html {
    scroll-behavior: smooth;
}

body {
    font-family: Arial, sans-serif;
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
    line-height: 1.6;
    background-color: #ffffff;
    color: #333333;
    transition: background-color 0.3s, color 0.3s;
}

body.dark-mode {
    background-color: #1e1e1e;
    color: #e0e0e0;
}

code {
    background-color: #f1f5f9;
    color: #d97706;
    font-family: "Courier New", Courier, monospace;
    font-weight: bold;
    font-size: 0.9em;
    padding: 2px 6px;
    border-radius: 4px;
    border: 1px solid #cbd5e1;
}

body.dark-mode code {
    background-color: #0f172a;
    color: #fbbf24;
    border-color: #334155;
}

h1,
h2,
h3,
h4 {
    color: #2c3e50;
    transition: color 0.3s;
}

body.dark-mode h1,
body.dark-mode h2,
body.dark-mode h3,
body.dark-mode h4 {
    color: #76b9ed;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 10px;
}

.sommaire {
    background-color: #f0f4f8;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 30px;
    transition: background-color 0.3s, border-color 0.3s;
}

body.dark-mode .sommaire {
    background-color: #252d37;
    border-color: #3b82f6;
}

.sommaire h2 {
    margin-top: 0;
    font-size: 1.3em;
    color: #1e293b;
    margin-bottom: 15px;
}

body.dark-mode .sommaire h2 {
    color: #60a5fa;
}

.sommaire details {
    margin-bottom: 10px;
    background-color: #ffffff;
    border: 1px solid #cbd5e1;
    border-radius: 6px;
    padding: 8px 12px;
    transition: background-color 0.3s, border-color 0.3s;
}

body.dark-mode .sommaire details {
    background-color: #1e293b;
    border-color: #475569;
}

.sommaire summary {
    font-weight: bold;
    cursor: pointer;
    color: #1e293b;
    outline: none;
    user-select: none;
}

body.dark-mode .sommaire summary {
    color: #93c5fd;
}

.sommaire summary:hover {
    color: #2563eb;
}

.sommaire ul {
    list-style-type: none;
    padding-left: 15px;
    margin-top: 10px;
    margin-bottom: 5px;
}

.sommaire li {
    margin-bottom: 6px;
}

.sommaire a {
    color: #2563eb;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.sommaire a:hover {
    text-decoration: underline;
    color: #1d4ed8;
}

body.dark-mode .sommaire a {
    color: #60a5fa;
}

body.dark-mode .sommaire a:hover {
    color: #93c5fd;
}

.section-partie-container {
    counter-reset: exo-counter;
}

.section-partie {
    margin-top: 40px;
    margin-bottom: 20px;
    padding: 15px 20px;
    background-color: #2c3e50;
    color: #ffffff;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.section-partie h2 {
    color: #ffffff;
    margin: 0;
    font-size: 1.5em;
}

body.dark-mode .section-partie {
    background-color: #1a364a;
    border: 1px solid #76b9ed;
}

body.dark-mode .section-partie h2 {
    color: #76b9ed;
}

.exercice {
    border: 1px solid #ddd;
    padding: 20px;
    border-radius: 5px;
    background-color: #f9f9f9;
    margin-bottom: 20px;
    transition: background-color 0.3s, border-color 0.3s;
    counter-increment: exo-counter;
}

/* SUPPRESSION DU DOUBLON ICI : On a retiré le .exercice h3::before */

body.dark-mode .exercice {
    background-color: #2a2a2a;
    border-color: #444444;
}

button {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    margin-top: 10px;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #2980b9;
}

.theme-btn {
    background-color: #2c3e50;
    margin-top: 0;
}

body.dark-mode .theme-btn {
    background-color: #f39c12;
    color: #1e1e1e;
}

.correction {
    display: none;
    margin-top: 10px;
    padding: 10px;
    background-color: #e8f4fc;
    border-radius: 5px;
    transition: background-color 0.3s, color 0.3s;
}

body.dark-mode .correction {
    background-color: #1a364a;
    color: #e0e0e0;
}

pre {
    background-color: #f5f5f5;
    padding: 10px;
    border-radius: 5px;
    overflow-x: auto;
    color: #222222;
    transition: background-color 0.3s, color 0.3s;
}

body.dark-mode pre {
    background-color: #111111;
    color: #66d9ef;
}