* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: #F9FAFB;
    color: #1F2937;
    line-height: 1.6;
    font-size: 16px;
}

.knowledge-base-header {
    border-bottom: 1px solid #E5E7EB;
    padding: 24px 0;
    background-color: #FFFFFF;
}

.knowledge-base-header .site-name {
    font-size: 24px;
    font-weight: 600;
    color: #1F2937;
    margin-left: 5%;
    max-width: 90%;
}

.knowledge-base-main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 5%;
}

.navigation-menu {
    margin-bottom: 40px;
    border-bottom: 1px solid #E5E7EB;
    padding-bottom: 20px;
}

.navigation-menu summary {
    font-weight: 500;
    cursor: pointer;
    color: #2563EB;
    list-style: none;
}

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

.navigation-menu summary::before {
    content: '▶ ';
    display: inline-block;
    margin-right: 8px;
    transition: transform 0.2s;
}

.navigation-menu[open] summary::before {
    transform: rotate(90deg);
}

.navigation-menu ul {
    margin-top: 16px;
    margin-left: 24px;
    list-style-type: disc;
}

.navigation-menu li {
    margin-bottom: 8px;
}

.content-wrapper {
    display: flex;
    flex-direction: column;
    gap: 48px;
}

.through-line-block {
    background-color: #FFFFFF;
    padding: 32px;
    border: 1px solid #E5E7EB;
}

.section-label {
    font-size: 20px;
    font-weight: 600;
    color: #1F2937;
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 1px solid #E5E7EB;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 16px;
}

.data-table thead {
    background-color: #2563EB;
    color: #FFFFFF;
}

.data-table th {
    padding: 12px 16px;
    text-align: left;
    font-weight: 500;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.data-table td {
    padding: 12px 16px;
    border-bottom: 1px solid #E5E7EB;
}

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

.data-table tbody tr:hover {
    background-color: #F9FAFB;
}

.reference-gallery {
    margin: 32px 0;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-top: 24px;
}

.gallery-grid img {
    width: 100%;
    height: auto;
    display: block;
    border: 1px solid #E5E7EB;
    transition: border-color 0.2s;
}

.gallery-grid img:hover {
    border-color: #2563EB;
}

.checklist-module {
    background-color: #FFFFFF;
    padding: 32px;
    border: 1px solid #E5E7EB;
}

.equipment-list {
    list-style-type: none;
    margin-top: 16px;
}

.equipment-list li {
    padding: 12px 0;
    border-bottom: 1px solid #E5E7EB;
    position: relative;
    padding-left: 24px;
}

.equipment-list li:last-child {
    border-bottom: none;
}

.equipment-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: #2563EB;
    font-weight: bold;
    font-size: 20px;
}

.knowledge-base-footer {
    border-top: 1px solid #E5E7EB;
    padding: 32px 5%;
    background-color: #FFFFFF;
    margin-top: 60px;
    text-align: center;
}

.knowledge-base-footer p {
    margin-bottom: 8px;
}

.knowledge-base-footer a {
    color: #2563EB;
    text-decoration: none;
}

.knowledge-base-footer a:hover {
    text-decoration: underline;
}

.copyright {
    color: #6B7280;
    font-size: 14px;
    margin-top: 12px;
}

@media (max-width: 768px) {
    .knowledge-base-main {
        padding: 24px 4%;
    }

    .through-line-block {
        padding: 24px;
    }

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

    .data-table {
        font-size: 14px;
    }

    .data-table th,
    .data-table td {
        padding: 8px 12px;
    }
}