-intro {
    background: linear-gradient(135deg, #4a6fa5 0%, #3a5a80 100%);
}

.dark-mode .pdf-card {
    background: #2d2d2d;
    border-color: #444;
}

.dark-mode .pdf-card-header h3 {
    color: #7ba4e0;
}

.dark-mode .pdf-description {
    color: #aaa;
}

.dark-mode .pdf-link {
    background: #3a5a80;
}

.dark-mode .pdf-link:hover {
    background: #2a4a70;
}

.dark-mode .pdf-instructions {
    background: #2d2d2d;
    border-color: #3a5a80;
}

.dark-mode .pdf-note {
    background: #332701;
    border-color: #665003;
    color: #ffd54f;
}

.dark-mode .pdf-note code {
    background: #3a3a3a;
    color: #ffd54f;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--header-text);
    letter-spacing: -0.5px;
    text-shadow: 2px 2px 0 rgba(0, 0, 0, 0.2);
    position: relative;
    display: inline-block;
}


@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

.theme-toggle {
    background: rgba(30, 18, 1, 0.2);
    border: 2px solid var(--fun-yellow);
    color: var(--header-text);
    cursor: pointer;
    font-size: 1.3rem;
    padding: var(--space-sm);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(255, 179, 71, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(255, 179, 71, 0); }
    100% { box-shadow: 0 0 0 0 rgba(255, 179, 71, 0); }
}

.theme-toggle:hover {
    background: rgba(255, 179, 71, 0.3);
    transform: rotate(360deg) scale(1.1);
}

.container {
    display: flex;
    flex: 1;
    min-height: calc(100vh - 140px);
}

/* ===== MENU LUDIQUE ===== */
.sidebar {
    width: 240px;
    background: var(--sidebar-bg);
    padding: var(--space-lg) 0;
    overflow-y: auto;
    position: sticky;
    top: 55px;
    height: calc(100vh - 80px);
    border-right: 2px solid var(--fun-yellow);
    flex-shrink: 0;
    box-shadow: 3px 0 10px rgba(0, 0, 0, 0.1);
}

.sidebar h3 {
    padding: 0 var(--space-md) var(--space-sm);
    color: var(--button-bg);
    margin-bottom: var(--space-md);
    font-size: 0.90rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: relative;
    display: flex;
    align-items: center;
    gap: 8px;
}


.sidebar ul {
    list-style: none;
    padding: 0;
}

.sidebar li {
    margin-bottom: 4px;
    position: relative;
    transform-origin: left center;
}

.sidebar a {
    display: flex;
    align-items: center;
    padding: 0.9rem var(--space-md);
    color: var(--text-color);
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
    margin-right: var(--space-sm);
    position: relative;
    min-height: 44px;
    border-left: 4px solid transparent;
}

.sidebar a::before {
    content: '→';
    opacity: 0;
    transform: translateX(-10px);
    transition: all 0.3s ease;
    margin-right: 8px;
    color: var(--fun-yellow);
}

.sidebar a:hover {
    color: var(--button-bg);
    padding-left: calc(var(--space-md) + 15px);
    background: linear-gradient(90deg, 
        color-mix(in srgb, var(--button-bg) 15%, transparent) 0%,
        color-mix(in srgb, var(--button-bg) 5%, transparent) 100%);
    transform: translateX(5px);
    border-left-color: var(--fun-yellow);
    padding-left: 25px;
}

.sidebar a:hover::before {
    opacity: 1;
    transform: translateX(0);
}

/* État actif avec badge */
.sidebar a.active {
    color: var(--button-bg);
    font-weight: 700;
    background: linear-gradient(90deg, 
        color-mix(in srgb, var(--button-bg) 20%, transparent) 0%,
        color-mix(in srgb, var(--button-bg) 10%, transparent) 100%);
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
    padding-left: calc(var(--space-md) + 15px);
    border-left-color: var(--button-bg);
    box-shadow: 3px 0 10px rgba(96, 8, 36, 0.2);
    position: relative;
}



@keyframes sparkle {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.2); }
}

/* Animation d'entrée ludique */
@keyframes slideInBounce {
    0% {
        opacity: 0;
        transform: translateX(-20px) scale(0.9);
    }
    70% {
        transform: translateX(5px) scale(1.05);
    }
    100% {
        opacity: 1;
        transform: translateX(0) scale(1);
    }
}

