diff --git a/ui/src/ui/views/usage-styles/usageStyles-part1.ts b/ui/src/ui/views/usage-styles/usageStyles-part1.ts
new file mode 100644
index 00000000000..ebb62d69717
--- /dev/null
+++ b/ui/src/ui/views/usage-styles/usageStyles-part1.ts
@@ -0,0 +1,701 @@
+export const usageStylesPart1 = `
+  .usage-page-header {
+    margin: 4px 0 12px;
+  }
+  .usage-page-title {
+    font-size: 28px;
+    font-weight: 700;
+    letter-spacing: -0.02em;
+    margin-bottom: 4px;
+  }
+  .usage-page-subtitle {
+    font-size: 13px;
+    color: var(--text-muted);
+    margin: 0 0 12px;
+  }
+  /* ===== FILTERS & HEADER ===== */
+  .usage-filters-inline {
+    display: flex;
+    gap: 8px;
+    align-items: center;
+    flex-wrap: wrap;
+  }
+  .usage-filters-inline select {
+    padding: 6px 10px;
+    border: 1px solid var(--border);
+    border-radius: 6px;
+    background: var(--bg);
+    color: var(--text);
+    font-size: 13px;
+  }
+  .usage-filters-inline input[type="date"] {
+    padding: 6px 10px;
+    border: 1px solid var(--border);
+    border-radius: 6px;
+    background: var(--bg);
+    color: var(--text);
+    font-size: 13px;
+  }
+  .usage-filters-inline input[type="text"] {
+    padding: 6px 10px;
+    border: 1px solid var(--border);
+    border-radius: 6px;
+    background: var(--bg);
+    color: var(--text);
+    font-size: 13px;
+    min-width: 180px;
+  }
+  .usage-filters-inline .btn-sm {
+    padding: 6px 12px;
+    font-size: 14px;
+  }
+  .usage-refresh-indicator {
+    display: inline-flex;
+    align-items: center;
+    gap: 6px;
+    padding: 4px 10px;
+    background: rgba(255, 77, 77, 0.1);
+    border-radius: 4px;
+    font-size: 12px;
+    color: #ff4d4d;
+  }
+  .usage-refresh-indicator::before {
+    content: "";
+    width: 10px;
+    height: 10px;
+    border: 2px solid #ff4d4d;
+    border-top-color: transparent;
+    border-radius: 50%;
+    animation: usage-spin 0.6s linear infinite;
+  }
+  @keyframes usage-spin {
+    to { transform: rotate(360deg); }
+  }
+  .active-filters {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+    flex-wrap: wrap;
+  }
+  .filter-chip {
+    display: flex;
+    align-items: center;
+    gap: 6px;
+    padding: 4px 8px 4px 12px;
+    background: var(--accent-subtle);
+    border: 1px solid var(--accent);
+    border-radius: 16px;
+    font-size: 12px;
+  }
+  .filter-chip-label {
+    color: var(--accent);
+    font-weight: 500;
+  }
+  .filter-chip-remove {
+    background: none;
+    border: none;
+    color: var(--accent);
+    cursor: pointer;
+    padding: 2px 4px;
+    font-size: 14px;
+    line-height: 1;
+    opacity: 0.7;
+    transition: opacity 0.15s;
+  }
+  .filter-chip-remove:hover {
+    opacity: 1;
+  }
+  .filter-clear-btn {
+    padding: 4px 10px !important;
+    font-size: 12px !important;
+    line-height: 1 !important;
+    margin-left: 8px;
+  }
+  .usage-query-bar {
+    display: grid;
+    grid-template-columns: minmax(220px, 1fr) auto;
+    gap: 10px;
+    align-items: center;
+    /* Keep the dropdown filter row from visually touching the query row. */
+    margin-bottom: 10px;
+  }
+  .usage-query-actions {
+    display: flex;
+    align-items: center;
+    gap: 6px;
+    flex-wrap: nowrap;
+    justify-self: end;
+  }
+  .usage-query-actions .btn {
+    height: 34px;
+    padding: 0 14px;
+    border-radius: 999px;
+    font-weight: 600;
+    font-size: 13px;
+    line-height: 1;
+    border: 1px solid var(--border);
+    background: var(--bg-secondary);
+    color: var(--text);
+    box-shadow: none;
+    transition: background 0.15s, border-color 0.15s, color 0.15s;
+  }
+  .usage-query-actions .btn:hover {
+    background: var(--bg);
+    border-color: var(--border-strong);
+  }
+  .usage-action-btn {
+    height: 34px;
+    padding: 0 14px;
+    border-radius: 999px;
+    font-weight: 600;
+    font-size: 13px;
+    line-height: 1;
+    border: 1px solid var(--border);
+    background: var(--bg-secondary);
+    color: var(--text);
+    box-shadow: none;
+    transition: background 0.15s, border-color 0.15s, color 0.15s;
+  }
+  .usage-action-btn:hover {
+    background: var(--bg);
+    border-color: var(--border-strong);
+  }
+  .usage-primary-btn {
+    background: #ff4d4d;
+    color: #fff;
+    border-color: #ff4d4d;
+    box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.12);
+  }
+  .btn.usage-primary-btn {
+    background: #ff4d4d !important;
+    border-color: #ff4d4d !important;
+    color: #fff !important;
+  }
+  .usage-primary-btn:hover {
+    background: #e64545;
+    border-color: #e64545;
+  }
+  .btn.usage-primary-btn:hover {
+    background: #e64545 !important;
+    border-color: #e64545 !important;
+  }
+  .usage-primary-btn:disabled {
+    background: rgba(255, 77, 77, 0.18);
+    border-color: rgba(255, 77, 77, 0.3);
+    color: #ff4d4d;
+    box-shadow: none;
+    cursor: default;
+    opacity: 1;
+  }
+  .usage-primary-btn[disabled] {
+    background: rgba(255, 77, 77, 0.18) !important;
+    border-color: rgba(255, 77, 77, 0.3) !important;
+    color: #ff4d4d !important;
+    opacity: 1 !important;
+  }
+  .usage-secondary-btn {
+    background: var(--bg-secondary);
+    color: var(--text);
+    border-color: var(--border);
+  }
+  .usage-query-input {
+    width: 100%;
+    min-width: 220px;
+    padding: 6px 10px;
+    border: 1px solid var(--border);
+    border-radius: 6px;
+    background: var(--bg);
+    color: var(--text);
+    font-size: 13px;
+  }
+  .usage-query-suggestions {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 6px;
+    margin-top: 6px;
+  }
+  .usage-query-suggestion {
+    padding: 4px 8px;
+    border-radius: 999px;
+    border: 1px solid var(--border);
+    background: var(--bg-secondary);
+    font-size: 11px;
+    color: var(--text);
+    cursor: pointer;
+    transition: background 0.15s;
+  }
+  .usage-query-suggestion:hover {
+    background: var(--bg-hover);
+  }
+  .usage-filter-row {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 8px;
+    align-items: center;
+    margin-top: 14px;
+  }
+  details.usage-filter-select {
+    position: relative;
+    border: 1px solid var(--border);
+    border-radius: 10px;
+    padding: 6px 10px;
+    background: var(--bg);
+    font-size: 12px;
+    min-width: 140px;
+  }
+  details.usage-filter-select summary {
+    cursor: pointer;
+    list-style: none;
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: 6px;
+    font-weight: 500;
+  }
+  details.usage-filter-select summary::-webkit-details-marker {
+    display: none;
+  }
+  .usage-filter-badge {
+    font-size: 11px;
+    color: var(--text-muted);
+  }
+  .usage-filter-popover {
+    position: absolute;
+    left: 0;
+    top: calc(100% + 6px);
+    background: var(--bg);
+    border: 1px solid var(--border);
+    border-radius: 10px;
+    padding: 10px;
+    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
+    min-width: 220px;
+    z-index: 20;
+  }
+  .usage-filter-actions {
+    display: flex;
+    gap: 6px;
+    margin-bottom: 8px;
+  }
+  .usage-filter-actions button {
+    border-radius: 999px;
+    padding: 4px 10px;
+    font-size: 11px;
+  }
+  .usage-filter-options {
+    display: flex;
+    flex-direction: column;
+    gap: 6px;
+    max-height: 200px;
+    overflow: auto;
+  }
+  .usage-filter-option {
+    display: flex;
+    align-items: center;
+    gap: 6px;
+    font-size: 12px;
+  }
+  .usage-query-hint {
+    font-size: 11px;
+    color: var(--text-muted);
+  }
+  .usage-query-chips {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 6px;
+    margin-top: 6px;
+  }
+  .usage-query-chip {
+    display: inline-flex;
+    align-items: center;
+    gap: 6px;
+    padding: 4px 8px;
+    border-radius: 999px;
+    border: 1px solid var(--border);
+    background: var(--bg-secondary);
+    font-size: 11px;
+  }
+  .usage-query-chip button {
+    background: none;
+    border: none;
+    color: var(--text-muted);
+    cursor: pointer;
+    padding: 0;
+    line-height: 1;
+  }
+  .usage-header {
+    display: flex;
+    flex-direction: column;
+    gap: 10px;
+    background: var(--bg);
+  }
+  .usage-header.pinned {
+    position: sticky;
+    top: 12px;
+    z-index: 6;
+    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.06);
+  }
+  .usage-pin-btn {
+    display: inline-flex;
+    align-items: center;
+    gap: 6px;
+    padding: 4px 8px;
+    border-radius: 999px;
+    border: 1px solid var(--border);
+    background: var(--bg-secondary);
+    font-size: 11px;
+    color: var(--text);
+    cursor: pointer;
+  }
+  .usage-pin-btn.active {
+    background: var(--accent-subtle);
+    border-color: var(--accent);
+    color: var(--accent);
+  }
+  .usage-header-row {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: 12px;
+    flex-wrap: wrap;
+  }
+  .usage-header-title {
+    display: flex;
+    align-items: center;
+    gap: 10px;
+  }
+  .usage-header-metrics {
+    display: flex;
+    align-items: center;
+    gap: 12px;
+    flex-wrap: wrap;
+  }
+  .usage-metric-badge {
+    display: inline-flex;
+    align-items: baseline;
+    gap: 6px;
+    padding: 2px 8px;
+    border-radius: 999px;
+    border: 1px solid var(--border);
+    background: transparent;
+    font-size: 11px;
+    color: var(--text-muted);
+  }
+  .usage-metric-badge strong {
+    font-size: 12px;
+    color: var(--text);
+  }
+  .usage-controls {
+    display: flex;
+    align-items: center;
+    gap: 10px;
+    flex-wrap: wrap;
+  }
+  .usage-controls .active-filters {
+    flex: 1 1 100%;
+  }
+  .usage-controls input[type="date"] {
+    min-width: 140px;
+  }
+  .usage-presets {
+    display: inline-flex;
+    gap: 6px;
+    flex-wrap: wrap;
+  }
+  .usage-presets .btn {
+    padding: 4px 8px;
+    font-size: 11px;
+  }
+  .usage-quick-filters {
+    display: flex;
+    gap: 8px;
+    align-items: center;
+    flex-wrap: wrap;
+  }
+  .usage-select {
+    min-width: 120px;
+    padding: 6px 10px;
+    border: 1px solid var(--border);
+    border-radius: 6px;
+    background: var(--bg);
+    color: var(--text);
+    font-size: 12px;
+  }
+  .usage-export-menu summary {
+    cursor: pointer;
+    font-weight: 500;
+    color: var(--text);
+    list-style: none;
+    display: inline-flex;
+    align-items: center;
+    gap: 6px;
+  }
+  .usage-export-menu summary::-webkit-details-marker {
+    display: none;
+  }
+  .usage-export-menu {
+    position: relative;
+  }
+  .usage-export-button {
+    display: inline-flex;
+    align-items: center;
+    gap: 6px;
+    padding: 6px 10px;
+    border-radius: 8px;
+    border: 1px solid var(--border);
+    background: var(--bg);
+    font-size: 12px;
+  }
+  .usage-export-popover {
+    position: absolute;
+    right: 0;
+    top: calc(100% + 6px);
+    background: var(--bg);
+    border: 1px solid var(--border);
+    border-radius: 10px;
+    padding: 8px;
+    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
+    min-width: 160px;
+    z-index: 10;
+  }
+  .usage-export-list {
+    display: flex;
+    flex-direction: column;
+    gap: 6px;
+  }
+  .usage-export-item {
+    text-align: left;
