.sandhi-sprint-hero {
    background:
        radial-gradient(circle at 90% 15%, rgba(255, 255, 255, .2), transparent 28%),
        linear-gradient(135deg, #312e81 0%, #6d28d9 48%, #0f766e 100%);
}

.sandhi-hero-pair {
    display: inline-flex;
    align-items: center;
    align-self: flex-start;
    gap: .65rem;
    border: 1px solid rgba(255, 255, 255, .45);
    border-radius: 999px;
    padding: .55rem .85rem;
    font-size: 1.05rem;
    font-weight: 800;
    background: rgba(255, 255, 255, .12);
    white-space: nowrap;
}

.sandhi-game-card {
    position: relative;
    overflow: hidden;
}

.sandhi-band-grid {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: .6rem;
}

.sandhi-band {
    border: 1px solid var(--bs-border-color);
    border-radius: .8rem;
    padding: .75rem .45rem;
    color: var(--bs-body-color);
    background: var(--bs-body-bg);
    transition: transform .15s ease, border-color .15s ease, box-shadow .15s ease;
}

.sandhi-band:hover,
.sandhi-band:focus-visible {
    transform: translateY(-2px);
    border-color: var(--bs-primary);
}

.sandhi-band.active {
    border-color: var(--bs-primary);
    box-shadow: 0 0 0 3px rgba(var(--bs-primary-rgb), .14);
    background: var(--bs-primary-bg-subtle);
}

.sandhi-band strong,
.sandhi-band span {
    display: block;
}

.sandhi-band span {
    margin-top: .2rem;
    font-size: .76rem;
    color: var(--bs-secondary-color);
}

.sandhi-word-stage {
    position: relative;
    border: 1px solid var(--bs-border-color);
    border-radius: 1rem;
    padding: 1.25rem 1rem;
    background:
        linear-gradient(135deg, rgba(var(--bs-primary-rgb), .08), rgba(15, 118, 110, .08));
}

.sandhi-audio-orbit {
    display: inline-grid;
    place-items: center;
    width: 2.8rem;
    height: 2.8rem;
    margin-bottom: .35rem;
    border-radius: 50%;
    color: #fff;
    background: linear-gradient(135deg, #6d28d9, #0f766e);
    box-shadow: 0 0 0 0 rgba(109, 40, 217, .35);
}

.sandhi-word-stage.is-playing .sandhi-audio-orbit {
    animation: sandhiPulse 1.15s ease-out infinite;
}

.sandhi-word {
    font-size: clamp(2.7rem, 9vw, 4.4rem);
    line-height: 1.05;
    font-weight: 800;
    letter-spacing: .08em;
}

.sandhi-citation {
    margin-top: .45rem;
    color: var(--bs-secondary-color);
}

.sandhi-options {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: .7rem;
}

.sandhi-option {
    position: relative;
    border: 2px solid var(--bs-border-color);
    border-radius: .85rem;
    min-height: 4.2rem;
    background: var(--bs-body-bg);
    color: var(--bs-body-color);
    font-size: 1.25rem;
    font-weight: 800;
    transition: transform .12s ease, border-color .12s ease, background-color .12s ease;
}

.sandhi-option:hover:not(:disabled),
.sandhi-option:focus-visible:not(:disabled) {
    transform: translateY(-2px);
    border-color: var(--bs-primary);
}

.sandhi-option .sandhi-key {
    position: absolute;
    top: .3rem;
    left: .45rem;
    font-size: .68rem;
    font-weight: 600;
    color: var(--bs-secondary-color);
}

.sandhi-option.is-correct {
    border-color: var(--bs-success);
    color: var(--bs-success-text-emphasis);
    background: var(--bs-success-bg-subtle);
    animation: sandhiPop .25s ease-out;
}

.sandhi-option.is-wrong {
    border-color: var(--bs-danger);
    color: var(--bs-danger-text-emphasis);
    background: var(--bs-danger-bg-subtle);
    animation: sandhiShake .25s ease-out;
}

.sandhi-option.is-citation::after {
    content: "written";
    position: absolute;
    right: .35rem;
    bottom: .25rem;
    border-radius: 999px;
    padding: .08rem .35rem;
    background: var(--bs-tertiary-bg);
    color: var(--bs-secondary-color);
    font-size: .62rem;
    font-weight: 600;
}

.sandhi-reading-compare {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: .5rem;
}

.sandhi-pattern-review {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: .45rem;
}

.sandhi-review-chip {
    border-radius: 999px;
    padding: .35rem .65rem;
    color: var(--bs-danger-text-emphasis);
    background: var(--bs-danger-bg-subtle);
    font-size: .85rem;
}

.sandhi-result-burst {
    color: #f59e0b;
    font-size: 2.5rem;
    animation: sandhiSpin .6s ease-out;
}

.sandhi-particles {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.sandhi-particle {
    position: absolute;
    width: .5rem;
    height: .5rem;
    border-radius: 50%;
    animation: sandhiBurst .65s ease-out forwards;
}

@keyframes sandhiPulse {
    0% { box-shadow: 0 0 0 0 rgba(109, 40, 217, .35); }
    100% { box-shadow: 0 0 0 18px rgba(109, 40, 217, 0); }
}

@keyframes sandhiPop {
    50% { transform: scale(1.05); }
}

@keyframes sandhiShake {
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

@keyframes sandhiSpin {
    from { transform: scale(.4) rotate(-100deg); opacity: 0; }
    to { transform: scale(1) rotate(0); opacity: 1; }
}

@keyframes sandhiBurst {
    from { transform: translate(0, 0) scale(1); opacity: 1; }
    to { transform: translate(var(--ss-x), var(--ss-y)) scale(.2); opacity: 0; }
}

@media (max-width: 767.98px) {
    .sandhi-band-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .sandhi-band:last-child {
        grid-column: 1 / -1;
    }

    .sandhi-options {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (prefers-reduced-motion: reduce) {
    .sandhi-word-stage.is-playing .sandhi-audio-orbit,
    .sandhi-option,
    .sandhi-result-burst,
    .sandhi-particle {
        animation: none !important;
        transition: none !important;
    }
}