/**
 * .page-faq — composant FAQ premium partagé
 * Aligné sur le design de .perf-faq (performances) et .contact-faq (contact).
 * Variables uniquement (charte Deep Navy + Electric Teal).
 *
 * Markup attendu :
 *   <section class="page-faq" id="faq" aria-labelledby="faq-title">
 *     <header class="page-faq__head">
 *       <p class="page-faq__num">N°</p>
 *       <h2 id="faq-title" class="page-faq__title">Questions fréquentes</h2>
 *       <p class="page-faq__sub">Sous-titre optionnel.</p>
 *     </header>
 *     <div class="page-faq__list">
 *       <details class="page-faq__item">
 *         <summary class="page-faq__q">Question…</summary>
 *         <div class="page-faq__a"><p>Réponse…</p></div>
 *       </details>
 *     </div>
 *   </section>
 */

.page-faq {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--rhythm-section) var(--space-4);
}

.page-faq__head {
    text-align: center;
    margin-bottom: var(--rhythm-block);
}

.page-faq__num {
    font-family: var(--font-mono);
    font-size: var(--fs-caption);
    color: var(--accent-deep);
    letter-spacing: 0.14em;
    margin: 0 0 var(--space-2);
}
[data-theme="dark"] .page-faq__num {
    color: var(--accent);
}

.page-faq__title {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 3.5vw, 2.5rem);
    font-weight: 500;
    line-height: 1.15;
    letter-spacing: -0.01em;
    color: var(--text-primary);
    margin: 0 0 var(--space-3);
}

.page-faq__sub {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-secondary);
    max-width: 620px;
    margin: 0 auto;
}

.page-faq__list {
    max-width: 760px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.page-faq__item {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: border-color var(--transition-fast);
    overflow: hidden;
}
.page-faq__item[open] {
    border-color: color-mix(in srgb, var(--accent) 35%, var(--border));
}

.page-faq__q {
    cursor: pointer;
    list-style: none;
    padding: var(--space-4) var(--space-5);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-3);
    position: relative;
}
.page-faq__q::-webkit-details-marker { display: none; }
.page-faq__q::after {
    content: "+";
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--accent-deep);
    transition: transform var(--transition-fast);
    flex-shrink: 0;
    line-height: 1;
}
[data-theme="dark"] .page-faq__q::after {
    color: var(--accent);
}
.page-faq__item[open] .page-faq__q::after {
    transform: rotate(45deg);
}

.page-faq__a {
    padding: 0 var(--space-5) var(--space-5);
    border-top: 1px solid var(--border);
}
.page-faq__a p {
    margin: var(--space-3) 0 0;
    font-size: 0.9375rem;
    line-height: 1.65;
    color: var(--text-secondary);
}
.page-faq__a p + p {
    margin-top: var(--space-3);
}
.page-faq__a strong {
    color: var(--text-primary);
    font-weight: 600;
}
.page-faq__a a {
    color: var(--accent-deep);
    text-decoration: underline;
    text-underline-offset: 2px;
}
[data-theme="dark"] .page-faq__a a {
    color: var(--accent);
}

@media (prefers-reduced-motion: reduce) {
    .page-faq__item,
    .page-faq__q::after { transition: none; }
}