+    padding: 6px 10px;
+    border-radius: 8px;
+    border: 1px solid var(--border);
+    background: var(--bg-secondary);
+    font-size: 12px;
+  }
+  .usage-summary-grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
+    gap: 12px;
+    margin-top: 12px;
+  }
+  .usage-summary-card {
+    padding: 12px;
+    border-radius: 8px;
+    background: var(--bg-secondary);
+    border: 1px solid var(--border);
+  }
+  .usage-mosaic {
+    margin-top: 16px;
+    padding: 16px;
+  }
+  .usage-mosaic-header {
+    display: flex;
+    align-items: baseline;
+    justify-content: space-between;
+    gap: 12px;
+    margin-bottom: 12px;
+  }
+  .usage-mosaic-title {
+    font-weight: 600;
+  }
+  .usage-mosaic-sub {
+    font-size: 12px;
+    color: var(--text-muted);
+  }
+  .usage-mosaic-grid {
+    display: grid;
+    grid-template-columns: minmax(200px, 1fr) minmax(260px, 2fr);
+    gap: 16px;
+    align-items: start;
+  }
+  .usage-mosaic-section {
+    background: var(--bg-subtle);
+    border: 1px solid var(--border);
+    border-radius: 10px;
+    padding: 12px;
+  }
+  .usage-mosaic-section-title {
+    font-size: 12px;
+    font-weight: 600;
+    margin-bottom: 10px;
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+  }
+  .usage-mosaic-total {
+    font-size: 20px;
+    font-weight: 700;
+  }
+  .usage-daypart-grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
+    gap: 8px;
+  }
+  .usage-daypart-cell {
+    border-radius: 8px;
+    padding: 10px;
+    color: var(--text);
+    background: rgba(255, 77, 77, 0.08);
+    border: 1px solid rgba(255, 77, 77, 0.2);
+    display: flex;
+    flex-direction: column;
+    gap: 4px;
+  }
+  .usage-daypart-label {
+    font-size: 12px;
+    font-weight: 600;
+  }
+  .usage-daypart-value {
+    font-size: 14px;
+  }
+  .usage-hour-grid {
+    display: grid;
+    grid-template-columns: repeat(24, minmax(6px, 1fr));
+    gap: 4px;
+  }
+  .usage-hour-cell {
+    height: 28px;
+    border-radius: 6px;
+    background: rgba(255, 77, 77, 0.1);
+    border: 1px solid rgba(255, 77, 77, 0.2);
+    cursor: pointer;
+    transition: border-color 0.15s, box-shadow 0.15s;
+  }
+  .usage-hour-cell.selected {
+    border-color: rgba(255, 77, 77, 0.8);
+    box-shadow: 0 0 0 2px rgba(255, 77, 77, 0.2);
+  }
+  .usage-hour-labels {
+    display: grid;
+    grid-template-columns: repeat(6, minmax(0, 1fr));
+    gap: 6px;
+    margin-top: 8px;
+    font-size: 11px;
+    color: var(--text-muted);
+  }
+  .usage-hour-legend {
+    display: flex;
+    gap: 8px;
+    align-items: center;
+    margin-top: 10px;
+    font-size: 11px;
+    color: var(--text-muted);
+  }
+  .usage-hour-legend span {
+    display: inline-block;
+    width: 14px;
+    height: 10px;
+    border-radius: 4px;
+    background: rgba(255, 77, 77, 0.15);
+    border: 1px solid rgba(255, 77, 77, 0.2);
+  }
+  .usage-calendar-labels {
+    display: grid;
+    grid-template-columns: repeat(7, minmax(10px, 1fr));
+    gap: 6px;
+    font-size: 10px;
+    color: var(--text-muted);
+    margin-bottom: 6px;
+  }
+  .usage-calendar {
+    display: grid;
+    grid-template-columns: repeat(7, minmax(10px, 1fr));
+    gap: 6px;
+  }
+  .usage-calendar-cell {
+    height: 18px;
+    border-radius: 4px;
+    border: 1px solid rgba(255, 77, 77, 0.2);
+    background: rgba(255, 77, 77, 0.08);
+  }
+  .usage-calendar-cell.empty {
+    background: transparent;
+    border-color: transparent;
+  }
+  .usage-summary-title {
+    font-size: 11px;
+    color: var(--text-muted);
+    margin-bottom: 6px;
+    display: inline-flex;
+    align-items: center;
+    gap: 6px;
+  }
+  .usage-info {
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    width: 16px;
+    height: 16px;
+    margin-left: 6px;
+    border-radius: 999px;
+    border: 1px solid var(--border);
+    background: var(--bg);
+    font-size: 10px;
+    color: var(--text-muted);
+    cursor: help;
+  }
+  .usage-summary-value {
+    font-size: 16px;
+    font-weight: 600;
+    color: var(--text-strong);
+  }
+  .usage-summary-value.good {
+    color: #1f8f4e;
+  }
+  .usage-summary-value.warn {
+    color: #c57a00;
+  }
+  .usage-summary-value.bad {
+    color: #c9372c;
+  }
+  .usage-summary-hint {
+    font-size: 10px;
+    color: var(--text-muted);
+    cursor: help;
+    border: 1px solid var(--border);
+    border-radius: 999px;
+    padding: 0 6px;
+    line-height: 16px;
+    height: 16px;
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+  }
+  .usage-summary-sub {
+    font-size: 11px;
+    color: var(--text-muted);
+    margin-top: 4px;
+  }
+  .usage-list {
+    display: flex;
+    flex-direction: column;
+    gap: 8px;
+  }
+  .usage-list-item {
+    display: flex;
+    justify-content: space-between;
+    gap: 12px;
+    font-size: 12px;
+    color: var(--text);
+    align-items: flex-start;
+  }
+  .usage-list-value {
+    display: flex;
+    flex-direction: column;
+    align-items: flex-end;
+    gap: 2px;
+    text-align: right;
+  }
+  .usage-list-sub {
+    font-size: 11px;
+    color: var(--text-muted);
+  }
+  .usage-list-item.button {
+    border: none;
+    background: transparent;
+    padding: 0;
+    text-align: left;
+    cursor: pointer;
+  }
+  .usage-list-item.button:hover {
+    color: var(--text-strong);
+  }
+`;
diff --git a/ui/src/ui/views/usage-styles/usageStyles-part2.ts b/ui/src/ui/views/usage-styles/usageStyles-part2.ts
new file mode 100644
index 00000000000..ebf174a75a5
--- /dev/null
+++ b/ui/src/ui/views/usage-styles/usageStyles-part2.ts
@@ -0,0 +1,702 @@
+export const usageStylesPart2 = `
+  .usage-list-item .muted {
+    font-size: 11px;
+  }
+  .usage-error-list {
+    display: flex;
+    flex-direction: column;
+    gap: 10px;
+  }
+  .usage-error-row {
+    display: grid;
+    grid-template-columns: 1fr auto;
+    gap: 8px;
+    align-items: center;
+    font-size: 12px;
+  }
+  .usage-error-date {
+    font-weight: 600;
+  }
+  .usage-error-rate {
+    font-variant-numeric: tabular-nums;
+  }
+  .usage-error-sub {
+    grid-column: 1 / -1;
+    font-size: 11px;
+    color: var(--text-muted);
+  }
+  .usage-badges {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 6px;
+    margin-bottom: 8px;
+  }
+  .usage-badge {
+    display: inline-flex;
+    align-items: center;
+    gap: 6px;
+    padding: 2px 8px;
+    border: 1px solid var(--border);
+    border-radius: 999px;
+    font-size: 11px;
+    background: var(--bg);
+    color: var(--text);
+  }
+  .usage-meta-grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
+    gap: 12px;
+  }
+  .usage-meta-item {
+    display: flex;
+    flex-direction: column;
+    gap: 4px;
+    font-size: 12px;
+  }
+  .usage-meta-item span {
+    color: var(--text-muted);
+    font-size: 11px;
+  }
+  .usage-insights-grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
+    gap: 16px;
+    margin-top: 12px;
+  }
+  .usage-insight-card {
+    padding: 14px;
+    border-radius: 10px;
+    border: 1px solid var(--border);
+    background: var(--bg-secondary);
+  }
+  .usage-insight-title {
+    font-size: 12px;
+    font-weight: 600;
+    margin-bottom: 10px;
+  }
+  .usage-insight-subtitle {
+    font-size: 11px;
+    color: var(--text-muted);
+    margin-top: 6px;
+  }
+  /* ===== CHART TOGGLE ===== */
+  .chart-toggle {
+    display: flex;
+    background: var(--bg);
+    border-radius: 6px;
+    overflow: hidden;
+    border: 1px solid var(--border);
+  }
+  .chart-toggle .toggle-btn {
+    padding: 6px 14px;
+    font-size: 13px;
+    background: transparent;
+    border: none;
+    color: var(--text-muted);
+    cursor: pointer;
+    transition: all 0.15s;
+  }
+  .chart-toggle .toggle-btn:hover {
+    color: var(--text);
+  }
+  .chart-toggle .toggle-btn.active {
+    background: #ff4d4d;
+    color: white;
+  }
+  .chart-toggle.small .toggle-btn {
+    padding: 4px 8px;
+    font-size: 11px;
+  }
+  .sessions-toggle {
+    border-radius: 4px;
+  }
+  .sessions-toggle .toggle-btn {
+    border-radius: 4px;
+  }
+  .daily-chart-header {
+    display: flex;
+    align-items: center;
+    justify-content: flex-start;
+    gap: 8px;
+    margin-bottom: 6px;
+  }
+
+  /* ===== DAILY BAR CHART ===== */
+  .daily-chart {
+    margin-top: 12px;
+  }
+  .daily-chart-bars {
+    display: flex;
+    align-items: flex-end;
+    height: 200px;
+    gap: 4px;
+    padding: 8px 4px 36px;
+  }
+  .daily-bar-wrapper {
+    flex: 1;
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    height: 100%;
+    justify-content: flex-end;
+    cursor: pointer;
+    position: relative;
+    border-radius: 4px 4px 0 0;
+    transition: background 0.15s;
+    min-width: 0;
+  }
+  .daily-bar-wrapper:hover {
+    background: var(--bg-hover);
+  }
+  .daily-bar-wrapper.selected {
+    background: var(--accent-subtle);
+  }
+  .daily-bar-wrapper.selected .daily-bar {
+    background: var(--accent);
+  }
+  .daily-bar {
+    width: 100%;
+    max-width: var(--bar-max-width, 32px);
+    background: #ff4d4d;
+    border-radius: 3px 3px 0 0;
+    min-height: 2px;
+    transition: all 0.15s;
+    overflow: hidden;
+  }
+  .daily-bar-wrapper:hover .daily-bar {
+    background: #cc3d3d;
+  }
+  .daily-bar-label {
+    position: absolute;
+    bottom: -28px;
+    font-size: 10px;
+    color: var(--text-muted);
+    white-space: nowrap;
+    text-align: center;
+    transform: rotate(-35deg);
+    transform-origin: top center;
+  }
+  .daily-bar-total {
+    position: absolute;
+    top: -16px;
+    left: 50%;
+    transform: translateX(-50%);
+    font-size: 10px;
+    color: var(--text-muted);
+    white-space: nowrap;
+  }
+  .daily-bar-tooltip {
+    position: absolute;
+    bottom: calc(100% + 8px);
+    left: 50%;
+    transform: translateX(-50%);
+    background: var(--bg);
+    border: 1px solid var(--border);
+    border-radius: 6px;
+    padding: 8px 12px;
+    font-size: 12px;
+    white-space: nowrap;
+    z-index: 100;
+    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
+    pointer-events: none;
+    opacity: 0;
+    transition: opacity 0.15s;
+  }
+  .daily-bar-wrapper:hover .daily-bar-tooltip {
+    opacity: 1;
+  }
+
+  /* ===== COST/TOKEN BREAKDOWN BAR ===== */
+  .cost-breakdown {
+    margin-top: 18px;
+    padding: 16px;
+    background: var(--bg-secondary);
+    border-radius: 8px;
+  }
+  .cost-breakdown-header {
+    font-weight: 600;
+    font-size: 15px;
+    letter-spacing: -0.02em;
+    margin-bottom: 12px;
+    color: var(--text-strong);
+  }
+  .cost-breakdown-bar {
+    height: 28px;
+    background: var(--bg);
+    border-radius: 6px;
+    overflow: hidden;
+    display: flex;
+  }
+  .cost-segment {
+    height: 100%;
+    transition: width 0.3s ease;
+    position: relative;
+  }
+  .cost-segment.output {
+    background: #ef4444;
+  }
+  .cost-segment.input {
+    background: #f59e0b;
+  }
+  .cost-segment.cache-write {
+    background: #10b981;
+  }
+  .cost-segment.cache-read {
+    background: #06b6d4;
+  }
+  .cost-breakdown-legend {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 16px;
+    margin-top: 12px;
+  }
+  .cost-breakdown-total {
+    margin-top: 10px;
