:root {
    --bg: #f4f6f8;
    --card: #ffffff;

    --text-main: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;

    --border: #e2e8f0;

    --blue: #334155;        /* Group */
    --gold: #d6b86c;        /* Consulting */
    --green: #3E7F5A;       /* Design */
    --terracotta: #7A4E34;  /* Immo */

    --shadow:
        0 10px 30px rgba(0, 0, 0, 0.08),
        0 2px 6px rgba(0, 0, 0, 0.04);

    --radius: 14px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
                 Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text-main);
}

/* ===== STRUCTURE GÉNÉRALE ===== */

.hub {
    max-width: 980px;
    margin: 0 auto;
    padding: 48px 20px;
}

.box {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

/* ===== HERO ===== */

.hero {
    text-align: center;
    padding: 40px 32px;
    margin-bottom: 28px;
}

.group-logo {
    display: block;
    width: 220px;
    max-width: 100%;
    height: auto;
    margin: 0 auto 20px auto;
}

.tagline {
    margin: 0 0 12px 0;
    font-size: 1rem;
    color: var(--text-secondary);
}

.intro {
    max-width: 700px;
    margin: 0 auto;
    font-size: 0.98rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

/* ===== SECTION ECOSYSTEM ===== */

.ecosystem {
    padding: 32px;
}

.ecosystem h2 {
    margin: 0 0 24px 0;
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--blue);
    text-align: center;
}

/* ===== GRILLE DES ESPACES ===== */

.spaces-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 22px;
}

.space-card {
    display: block;
    text-decoration: none;
    color: inherit;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.space-card:hover {
    transform: translateY(-3px);
    box-shadow:
        0 14px 30px rgba(0, 0, 0, 0.08),
        0 4px 10px rgba(0, 0, 0, 0.04);
}

/* ===== BORDURES D’ACCENT PAR ACTIVITÉ ===== */

.space-card.consulting:hover {
    border-color: var(--gold);
}

.space-card.design:hover {
    border-color: var(--green);
}

.space-card.immo:hover {
    border-color: var(--terracotta);
}

/* ===== LOGOS DES CARTES ===== */

.space-logo {
    display: block;
    width: 160px;
    max-width: 100%;
    height: auto;
    margin-bottom: 14px;
}

/* ===== CONTENU DES CARTES ===== */

.space-content h3 {
    margin: 0 0 8px 0;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-main);
}

.space-content p {
    margin: 0;
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--text-muted);
}

/* ===== COULEUR DU TITRE SELON L’ACTIVITÉ ===== */

.space-card.consulting .space-content h3 {
    color: var(--gold);
}

.space-card.design .space-content h3 {
    color: var(--green);
}

.space-card.immo .space-content h3 {
    color: var(--terracotta);
}

/* ===== FOOTER ===== */

.site-footer {
    margin-top: 24px;
    text-align: center;
    font-size: 0.78rem;
    color: var(--text-muted);
}

/* ===== RESPONSIVE ===== */

@media (max-width: 800px) {
    body {
        overflow-x: hidden;
    }

    .hub {
        padding: 20px 12px;
    }

    .box {
        width: 100%;
    }

    .hero {
        padding: 24px 16px;
        margin-bottom: 18px;
    }

    .group-logo {
        width: min(180px, 70vw);
        max-width: 100%;
        height: auto;
        margin: 0 auto 16px auto;
    }

    .tagline {
        font-size: 0.95rem;
        line-height: 1.4;
    }

    .intro {
        font-size: 0.92rem;
        line-height: 1.5;
    }

    .ecosystem {
        padding: 20px 16px;
    }

    .ecosystem h2 {
        margin-bottom: 18px;
    }

    .spaces-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .space-card {
        padding: 18px 14px;
        text-align: center;
    }

    .space-logo {
        display: block;
        width: 100%;
        max-width: 220px;
        height: auto;
        margin: 0 auto 14px auto;
    }

    .space-content h3 {
        font-size: 1rem;
        line-height: 1.3;
        margin-bottom: 6px;
    }

    .space-content p {
        font-size: 0.84rem;
        line-height: 1.45;
    }

    .site-footer {
        margin-top: 18px;
        padding-bottom: 8px;
    }
}