body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    color: #333;
}
h1 {
    color: #2c3e50;
    border-bottom: 2px solid #3498db;
    padding-bottom: 10px;
}
h2 {
    color: #2c3e50;
    margin-top: 40px;
}
h3 {
    color: #2c3e50;
}
.step {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 5px;
    margin: 20px 0;
}
.warning {
    background: #fff3cd;
    border-left: 4px solid #ffc107;
    padding: 15px;
    margin: 20px 0;
}
code {
    background: #f8f9fa;
    padding: 2px 6px;
    border-radius: 3px;
    font-family: Monaco, Consolas, monospace;
}
.code-block {
    background: #2c3e50;
    color: #fff;
    padding: 15px;
    border-radius: 5px;
    font-family: Monaco, Consolas, monospace;
    overflow-x: auto;
    white-space: pre;
    font-size: 13px;
    line-height: 1.7;
    margin: 15px 0;
}
.code-block .cm { color: #95a5a6; }
img {
    max-width: 100%;
    height: auto;
    margin: 20px 0;
    border: 1px solid #ddd;
    border-radius: 5px;
}
.lead {
    background: #eaf4fb;
    border-left: 4px solid #3498db;
    padding: 15px;
    margin: 20px 0;
}
.lead p:last-child { margin-bottom: 0; }

/* どこで作業するのかを示すラベル */
.who {
    display: inline-block;
    font-size: 13px;
    font-weight: bold;
    padding: 4px 12px;
    border-radius: 3px;
    letter-spacing: 0.02em;
}
.who.mac { background: #e8f0fe; color: #1a55b8; border: 1px solid #b8cdf0; }
.who.win { background: #fdf0e6; color: #a05a12; border: 1px solid #f0d4b0; }
.whobar {
    margin: 20px 0;
    padding: 12px 15px;
    background: #f8f9fa;
    border-radius: 5px;
    font-size: 14px;
}
.whobar .who { margin-right: 10px; }

/* トップページのエラー3択 */
.choices {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin: 25px 0;
}
.choices > a {
    flex: 1 1 220px;
    background: #f8f9fa;
    border: 1px solid #ddd;
    border-radius: 5px;
    padding: 20px;
    text-decoration: none;
    color: #333;
    display: block;
    transition: border-color 0.15s, background 0.15s;
}
.choices > a:hover {
    border-color: #3498db;
    background: #f0f7fc;
}
.choices .tag {
    display: inline-block;
    background: #3498db;
    color: #fff;
    font-size: 12px;
    font-weight: bold;
    padding: 2px 10px;
    border-radius: 3px;
    margin-bottom: 10px;
}
.choices .label {
    font-weight: bold;
    color: #2c3e50;
    margin: 0 0 10px;
    font-size: 15px;
    line-height: 1.5;
}
.choices img {
    margin: 0 0 12px;
}
.choices .desc {
    font-size: 14px;
    margin: 0;
    color: #555;
}
.choices .go {
    display: block;
    margin-top: 12px;
    color: #3498db;
    font-weight: bold;
    font-size: 14px;
}

/* 制作者向けへの導線 */
.forauthor, .forplayer {
    border: 1px solid #ddd;
    border-radius: 5px;
    padding: 20px;
    margin: 40px 0 0;
    background: #fafbfc;
}
.forauthor h3, .forplayer h3 { margin-top: 0; }
.forauthor p:last-child, .forplayer p:last-child { margin-bottom: 0; }

/* 結論を目立たせる箱 */
.answer {
    background: #f0f7f0;
    border: 2px solid #27ae60;
    border-radius: 5px;
    padding: 20px;
    margin: 20px 0;
}
.answer h3 { margin-top: 0; color: #1e7e46; }
.answer p:last-child { margin-bottom: 0; }

/* 壊れている状態と正常な状態の対比 */
.compare {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin: 20px 0;
}
.compare > div {
    flex: 1 1 320px;
    border: 1px solid #ddd;
    border-radius: 5px;
    padding: 15px;
    overflow-x: auto;
}
.compare .head { font-weight: bold; font-size: 14px; margin: 0 0 10px; }
.compare .ng .head { color: #c0392b; }
.compare .ok .head { color: #27ae60; }
.compare pre {
    margin: 0;
    font-family: Monaco, Consolas, monospace;
    font-size: 12px;
    line-height: 1.8;
    white-space: pre;
}
.compare .ng em { color: #c0392b; font-style: normal; font-weight: bold; }
.compare .ok em { color: #27ae60; font-style: normal; font-weight: bold; }

table {
    border-collapse: collapse;
    width: 100%;
    margin: 20px 0;
    font-size: 14px;
}
th, td {
    border: 1px solid #ddd;
    padding: 10px;
    text-align: left;
    vertical-align: top;
}
th { background: #f8f9fa; color: #2c3e50; }

details {
    border: 1px solid #ddd;
    border-radius: 5px;
    padding: 15px 20px;
    margin: 20px 0;
}
details summary {
    cursor: pointer;
    font-weight: bold;
    color: #2c3e50;
}
details[open] summary { margin-bottom: 15px; }

.refs li { margin-bottom: 12px; }

.backlink {
    margin-top: 40px;
    font-size: 14px;
}

footer {
    margin-top: 40px;
    padding-top: 15px;
    border-top: 1px solid #ddd;
    font-size: 14px;
    color: #666;
}

/* ダウンロードボタン */
.dlbtn {
    display: inline-block;
    background: #27ae60;
    color: #fff;
    text-decoration: none;
    padding: 12px 24px;
    border-radius: 5px;
    font-weight: bold;
    font-size: 16px;
    margin: 10px 0 5px;
    transition: background 0.15s;
}
.dlbtn:hover { background: #1e8e4f; color: #fff; }
.dlnote {
    font-size: 13px;
    color: #666;
    margin: 0;
}