+    font-size: 12px;
+    color: var(--text-muted);
+  }
+  .legend-item {
+    display: flex;
+    align-items: center;
+    gap: 6px;
+    font-size: 12px;
+    color: var(--text);
+    cursor: help;
+  }
+  .legend-dot {
+    width: 10px;
+    height: 10px;
+    border-radius: 2px;
+    flex-shrink: 0;
+  }
+  .legend-dot.output {
+    background: #ef4444;
+  }
+  .legend-dot.input {
+    background: #f59e0b;
+  }
+  .legend-dot.cache-write {
+    background: #10b981;
+  }
+  .legend-dot.cache-read {
+    background: #06b6d4;
+  }
+  .legend-dot.system {
+    background: #ff4d4d;
+  }
+  .legend-dot.skills {
+    background: #8b5cf6;
+  }
+  .legend-dot.tools {
+    background: #ec4899;
+  }
+  .legend-dot.files {
+    background: #f59e0b;
+  }
+  .cost-breakdown-note {
+    margin-top: 10px;
+    font-size: 11px;
+    color: var(--text-muted);
+    line-height: 1.4;
+  }
+
+  /* ===== SESSION BARS (scrollable list) ===== */
+  .session-bars {
+    margin-top: 16px;
+    max-height: 400px;
+    overflow-y: auto;
+    border: 1px solid var(--border);
+    border-radius: 8px;
+    background: var(--bg);
+  }
+  .session-bar-row {
+    display: flex;
+    align-items: center;
+    gap: 12px;
+    padding: 10px 14px;
+    border-bottom: 1px solid var(--border);
+    cursor: pointer;
+    transition: background 0.15s;
+  }
+  .session-bar-row:last-child {
+    border-bottom: none;
+  }
+  .session-bar-row:hover {
+    background: var(--bg-hover);
+  }
+  .session-bar-row.selected {
+    background: var(--accent-subtle);
+  }
+  .session-bar-label {
+    flex: 1 1 auto;
+    min-width: 0;
+    font-size: 13px;
+    color: var(--text);
+    display: flex;
+    flex-direction: column;
+    gap: 2px;
+  }
+  .session-bar-title {
+    /* Prefer showing the full name; wrap instead of truncating. */
+    white-space: normal;
+    overflow-wrap: anywhere;
+    word-break: break-word;
+  }
+  .session-bar-meta {
+    font-size: 10px;
+    color: var(--text-muted);
+    font-weight: 400;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+  }
+  .session-bar-track {
+    flex: 0 0 90px;
+    height: 6px;
+    background: var(--bg-secondary);
+    border-radius: 4px;
+    overflow: hidden;
+    opacity: 0.6;
+  }
+  .session-bar-fill {
+    height: 100%;
+    background: rgba(255, 77, 77, 0.7);
+    border-radius: 4px;
+    transition: width 0.3s ease;
+  }
+  .session-bar-value {
+    flex: 0 0 70px;
+    text-align: right;
+    font-size: 12px;
+    font-family: var(--font-mono);
+    color: var(--text-muted);
+  }
+  .session-bar-actions {
+    display: inline-flex;
+    align-items: center;
+    gap: 8px;
+    flex: 0 0 auto;
+  }
+  .session-copy-btn {
+    height: 26px;
+    padding: 0 10px;
+    border-radius: 999px;
+    border: 1px solid var(--border);
+    background: var(--bg-secondary);
+    font-size: 11px;
+    font-weight: 600;
+    color: var(--text-muted);
+    cursor: pointer;
+    transition: background 0.15s, border-color 0.15s, color 0.15s;
+  }
+  .session-copy-btn:hover {
+    background: var(--bg);
+    border-color: var(--border-strong);
+    color: var(--text);
+  }
+
+  /* ===== TIME SERIES CHART ===== */
+  .session-timeseries {
+    margin-top: 24px;
+    padding: 16px;
+    background: var(--bg-secondary);
+    border-radius: 8px;
+  }
+  .timeseries-header-row {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    margin-bottom: 12px;
+  }
+  .timeseries-controls {
+    display: flex;
+    gap: 6px;
+    align-items: center;
+  }
+  .timeseries-header {
+    font-weight: 600;
+    color: var(--text);
+  }
+  .timeseries-chart {
+    width: 100%;
+    overflow: hidden;
+  }
+  .timeseries-svg {
+    width: 100%;
+    height: auto;
+    display: block;
+  }
+  .timeseries-svg .axis-label {
+    font-size: 10px;
+    fill: var(--text-muted);
+  }
+  .timeseries-svg .ts-area {
+    fill: #ff4d4d;
+    fill-opacity: 0.1;
+  }
+  .timeseries-svg .ts-line {
+    fill: none;
+    stroke: #ff4d4d;
+    stroke-width: 2;
+  }
+  .timeseries-svg .ts-dot {
+    fill: #ff4d4d;
+    transition: r 0.15s, fill 0.15s;
+  }
+  .timeseries-svg .ts-dot:hover {
+    r: 5;
+  }
+  .timeseries-svg .ts-bar {
+    fill: #ff4d4d;
+    transition: fill 0.15s;
+  }
+  .timeseries-svg .ts-bar:hover {
+    fill: #cc3d3d;
+  }
+  .timeseries-svg .ts-bar.output { fill: #ef4444; }
+  .timeseries-svg .ts-bar.input { fill: #f59e0b; }
+  .timeseries-svg .ts-bar.cache-write { fill: #10b981; }
+  .timeseries-svg .ts-bar.cache-read { fill: #06b6d4; }
+  .timeseries-summary {
+    margin-top: 12px;
+    font-size: 13px;
+    color: var(--text-muted);
+    display: flex;
+    flex-wrap: wrap;
+    gap: 8px;
+  }
+  .timeseries-loading {
+    padding: 24px;
+    text-align: center;
+    color: var(--text-muted);
+  }
+
+  /* ===== SESSION LOGS ===== */
+  .session-logs {
+    margin-top: 24px;
+    background: var(--bg-secondary);
+    border-radius: 8px;
+    overflow: hidden;
+  }
+  .session-logs-header {
+    padding: 10px 14px;
+    font-weight: 600;
+    border-bottom: 1px solid var(--border);
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    font-size: 13px;
+    background: var(--bg-secondary);
+  }
+  .session-logs-loading {
+    padding: 24px;
+    text-align: center;
+    color: var(--text-muted);
+  }
+  .session-logs-list {
+    max-height: 400px;
+    overflow-y: auto;
+  }
+  .session-log-entry {
+    padding: 10px 14px;
+    border-bottom: 1px solid var(--border);
+    display: flex;
+    flex-direction: column;
+    gap: 6px;
+    background: var(--bg);
+  }
+  .session-log-entry:last-child {
+    border-bottom: none;
+  }
+  .session-log-entry.user {
+    border-left: 3px solid var(--accent);
+  }
+  .session-log-entry.assistant {
+    border-left: 3px solid var(--border-strong);
+  }
+  .session-log-meta {
+    display: flex;
+    gap: 8px;
+    align-items: center;
+    font-size: 11px;
+    color: var(--text-muted);
+    flex-wrap: wrap;
+  }
+  .session-log-role {
+    font-weight: 600;
+    text-transform: uppercase;
+    letter-spacing: 0.04em;
+    font-size: 10px;
+    padding: 2px 6px;
+    border-radius: 999px;
+    background: var(--bg-secondary);
+    border: 1px solid var(--border);
+  }
+  .session-log-entry.user .session-log-role {
+    color: var(--accent);
+  }
+  .session-log-entry.assistant .session-log-role {
+    color: var(--text-muted);
+  }
+  .session-log-content {
+    font-size: 13px;
+    line-height: 1.5;
+    color: var(--text);
+    white-space: pre-wrap;
+    word-break: break-word;
+    background: var(--bg-secondary);
+    border-radius: 8px;
+    padding: 8px 10px;
+    border: 1px solid var(--border);
+    max-height: 220px;
+    overflow-y: auto;
+  }
+
+  /* ===== CONTEXT WEIGHT BREAKDOWN ===== */
+  .context-weight-breakdown {
+    margin-top: 24px;
+    padding: 16px;
+    background: var(--bg-secondary);
+    border-radius: 8px;
+  }
+  .context-weight-breakdown .context-weight-header {
+    font-weight: 600;
+    font-size: 13px;
+    margin-bottom: 4px;
+    color: var(--text);
+  }
+  .context-weight-desc {
+    font-size: 12px;
+    color: var(--text-muted);
+    margin: 0 0 12px 0;
+  }
+  .context-stacked-bar {
+    height: 24px;
+    background: var(--bg);
+    border-radius: 6px;
+    overflow: hidden;
+    display: flex;
+  }
+  .context-segment {
+    height: 100%;
+    transition: width 0.3s ease;
+  }
+  .context-segment.system {
+    background: #ff4d4d;
+  }
+  .context-segment.skills {
+    background: #8b5cf6;
+  }
+  .context-segment.tools {
+    background: #ec4899;
+  }
+  .context-segment.files {
+    background: #f59e0b;
+  }
+  .context-legend {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 16px;
+    margin-top: 12px;
+  }
+  .context-total {
+    margin-top: 10px;
+    font-size: 12px;
+    font-weight: 600;
+    color: var(--text-muted);
+  }
+  .context-details {
+    margin-top: 12px;
+    border: 1px solid var(--border);
+    border-radius: 6px;
+    overflow: hidden;
+  }
+  .context-details summary {
+    padding: 10px 14px;
+    font-size: 13px;
+    font-weight: 500;
+    cursor: pointer;
+    background: var(--bg);
+    border-bottom: 1px solid var(--border);
+  }
+  .context-details[open] summary {
+    border-bottom: 1px solid var(--border);
+  }
+  .context-list {
+    max-height: 200px;
+    overflow-y: auto;
+  }
+  .context-list-header {
+    display: flex;
+    justify-content: space-between;
+    padding: 8px 14px;
+    font-size: 11px;
+    text-transform: uppercase;
+    color: var(--text-muted);
+    background: var(--bg-secondary);
+    border-bottom: 1px solid var(--border);
+  }
+  .context-list-item {
+    display: flex;
+    justify-content: space-between;
+    padding: 8px 14px;
+    font-size: 12px;
+    border-bottom: 1px solid var(--border);
+  }
+  .context-list-item:last-child {
+    border-bottom: none;
+  }
+  .context-list-item .mono {
+    font-family: var(--font-mono);
+    color: var(--text);
+  }
+  .context-list-item .muted {
+    color: var(--text-muted);
+    font-family: var(--font-mono);
+  }
+
+  /* ===== NO CONTEXT NOTE ===== */
+  .no-context-note {
+    margin-top: 24px;
+    padding: 16px;
+    background: var(--bg-secondary);
+    border-radius: 8px;
+    font-size: 13px;
+    color: var(--text-muted);
+    line-height: 1.5;
+  }
+
+  /* ===== TWO COLUMN LAYOUT ===== */
+  .usage-grid {
+    display: grid;
+    grid-template-columns: 1fr 1fr;
+    gap: 18px;
+    margin-top: 18px;
+    align-items: stretch;
+  }
+  .usage-grid-left {
+    display: flex;
+    flex-direction: column;
+  }
+  .usage-grid-right {
+    display: flex;
+    flex-direction: column;
+  }
+  
+  /* ===== LEFT CARD (Daily + Breakdown) ===== */
+  .usage-left-card {
+    /* inherits background, border, shadow from .card */
+    flex: 1;
+    display: flex;
+    flex-direction: column;
+  }
+  .usage-left-card .daily-chart-bars {
+    flex: 1;
+    min-height: 200px;
+  }
+  .usage-left-card .sessions-panel-title {
+    font-weight: 600;
+    font-size: 14px;
+    margin-bottom: 12px;
+  }
+`;
diff --git a/ui/src/ui/views/usage-styles/usageStyles-part3.ts b/ui/src/ui/views/usage-styles/usageStyles-part3.ts
new file mode 100644
index 00000000000..2c5f89555ab
--- /dev/null
+++ b/ui/src/ui/views/usage-styles/usageStyles-part3.ts
@@ -0,0 +1,512 @@
+export const usageStylesPart3 = `
+  
+  /* ===== COMPACT DAILY CHART ===== */
+  .daily-chart-compact {
+    margin-bottom: 16px;
+  }
+  .daily-chart-compact .sessions-panel-title {
+    margin-bottom: 8px;
+  }
+  .daily-chart-compact .daily-chart-bars {
+    height: 100px;
+    padding-bottom: 20px;
+  }
+  
+  /* ===== COMPACT COST BREAKDOWN ===== */
+  .cost-breakdown-compact {
+    padding: 0;
+    margin: 0;
+    background: transparent;
+    border-top: 1px solid var(--border);
+    padding-top: 12px;
+  }
+  .cost-breakdown-compact .cost-breakdown-header {
+    margin-bottom: 8px;
+  }
+  .cost-breakdown-compact .cost-breakdown-legend {
+    gap: 12px;
+  }
+  .cost-breakdown-compact .cost-breakdown-note {
+    display: none;
+  }
+  
+  /* ===== SESSIONS CARD ===== */
