[hidden] { display: none !important; }
/* Command Center layout, on top of brand.css tokens */
.shell { display: grid; grid-template-columns: 280px 1fr; min-height: 100vh; }
@media (max-width: 900px) { .shell { grid-template-columns: 1fr; } .sidebar { display: none; } }

.sidebar { background: var(--color-surface); border-right: 1px solid var(--color-border); padding: var(--space-md); display: flex; flex-direction: column; gap: var(--space-lg); }
.sidebar nav { display: grid; gap: var(--space-xs); }
.nav-item { display: flex; align-items: center; gap: var(--space-sm); height: var(--control-height); padding: 0 12px; border-radius: var(--radius); color: var(--color-text); font-weight: 500; }
.nav-item:hover { background: var(--color-gray-100); color: var(--color-text-heading); }
.nav-item.active { background: color-mix(in srgb, var(--color-accent) 12%, var(--color-surface)); color: var(--color-accent-hover); }
.nav-group { font-size: 11px; line-height: 16px; font-weight: 500; color: var(--color-text-subtle); letter-spacing: var(--tracking-wide); text-transform: capitalize; margin: var(--space-sm) 12px var(--space-xs); }
.sidebar-footer { margin-top: auto; display: grid; gap: var(--space-sm); font-size: 12px; color: var(--color-text-muted); }

.content { padding: var(--space-lg) var(--space-md); max-width: 1120px; width: 100%; }
@media (min-width: 768px) { .content { padding-left: 20px; padding-right: 20px; } }

.tabs { display: flex; gap: var(--space-lg); border-bottom: 1px solid var(--color-border); margin-bottom: var(--space-md); }
.tab { padding: 10px 0; font-weight: 500; color: var(--color-text-muted); border-bottom: 2px solid transparent; cursor: pointer; background: none; border-top: 0; border-left: 0; border-right: 0; font: inherit; }
.tab:hover { color: var(--color-text-heading); }
.tab.active { color: var(--color-accent-hover); border-bottom-color: var(--color-accent); }

.grid-2 { display: grid; gap: var(--space-md); grid-template-columns: 1fr; }
@media (min-width: 900px) { .grid-2 { grid-template-columns: 1fr 1fr; } }
.metrics { display: grid; gap: var(--space-md); grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); margin-bottom: var(--space-md); }
.metric-value { font-size: 24px; line-height: 32px; font-weight: 600; color: var(--color-text-heading); font-variant-numeric: tabular-nums; }

.form { display: grid; gap: var(--space-md); }
.form-row { display: grid; gap: var(--space-md); grid-template-columns: 1fr; }
@media (min-width: 640px) { .form-row { grid-template-columns: 1fr 1fr; } }
.form-actions { display: flex; gap: var(--space-sm); justify-content: flex-end; flex-wrap: wrap; }
textarea.nx-field { min-height: 96px; resize: vertical; }
textarea.nx-field.code { min-height: 420px; font-family: var(--font-sans); font-size: 13px; line-height: 20px; }
select.nx-field { appearance: auto; }

.empty { padding: var(--space-xl) var(--space-md); text-align: center; color: var(--color-text-muted); }
.empty strong { display: block; color: var(--color-text-heading); font-weight: 600; margin-bottom: var(--space-xs); }

.table-wrap { overflow-x: auto; }
.actions-cell { text-align: right; white-space: nowrap; }
.btn-xs { height: 28px; padding: 0 10px; font-size: 12px; }
.btn-flat { background: none; color: var(--color-accent-hover); }
.btn-flat:hover { background: color-mix(in srgb, var(--color-accent) 10%, transparent); }
.btn-danger-flat { background: none; color: var(--color-danger); }
.btn-danger-flat:hover { background: color-mix(in srgb, var(--color-danger) 10%, transparent); }

.swatch { display: inline-block; width: 14px; height: 14px; border-radius: 4px; border: 1px solid var(--color-border); vertical-align: -2px; margin-right: 6px; }
.mono { font-variant-numeric: tabular-nums; }
.crumbs { display: flex; gap: var(--space-sm); color: var(--color-text-muted); font-size: 12px; margin-bottom: var(--space-sm); flex-wrap: wrap; }
.crumbs a { color: var(--color-text-muted); } .crumbs a:hover { color: var(--color-accent-hover); }

/* Sign in */
.signin { min-height: 100vh; display: grid; place-items: center; padding: var(--space-md); }
.signin .nx-surface-card { width: 100%; max-width: 400px; }
.signin .nx-brand { justify-content: center; margin-bottom: var(--space-lg); font-size: 18px; }
.signin h1 { font-size: 20px; line-height: 26px; font-weight: 600; margin-bottom: var(--space-xs); }
.code-input { font-size: 24px; letter-spacing: 0.3em; text-align: center; font-variant-numeric: tabular-nums; }

/* Dialog */
.dialog-backdrop { position: fixed; inset: 0; background: rgb(15 23 42 / 45%); display: grid; place-items: center; padding: var(--space-md); z-index: 1200; }
.dialog { width: 100%; max-width: 560px; }
.dialog.wide { max-width: 860px; }
.dialog h2 { font-size: 16px; line-height: 24px; font-weight: 600; margin-bottom: var(--space-xs); }
.dialog .muted { margin-bottom: var(--space-md); }

/* Toast */
.toast { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%) translateY(20px); opacity: 0; transition: .2s; background: var(--color-text-heading); color: #fff; padding: 10px 16px; border-radius: var(--radius); font-size: 14px; z-index: 9999; pointer-events: none; max-width: 90vw; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.error { background: var(--color-danger); }

.loader { display: inline-block; width: 16px; height: 16px; border: 2px solid var(--color-border); border-top-color: var(--color-accent); border-radius: 50%; animation: spin .8s linear infinite; vertical-align: middle; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Resource Library */
.dropzone { border: 1px dashed var(--color-border); border-radius: var(--radius); padding: 14px 16px; margin-bottom: 8px; color: var(--color-text); background: var(--color-gray-50); display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.dropzone.over { border-color: var(--color-accent); background: color-mix(in srgb, var(--color-accent) 8%, var(--color-surface)); }
.lib-section + hr { margin: 24px 0; }

/* Conversation */
.chat-layout { display: grid; gap: var(--space-md); grid-template-columns: 1fr; }
@media (min-width: 1000px) { .chat-layout { grid-template-columns: 1fr 300px; align-items: start; } }
.chat-card { display: flex; flex-direction: column; height: calc(100vh - 220px); min-height: 420px; }
.chat-log { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 10px; }
.bubble { max-width: 80%; padding: 10px 14px; border-radius: var(--radius-lg); font-size: 14px; line-height: 20px; white-space: pre-wrap; word-wrap: break-word; }
.bubble.user { align-self: flex-end; background: var(--color-accent); color: var(--color-on-accent); border-bottom-right-radius: 4px; }
.bubble.agent { align-self: flex-start; background: var(--color-gray-100); color: var(--color-text-heading); border-bottom-left-radius: 4px; }
.bubble.note { align-self: center; background: none; color: var(--color-text-subtle); font-size: 12px; padding: 2px 8px; }
.chat-input { display: flex; gap: 8px; padding: 12px; border-top: 1px solid var(--color-border); }
.chat-input textarea { flex: 1; resize: none; min-height: 44px; }
.side-row { display: flex; justify-content: space-between; gap: 8px; padding: 6px 0; border-bottom: 1px solid color-mix(in srgb, var(--color-border) 60%, transparent); font-size: 13px; }
.side-row:last-child { border-bottom: 0; }