.fraction-page {
    padding-bottom: 4rem;
}

.fraction-hero {
    padding: 1.5rem 0 0;
}

.fraction-hero-inner {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

.fraction-copy p {
    max-width: 62ch;
    color: var(--muted);
}

.fraction-sheet-wrap {
    margin-top: 1.5rem;
}

.fraction-sheet {
    position: relative;
    padding: 2rem;
    border: 4px solid #1a1a1a;
    border-radius: 26px;
    background:
        radial-gradient(circle at top left, rgba(0, 0, 0, 0.08) 0 2px, transparent 3px 100%),
        radial-gradient(circle at top right, rgba(0, 0, 0, 0.08) 0 2px, transparent 3px 100%),
        #fffdf8;
    box-shadow: 0 18px 40px rgba(23, 38, 60, 0.08);
}

.fraction-sheet::before {
    content: '';
    position: absolute;
    inset: -22px;
    border: 4px solid #1a1a1a;
    border-radius: 34px;
    pointer-events: none;
    opacity: 0.12;
}

.fraction-header {
    margin-bottom: 1.5rem;
}

.fraction-header h2 {
    margin-bottom: 0.55rem;
    font-size: clamp(2rem, 4vw, 3rem);
    font-family: "Trebuchet MS", "Comic Sans MS", Arial, sans-serif;
}

.fraction-header p {
    margin: 0;
    font-size: 1.1rem;
    color: #2d2d2d;
}

.fraction-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

.fraction-card {
    display: grid;
    gap: 1rem;
    padding: 1.1rem;
    border: 3px solid #1a1a1a;
    background: rgba(255, 255, 255, 0.94);
}

.fraction-problem {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: center;
    gap: 0.8rem;
}

.fraction-part {
    display: grid;
    justify-items: center;
    gap: 0.7rem;
}

.fraction-model-wrap {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
}

.fraction-model-group {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.55rem;
    width: 100%;
}

.fraction-model {
    width: min(100%, 150px);
    aspect-ratio: 1;
    flex: 0 0 auto;
}

.fraction-readout {
    display: inline-grid;
    justify-items: center;
    gap: 0.15rem;
    min-width: 58px;
    color: #111;
    font-family: "Trebuchet MS", "Comic Sans MS", Arial, sans-serif;
    font-size: 1.7rem;
    font-weight: 900;
    line-height: 1;
}

.fraction-readout span {
    display: block;
}

.fraction-bar {
    width: 100%;
    border-top: 3px solid #111;
}

.fraction-symbol {
    font-family: "Trebuchet MS", "Comic Sans MS", Arial, sans-serif;
    font-size: clamp(2rem, 3vw, 3rem);
    font-weight: 900;
    color: #2a4a74;
}

.fraction-segment {
    fill: #fff;
    stroke: #2a4a74;
    stroke-width: 2.2;
    cursor: pointer;
    transition: fill 0.16s ease, transform 0.16s ease;
}

.fraction-segment:hover {
    transform: translateY(-1px);
}

.fraction-segment.is-filled {
    fill: var(--fill-color, #79aef0);
}

.fraction-segment.is-locked {
    cursor: default;
}

.fraction-stroke {
    fill: none;
    stroke: #2a4a74;
    stroke-width: 2.4;
    pointer-events: none;
}

.fraction-actions {
    display: grid;
    justify-items: center;
    gap: 0.7rem;
}

.fraction-check {
    min-height: 58px;
    min-width: 220px;
}

.fraction-feedback {
    min-height: 24px;
    font-weight: 800;
    font-size: 1rem;
    color: #2f2f2f;
    text-align: center;
}

.fraction-feedback.is-right {
    color: #1e7b42;
}

.fraction-feedback.is-wrong {
    color: #a11f1f;
}

.fraction-card.is-correct {
    border-color: #1e7b42;
    box-shadow: inset 0 0 0 3px rgba(46, 168, 95, 0.16);
}

@media (max-width: 860px) {
    .fraction-problem {
        grid-template-columns: 1fr;
        justify-items: center;
    }

    .fraction-symbol {
        line-height: 1;
    }
}

@media (max-width: 760px) {
    .fraction-sheet {
        padding: 1rem;
    }

    .fraction-sheet::before {
        display: none;
    }

    .fraction-check {
        width: 100%;
        min-width: 0;
    }
}

@media (max-width: 520px) {
    .fraction-header h2 {
        font-size: 2rem;
    }

    .fraction-header p {
        font-size: 1rem;
    }

    .fraction-model {
        width: min(100%, 130px);
    }

    .fraction-model-group {
        gap: 0.4rem;
    }
}