.solution-meta {
    color: #a9b1d6;
    font-size: 0.95rem;
    margin-bottom: 1rem;
}
.solution-card {
    background: rgba(26, 27, 38, 0.6);
    border: 1px solid #414868;
    padding: 16px;
    border-radius: 8px;
}
.solution-card h2 {
    margin-top: 0;
    border-bottom: 1px solid #7dcfff;
    padding-bottom: 6px;
}
.solution-section {
    margin-top: 1rem;
}
.solution-section-title {
    color: #7aa2f7;
    margin-bottom: 0.25rem;
}
.math-block {
    display: block;
    padding: 10px 12px;
    margin: 0.5rem 0 0;
    background: #1a1b26;
    border-left: 3px solid #7dcfff;
}

.problem-entry {
    margin-bottom: 1.25rem;
    padding: 14px 16px;
    background: rgba(26, 27, 38, 0.6);
    border: 1px solid #414868;
    border-radius: 8px;
}
.problem-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 0.5rem;
}
.problem-date {
    color: #7dcfff;
    font-weight: 700;
    letter-spacing: 0.02em;
}
.problem-statement {
    background: #1a1b26;
    border-left: 3px solid #7dcfff;
    padding: 10px 12px;
    white-space: pre-wrap;
}
.problem-actions {
    margin-top: 0.5rem;
}
.problem-hint {
    margin-top: 0.75rem;
}
.problem-hint summary {
    cursor: pointer;
    color: #73daca;
    font-weight: 600;
}
.problem-hint div {
    margin-top: 0.5rem;
    padding: 10px 12px;
    background: #1a1b26;
    border-left: 3px solid #9d7cd8;
    white-space: pre-wrap;
}