/*
 * Westtree — FAQ Accordion (物理阻尼 spring expand)
 * 模板使用类名: .ar-faq__item / .ar-faq__q / .ar-faq__a / .ar-faq__icon
 * 用户要求：
 *   1. 点击即展开
 *   2. 展开使用物理阻尼 spring 动画
 *   3. 后台可改（已通过 ACF 字段管理）
 */

.ar-faq {
    max-width: 820px;
    margin: var(--space-12) auto 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.ar-faq__item {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: border-color 360ms var(--ease-out),
                background-color 360ms var(--ease-out);
    overflow: hidden;
    will-change: transform;
}

.ar-faq__item.is-open {
    border-color: var(--color-primary);
    background:
        linear-gradient(180deg, rgba(112, 239, 93, 0.08), transparent 70%),
        var(--color-bg-elevated);
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
}

.ar-faq__q {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    padding: var(--space-5) var(--space-6);
    text-align: left;
    font-size: var(--text-body-l);
    font-weight: var(--weight-semibold);
    color: var(--color-text);
    cursor: pointer;
    list-style: none;
    transition: color 240ms var(--ease-out);
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.ar-faq__q::-webkit-details-marker { display: none; }
.ar-faq__q:hover { color: var(--color-primary); }
.ar-faq__q:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: -2px;
}

.ar-faq__icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    color: var(--color-text-secondary);
    transition: transform 560ms var(--spring-soft),
                color 240ms var(--ease-out);
    transform-origin: center;
}

.ar-faq__item.is-open .ar-faq__icon {
    transform: rotate(135deg);
    color: var(--color-primary);
}

/* ----- Physical damping expand -----
   Use grid-template-rows trick: 0fr → 1fr with a spring-like easing.
   The body content uses transform/opacity for a subtle entrance.
*/
.ar-faq__a {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 560ms var(--spring-soft);
}

.ar-faq__item.is-open .ar-faq__a {
    grid-template-rows: 1fr;
}

.ar-faq__a-inner {
    overflow: hidden;
    min-height: 0;
    opacity: 0;
    transform: translateY(-6px) scaleY(0.96);
    transform-origin: top center;
    transition: transform 560ms var(--spring-soft),
                opacity 320ms var(--ease-out) 120ms;
}

.ar-faq__item.is-open .ar-faq__a-inner {
    transform: translateY(0) scaleY(1);
    opacity: 1;
}

.ar-faq__a-content {
    padding: 0 var(--space-6) var(--space-6);
    color: var(--color-text-secondary);
    line-height: var(--leading-relaxed);
    font-size: var(--text-body);
}

.ar-faq__a-content p { margin-bottom: var(--space-3); }
.ar-faq__a-content p:last-child { margin-bottom: 0; }
.ar-faq__a-content a {
    color: var(--color-primary);
    border-bottom: 1px dashed currentColor;
}
.ar-faq__a-content a:hover { color: var(--color-primary-hover); }
.ar-faq__a-content code {
    background: var(--color-bg);
    padding: 1px 6px;
    border-radius: var(--radius-xs);
    font-family: var(--font-mono);
    font-size: 0.92em;
}

/* Light-section variant — keep inside FAQ list when page is white */
.ar-section--light .ar-faq__item {
    background: var(--color-bg-light-elevated);
    border-color: var(--color-border-light);
}

.ar-section--light .ar-faq__item.is-open {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-card-hover-light);
}

.ar-section--light .ar-faq__q { color: var(--color-text-light); }
.ar-section--light .ar-faq__a-content { color: var(--color-text-light-body); }

@media (prefers-reduced-motion: reduce) {
    .ar-faq__a,
    .ar-faq__a-inner,
    .ar-faq__icon { transition-duration: 0.01ms !important; }
}