.mathpedia-learning-button {
    appearance: none;
    border: 1px solid #1f6feb;
    border-radius: 6px;
    background: #1f6feb;
    color: #fff;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 0 16px;
    font-weight: 700;
    line-height: 1.2;
    transition: background-color 0.15s ease, border-color 0.15s ease, opacity 0.15s ease;
}

.mathpedia-learning-button:hover,
.mathpedia-learning-button:focus {
    background: #1857b6;
    border-color: #1857b6;
    color: #fff;
}

.mathpedia-learning-button:disabled {
    cursor: wait;
    opacity: 0.7;
}

.mathpedia-learning-button.is-completed {
    background: #147d4f;
    border-color: #147d4f;
}

.mathpedia-login-notice,
.mathpedia-empty-state {
    border: 1px solid #d7dde5;
    border-radius: 6px;
    background: #f8fafc;
    padding: 14px 16px;
}

.mathpedia-mypage {
    display: grid;
    gap: 22px;
}

.mathpedia-stats {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.mathpedia-stat {
    border: 1px solid #d7dde5;
    border-radius: 6px;
    background: #fff;
    padding: 18px;
}

.mathpedia-stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    line-height: 1;
}

.mathpedia-stat-label {
    display: block;
    margin-top: 8px;
    color: #536171;
    font-size: 0.95rem;
}

.mathpedia-review-list {
    display: grid;
    gap: 12px;
}

.mathpedia-review-card {
    border: 1px solid #d7dde5;
    border-radius: 6px;
    background: #fff;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 16px;
}

.mathpedia-review-card h3 {
    margin: 0 0 6px;
    font-size: 1.05rem;
}

.mathpedia-review-card p {
    margin: 0;
    color: #536171;
    font-size: 0.92rem;
}

@media (max-width: 640px) {
    .mathpedia-stats {
        grid-template-columns: 1fr;
    }

    .mathpedia-review-card {
        align-items: stretch;
        flex-direction: column;
    }

    .mathpedia-review-card .mathpedia-learning-button {
        width: 100%;
    }
}