*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,system-ui,-apple-system,"Noto Sans KR",sans-serif;color:#20242a;background:#f7f7f5}header{height:66px;background:#fff;border-bottom:1px solid #ddd;display:flex;align-items:center;gap:24px;padding:0 24px;position:sticky;top:0;z-index:20}header strong{white-space:nowrap}.search{flex:1;max-width:620px}.search input{width:100%;padding:10px 14px;border:1px solid #ccc;border-radius:8px;font-size:15px}header nav{display:flex;gap:6px}header nav a{padding:8px 10px;text-decoration:none;color:#555;border-radius:7px;font-size:14px}header nav a.active{background:#20242a;color:white}#menuBtn{display:none}.layout{display:grid;grid-template-columns:290px minmax(0,1fr);min-height:calc(100vh - 66px)}aside{background:#fff;border-right:1px solid #ddd;padding:22px 14px;position:sticky;top:66px;height:calc(100vh - 66px);overflow:auto}.side-title{font-size:12px;font-weight:800;letter-spacing:.12em;color:#777;padding:0 9px 15px}.part h3{font-size:12px;letter-spacing:.05em;margin:20px 9px 8px}.part h3 span{display:block;font-weight:500;color:#777;margin-top:3px}.chapter{display:grid;grid-template-columns:30px 1fr;gap:4px;padding:7px 9px;text-decoration:none;color:#444;border-radius:6px;font-size:13px}.chapter:hover{background:#f1f1ef}.chapter.current{background:#e9ecef;color:#111;font-weight:650}main{width:min(980px,100%);padding:48px 54px 120px}.chapter-head{border-bottom:2px solid #222;padding-bottom:18px;margin-bottom:14px}.chapter-head>div{font-size:12px;letter-spacing:.12em;font-weight:800;color:#777}.chapter-head h1{font-family:Georgia,"Noto Serif KR",serif;font-size:30px;line-height:1.35;margin:8px 0}.bco-section{padding:30px 0;border-bottom:1px solid #d8d8d4;scroll-margin-top:90px}.section-no{font-weight:800;font-size:16px;margin-bottom:12px}.texts.two-col{display:grid;grid-template-columns:1fr 1fr;gap:36px}.bco-text{font-family:Georgia,"Noto Serif KR",serif;font-size:17px;line-height:1.75}.bco-text.ko{word-break:keep-all}.comment-bar{display:flex;gap:8px;margin-top:18px}.comment-bar button{border:0;background:transparent;padding:6px 0;margin-right:14px;color:#5d6670;cursor:pointer;font-weight:650}.comments{margin-top:10px;background:#fff;border:1px solid #ddd;border-radius:8px;padding:8px 16px}.comment{position:relative;padding:14px 70px 14px 0;border-bottom:1px solid #eee;white-space:pre-wrap}.comment:last-child{border:0}.comment small{display:block;color:#888;margin-top:7px}.delete-comment{position:absolute;right:0;top:14px;border:0;background:none;color:#9a3d3d;cursor:pointer}.no-comments{padding:14px;color:#888}.search-result{background:white;padding:18px 20px;margin:12px 0;border:1px solid #ddd;border-radius:8px}.search-result a{text-decoration:none;color:#222}.search-result p{color:#555}.muted{color:#777}#overlay{display:none}
@media(max-width:800px){header{padding:0 12px;gap:10px;flex-wrap:wrap;height:auto;min-height:62px;padding-top:10px;padding-bottom:10px}header strong{font-size:14px}.search{order:3;flex-basis:100%;max-width:none}header nav a{font-size:12px;padding:6px}#menuBtn{display:block;border:0;background:none;font-size:22px}.layout{display:block}aside{position:fixed;left:-310px;top:0;height:100vh;width:290px;z-index:50;transition:.2s;box-shadow:4px 0 20px #0002}aside.open{left:0}#overlay.show{display:block;position:fixed;inset:0;background:#0006;z-index:40}main{padding:32px 20px 90px}.texts.two-col{grid-template-columns:1fr;gap:22px}.bco-text{font-size:16px}}
.section-link{display:block;margin-left:2.6rem;padding:.28rem .5rem;font-size:.84rem;color:#667085;text-decoration:none;border-left:1px solid #d0d5dd}.section-link:hover{color:#111827;background:#f2f4f7}.site-footer{margin-left:280px;padding:18px 28px;border-top:1px solid #e5e7eb;font-size:.78rem;color:#667085;background:#fff}@media(max-width:800px){.site-footer{margin-left:0}}

