.chat-interface {
    display: flex;
    flex-direction: column;
    height: 100% !important;
    max-height: 100%;
    max-width: 100%;
    margin: 0;
    background: linear-gradient(165deg, #ffffff 0%, var(--neutral-50) 100%);
    box-shadow: none;
    border-radius: 0;
    padding: var(--space-2) var(--space-1);
}

.chat-top-bar {
    grid-row: 1;
    grid-column: 1 / 4;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3) var(--space-1);
    background: #f9fafb;
    border-bottom: 1px solid var(--neutral-200);
}

.agent-right-panel {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
}

/* Tablet */
@media (max-width: 1024px) {
    body {
        padding: 0;
    }
    .chat-interface {
        max-width: 100%;
        height: 100%;
        border-radius: 0;
        padding: var(--space-2);
    }
}

/* Mobile & small screens */
@media (max-width: 768px) and (pointer: coarse) {
    .chat-interface {
        padding: var(--space-1);
    }
}

/* ========== Token Usage Badge ========== */
.usage-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 10px;
    border: 1px solid var(--neutral-200);
    border-radius: var(--radius-md);
    background: #fff;
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--neutral-700);
    transition: border-color 0.15s, box-shadow 0.15s;
    white-space: nowrap;
    margin-left: 0;
}
.usage-badge:hover {
    border-color: var(--neutral-400);
    box-shadow: 0 2px 6px rgba(0,0,0,0.08);
}
.usage-badge-bar {
    width: 48px;
    height: 6px;
    border-radius: 3px;
    background: var(--neutral-100);
    overflow: hidden;
    flex-shrink: 0;
}
.usage-badge-bar-fill {
    height: 100%;
    border-radius: 3px;
    background: var(--color-success);
    width: 0%;
    transition: width 0.4s ease, background 0.3s ease;
}
.usage-badge-bar-fill.usage-warning {
    background: var(--color-warning);
}
.usage-badge-bar-fill.usage-blocked {
    background: var(--color-error);
}
.usage-badge-text {
    color: var(--neutral-600);
    font-variant-numeric: tabular-nums;
}

/* ========== Usage Banner (warning / blocked) ========== */
.usage-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 8px 16px;
    font-size: var(--font-small);
    font-weight: 500;
    border-radius: 0;
    animation: usageBannerSlide 0.25s ease-out;
}
@keyframes usageBannerSlide {
    from { transform: translateY(-100%); opacity: 0; }
    to   { transform: translateY(0);     opacity: 1; }
}
.usage-banner.usage-banner--warning {
    background: #fef3c7;
    color: #92400e;
    border-bottom: 1px solid #fcd34d;
}
.usage-banner.usage-banner--blocked {
    background: var(--color-error-bg);
    color: #991b1b;
    border-bottom: 1px solid #fca5a5;
}
.usage-banner.usage-banner--overage {
    background: #e0f2fe;
    color: #075985;
    border-bottom: 1px solid #7dd3fc;
}
.usage-banner.usage-banner--overage-warning {
    background: #ffedd5;
    color: #9a3412;
    border-bottom: 1px solid #fdba74;
}
.usage-banner-text {
    flex: 1;
}
.usage-banner-action {
    border: 1px solid currentColor;
    background: transparent;
    color: inherit;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 999px;
    padding: 4px 10px;
    cursor: pointer;
}
.usage-banner-action:hover {
    background: rgba(255, 255, 255, 0.35);
}
.usage-banner-close {
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    color: inherit;
    opacity: 0.6;
    line-height: 1;
    padding: 0 2px;
}
.usage-banner-close:hover { opacity: 1; }

/* ========== Usage Detail Popup ========== */
.usage-popup {
    position: absolute;
    top: 48px;
    right: 12px;
    z-index: 100;
    width: 340px;
    max-height: 420px;
    overflow-y: auto;
    background: #fff;
    border: 1px solid var(--neutral-200);
    border-radius: var(--radius-lg);
    box-shadow: 0 12px 32px rgba(0,0,0,0.12), 0 0 0 1px rgba(0,0,0,0.04);
    animation: usagePopupFade 0.15s ease-out;
}
@keyframes usagePopupFade {
    from { opacity: 0; transform: translateY(-6px); }
    to   { opacity: 1; transform: translateY(0); }
}
.usage-popup-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px 10px;
    border-bottom: 1px solid var(--neutral-100);
}
.usage-popup-title {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--neutral-900);
}
.usage-popup-close {
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    color: var(--neutral-400);
    line-height: 1;
    padding: 0 2px;
}
.usage-popup-close:hover { color: var(--neutral-700); }
.usage-popup-body {
    padding: 16px;
}
.usage-popup-progress {
    margin-bottom: 16px;
}
.usage-popup-progress-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.8125rem;
    color: var(--neutral-600);
    margin-bottom: 6px;
}
.usage-popup-progress-bar {
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: var(--neutral-100);
    overflow: hidden;
}
.usage-popup-progress-bar-fill {
    height: 100%;
    border-radius: 4px;
    background: var(--color-success);
    transition: width 0.4s ease, background 0.3s ease;
}
.usage-popup-progress-bar-fill.usage-warning { background: var(--color-warning); }
.usage-popup-progress-bar-fill.usage-blocked { background: var(--color-error); }
.usage-popup-cost {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--neutral-900);
    margin-bottom: 4px;
}
.usage-popup-cost-sub {
    text-align: center;
    font-size: 0.8125rem;
    color: var(--neutral-500);
    margin-bottom: 16px;
}
.usage-popup-models {
    border-top: 1px solid var(--neutral-100);
    padding-top: 12px;
}
.usage-popup-models-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--neutral-400);
    margin-bottom: 8px;
}
.usage-popup-model-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 0;
    font-size: 0.8125rem;
}
.usage-popup-model-name {
    color: var(--neutral-700);
    font-weight: 500;
}
.usage-popup-model-cost {
    color: var(--neutral-500);
    font-variant-numeric: tabular-nums;
}
.usage-popup-model-calls {
    color: var(--neutral-400);
    font-size: 0.75rem;
    margin-left: 6px;
}
.usage-popup-status {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 10px;
    margin-left: 8px;
}
.usage-popup-status.status-ok { background: #dcfce7; color: #166534; }
.usage-popup-status.status-warning { background: #fef3c7; color: #92400e; }
.usage-popup-status.status-blocked { background: #fee2e2; color: #991b1b; }
.usage-popup-actions {
    border-top: 1px solid var(--neutral-100);
    margin-top: 12px;
    padding-top: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.usage-upgrade-btn {
    width: 100%;
    border: 1px solid var(--neutral-200);
    background: #fff;
    color: var(--neutral-800);
    border-radius: var(--radius-md);
    padding: 8px 10px;
    text-align: left;
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
}
.usage-upgrade-btn:hover {
    border-color: var(--color-primary);
    background: var(--neutral-50);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

@media (max-width: 600px) {
    .usage-popup { width: calc(100vw - 24px); right: 12px; left: 12px; }
    .usage-badge-bar { width: 32px; }
}