/* ============================================================
   ARECH FAQ Accordion block — front-end styles.
   Port of `site/src/components/product-type/ProductTypeSectionFAQ.astro`
   lines 77-200, BEM-renamed to `.arech-faq__*`.
   Zero JS — uses native <details>/<summary> for accordion behaviour.
   ============================================================ */

.arech-faq {
    background: var(--paper-1);
    color: var(--ink-2);
    padding-block: var(--space-9);
    padding-inline: var(--container-px);
}
@media (min-width: 1024px) {
    .arech-faq {
        padding-block: var(--space-10);
    }
}

.arech-faq__inner {
    max-width: 880px;
    margin-inline: auto;
}

/* ---- Section head ---- */
.arech-faq__head {
    margin-bottom: var(--space-7);
}

.arech-faq__eyebrow {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--orange-text);
    display: inline-flex;
    align-items: center;
    gap: 12px;
    margin-bottom: var(--space-4);
}
.arech-faq__eyebrow::before {
    content: '';
    width: 24px;
    height: 1px;
    background: var(--orange-text);
}

.arech-faq__title {
    font-family: var(--font-headline);
    font-weight: 600;
    font-size: clamp(32px, 4vw, 56px);
    line-height: 1.15;
    letter-spacing: -0.01em;
    color: var(--ink-1);
    margin: 0;
    max-width: 22ch;
}
.arech-faq__accent {
    color: var(--orange-text);
}

/* ---- Accordion list ---- */
.arech-faq__list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.arech-faq__item {
    background: var(--paper-2);
    border: 1px solid var(--hairline);
    border-radius: 4px;
    overflow: hidden;
    transition: border-color var(--motion-fast) var(--ease-standard);
}
.arech-faq__item[open] {
    border-color: var(--orange-link);
}

.arech-faq__summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    padding: var(--space-5) var(--space-6);
    list-style: none;
    cursor: pointer;
    font-family: var(--font-headline);
    font-weight: 600;
    font-size: 17px;
    line-height: 1.45;
    color: var(--ink-1);
    user-select: none;
}
.arech-faq__summary::-webkit-details-marker { display: none; }
.arech-faq__summary:focus-visible {
    outline: 2px solid var(--orange);
    outline-offset: -2px;
}
.arech-faq__summary > span:first-child {
    flex: 1;
}

.arech-faq__chev {
    display: inline-flex;
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    color: var(--orange-link);
    transition: transform var(--motion-fast) var(--ease-standard);
}
.arech-faq__item[open] .arech-faq__chev {
    transform: rotate(180deg);
}
.arech-faq__chev svg {
    width: 100%;
    height: 100%;
}

.arech-faq__body {
    padding: 0 var(--space-6) var(--space-6);
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.7;
    color: var(--ink-3);
}
.arech-faq__body a {
    color: var(--orange-link);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
    transition: color var(--motion-fast) var(--ease-standard);
}
.arech-faq__body a:hover {
    color: var(--orange-text);
}

/* ---- Reveal stagger ---- */
.arech-faq .arech-reveal {
    opacity: 0;
    transform: translateY(20px);
    transition:
        opacity var(--motion-reveal) var(--ease-standard),
        transform var(--motion-reveal) var(--ease-standard);
}
.arech-faq .arech-reveal.is-in {
    opacity: 1;
    transform: translateY(0);
}
.arech-faq .arech-reveal--s1 { transition-delay: var(--stagger-1); }
.arech-faq .arech-reveal--s2 { transition-delay: var(--stagger-2); }
.arech-faq .arech-reveal--s3 { transition-delay: var(--stagger-3); }
.arech-faq .arech-reveal--s4 { transition-delay: var(--stagger-4); }
.arech-faq .arech-reveal--s5 { transition-delay: var(--stagger-5); }

/* ---- Reduced motion ---- */
@media (prefers-reduced-motion: reduce) {
    .arech-faq .arech-reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }
    .arech-faq__chev,
    .arech-faq__item {
        transition: none !important;
    }
}

/* ---- Concrete edit-mode shim ---- */
.ccm-edit-mode .arech-faq {
    padding-block: var(--space-6);
}