/**
 * Trang Hỏi đáp — bố cục sidebar + nội dung, màu thương hiệu đỏ #990000.
 */

:root {
    --faq-primary: #990000;
    --faq-primary-muted: rgba(153, 0, 0, 0.08);
    --faq-text: #0f172a;
    --faq-muted: #64748b;
    --faq-surface: #ffffff;
    --faq-surface-alt: #f8fafc;
    --faq-radius: 14px;
    --faq-shadow: 0 12px 40px rgba(15, 23, 42, 0.08);
}

.faq-page {
    color: var(--faq-text);
    background: var(--faq-surface);
}

.faq-hero {
    position: relative;
    min-height: 220px;
    display: flex;
    align-items: center;
    background-color: #140505;
    background-image: linear-gradient(
            118deg,
            rgba(35, 5, 5, 0.92) 0%,
            rgba(35, 5, 5, 0.72) 50%,
            rgba(35, 5, 5, 0.45) 100%
        ),
        url('https://images.unsplash.com/photo-1509391366360-2e959784a276?auto=format&fit=crop&w=1920&q=80');
    background-size: cover;
    background-position: center;
}

@media (min-width: 992px) {
    .faq-hero {
        min-height: 260px;
    }
}

.faq-hero__inner {
    padding-top: 2rem;
    padding-bottom: 2rem;
}

.faq-breadcrumb .breadcrumb {
    background: transparent;
    padding: 0;
    margin-bottom: 0.75rem;
}

.faq-breadcrumb .breadcrumb-item,
.faq-breadcrumb .breadcrumb-item a {
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.9rem;
}

.faq-breadcrumb .breadcrumb-item.active {
    color: #fff;
}

.faq-hero__title {
    color: #fff;
    font-weight: 800;
    letter-spacing: 0.04em;
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin-bottom: 0.5rem;
}

.faq-hero__lead {
    color: rgba(255, 255, 255, 0.88);
    max-width: 42rem;
    margin: 0;
    font-size: 0.98rem;
    line-height: 1.55;
}

.faq-body {
    padding: clamp(2rem, 4vw, 3.5rem) 0 clamp(3rem, 5vw, 4.5rem);
    background: var(--faq-surface-alt);
}

.faq-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

@media (min-width: 992px) {
    .faq-layout {
        grid-template-columns: minmax(220px, 280px) 1fr;
        gap: 2rem;
        align-items: start;
    }
}

.faq-sidebar {
    background: var(--faq-surface);
    border-radius: var(--faq-radius);
    box-shadow: var(--faq-shadow);
    padding: 1rem 1rem 1.1rem;
    position: sticky;
    top: calc(var(--header-offset, 80px) + 12px);
}

.faq-sidebar__title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--faq-muted);
    font-weight: 700;
    margin: 0 0 0.75rem 0.35rem;
}

.faq-sidebar__list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.faq-sidebar__btn {
    display: block;
    width: 100%;
    text-align: left;
    border: 0;
    background: transparent;
    padding: 0.65rem 0.85rem;
    border-radius: 10px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--faq-text);
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease;
}

.faq-sidebar__btn:hover {
    background: var(--faq-primary-muted);
    color: var(--faq-primary);
}

.faq-sidebar__btn.is-active {
    background: var(--faq-primary);
    color: #fff;
}

.faq-main {
    background: var(--faq-surface);
    border-radius: var(--faq-radius);
    box-shadow: var(--faq-shadow);
    padding: clamp(1.25rem, 3vw, 2rem);
    min-height: 200px;
}

.faq-panel {
    display: none;
}

.faq-panel.is-active {
    display: block;
}

.faq-panel__heading {
    font-size: 1.05rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--faq-primary);
    margin-bottom: 1.25rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--faq-primary-muted);
}

.faq-accordion .accordion-button {
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--faq-text);
    background: var(--faq-surface-alt);
    box-shadow: none;
}

.faq-accordion .accordion-button:not(.collapsed) {
    color: var(--faq-primary);
    background: #fff7f7;
}

.faq-accordion .accordion-button:focus {
    box-shadow: 0 0 0 0.2rem rgba(153, 0, 0, 0.15);
}

.faq-accordion .accordion-body {
    color: var(--faq-muted);
    font-size: 0.95rem;
    line-height: 1.65;
}

.faq-accordion .accordion-body p:last-child {
    margin-bottom: 0;
}