:root{--bg:#111318;--card:#ffffff;--text:#1d2733;--muted:#5a6573;--border:#dbe3ec;--accent:#245d9c;--shadow:0 12px 35px rgba(19,33,52,.08)}
*{box-sizing:border-box} html{scroll-behavior:smooth} body{margin:0;font-family:Arial,Helvetica,sans-serif;background:linear-gradient(180deg,#0f1115 0%,#1a1d24 35%,#232833 65%,#12151b 100%);color:var(--text);line-height:1.65}
a{color:var(--accent)} a:hover{text-decoration:none}
img{max-width:100%;height:auto}
.site-shell{max-width:1120px;margin:0 auto;padding:20px 16px 40px}
.banner{display:block;width:100%;border-radius:22px 22px 0 0;box-shadow:var(--shadow)}
.banner.bottom{border-radius:0 0 22px 22px}
.panel{background:var(--card);box-shadow:var(--shadow);border:1px solid var(--border);border-top:0;border-bottom:0}
.topbar{padding:18px 24px 8px;border-bottom:1px solid var(--border)}
.brand{font-size:clamp(1.35rem,2.6vw,2.2rem);font-weight:700;margin:0 0 8px}
.tagline{margin:0;color:var(--muted);font-size:.98rem}
.nav{display:flex;flex-wrap:wrap;gap:10px;padding:16px 24px;border-bottom:1px solid var(--border);background:#fbfdff}
.nav-link{display:inline-block;padding:10px 14px;border:1px solid var(--border);border-radius:999px;text-decoration:none;color:var(--text);background:#fff;font-size:.95rem}
.nav-link:hover,.nav-link.active{border-color:#b9c9dc;background:#eff5fb}
.content{padding:30px 24px 36px}
.content h1{font-size:clamp(1.8rem,4vw,2.8rem);line-height:1.15;margin:0 0 18px}
.content h2,.content h3{line-height:1.25;margin:28px 0 12px}
.content p{margin:0 0 16px}
.content ul,.content ol{padding-left:22px;margin:0 0 16px}
.content table{display:block;overflow-x:auto;max-width:100%;border-collapse:collapse;margin:16px 0}
.content td,.content th{border:1px solid var(--border);padding:10px;vertical-align:top}
.content hr{border:none;border-top:1px solid var(--border);margin:24px 0}
.content img{display:block;border-radius:16px;margin:14px auto;box-shadow:0 8px 24px rgba(0,0,0,.08)}
.content img[align="left"], .content img[style*="float: left"]{float:left;margin:4px 18px 14px 0;max-width:min(42%,320px)}
.content img[align="right"], .content img[style*="float: right"]{float:right;margin:4px 0 14px 18px;max-width:min(42%,320px)}
.content::after{content:"";display:block;clear:both}
.callout{background:#f7fbff;border:1px solid #d6e6f6;border-radius:18px;padding:18px 18px 2px;margin:18px 0 24px}
.footer-note{padding:0 24px 24px;color:var(--muted);font-size:.92rem}
@media (max-width:720px){.site-shell{padding:10px 10px 30px}.topbar,.nav,.content,.footer-note{padding-left:16px;padding-right:16px}.content img[align="left"],.content img[align="right"],.content img[style*="float: left"],.content img[style*="float: right"]{float:none;max-width:100%;margin:12px auto}}