+  .sessions-card {
+    /* inherits background, border, shadow from .card */
+    flex: 1;
+    display: flex;
+    flex-direction: column;
+  }
+  .sessions-card-header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    margin-bottom: 8px;
+  }
+  .sessions-card-title {
+    font-weight: 600;
+    font-size: 14px;
+  }
+  .sessions-card-count {
+    font-size: 12px;
+    color: var(--text-muted);
+  }
+  .sessions-card-meta {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: 12px;
+    margin: 8px 0 10px;
+    font-size: 12px;
+    color: var(--text-muted);
+  }
+  .sessions-card-stats {
+    display: inline-flex;
+    gap: 12px;
+  }
+  .sessions-sort {
+    display: inline-flex;
+    align-items: center;
+    gap: 6px;
+    font-size: 12px;
+    color: var(--text-muted);
+  }
+  .sessions-sort select {
+    padding: 4px 8px;
+    border-radius: 6px;
+    border: 1px solid var(--border);
+    background: var(--bg);
+    color: var(--text);
+    font-size: 12px;
+  }
+  .sessions-action-btn {
+    height: 28px;
+    padding: 0 10px;
+    border-radius: 8px;
+    font-size: 12px;
+    line-height: 1;
+  }
+  .sessions-action-btn.icon {
+    width: 32px;
+    padding: 0;
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+  }
+  .sessions-card-hint {
+    font-size: 11px;
+    color: var(--text-muted);
+    margin-bottom: 8px;
+  }
+  .sessions-card .session-bars {
+    max-height: 280px;
+    background: var(--bg);
+    border-radius: 6px;
+    border: 1px solid var(--border);
+    margin: 0;
+    overflow-y: auto;
+    padding: 8px;
+  }
+  .sessions-card .session-bar-row {
+    padding: 6px 8px;
+    border-radius: 6px;
+    margin-bottom: 3px;
+    border: 1px solid transparent;
+    transition: all 0.15s;
+  }
+  .sessions-card .session-bar-row:hover {
+    border-color: var(--border);
+    background: var(--bg-hover);
+  }
+  .sessions-card .session-bar-row.selected {
+    border-color: var(--accent);
+    background: var(--accent-subtle);
+    box-shadow: inset 0 0 0 1px rgba(255, 77, 77, 0.15);
+  }
+  .sessions-card .session-bar-label {
+    flex: 1 1 auto;
+    min-width: 140px;
+    font-size: 12px;
+  }
+  .sessions-card .session-bar-value {
+    flex: 0 0 60px;
+    font-size: 11px;
+    font-weight: 600;
+  }
+  .sessions-card .session-bar-track {
+    flex: 0 0 70px;
+    height: 5px;
+    opacity: 0.5;
+  }
+  .sessions-card .session-bar-fill {
+    background: rgba(255, 77, 77, 0.55);
+  }
+  .sessions-clear-btn {
+    margin-left: auto;
+  }
+  
+  /* ===== EMPTY DETAIL STATE ===== */
+  .session-detail-empty {
+    margin-top: 18px;
+    background: var(--bg-secondary);
+    border-radius: 8px;
+    border: 2px dashed var(--border);
+    padding: 32px;
+    text-align: center;
+  }
+  .session-detail-empty-title {
+    font-size: 15px;
+    font-weight: 600;
+    color: var(--text);
+    margin-bottom: 8px;
+  }
+  .session-detail-empty-desc {
+    font-size: 13px;
+    color: var(--text-muted);
+    margin-bottom: 16px;
+    line-height: 1.5;
+  }
+  .session-detail-empty-features {
+    display: flex;
+    justify-content: center;
+    gap: 24px;
+    flex-wrap: wrap;
+  }
+  .session-detail-empty-feature {
+    display: flex;
+    align-items: center;
+    gap: 6px;
+    font-size: 12px;
+    color: var(--text-muted);
+  }
+  .session-detail-empty-feature .icon {
+    font-size: 16px;
+  }
+  
+  /* ===== SESSION DETAIL PANEL ===== */
+  .session-detail-panel {
+    margin-top: 12px;
+    /* inherits background, border-radius, shadow from .card */
+    border: 2px solid var(--accent) !important;
+  }
+  .session-detail-header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    padding: 8px 12px;
+    border-bottom: 1px solid var(--border);
+    cursor: pointer;
+  }
+  .session-detail-header:hover {
+    background: var(--bg-hover);
+  }
+  .session-detail-title {
+    font-weight: 600;
+    font-size: 14px;
+    display: flex;
+    align-items: center;
+    gap: 8px;
+  }
+  .session-detail-header-left {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+  }
+  .session-close-btn {
+    background: var(--bg);
+    border: 1px solid var(--border);
+    color: var(--text);
+    cursor: pointer;
+    padding: 2px 8px;
+    font-size: 16px;
+    line-height: 1;
+    border-radius: 4px;
+    transition: background 0.15s, color 0.15s;
+  }
+  .session-close-btn:hover {
+    background: var(--bg-hover);
+    color: var(--text);
+    border-color: var(--accent);
+  }
+  .session-detail-stats {
+    display: flex;
+    gap: 10px;
+    font-size: 12px;
+    color: var(--text-muted);
+  }
+  .session-detail-stats strong {
+    color: var(--text);
+    font-family: var(--font-mono);
+  }
+  .session-detail-content {
+    padding: 12px;
+  }
+  .session-summary-grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
+    gap: 8px;
+    margin-bottom: 12px;
+  }
+  .session-summary-card {
+    border: 1px solid var(--border);
+    border-radius: 8px;
+    padding: 8px;
+    background: var(--bg-secondary);
+  }
+  .session-summary-title {
+    font-size: 11px;
+    color: var(--text-muted);
+    margin-bottom: 4px;
+  }
+  .session-summary-value {
+    font-size: 14px;
+    font-weight: 600;
+  }
+  .session-summary-meta {
+    font-size: 11px;
+    color: var(--text-muted);
+    margin-top: 4px;
+  }
+  .session-detail-row {
+    display: grid;
+    grid-template-columns: 1fr;
+    gap: 10px;
+    /* Separate "Usage Over Time" from the summary + Top Tools/Model Mix cards above. */
+    margin-top: 12px;
+    margin-bottom: 10px;
+  }
+  .session-detail-bottom {
+    display: grid;
+    grid-template-columns: minmax(0, 1.8fr) minmax(0, 1fr);
+    gap: 10px;
+    align-items: stretch;
+  }
+  .session-detail-bottom .session-logs-compact {
+    margin: 0;
+    display: flex;
+    flex-direction: column;
+  }
+  .session-detail-bottom .session-logs-compact .session-logs-list {
+    flex: 1 1 auto;
+    max-height: none;
+  }
+  .context-details-panel {
+    display: flex;
+    flex-direction: column;
+    gap: 8px;
+    background: var(--bg);
+    border-radius: 6px;
+    border: 1px solid var(--border);
+    padding: 12px;
+  }
+  .context-breakdown-grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
+    gap: 10px;
+    margin-top: 8px;
+  }
+  .context-breakdown-card {
+    border: 1px solid var(--border);
+    border-radius: 8px;
+    padding: 8px;
+    background: var(--bg-secondary);
+  }
+  .context-breakdown-title {
+    font-size: 11px;
+    font-weight: 600;
+    margin-bottom: 6px;
+  }
+  .context-breakdown-list {
+    display: flex;
+    flex-direction: column;
+    gap: 6px;
+    font-size: 11px;
+  }
+  .context-breakdown-item {
+    display: flex;
+    justify-content: space-between;
+    gap: 8px;
+  }
+  .context-breakdown-more {
+    font-size: 10px;
+    color: var(--text-muted);
+    margin-top: 4px;
+  }
+  .context-breakdown-header {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: 12px;
+  }
+  .context-expand-btn {
+    border: 1px solid var(--border);
+    background: var(--bg-secondary);
+    color: var(--text-muted);
+    font-size: 11px;
+    padding: 4px 8px;
+    border-radius: 999px;
+    cursor: pointer;
+    transition: all 0.15s;
+  }
+  .context-expand-btn:hover {
+    color: var(--text);
+    border-color: var(--border-strong);
+    background: var(--bg);
+  }
+  
+  /* ===== COMPACT TIMESERIES ===== */
+  .session-timeseries-compact {
+    background: var(--bg);
+    border-radius: 6px;
+    border: 1px solid var(--border);
+    padding: 12px;
+    margin: 0;
+  }
+  .session-timeseries-compact .timeseries-header-row {
+    margin-bottom: 8px;
+  }
+  .session-timeseries-compact .timeseries-header {
+    font-size: 12px;
+  }
+  .session-timeseries-compact .timeseries-summary {
+    font-size: 11px;
+    margin-top: 8px;
+  }
+  
+  /* ===== COMPACT CONTEXT ===== */
+  .context-weight-compact {
+    background: var(--bg);
+    border-radius: 6px;
+    border: 1px solid var(--border);
+    padding: 12px;
+    margin: 0;
+  }
+  .context-weight-compact .context-weight-header {
+    font-size: 12px;
+    margin-bottom: 4px;
+  }
+  .context-weight-compact .context-weight-desc {
+    font-size: 11px;
+    margin-bottom: 8px;
+  }
+  .context-weight-compact .context-stacked-bar {
+    height: 16px;
+  }
+  .context-weight-compact .context-legend {
+    font-size: 11px;
+    gap: 10px;
+    margin-top: 8px;
+  }
+  .context-weight-compact .context-total {
+    font-size: 11px;
+    margin-top: 6px;
+  }
+  .context-weight-compact .context-details {
+    margin-top: 8px;
+  }
+  .context-weight-compact .context-details summary {
+    font-size: 12px;
+    padding: 6px 10px;
+  }
+  
+  /* ===== COMPACT LOGS ===== */
+  .session-logs-compact {
+    background: var(--bg);
+    border-radius: 10px;
+    border: 1px solid var(--border);
+    overflow: hidden;
+    margin: 0;
+    display: flex;
+    flex-direction: column;
+  }
+  .session-logs-compact .session-logs-header {
+    padding: 10px 12px;
+    font-size: 12px;
+  }
+  .session-logs-compact .session-logs-list {
+    max-height: none;
+    flex: 1 1 auto;
+    overflow: auto;
+  }
+  .session-logs-compact .session-log-entry {
+    padding: 8px 12px;
+  }
+  .session-logs-compact .session-log-content {
+    font-size: 12px;
+    max-height: 160px;
+  }
+  .session-log-tools {
+    margin-top: 6px;
+    border: 1px solid var(--border);
+    border-radius: 8px;
+    background: var(--bg-secondary);
+    padding: 6px 8px;
+    font-size: 11px;
+    color: var(--text);
+  }
+  .session-log-tools summary {
+    cursor: pointer;
+    list-style: none;
+    display: flex;
+    align-items: center;
+    gap: 6px;
+    font-weight: 600;
+  }
+  .session-log-tools summary::-webkit-details-marker {
+    display: none;
+  }
+  .session-log-tools-list {
+    margin-top: 6px;
+    display: flex;
+    flex-wrap: wrap;
+    gap: 6px;
+  }
+  .session-log-tools-pill {
+    border: 1px solid var(--border);
+    border-radius: 999px;
+    padding: 2px 8px;
+    font-size: 10px;
+    background: var(--bg);
+    color: var(--text);
+  }
+
+  /* ===== RESPONSIVE ===== */
+  @media (max-width: 900px) {
+    .usage-grid {
+      grid-template-columns: 1fr;
+    }
+    .session-detail-row {
+      grid-template-columns: 1fr;
+    }
+  }
+  @media (max-width: 600px) {
+    .session-bar-label {
+      flex: 0 0 100px;
+    }
+    .cost-breakdown-legend {
+      gap: 10px;
+    }
+    .legend-item {
+      font-size: 11px;
+    }
+    .daily-chart-bars {
+      height: 170px;
+      gap: 6px;
+      padding-bottom: 40px;
+    }
+    .daily-bar-label {
+      font-size: 8px;
+      bottom: -30px;
+      transform: rotate(-45deg);
+    }
+    .usage-mosaic-grid {
+      grid-template-columns: 1fr;
+    }
+    .usage-hour-grid {
+      grid-template-columns: repeat(12, minmax(10px, 1fr));
+    }
+    .usage-hour-cell {
+      height: 22px;
+    }
+  }
+`;
diff --git a/ui/src/ui/views/usageStyles.ts b/ui/src/ui/views/usageStyles.ts
index dd8302a4d09..87ec531f5e4 100644
--- a/ui/src/ui/views/usageStyles.ts
