/* Referanslar Sayfası Stilleri */
.references {
    padding: 40px 0;
    margin: 0;
    background: var(--light-gray);
}

.references .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

.filter-buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin: 0 0 40px 0;
    padding: 0;
    flex-wrap: wrap;
}

.filter-btn {
    background: #f8f9fa;
    border: 2px solid #e9ecef;
    padding: 12px 25px;
    border-radius: 30px;
    color: #495057;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    position: relative;
    overflow: hidden;
}

.filter-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, #2c3e50, #3498db);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 0;
}

.filter-btn span {
    position: relative;
    z-index: 1;
}

.filter-btn.active,
.filter-btn:hover {
    color: #fff;
    border-color: transparent;
}

.filter-btn.active::before,
.filter-btn:hover::before {
    opacity: 1;
}

.filter-btn:active {
    transform: scale(0.95);
}

.references-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
    margin: 0;
    padding: 20px;
}

.reference-item {
    background: #fff;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    position: relative;
    margin: 0;
}

.reference-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.15);
}

.reference-image {
    position: relative;
    overflow: hidden;
    padding-top: 75%; /* 4:3 aspect ratio */
}

.reference-image a {
    display: block;
    text-decoration: none;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.reference-image img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.reference-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    background: rgba(0,0,0,0.85);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: all 0.3s ease;
    padding: 20px;
    transform: translateY(100%);
}

.reference-item:hover .reference-overlay {
    opacity: 1;
    transform: translateY(0);
}

.reference-item:hover .reference-image img {
    transform: scale(1.1);
}

.reference-overlay h3 {
    color: #fff;
    font-size: 1.3rem;
    margin-bottom: 10px;
    text-align: center;
    transform: translateY(20px);
    transition: all 0.3s ease;
    opacity: 0;
}

.reference-overlay p {
    color: #fff;
    font-size: 1.1rem;
    font-weight: 500;
    transform: translateY(20px);
    transition: all 0.3s ease 0.1s;
    opacity: 0;
}

.reference-item:hover .reference-overlay h3,
.reference-item:hover .reference-overlay p {
    transform: translateY(0);
    opacity: 1;
}

/* Popup Stilleri */
.references-image-popup {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.95);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    opacity: 0;
    transition: all 0.3s ease;
}

.references-image-popup.active {
    display: flex;
    opacity: 1;
}

.references-image-popup .image-container {
    position: relative;
    max-width: 90%;
    max-height: 85vh;
}

.references-image-popup img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 0 30px rgba(0,0,0,0.5);
    transform: scale(0.9);
    transition: all 0.3s ease;
}

.references-image-popup.active img {
    transform: scale(1);
}

.popup-caption {
    position: absolute;
    bottom: 30px;
    left: 0;
    width: 100%;
    color: #fff;
    text-align: center;
    padding: 15px;
    font-size: 1.4rem;
    font-weight: 500;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
    background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
}

.close-button {
    position: absolute;
    top: -25px;
    right: -25px;
    color: #fff;
    font-size: 2rem;
    cursor: pointer;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    transition: all 0.3s ease;
    z-index: 10000;
    padding: 0;
}

.close-button:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: rotate(90deg);
    border-color: rgba(255, 255, 255, 0.5);
}

.close-button i {
    font-size: 1.8rem;
    color: #fff;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

/* Responsive Tasarım */
@media (max-width: 992px) {
    .references-grid {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    }
}

@media (max-width: 768px) {
    .references {
        padding: 30px 0;
    }
    
    .filter-buttons {
        margin: 0 0 30px 0;
    }
    
    .references-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 20px;
        padding: 10px;
    }

    .reference-overlay h3 {
        font-size: 1.2rem;
    }

    .popup-caption {
        font-size: 1.2rem;
        padding: 10px;
    }

    .close-button {
        top: -20px;
        right: -20px;
        width: 40px;
        height: 40px;
    }

    .close-button i {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .filter-buttons {
        gap: 10px;
    }

    .filter-btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }

    .reference-overlay h3 {
        font-size: 1.1rem;
    }

    .popup-caption {
        font-size: 1.1rem;
        padding: 10px;
    }
}