/*! CSS Portal — CSS Grid Explorer (builds on code-tool.css and generator-tool.css) */
.gp { margin: 8px 0 24px; }
.gp [hidden] { display: none !important; }

/* topic tabs */
.gp-topics { display: flex; gap: 4px; padding: 4px; margin: 0 0 16px; overflow-x: auto; background: var(--ct-surface-2); border-radius: 12px; scrollbar-width: thin; }
.gp-topic { flex: 1 0 auto; display: inline-flex; align-items: center; justify-content: center; gap: 7px; min-height: 40px; padding: 0 14px; font: inherit; font-size: 14px; font-weight: 600; color: var(--ct-muted); white-space: nowrap; background: transparent; border: 0; border-radius: 9px; cursor: pointer; transition: color .15s, background-color .15s; }
.gp-topic i { font-size: 18px; }
.gp-topic:hover { color: var(--ct-text); }
.gp-topic.is-active { color: var(--ct-on-accent); background: var(--ct-accent); box-shadow: 0 1px 3px rgba(15, 23, 42, .18); }
.gp-topic:focus-visible { outline: none; box-shadow: 0 0 0 3px var(--ct-accent-soft), inset 0 0 0 2px var(--ct-accent); }

/* lesson intro */
.gp-lead { margin: 0 0 4px; }
.gp-lead h2 { margin: 0 0 6px; font-size: 20px; }
.gp-lead p { margin: 0 0 8px; font-size: 15px; line-height: 1.65; color: var(--ct-text); }
.gp code { font-family: var(--ct-mono); font-size: .88em; padding: 1px 5px; border-radius: 5px; background: var(--ct-surface-2); color: var(--ct-text); }

/* explanation under the preview */
.gp-explain { display: grid; gap: 8px; padding: 12px 16px 14px; border-top: 1px solid var(--ct-border); background: var(--ct-surface); font-size: 14px; line-height: 1.6; color: var(--ct-text); }
.gp-explain:empty { display: none; }
.gp-explain p { margin: 0; }
.gp-explain b { font-weight: 700; }
.gp-tracks { display: flex; flex-wrap: wrap; gap: 4px 8px; align-items: baseline; font-family: var(--ct-mono); font-size: 12.5px; color: var(--ct-text); font-variant-numeric: tabular-nums; }
.gp-tracks span { font-family: inherit; font-size: 11px; font-weight: 700; letter-spacing: .05em; text-transform: uppercase; color: var(--ct-muted); }
.gp-tracks small { color: var(--ct-muted); }
.gp-warn { padding: 8px 12px; border-radius: 8px; color: var(--ct-text); background: color-mix(in srgb, var(--ct-warn) 12%, transparent); border-left: 3px solid var(--ct-warn); }
.gp-legend { display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: 13px; color: var(--ct-muted); }
.gp-legend span { display: inline-flex; align-items: center; gap: 6px; }
.gp-legend i { width: 14px; height: 14px; border-radius: 4px; }
.gp-legend .is-explicit { background: #2563eb; }
.gp-legend .is-implicit { background: #fef3c7; outline: 2px dashed #f59e0b; outline-offset: -2px; }
.gp-legend .is-outline { border: 2px solid #2563eb; }

/* named areas editor */
.gp-areas { width: 100%; min-height: 128px; padding: 10px 12px; font: 13px/1.7 var(--ct-mono); color: var(--ct-text); background: var(--ct-surface); border: 1px solid var(--ct-border-strong); border-radius: 8px; resize: vertical; tab-size: 2; }
.gp-areas:focus { outline: none; border-color: var(--ct-accent); box-shadow: 0 0 0 3px var(--ct-accent-soft); }
.gp-areas[aria-invalid="true"] { border-color: var(--ct-err); }
.gp-error { margin: 0; padding: 8px 10px; font-size: 13px; line-height: 1.5; color: var(--ct-err); background: color-mix(in srgb, var(--ct-err) 9%, transparent); border-radius: 8px; }
.gp .gt-hint code, .gp-error code { font-size: .92em; }

@media (max-width: 575.98px) {
	.gp-topics { flex-wrap: wrap; overflow: visible; }
	.gp-topic { padding: 0 11px; font-size: 13px; min-height: 36px; }
	.gp-lead h2 { font-size: 18px; }
	.gp-explain { padding: 10px 12px 12px; font-size: 13.5px; }
}
@media (prefers-reduced-motion: reduce) { .gp-topic { transition: none; } }