+++ b/ui/src/ui/views/usageStyles.ts
@@ -1,1911 +1,5 @@
-export const usageStylesString = `
-  .usage-page-header {
-    margin: 4px 0 12px;
-  }
-  .usage-page-title {
-    font-size: 28px;
-    font-weight: 700;
-    letter-spacing: -0.02em;
-    margin-bottom: 4px;
-  }
-  .usage-page-subtitle {
-    font-size: 13px;
-    color: var(--text-muted);
-    margin: 0 0 12px;
-  }
-  /* ===== FILTERS & HEADER ===== */
-  .usage-filters-inline {
-    display: flex;
-    gap: 8px;
-    align-items: center;
-    flex-wrap: wrap;
-  }
-  .usage-filters-inline select {
-    padding: 6px 10px;
-    border: 1px solid var(--border);
-    border-radius: 6px;
-    background: var(--bg);
-    color: var(--text);
-    font-size: 13px;
-  }
-  .usage-filters-inline input[type="date"] {
-    padding: 6px 10px;
-    border: 1px solid var(--border);
-    border-radius: 6px;
-    background: var(--bg);
-    color: var(--text);
-    font-size: 13px;
-  }
-  .usage-filters-inline input[type="text"] {
-    padding: 6px 10px;
-    border: 1px solid var(--border);
-    border-radius: 6px;
-    background: var(--bg);
-    color: var(--text);
-    font-size: 13px;
-    min-width: 180px;
-  }
-  .usage-filters-inline .btn-sm {
-    padding: 6px 12px;
-    font-size: 14px;
-  }
-  .usage-refresh-indicator {
-    display: inline-flex;
-    align-items: center;
-    gap: 6px;
-    padding: 4px 10px;
-    background: rgba(255, 77, 77, 0.1);
-    border-radius: 4px;
-    font-size: 12px;
-    color: #ff4d4d;
-  }
-  .usage-refresh-indicator::before {
-    content: "";
-    width: 10px;
-    height: 10px;
-    border: 2px solid #ff4d4d;
-    border-top-color: transparent;
-    border-radius: 50%;
-    animation: usage-spin 0.6s linear infinite;
-  }
-  @keyframes usage-spin {
-    to { transform: rotate(360deg); }
-  }
-  .active-filters {
-    display: flex;
-    align-items: center;
-    gap: 8px;
-    flex-wrap: wrap;
-  }
-  .filter-chip {
-    display: flex;
-    align-items: center;
-    gap: 6px;
-    padding: 4px 8px 4px 12px;
-    background: var(--accent-subtle);
-    border: 1px solid var(--accent);
-    border-radius: 16px;
-    font-size: 12px;
-  }
-  .filter-chip-label {
-    color: var(--accent);
-    font-weight: 500;
-  }
-  .filter-chip-remove {
-    background: none;
-    border: none;
-    color: var(--accent);
-    cursor: pointer;
-    padding: 2px 4px;
-    font-size: 14px;
-    line-height: 1;
-    opacity: 0.7;
-    transition: opacity 0.15s;
-  }
-  .filter-chip-remove:hover {
-    opacity: 1;
-  }
-  .filter-clear-btn {
-    padding: 4px 10px !important;
-    font-size: 12px !important;
-    line-height: 1 !important;
-    margin-left: 8px;
-  }
-  .usage-query-bar {
-    display: grid;
-    grid-template-columns: minmax(220px, 1fr) auto;
-    gap: 10px;
-    align-items: center;
-    /* Keep the dropdown filter row from visually touching the query row. */
-    margin-bottom: 10px;
-  }
-  .usage-query-actions {
-    display: flex;
-    align-items: center;
-    gap: 6px;
-    flex-wrap: nowrap;
-    justify-self: end;
-  }
-  .usage-query-actions .btn {
-    height: 34px;
-    padding: 0 14px;
-    border-radius: 999px;
-    font-weight: 600;
-    font-size: 13px;
-    line-height: 1;
-    border: 1px solid var(--border);
-    background: var(--bg-secondary);
-    color: var(--text);
-    box-shadow: none;
-    transition: background 0.15s, border-color 0.15s, color 0.15s;
-  }
-  .usage-query-actions .btn:hover {
-    background: var(--bg);
-    border-color: var(--border-strong);
-  }
-  .usage-action-btn {
-    height: 34px;
-    padding: 0 14px;
-    border-radius: 999px;
-    font-weight: 600;
-    font-size: 13px;
-    line-height: 1;
-    border: 1px solid var(--border);
-    background: var(--bg-secondary);
-    color: var(--text);
-    box-shadow: none;
-    transition: background 0.15s, border-color 0.15s, color 0.15s;
-  }
-  .usage-action-btn:hover {
-    background: var(--bg);
-    border-color: var(--border-strong);
-  }
-  .usage-primary-btn {
-    background: #ff4d4d;
-    color: #fff;
-    border-color: #ff4d4d;
-    box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.12);
-  }
-  .btn.usage-primary-btn {
-    background: #ff4d4d !important;
-    border-color: #ff4d4d !important;
-    color: #fff !important;
-  }
-  .usage-primary-btn:hover {
-    background: #e64545;
-    border-color: #e64545;
-  }
-  .btn.usage-primary-btn:hover {
-    background: #e64545 !important;
-    border-color: #e64545 !important;
-  }
-  .usage-primary-btn:disabled {
-    background: rgba(255, 77, 77, 0.18);
-    border-color: rgba(255, 77, 77, 0.3);
-    color: #ff4d4d;
-    box-shadow: none;
-    cursor: default;
-    opacity: 1;
-  }
-  .usage-primary-btn[disabled] {
-    background: rgba(255, 77, 77, 0.18) !important;
-    border-color: rgba(255, 77, 77, 0.3) !important;
-    color: #ff4d4d !important;
-    opacity: 1 !important;
-  }
-  .usage-secondary-btn {
-    background: var(--bg-secondary);
-    color: var(--text);
-    border-color: var(--border);
-  }
-  .usage-query-input {
-    width: 100%;
-    min-width: 220px;
-    padding: 6px 10px;
-    border: 1px solid var(--border);
-    border-radius: 6px;
-    background: var(--bg);
-    color: var(--text);
-    font-size: 13px;
-  }
-  .usage-query-suggestions {
-    display: flex;
-    flex-wrap: wrap;
-    gap: 6px;
-    margin-top: 6px;
-  }
-  .usage-query-suggestion {
-    padding: 4px 8px;
-    border-radius: 999px;
-    border: 1px solid var(--border);
-    background: var(--bg-secondary);
-    font-size: 11px;
-    color: var(--text);
-    cursor: pointer;
-    transition: background 0.15s;
-  }
-  .usage-query-suggestion:hover {
-    background: var(--bg-hover);
-  }
-  .usage-filter-row {
-    display: flex;
-    flex-wrap: wrap;
-    gap: 8px;
-    align-items: center;
-    margin-top: 14px;
-  }
-  details.usage-filter-select {
-    position: relative;
-    border: 1px solid var(--border);
-    border-radius: 10px;
-    padding: 6px 10px;
-    background: var(--bg);
-    font-size: 12px;
-    min-width: 140px;
-  }
-  details.usage-filter-select summary {
-    cursor: pointer;
-    list-style: none;
-    display: flex;
-    align-items: center;
-    justify-content: space-between;
-    gap: 6px;
-    font-weight: 500;
-  }
-  details.usage-filter-select summary::-webkit-details-marker {
-    display: none;
-  }
-  .usage-filter-badge {
-    font-size: 11px;
-    color: var(--text-muted);
-  }
-  .usage-filter-popover {
-    position: absolute;
-    left: 0;
-    top: calc(100% + 6px);
-    background: var(--bg);
-    border: 1px solid var(--border);
-    border-radius: 10px;
-    padding: 10px;
-    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
-    min-width: 220px;
-    z-index: 20;
-  }
-  .usage-filter-actions {
-    display: flex;
-    gap: 6px;
-    margin-bottom: 8px;
-  }
-  .usage-filter-actions button {
-    border-radius: 999px;
-    padding: 4px 10px;
-    font-size: 11px;
-  }
-  .usage-filter-options {
-    display: flex;
-    flex-direction: column;
-    gap: 6px;
-    max-height: 200px;
-    overflow: auto;
-  }
-  .usage-filter-option {
-    display: flex;
-    align-items: center;
-    gap: 6px;
-    font-size: 12px;
-  }
-  .usage-query-hint {
-    font-size: 11px;
-    color: var(--text-muted);
-  }
-  .usage-query-chips {
-    display: flex;
-    flex-wrap: wrap;
-    gap: 6px;
-    margin-top: 6px;
-  }
-  .usage-query-chip {
-    display: inline-flex;
-    align-items: center;
-    gap: 6px;
-    padding: 4px 8px;
-    border-radius: 999px;
-    border: 1px solid var(--border);
-    background: var(--bg-secondary);
-    font-size: 11px;
-  }
-  .usage-query-chip button {
-    background: none;
-    border: none;
-    color: var(--text-muted);
-    cursor: pointer;
-    padding: 0;
-    line-height: 1;
-  }
-  .usage-header {
-    display: flex;
-    flex-direction: column;
-    gap: 10px;
-    background: var(--bg);
-  }
-  .usage-header.pinned {
-    position: sticky;
-    top: 12px;
-    z-index: 6;
-    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.06);
-  }
-  .usage-pin-btn {
-    display: inline-flex;
-    align-items: center;
-    gap: 6px;
-    padding: 4px 8px;
-    border-radius: 999px;
-    border: 1px solid var(--border);
-    background: var(--bg-secondary);
-    font-size: 11px;
-    color: var(--text);
-    cursor: pointer;
-  }
-  .usage-pin-btn.active {
-    background: var(--accent-subtle);
-    border-color: var(--accent);
-    color: var(--accent);
-  }
-  .usage-header-row {
-    display: flex;
-    align-items: center;
-    justify-content: space-between;
-    gap: 12px;
-    flex-wrap: wrap;
-  }
-  .usage-header-title {
-    display: flex;
-    align-items: center;
-    gap: 10px;
-  }
-  .usage-header-metrics {
-    display: flex;
-    align-items: center;
-    gap: 12px;
-    flex-wrap: wrap;
-  }
-  .usage-metric-badge {
-    display: inline-flex;
-    align-items: baseline;
-    gap: 6px;
-    padding: 2px 8px;
-    border-radius: 999px;
-    border: 1px solid var(--border);
-    background: transparent;
-    font-size: 11px;
-    color: var(--text-muted);
-  }
-  .usage-metric-badge strong {
-    font-size: 12px;
-    color: var(--text);
-  }
-  .usage-controls {
-    display: flex;
-    align-items: center;
-    gap: 10px;
-    flex-wrap: wrap;
-  }
-  .usage-controls .active-filters {
-    flex: 1 1 100%;
-  }
-  .usage-controls input[type="date"] {
-    min-width: 140px;
-  }
-  .usage-presets {
-    display: inline-flex;
-    gap: 6px;
-    flex-wrap: wrap;
-  }
-  .usage-presets .btn {
-    padding: 4px 8px;
-    font-size: 11px;
-  }
-  .usage-quick-filters {
-    display: flex;
-    gap: 8px;
-    align-items: center;
-    flex-wrap: wrap;
-  }
-  .usage-select {
-    min-width: 120px;
-    padding: 6px 10px;
-    border: 1px solid var(--border);
-    border-radius: 6px;
-    background: var(--bg);
-    color: var(--text);
-    font-size: 12px;
-  }
-  .usage-export-menu summary {
-    cursor: pointer;
-    font-weight: 500;
-    color: var(--text);
-    list-style: none;
-    display: inline-flex;
-    align-items: center;
-    gap: 6px;
-  }
-  .usage-export-menu summary::-webkit-details-marker {
-    display: none;
-  }
-  .usage-export-menu {
-    position: relative;
-  }
-  .usage-export-button {
-    display: inline-flex;
-    align-items: center;
-    gap: 6px;
-    padding: 6px 10px;
-    border-radius: 8px;
-    border: 1px solid var(--border);
-    background: var(--bg);
-    font-size: 12px;
-  }
-  .usage-export-popover {
-    position: absolute;
-    right: 0;
-    top: calc(100% + 6px);
-    background: var(--bg);
-    border: 1px solid var(--border);
-    border-radius: 10px;
-    padding: 8px;
-    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
-    min-width: 160px;
-    z-index: 10;
-  }
-  .usage-export-list {
-    display: flex;
-    flex-direction: column;
-    gap: 6px;
-  }
-  .usage-export-item {
-    text-align: left;
-    padding: 6px 10px;
-    border-radius: 8px;
-    border: 1px solid var(--border);
-    background: var(--bg-secondary);
-    font-size: 12px;
