#reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    width: 0%;
    background: linear-gradient(90deg, #0891b2, #38bdf8, #2563eb);
    z-index: 60;
    transition: width 0.1s linear;
}

.article-body h2 { scroll-margin-top: 7rem; }
.article-body p {
    font-size: 0.9375rem;
    line-height: 1.85;
    color: #475569;
    margin-bottom: 1rem;
    font-weight: 500;
}
.article-body strong { color: #0f172a; font-weight: 800; }
.article-body a {
    color: #0891b2;
    font-weight: 700;
    text-decoration: none;
}
.article-body a:hover { text-decoration: underline; color: #2563eb; }
.article-body h2 {
    font-size: 1.125rem;
    font-weight: 800;
    color: #0f172a;
    margin-bottom: 1rem;
}
.article-body h3 {
    font-size: 0.875rem;
    font-weight: 800;
    color: #1e293b;
    margin-bottom: 0.375rem;
}
.article-body ul, .article-body ol { margin: 0; padding: 0; }

.article-lead {
    background: linear-gradient(135deg, #ecfeff 0%, #eff6ff 100%);
    border: 1px solid rgba(6, 182, 212, 0.2);
    border-radius: 0.75rem;
    padding: 1.25rem;
    margin-bottom: 2rem;
    font-size: 0.875rem;
    color: #475569;
    line-height: 1.75;
}

.article-section-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.75rem;
    height: 1.75rem;
    border-radius: 0.5rem;
    background: linear-gradient(135deg, #ecfeff, #dbeafe);
    color: #0891b2;
    font-size: 0.75rem;
    font-weight: 900;
    flex-shrink: 0;
}

.article-step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 999px;
    background: linear-gradient(135deg, #0891b2, #2563eb);
    color: #fff;
    font-size: 0.75rem;
    font-weight: 900;
    flex-shrink: 0;
    margin-top: 0.125rem;
    box-shadow: 0 4px 8px rgba(6, 182, 212, 0.3);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8125rem;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid rgba(0, 0, 0, 0.06);
}
.data-table thead tr { background: linear-gradient(135deg, #ecfeff, #eff6ff); }
.data-table th {
    padding: 10px 12px;
    font-weight: 800;
    text-align: left;
    color: #0891b2;
    font-size: 0.75rem;
    letter-spacing: 0.02em;
}
.data-table td {
    padding: 10px 12px;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    color: #475569;
    font-weight: 600;
}
.data-table tbody tr:hover { background: rgba(6, 182, 212, 0.04); }

.toc-link.active {
    color: #0891b2;
    background: rgba(6, 182, 212, 0.08);
    border-left-color: #0891b2;
}

.article-tag {
    font-size: 0.625rem;
    font-weight: 900;
    text-transform: uppercase;
    padding: 0.25rem 0.625rem;
    border-radius: 999px;
    background: #ecfeff;
    color: #0891b2;
    letter-spacing: 0.05em;
}

.article-card-box {
    border-radius: 0.75rem;
    border: 1px solid rgba(0, 0, 0, 0.05);
    background: #f8fafc;
    padding: 1rem;
}

.article-cta {
    background: linear-gradient(135deg, #0f172a 0%, #164e63 55%, #0891b2 100%);
    box-shadow: 0 20px 40px -5px rgba(6, 182, 212, 0.35);
    border-radius: 1rem;
    padding: 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
    color: #fff;
}
.article-cta .cta-eyebrow {
    color: #a5f3fc;
    font-size: 0.75rem;
    font-weight: 900;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: 0.75rem;
}
.article-cta .cta-title {
    color: #fff;
    font-size: 1.375rem;
    font-weight: 900;
    line-height: 1.35;
    margin-bottom: 0.5rem;
}
.article-cta .cta-desc {
    color: rgba(255, 255, 255, 0.88);
    font-size: 0.9375rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    max-width: 28rem;
    margin-left: auto;
    margin-right: auto;
}
.article-cta a {
    text-decoration: none;
}
.article-cta .cta-btn-primary {
    color: #fff;
}
.article-cta .cta-btn-secondary {
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.35);
    background: rgba(255, 255, 255, 0.12);
}
.article-cta .cta-btn-secondary:hover {
    background: rgba(255, 255, 255, 0.22);
}

.article-faq details {
    border-radius: 0.75rem;
    border: 1px solid rgba(0, 0, 0, 0.05);
    background: #f8fafc;
    padding: 1rem 1.25rem;
}
.article-faq summary {
    font-size: 0.875rem;
    font-weight: 700;
    color: #1e293b;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.article-faq summary::-webkit-details-marker { display: none; }