/* ============================================================
   ARECH Sticky Section Tabs — block-47 view.css
   Port of /prototypes/subpage-header-explore-2026-05-20/header-2-product-led.html
   lines ~307-348 (`.tabs` / `.tabs-inner` / `.tab`).
   BEM-renamed to `.arech-sst__*` for namespace isolation.
   All values reference design-system-v1.md tokens (no magic numbers).
   ============================================================ */

.arech-sst {
    position: sticky;
    top: var(--header-height);
    z-index: 50;
    background: rgba(13, 13, 15, 0.92);
    backdrop-filter: blur(20px) saturate(1.4);
    -webkit-backdrop-filter: blur(20px) saturate(1.4);
    border-top: 1px solid rgba(255, 255, 255, 0.04);
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.arech-sst__inner {
    max-width: var(--container-wide);
    margin-inline: auto;
    padding-inline: 16px;
    display: flex;
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
}

.arech-sst__inner::-webkit-scrollbar { display: none; }

@media (min-width: 480px)  { .arech-sst__inner { padding-inline: 24px; } }
@media (min-width: 768px)  { .arech-sst__inner { padding-inline: 32px; } }
@media (min-width: 1024px) { .arech-sst__inner { padding-inline: 40px; } }

/* ---------- Common tab geometry (shared by underline + pill variants) ---------- */
.arech-sst__tab {
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
    min-height: 44px;  /* WCAG 2.2 touch target floor */
    padding: 14px 18px;
    font-family: var(--font-mono);    /* G1-fix B2: was 'DM Mono', monospace — tokenised so theme font swaps stay consistent */
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--muted-accessible);
    text-decoration: none;
    white-space: nowrap;
    cursor: pointer;
    transition:
        color var(--motion-fast) var(--ease-standard),
        border-color var(--motion-fast) var(--ease-standard),
        background-color var(--motion-fast) var(--ease-standard);
}

.arech-sst__tab:hover,
.arech-sst__tab:focus-visible {
    color: var(--orange);
}

.arech-sst__tab:focus-visible {
    outline: 2px solid var(--orange);
    outline-offset: -2px;
}

/* ---------- V1 — Underline-on-active (canonical, default) ---------- */
.arech-sst--underline .arech-sst__tab {
    border-bottom: 2px solid transparent;
}

.arech-sst--underline .arech-sst__tab.is-active {
    color: var(--orange);
    border-bottom-color: var(--orange);
}

/* ---------- V2 — Pill-on-active (alternative) ---------- */
.arech-sst--pill .arech-sst__inner {
    gap: var(--space-2);              /* G1-tokenise: was 6px — closest token (8px) */
    padding-block: var(--space-2);    /* G1-tokenise: was 8px */
}

.arech-sst--pill .arech-sst__tab {
    /* G1-fix B1: was min-height 36px / padding 8px 16px — below WCAG 2.2 AA 44×44 touch-target floor */
    min-height: 44px;
    padding: var(--space-3) var(--space-4);
    border-radius: 999px;
    border: 1px solid transparent;
}

.arech-sst--pill .arech-sst__tab.is-active {
    color: var(--off-white);
    background-color: var(--orange);
    border-color: var(--orange);
}

.arech-sst--pill .arech-sst__tab.is-active:hover,
.arech-sst--pill .arech-sst__tab.is-active:focus-visible {
    color: var(--off-white);
}

/* ---------- Reduced-motion: hard gate per CLAUDE.md WCAG 2.2 AA floor ---------- */
@media (prefers-reduced-motion: reduce) {
    .arech-sst__tab {
        transition: none;
    }
}

/* ---------- Concrete edit-mode shim — un-sticky tabs so editor toolbar stays usable ---------- */
.ccm-edit-mode .arech-sst {
    position: relative;
    top: auto;
    z-index: auto;
}

/* ---------- Print: strip chrome ---------- */
@media print {
    .arech-sst { display: none; }
}