/* ==========================================================================
   SCROLL TO TOP BUTTON - PREMIUM DESIGN
   ========================================================================== */

/* الزر الأساسي */
.scroll-to-top-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #0077b6 0%, #0d3b66 100%);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    z-index: 9999;
    box-shadow: 0 8px 25px rgba(0, 119, 182, 0.4);
    transition: all 0.2s ease-out;
    opacity: 0;
    visibility: hidden;
    display: none;
    /* مخفي تماماً عند التحميل */
    transform: scale(0) rotate(-180deg);
}

/* عند الظهور */
.scroll-to-top-btn.show {
    display: block;
    opacity: 1;
    visibility: visible;
    transform: scale(1) rotate(0deg);
}

/* الحاوية الداخلية */
.scroll-icon-wrapper {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* الأيقونة */
.scroll-icon {
    color: #ffffff;
    font-size: 1.3rem;
    z-index: 2;
    position: relative;
    transition: all 0.3s ease;
}

/* دائرة التقدم */
.scroll-progress-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 56px;
    height: 56px;
    transform: translate(-50%, -50%) rotate(-90deg);
}

.scroll-progress-ring svg {
    width: 56px;
    height: 56px;
}

.progress-ring-circle {
    stroke: #FFC107;
    stroke-dasharray: 150.80;
    /* 2 * PI * 24 */
    stroke-dashoffset: 150.80;
    transition: stroke-dashoffset 0.1s linear;
    filter: drop-shadow(0 0 6px rgba(255, 193, 7, 0.6));
}

/* Tooltip */
.scroll-tooltip {
    display: none !important;
    /* مخفي نهائياً */
}

/* Hover Effects */
.scroll-to-top-btn:hover {
    transform: scale(1.1) translateY(-3px);
    box-shadow: 0 12px 35px rgba(0, 119, 182, 0.5);
    background: linear-gradient(135deg, #0d3b66 0%, #0077b6 100%);
}

.scroll-to-top-btn:hover .scroll-icon {
    animation: arrowBounce 0.6s ease-in-out infinite;
}

/* أنيميشن السهم */
@keyframes arrowBounce {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-5px);
    }
}

/* تأثير النقر */
.scroll-to-top-btn:active {
    transform: scale(0.95);
}

/* تأثير النبض عند الظهور لأول مرة */
.scroll-to-top-btn.show {
    animation: pulseAppear 0.6s ease;
}

@keyframes pulseAppear {
    0% {
        box-shadow: 0 8px 25px rgba(0, 119, 182, 0.4);
    }

    50% {
        box-shadow: 0 8px 40px rgba(255, 215, 0, 0.6);
    }

    100% {
        box-shadow: 0 8px 25px rgba(0, 119, 182, 0.4);
    }
}

/* تأثير الشعاع الدائري */
.scroll-to-top-btn::before {
    content: '';
    position: absolute;
    top: -5px;
    left: -5px;
    right: -5px;
    bottom: -5px;
    background: linear-gradient(45deg, #ffd700, #0077b6, #ffd700);
    border-radius: 50%;
    z-index: -1;
    opacity: 0;
    transition: opacity 0.3s ease;
    filter: blur(10px);
    animation: rotate 3s linear infinite;
}

.scroll-to-top-btn:hover::before {
    opacity: 0.7;
}

@keyframes rotate {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

/* النقاط المتحركة حول الزر */
.scroll-to-top-btn::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    border: 2px dashed rgba(255, 215, 0, 0.3);
    top: 0;
    left: 0;
    animation: rotateDots 8s linear infinite;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.scroll-to-top-btn:hover::after {
    opacity: 1;
}

@keyframes rotateDots {
    0% {
        transform: rotate(0deg) scale(1.3);
    }

    100% {
        transform: rotate(360deg) scale(1.3);
    }
}

/* Responsive للشاشات الصغيرة */
@media (max-width: 768px) {
    .scroll-to-top-btn {
        width: 50px;
        height: 50px;
        bottom: 20px;
        right: 20px;
    }

    .scroll-icon {
        font-size: 1.1rem;
    }

    .scroll-progress-ring {
        width: 46px;
        height: 46px;
    }

    .scroll-progress-ring svg {
        width: 46px;
        height: 46px;
    }

    .scroll-tooltip {
        display: none;
        /* إخفاء Tooltip في الموبايل */
    }
}

/* تحسين الأداء */
.scroll-to-top-btn {
    will-change: transform, opacity;
    -webkit-tap-highlight-color: transparent;
}

/* تأثير الضوء المتحرك */
@keyframes shimmer {
    0% {
        background-position: -100% 0;
    }

    100% {
        background-position: 200% 0;
    }
}

.scroll-to-top-btn:hover {
    background: linear-gradient(135deg, #0077b6 0%, #0d3b66 50%, #0077b6 100%);
    background-size: 200% auto;
    animation: shimmer 2s linear infinite;
}