/* 사용량 리포트 */
.usage-grid {
    display: grid; grid-template-columns: repeat(4, 1fr);
    gap: 16px; margin-top: 24px;
}
.usage-card {
    padding: 24px; text-align: center;
    transition: transform var(--transition);
}
.usage-card:hover { transform: translateY(-2px); }
.usage-icon { font-size: 28px; margin-bottom: 8px; }
.usage-val { font-size: 28px; font-weight: 700; color: var(--text); }
.usage-val small { font-size: 14px; font-weight: 400; color: var(--text-muted); margin-left: 2px; }
.usage-label { font-size: 13px; color: var(--text-light); margin-top: 4px; }
.usage-note { font-size: 11px; color: var(--text-muted); margin-top: 4px; }
.usage-warn { border-left: 3px solid var(--error); }
@media (max-width: 768px) {
    .usage-grid { grid-template-columns: repeat(2, 1fr); }
}