:root{
  --bg:#ebe8df;
  --app:#f8f7f3;
  --panel:#fffdfa;
  --panel-alt:#f2efe7;
  --text:#151515;
  --muted:#6e695f;
  --line:#ddd7cb;
  --line-strong:#c5bdb0;
  --accent:#171717;
  --accent-text:#fff;
  --ok:#18754a;
  --warn:#8a5b00;
  --danger:#a92424;
  --shadow:0 18px 60px rgba(0,0,0,.10);
  --radius:24px;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Noto Sans KR","Apple SD Gothic Neo","Malgun Gothic",Arial,sans-serif;
}
body[data-theme="light"]{
  --bg:#f3f3f1;--app:#fbfbfa;--panel:#fff;--panel-alt:#f2f2ef;
  --line:#e4e1da;--line-strong:#cbc5bc;--text:#141414;--muted:#68655f;
}
body[data-theme="dark"]{
  --bg:#090909;--app:#131313;--panel:#1d1d1d;--panel-alt:#272727;
  --line:#383838;--line-strong:#565656;--text:#f2f2f2;--muted:#aaa;
  --accent:#f2f2f2;--accent-text:#111;--shadow:0 18px 60px rgba(0,0,0,.36);
}
body[data-font="readable"]{font-family:"Noto Sans KR","Apple SD Gothic Neo","Malgun Gothic",Arial,sans-serif;letter-spacing:-.01em}
body[data-font="rounded"]{font-family:"Arial Rounded MT Bold","Noto Sans KR","Apple SD Gothic Neo",Arial,sans-serif}
body[data-font="serif"]{font-family:Georgia,"Noto Serif KR",serif}
body[data-font="mono"]{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,"Noto Sans KR",monospace}
*{box-sizing:border-box}
html{min-height:100%;background:var(--bg);-webkit-text-size-adjust:100%}
body{margin:0;min-height:100%;background:var(--bg);color:var(--text)}
a{color:inherit}
button{font:inherit;cursor:pointer}
.skip-link{position:fixed;left:12px;top:12px;z-index:1000;padding:10px 13px;border-radius:12px;background:var(--accent);color:var(--accent-text);transform:translateY(-150%);transition:.15s}
.skip-link:focus{transform:none}
.site-shell{width:min(100% - 24px,920px);margin:18px auto;padding:12px;border:1px solid var(--line);border-radius:32px;background:var(--app);box-shadow:var(--shadow)}
.site-header{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px;border:1px solid var(--line);border-radius:22px;background:var(--panel)}
.brand-link{min-width:0;display:flex;align-items:center;gap:10px;text-decoration:none}
.brand-mark{width:40px;height:40px;flex:none;display:grid;place-items:center;border-radius:14px;background:var(--accent);color:var(--accent-text);font-size:12px;font-weight:950;letter-spacing:-.05em}
.brand-copy{min-width:0}
.brand-copy b{display:block;font-size:17px;line-height:1.1;letter-spacing:-.04em}
.brand-copy span{display:block;margin-top:4px;color:var(--muted);font-size:10.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.language-switch{display:inline-flex;align-items:center;gap:2px;padding:3px;border:1px solid var(--line);border-radius:999px;background:var(--panel-alt)}
.language-switch button{min-width:37px;height:30px;padding:0 8px;border:0;border-radius:999px;background:transparent;color:var(--muted);font-size:11px;font-weight:900}
.language-switch button.active{background:var(--accent);color:var(--accent-text)}
.page-main{padding:14px 2px 2px}
.hero{padding:28px 24px;border:1px solid var(--line);border-radius:28px;background:var(--panel)}
.eyebrow{color:var(--muted);font-size:10px;font-weight:950;letter-spacing:.12em;text-transform:uppercase}
.hero h1{margin:8px 0 10px;font-size:clamp(30px,6vw,48px);line-height:1.08;letter-spacing:-.07em}
.hero p{max-width:720px;margin:0;color:var(--muted);font-size:14px;line-height:1.7;word-break:keep-all}
.meta-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px}
.meta-chip{display:inline-flex;align-items:center;min-height:30px;padding:0 10px;border:1px solid var(--line);border-radius:999px;background:var(--panel-alt);color:var(--muted);font-size:10.5px;font-weight:850}
.content-grid{display:grid;gap:12px;margin-top:12px}
.content-card{padding:22px;border:1px solid var(--line);border-radius:24px;background:var(--panel)}
.content-card h2{margin:0 0 10px;font-size:20px;line-height:1.25;letter-spacing:-.04em}
.content-card h3{margin:20px 0 8px;font-size:15px;line-height:1.35}
.content-card p,.content-card li{color:var(--muted);font-size:13px;line-height:1.75;word-break:keep-all}
.content-card p{margin:0 0 10px}
.content-card p:last-child{margin-bottom:0}
.content-card ul,.content-card ol{margin:8px 0 0;padding-left:20px}
.content-card li+li{margin-top:5px}
.notice{padding:14px 15px;border:1px solid var(--line-strong);border-radius:16px;background:var(--panel-alt);font-size:12.5px;line-height:1.65}
.notice strong{color:var(--text)}
.notice.warning{border-color:#dfc98f;background:#fff5d9;color:#6f5212}