-  }
-  .usage-summary-grid {
-    display: grid;
-    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
-    gap: 12px;
-    margin-top: 12px;
-  }
-  .usage-summary-card {
-    padding: 12px;
-    border-radius: 8px;
-    background: var(--bg-secondary);
-    border: 1px solid var(--border);
-  }
-  .usage-mosaic {
-    margin-top: 16px;
-    padding: 16px;
-  }
-  .usage-mosaic-header {
-    display: flex;
-    align-items: baseline;
-    justify-content: space-between;
-    gap: 12px;
-    margin-bottom: 12px;
-  }
-  .usage-mosaic-title {
-    font-weight: 600;
-  }
-  .usage-mosaic-sub {
-    font-size: 12px;
-    color: var(--text-muted);
-  }
-  .usage-mosaic-grid {
-    display: grid;
-    grid-template-columns: minmax(200px, 1fr) minmax(260px, 2fr);
-    gap: 16px;
-    align-items: start;
-  }
-  .usage-mosaic-section {
-    background: var(--bg-subtle);
-    border: 1px solid var(--border);
-    border-radius: 10px;
-    padding: 12px;
-  }
-  .usage-mosaic-section-title {
-    font-size: 12px;
-    font-weight: 600;
-    margin-bottom: 10px;
-    display: flex;
-    align-items: center;
-    justify-content: space-between;
-  }
-  .usage-mosaic-total {
-    font-size: 20px;
-    font-weight: 700;
-  }
-  .usage-daypart-grid {
-    display: grid;
-    grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
-    gap: 8px;
-  }
-  .usage-daypart-cell {
-    border-radius: 8px;
-    padding: 10px;
-    color: var(--text);
-    background: rgba(255, 77, 77, 0.08);
-    border: 1px solid rgba(255, 77, 77, 0.2);
-    display: flex;
-    flex-direction: column;
-    gap: 4px;
-  }
-  .usage-daypart-label {
-    font-size: 12px;
-    font-weight: 600;
-  }
-  .usage-daypart-value {
-    font-size: 14px;
-  }
-  .usage-hour-grid {
-    display: grid;
-    grid-template-columns: repeat(24, minmax(6px, 1fr));
-    gap: 4px;
-  }
-  .usage-hour-cell {
-    height: 28px;
-    border-radius: 6px;
-    background: rgba(255, 77, 77, 0.1);
-    border: 1px solid rgba(255, 77, 77, 0.2);
-    cursor: pointer;
-    transition: border-color 0.15s, box-shadow 0.15s;
-  }
-  .usage-hour-cell.selected {
-    border-color: rgba(255, 77, 77, 0.8);
-    box-shadow: 0 0 0 2px rgba(255, 77, 77, 0.2);
-  }
-  .usage-hour-labels {
-    display: grid;
-    grid-template-columns: repeat(6, minmax(0, 1fr));
-    gap: 6px;
-    margin-top: 8px;
-    font-size: 11px;
-    color: var(--text-muted);
-  }
-  .usage-hour-legend {
-    display: flex;
-    gap: 8px;
-    align-items: center;
-    margin-top: 10px;
-    font-size: 11px;
-    color: var(--text-muted);
-  }
-  .usage-hour-legend span {
-    display: inline-block;
-    width: 14px;
-    height: 10px;
-    border-radius: 4px;
-    background: rgba(255, 77, 77, 0.15);
-    border: 1px solid rgba(255, 77, 77, 0.2);
-  }
-  .usage-calendar-labels {
-    display: grid;
-    grid-template-columns: repeat(7, minmax(10px, 1fr));
-    gap: 6px;
-    font-size: 10px;
-    color: var(--text-muted);
-    margin-bottom: 6px;
-  }
-  .usage-calendar {
-    display: grid;
-    grid-template-columns: repeat(7, minmax(10px, 1fr));
-    gap: 6px;
-  }
-  .usage-calendar-cell {
-    height: 18px;
-    border-radius: 4px;
-    border: 1px solid rgba(255, 77, 77, 0.2);
-    background: rgba(255, 77, 77, 0.08);
-  }
-  .usage-calendar-cell.empty {
-    background: transparent;
-    border-color: transparent;
-  }
-  .usage-summary-title {
-    font-size: 11px;
-    color: var(--text-muted);
-    margin-bottom: 6px;
-    display: inline-flex;
-    align-items: center;
-    gap: 6px;
-  }
-  .usage-info {
-    display: inline-flex;
-    align-items: center;
-    justify-content: center;
-    width: 16px;
-    height: 16px;
-    margin-left: 6px;
-    border-radius: 999px;
-    border: 1px solid var(--border);
-    background: var(--bg);
-    font-size: 10px;
-    color: var(--text-muted);
-    cursor: help;
-  }
-  .usage-summary-value {
-    font-size: 16px;
-    font-weight: 600;
-    color: var(--text-strong);
-  }
-  .usage-summary-value.good {
-    color: #1f8f4e;
-  }
-  .usage-summary-value.warn {
-    color: #c57a00;
-  }
-  .usage-summary-value.bad {
-    color: #c9372c;
-  }
-  .usage-summary-hint {
-    font-size: 10px;
-    color: var(--text-muted);
-    cursor: help;
-    border: 1px solid var(--border);
-    border-radius: 999px;
-    padding: 0 6px;
-    line-height: 16px;
-    height: 16px;
-    display: inline-flex;
-    align-items: center;
-    justify-content: center;
-  }
-  .usage-summary-sub {
-    font-size: 11px;
-    color: var(--text-muted);
-    margin-top: 4px;
-  }
-  .usage-list {
-    display: flex;
-    flex-direction: column;
-    gap: 8px;
-  }
-  .usage-list-item {
-    display: flex;
-    justify-content: space-between;
-    gap: 12px;
-    font-size: 12px;
-    color: var(--text);
-    align-items: flex-start;
-  }
-  .usage-list-value {
-    display: flex;
-    flex-direction: column;
-    align-items: flex-end;
-    gap: 2px;
-    text-align: right;
-  }
-  .usage-list-sub {
-    font-size: 11px;
-    color: var(--text-muted);
-  }
-  .usage-list-item.button {
-    border: none;
-    background: transparent;
-    padding: 0;
-    text-align: left;
-    cursor: pointer;
-  }
-  .usage-list-item.button:hover {
-    color: var(--text-strong);
-  }
-  .usage-list-item .muted {
-    font-size: 11px;
-  }
-  .usage-error-list {
-    display: flex;
-    flex-direction: column;
-    gap: 10px;
-  }
-  .usage-error-row {
-    display: grid;
-    grid-template-columns: 1fr auto;
-    gap: 8px;
-    align-items: center;
-    font-size: 12px;
-  }
-  .usage-error-date {
-    font-weight: 600;
-  }
-  .usage-error-rate {
-    font-variant-numeric: tabular-nums;
-  }
-  .usage-error-sub {
-    grid-column: 1 / -1;
-    font-size: 11px;
-    color: var(--text-muted);
-  }
-  .usage-badges {
-    display: flex;
-    flex-wrap: wrap;
-    gap: 6px;
-    margin-bottom: 8px;
-  }
-  .usage-badge {
-    display: inline-flex;
-    align-items: center;
-    gap: 6px;
-    padding: 2px 8px;
-    border: 1px solid var(--border);
-    border-radius: 999px;
-    font-size: 11px;
-    background: var(--bg);
-    color: var(--text);
-  }
-  .usage-meta-grid {
-    display: grid;
-    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
-    gap: 12px;
-  }
-  .usage-meta-item {
-    display: flex;
-    flex-direction: column;
-    gap: 4px;
-    font-size: 12px;
-  }
-  .usage-meta-item span {
-    color: var(--text-muted);
-    font-size: 11px;
-  }
-  .usage-insights-grid {
-    display: grid;
-    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
-    gap: 16px;
-    margin-top: 12px;
-  }
-  .usage-insight-card {
-    padding: 14px;
-    border-radius: 10px;
-    border: 1px solid var(--border);
-    background: var(--bg-secondary);
-  }
-  .usage-insight-title {
-    font-size: 12px;
-    font-weight: 600;
-    margin-bottom: 10px;
-  }
-  .usage-insight-subtitle {
-    font-size: 11px;
-    color: var(--text-muted);
-    margin-top: 6px;
-  }
-  /* ===== CHART TOGGLE ===== */
-  .chart-toggle {
-    display: flex;
-    background: var(--bg);
-    border-radius: 6px;
-    overflow: hidden;
-    border: 1px solid var(--border);
-  }
-  .chart-toggle .toggle-btn {
-    padding: 6px 14px;
-    font-size: 13px;
-    background: transparent;
-    border: none;
-    color: var(--text-muted);
-    cursor: pointer;
-    transition: all 0.15s;
-  }
-  .chart-toggle .toggle-btn:hover {
-    color: var(--text);
-  }
-  .chart-toggle .toggle-btn.active {
-    background: #ff4d4d;
-    color: white;
-  }
-  .chart-toggle.small .toggle-btn {
-    padding: 4px 8px;
-    font-size: 11px;
-  }
-  .sessions-toggle {
-    border-radius: 4px;
-  }
-  .sessions-toggle .toggle-btn {
-    border-radius: 4px;
-  }
-  .daily-chart-header {
-    display: flex;
-    align-items: center;
-    justify-content: flex-start;
-    gap: 8px;
-    margin-bottom: 6px;
-  }
+import { usageStylesPart1 } from "./usage-styles/usageStyles-part1.ts";
+import { usageStylesPart2 } from "./usage-styles/usageStyles-part2.ts";
+import { usageStylesPart3 } from "./usage-styles/usageStyles-part3.ts";
 
-  /* ===== DAILY BAR CHART ===== */
-  .daily-chart {
-    margin-top: 12px;
-  }
-  .daily-chart-bars {
-    display: flex;
-    align-items: flex-end;
-    height: 200px;
-    gap: 4px;
-    padding: 8px 4px 36px;
-  }
-  .daily-bar-wrapper {
-    flex: 1;
-    display: flex;
-    flex-direction: column;
-    align-items: center;
-    height: 100%;
-    justify-content: flex-end;
-    cursor: pointer;
-    position: relative;
-    border-radius: 4px 4px 0 0;
-    transition: background 0.15s;
-    min-width: 0;
-  }
-  .daily-bar-wrapper:hover {
-    background: var(--bg-hover);
-  }
-  .daily-bar-wrapper.selected {
-    background: var(--accent-subtle);
-  }
-  .daily-bar-wrapper.selected .daily-bar {
-    background: var(--accent);
-  }
-  .daily-bar {
-    width: 100%;
-    max-width: var(--bar-max-width, 32px);
-    background: #ff4d4d;
-    border-radius: 3px 3px 0 0;
-    min-height: 2px;
-    transition: all 0.15s;
-    overflow: hidden;
-  }
-  .daily-bar-wrapper:hover .daily-bar {
-    background: #cc3d3d;
-  }
-  .daily-bar-label {
-    position: absolute;
-    bottom: -28px;
-    font-size: 10px;
-    color: var(--text-muted);
-    white-space: nowrap;
-    text-align: center;
-    transform: rotate(-35deg);
-    transform-origin: top center;
-  }
-  .daily-bar-total {
-    position: absolute;
-    top: -16px;
-    left: 50%;
-    transform: translateX(-50%);
-    font-size: 10px;
-    color: var(--text-muted);
-    white-space: nowrap;
-  }
-  .daily-bar-tooltip {
-    position: absolute;
-    bottom: calc(100% + 8px);
-    left: 50%;
-    transform: translateX(-50%);
-    background: var(--bg);
-    border: 1px solid var(--border);
-    border-radius: 6px;
-    padding: 8px 12px;
-    font-size: 12px;
-    white-space: nowrap;
-    z-index: 100;
-    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
-    pointer-events: none;
-    opacity: 0;
-    transition: opacity 0.15s;
-  }
-  .daily-bar-wrapper:hover .daily-bar-tooltip {
-    opacity: 1;
-  }
-
-  /* ===== COST/TOKEN BREAKDOWN BAR ===== */
-  .cost-breakdown {
-    margin-top: 18px;
-    padding: 16px;
-    background: var(--bg-secondary);
-    border-radius: 8px;
-  }
-  .cost-breakdown-header {
-    font-weight: 600;
-    font-size: 15px;
-    letter-spacing: -0.02em;
-    margin-bottom: 12px;
-    color: var(--text-strong);
-  }
-  .cost-breakdown-bar {
-    height: 28px;
-    background: var(--bg);
-    border-radius: 6px;
-    overflow: hidden;
-    display: flex;
-  }
-  .cost-segment {
-    height: 100%;
-    transition: width 0.3s ease;
-    position: relative;
-  }
-  .cost-segment.output {
-    background: #ef4444;
-  }
-  .cost-segment.input {
-    background: #f59e0b;
-  }
-  .cost-segment.cache-write {
-    background: #10b981;
-  }
-  .cost-segment.cache-read {
-    background: #06b6d4;
-  }
-  .cost-breakdown-legend {
-    display: flex;
-    flex-wrap: wrap;
-    gap: 16px;
-    margin-top: 12px;
-  }
-  .cost-breakdown-total {
