/* site.css — style dung chung cho cac trang cong khai cua muaho-web.
   Link file nay TRUOC moi <style> noi bo trong trang (trang cu giu nguyen giao dien). */
:root{--ink:#1a1a1a;--muted:#666;--line:#e5e5e5;--panel:#fafafa;--accent:#c2410c}
*{box-sizing:border-box}
body{font-family:Arial,Helvetica,sans-serif;max-width:720px;margin:0 auto;padding:24px 16px;line-height:1.65;color:var(--ink);background:#fff}
a{color:var(--accent)}
a:visited{color:var(--accent)}
h1{font-size:22px;margin:16px 0 4px}
h2{font-size:17px;margin:28px 0 8px;padding-bottom:4px;border-bottom:1px solid var(--line)}
h3{font-size:15px;margin:18px 0 6px}
p,li{font-size:15px}
ul,ol{padding-left:22px}
.meta{color:var(--muted);font-size:13px;margin-top:0}
.nav{display:flex;flex-wrap:wrap;gap:14px;font-size:14px;padding:8px 0 12px;border-bottom:1px solid var(--line);margin-bottom:4px}
.nav a{text-decoration:none}
.nav a:hover{text-decoration:underline}
table{border-collapse:collapse;width:100%;font-size:14px;margin:8px 0}
th,td{border:1px solid #ddd;padding:6px 8px;text-align:left;vertical-align:top}
th{background:#f7f7f7}
.num{text-align:right;white-space:nowrap}
code{background:#f2f2f2;padding:1px 4px;border-radius:3px;font-size:13px}
.formula{background:var(--panel);border:1px solid var(--line);padding:10px 12px;margin:10px 0;font-family:Consolas,monospace;font-size:13px;overflow-x:auto}
.note{background:var(--panel);border-left:3px solid var(--accent);padding:8px 12px;margin:12px 0;font-size:14px}
.hl{font-weight:bold}
footer{margin-top:32px;padding-top:12px;border-top:1px solid var(--line);color:var(--muted);font-size:13px}