body[data-theme="dark"] .notice.warning{border-color:#745d25;background:#2b2517;color:#e6cf96}
.notice.safe{border-color:#b9d6b5;background:#eef8eb;color:#35713a}
body[data-theme="dark"] .notice.safe{border-color:#355e3b;background:#17291a;color:#a7d2aa}
.definition-list{display:grid;gap:8px;margin:0}
.definition-list div{padding:13px 14px;border:1px solid var(--line);border-radius:16px;background:var(--panel-alt)}
.definition-list dt{font-size:12px;font-weight:950}
.definition-list dd{margin:5px 0 0;color:var(--muted);font-size:12px;line-height:1.6}
.feature-grid,.contact-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.feature{padding:16px;border:1px solid var(--line);border-radius:18px;background:var(--panel-alt)}
.feature b{display:block;font-size:13px}
.feature span{display:block;margin-top:6px;color:var(--muted);font-size:11.5px;line-height:1.55}
.contact-card{display:flex;flex-direction:column;min-height:168px;padding:18px;border:1px solid var(--line);border-radius:20px;background:var(--panel-alt)}
.contact-card h2{margin:0 0 7px;font-size:17px}
.contact-card p{margin:0 0 14px;color:var(--muted);font-size:12px;line-height:1.55}
.contact-card .button{margin-top:auto}
.button{min-height:44px;display:inline-flex;align-items:center;justify-content:center;padding:0 14px;border:1px solid var(--accent);border-radius:14px;background:var(--accent);color:var(--accent-text);font-size:12px;font-weight:900;text-decoration:none;text-align:center}
.button.secondary{border-color:var(--line-strong);background:var(--panel);color:var(--text)}
.email-box{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:12px;padding:13px 14px;border:1px solid var(--line);border-radius:16px;background:var(--panel-alt)}
.email-box code{min-width:0;overflow:hidden;text-overflow:ellipsis;font-size:12px;font-weight:850}
.site-footer{margin-top:12px;padding:20px 18px;border:1px solid var(--line);border-radius:24px;background:var(--panel)}
.footer-nav{display:flex;justify-content:center;gap:7px 13px;flex-wrap:wrap}
.footer-nav a{color:var(--muted);font-size:11px;font-weight:850;text-decoration:none}
.footer-nav a:hover,.footer-nav a[aria-current="page"]{color:var(--text);text-decoration:underline}
.footer-note{max-width:680px;margin:14px auto 0;color:var(--muted);font-size:10.5px;line-height:1.55;text-align:center}
[data-lang]{display:none}
html[data-active-lang="ko"] [data-lang="ko"],html[data-active-lang="en"] [data-lang="en"]{display:block}
span[data-lang],strong[data-lang]{display:none}
html[data-active-lang="ko"] span[data-lang="ko"],html[data-active-lang="en"] span[data-lang="en"],html[data-active-lang="ko"] strong[data-lang="ko"],html[data-active-lang="en"] strong[data-lang="en"]{display:inline}
@media(min-width:720px){
  .content-grid.two-column{grid-template-columns:repeat(2,minmax(0,1fr))}
  .content-grid.two-column>.wide{grid-column:1/-1}
}
@media(max-width:640px){
  .site-shell{width:min(100% - 16px,920px);margin:8px auto;padding:8px;border-radius:24px}
  .site-header{padding:8px;border-radius:18px}
  .brand-mark{width:34px;height:34px;border-radius:12px;font-size:10px}
  .brand-copy b{font-size:14px}.brand-copy span{font-size:9.5px}
  .language-switch button{min-width:33px;height:28px}
  .page-main{padding-top:8px}
  .hero{padding:22px 17px;border-radius:22px}
  .hero p{font-size:12.5px;line-height:1.65}
  .content-card{padding:18px 16px;border-radius:20px}
  .feature-grid,.contact-grid{grid-template-columns:1fr}
  .email-box{align-items:flex-start;flex-direction:column}
}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}


.comparison-table{display:grid;gap:1px;overflow:hidden;border:1px solid var(--line);border-radius:18px;background:var(--line)}
.comparison-row{display:grid;grid-template-columns:minmax(95px,.65fr) minmax(180px,1.7fr) minmax(150px,1.2fr);background:var(--panel-alt)}
.comparison-row>*{padding:13px 14px;color:var(--muted);font-size:12px;line-height:1.55}
.comparison-row strong,.comparison-row b{color:var(--text)}
.comparison-head{background:var(--accent)}
.comparison-head>*{color:var(--accent-text)}
.formula-box{display:grid;gap:6px;margin:14px 0;padding:16px;border:1px solid var(--line-strong);border-radius:18px;background:var(--panel-alt)}
.formula-box span{color:var(--muted);font-size:10.5px;font-weight:900;letter-spacing:.06em;text-transform:uppercase}
.formula-box b{font-size:17px;line-height:1.4;letter-spacing:-.03em}
.example-flow{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin:14px 0}
