/**
 * Sliva Scroll-to-Top Styles
 * 
 * 6 Дизайнерских пресетов:
 * 1. theme-adaptive (Адаптивный Glow под тему сателлита)
 * 2. cyber-neon (Киберпанк неоновый бирюзовый контур)
 * 3. glass-minimal (Стеклянный глассморфизм с blur-эффектом)
 * 4. progress-ring (Круговой SVG-индикатор прокрутки 0-100%)
 * 5. luxury-gold (Золотой металлический градиент 24K)
 * 6. floating-pill (Капсула-бейдж с текстом «Наверх»)
 */

.scroll-to-top,
[data-scroll-top="btn"] {
    position: fixed;
    bottom: 28px;
    right: 28px;
    z-index: 99999;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px) scale(0.9);
    transition: opacity 0.25s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.25s cubic-bezier(0.16, 1, 0.3, 1),
                visibility 0.25s,
                box-shadow 0.25s,
                background 0.25s;
    box-sizing: border-box;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.scroll-to-top.is-visible,
[data-scroll-top="btn"].is-visible,
[data-scroll-top="btn"][data-visible="true"] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.scroll-to-top:hover,
[data-scroll-top="btn"]:hover {
    transform: translateY(-4px) scale(1.04);
}

.scroll-to-top:active,
[data-scroll-top="btn"]:active {
    transform: translateY(0) scale(0.96);
}

.scroll-to-top .scroll-top-icon,
[data-scroll-top="btn"] [data-scroll-top="icon"],
[data-scroll-top="btn"] .scroll-top-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s ease;
    line-height: 1;
}

.scroll-to-top .scroll-top-icon svg,
[data-scroll-top="btn"] [data-scroll-top="icon"] svg,
[data-scroll-top="btn"] .scroll-top-icon svg {
    display: block;
    width: 20px;
    height: 20px;
}

.scroll-to-top .scroll-top-icon-custom,
[data-scroll-top="btn"] [data-scroll-top="icon-custom"],
[data-scroll-top="btn"] .scroll-top-icon-custom {
    font-size: 20px;
    display: inline-block;
    line-height: 1;
}

.scroll-to-top:hover .scroll-top-icon,
[data-scroll-top="btn"]:hover [data-scroll-top="icon"],
[data-scroll-top="btn"]:hover .scroll-top-icon {
    transform: translateY(-2px);
}

/* 1. ПРЕСЕТ: THEME ADAPTIVE (В стиле темы сателлита) */
.scroll-top--theme-adaptive,
[data-scroll-top="btn"][data-style="theme-adaptive"] {
    background: var(--portal-accent, #6366f1);
    color: #ffffff;
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.4),
                0 0 0 1px rgba(255, 255, 255, 0.15) inset;
}
.scroll-top--theme-adaptive:hover,
[data-scroll-top="btn"][data-style="theme-adaptive"]:hover {
    box-shadow: 0 8px 24px var(--portal-accent-glow, rgba(99, 102, 241, 0.6)),
                0 0 0 1px rgba(255, 255, 255, 0.3) inset;
    filter: brightness(1.08);
}

/* 2. ПРЕСЕТ: CYBER NEON (Киберпанк) */
.scroll-top--cyber-neon,
[data-scroll-top="btn"][data-style="cyber-neon"] {
    background: #0d1117;
    color: #00f0ff;
    border: 1.5px solid #00f0ff;
    box-shadow: 0 0 15px rgba(0, 240, 255, 0.35),
                0 0 5px rgba(0, 240, 255, 0.2) inset;
}
.scroll-top--cyber-neon:hover,
[data-scroll-top="btn"][data-style="cyber-neon"]:hover {
    background: #00f0ff;
    color: #0d1117;
    box-shadow: 0 0 25px rgba(0, 240, 255, 0.8),
                0 0 40px rgba(0, 240, 255, 0.4);
}

/* 3. ПРЕСЕТ: FROSTED GLASS (Стеклянный Глассморфизм) */
.scroll-top--glass-minimal,
[data-scroll-top="btn"][data-style="glass-minimal"] {
    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    color: #0f172a;
    border: 1px solid rgba(255, 255, 255, 0.6);
    box-shadow: 0 8px 32px rgba(15, 23, 42, 0.12),
                0 0 0 1px rgba(0, 0, 0, 0.05);
}
.theme-dark .scroll-top--glass-minimal,
[data-theme="dark"] .scroll-top--glass-minimal,
.theme-dark [data-scroll-top="btn"][data-style="glass-minimal"],
[data-theme="dark"] [data-scroll-top="btn"][data-style="glass-minimal"] {
    background: rgba(30, 41, 59, 0.75);
    color: #f8fafc;
    border: 1px solid rgba(255, 255, 255, 0.12);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}
.scroll-top--glass-minimal:hover,
[data-scroll-top="btn"][data-style="glass-minimal"]:hover {
    background: rgba(255, 255, 255, 0.9);
    box-shadow: 0 12px 36px rgba(15, 23, 42, 0.18);
}
.theme-dark .scroll-top--glass-minimal:hover,
[data-theme="dark"] .scroll-top--glass-minimal:hover,
.theme-dark [data-scroll-top="btn"][data-style="glass-minimal"]:hover,
[data-theme="dark"] [data-scroll-top="btn"][data-style="glass-minimal"]:hover {
    background: rgba(30, 41, 59, 0.95);
    border-color: rgba(255, 255, 255, 0.25);
}

