/* Анимация скачивания — как calculator-create-kp на /calc/ */

.btn.pilony-download-presentation {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    transition: color .2s ease, background-color .2s ease, box-shadow .2s ease;
    min-height: 44px;
    box-sizing: border-box;
}

.btn.pilony-download-presentation.is-loading {
    cursor: wait;
    pointer-events: none;
}

.btn.pilony-download-presentation .pilony-download-presentation__content {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-width: 0;
    max-width: 100%;
    position: relative;
    z-index: 1;
}

.btn.pilony-download-presentation .pilony-download-presentation__label {
    font-size: 13px;
    line-height: 1.2;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Белая кнопка в hero */
.btn_white.pilony-download-presentation.is-loading {
    color: #fff;
    background: linear-gradient(
        110deg,
        rgba(255, 255, 255, 0.04) 0%,
        rgba(255, 255, 255, 0.12) 50%,
        rgba(255, 255, 255, 0.04) 100%
    );
    background-size: 220% 100%;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.35);
    animation:
        pilony-download-bg 1.8s ease-in-out infinite,
        pilony-download-glow-white 1.4s ease-in-out infinite;
}

.btn_white.pilony-download-presentation.is-loading::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.16) 50%,
        transparent 100%
    );
    transform: translateX(-120%);
    animation: pilony-download-sweep 1.6s ease-in-out infinite;
    pointer-events: none;
}

.btn_white.pilony-download-presentation .pilony-download-presentation__spinner {
    width: 14px;
    height: 14px;
    flex: 0 0 14px;
    border: 2px solid rgba(255, 255, 255, 0.28);
    border-top-color: #fff;
    border-radius: 50%;
    animation: pilony-download-spin .75s linear infinite;
}

/* Красная кнопка в SEO-блоке */
.btn_red.pilony-download-presentation.is-loading {
    color: #fff;
    background: linear-gradient(
        110deg,
        rgba(255, 74, 74, 0.85) 0%,
        rgba(255, 74, 74, 1) 50%,
        rgba(255, 74, 74, 0.85) 100%
    );
    background-size: 220% 100%;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.25);
    animation:
        pilony-download-bg 1.8s ease-in-out infinite,
        pilony-download-glow-red 1.4s ease-in-out infinite;
}

.btn_red.pilony-download-presentation.is-loading::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.18) 50%,
        transparent 100%
    );
    transform: translateX(-120%);
    animation: pilony-download-sweep 1.6s ease-in-out infinite;
    pointer-events: none;
}

.btn_red.pilony-download-presentation .pilony-download-presentation__spinner {
    width: 14px;
    height: 14px;
    flex: 0 0 14px;
    border: 2px solid rgba(255, 255, 255, 0.35);
    border-top-color: #fff;
    border-radius: 50%;
    animation: pilony-download-spin .75s linear infinite;
}

@keyframes pilony-download-spin {
    to { transform: rotate(360deg); }
}

@keyframes pilony-download-bg {
    0%, 100% { background-position: 100% 50%; }
    50% { background-position: 0% 50%; }
}

@keyframes pilony-download-sweep {
    0% { transform: translateX(-120%); }
    100% { transform: translateX(120%); }
}

@keyframes pilony-download-glow-white {
    0%, 100% { box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.3); }
    50% { box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.55); }
}

@keyframes pilony-download-glow-red {
    0%, 100% { box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.2); }
    50% { box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.45); }
}