:root{--primary:#3B5BDB;--primary-d:#2B44B0;--bg:#F5F7FB;--surface:#fff;--text:#16203A;--sub:#5B6680;--muted:#9AA3B8;--border:#E3E8F2;--mint:#12B886}
@media (prefers-color-scheme:dark){:root{--bg:#0E1630;--surface:#172247;--text:#EEF2FA;--sub:#B5BED3;--muted:#8791AB;--border:#2A3766}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Apple SD Gothic Neo","Pretendard","Noto Sans KR","Malgun Gothic",sans-serif;line-height:1.75;font-size:16px;word-break:keep-all;overflow-wrap:anywhere}
a{color:var(--primary)}
@media (prefers-color-scheme:dark){a{color:#91A7FF}}
header.top{background:linear-gradient(135deg,#2F4AC8,#4C6EF5 60%,#4DABF7);color:#fff;padding:28px 16px 36px}
header.top .wrap{display:flex;align-items:center;gap:14px}
header.top img{width:52px;height:52px;border-radius:14px}
header.top .brand{font-weight:900;font-size:22px;letter-spacing:-.3px}
header.top .brand small{display:block;font-weight:600;font-size:13px;opacity:.85}
.wrap{max-width:760px;margin:0 auto}
main{padding:0 16px 48px}
.card{background:var(--surface);border:1px solid var(--border);border-radius:20px;padding:24px 20px;margin-top:-18px;box-shadow:0 6px 18px rgba(27,43,90,.06)}
h1{font-size:26px;line-height:1.35;margin:0 0 6px;letter-spacing:-.5px}
.meta{color:var(--muted);font-size:14px;margin-bottom:18px}
h2{font-size:19px;margin:32px 0 8px;padding-top:6px;letter-spacing:-.3px}
h3{font-size:16px;margin:18px 0 6px}
p,li{color:var(--text)}
ul,ol{padding-left:22px}
li{margin:4px 0}
table{width:100%;border-collapse:collapse;margin:10px 0;font-size:14.5px;display:block;overflow-x:auto}
th,td{border:1px solid var(--border);padding:8px 10px;text-align:left;vertical-align:top;min-width:110px}
th{background:rgba(59,91,219,.08)}
.toc{background:rgba(59,91,219,.06);border-radius:14px;padding:14px 18px;font-size:15px}
.toc ol{margin:0}
.note{background:rgba(18,184,134,.1);border-radius:12px;padding:12px 14px;font-size:15px}
footer{color:var(--muted);font-size:13px;text-align:center;padding:24px 16px 40px}
.btns{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.btn{display:inline-block;padding:12px 18px;border-radius:14px;background:var(--primary);color:#fff;text-decoration:none;font-weight:800}
.btn.ghost{background:transparent;color:var(--primary);border:1.5px solid var(--border)}