.sidebar li {
    animation: slideInBounce 0.5s ease-out forwards;
    animation-delay: calc(var(--index, 0) * 0.05s);
}

/* ===== CONTENU PRINCIPAL LUDIQUE ===== */
.main-content {
    flex: 1;
    padding: var(--space-xxl);
    overflow-y: auto;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.main-content > * {
    margin-bottom: var(--space-xl);
}

/* ===== TITRES LUDIQUES ===== */
.chapter-title {
    color: var(--text-color);
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-md);
    position: relative;
    line-height: 1.2;
    background: linear-gradient(135deg, var(--button-bg), var(--fun-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

.chapter-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100px;
    height: 6px;
    background: linear-gradient(90deg, var(--button-bg), var(--fun-yellow));
    border-radius: 3px;
    animation: titleUnderline 2s ease-in-out infinite alternate;
}

@keyframes titleUnderline {
    0% { width: 100px; }
    100% { width: 200px; }
}

/* ===== CARTES ÉDUCATIVES LUDIQUES ===== */
.welcome-message,
.summary,
.example,
.exercise,
.installation,
.theory {
    background: var(--card-bg);
    border: 3px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    margin-bottom: var(--space-xl);
    box-shadow: var(--shadow-md);
    transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    position: relative;
    overflow: hidden;
}

.welcome-message::before,
.summary::before,
.example::before,
.exercise::before,
.installation::before,
.theory::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(90deg, var(--fun-yellow), var(--fun-blue), var(--fun-green));
    animation: rainbowBorder 3s linear infinite;
}

@keyframes rainbowBorder {
    0% { background-position: 0% 50%; }
    100% { background-position: 100% 50%; }
}

.welcome-message:hover,
.summary:hover,
.example:hover,
.exercise:hover,
.installation:hover,
.theory:hover {
    transform: translateY(-5px) rotate(1deg);
    box-shadow: var(--shadow-lg);
}

.welcome-message {
    background: linear-gradient(135deg, var(--card-bg) 0%, color-mix(in srgb, var(--card-bg) 95%, var(--button-bg)) 100%);
    border: none;
    border-radius: var(--radius-xl);
}

.welcome-message h1 {
    color: var(--text-color);
    font-size: 2.2rem;
    margin-bottom: var(--space-lg);
    text-align: center;
    font-weight: 800;
    position: relative;
    display: inline-block;
}

.summary {
    border-style: none; }

@keyframes wave {
    0%, 100% { transform: rotate(0deg); }
    25% { transform: rotate(15deg); }
    75% { transform: rotate(-15deg); }
}

.welcome-content {
    max-width: 800px;
    margin: 0 auto;
}

.welcome-content p {
    margin-bottom: var(--space-md);
    font-size: 1.1rem;
    line-height: 1.8;
    position: relative;
    padding-left: 30px;
}



.recommendation {
    background: linear-gradient(135deg, color-mix(in srgb, var(--fun-green) 20%, transparent), color-mix(in srgb, var(--fun-blue) 20%, transparent));
    border-left: 6px solid var(--fun-green);
    padding: var(--space-lg);
    margin-top: var(--space-xl);
    border-radius: var(--radius-md);
    font-style: italic;
    font-size: 1.1rem;
    position: relative;
    overflow: hidden;
}



/* ===== ONGLETS LUDIQUES ===== */
.installation-tabs {
    display: flex;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
    padding: var(--space-sm);
    background: var(--tab-bg);
    border-radius: var(--radius-lg);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.installation-tab {
    padding: var(--space-sm) var(--space-md);
    background: white;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 600;
    color: var(--tab-text);
    transition: all 0.3s ease;
    font-size: 0.9rem;
    position: relative;
    flex: 1;
    text-align: center;
}

.installation-tab::before {
    content: '';
    position: absolute;
    top: 5px;
    left: 5px;
    right: 5px;
    bottom: 5px;
    border-radius: calc(var(--radius-md) - 4px);
    background: linear-gradient(135deg, transparent, rgba(255, 255, 255, 0.3));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.installation-tab:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.installation-tab:hover::before {
    opacity: 1;
}

.installation-tab[data-os="linux"]:hover {
    border-color: var(--fun-green);
    color: var(--fun-green);
}

.installation-tab[data-os="windows"]:hover {
    border-color: var(--fun-blue);
    color: var(--fun-blue);
}

.installation-tab[data-os="mac"]:hover {
    border-color: var(--fun-purple);
    color: var(--fun-purple);
}

