/* ═══════════════════════════════════════════════════════════
   WORLD ENGINE: the layer viewer (Sky, Climate, Land, Peoples)
   One layer shows at a time; the bar and the arrows move between them.
   Without JavaScript nothing is hidden: the layers stack as before.
   Brand guidelines Edition 1.0: shared.css tokens only, Veilstone only.
   ═══════════════════════════════════════════════════════════ */

.we-viewer { scroll-margin-top: 70px; }
/* a link to something inside a layer lands below the bar, not under it */
html.we-lv .we-viewer > .we-section [id] { scroll-margin-top: 140px; }

/* ── The bar ── */
.we-lv-bar {
    position: sticky;
    top: var(--we-head, 70px);       /* under the site header (layers.js measures it) */
    z-index: 30;
    background: var(--bg-frame);
    border-top: 1px solid var(--border-ornate);
    border-bottom: 1px solid var(--border-ornate);
    box-shadow: 0 6px 18px color-mix(in srgb, var(--bg-dark) 35%, transparent);
}
.we-lv-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    align-items: stretch;
    gap: 0.25rem;
}
.we-lv-tabs {
    flex: 1;
    min-width: 0;                    /* the strip scrolls sideways on a phone instead of widening the page */
    display: flex;
    justify-content: center;
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
}
.we-lv-tabs::-webkit-scrollbar { display: none; }

.we-lv-tab {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    flex: none;
    padding: 0.85rem 1.1rem 0.75rem;
    border-bottom: 2px solid transparent;
    color: var(--parchment-dark);
    text-decoration: none;
    font-family: 'Veilstone Sans', sans-serif;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    white-space: nowrap;
    transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.we-lv-num {
    font-family: 'Veilstone Text', Georgia, serif;
    font-size: 1.05rem;
    font-weight: 400;
    letter-spacing: 0;
    text-transform: none;
    color: var(--border-ornate);
    transition: color 0.2s ease;
}
a.we-lv-tab:hover { color: var(--parchment); background: color-mix(in srgb, var(--gold) 8%, transparent); }
a.we-lv-tab:hover .we-lv-num { color: var(--gold); }
.we-lv-tab[aria-selected="true"] { color: var(--parchment); border-bottom-color: var(--gold); }
.we-lv-tab[aria-selected="true"] .we-lv-num { color: var(--gold-light); }
.we-lv-tab:focus-visible { outline: 2px solid var(--gold-light); outline-offset: -2px; }
.we-lv-tab.is-sealed { color: color-mix(in srgb, var(--parchment-dark) 55%, transparent); cursor: default; }
.we-lv-tab.is-sealed .we-lv-num { color: color-mix(in srgb, var(--border-ornate) 70%, transparent); }
.we-lv-tab small { font-size: 0.62rem; font-weight: 400; letter-spacing: 0.12em; }

.we-lv-arrow {
    flex: none;
    align-self: center;
    width: 2.6rem;
    height: 2.6rem;
    display: none;                   /* shown once the viewer is running */
    align-items: center;
    justify-content: center;
    padding: 0;
    color: var(--parchment);
    background: transparent;
    border: 1px solid color-mix(in srgb, var(--parchment) 60%, transparent);
    font-family: 'Veilstone Text', Georgia, serif;
    font-size: 1.4rem;
    line-height: 1;
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, opacity 0.2s ease;
}
.we-lv-arrow:hover:not(:disabled) { background: var(--gold); border-color: var(--gold); color: var(--bg-dark); }
.we-lv-arrow:focus-visible { outline: 2px solid var(--gold-light); outline-offset: 2px; }
.we-lv-arrow:disabled { opacity: 0.3; cursor: default; }

/* ── One layer at a time (only when the viewer is running) ── */
html.we-lv .we-lv-arrow { display: inline-flex; }
html.we-lv .we-viewer > .we-section { display: none; }
html.we-lv[data-we-layer="phase-one"] #phase-one,
html.we-lv[data-we-layer="phase-two"] #phase-two,
html.we-lv[data-we-layer="phase-three"] #phase-three,
html.we-lv[data-we-layer="phase-four"] #phase-four { display: block; }
html.we-lv .we-viewer > .we-section.is-arriving { animation: we-lv-in 0.35s ease-out; }
@keyframes we-lv-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ── Previous / next at the foot of each layer ── */
.we-lv-pager {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    margin-top: 3rem;
    padding-top: 1.75rem;
    border-top: 1px solid color-mix(in srgb, var(--gold) 25%, transparent);
}
.section-parchment .we-lv-pager { border-top-color: color-mix(in srgb, var(--wood-light) 35%, transparent); }
.we-lv-step {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    max-width: 48%;
    padding: 0.8rem 1.1rem;
    border: 1px solid color-mix(in srgb, var(--gold) 55%, transparent);
    text-decoration: none;
    transition: background 0.2s ease;
}
.we-lv-step.is-next { margin-left: auto; text-align: right; }
.we-lv-step span {
    font-family: 'Veilstone Sans', sans-serif;
    font-size: 0.68rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--gold);
}
.we-lv-step strong { font-family: 'Veilstone Sans', sans-serif; font-size: 1.05rem; color: var(--parchment); }
.we-lv-step:hover { background: color-mix(in srgb, var(--gold) 12%, transparent); }
.we-lv-step:focus-visible { outline: 2px solid var(--gold-light); outline-offset: 2px; }
.section-parchment .we-lv-step { border-color: color-mix(in srgb, var(--wood-light) 55%, transparent); }
.section-parchment .we-lv-step span { color: var(--wood-light); }
.section-parchment .we-lv-step strong { color: var(--text-dark); }
.section-parchment .we-lv-step:hover { background: color-mix(in srgb, var(--wood-light) 10%, transparent); }
.section-parchment .we-lv-step:focus-visible { outline-color: var(--wood-light); }

@media (max-width: 768px) {
    .we-lv-inner { padding: 0 0.5rem; }
    .we-lv-tabs { justify-content: flex-start; }
    .we-lv-tab { padding: 0.8rem 0.8rem 0.7rem; gap: 0.4rem; }
    .we-lv-tab small { display: none; }
    .we-lv-arrow { width: 2.3rem; height: 2.3rem; }
}
@media (max-width: 600px) {
    /* a phone shows the numerals, and the name of the open layer only */
    .we-lv-tabs { justify-content: center; }
    .we-lv-tab:not([aria-selected="true"]) .we-lv-name { display: none; }
    .we-lv-tab { padding: 0.8rem 0.75rem 0.7rem; }
    .we-lv-num { font-size: 1.15rem; }
}
@media (max-width: 480px) {
    .we-lv-step { max-width: none; flex: 1; padding: 0.7rem 0.8rem; }
    .we-lv-step strong { font-size: 0.95rem; }
}
@media (prefers-reduced-motion: reduce) {
    html.we-lv .we-viewer > .we-section.is-arriving { animation: none; }
}