.article-content {
    max-width: 840px;
    margin: 0 auto;
    padding: 3rem 1.5rem;
}

.article-content h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 800;
    color: #0f172a;
    margin: 3rem 0 1rem;
    line-height: 1.3;
}

.article-content h3 {
    font-size: clamp(1.125rem, 2vw, 1.5rem);
    font-weight: 700;
    color: #1e293b;
    margin: 2rem 0 0.75rem;
}

.article-content p {
    color: #475569;
    line-height: 1.8;
    margin-bottom: 1rem;
    font-size: 1.0625rem;
}

.article-content ul.article-list {
    list-style: none;
    padding: 0;
    margin: 1.5rem 0;
}

.article-content ul.article-list li {
    padding: 0.75rem 0 0.75rem 2rem;
    position: relative;
    color: #475569;
    line-height: 1.7;
    font-size: 1.0625rem;
}

.article-content ul.article-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #059669;
    font-weight: 700;
    font-size: 1.125rem;
}

.article-content code {
    background: #f1f5f9;
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9em;
    color: #1e40af;
}

.article-content strong {
    color: #0f172a;
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.metric-card {
    background: white;
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    border: 1px solid #e2e8f0;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.metric-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
}

.metric-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    border-radius: 1rem;
    font-size: 1.25rem;
    font-weight: 800;
    color: white;
    margin-bottom: 1rem;
}

.metric-good { background: linear-gradient(135deg, #059669, #047857); }
.metric-fair { background: linear-gradient(135deg, #d97706, #b45309); }
.metric-poor { background: linear-gradient(135deg, #dc2626, #b91c1c); }

.metric-card h4 {
    font-size: 1.25rem;
    font-weight: 700;
    color: #0f172a;
    margin-bottom: 0.5rem;
}

.metric-desc {
    color: #64748b;
    line-height: 1.6;
    margin-bottom: 1rem;
    font-size: 0.9375rem;
}

.metric-values {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    font-size: 0.8125rem;
    font-weight: 600;
}

.mv-good { color: #059669; }
.mv-fair { color: #d97706; }
.mv-poor { color: #dc2626; }

.score-bars {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin: 1.5rem 0;
}

.score-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    border-radius: 0.75rem;
    color: white;
    font-weight: 600;
}

.score-bar span:first-child {
    font-weight: 800;
    font-size: 1.125rem;
}

.sb-good { background: linear-gradient(135deg, #059669, #047857); }
.sb-fair { background: linear-gradient(135deg, #d97706, #b45309); }
.sb-poor { background: linear-gradient(135deg, #dc2626, #b91c1c); }

.problems-article {
    margin: 2rem 0;
}

.problem-article-item {
    background: white;
    border-radius: 1rem;
    padding: 2rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    border: 1px solid #e2e8f0;
    border-left: 5px solid #1e40af;
}

.problem-article-item h3 {
    color: #0f172a;
    margin-top: 0;
}

.problem-article-item p {
    margin-bottom: 0.75rem;
}

.stats-article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.stat-article-card {
    background: linear-gradient(135deg, #1e40af, #1e3a8a);
    color: white;
    border-radius: 1rem;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 4px 20px rgba(30, 64, 175, 0.3);
}

.stat-article-card .stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.stat-article-card p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.9375rem;
    line-height: 1.5;
    margin: 0;
}

.comparison-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background: white;
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    margin: 2rem 0;
}

.comparison-table thead th {
    background: #1e40af;
    color: white;
    padding: 1rem 1.25rem;
    text-align: left;
    font-weight: 700;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.comparison-table tbody td {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid #f1f5f9;
    color: #475569;
    line-height: 1.5;
    font-size: 0.9375rem;
    vertical-align: top;
}

.comparison-table tbody tr:last-child td {
    border-bottom: none;
}

.comparison-table tbody tr:hover {
    background: #f8fafc;
}

.comparison-table tbody tr:last-child {
    background: #f0f9ff;
}

.comparison-table tbody tr:last-child td {
    font-weight: 600;
    color: #1e40af;
}

.steps-article {
    margin: 2rem 0;
}

.step-article-item {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
    background: white;
    border-radius: 1rem;
    padding: 2rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    border: 1px solid #e2e8f0;
}

.step-number {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, #1e40af, #1e3a8a);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.25rem;
}

.step-article-item h4 {
    font-size: 1.125rem;
    font-weight: 700;
    color: #0f172a;
    margin: 0 0 0.5rem;
}

.step-article-item p {
    margin: 0;
    font-size: 0.9375rem;
}

.faq-section {
    margin: 2rem 0;
}

.faq-item {
    background: white;
    border: 1px solid #e2e8f0;
    border-radius: 0.75rem;
    margin-bottom: 0.75rem;
    overflow: hidden;
}

.faq-question {
    padding: 1.25rem 1.5rem;
    margin: 0;
    font-size: 1.0625rem;
    font-weight: 700;
    color: #0f172a;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background 0.2s;
    user-select: none;
}

.faq-question::after {
    content: '+';
    font-size: 1.5rem;
    font-weight: 300;
    color: #64748b;
    flex-shrink: 0;
    margin-left: 1rem;
    transition: transform 0.3s;
}

.faq-item.open .faq-question::after {
    content: '−';
}

.faq-question:hover {
    background: #f8fafc;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.open .faq-answer {
    max-height: 500px;
    padding: 0 1.5rem 1.25rem;
}

.faq-answer p {
    color: #475569;
    line-height: 1.7;
    margin: 0;
}

.seo-content-section {
    padding: 3rem 1.5rem;
    margin-top: 2rem;
    border-top: 1px solid #e2e8f0;
}

.seo-content-section h2 {
    text-align: center;
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 800;
    color: #0f172a;
    margin-bottom: 2rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    max-width: 900px;
    margin: 0 auto;
}

.stat-card {
    background: white;
    border-radius: 1rem;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    border: 1px solid #e2e8f0;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
}

.stat-card .stat-icon {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
}

.stat-card .stat-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: #0f172a;
    margin-bottom: 0.5rem;
}

.stat-card .stat-label {
    color: #64748b;
    font-size: 0.875rem;
    line-height: 1.5;
}

@media (max-width: 768px) {
    .article-content {
        padding: 2rem 1rem;
    }

    .metrics-grid {
        grid-template-columns: 1fr;
    }

    .stats-article-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .step-article-item {
        flex-direction: column;
        gap: 1rem;
    }

    .step-number {
        width: 40px;
        height: 40px;
        font-size: 1.125rem;
    }

    .comparison-table {
        display: block;
        overflow-x: auto;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .stats-article-grid {
        grid-template-columns: 1fr;
    }

    .problem-article-item {
        padding: 1.25rem;
    }

    .metric-card {
        padding: 1.5rem;
    }

    .score-bar {
        flex-direction: column;
        text-align: center;
        gap: 0.25rem;
    }
}