/* v31 共享：顶栏下拉、语言切换、静态页/日主页/英文页排版 */
.xt-nav{display:flex;align-items:center;gap:8px}
.xt-nav>a,.xt-nav .dd>button{position:relative;display:inline-flex;align-items:center;height:40px;padding:0 14px;border:0;background:none;color:var(--ink);font:600 15px/1 var(--xt-head,serif)!important;letter-spacing:.04em;text-decoration:none;white-space:nowrap;cursor:pointer;border-radius:2px}
.xt-nav .dd>button::before{content:"";order:2;width:5px;height:5px;margin-left:8px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:translateY(-2px) rotate(45deg);opacity:.6}
.xt-nav>a::after,.xt-nav .dd>button::after{content:"";position:absolute;left:14px;right:14px;bottom:2px;height:2px;background:currentColor;transform:scaleX(0);transition:transform .2s}
.xt-nav .dd>button::after{right:27px}
.xt-nav [aria-current="page"]::after{transform:scaleX(1)}
.xt-nav>a:hover,.xt-nav .dd>button:hover,.xt-nav .dd.open>button{background:var(--line,rgba(0,0,0,.06))}
.xt-nav .dd{position:relative}.xt-nav .menu{display:none;position:absolute;top:calc(100% + 6px);left:0;min-width:200px;padding:6px;background:var(--bg,#faf7f0);border:1px solid var(--line);box-shadow:0 12px 32px rgba(0,0,0,.12);z-index:60}
.xt-nav .dd.open .menu{display:block}.xt-nav .menu a{display:block;padding:10px 12px;color:var(--ink);text-decoration:none;font-size:15px}.xt-nav .menu a:hover,.xt-nav .menu a:focus{background:var(--line,rgba(0,0,0,.06));outline:0}
.xt-lang{display:inline-flex;gap:12px;align-items:center;font-size:13px}.xt-lang a{color:inherit;text-decoration:none;opacity:.7}.xt-lang a[aria-current]{opacity:1;font-weight:600;text-decoration:underline;text-underline-offset:3px}
.xt-home-lang{margin-left:12px}
.mods-g{grid-column:1/-1;display:flex;align-items:baseline;gap:14px;margin:32px 0 0;padding-top:14px;border-top:1px solid var(--line);font-size:22px}.mods-g:first-child{margin-top:0}.mods-g a{color:inherit;text-decoration:none}.mods-g small{font-size:13px;color:var(--mute,#888);font-weight:400}
.xt-page .top{display:flex;align-items:center;gap:20px;flex-wrap:wrap}.xt-page .top .xt-nav{margin:0 auto}
.xt-main{max-width:1100px;margin:0 auto;padding:24px 24px 80px;line-height:1.85}
.xt-main h1{font-size:clamp(32px,5vw,52px);line-height:1.15;margin:16px 0 12px}.xt-main h2{font-size:24px;margin:40px 0 12px}.xt-main h3{font-size:18px;margin:24px 0 8px}
.xt-main .lead{font-size:18px;max-width:720px;color:var(--ink)}
.xt-article{max-width:760px}.xt-article p,.xt-article li{font-size:16px}.xt-article table{border-collapse:collapse;width:100%;margin:12px 0}.xt-article th,.xt-article td{border-top:1px solid var(--line);padding:8px 10px;text-align:left;vertical-align:top;font-size:15px}.xt-article th{white-space:nowrap;font-weight:600;width:8em}
.xt-article blockquote{margin:16px 0;padding:8px 0 8px 18px;border-left:3px solid var(--c,var(--accent));font-size:18px}
.xt-crumbs{font-size:13px;color:var(--mute,#888)}.xt-crumbs a{color:inherit}
.xt-cta{margin:48px 0 24px;padding:24px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.xt-cta h2{margin-top:0}
.xt-cta-line{margin:20px 0 4px}.xt-note{font-size:14px;color:var(--mute,#888)}
.xt-links a,.xt-pn a{margin-right:16px;color:inherit}.xt-pn{display:flex;justify-content:space-between;margin-top:32px;font-size:15px}
.xt-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:0 24px;margin:24px 0}.xt-grid a{display:block;padding:18px 0;border-top:1px solid var(--line);color:inherit;text-decoration:none}.xt-grid b{display:block;font:600 19px/1.3 var(--xt-head,serif)!important;margin-bottom:6px}.xt-grid span{font-size:14px;color:var(--mute,#888);line-height:1.7}
.rz-fig{float:right;display:flex;gap:8px;width:min(46%,360px);margin:8px 0 16px 24px}.rz-fig img{width:50%;height:auto;aspect-ratio:3/4;object-fit:cover}
.xt-page .dm{margin:24px 0}.xt-hero{padding:24px 0}
@media(max-width:760px){.rz-fig{float:none;width:100%;margin:8px 0}.xt-page .top .xt-nav{order:3;width:100%;overflow-x:auto;margin:0}.xt-nav>a,.xt-nav .dd>button{padding:0 10px}.xt-main{padding:16px 16px 96px}}
.top .xt-nav{gap:8px;flex:1}.top .xt-nav>a,.top .xt-nav a{border-bottom:0!important}.top .xt-nav>a{padding:0 14px;line-height:1}.top .xt-lang{flex:0 0 auto;gap:12px}.top .xt-lang a{padding:0!important;border:0!important}
.xt-mnav{display:none}@media(max-width:760px){.xt-page .top .xt-nav{display:none}.xt-mnav{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:50;background:var(--bg,#faf7f0);border-top:1px solid var(--line);justify-content:space-around;padding:8px 0 calc(8px + env(safe-area-inset-bottom))}.xt-mnav a{color:var(--ink);text-decoration:none;font-size:14px;padding:6px 8px}.xt-mnav a[aria-current]{font-weight:700}}