/*
 * The buttons over the corner of a pane's content (split_controls.js: sound, fit, fullscreen, ×, dock, and the owner's own). Used by the
 * split pane, the floating window and any page that mounts a video view; nothing here needs the split itself.
 */

/* Buttons over the corner of a pane's content (split_controls.js): `start` at the top left, `end` at the top right. Their
   size is a share of the screen's short side, so it follows the device: 64px at most, about 10% on a phone. */
:root {
    --bt-split-btn-size: clamp(36px, 10vmin, 64px);
}

.bt-split-bar {
    position: absolute;
    top: 8px;
    left: 8px;
    right: 8px;
    z-index: 2;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 8px;
    /* Only the buttons take presses: the content under the bar stays its own. */
    pointer-events: none;
}

.bt-split-bar-group {
    display: flex;
    align-items: flex-start;
    gap: 8px;
}

.bt-split-btn {
    pointer-events: auto;
    display: grid;
    place-items: center;
    width: var(--bt-split-btn-size);
    height: var(--bt-split-btn-size);
    padding: 0;
    border: 0;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.55);
    color: #fff;
    cursor: pointer;
    opacity: 0.75;
    /* The opacity timing is that of `.chrome-autohide` (the idle fade), which this rule would otherwise replace. */
    transition: opacity 0.65s ease, background 0.15s;
}

.bt-split-btn[hidden],
body:not(.bt-split-col) .bt-split-pane-top,
body:not(.bt-split-row) .bt-split-pane-side {
    display: none;
}

.bt-split-btn:disabled {
    opacity: 0.3;
    cursor: default;
}

.bt-split-btn:not(:disabled):hover,
.bt-split-btn:not(:disabled):focus-visible {
    opacity: 1;
    background: rgba(0, 0, 0, 0.8);
}

.bt-split-btn svg {
    width: 62.5%;
    height: 62.5%;
}

@media (prefers-reduced-motion: reduce) {
    .bt-split-btn {
        transition: opacity 0.15s ease, background 0.15s;
    }
}

/* The pane is fullscreen: only the sound and the way out stay of the buttons, and none of the globe half's chrome. */
.bt-split-bar.is-fullscreen .bt-split-fit,
.bt-split-bar.is-fullscreen .bt-split-pane-top,
.bt-split-bar.is-fullscreen .bt-split-pane-side,
.bt-split-bar.is-fullscreen .bt-split-close {
    display: none;
}