/* Couleurs sobres et professionnelles */
:root {
    --dark: #2c3e50;
    --grey: #ecf0f1;
    --border: #bdc3c7;
    --blue: #34495e;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    background-color: #f4f4f4;
    color: #333;
    line-height: 1.6;
    margin: 0;
    padding: 20px;
}

.main-container {
    max-width: 900px;
    margin: auto;
    background: #fff;
    padding: 40px;
    border: 1px solid var(--border);
    box-shadow: 2px 2px 10px rgba(0,0,0,0.05);
}

header {
    text-align: center;
    margin-bottom: 30px;
}

h1 { color: var(--dark); font-size: 24px; margin-bottom: 5px; }
h2 { color: var(--blue); border-bottom: 2px solid var(--grey); padding-bottom: 10px; margin-top: 40px; }

nav {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 30px;
    background: var(--grey);
    padding: 10px;
}

nav a {
    text-decoration: none;
    color: var(--dark);
    font-weight: bold;
    font-size: 14px;
}

nav a:hover { color: #000; }

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

th, td {
    border: 1px solid var(--border);
    padding: 12px;
    text-align: left;
}

th { background-color: var(--grey); }

.grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.box {
    padding: 15px;
    border: 1px solid var(--border);
    background: #fafafa;
}

.ascii-art {
    font-family: monospace;
    background: #000;
    color: #0f0;
    padding: 20px;
    text-align: center;
    border-radius: 5px;
    margin-top: 20px;
}

.alert-box {
    border-left: 5px solid var(--dark);
    background: var(--grey);
    padding: 15px;
}

footer {
    margin-top: 50px;
    text-align: center;
    font-size: 12px;
    color: #888;
}