:root{
  --bg:#ffffff; --ink:#0b1020; --muted:#5a6475; --line:#e7eaf0;
  --card:#ffffff; --shadow:0 10px 30px rgba(16,24,40,.06);
  --accent:#0b6efd; --accent-ink:#fff; --hint:#fff9e6; --hint-border:#ffe8a3;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);
  font:16px/1.6 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial}
a{color:inherit;text-decoration:none}
.container{max-width:1024px;margin:0 auto;padding:20px}
.header{position:sticky;top:0;background:#fff;border-bottom:1px solid var(--line);
  box-shadow:0 4px 12px rgba(16,24,40,.04);z-index:20}
.header .inner{display:flex;align-items:center;gap:16px;justify-content:space-between;padding:14px 20px}
.brand{font-weight:800;letter-spacing:.2px}
.nav{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.nav a{padding:8px 12px;border-radius:10px;border:1px solid var(--line);background:#fafafa}
.top-actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.langbtn{border:1px solid var(--line);background:#f8fafc;padding:8px 12px;border-radius:999px;font-weight:700;cursor:pointer}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:20px;margin:16px 0;box-shadow:var(--shadow)}
.card h2{margin:0 0 12px 0;font-size:1.14rem}
.card h3{margin:8px 0 6px 0}
.small{font-size:.95rem;color:var(--muted)}
.note{background:#f8fafc;border:1px dashed var(--line);border-radius:12px;padding:12px;color:#475569;margin:10px 0}
.example{display:none;margin-top:8px;background:var(--hint);border:1px solid var(--hint-border);border-radius:10px;padding:10px}
label{font-weight:600;display:block;margin:12px 0 6px}
textarea,input[type="text"]{
  width:100%;border:1px solid var(--line);background:#fff;color:var(--ink);
  padding:12px 14px;border-radius:12px;outline:none;transition:border .15s ease, box-shadow .15s ease}
textarea:focus,input[type="text"]:focus{border-color:#cbd5e1;box-shadow:0 0 0 3px rgba(11,110,253,.12)}
textarea{min-height:110px;resize:vertical}
.btn{display:inline-flex;align-items:center;gap:8px;border:none;padding:12px 16px;border-radius:12px;font-weight:700;cursor:pointer}
.btn.primary{background:var(--accent);color:var(--accent-ink)}
.btn.ghost{border:1px solid var(--line);background:#f8fafc}
.hr{height:1px;background:var(--line);margin:16px 0}
.grid2{display:grid;gap:12px}
@media(min-width:860px){.grid2{grid-template-columns:1fr 1fr}}
kbd{background:#eef2f7;border:1px solid var(--line);border-radius:6px;padding:0 6px}

/* Language toggling is limited to .lang elements so examples remain hidden until toggled */
.lang[data-lang="ko"]{display:none}
body.lang-ko .lang[data-lang="en"]{display:none}
body.lang-ko .lang[data-lang="ko"]{display:block}