.installation-tab.active {
    background: var(--tab-active);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(96, 8, 36, 0.2);
    border-color: var(--fun-yellow);
}

.installation-tab.active::after {
    content: '✓';
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.2rem;
}

.installation-content {
    display: none;
    animation: slideUp 0.5s ease;
}

.installation-content.active {
    display: block;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== BLOCS DE CODE LUDIQUES ===== */
pre {
    background: var(--code-bg);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    margin: var(--space-md) 0;
    border-left: 6px solid var(--fun-yellow);
    position: relative;
    overflow-x: auto;
    box-shadow: var(--shadow-md);
   
}

pre::before {
    content: 'OCaml';
    position: absolute;
    top: 6px;
    left: 20px;
    color:rgb(0, 0, 0);
    padding: 4px 16px;
    font-size: 0.6rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

pre:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-lg);
}

code {
    background: color-mix(in srgb, var(--code-bg) 90%, transparent);
    color: var(--code-text);
    padding: 0.3em 0.6em;
    border-radius: var(--radius-sm);
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 0.95em;
    
    transition: all 0.3s ease;
}

code:hover {
    background: color-mix(in srgb, var(--code-bg) 95%, var(--fun-yellow));
    transform: scale(1.05);
}

/* ===== EXERCICES LUDIQUES ===== */
.exercise-item {
    background: var(--exercise-bg);
    border: 3px solid var(--exercise-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
      margin-bottom: 30px;
    transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    position: relative;
    overflow: hidden;
}


.exercise-item:hover {
    border-color: var(--button-bg);
    transform: translateX(10px) scale(1.02);
    box-shadow: var(--shadow-lg);
}

.exercise-item:hover::before {
    opacity: 0.3;
    transform: scale(1.2);
}

.exercise-difficulty {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    border-radius: 25px;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    margin-bottom: var(--space-sm);
    position: relative;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.easy {
    background: linear-gradient(135deg, var(--fun-green), #2e7d32);
    color: white;
}

.medium {
    background: linear-gradient(135deg, var(--fun-yellow), #ed6c02);
    color: white;
}

.hard {
    background: linear-gradient(135deg, #E91E63, #c62828);
    color: white;
}

.exercise-difficulty::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transform: rotate(45deg);
    animation: shine 3s infinite;
}

@keyframes shine {
    0% { transform: translateX(-100%) translateY(-100%) rotate(45deg); }
    100% { transform: translateX(100%) translateY(100%) rotate(45deg); }
}

.solution-toggle {
    background: linear-gradient(135deg, var(--button-bg), var(--fun-purple));
    color: var(--button-text);
    border: none;
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-lg);
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 700;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 8px rgba(96, 8, 36, 0.2);
}


.solution-toggle:hover {
    background: linear-gradient(135deg, var(--button-hover), #BA68C8);
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 6px 12px rgba(96, 8, 36, 0.3);
}

.solution-content {
    display: none;
    margin-top: var(--space-md);
    animation: slideDownBounce 0.5s ease;
}

.solution-content.show {
    display: block;
}

@keyframes slideDownBounce {
    0% {
        opacity: 0;
        transform: translateY(-20px) scale(0.95);
    }
    70% {
        transform: translateY(5px) scale(1.02);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}
/* ---------- CODE DANS LES TABLEAUX ---------- */
table code {
    white-space: pre-wrap;        
    word-break: break-all;        
    display: inline-block;       
    max-width: 100%;             
    font-size: 0.9em;             
}

/* ===== TABLEAUX LUDIQUES ===== */
table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: var(--space-lg) 0;
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 2px solid var(--card-border);
}

th, td {
    padding: var(--space-md);
    text-align: left;
    border-bottom: 2px solid var(--card-border);
}

th {
    background: rgba(39, 2, 2, 0.905);
    color: white;
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
    position: relative;
}

th::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--fun-yellow);
}

tr:hover {
    background: color-mix(in srgb, var(--sidebar-hover) 30%, transparent);
    transform: translateX(5px);
    transition: all 0.3s ease;
}

/* ===== FOOTER LUDIQUE ===== */
footer {
    background: var(--header-bg);
    color: var(--header-text);
    padding: var(--space-sm);
    margin-top: auto;
    border-top: 3px solid var(--fun-yellow);
    min-height: 10mm;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}




@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

footer p {
    font-size: 0.9rem;
    margin: 0;
    padding: 0;
    opacity: 0.9;
    font-weight: 600;
    text-align: center;
}

