.smart-scroll-btn {
    position: fixed;
    right: 33px;
    bottom: 33%;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;

    /* --- DURUM 1: SAKİN/TRANSPARAN HALİ --- */
    opacity: 0.2;
    /* İyice transparan */
    filter: grayscale(100%);
    /* Siyah-beyaz */
    transform: scale(0.9);
    transition: all 0.4s ease;
    /* Geçişler yağ gibi olsun */
}

/* --- DURUM 2: SCROLL YAPARKEN VEYA HOVER --- */
/* JS bu class'ı scroll anında ekleyecek */
.smart-scroll-btn.is-active,
.smart-scroll-btn:hover {
    opacity: 1;
    filter: grayscale(0%);
    transform: scale(1);
}

.smart-scroll-btn:hover {
    transform: translateY(-8px) scale(1.1);
}

/* Tasarım Detayları */
.smart-scroll-btn .btn-line {
    width: 2px;
    height: 40px;
    background: #ff6b00;
    margin-bottom: 8px;
}

.smart-scroll-btn .btn-text {
    writing-mode: vertical-rl;
    color: #0e0000;
    font-size: 0.7rem;
    letter-spacing: 2px;
    font-weight: bold;
}

.smart-scroll-btn .btn-arrow {
    color: #ff6b00;
    font-size: 1.4rem;
}