.example-flow>div{display:grid;gap:5px;padding:16px;border:1px solid var(--line);border-radius:18px;background:var(--panel-alt);text-align:center}
.example-flow span{color:var(--muted);font-size:11px;font-weight:850}
.example-flow b{font-size:25px;letter-spacing:-.05em}
.example-flow .result{border-color:var(--line-strong);background:var(--accent);color:var(--accent-text)}
.example-flow .result span{color:var(--accent-text);opacity:.72}
.number-list{list-style:none;margin:12px 0!important;padding:0!important;counter-reset:steps}
.number-list li{position:relative;padding:11px 12px 11px 42px;border:1px solid var(--line);border-radius:14px;background:var(--panel-alt)}
.number-list li+li{margin-top:7px}
.number-list li::before{counter-increment:steps;content:counter(steps);position:absolute;left:11px;top:9px;width:22px;height:22px;display:grid;place-items:center;border-radius:999px;background:var(--accent);color:var(--accent-text);font-size:10px;font-weight:900}
.takeaway{padding:18px;border:1px solid var(--line-strong);border-radius:20px;background:var(--panel-alt)}
.takeaway b{display:block;font-size:17px;line-height:1.55;letter-spacing:-.03em}
.takeaway p{margin-top:10px}
@media(max-width:640px){
  .comparison-table{overflow-x:auto}
  .comparison-row{min-width:620px}
  .example-flow{grid-template-columns:1fr}
}


/* Advanced article system */
.content-grid,.content-card{min-width:0}
.comparison-table,.strategy-table{width:100%;max-width:100%}
.article-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:2px 2px 10px;padding:8px 10px}
.back-to-advanced{display:inline-flex;align-items:center;min-height:36px;padding:0 12px;border:1px solid var(--line);border-radius:999px;background:var(--panel);color:var(--text);font-size:11px;font-weight:900;text-decoration:none}
.back-to-advanced:hover{border-color:var(--line-strong);background:var(--panel-alt)}
.article-series{color:var(--muted);font-size:9.5px;font-weight:950;letter-spacing:.12em}
.related-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}
.related-link{display:flex;flex-direction:column;min-height:110px;padding:15px;border:1px solid var(--line);border-radius:18px;background:var(--panel-alt);text-decoration:none}
.related-link:hover{border-color:var(--line-strong);transform:translateY(-1px)}
.related-link b{font-size:13px;line-height:1.35}
.related-link span{margin-top:7px;color:var(--muted);font-size:11px;line-height:1.5}
.strategy-table{display:grid;gap:1px;overflow:hidden;margin:12px 0;border:1px solid var(--line);border-radius:18px;background:var(--line)}
.strategy-row{display:grid;background:var(--panel-alt)}
.strategy-table.cols-2 .strategy-row{grid-template-columns:minmax(110px,.8fr) minmax(180px,1.8fr)}
.strategy-table.cols-3 .strategy-row{grid-template-columns:minmax(100px,.72fr) minmax(160px,1.35fr) minmax(160px,1.35fr)}
.strategy-table.cols-4 .strategy-row{grid-template-columns:minmax(86px,.65fr) repeat(3,minmax(140px,1fr))}
.strategy-row>*{padding:12px 13px;color:var(--muted);font-size:11.5px;line-height:1.55}
.strategy-row strong,.strategy-row b{color:var(--text)}
.strategy-head{background:var(--accent)}
.strategy-head>*{color:var(--accent-text)}
.stat-strip{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin:14px 0}
.stat-card{min-width:0;padding:15px 13px;border:1px solid var(--line);border-radius:18px;background:var(--panel-alt);text-align:center}
.stat-card span{display:block;color:var(--muted);font-size:10.5px;font-weight:900}
.stat-card b{display:block;margin-top:7px;font-size:25px;line-height:1;letter-spacing:-.055em}
.stat-card small{display:block;margin-top:7px;color:var(--muted);font-size:9.5px;line-height:1.35}
.check-grid,.stack-band-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}
.check-item,.stack-band{padding:15px;border:1px solid var(--line);border-radius:18px;background:var(--panel-alt)}
.check-item b,.stack-band b{display:block;font-size:12.5px;line-height:1.4}
.check-item span,.stack-band span{display:block;margin-top:6px;color:var(--muted);font-size:11px;line-height:1.55}
.content-card .number-list{padding-left:0}
.content-card .strategy-table+ p{margin-top:10px}
@media(max-width:700px){
  .article-toolbar{padding:6px 2px}
  .article-series{display:none}
  .related-grid,.check-grid,.stack-band-grid{grid-template-columns:1fr}
  .stat-strip{grid-template-columns:1fr}
  .strategy-table{overflow-x:auto}
  .strategy-table.cols-2 .strategy-row{min-width:520px}
  .strategy-table.cols-3 .strategy-row{min-width:690px}
  .strategy-table.cols-4 .strategy-row{min-width:820px}
}