/* ===== ÉLÉMENTS SPÉCIAUX LUDIQUES ===== */
.note {
    background: linear-gradient(135deg, color-mix(in srgb, var(--fun-blue) 15%, transparent), color-mix(in srgb, var(--fun-blue) 5%, transparent));
    border-left: 6px solid var(--fun-blue);
    padding: var(--space-lg);
    margin: var(--space-lg) 0;
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
    position: relative;
}

.note::before {
    content: '📝 Note';
    display: block;
    font-weight: 700;
    color: var(--fun-blue);
    margin-bottom: var(--space-sm);
    font-size: 1.1rem;
}

.culture {
    background: linear-gradient(135deg, color-mix(in srgb, var(--fun-yellow) 15%, transparent), color-mix(in srgb, var(--fun-yellow) 5%, transparent));
    border-left: 6px solid var(--fun-yellow);
    padding: var(--space-lg);
    margin: var(--space-lg) 0;
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
    position: relative;
}


.error-example {
    background: linear-gradient(135deg, color-mix(in srgb, #E91E63 15%, transparent), color-mix(in srgb, #E91E63 5%, transparent));
    border-left: 6px solid #E91E63;
    padding: var(--space-lg);
    margin: var(--space-lg) 0;
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
    position: relative;
}

.error-example::before {
    content: '⚠️ Attention';
    display: block;
    font-weight: 700;
    color: #E91E63;
    margin-bottom: var(--space-sm);
    font-size: 1.1rem;
}

/* ===== BADGES ET INDICATEURS ===== */
.badge {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-left: var(--space-xs);
}

.badge-new {
    background: var(--fun-green);
    color: white;
    animation: pulse 2s infinite;
}

.badge-popular {
    background: var(--fun-yellow);
    color: var(--text-color);
}

.badge-challenge {
    background: var(--fun-pink);
    color: white;
}

/* ===== PROGRESS BAR LUDIQUE ===== */
.progress-container {
    background: var(--card-border);
    border-radius: var(--radius-xl);
    height: 10px;
    margin: var(--space-lg) 0;
    overflow: hidden;
    position: relative;
}

.progress-bar {
    background: linear-gradient(90deg, var(--fun-green), var(--fun-blue), var(--fun-purple));
    height: 100%;
    border-radius: var(--radius-xl);
    width: 0%;
    animation: progressFill 2s ease-out forwards;
    position: relative;
    overflow: hidden;
}

.progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes progressFill {
    from { width: 0%; }
    to { width: var(--progress-width, 70%); }
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        height: auto;
        position: static;
        border-right: none;
        border-bottom: 3px solid var(--fun-yellow);
        padding: var(--space-md) 0;
    }
    
    .sidebar ul {
        display: flex;
        overflow-x: auto;
        padding: 0 var(--space-lg);
        gap: var(--space-xs);
        scrollbar-width: thin;
    }
    
    .sidebar li {
        margin-bottom: 0;
        flex-shrink: 0;
        animation: none;
    }
    
    .sidebar a {
        border-left: none;
        border-bottom: 3px solid transparent;
        padding: var(--space-sm);
        white-space: nowrap;
        border-radius: var(--radius-md);
    }
    
    .sidebar a:hover,
    .sidebar a.active {
        padding-left: var(--space-sm);
        border-bottom-color: var(--button-bg);
        transform: translateY(-2px);
    }
    
    .sidebar a::before {
        display: none;
    }
    
    .main-content {
        padding: var(--space-xl);
    }
}

@media (max-width: 768px) {
    .chapter-title {
        font-size: 2rem;
    }
    
    .welcome-message h1 {
        font-size: 1.8rem;
    }
    
    .installation-tabs {
        flex-direction: column;
    }
    
    .installation-tab {
        margin-bottom: var(--space-xs);
    }
}

@media (max-width: 480px) {
    :root {
        --space-xs: 0.5rem;
        --space-sm: 0.75rem;
        --space-md: 1rem;
        --space-lg: 1.25rem;
        --space-xl: 1.5rem;
        --space-xxl: 2rem;
    }
    
    header {
        padding: var(--space-sm);
    }
    
    .logo {
        font-size: 1.5rem;
    }
    
    .theme-toggle {
        width: 44px;
        height: 44px;
    }
    
    .chapter-title {
        font-size: 1.75rem;
    }
     .chapter-title { font-size: 1.5rem; }
    .main-content { padding: var(--space-md); }
}
@media (prefers-reduced-motion: reduce) {
    * { animation-duration: 0.01ms !important; }
}

