/* ==========================================================================
   REFERENZEN.CSS - Clean Filter-Grid & Minimalist 3D Flip Cards
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. FILTER BUTTONS WRAPPER
   -------------------------------------------------------------------------- */
.reference-filter {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    margin: 2rem 0 3rem 0;
    flex-wrap: wrap;
}

.reference-filter .btn.active {
    background-color: #00d4ff;
    color: #ffffff;
    box-shadow: 0 0 15px rgba(0, 212, 255, 0.4);
    border-color: #00d4ff;
}

/* --------------------------------------------------------------------------
   2. GRID & CARD CONTAINER (Angepasst für 6 Spalten)
   -------------------------------------------------------------------------- */
.reference-grid {
    display: grid;
    /* Reduzierte min-width (150px), damit 6 Spalten Platz finden */
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 1rem; 
}

.ref-card {
    display: block;
    background-color: transparent;
    height: 140px; /* Höhe für das 6-Spalten-Layout kompakt gehalten */
    perspective: 1000px;
    cursor: pointer;
}

.ref-card.hidden {
    display: none !important;
}

.card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    transform-style: preserve-3d;
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
    border-radius: 12px;
}

/* Drehung auf Desktop via Hover */
@media (hover: hover) {
    .ref-card:hover .card-inner {
        transform: rotateY(180deg);
    }
}

/* Drehung auf Mobile / Klick via JS-Klasse */
.ref-card.flipped .card-inner {
    transform: rotateY(180deg) !important;
}

.card-front, .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    border-radius: 12px;
    padding: 1rem;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
}

/* --------------------------------------------------------------------------
   3. VORDERSEITE
   -------------------------------------------------------------------------- */
.card-front {
    background-color: #ffffff;
    padding: 0;
    overflow: hidden;
}

.logo-wrapper {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* --------------------------------------------------------------------------
   4. RÜCKSEITE (Glassmorphism mit Button)
   -------------------------------------------------------------------------- */
.card-back {
    background: transparent;
    border: 1px solid #00d4ff;
    box-shadow: 0 0 15px rgba(0, 212, 255, 0.2);
    transform: rotateY(180deg);
    padding: 0.75rem 0.5rem; 
    display: flex;
    flex-direction: column;
    justify-content: center; 
    align-items: center;     
    gap: 0.5rem;            
}

.card-back h3 {
    color: #00d4ff;
    margin: 0;
    font-size: 1.3rem;
    line-height: 1.2;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card-btn {
    display: inline-block;
    padding: 0.35rem 0.6rem;
    font-size: 0.7rem;
    white-space: nowrap;     
    color: #ffffff;
    background-color: transparent;
    border: 1px solid #00d4ff;
    border-radius: 20px;
    text-decoration: none;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card-btn:hover {
    background-color: #00F0FF;
    color: #ffffff; 
    text-decoration: none !important;
    box-shadow: 0 0 12px rgba(0, 240, 255, 0.8);
}

@media (min-width: 1200px) {
    .reference-grid {
        /* Feste 6 Spalten ab einer Desktop-Breite von 1200px */
        grid-template-columns: repeat(6, 1fr);
    }
}