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

:root {
    --primary: #667eea;
    --secondary: #764ba2;
    --light-bg: #f0f4ff;
    --dark-bg: #f9f9f9;
    --text: #333;
    --border: #e0e0e0;
    --success: #28a745;
}

body {
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    padding: 20px;
    padding-top: 0;
    min-height: 100vh;
    color: var(--text);
}

header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    padding: 40px 30px;
    text-align: center;
}

header h1 {
    font-size: 32px;
    margin-bottom: 10px;
}

header p {
    font-size: 14px;
    opacity: 0.9;
}

main {
    margin-top: 30px;
    margin-left: 0;
    margin-right: 0;
    padding: 20px;
}

/*
  Important :
  Les styles ci-dessous concernent uniquement une navigation
  placée dans .container. Ils ne touchent plus .global-navbar.
*/
.main-nav {
    background-color: var(--dark-bg);
    padding: 15px 30px;
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.main-nav a {
    color: var(--primary);
    text-decoration: none;
    font-weight: bold;
    padding: 8px 15px;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.main-nav a:hover {
    background-color: var(--primary);
    color: white;
}

.main-nav a.active {
    background-color: var(--primary);
    color: white;
}

.content {
    padding: 40px 30px;
}

section {
    margin-bottom: 50px;
    padding: 30px;
    background-color: var(--light-bg);
    border-radius: 8px;
    border-left: 5px solid var(--primary);
}

section h2 {
    color: var(--primary);
    font-size: 24px;
    margin-bottom: 15px;
}

section p {
    line-height: 1.8;
    margin-bottom: 15px;
    font-size: 15px;
}

section ul {
    margin-left: 25px;
    list-style: none;
}

section li {
    padding: 10px 0 10px 20px;
    line-height: 1.6;
    position: relative;
}

section li::before {
    content: "→ ";
    color: var(--secondary);
    font-weight: bold;
    position: absolute;
    left: 0;
}

section a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

section a:hover {
    text-decoration: underline;
    color: var(--secondary);
}

details {
    background-color: white;
    padding: 15px;
    border-radius: 6px;
    margin: 15px 0;
    border-left: 3px solid var(--secondary);
}

summary {
    cursor: pointer;
    color: var(--primary);
    font-weight: bold;
    padding: 15px 15px 10px;
    margin: -15px -15px 0;
    border-radius: 6px 6px 0 0;
}

summary:hover {
    background-color: var(--light-bg);
}

details p {
    margin-top: 15px;
    font-size: 14px;
}

details ul {
    margin-top: 10px;
}

details li {
    font-size: 14px;
}

.highlight {
    background-color: #fff3cd;
    padding: 20px;
    border-radius: 8px;
    border-left: 5px solid #ffc107;
    margin: 20px 0;
}

.highlight p {
    color: #856404;
    margin: 0;
}

footer {
    background-color: var(--dark-bg);
    padding: 20px 30px;
    text-align: center;
    color: #666;
    font-size: 12px;
    border-top: 1px solid var(--border);
}

footer a {
    color: var(--primary);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

.navigation {
    display: flex;
    justify-content: space-between;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 2px solid var(--primary);
}

.navigation a {
    background-color: var(--primary);
    color: white;
    padding: 12px 20px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s ease;
}

.navigation a:hover {
    background-color: var(--secondary);
}

.navigation a:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 24px;
    }

    .container nav {
        flex-direction: column;
        gap: 10px;
    }

    section {
        padding: 20px;
    }

    .content {
        padding: 20px;
    }

    .navigation {
        flex-direction: column;
        gap: 10px;
    }

    .navigation a {
        text-align: center;
    }
}