@import '../theme.css';

/**
 * Description:
 * Base class for all 8 resize handles (N, S, E, W, NE, NW, SE, SW).
 * Defines critical properties like absolute positioning, pointer event handling,
 * and default visual states using theme tokens.
 *
 * Dependencies:
 * - ../theme.css (for --resize-handle-*, --color-*)
 */
.resize-handle {
    position: absolute;
    /* CRITICAL: Prevents default browser actions (scrolling, text selection) */
    touch-action: none;
    /* Default visibility and layering */
    background-color: transparent;
    opacity: 0.1;
    z-index: var(--resize-handle-z-index);
    transition: background-color 0.2s ease-in-out;
}

/* Hover/Active states - Consuming theme tokens */
.resize-handle:hover {
    background-color: var(--resize-handle-color-hover);
    opacity: 0.5;
}

.resize-handle:active {
    background-color: var(--resize-handle-color-active);
    opacity: 0.8;
}

/* --- Edge Handles (N, S, E, W) --- */

/* North (Top) Handle */
.resize-handle--n {
    top: 0;
    left: 0;
    width: 100%;
    height: var(--resize-handle-size);
    /* Centers the handle visually over the border */
    /* transform: translateY(calc(-0.5 * var(--resize-handle-size))); */
    cursor: ns-resize;
}

/* South (Bottom) Handle */
.resize-handle--s {
    bottom: 0;
    left: 0;
    width: 100%;
    height: var(--resize-handle-size);
    /* transform: translateY(calc(0.5 * var(--resize-handle-size))); */
    cursor: ns-resize;
}

/* East (Right) Handle */
.resize-handle--e {
    top: 0;
    right: 0;
    height: 100%;
    width: var(--resize-handle-size);
    /* transform: translateX(calc(0.5 * var(--resize-handle-size))); */
    cursor: ew-resize;
}

/* West (Left) Handle */
.resize-handle--w {
    top: 0;
    left: 0;
    height: 100%;
    width: var(--resize-handle-size);
    /* transform: translateX(calc(-0.5 * var(--resize-handle-size))); */
    cursor: ew-resize;
}

/* --- Corner Handles (NE, NW, SE, SW) --- */

/* Northwest (Top-Left) Handle - nwse-resize (top-left to bottom-right diagonal) */
.resize-handle--nw {
    top: 0;
    left: 0;
    width: var(--resize-handle-corner-size);
    height: var(--resize-handle-corner-size);
    /* Offset by half the size to cover both top and left edges */
    /* transform: translate(
        calc(-0.5 * var(--resize-handle-size)),
        calc(-0.5 * var(--resize-handle-size))
    ); */
    cursor: nwse-resize;
}

/* Northeast (Top-Right) Handle - nesw-resize (top-right to bottom-left diagonal) */
.resize-handle--ne {
    top: 0;
    right: 0;
    width: var(--resize-handle-corner-size);
    height: var(--resize-handle-corner-size);
    transform: translate(
        calc(0.5 * var(--resize-handle-size)),
        calc(-0.5 * var(--resize-handle-size))
    );
    cursor: nesw-resize;
}

/* Southeast (Bottom-Right) Handle - nwse-resize (top-left to bottom-right diagonal) */
.resize-handle--se {
    bottom: 0;
    right: 0;
    width: var(--resize-handle-corner-size);
    height: var(--resize-handle-corner-size);
    transform: translate(
        calc(0.5 * var(--resize-handle-size)),
        calc(0.5 * var(--resize-handle-size))
    );
    cursor: nwse-resize;
}

/* Southwest (Bottom-Left) Handle - nesw-resize (top-right to bottom-left diagonal) */
.resize-handle--sw {
    bottom: 0;
    left: 0;
    width: var(--resize-handle-corner-size);
    height: var(--resize-handle-corner-size);
    transform: translate(
        calc(-0.5 * var(--resize-handle-size)),
        calc(0.5 * var(--resize-handle-size))
    );
    cursor: nesw-resize;
}