/* -----------------------------------------------------------------------------
 * Tooltip base rules (Popover + Anchor Positioning)
 *
 * 使い方（共通）:
 * 1) トリガー要素に `.UI_TooltipTrigger`
 * 2) ツールチップ要素に `.UI_TooltipPopover` + `popover="auto"`
 * 3) トリガーの `popovertarget` とツールチップ要素の `id` を対応付ける
 *
 * 紐付け方式:
 * - 静的: PHP helper が button / tooltip のセットを出力する
 * - 動的: JS utility が `id` / `popovertarget` / anchor を行単位で設定する
 * --------------------------------------------------------------------------- */

.UI_TooltipTrigger {
    cursor: pointer;
    border: none;
    background: transparent;
    color: #6b7280;
    padding: 0;
    margin: 0;
    line-height: 1;
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.UI_TooltipTrigger:hover {
    color: #374151;
}

.UI_TooltipTrigger:focus-visible {
    outline: 2px solid var(--SubPrimaryColor);
    outline-offset: 2px;
}

.UI_TooltipPopover {
    margin: 0px 5px 0px 5px;
    border: 1px solid #d1d5db;
    border-radius: 10px;
    padding: 8px 10px;
    background-color: #fff;
    color: #374151;
    font-size: 12px;
    line-height: 1.5;
    text-align: start;
    max-inline-size: min(320px, calc(100vw - 24px));
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.18);
    z-index: 10000;
}

.UI_TooltipPopover::backdrop {
    background: transparent;
}

@supports (position-anchor: --tooltip-anchor) and (top: anchor(bottom)) {
    .UI_TooltipPopover {
        position: fixed;
        inset: auto;
        /* まず上側表示を試し、見切れる場合は fallback で自動退避する */
        position-area: block-start;
        position-try-fallbacks: flip-block, flip-inline;
        position-visibility: anchors-visible;
        bottom: calc(anchor(top) + 8px);
        left: anchor(left);
    }
}

.UI_TooltipPopover {
    opacity: 0;
    transform: translateY(4px) scale(0.98);
    transition:
        opacity 120ms ease,
        transform 120ms ease;
}

.UI_TooltipPopover:popover-open {
    opacity: 1;
    transform: translateY(0) scale(1);
}

@starting-style {
    .UI_TooltipPopover:popover-open {
        opacity: 0;
        transform: translateY(4px) scale(0.98);
    }
}

@media (prefers-reduced-motion: reduce) {
    .UI_TooltipPopover {
        transition: none;
    }
}