.wa-usage-page {
  --wa-blue: #1877f2;
  --wa-text: #1c1e21;
  --wa-muted: #65676b;
  --wa-border: #e4e6eb;
  --wa-card: #fff;
  --wa-bg: #f0f2f5;
  color: var(--wa-text);
}

.wa-usage-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.wa-usage-head h1 {
  margin: 0;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.wa-usage-filters {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: flex-end;
}

.wa-usage-chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.wa-usage-chip {
  border: 1px solid var(--wa-border);
  background: #fff;
  color: var(--wa-text);
  border-radius: 999px;
  padding: 8px 14px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}

.wa-usage-chip.on {
  background: #e7f3ff;
  border-color: #bcd9ff;
  color: var(--wa-blue);
}

.wa-usage-custom {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.wa-usage-custom.hidden {
  display: none;
}

.wa-usage-custom input[type="date"] {
  border: 1px solid var(--wa-border);
  border-radius: 8px;
  padding: 8px 10px;
  background: #fff;
}

.wa-usage-note,
.wa-usage-range {
  color: var(--wa-muted);
  font-size: 13px;
  margin: 6px 0 14px;
}

.wa-usage-cards,
.wa-usage-charts {
  display: grid;
  grid-template-columns: repeat(5, minmax(180px, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.wa-usage-charts {
  grid-template-columns: repeat(3, minmax(220px, 1fr));
}

.wa-usage-card {
  background: var(--wa-card);
  border: 1px solid var(--wa-border);
  border-radius: 12px;
  padding: 14px 16px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.wa-usage-card.accent {
  outline: 1px solid #dbeafe;
}

.wa-usage-card h3 {
  margin: 0 0 12px;
  font-size: 15px;
  font-weight: 700;
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: baseline;
}

.wa-usage-card h3 span {
  font-size: 12px;
  font-weight: 600;
  color: var(--wa-muted);
  white-space: nowrap;
}

.wa-usage-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 6px 0;
  font-size: 13px;
  border-top: 1px solid #f0f2f5;
}

.wa-usage-row:first-of-type {
  border-top: 0;
}

.wa-usage-row span {
  color: var(--wa-muted);
}

.wa-usage-row strong {
  font-weight: 700;
  color: var(--wa-text);
}

.wa-usage-row.total strong {
  color: var(--wa-blue);
}

.wa-usage-divider {
  height: 1px;
  background: var(--wa-border);
  margin: 8px 0;
}

.wa-usage-chart {
  margin-top: 8px;
}

.wa-usage-chart.empty {
  color: var(--wa-muted);
  font-size: 13px;
  padding: 24px 0;
}

.wa-usage-chart svg {
  width: 100%;
  height: 140px;
  display: block;
  background: linear-gradient(180deg, #f8fafc 0%, #fff 100%);
  border-radius: 8px;
}

.wa-usage-chart-x {
  display: flex;
  justify-content: space-between;
  gap: 4px;
  margin-top: 6px;
  color: var(--wa-muted);
  font-size: 11px;
}

@media (max-width: 1200px) {
  .wa-usage-cards {
    grid-template-columns: repeat(2, minmax(220px, 1fr));
  }
  .wa-usage-charts {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .wa-usage-cards {
    grid-template-columns: 1fr;
  }
  .wa-usage-filters {
    align-items: stretch;
  }
}