/* Focus states pour navigation clavier */
a:focus, button:focus {
    outline: 3px solid var(--fun-yellow);
    outline-offset: 2px;
}
/* ===== SCROLLBAR LUDIQUE ===== */
::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}

::-webkit-scrollbar-track {
    background: var(--sidebar-bg);
    border-radius: var(--radius-sm);
    border: 2px solid var(--card-border);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, var(--button-bg), var(--fun-yellow));
    border-radius: var(--radius-sm);
    border: 2px solid var(--sidebar-bg);
    box-shadow: inset 0 0 4px rgba(0, 0, 0, 0.2);
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, var(--button-hover), #ffcc80);
    transform: scale(1.1);
}

/* ===== DARK MODE ADAPTATIONS ===== */

.dark-mode header {
  border-bottom: 2px solid var(--fun-green);
  box-shadow: 0 0 12px var(--fun-green);
}

.dark-mode .sidebar a.active {
  border-left-color: var(--fun-green);
  text-shadow: 0 0 4px var(--fun-green);
}
.dark-mode .installation-tab{
  border-color: var(--fun-green);
  color: black; }


.dark-mode .installation-tab.active {
  box-shadow: 0 0 8px var(--fun-green);
  color: black;
}


.dark-mode .exercise-difficulty {
  text-shadow: 0 0 3px currentColor;
}

.dark-mode th {
  background: #000;
  border-bottom: 2px solid var(--fun-green);
  text-shadow: 0 0 4px var(--fun-green);
}
.dark-mode pre::before {
    content: 'OCaml';
    position: absolute;
    top: 6px;
    left: 20px;
    color:beige;
    padding: 4px 16px;
    font-size: 0.6rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.dark-mode tr:hover {
  background: #111;
  box-shadow: inset 0 0 4px var(--fun-purple);
}
/* ===== ANIMATIONS GLOBALES ===== */
@keyframes floatIn {
    0% {
        opacity: 0;
        transform: translateY(30px) scale(0.9);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.main-content > * {
    animation: floatIn 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55) forwards;
    opacity: 0;
}

.main-content > *:nth-child(1) { animation-delay: 0.1s; }
.main-content > *:nth-child(2) { animation-delay: 0.2s; }
.main-content > *:nth-child(3) { animation-delay: 0.3s; }
.main-content > *:nth-child(4) { animation-delay: 0.4s; }
.main-content > *:nth-child(5) { animation-delay: 0.5s; }

/* ===== EFFETS DE CONFETTI (pour les succès) ===== */
.confetti {
    position: fixed;
    width: 10px;
    height: 10px;
    background: var(--fun-yellow);
    border-radius: 50%;
    animation: confettiFall 5s linear forwards;
    z-index: 10000;
}

@keyframes confettiFall {
    0% {
        transform: translateY(-100vh) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: translateY(100vh) rotate(720deg);
        opacity: 0;
    }
}

/* ===== LOADER LUDIQUE ===== */
.loader {
    width: 60px;
    height: 60px;
    border: 6px solid var(--card-border);
    border-top: 6px solid var(--button-bg);
    border-right: 6px solid var(--fun-yellow);
    border-bottom: 6px solid var(--fun-green);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: var(--space-xl) auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ===== TOOLTIPS LUDIQUES ===== */
.tooltip {
    position: relative;
    display: inline-block;
    cursor: help;
    border-bottom: 2px dotted var(--fun-yellow);
}

.tooltip .tooltiptext {
    visibility: hidden;
    width: 200px;
    background: var(--card-bg);
    color: var(--text-color);
    text-align: center;
    border-radius: var(--radius-md);
    padding: var(--space-sm);
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    transition: all 0.3s ease;
    border: 2px solid var(--fun-yellow);
    box-shadow: var(--shadow-lg);
}

.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
    transform: translateX(-50%) translateY(-5px);
}

.tooltip .tooltiptext::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: var(--fun-yellow) transparent transparent transparent;
}

.sidebar a:hover,
.sidebar a.active,
.welcome-message:hover,
.summary:hover,
.example:hover,
.exercise:hover,
.installation:hover,
.theory:hover,
.exercise-item:hover {
    transform: none !important;
    box-shadow: none !important;
    border-left-color: transparent !important;
}