.structure-box {
    margin: 18px 0;
    padding: 16px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: #fafbf9;
}

.structure-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 13px;
}

.structure-head small {
    color: var(--ink);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .06em;
}

.structure-head span {
    color: var(--muted);
    font-size: 10px;
}

.structure-list {
    display: grid;
    gap: 9px;
}

.structure-item {
    display: grid;
    grid-template-columns: 44px 1fr;
    gap: 10px;
    align-items: start;
}

.structure-role {
    padding: 4px 5px;
    border-radius: 6px;
    background: #e8f2ec;
    color: #246045;
    font-size: 10px;
    font-weight: 700;
    text-align: center;
}

.role-谓语 {
    background: #edf0f7;
    color: #455a85;
}

.role-宾语,
.role-表语 {
    background: #f7eee7;
    color: #925737;
}

.role-状语 {
    background: #f4f0df;
    color: #7c6b28;
}

.structure-item b {
    display: block;
    color: var(--ink);
    font-family: Georgia, serif;
    font-size: 13px;
    font-weight: 500;
    line-height: 1.35;
}

.structure-item small {
    display: block;
    margin-top: 2px;
    color: var(--muted);
    font-size: 9px;
}

.structure-note {
    margin: 12px 0 0;
    padding-top: 10px;
    border-top: 1px dashed var(--line);
    color: var(--muted);
    font-size: 9px;
    line-height: 1.5;
}

body.dark .structure-box {
    background: #181b19;
}