:root{--navy:#193b57;--blue:#2374d8;--blue2:#eaf3ff;--pink:#f04b78;--ink:#18324b;--muted:#65788c;--text:#4d6377;--line:#d6e2ee;--bg:#edf4fb;--card:#fff;--shadow:0 8px 28px rgba(20,52,80,.08)}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink)}
a{color:var(--blue)}
img{max-width:100%}

/* Layout */
.nav-shell{min-height:100vh;display:flex}
.sidebar{width:220px;flex:0 0 220px;background:var(--navy);color:#fff;padding:18px 10px;display:flex;flex-direction:column;position:sticky;top:0;height:100vh;overflow-y:auto}
.sidebar-brand{display:block;padding:8px 10px 18px;border-bottom:1px solid rgba(255,255,255,.14);margin-bottom:14px;text-align:center}
.sidebar-brand img{width:110px;height:110px;object-fit:contain;background:#fff;border-radius:16px;display:inline-block}
.sidebar-brand span{display:block;margin-top:10px;font-weight:800;color:#fff;font-size:15px}
.sidebar-nav{display:flex;flex-direction:column;gap:4px}
.sidebar-btn{display:block;border:0;background:transparent;color:#eaf3fb;padding:10px 14px;border-radius:10px;text-align:left;font-weight:700;text-decoration:none;font-size:14px}
.sidebar-btn:hover{background:rgba(255,255,255,.08)}
.sidebar-btn.active{background:#fff;color:var(--navy)}
.nav-label{font-size:10px;letter-spacing:.08em;text-transform:uppercase;color:#9fb6ca;padding:12px 14px 4px;font-weight:800}
.sidebar-footer{margin-top:auto;font-size:10px;line-height:1.45;color:#b9c9d8;padding:12px}
.public-main{flex:1;min-width:0;display:flex;flex-direction:column}
.page{flex:1;padding:40px 28px 48px}
.container{max-width:1050px;margin:0 auto}

/* Content cards & typography */
.info-card{background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:34px 38px}
.info-card h1{margin:0 0 10px;color:var(--navy);font-size:30px;line-height:1.25}
.info-card h2{color:var(--navy);margin:30px 0 10px;font-size:22px}
.info-card h3{color:var(--navy);margin:22px 0 8px;font-size:17px}
.info-card p,.info-card li,.info-card td,.info-card th{color:var(--text);line-height:1.75;font-size:15.5px}
.info-card ul,.info-card ol{padding-left:22px}
.byline{font-size:13px;color:var(--muted);margin:0 0 22px;padding-bottom:16px;border-bottom:1px solid var(--line)}
.lead{font-size:17px!important;color:#3d5468!important}
.callout{border-left:4px solid var(--blue);background:#f2f7ff;padding:14px 18px;border-radius:10px;margin:18px 0}
.callout.warn{border-left-color:#c77700;background:#fff8ec}
.callout p{margin:6px 0}
.formula{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:#f4f8fc;border:1px solid var(--line);border-radius:10px;padding:12px 14px;overflow-x:auto;font-size:14px;color:#1d3044}
.data-table{width:100%;border-collapse:collapse;margin:12px 0 6px}
.data-table th,.data-table td{border:1px solid var(--line);padding:8px 10px;text-align:left;font-size:14.5px!important}
.data-table th{background:#f4f8fc;color:var(--navy)}
.table-scroll{overflow-x:auto}
.toc{background:#f7fbff;border:1px solid var(--line);border-radius:12px;padding:14px 20px;margin:0 0 18px}
.toc strong{color:var(--navy)}
.toc ol{margin:6px 0 0}
.refs li{font-size:14px!important}
.related{margin-top:30px;padding-top:18px;border-top:1px solid var(--line)}
.card-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:14px}
.link-card{display:block;border:1px solid var(--line);border-radius:12px;padding:16px;background:#fbfdff;text-decoration:none;transition:border-color .15s,box-shadow .15s}
.link-card:hover{border-color:#9cc1e8;box-shadow:0 4px 14px rgba(20,52,80,.08)}
.link-card strong{display:block;color:var(--navy);margin-bottom:4px}
.link-card span{color:var(--text);font-size:14px;line-height:1.6}
.btn-link{display:inline-block;background:var(--blue);color:#fff;text-decoration:none;font-weight:800;padding:12px 20px;border-radius:11px;margin-top:6px}
.btn-link.secondary{background:#edf3f9;color:var(--ink);margin-left:8px}
details{border:1px solid var(--line);border-radius:12px;padding:12px 16px;margin:10px 0;background:#fbfdff}
details summary{cursor:pointer;font-weight:800;color:var(--navy);font-size:15.5px}
details p{margin:10px 0 2px}

/* Home */
.home-hero{display:grid;grid-template-columns:260px 1fr;gap:28px;align-items:center;margin-bottom:22px}
.home-hero img{width:260px;height:260px;object-fit:contain;background:#fff;border-radius:24px;box-shadow:var(--shadow)}
.home-hero h1{margin:0 0 10px;font-size:34px;color:var(--navy)}
.home-hero p{font-size:17px;line-height:1.7;color:var(--text);margin:0 0 14px}
.home-feature-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:16px}
.home-feature{border:1px solid var(--line);border-radius:12px;padding:16px;background:#fbfdff}
.home-feature strong{display:block;color:var(--navy);margin-bottom:5px}
.home-feature span{color:var(--text);font-size:14.5px;line-height:1.6}

/* Tutorial */
.tutorial-list{display:grid;gap:14px}
.tutorial-step{border:1px solid var(--line);border-radius:12px;padding:16px;background:#fbfdff;color:var(--text);line-height:1.7}
.tutorial-step strong{color:var(--navy)}
.disclaimer-box{border-left:4px solid var(--navy);background:#f7fbff;padding:18px;border-radius:10px}

/* Footer */
.site-footer{padding:22px 28px 30px;text-align:center;font-size:12.5px;color:#718496;line-height:1.8}
.site-footer a{color:#4d6c88;text-decoration:none;margin:0 7px}
.site-footer a:hover{text-decoration:underline}

/* AdSense */
.adsense-slot{display:block;text-align:center;overflow:hidden}
.adsense-sidebar{width:180px;min-height:250px;margin:18px auto 0}
.adsense-inline{margin:26px 0;min-height:100px}

@media(max-width:900px){.home-hero{grid-template-columns:1fr;text-align:center}.home-hero img{width:200px;height:200px;margin:0 auto}}
@media(max-width:700px){
  .nav-shell{display:block}
  .sidebar{position:sticky;top:0;z-index:20;width:100%;height:auto;padding:8px;flex-direction:row;align-items:center}
  .sidebar-brand,.sidebar-footer,.nav-label,.adsense-sidebar{display:none}
  .sidebar-nav{flex:1;min-width:0;flex-direction:row;overflow-x:auto;gap:4px;-webkit-overflow-scrolling:touch;scrollbar-width:none}
  .sidebar-nav::-webkit-scrollbar{display:none}
  .sidebar-btn{white-space:nowrap;padding:9px 12px;font-size:13px}
  .page{padding:18px 12px 30px}
  .info-card{padding:22px 18px}
  .info-card h1{font-size:25px}
  .home-hero h1{font-size:27px}
  .home-feature-grid,.card-grid{grid-template-columns:1fr}
  .btn-link.secondary{margin-left:0;margin-top:8px}
}
@media print{.sidebar,.site-footer,.adsense-slot{display:none!important}}