/* Targeted visual treatment for the parity train activity only. */
.classificationActivity-parityTrain {
    max-width: 900px;
    position: relative;
    overflow: hidden;
    border-radius: 24px;
    padding: 24px 18px 30px;
    background: linear-gradient(180deg, #f0f9ff 0%, #ffffff 56%, #fef3c7 100%);
    border: 2px solid #bae6fd;
    box-shadow: 0 12px 30px rgba(14, 116, 144, .12);
}
.classificationActivity-parityTrain h1 {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    color: #075985;
    font-size: clamp(1.35rem, 4vw, 2rem);
}
.classificationActivity-parityTrain h1::before {
    content: "🚂";
    font-size: 1.45em;
}
.classificationActivity-parityTrain .classificationInstruction {
    color: #334155;
    font-weight: 600;
}
.classificationActivity-parityTrain .classificationStatus {
    display: inline-block;
    padding: 7px 15px;
    border-radius: 999px;
    background: #dbeafe;
    color: #1e40af;
}
.classificationActivity-parityTrain .classificationItems {
    padding: 14px;
    border: 2px dashed #fbbf24;
    border-radius: 18px;
    background: rgba(255,255,255,.78);
}
.classificationActivity-parityTrain .classificationItem {
    border: 2px solid #cbd5e1;
    border-bottom-width: 4px;
    border-radius: 12px 12px 8px 8px;
    background: #fff;
    color: #0f172a;
    font-size: 1.35rem;
    font-weight: 800;
    transition: transform .15s ease, border-color .15s ease;
}
.classificationActivity-parityTrain .classificationItem:active {
    transform: translateY(2px);
}
.classificationActivity-parityTrain .classificationDropZones {
    position: relative;
    padding-bottom: 22px;
}
.classificationActivity-parityTrain .classificationDropZones::after {
    content: "";
    position: absolute;
    z-index: 0;
    right: 2%;
    left: 2%;
    bottom: 7px;
    height: 5px;
    border-radius: 5px;
    background: repeating-linear-gradient(90deg, #64748b 0 22px, transparent 22px 31px);
    pointer-events: none;
}
.classificationActivity-parityTrain .classificationDropZone {
    position: relative;
    z-index: 1;
    min-height: 170px;
    margin-bottom: 12px;
    border: 3px solid #0284c7;
    border-bottom: 7px solid #0369a1;
    border-radius: 18px 18px 12px 12px;
    background: linear-gradient(180deg, #e0f2fe, #bae6fd);
    box-shadow: inset 0 5px 0 rgba(255,255,255,.7);
}
.classificationActivity-parityTrain .classificationDropZone:nth-child(2) {
    border-color: #d97706;
    border-bottom-color: #b45309;
    background: linear-gradient(180deg, #fef3c7, #fde68a);
}
.classificationActivity-parityTrain .classificationDropZone::before,
.classificationActivity-parityTrain .classificationDropZone::after {
    content: "";
    position: absolute;
    bottom: -18px;
    width: 22px;
    height: 22px;
    border: 4px solid #475569;
    border-radius: 50%;
    background: #cbd5e1;
    box-shadow: inset 0 0 0 4px #f8fafc;
    pointer-events: none;
}
.classificationActivity-parityTrain .classificationDropZone::before { right: 18%; }
.classificationActivity-parityTrain .classificationDropZone::after { left: 18%; }
.classificationActivity-parityTrain .classificationDropZoneTitle {
    position: relative;
    z-index: 1;
    margin: 0 -3px 12px;
    padding: 9px 6px;
    border-radius: 10px;
    background: rgba(255,255,255,.72);
    color: #0c4a6e;
    font-weight: 800;
}
.classificationActivity-parityTrain .classificationDropZone:nth-child(2) .classificationDropZoneTitle {
    color: #92400e;
}
.classificationActivity-parityTrain .classificationDropZoneItems {
    position: relative;
    z-index: 1;
    grid-template-columns: repeat(auto-fit, minmax(42px, 1fr));
}
.classificationActivity-parityTrain .classificationPlacedItem {
    border: 1px solid rgba(15,23,42,.12);
    border-radius: 8px;
    background: rgba(255,255,255,.94);
    color: #0f172a;
    font-size: 1.1rem;
    font-weight: 800;
}
.classificationActivity-parityTrain .classificationBackBtn {
    border: 1px solid #cbd5e1;
    background: #fff;
}

/* This activity has only ten number cards: keep its card and wagon contents
   in natural flow instead of inheriting inner scroll areas from shared CSS. */
.classificationActivity-parityTrain .classificationItems,
.classificationActivity-parityTrain .classificationDropZones,
.classificationActivity-parityTrain .classificationDropZone,
.classificationActivity-parityTrain .classificationDropZoneItems {
    height: auto;
    max-height: none;
    overflow: visible;
}

@media (max-width: 600px) {
    .classificationActivity-parityTrain {
        padding: 16px 10px 26px;
        border-radius: 18px;
    }
    .classificationActivity-parityTrain .classificationItems {
        padding: 9px;
        gap: 7px;
    }
    .classificationActivity-parityTrain .classificationDropZone {
        min-height: 130px;
        padding: 8px;
    }
    .classificationActivity-parityTrain .classificationDropZone::before,
    .classificationActivity-parityTrain .classificationDropZone::after {
        width: 17px;
        height: 17px;
        bottom: -15px;
    }
    .classificationActivity-parityTrain .classificationDropZoneTitle {
        font-size: .88rem;
    }
}


/* Compact parity-train cards so the activity needs less vertical scrolling. */
.classificationActivity-parityTrain .classificationItems {
    grid-template-columns: repeat(5, minmax(0, 1fr));
}
.classificationActivity-parityTrain .classificationItems .classificationItem {
    min-width: 0;
    min-height: 48px;
    padding: 8px 5px;
    font-size: 1.1rem;
}
.classificationActivity-parityTrain .classificationDropZoneItems {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}
.classificationActivity-parityTrain .classificationPlacedItem {
    min-width: 0;
    padding: 6px 3px;
    overflow-wrap: anywhere;
}
@media (max-width: 600px) {
    .classificationActivity-parityTrain .classificationItems {
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 6px;
    }
    .classificationActivity-parityTrain .classificationItems .classificationItem {
        min-height: 44px;
        padding: 7px 3px;
        font-size: 1rem;
    }
    .classificationActivity-parityTrain .classificationDropZoneItems {
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 5px;
    }
}