-    margin-top: 10px;
-    font-size: 12px;
-    color: var(--text-muted);
-  }
-  .legend-item {
-    display: flex;
-    align-items: center;
-    gap: 6px;
-    font-size: 12px;
-    color: var(--text);
-    cursor: help;
-  }
-  .legend-dot {
-    width: 10px;
-    height: 10px;
-    border-radius: 2px;
-    flex-shrink: 0;
-  }
-  .legend-dot.output {
-    background: #ef4444;
-  }
-  .legend-dot.input {
-    background: #f59e0b;
-  }
-  .legend-dot.cache-write {
-    background: #10b981;
-  }
-  .legend-dot.cache-read {
-    background: #06b6d4;
-  }
-  .legend-dot.system {
-    background: #ff4d4d;
-  }
-  .legend-dot.skills {
-    background: #8b5cf6;
-  }
-  .legend-dot.tools {
-    background: #ec4899;
-  }
-  .legend-dot.files {
-    background: #f59e0b;
-  }
-  .cost-breakdown-note {
-    margin-top: 10px;
-    font-size: 11px;
-    color: var(--text-muted);
-    line-height: 1.4;
-  }
-
-  /* ===== SESSION BARS (scrollable list) ===== */
-  .session-bars {
-    margin-top: 16px;
-    max-height: 400px;
-    overflow-y: auto;
-    border: 1px solid var(--border);
-    border-radius: 8px;
-    background: var(--bg);
-  }
-  .session-bar-row {
-    display: flex;
-    align-items: center;
-    gap: 12px;
-    padding: 10px 14px;
-    border-bottom: 1px solid var(--border);
-    cursor: pointer;
-    transition: background 0.15s;
-  }
-  .session-bar-row:last-child {
-    border-bottom: none;
-  }
-  .session-bar-row:hover {
-    background: var(--bg-hover);
-  }
-  .session-bar-row.selected {
-    background: var(--accent-subtle);
-  }
-  .session-bar-label {
-    flex: 1 1 auto;
-    min-width: 0;
-    font-size: 13px;
-    color: var(--text);
-    display: flex;
-    flex-direction: column;
-    gap: 2px;
-  }
-  .session-bar-title {
-    /* Prefer showing the full name; wrap instead of truncating. */
-    white-space: normal;
-    overflow-wrap: anywhere;
-    word-break: break-word;
-  }
-  .session-bar-meta {
-    font-size: 10px;
-    color: var(--text-muted);
-    font-weight: 400;
-    overflow: hidden;
-    text-overflow: ellipsis;
-    white-space: nowrap;
-  }
-  .session-bar-track {
-    flex: 0 0 90px;
-    height: 6px;
-    background: var(--bg-secondary);
-    border-radius: 4px;
-    overflow: hidden;
-    opacity: 0.6;
-  }
-  .session-bar-fill {
-    height: 100%;
-    background: rgba(255, 77, 77, 0.7);
-    border-radius: 4px;
-    transition: width 0.3s ease;
-  }
-  .session-bar-value {
-    flex: 0 0 70px;
-    text-align: right;
-    font-size: 12px;
-    font-family: var(--font-mono);
-    color: var(--text-muted);
-  }
-  .session-bar-actions {
-    display: inline-flex;
-    align-items: center;
-    gap: 8px;
-    flex: 0 0 auto;
-  }
-  .session-copy-btn {
-    height: 26px;
-    padding: 0 10px;
-    border-radius: 999px;
-    border: 1px solid var(--border);
-    background: var(--bg-secondary);
-    font-size: 11px;
-    font-weight: 600;
-    color: var(--text-muted);
-    cursor: pointer;
-    transition: background 0.15s, border-color 0.15s, color 0.15s;
-  }
-  .session-copy-btn:hover {
-    background: var(--bg);
-    border-color: var(--border-strong);
-    color: var(--text);
-  }
-
-  /* ===== TIME SERIES CHART ===== */
-  .session-timeseries {
-    margin-top: 24px;
-    padding: 16px;
-    background: var(--bg-secondary);
-    border-radius: 8px;
-  }
-  .timeseries-header-row {
-    display: flex;
-    justify-content: space-between;
-    align-items: center;
-    margin-bottom: 12px;
-  }
-  .timeseries-controls {
-    display: flex;
-    gap: 6px;
-    align-items: center;
-  }
-  .timeseries-header {
-    font-weight: 600;
-    color: var(--text);
-  }
-  .timeseries-chart {
-    width: 100%;
-    overflow: hidden;
-  }
-  .timeseries-svg {
-    width: 100%;
-    height: auto;
-    display: block;
-  }
-  .timeseries-svg .axis-label {
-    font-size: 10px;
-    fill: var(--text-muted);
-  }
-  .timeseries-svg .ts-area {
-    fill: #ff4d4d;
-    fill-opacity: 0.1;
-  }
-  .timeseries-svg .ts-line {
-    fill: none;
-    stroke: #ff4d4d;
-    stroke-width: 2;
-  }
-  .timeseries-svg .ts-dot {
-    fill: #ff4d4d;
-    transition: r 0.15s, fill 0.15s;
-  }
-  .timeseries-svg .ts-dot:hover {
-    r: 5;
-  }
-  .timeseries-svg .ts-bar {
-    fill: #ff4d4d;
-    transition: fill 0.15s;
-  }
-  .timeseries-svg .ts-bar:hover {
-    fill: #cc3d3d;
-  }
-  .timeseries-svg .ts-bar.output { fill: #ef4444; }
-  .timeseries-svg .ts-bar.input { fill: #f59e0b; }
-  .timeseries-svg .ts-bar.cache-write { fill: #10b981; }
-  .timeseries-svg .ts-bar.cache-read { fill: #06b6d4; }
-  .timeseries-summary {
-    margin-top: 12px;
-    font-size: 13px;
-    color: var(--text-muted);
-    display: flex;
-    flex-wrap: wrap;
-    gap: 8px;
-  }
-  .timeseries-loading {
-    padding: 24px;
-    text-align: center;
-    color: var(--text-muted);
-  }
-
-  /* ===== SESSION LOGS ===== */
-  .session-logs {
-    margin-top: 24px;
-    background: var(--bg-secondary);
-    border-radius: 8px;
-    overflow: hidden;
-  }
-  .session-logs-header {
-    padding: 10px 14px;
-    font-weight: 600;
-    border-bottom: 1px solid var(--border);
-    display: flex;
-    justify-content: space-between;
-    align-items: center;
-    font-size: 13px;
-    background: var(--bg-secondary);
-  }
-  .session-logs-loading {
-    padding: 24px;
-    text-align: center;
-    color: var(--text-muted);
-  }
-  .session-logs-list {
-    max-height: 400px;
-    overflow-y: auto;
-  }
-  .session-log-entry {
-    padding: 10px 14px;
-    border-bottom: 1px solid var(--border);
-    display: flex;
-    flex-direction: column;
-    gap: 6px;
-    background: var(--bg);
-  }
-  .session-log-entry:last-child {
-    border-bottom: none;
-  }
-  .session-log-entry.user {
-    border-left: 3px solid var(--accent);
-  }
-  .session-log-entry.assistant {
-    border-left: 3px solid var(--border-strong);
-  }
-  .session-log-meta {
-    display: flex;
-    gap: 8px;
-    align-items: center;
-    font-size: 11px;
-    color: var(--text-muted);
-    flex-wrap: wrap;
-  }
-  .session-log-role {
-    font-weight: 600;
-    text-transform: uppercase;
-    letter-spacing: 0.04em;
-    font-size: 10px;
-    padding: 2px 6px;
-    border-radius: 999px;
-    background: var(--bg-secondary);
-    border: 1px solid var(--border);
-  }
-  .session-log-entry.user .session-log-role {
-    color: var(--accent);
-  }
-  .session-log-entry.assistant .session-log-role {
-    color: var(--text-muted);
-  }
-  .session-log-content {
-    font-size: 13px;
-    line-height: 1.5;
-    color: var(--text);
-    white-space: pre-wrap;
-    word-break: break-word;
-    background: var(--bg-secondary);
-    border-radius: 8px;
-    padding: 8px 10px;
-    border: 1px solid var(--border);
-    max-height: 220px;
-    overflow-y: auto;
-  }
-
-  /* ===== CONTEXT WEIGHT BREAKDOWN ===== */
-  .context-weight-breakdown {
-    margin-top: 24px;
-    padding: 16px;
-    background: var(--bg-secondary);
-    border-radius: 8px;
-  }
-  .context-weight-breakdown .context-weight-header {
-    font-weight: 600;
-    font-size: 13px;
-    margin-bottom: 4px;
-    color: var(--text);
-  }
-  .context-weight-desc {
-    font-size: 12px;
-    color: var(--text-muted);
-    margin: 0 0 12px 0;
-  }
-  .context-stacked-bar {
-    height: 24px;
-    background: var(--bg);
-    border-radius: 6px;
-    overflow: hidden;
-    display: flex;
-  }
-  .context-segment {
-    height: 100%;
-    transition: width 0.3s ease;
-  }
-  .context-segment.system {
-    background: #ff4d4d;
-  }
-  .context-segment.skills {
-    background: #8b5cf6;
-  }
-  .context-segment.tools {
-    background: #ec4899;
-  }
-  .context-segment.files {
-    background: #f59e0b;
-  }
-  .context-legend {
-    display: flex;
-    flex-wrap: wrap;
-    gap: 16px;
-    margin-top: 12px;
-  }
-  .context-total {
-    margin-top: 10px;
-    font-size: 12px;
-    font-weight: 600;
-    color: var(--text-muted);
-  }
-  .context-details {
-    margin-top: 12px;
-    border: 1px solid var(--border);
-    border-radius: 6px;
-    overflow: hidden;
-  }
-  .context-details summary {
-    padding: 10px 14px;
-    font-size: 13px;
-    font-weight: 500;
-    cursor: pointer;
-    background: var(--bg);
-    border-bottom: 1px solid var(--border);
-  }
-  .context-details[open] summary {
-    border-bottom: 1px solid var(--border);
-  }
-  .context-list {
-    max-height: 200px;
-    overflow-y: auto;
-  }
-  .context-list-header {
-    display: flex;
-    justify-content: space-between;
-    padding: 8px 14px;
-    font-size: 11px;
-    text-transform: uppercase;
-    color: var(--text-muted);
-    background: var(--bg-secondary);
-    border-bottom: 1px solid var(--border);
-  }
-  .context-list-item {
-    display: flex;
-    justify-content: space-between;
-    padding: 8px 14px;
-    font-size: 12px;
-    border-bottom: 1px solid var(--border);
-  }
-  .context-list-item:last-child {
-    border-bottom: none;
-  }
-  .context-list-item .mono {
-    font-family: var(--font-mono);
-    color: var(--text);
-  }
-  .context-list-item .muted {
-    color: var(--text-muted);
-    font-family: var(--font-mono);
-  }
-
-  /* ===== NO CONTEXT NOTE ===== */
-  .no-context-note {
-    margin-top: 24px;
-    padding: 16px;
-    background: var(--bg-secondary);
-    border-radius: 8px;
-    font-size: 13px;
-    color: var(--text-muted);
-    line-height: 1.5;
-  }
-
-  /* ===== TWO COLUMN LAYOUT ===== */
-  .usage-grid {
-    display: grid;
-    grid-template-columns: 1fr 1fr;
-    gap: 18px;
-    margin-top: 18px;
-    align-items: stretch;
-  }
-  .usage-grid-left {
-    display: flex;
-    flex-direction: column;
-  }
-  .usage-grid-right {
-    display: flex;
-    flex-direction: column;
-  }
-  
-  /* ===== LEFT CARD (Daily + Breakdown) ===== */
-  .usage-left-card {
-    /* inherits background, border, shadow from .card */
-    flex: 1;
-    display: flex;
-    flex-direction: column;
-  }
-  .usage-left-card .daily-chart-bars {
-    flex: 1;
-    min-height: 200px;
-  }
-  .usage-left-card .sessions-panel-title {
-    font-weight: 600;
-    font-size: 14px;
-    margin-bottom: 12px;
-  }
-  
-  /* ===== COMPACT DAILY CHART ===== */
-  .daily-chart-compact {
-    margin-bottom: 16px;
-  }
-  .daily-chart-compact .sessions-panel-title {
-    margin-bottom: 8px;
-  }
-  .daily-chart-compact .daily-chart-bars {
-    height: 100px;
-    padding-bottom: 20px;
-  }
-  
-  /* ===== COMPACT COST BREAKDOWN ===== */
-  .cost-breakdown-compact {
-    padding: 0;
-    margin: 0;
-    background: transparent;
-    border-top: 1px solid var(--border);
-    padding-top: 12px;
-  }
-  .cost-breakdown-compact .cost-breakdown-header {
-    margin-bottom: 8px;
-  }
-  .cost-breakdown-compact .cost-breakdown-legend {
-    gap: 12px;
-  }
-  .cost-breakdown-compact .cost-breakdown-note {
-    display: none;
-  }
-  
-  /* ===== SESSIONS CARD ===== */
-  .sessions-card {
-    /* inherits background, border, shadow from .card */
-    flex: 1;
-    display: flex;
-    flex-direction: column;
-  }
-  .sessions-card-header {
