/* --- DEĞİŞKENLER VE TEMEL --- */
:root {
    --ref-gold: #c5a059; /* Hafif kurumsal bir ton */
    --ref-dark: #1f2328;
    --ref-bg: #ffffff;
    --ref-border: rgba(31,35,40,.08);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- HERO SECTION --- */
.ref-hero {
    background-color: #fcfbf9;
    padding: 80px 0 60px;
    border-bottom: 1px solid var(--ref-border);
}

.ref-kicker {
    display: block;
    font-weight: 800;
    font-size: 13px;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--ref-gold);
    margin-bottom: 15px;
}

.ref-title {
    font-family: var(--serif);
    font-size: clamp(32px, 5vw, 48px);
    color: var(--ref-dark);
    margin-bottom: 20px;
    line-height: 1.1;
}

.ref-desc {
    font-size: 18px;
    color: rgba(31,35,40,.7);
    line-height: 1.6;
    max-width: 650px;
    margin-bottom: 35px;
}

.ref-hero__actions {
    display: flex;
    gap: 15px;
}

.ref-btn {
    padding: 14px 28px;
    font-weight: 700;
    font-size: 14px;
    text-decoration: none;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.ref-btn--primary {
    background: var(--ref-dark);
    color: #fff;
}

.ref-btn--outline {
    border: 1px solid var(--ref-border);
    color: var(--ref-dark);
}

.ref-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

/* --- LİSTE VE FİLTRELEME --- */
.ref-list-section {
    padding: 60px 0 100px;
}

.ref-filter-bar {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 40px;
    flex-wrap: wrap;
    gap: 20px;
}

.ref-list-title {
    font-family: var(--serif);
    font-size: 28px;
    margin: 0;
}

.ref-search-input-wrapper {
    position: relative;
    width: 320px;
}

.ref-search {
    width: 100%;
    padding: 12px 15px 12px 40px;
    border: 1px solid var(--ref-border);
    background: #fdfdfd;
    outline: none;
    font-family: var(--sans);
    transition: var(--transition);
}

    .ref-search:focus {
        border-color: var(--ref-dark);
        background: #fff;
    }

.ref-search-icon {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0.4;
}

.ref-badge {
    margin-top: 10px;
    font-size: 12px;
    font-weight: 700;
    color: rgba(31,35,40,.5);
    text-align: right;
}

/* --- LOGO GRID & CARDS --- */
.ref-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 25px;
}

.ref-card {
    text-decoration: none;
    background: #fff;
    border: 1px solid var(--ref-border);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.ref-card__logo {
    height: 160px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 30px;
    background: #fff;
    border-bottom: 1px solid var(--ref-border);
}

    .ref-card__logo img {
        max-width: 100%;
        max-height: 100%;
        object-fit: contain;
        filter: grayscale(100%);
        opacity: 0.6;
        transition: var(--transition);
    }

.ref-card__info {
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.ref-card__name {
    font-weight: 700;
    color: var(--ref-dark);
    font-size: 15px;
}

.ref-card__link-icon {
    opacity: 0;
    transform: translate(-5px, 5px);
    transition: var(--transition);
}

/* Hover State */
.ref-card:hover {
    border-color: var(--ref-dark);
    box-shadow: 0 15px 35px rgba(0,0,0,0.06);
    transform: translateY(-5px);
}

    .ref-card:hover .ref-card__logo img {
        filter: grayscale(0%);
        opacity: 1;
        transform: scale(1.05);
    }

    .ref-card:hover .ref-card__link-icon {
        opacity: 1;
        transform: translate(0, 0);
    }

.ref-disclaimer {
    margin-top: 50px;
    font-size: 13px;
    color: rgba(31,35,40,.4);
    border-top: 1px solid var(--ref-border);
    padding-top: 20px;
}

/* Responsive */
@media (max-width: 768px) {
    .ref-filter-bar {
        flex-direction: column;
        align-items: flex-start;
    }

    .ref-search-input-wrapper {
        width: 100%;
    }

    .ref-hero {
        padding: 40px 0;
    }

    .ref-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
}

@media (max-width: 480px) {
    .ref-grid {
        grid-template-columns: 1fr;
    }

    .ref-card__logo {
        height: 140px;
    }
}