/* --- Section collapse (FAQ, self-hosting): closed by default to keep the page short --- */
.section-collapse {
    margin: 0 auto;
}

.faq-section-collapse {
    max-width: 800px;
}

.collapse-summary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    list-style: none;
    cursor: pointer;
    font-weight: 700;
    font-size: 1rem;
    color: var(--accent);
    background: oklch(0.68 0.13 150 / 0.08);
    border: 1px solid oklch(0.68 0.13 150 / 0.3);
    border-radius: 99px;
    padding: 0.85rem 2rem;
    max-width: 360px;
    margin: 0 auto;
    transition: background 0.3s, box-shadow 0.3s, transform 0.3s;
}

.collapse-summary::-webkit-details-marker {
    display: none;
}

.collapse-summary:hover {
    background: oklch(0.68 0.13 150 / 0.16);
    box-shadow: 0 0 20px oklch(0.68 0.13 150 / 0.25);
    transform: translateY(-2px);
}

.collapse-summary .collapse-chevron {
    flex-shrink: 0;
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.section-collapse[open] .collapse-chevron {
    transform: rotate(180deg);
}

.collapse-label-hide { display: none; }
.section-collapse[open] .collapse-label-show { display: none; }
.section-collapse[open] .collapse-label-hide { display: inline; }

.section-collapse[open] .collapse-summary {
    margin-bottom: 2rem;
}

.section-collapse[open] .collapse-content {
    animation: collapse-content-in 0.4s ease-out;
}

@keyframes collapse-content-in {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
    .section-collapse[open] .collapse-content {
        animation: none;
    }
}

/* --- FAQ Section --- */

.faq-grid {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: oklch(0.27 0.035 130 / 0.45);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
    padding: 1.5rem 2rem;
    cursor: pointer;
    transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
    overflow: hidden;
}

.faq-item:hover {
    border-color: oklch(0.68 0.13 150 / 0.3);
    box-shadow: 0 8px 20px oklch(0.68 0.13 150 / 0.1);
}

.faq-item[open] {
    border-color: oklch(0.68 0.13 150 / 0.4);
    background: oklch(0.27 0.035 130 / 0.65);
}

.faq-item summary {
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--text);
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: '+';
    font-size: 1.4rem;
    color: var(--accent);
    font-weight: 300;
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    flex-shrink: 0;
    transform-origin: center;
}

.faq-item[open] summary::after {
    transform: rotate(45deg);
}

.faq-item p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

/* --- Focus states for interactive cards --- */
.feature-card:focus-visible,
.use-case-card:focus-visible,
.compat-logo:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 4px;
    transform: translateY(-5px);
}
.feature-card,
.use-case-card,
.compat-logo,
section[id],
header[id] {
    scroll-margin-top: 100px;
}

/* --- Screen-reader-only (also crawlable by search engines) --- */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* --- Skip-to-content accessibility link --- */
.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    background: var(--accent);
    color: var(--text-on-green);
    padding: 0.75rem 1.25rem;
    border-radius: 0 0 8px 0;
    font-weight: 700;
    z-index: 9999;
    text-decoration: none;
}
.skip-link:focus {
    left: 0;
}

/* --- Reduced motion support --- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    .join-status-pulse { animation: none; }
    .status-ring.active-pulse { animation: none; }
}

/* --- will-change hints for animated elements --- */
.join-status-pulse,
.status-ring.active-pulse,
.hero-mockup-wrapper,
.cta-group .btn {
    will-change: transform, opacity;
}
@media (prefers-reduced-motion: reduce) {
    .join-status-pulse,
    .status-ring.active-pulse,
    .hero-mockup-wrapper,
    .cta-group .btn {
    }
}