/* Accent cyan/bleu pour l'esprit Fibre Optique */
:root {
    --accent-1: #0ea5e9;
    --accent-3: #7dd3fc;
    --gradient: linear-gradient(135deg, #0ea5e9 0%, #0369a1 50%, #075985 100%);
    --gradient-text: linear-gradient(135deg, #bae6fd, #38bdf8, #0284c7);
    --gradient-subtle: linear-gradient(135deg, rgba(14, 165, 233, 0.12), rgba(3, 105, 161, 0.08));
    --border-hover: rgba(56, 189, 248, 0.4);
    --shadow-glow: 0 0 60px rgba(14, 165, 233, 0.12);
}

.orb-1 {
    background: radial-gradient(circle, #0284c7, transparent 70%);
}

.orb-2 {
    background: radial-gradient(circle, #0ea5e9, transparent 70%);
}

/* Espaces Concept */
.concept-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
    margin-top: 32px;
}

.concept-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.07);
    border-radius: 16px;
    padding: 28px 24px;
    transition: border-color 0.3s;
}

.concept-card:hover {
    border-color: var(--border-hover);
}

.concept-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
}

.concept-icon {
    width: 42px;
    height: 42px;
    border-radius: 10px;
    background: var(--gradient-subtle);
    border: 1px solid var(--border-hover);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: var(--accent-3);
    flex-shrink: 0;
}

.concept-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: #fff;
}

.concept-card p {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.55);
    line-height: 1.6;
    margin: 0;
}