/* ================================================================
   SEO-GEO.CSS — Visual Styles for TL;DR, FAQ, and Accessibility
   CyberTeens Academy | Premium Optimization Design
   ================================================================ */

/* Accessibility Utility for visually hidden SEO headers */
.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;
}

/* TL;DR Executive Summary Block - Premium Glassmorphism */
.tldr-box {
    background: rgba(255, 255, 255, 0.65);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(13, 71, 161, 0.08);
    border-left: 5px solid var(--primary);
    border-radius: var(--radius-lg);
    padding: 1.5rem 1.8rem;
    margin: 1.5rem 0 2.5rem 0;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
}

.tldr-box:hover {
    box-shadow: var(--shadow-md);
    border-left-color: var(--primary-alt);
    transform: translateY(-2px);
}

.tldr-box h3 {
    color: var(--primary);
    font-size: 1.1rem;
    margin-bottom: 0.6rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-weight: 600;
}

.tldr-box h3::before {
    content: '💡';
    font-size: 1.2rem;
}

.tldr-box p {
    color: var(--gray-600);
    font-size: 0.95rem;
    line-height: 1.6;
    margin: 0;
}

/* FAQ Accordion using HTML5 <details> & <summary> */
.faq-container {
    max-width: 850px;
    margin: 2.5rem auto 4rem;
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.faq-item {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition);
    box-shadow: var(--shadow-xs);
}

.faq-item[open] {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.faq-item summary {
    padding: 1.3rem 1.8rem;
    font-weight: 600;
    color: var(--gray-800);
    font-size: 1.05rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    list-style: none;
    user-select: none;
    transition: all var(--transition);
    outline: none;
}

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

.faq-item summary::after {
    content: '➔';
    font-size: 0.9rem;
    color: var(--gray-400);
    transition: transform var(--transition), color var(--transition);
    transform: rotate(90deg);
}

.faq-item summary:hover {
    color: var(--primary);
    background: var(--gray-50);
}

.faq-item[open] summary {
    color: var(--primary);
    border-bottom: 1px solid var(--gray-150);
    background: var(--white);
}

.faq-item[open] summary::after {
    transform: rotate(270deg);
    color: var(--primary);
}

.faq-content {
    padding: 1.5rem 1.8rem;
    color: var(--gray-600);
    font-size: 0.95rem;
    line-height: 1.6;
    background: var(--white);
    animation: slideDown 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.faq-content p {
    margin-bottom: 1rem;
}

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

.faq-content ul {
    margin-left: 1.5rem;
    margin-top: 0.5rem;
    margin-bottom: 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.faq-content ul li {
    font-size: 0.92rem;
}

.faq-content .authoritative-sources {
    margin-top: 1.2rem;
    padding-top: 1rem;
    border-top: 1px dashed var(--gray-200);
    font-size: 0.88rem;
    color: var(--gray-500);
}

.faq-content .authoritative-sources a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transitionFast);
}

.faq-content .authoritative-sources a:hover {
    color: var(--primary-alt);
    text-decoration: underline;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* FAQ link styling in sections */
.faq-item summary:focus-visible {
    box-shadow: var(--shadow-focus);
}

/* Date and Last Updated styles */
.last-updated-badge {
    display: inline-block;
    background: var(--gray-150);
    color: var(--gray-600);
    font-size: 0.8rem;
    padding: 0.3rem 0.8rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
    margin-bottom: 1rem;
    border: 1px solid var(--gray-200);
}