:root{--bg:#ffffff;--bg-soft:#f6f8f7;--text:#14201b;--text-muted:#5b6b62;--border:#dfe7e2;--primary:#0e7c4a;--primary-dark:#0a5f39;--primary-soft:#e7f4ec;--warn:#b3261e;--warn-bg:#fdecea;--radius:12px;--maxw:1120px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}a{color:var(--primary)}a:hover{color:var(--primary-dark)}.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}.site-header{border-bottom:1px solid var(--border);background:#fff;position:-webkit-sticky;position:sticky;top:0;z-index:50}.site-header .container{gap:28px;height:60px}.brand,.site-header .container{display:flex;align-items:center}.brand{gap:8px;font-weight:700;font-size:17px;color:var(--text);text-decoration:none;white-space:nowrap}.brand svg{flex:none}.main-nav{display:flex;gap:20px;margin-left:auto;font-size:14.5px}.main-nav a{color:var(--text-muted);text-decoration:none}.main-nav a:hover{color:var(--primary)}@media (max-width:720px){.main-nav{gap:12px;font-size:13px}.site-header .container{gap:12px}}.hero{padding:28px 0 8px}.hero h1{font-size:clamp(28px,4.5vw,40px);line-height:1.2;margin:0 0 8px;letter-spacing:-.5px}.hero .sub{color:var(--text-muted);font-size:17px;margin:0 0 20px;max-width:720px}.section{padding:36px 0}.section h2{font-size:24px;margin:0 0 12px;letter-spacing:-.3px}.section .lede{color:var(--text-muted);margin:0 0 20px;max-width:760px}.site-footer{border-top:1px solid var(--border);background:var(--bg-soft);margin-top:24px;padding:32px 0;font-size:14px;color:var(--text-muted)}.site-footer p{margin:0 0 10px;max-width:860px}.site-footer .sources{margin-top:14px}.site-footer .sources a{margin-right:16px}.breadcrumb{font-size:13.5px;color:var(--text-muted);margin:14px 0 0}.breadcrumb a{color:var(--text-muted);text-decoration:none}.breadcrumb a:hover{text-decoration:underline}.breadcrumb .sep{margin:0 6px}.guide{max-width:860px}.guide .lede{font-size:17.5px;color:var(--text);margin:0 0 18px}.guide p{margin:0 0 14px}.guide h2{font-size:24px;margin:34px 0 12px;letter-spacing:-.3px}.guide h3{font-size:18px;margin:22px 0 8px}.guide ol,.guide ul{margin:0 0 14px;padding-left:22px}.guide li{margin-bottom:6px}.answer-box{border:1px solid var(--border);border-left:4px solid var(--primary);border-radius:8px;background:var(--primary-soft);padding:16px 18px;margin:18px 0 8px;font-size:16px}.answer-box strong{color:var(--primary-dark)}.callout{border:1px solid var(--border);border-radius:var(--radius);background:var(--bg-soft);padding:16px 18px;margin:18px 0;font-size:15px}.callout.warn{border-color:#f0c9c5;background:var(--warn-bg)}.callout p{margin:0 0 8px}.callout p:last-child{margin-bottom:0}.guide .src{font-size:13px;color:var(--text-muted)}.ad-slot{display:flex;align-items:center;justify-content:center;background:var(--bg-soft);border:1px dashed var(--border);border-radius:8px;margin:20px auto;max-width:100%;overflow:hidden}.ad-slot-label{font-size:12px;color:var(--text-muted);letter-spacing:1px;text-transform:uppercase}.ad-slot-a{height:90px;max-width:728px}@media (max-width:720px){.ad-slot-a{height:100px;max-width:340px}}.ad-slot-b{height:250px;max-width:336px;margin-top:16px}.ad-slot-c{height:280px;max-width:336px}@media (max-width:720px){.ad-slot-c{height:250px;max-width:320px}}