/* ============================================
   ScrollToTop.css - دکمه اسکرول به بالای صفحه
   ============================================ */

.scroll-to-top {
    position: fixed;
    bottom: var(--gap-2xl, 2rem);
    right: var(--gap-2xl, 2rem);
    width: 4rem;
    height: 4rem;
    border-radius: 50%;
    background: var(--primary-dark, #1a2a3a);
    border: var(--border-md, 2px) solid var(--primary-blue, #4A90E2);
    box-shadow: var(--shadow-md, 0 4px 15px rgba(0, 0, 0, 0.2));
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-bounce, 0.3s cubic-bezier(0.4, 0, 0.2, 1));
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: scale(0.8) translateY(20px);
    padding: 4px;
    overflow: hidden;
}

.scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: scale(1) translateY(0);
}

.scroll-to-top img {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: contain;
    margin: 0;
    padding: 0;
}

.scroll-to-top:hover {
    background: var(--primary-blue, #4A90E2);
    transform: scale(1.08);
    box-shadow: 0 4px 25px rgba(74, 144, 226, 0.5);
}

.scroll-to-top:active {
    transform: scale(0.92);
}

/* ============================================
   واکنش‌گرایی
   ============================================ */

@media(max-width: 767px) {
    .scroll-to-top {
        bottom: 1.2rem;
        right: 1.2rem;
        width: 3.2rem;
        height: 3.2rem;
        padding: 3px;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
        border-width: var(--border-md, 2px);
    }
    .scroll-to-top.visible {
        transition: all var(--transition-bounce, 0.3s cubic-bezier(0.4, 0, 0.2, 1));
    }
}

@media(min-width: 768px) and (max-width: 1023px) {
    .scroll-to-top {
        bottom: var(--gap-xl, 1.5rem);
        right: var(--gap-xl, 1.5rem);
        width: 3.5rem;
        height: 3.5rem;
        padding: 3px;
    }
}

@media(min-width: 1024px) and (max-width: 1199px) {
    .scroll-to-top {
        bottom: 1.8rem;
        right: 1.8rem;
        width: 3.8rem;
        height: 3.8rem;
        padding: 4px;
    }
}

@media(min-width: 1200px) {
    .scroll-to-top {
        bottom: 2.5rem;
        right: 2.5rem;
        width: 4.5rem;
        height: 4.5rem;
        padding: 5px;
    }
}

/* ===== پشتیبانی از RTL ===== */
[dir="rtl"] .scroll-to-top {
    right: auto;
    left: var(--gap-2xl, 2rem);
}

@media(max-width: 767px) {
    [dir="rtl"] .scroll-to-top {
        right: auto;
        left: 1.2rem;
    }
}

@media(min-width: 768px) and (max-width: 1023px) {
    [dir="rtl"] .scroll-to-top {
        right: auto;
        left: var(--gap-xl, 1.5rem);
    }
}

@media(min-width: 1200px) {
    [dir="rtl"] .scroll-to-top {
        right: auto;
        left: 2.5rem;
    }
}