/* Advanced SEO Features Styling - Phase 5 */

/* Breadcrumbs */
.breadcrumbs {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 0;
    position: static;
    z-index: 999;
    margin-bottom: 1rem;
}

.breadcrumb-list {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    align-items: center;
    gap: 0.5rem;
}

.breadcrumb-item {
    display: flex;
    align-items: center;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.breadcrumb-item:not(:last-child)::after {
    content: '›';
    margin-left: 0.75rem;
    color: var(--gray-400);
    font-weight: 600;
}

.breadcrumb-item a {
    color: var(--primary);
    text-decoration: none;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    transition: all 0.3s ease;
    font-weight: 500;
}

.breadcrumb-item a:hover {
    background: var(--primary-light);
    color: var(--primary-dark);
}

.breadcrumb-item [aria-current="page"] {
    color: var(--text-primary);
    font-weight: 600;
}

/* Reading Time */
.reading-time {
    display: inline-flex;
    align-items: center;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    margin: 1rem 0;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

/* Auto Table of Contents */
.auto-toc {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--primary);
    border-radius: 12px;
    padding: 1.5rem;
    margin: 2rem 0;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
    position: relative;
}

.auto-toc::before {
    content: '📋';
    position: absolute;
    top: -10px;
    left: 1rem;
    background: var(--bg-primary);
    padding: 0 0.5rem;
    font-size: 1.2rem;
}

.auto-toc h3 {
    color: var(--text-secondary);
    font-size: 1.25rem;
    margin: 0 0 1rem 0;
    font-weight: 600;
}

.auto-toc ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.auto-toc li {
    margin: 0.5rem 0;
    padding-left: 0;
}

.auto-toc li::before {
    display: none;
}

.auto-toc a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    transition: all 0.3s ease;
    display: block;
    font-weight: 500;
    border-left: 3px solid transparent;
}

.auto-toc a:hover,
.auto-toc a:focus {
    background: var(--primary-light);
    color: var(--primary);
    border-left-color: var(--primary);
    text-decoration: none;
    transform: translateX(4px);
}

.toc-level-h2 {
    font-weight: 600;
}

.toc-level-h3 {
    padding-left: 1rem;
    font-size: 0.95rem;
}

.toc-level-h4 {
    padding-left: 2rem;
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Social Sharing */
.social-share {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    margin: 3rem 0;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.social-share h3 {
    color: var(--text-secondary);
    font-size: 1.25rem;
    margin: 0 0 1.5rem 0;
    font-weight: 600;
}

.share-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
    align-items: center;
}

.share-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.25rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    background: var(--bg-primary);
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.875rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    min-height: 44px;
    min-width: 120px;
    position: relative;
    overflow: hidden;
}

.share-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: left 0.5s ease;
}

.share-btn:hover::before {
    left: 100%;
}

.share-btn:hover,
.share-btn:focus {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    outline: none;
}

.share-btn.facebook {
    border-color: #1877f2;
    color: #1877f2;
}

.share-btn.facebook:hover {
    background: #1877f2;
    color: white;
}

.share-btn.twitter {
    border-color: #1da1f2;
    color: #1da1f2;
}

.share-btn.twitter:hover {
    background: #1da1f2;
    color: white;
}

.share-btn.linkedin {
    border-color: #0a66c2;
    color: #0a66c2;
}

.share-btn.linkedin:hover {
    background: #0a66c2;
    color: white;
}

.share-btn.copy {
    border-color: var(--success);
    color: var(--success);
}

.share-btn.copy:hover {
    background: var(--success);
    color: white;
}

.share-btn.native {
    border-color: var(--primary);
    color: var(--primary);
}

.share-btn.native:hover {
    background: var(--primary);
    color: white;
}

/* Enhanced Meta Display */
.page-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
    margin: 1rem 0;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.meta-item {
    display: flex;
    align-items: center;
    font-size: 0.875rem;
    color: var(--text-muted);
    gap: 0.5rem;
}

.meta-item .icon {
    font-size: 1rem;
}

/* SEO Score Indicator */
.seo-score {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--bg-primary);
    border: 2px solid var(--primary);
    border-radius: 50%;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--primary);
    font-size: 0.875rem;
    box-shadow: 0 4px 20px rgba(196, 30, 58, 0.3);
    z-index: 1000;
    cursor: pointer;
    transition: all 0.3s ease;
}

.seo-score:hover {
    transform: scale(1.1);
    box-shadow: 0 8px 32px rgba(196, 30, 58, 0.4);
}

.seo-score.excellent {
    border-color: var(--success);
    color: var(--success);
    box-shadow: 0 4px 20px rgba(5, 150, 105, 0.3);
}

.seo-score.good {
    border-color: var(--warning);
    color: var(--warning);
    box-shadow: 0 4px 20px rgba(245, 158, 11, 0.3);
}

.seo-score.poor {
    border-color: var(--error);
    color: var(--error);
    box-shadow: 0 4px 20px rgba(220, 38, 38, 0.3);
}

/* Back to Top Button Enhancement */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    left: 2rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 16px rgba(196, 30, 58, 0.3);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(196, 30, 58, 0.4);
}

/* Print Optimizations */
@media print {
    .breadcrumbs,
    .social-share,
    .seo-score,
    .back-to-top {
        display: none !important;
    }

    .auto-toc {
        break-inside: avoid;
        background: white !important;
        border: 1px solid #ddd !important;
    }

    .reading-time {
        background: white !important;
        border: 1px solid #ddd !important;
    }
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .breadcrumbs {
        top: 70px;
    }

    .breadcrumb-list {
        padding: 0 1rem;
        font-size: 0.8rem;
    }

    .share-buttons {
        flex-direction: column;
        gap: 0.5rem;
    }

    .share-btn {
        width: 100%;
        max-width: 280px;
    }

    .auto-toc {
        padding: 1rem;
    }

    .seo-score {
        bottom: 1rem;
        right: 1rem;
        width: 50px;
        height: 50px;
        font-size: 0.75rem;
    }

    .back-to-top {
        bottom: 1rem;
        left: 1rem;
        width: 45px;
        height: 45px;
    }

    .page-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    .breadcrumbs {
        background: rgba(15, 23, 42, 0.95);
        border-color: var(--border-color);
    }

    .auto-toc,
    .social-share,
    .page-meta {
        background: var(--bg-primary);
        border-color: var(--border-color);
    }

    .reading-time {
        background: var(--bg-secondary);
        color: var(--text-secondary);
        border-color: var(--border-color);
    }

    .share-btn {
        background: var(--bg-primary);
        border-color: var(--border-color);
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    .breadcrumb-item a,
    .auto-toc a,
    .share-btn {
        border-width: 2px;
    }

    .breadcrumb-item a:focus,
    .auto-toc a:focus,
    .share-btn:focus {
        outline: 3px solid currentColor;
        outline-offset: 2px;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    .share-btn::before,
    .back-to-top,
    .seo-score {
        transition: none;
    }

    .auto-toc a:hover {
        transform: none;
    }
}