/* ===== 3D graph backdrop (components/graph_background.html) ===== */

.graph-bg {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    opacity: 0;
    /* Fully blurred, so the backdrop reads as soft drifting light rather than a diagram.
       Blur radius scales a little with the screen so phones and big monitors look alike. */
    filter: blur(clamp(10px, 1.4vw, 22px)) saturate(1.15);
    transform: scale(1.06);  /* hides the faded edge the blur leaves at the viewport border */
    transition: opacity 1.2s ease, background-color 0.4s ease, filter 0.5s ease, transform 0.5s ease;
}
.graph-bg #graph-container {
    width: 100%;
    height: 100%;
}

/* Fade in once the libraries have loaded. Blurring spreads the light out, so it can be a bit
   stronger than a sharp graph would be without hurting readability. */
.graph-bg-ready .graph-bg { opacity: var(--graph-bg-opacity, 0.75); }
:root[data-theme="light"] { --graph-bg-opacity: 0.9; }
@media (prefers-color-scheme: light) {
    :root:not([data-theme]) { --graph-bg-opacity: 0.9; }
}

/* Page content sits above the backdrop */
.content,
.landing-container { position: relative; z-index: 1; }

/* ----- Explore mode: the graph comes to the front ----- */
.graph-exploring .graph-bg {
    opacity: 1;
    z-index: 50;
    pointer-events: auto;
    background: var(--graph-bg);
    filter: none;      /* sharp and readable while exploring */
    transform: none;
}
.graph-exploring .graph-bg #graph-container { cursor: grab; }
.graph-exploring .graph-bg #graph-container:active { cursor: grabbing; }
.graph-exploring body { overflow: hidden; }
.graph-exploring .content,
.graph-exploring .landing-container {
    opacity: 0;
    visibility: hidden;
}
.content,
.landing-container { transition: opacity 0.35s ease, visibility 0.35s; }

/* The bar sits on the dark graph in both themes, so it uses fixed colours */
.graph-explore-bar {
    display: none;
    position: fixed;
    left: 50%;
    bottom: 28px;
    transform: translateX(-50%);
    z-index: 60;
    align-items: center;
    gap: 16px;
    padding: 8px 8px 8px 18px;
    border-radius: 999px;
    background: rgba(26, 31, 37, 0.92);
    border: 1px solid #2B323B;
    backdrop-filter: blur(10px);
    color: #95A0AC;
    font: 0.75rem 'Inter', sans-serif;
    white-space: nowrap;
}
.graph-exploring .graph-explore-bar { display: flex; }
.graph-explore-close {
    border: 0;
    border-radius: 999px;
    padding: 8px 16px;
    background: #B5E655;
    color: #111418;
    font: 700 0.75rem 'Inter', sans-serif;
    letter-spacing: 1px;
    text-transform: uppercase;
    cursor: pointer;
}
.graph-explore-close:hover { filter: brightness(1.08); }

@media (max-width: 600px) {
    .graph-explore-hint { display: none; }
    .graph-explore-bar { padding: 6px; }
}