/* ── BILLBOARD GRID SECTION ── */
.billboard-grid-section {
    background: #111;
    padding: 80px 0 100px;
    overflow: hidden;
    will-change: transform;
    backface-visibility: hidden;
}

.bgrid-header {
    text-align: center;
    padding: 0 24px 60px;
}

.bgrid-title {
    font-family: 'Poppins', sans-serif;
    font-size: clamp(1.8rem, 4vw, 3.4rem);
    font-weight: 300;
    color: #fff;
    letter-spacing: -0.01em;
}

.bgrid-wrap {
    max-width: 1160px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Each row is an independent parallax target */
.bgrid-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.bgrid-card {
    border-radius: 22px;
    overflow: hidden;
    aspect-ratio: 3 / 4;
    background: #1a1a2e;
}

.bgrid-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.4s ease;
}

.bgrid-card:hover img {
    transform: scale(1.04);
}

.bgrid-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
}

@media (max-width: 700px) {
    .bgrid-wrap { padding: 0 16px; }
    .bgrid-row  { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .bgrid-card { border-radius: 14px; }
}

@media (prefers-reduced-motion: reduce) {
    .billboard-grid-section { transform: none !important; will-change: auto; }
    .bgrid-card img { transition: none; }
}