.article {
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.7;
    color: #1f2937;
}

.article *,
.article *::before,
.article *::after {
    box-sizing: border-box;
}


.article {
    max-width: 980px;
    margin: 48px auto;
    background: #ffffff;
    padding: 56px 44px;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(16, 24, 40, 0.08);
}


.article header {
    text-align: center;
    padding-bottom: 28px;
    margin-bottom: 36px;
    border-bottom: 1px solid #eaeef5;
}

.article h1 {
    font-size: 2.6rem;
    font-weight: 800;
    color: #0f172a;
    letter-spacing: -0.02em;
}


.article .toc {
    background: linear-gradient(180deg, #f8fafc, #ffffff);
    border: 1px solid #e6edf5;
    border-radius: 14px;
    padding: 22px 24px;
    margin-bottom: 36px;
}

.article .toc h2 {
    font-size: 1.2rem;
    margin-bottom: 12px;
    color: #0f172a;
    border-left: 4px solid #3b82f6;
    padding-left: 10px;
}

.article .toc a {
    color: #2563eb;
    text-decoration: none;
    transition: 0.2s;
}

.article .toc a:hover {
    color: #0ea5e9;
    transform: translateX(4px);
}


.article h2 {
    font-size: 1.8rem;
    margin: 44px 0 18px;
    color: #0f172a;
    border-bottom: 1px solid #eef2f7;
    padding-bottom: 10px;
}

.article h3 {
    font-size: 1.35rem;
    margin: 26px 0 12px;
    color: #111827;
}


.article p {
    margin-bottom: 16px;
    font-size: 1.05rem;
    color: #374151;
}

.article strong {
    color: #0f172a;
}


.article ul,
.article ol {
    padding-left: 26px;
    margin-bottom: 18px;
}

.article li {
    margin-bottom: 8px;
}


.article table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: 30px 0;
    font-size: 0.95rem;
    border: 1px solid #e6edf5;
    border-radius: 12px;
    overflow: hidden;
    background: #fff;
}

.article thead {
    background: #0f172a;
    color: #ffffff;
}

.article th,
.article td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid #eef2f7;
}

.article tbody tr:hover {
    background: #f8fafc;
}


.article details.faq-item {
    background: #ffffff;
    border: 1px solid #e6edf5;
    border-radius: 12px;
    padding: 18px 20px;
    margin-bottom: 14px;
    box-shadow: 0 2px 10px rgba(16,24,40,0.04);
}

.article details summary {
    cursor: pointer;
    font-weight: 600;
    color: #1f2d3d;
    list-style: none;
    outline: none;
}

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

.article details summary::after {
    content: "＋";
    float: right;
    color: #3b82f6;
    font-weight: bold;
}

.article details[open] summary::after {
    content: "−";
}

.article details p {
    margin-top: 10px;
    color: #374151;
    line-height: 1.6;
}


.article a {
    color: #2563eb;
    text-decoration: none;
}

.article a:hover {
    color: #0ea5e9;
}
.article img {
    display: block;
    max-width: min(700px, 100%);
    border: 1px solid #eee;
    height: auto;
    margin: 16px auto;
    border-radius: 10px;
    box-shadow: 0 6px 18px rgba(0,0,0,0.08);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.article img:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 24px rgba(0,0,0,0.12);
}

@media (max-width: 768px) {

    .article {
        padding: 28px 20px;
    }

    .article h1 {
        font-size: 2rem;
    }
}