/* Collapsible chapter index */
.chapter-toggle{width:100%;border:0;background:transparent;text-align:left;cursor:pointer;font-family:inherit;grid-template-columns:16px 28px 1fr;align-items:start}
.chapter-toggle .chapter-arrow{font-size:9px;line-height:1.8;transition:transform .15s ease;color:#7b8490}
.chapter-toggle.expanded .chapter-arrow{transform:rotate(90deg)}
.chapter-sections[hidden]{display:none!important}
.chapter-sections{padding:3px 0 7px 16px}
.view-chapter{display:block;margin-left:1.6rem;padding:.35rem .5rem;font-size:.78rem;font-weight:650;color:#475467;text-decoration:none}
.view-chapter:hover{color:#111827;background:#f2f4f7}
.chapter-sections .section-link{margin-left:1.6rem}

/* Front matter navigation */
.index-home{color:inherit;text-decoration:none}.index-home:hover{color:#111}
.preface-nav h3{font-size:12px;letter-spacing:.05em;margin:4px 9px 8px}.preface-nav h3 span{display:block;font-weight:500;color:#777;margin-top:3px}
.preface-link{display:block;padding:6px 9px 6px 18px;text-decoration:none;color:#555;border-radius:6px;font-size:13px;line-height:1.35}
.preface-link:hover{background:#f1f1ef;color:#111}.preface-link.current{background:#e9ecef;color:#111;font-weight:650}
.title-page{min-height:65vh;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;font-family:Georgia,"Noto Serif KR",serif}
.title-page h1{font-size:42px;letter-spacing:.04em;margin:14px 0}.title-kicker{font-size:13px;letter-spacing:.16em;color:#666}.title-year{font-size:22px;margin-top:8px}.title-divider{width:90px;border-top:1px solid #bbb;margin:42px 0}
.preface-content{padding:22px 0 40px}.preface-content .bco-text{white-space:normal}


/* Authentication and comment editing */
.logout-link{margin-left:10px;white-space:nowrap;text-decoration:none;font-size:.9rem}
.login-body{min-height:100vh;display:grid;place-items:center;background:#f5f5f2;padding:24px}
.login-card{width:min(420px,100%);background:#fff;border:1px solid #ddd;border-radius:12px;padding:30px;box-shadow:0 8px 30px rgba(0,0,0,.08)}
.login-card h1{margin-top:0}.login-card label{display:block;margin:16px 0;font-weight:600}.login-card input{display:block;width:100%;box-sizing:border-box;margin-top:7px;padding:11px;border:1px solid #bbb;border-radius:6px;font:inherit}.login-card button{padding:10px 18px;font:inherit;cursor:pointer}.login-error{padding:10px;background:#f7e8e8;border-radius:6px}
.comment-actions,.edit-actions{display:flex;gap:8px;margin-top:8px}.edit-comment-text{width:100%;min-height:110px;box-sizing:border-box;padding:9px;font:inherit}

/* Comments: collapsed by default; explicit action controls */
.comments[hidden]{display:none!important}
.comment-actions{position:absolute;right:0;top:12px;display:flex;gap:8px}
.comment-actions button,.edit-actions button{border:0;background:transparent;cursor:pointer;font-weight:650;padding:3px 5px}
.edit-comment{color:#4d6478}
.delete-comment{position:static;color:#9a3d3d}
.edit-comment-text{width:100%;min-height:92px;padding:10px;border:1px solid #bbb;border-radius:6px;font:inherit;line-height:1.5;resize:vertical}
.edit-actions{display:flex;gap:8px;margin-top:7px}

/* Editing state: hide every Edit/Delete action while any comment is being edited. */
.comment-actions[hidden]{display:none!important}

/* Compact Save / Cancel buttons in inline comment editor. */
.edit-actions .save-edit,
.edit-actions .cancel-edit{
  padding:4px 9px!important;
  border-radius:5px!important;
  font-size:13px!important;
  line-height:1.25!important;
}