/* =============================================
   Scroll To Top - Valento
   Círculo blanco con anillo de progreso y % de
   lectura. Al pasar el cursor muestra la flecha.
   ============================================= */

.lv-scrolltop {
    --st-size: 60px;
    --st-ink: #1e1e1e;
    --st-track: #ececec;
    --st-gold: #C4A35A;

    position: fixed;
    right: 26px;
    bottom: 30px;
    z-index: 9997;
    width: var(--st-size);
    height: var(--st-size);
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--st-ink);
    background: #fff;
    border: 0;
    border-radius: 50%;
    box-shadow: 0 6px 22px rgba(0, 0, 0, .12);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(14px) scale(.9);
    transition: opacity .35s ease, transform .35s ease, box-shadow .3s ease, visibility .35s;
}
.lv-scrolltop.visible {
    opacity: 1;
    visibility: visible;
    transform: none;
}
.lv-scrolltop:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 28px rgba(0, 0, 0, .16);
}
.lv-scrolltop:focus-visible {
    outline: 2px solid var(--st-gold);
    outline-offset: 3px;
}

/* Anillo de progreso (pathLength=100 → dashoffset = 100 - %) */
.lv-scrolltop__ring {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}
.lv-scrolltop__ring circle {
    fill: none;
    stroke-width: 2.5;
}
.lv-scrolltop__track { stroke: var(--st-track); }
.lv-scrolltop__bar {
    stroke: var(--st-ink);
    stroke-linecap: round;
    stroke-dasharray: 100;
    stroke-dashoffset: 100;
    transition: stroke .3s ease;
}
.lv-scrolltop:hover .lv-scrolltop__bar { stroke: var(--st-gold); }

/* Porcentaje ↔ flecha */
.lv-scrolltop__pct,
.lv-scrolltop__arrow {
    position: absolute;
    transition: opacity .25s ease, transform .25s ease;
}
.lv-scrolltop__pct {
    font-family: 'Montserrat', sans-serif;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: -.2px;
    font-variant-numeric: tabular-nums;
    line-height: 1;
}
.lv-scrolltop__arrow {
    font-size: 18px;
    color: var(--st-gold);
    opacity: 0;
    transform: translateY(6px);
}
.lv-scrolltop:hover .lv-scrolltop__pct,
.lv-scrolltop:focus-visible .lv-scrolltop__pct { opacity: 0; transform: translateY(-6px); }
.lv-scrolltop:hover .lv-scrolltop__arrow,
.lv-scrolltop:focus-visible .lv-scrolltop__arrow { opacity: 1; transform: none; }

/* Al llegar al final, la flecha reemplaza al 100% */
.lv-scrolltop.is-end .lv-scrolltop__pct { opacity: 0; }
.lv-scrolltop.is-end .lv-scrolltop__arrow { opacity: 1; transform: none; }

@media (max-width: 767px) {
    .lv-scrolltop { --st-size: 50px; right: 16px; bottom: 20px; }
    .lv-scrolltop__pct { font-size: 12px; }
    .lv-scrolltop__arrow { font-size: 16px; }
}

@media (prefers-reduced-motion: reduce) {
    .lv-scrolltop,
    .lv-scrolltop__pct,
    .lv-scrolltop__arrow,
    .lv-scrolltop__bar { transition: none; }
}