/* 4. ПРЕСЕТ: CIRCULAR PROGRESS (SVG-кольцо прогресса) */
.scroll-top--progress-ring,
[data-scroll-top="btn"][data-style="progress-ring"] {
    background: #0f172a;
    color: #ffffff;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}
.theme-dark .scroll-top--progress-ring,
[data-theme="dark"] .scroll-top--progress-ring,
.theme-dark [data-scroll-top="btn"][data-style="progress-ring"],
[data-theme="dark"] [data-scroll-top="btn"][data-style="progress-ring"] {
    background: #1e293b;
    color: #ffffff;
}
.scroll-top--progress-ring .scroll-top-progress,
[data-scroll-top="btn"][data-style="progress-ring"] [data-scroll-top="progress"],
[data-scroll-top="progress"] {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 44px;
    height: 44px;
    transform: rotate(-90deg);
    pointer-events: none;
}
.scroll-top--progress-ring .scroll-top-progress-bg,
[data-scroll-top="btn"][data-style="progress-ring"] [data-scroll-top="progress-bg"],
[data-scroll-top="progress-bg"] {
    stroke: rgba(255, 255, 255, 0.15);
}
.scroll-top--progress-ring .scroll-top-progress-bar,
[data-scroll-top="btn"][data-style="progress-ring"] [data-scroll-top="progress-bar"],
[data-scroll-top="progress-bar"] {
    stroke: var(--portal-accent, #6366f1);
    stroke-linecap: round;
    transition: stroke-dashoffset 0.1s linear;
}
.scroll-top--progress-ring:hover,
[data-scroll-top="btn"][data-style="progress-ring"]:hover {
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.45);
}

/* 5. ПРЕСЕТ: LUXURY GOLD (Золотой металлик 24K) */
.scroll-top--luxury-gold,
[data-scroll-top="btn"][data-style="luxury-gold"] {
    background: linear-gradient(135deg, #bf953f 0%, #fcf6ba 28%, #b38728 55%, #fbf5b7 75%, #aa771c 100%);
    color: #1a160d;
    box-shadow: 0 4px 20px rgba(191, 149, 63, 0.4),
                0 0 0 1px rgba(255, 255, 255, 0.4) inset;
}
.scroll-top--luxury-gold:hover,
[data-scroll-top="btn"][data-style="luxury-gold"]:hover {
    box-shadow: 0 8px 30px rgba(191, 149, 63, 0.7),
                0 0 0 1px rgba(255, 255, 255, 0.6) inset;
    filter: brightness(1.06);
}

/* 6. ПРЕСЕТ: FLOATING PILL (Капсула с текстом «Наверх») */
.scroll-top--floating-pill,
[data-scroll-top="btn"][data-style="floating-pill"] {
    width: auto;
    min-width: 105px;
    height: 42px;
    padding: 0 16px;
    border-radius: 9999px;
    gap: 8px;
    background: var(--portal-accent, #6366f1);
    color: #ffffff;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.2px;
    box-shadow: 0 4px 18px rgba(99, 102, 241, 0.38),
                0 0 0 1px rgba(255, 255, 255, 0.2) inset;
}
.scroll-top--floating-pill .scroll-top-label,
[data-scroll-top="btn"][data-style="floating-pill"] [data-scroll-top="label"],
[data-scroll-top="label"] {
    display: inline-block;
    line-height: 1;
}
.scroll-top--floating-pill:hover,
[data-scroll-top="btn"][data-style="floating-pill"]:hover {
    box-shadow: 0 8px 24px var(--portal-accent-glow, rgba(99, 102, 241, 0.55));
    filter: brightness(1.08);
}

/* МОБИЛЬНАЯ АДАПТАЦИЯ */
@media (max-width: 480px) {
    .scroll-top--hide-mobile {
        display: none !important;
    }
    .scroll-to-top,
    [data-scroll-top="btn"] {
        bottom: 20px;
        right: 20px;
        width: 44px;
        height: 44px;
    }
    .scroll-top--floating-pill,
    [data-scroll-top="btn"][data-style="floating-pill"] {
        min-width: 95px;
        height: 38px;
        padding: 0 12px;
        font-size: 12px;
    }
}