.dl-stage { font-family: 'Nunito', system-ui, sans-serif; }

/* ---- Framed diagram canvas ---------------------------------------------- */
.dl-diagram {
    position: relative;
    width: min(460px, 100%);
    margin: 4px auto 18px;
    aspect-ratio: 1 / 1;
    background: radial-gradient(circle at 50% 32%, #ffffff 0%, #eef3f9 100%);
    border: 1px solid #dbe3ec;
    border-radius: 20px;
    box-shadow: 0 14px 32px -16px rgba(15, 42, 80, .45), inset 0 1px 0 #fff;
    overflow: hidden;
}
.dl-diagram::after {
    /* soft inner vignette so the artwork sits in a "scene" */
    content: ''; position: absolute; inset: 0; pointer-events: none;
    border-radius: 20px;
    box-shadow: inset 0 0 40px rgba(15, 42, 80, .06);
}
.dl-diagram svg { width: 100%; height: 100%; display: block; }

/* ---- Parts are the drop targets (no covering marker) -------------------- */
.dl-part { cursor: default; transition: filter .12s ease; }
/* a faint halo on unlabelled parts hints they are labelable, without hiding them */
.dl-part:not(.dl-part-filled) { filter: drop-shadow(0 0 1.5px rgba(21, 101, 192, .45)); }
/* glows as a label is dragged onto it */
.dl-part.dl-over { filter: drop-shadow(0 0 6px rgba(21, 101, 192, .95)); }
/* parts outside the lesson's labels subset are plain artwork — no halo */
.dl-part.dl-inactive { filter: none; }
.dl-part.dl-correct { filter: drop-shadow(0 0 6px rgba(22, 163, 74, .9)); }
.dl-part.dl-wrong { filter: drop-shadow(0 0 6px rgba(220, 38, 38, .9)); }

/* ---- Raster image base + anchor targets (hover ring + snap tag) --------- */
.dl-img { width: 100%; height: 100%; object-fit: contain; display: block; }
.dl-anchor {
    position: absolute; transform: translate(-50%, -50%);
    width: 16px; height: 16px; border-radius: 50%;
    background: rgba(21, 101, 192, .22); border: 2px solid rgba(21, 101, 192, .55);
    box-shadow: 0 1px 4px rgba(15, 42, 80, .3);
    pointer-events: none;                 /* matched by nearest-anchor, not hit-test */
    transition: width .12s ease, height .12s ease, border-color .12s ease, background .12s ease, box-shadow .12s ease;
}
/* once a tag sits on it, the dot fades out (the tag carries it) */
.dl-anchor.dl-part-filled { background: transparent; border-color: transparent; box-shadow: none; }
/* glowing ring as a label is dragged near it */
.dl-anchor.dl-over {
    width: 42px; height: 42px;
    background: rgba(21, 101, 192, .12); border: 3px solid #1565c0;
    box-shadow: 0 0 0 5px rgba(21, 101, 192, .15);
}
.dl-anchor.dl-correct { background: rgba(22, 163, 74, .12); border-color: #16a34a; }
.dl-anchor.dl-wrong { background: rgba(220, 38, 38, .12); border-color: #dc2626; }

/* ---- Floating name-tag that snaps to a labelled part ------------------- */
.dl-tag {
    position: absolute;
    transform: translate(-50%, -50%);
    padding: 6px 12px;
    font-family: 'Nunito', sans-serif; font-weight: 800; font-size: 13px; line-height: 1;
    color: #1f2a37; background: #ffffff;
    border: 1.5px solid #cbd5e1; border-radius: 11px;
    box-shadow: 0 5px 14px -5px rgba(15, 42, 80, .5);
    white-space: nowrap; pointer-events: none;
    animation: dl-pop .26s ease;
}
.dl-tag.dl-correct { border-color: #16a34a; background: #f0fdf4; color: #14532d; }
.dl-tag.dl-correct::after {
    content: '\f00c';                      /* fa-check */
    font-family: 'Font Awesome 6 Free'; font-weight: 900; font-size: 11px;
    margin-left: 7px; color: #16a34a;
}
.dl-tag.dl-wrong { border-color: #dc2626; background: #fef2f2; color: #991b1b; animation: dl-shake .4s ease; }

@keyframes dl-pop {
    0%   { transform: translate(-50%, -50%) scale(.55); }
    60%  { transform: translate(-50%, -50%) scale(1.08); }
    100% { transform: translate(-50%, -50%) scale(1); }
}
@keyframes dl-shake {
    0%, 100% { transform: translate(-50%, -50%) translateX(0); }
    20% { transform: translate(-50%, -50%) translateX(-5px); }
    40% { transform: translate(-50%, -50%) translateX(5px); }
    60% { transform: translate(-50%, -50%) translateX(-4px); }
    80% { transform: translate(-50%, -50%) translateX(4px); }
}

/* graceful fallback (no built-in SVG) */
.dl-fallback { padding: 14px; color: #475569; font-size: 14px; }
.dl-fallback ul { margin: 8px 0 0; padding-left: 20px; }
.dl-fallback li { margin: 3px 0; font-weight: 700; }

/* ---- Label chips -------------------------------------------------------- */
.dl-tray-wrap { margin-bottom: 12px; }
.dl-tray-label {
    font-weight: 800; font-size: 12px; color: #64748b; margin-bottom: 7px;
    text-transform: uppercase; letter-spacing: .08em;
}
.dl-tray {
    min-height: 56px; display: flex; flex-wrap: wrap; gap: 10px; padding: 12px;
    background: linear-gradient(180deg, #f1f5f9, #e7eef6);
    border: 1px dashed #cbd5e1; border-radius: 14px;
}

.dl-card {
    display: inline-flex; align-items: center; gap: 8px;
    background: linear-gradient(180deg, #ffffff, #f3f7fb);
    border: 1.5px solid #cbd5e1; border-radius: 999px;
    padding: 8px 16px 8px 13px;
    font-weight: 800; font-size: 14px; color: #1f2a37;
    cursor: grab; user-select: none; touch-action: none;
    box-shadow: 0 2px 6px rgba(15, 42, 80, .14);
    transition: transform .12s ease, box-shadow .12s ease;
}
.dl-card::before {
    content: '\f58e';                      /* fa-grip-vertical */
    font-family: 'Font Awesome 6 Free'; font-weight: 900; font-size: 11px;
    color: #b3bdc9;
}
.dl-card:hover { transform: translateY(-2px); box-shadow: 0 8px 16px -6px rgba(15, 42, 80, .35); }
.dl-card:active { cursor: grabbing; }
.dl-card.dl-dragging { opacity: .35; }

/* ---- Check / callout ---------------------------------------------------- */
.dl-target-panel { display: flex; align-items: center; gap: 14px; }
.dl-callout { font-weight: 800; }
.dl-callout.is-correct { color: #15803d; }
.dl-callout.is-miss { color: #b91c1c; }

.activity-container.display-mode .dl-card { cursor: default; }