-    display: flex;
-    justify-content: space-between;
-    align-items: center;
-    margin-bottom: 8px;
-  }
-  .sessions-card-title {
-    font-weight: 600;
-    font-size: 14px;
-  }
-  .sessions-card-count {
-    font-size: 12px;
-    color: var(--text-muted);
-  }
-  .sessions-card-meta {
-    display: flex;
-    align-items: center;
-    justify-content: space-between;
-    gap: 12px;
-    margin: 8px 0 10px;
-    font-size: 12px;
-    color: var(--text-muted);
-  }
-  .sessions-card-stats {
-    display: inline-flex;
-    gap: 12px;
-  }
-  .sessions-sort {
-    display: inline-flex;
-    align-items: center;
-    gap: 6px;
-    font-size: 12px;
-    color: var(--text-muted);
-  }
-  .sessions-sort select {
-    padding: 4px 8px;
-    border-radius: 6px;
-    border: 1px solid var(--border);
-    background: var(--bg);
-    color: var(--text);
-    font-size: 12px;
-  }
-  .sessions-action-btn {
-    height: 28px;
-    padding: 0 10px;
-    border-radius: 8px;
-    font-size: 12px;
-    line-height: 1;
-  }
-  .sessions-action-btn.icon {
-    width: 32px;
-    padding: 0;
-    display: inline-flex;
-    align-items: center;
-    justify-content: center;
-  }
-  .sessions-card-hint {
-    font-size: 11px;
-    color: var(--text-muted);
-    margin-bottom: 8px;
-  }
-  .sessions-card .session-bars {
-    max-height: 280px;
-    background: var(--bg);
-    border-radius: 6px;
-    border: 1px solid var(--border);
-    margin: 0;
-    overflow-y: auto;
-    padding: 8px;
-  }
-  .sessions-card .session-bar-row {
-    padding: 6px 8px;
-    border-radius: 6px;
-    margin-bottom: 3px;
-    border: 1px solid transparent;
-    transition: all 0.15s;
-  }
-  .sessions-card .session-bar-row:hover {
-    border-color: var(--border);
-    background: var(--bg-hover);
-  }
-  .sessions-card .session-bar-row.selected {
-    border-color: var(--accent);
-    background: var(--accent-subtle);
-    box-shadow: inset 0 0 0 1px rgba(255, 77, 77, 0.15);
-  }
-  .sessions-card .session-bar-label {
-    flex: 1 1 auto;
-    min-width: 140px;
-    font-size: 12px;
-  }
-  .sessions-card .session-bar-value {
-    flex: 0 0 60px;
-    font-size: 11px;
-    font-weight: 600;
-  }
-  .sessions-card .session-bar-track {
-    flex: 0 0 70px;
-    height: 5px;
-    opacity: 0.5;
-  }
-  .sessions-card .session-bar-fill {
-    background: rgba(255, 77, 77, 0.55);
-  }
-  .sessions-clear-btn {
-    margin-left: auto;
-  }
-  
-  /* ===== EMPTY DETAIL STATE ===== */
-  .session-detail-empty {
-    margin-top: 18px;
-    background: var(--bg-secondary);
-    border-radius: 8px;
-    border: 2px dashed var(--border);
-    padding: 32px;
-    text-align: center;
-  }
-  .session-detail-empty-title {
-    font-size: 15px;
-    font-weight: 600;
-    color: var(--text);
-    margin-bottom: 8px;
-  }
-  .session-detail-empty-desc {
-    font-size: 13px;
-    color: var(--text-muted);
-    margin-bottom: 16px;
-    line-height: 1.5;
-  }
-  .session-detail-empty-features {
-    display: flex;
-    justify-content: center;
-    gap: 24px;
-    flex-wrap: wrap;
-  }
-  .session-detail-empty-feature {
-    display: flex;
-    align-items: center;
-    gap: 6px;
-    font-size: 12px;
-    color: var(--text-muted);
-  }
-  .session-detail-empty-feature .icon {
-    font-size: 16px;
-  }
-  
-  /* ===== SESSION DETAIL PANEL ===== */
-  .session-detail-panel {
-    margin-top: 12px;
-    /* inherits background, border-radius, shadow from .card */
-    border: 2px solid var(--accent) !important;
-  }
-  .session-detail-header {
-    display: flex;
-    justify-content: space-between;
-    align-items: center;
-    padding: 8px 12px;
-    border-bottom: 1px solid var(--border);
-    cursor: pointer;
-  }
-  .session-detail-header:hover {
-    background: var(--bg-hover);
-  }
-  .session-detail-title {
-    font-weight: 600;
-    font-size: 14px;
-    display: flex;
-    align-items: center;
-    gap: 8px;
-  }
-  .session-detail-header-left {
-    display: flex;
-    align-items: center;
-    gap: 8px;
-  }
-  .session-close-btn {
-    background: var(--bg);
-    border: 1px solid var(--border);
-    color: var(--text);
-    cursor: pointer;
-    padding: 2px 8px;
-    font-size: 16px;
-    line-height: 1;
-    border-radius: 4px;
-    transition: background 0.15s, color 0.15s;
-  }
-  .session-close-btn:hover {
-    background: var(--bg-hover);
-    color: var(--text);
-    border-color: var(--accent);
-  }
-  .session-detail-stats {
-    display: flex;
-    gap: 10px;
-    font-size: 12px;
-    color: var(--text-muted);
-  }
-  .session-detail-stats strong {
-    color: var(--text);
-    font-family: var(--font-mono);
-  }
-  .session-detail-content {
-    padding: 12px;
-  }
-  .session-summary-grid {
-    display: grid;
-    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
-    gap: 8px;
-    margin-bottom: 12px;
-  }
-  .session-summary-card {
-    border: 1px solid var(--border);
-    border-radius: 8px;
-    padding: 8px;
-    background: var(--bg-secondary);
-  }
-  .session-summary-title {
-    font-size: 11px;
-    color: var(--text-muted);
-    margin-bottom: 4px;
-  }
-  .session-summary-value {
-    font-size: 14px;
-    font-weight: 600;
-  }
-  .session-summary-meta {
-    font-size: 11px;
-    color: var(--text-muted);
-    margin-top: 4px;
-  }
-  .session-detail-row {
-    display: grid;
-    grid-template-columns: 1fr;
-    gap: 10px;
-    /* Separate "Usage Over Time" from the summary + Top Tools/Model Mix cards above. */
-    margin-top: 12px;
-    margin-bottom: 10px;
-  }
-  .session-detail-bottom {
-    display: grid;
-    grid-template-columns: minmax(0, 1.8fr) minmax(0, 1fr);
-    gap: 10px;
-    align-items: stretch;
-  }
-  .session-detail-bottom .session-logs-compact {
-    margin: 0;
-    display: flex;
-    flex-direction: column;
-  }
-  .session-detail-bottom .session-logs-compact .session-logs-list {
-    flex: 1 1 auto;
-    max-height: none;
-  }
-  .context-details-panel {
-    display: flex;
-    flex-direction: column;
-    gap: 8px;
-    background: var(--bg);
-    border-radius: 6px;
-    border: 1px solid var(--border);
-    padding: 12px;
-  }
-  .context-breakdown-grid {
-    display: grid;
-    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
-    gap: 10px;
-    margin-top: 8px;
-  }
-  .context-breakdown-card {
-    border: 1px solid var(--border);
-    border-radius: 8px;
-    padding: 8px;
-    background: var(--bg-secondary);
-  }
-  .context-breakdown-title {
-    font-size: 11px;
-    font-weight: 600;
-    margin-bottom: 6px;
-  }
-  .context-breakdown-list {
-    display: flex;
-    flex-direction: column;
-    gap: 6px;
-    font-size: 11px;
-  }
-  .context-breakdown-item {
-    display: flex;
-    justify-content: space-between;
-    gap: 8px;
-  }
-  .context-breakdown-more {
-    font-size: 10px;
-    color: var(--text-muted);
-    margin-top: 4px;
-  }
-  .context-breakdown-header {
-    display: flex;
-    align-items: center;
-    justify-content: space-between;
-    gap: 12px;
-  }
-  .context-expand-btn {
-    border: 1px solid var(--border);
-    background: var(--bg-secondary);
-    color: var(--text-muted);
-    font-size: 11px;
-    padding: 4px 8px;
-    border-radius: 999px;
-    cursor: pointer;
-    transition: all 0.15s;
-  }
-  .context-expand-btn:hover {
-    color: var(--text);
-    border-color: var(--border-strong);
-    background: var(--bg);
-  }
-  
-  /* ===== COMPACT TIMESERIES ===== */
-  .session-timeseries-compact {
-    background: var(--bg);
-    border-radius: 6px;
-    border: 1px solid var(--border);
-    padding: 12px;
-    margin: 0;
-  }
-  .session-timeseries-compact .timeseries-header-row {
-    margin-bottom: 8px;
-  }
-  .session-timeseries-compact .timeseries-header {
-    font-size: 12px;
-  }
-  .session-timeseries-compact .timeseries-summary {
-    font-size: 11px;
-    margin-top: 8px;
-  }
-  
-  /* ===== COMPACT CONTEXT ===== */
-  .context-weight-compact {
-    background: var(--bg);
-    border-radius: 6px;
-    border: 1px solid var(--border);
-    padding: 12px;
-    margin: 0;
-  }
-  .context-weight-compact .context-weight-header {
-    font-size: 12px;
-    margin-bottom: 4px;
-  }
-  .context-weight-compact .context-weight-desc {
-    font-size: 11px;
-    margin-bottom: 8px;
-  }
-  .context-weight-compact .context-stacked-bar {
-    height: 16px;
-  }
-  .context-weight-compact .context-legend {
-    font-size: 11px;
-    gap: 10px;
-    margin-top: 8px;
-  }
-  .context-weight-compact .context-total {
-    font-size: 11px;
-    margin-top: 6px;
-  }
-  .context-weight-compact .context-details {
-    margin-top: 8px;
-  }
-  .context-weight-compact .context-details summary {
-    font-size: 12px;
-    padding: 6px 10px;
-  }
-  
-  /* ===== COMPACT LOGS ===== */
-  .session-logs-compact {
-    background: var(--bg);
-    border-radius: 10px;
-    border: 1px solid var(--border);
-    overflow: hidden;
-    margin: 0;
-    display: flex;
-    flex-direction: column;
-  }
-  .session-logs-compact .session-logs-header {
-    padding: 10px 12px;
-    font-size: 12px;
-  }
-  .session-logs-compact .session-logs-list {
-    max-height: none;
-    flex: 1 1 auto;
-    overflow: auto;
-  }
-  .session-logs-compact .session-log-entry {
-    padding: 8px 12px;
-  }
-  .session-logs-compact .session-log-content {
-    font-size: 12px;
-    max-height: 160px;
-  }
-  .session-log-tools {
-    margin-top: 6px;
-    border: 1px solid var(--border);
-    border-radius: 8px;
-    background: var(--bg-secondary);
-    padding: 6px 8px;
-    font-size: 11px;
-    color: var(--text);
-  }
-  .session-log-tools summary {
-    cursor: pointer;
-    list-style: none;
-    display: flex;
-    align-items: center;
-    gap: 6px;
-    font-weight: 600;
-  }
-  .session-log-tools summary::-webkit-details-marker {
-    display: none;
-  }
-  .session-log-tools-list {
-    margin-top: 6px;
-    display: flex;
-    flex-wrap: wrap;
-    gap: 6px;
-  }
-  .session-log-tools-pill {
-    border: 1px solid var(--border);
-    border-radius: 999px;
-    padding: 2px 8px;
-    font-size: 10px;
-    background: var(--bg);
-    color: var(--text);
-  }
-
-  /* ===== RESPONSIVE ===== */
-  @media (max-width: 900px) {
-    .usage-grid {
-      grid-template-columns: 1fr;
-    }
-    .session-detail-row {
-      grid-template-columns: 1fr;
-    }
-  }
-  @media (max-width: 600px) {
-    .session-bar-label {
-      flex: 0 0 100px;
-    }
-    .cost-breakdown-legend {
-      gap: 10px;
-    }
-    .legend-item {
-      font-size: 11px;
-    }
-    .daily-chart-bars {
-      height: 170px;
-      gap: 6px;
-      padding-bottom: 40px;
-    }
-    .daily-bar-label {
-      font-size: 8px;
-      bottom: -30px;
-      transform: rotate(-45deg);
-    }
-    .usage-mosaic-grid {
-      grid-template-columns: 1fr;
-    }
-    .usage-hour-grid {
-      grid-template-columns: repeat(12, minmax(10px, 1fr));
-    }
-    .usage-hour-cell {
-      height: 22px;
-    }
-  }
-`;
+export const usageStylesString = [usageStylesPart1, usageStylesPart2, usageStylesPart3].join("\n");