:root{--bg:#e9edf2;--surface:#fbfcfd;--ink:#1a2230;--muted:#5b6677;--line:#d3dae3;--accent:#2b4787;--marker:#ffdf3d}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){--bg:#141920;--surface:#1c232d;--ink:#e5e9ef;--muted:#9aa5b4;--line:#2d3644;--accent:#8eaef0;--marker:#e9c832}}
:root[data-theme="dark"]{--bg:#141920;--surface:#1c232d;--ink:#e5e9ef;--muted:#9aa5b4;--line:#2d3644;--accent:#8eaef0;--marker:#e9c832}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font-family:"Zen Kaku Gothic New","Hiragino Kaku Gothic ProN","Yu Gothic","Noto Sans JP",system-ui,sans-serif;font-size:15px;line-height:1.85}
header{background:var(--surface);border-bottom:1px solid var(--line);padding:12px 16px}
header .in{max-width:820px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.brand{font-family:"Shippori Mincho B1","Hiragino Mincho ProN",serif;font-weight:700;font-size:20px;color:var(--ink);text-decoration:none}
.brand span{background:linear-gradient(transparent 55%,var(--marker) 55%);padding:0 2px}
.open{background:var(--accent);color:#fff;text-decoration:none;border-radius:8px;padding:6px 14px;font-size:14px}
main{max-width:820px;margin:0 auto;padding:24px 16px 48px}
article{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:20px 24px}
h1{font-family:"Shippori Mincho B1","Hiragino Mincho ProN",serif;font-size:26px;line-height:1.4;margin:0 0 8px}
h2{font-size:18px;margin:28px 0 6px;padding-left:10px;border-left:4px solid var(--marker)}
h3{font-size:16px;margin:18px 0 4px}
p,li{margin:0 0 10px}
ul,ol{padding-left:1.4em}
.muted{color:var(--muted);font-size:13px}
a{color:var(--accent)}
mark{background:linear-gradient(transparent 50%,var(--marker) 50%);color:inherit}
table{border-collapse:collapse;width:100%;font-size:14px;margin:8px 0 14px}
th,td{border:1px solid var(--line);padding:6px 10px;text-align:left;vertical-align:top}
th{background:var(--bg)}
footer{max-width:820px;margin:0 auto;padding:0 16px 32px;font-size:12.5px;color:var(--muted);display:flex;gap:14px;flex-wrap:wrap}
footer a{color:var(--muted)}
@media (max-width:560px){article{padding:16px}h1{font-size:22px}}