* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

:root {
    --bg-main: #f4f6f9;
    --bg-sidebar: #1e293b;
    --text-sidebar: #cbd5e1;
    --primary: #2563eb;
    --primary-light: #eff6ff;
    --card-bg: #ffffff;
    --border: #e2e8f0;
    --text-dark: #0f172a;
    --text-muted: #64748b;
}

body {
    display: flex;
    min-height: 100vh;
    background-color: var(--bg-main);
    color: var(--text-dark);
}

/* --- CONTENU PRINCIPAL --- */
.main-content {
    flex: 1;
    padding: 30px;
}

.top-header {
    margin-bottom: 25px;
}

.top-header h1 {
    font-size: 1.8rem;
    font-weight: 600;
}