:root{
  --paper:#FBF6F1; --ink:#33291F; --muted:#8C7B6C; --brand:#C56A40; --brand2:#E08B5A;
  --brand-dark:#A4502B; --cream:#F6EAE0; --line:#EADBCE; --maxw:760px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);
  font-family:"Pretendard","Pretendard Variable","Apple SD Gothic Neo","Malgun Gothic",system-ui,sans-serif;
  line-height:1.85;font-size:17px;-webkit-font-smoothing:antialiased;}
a{color:var(--brand-dark);text-decoration:none;border-bottom:1px solid rgba(164,80,43,.3)}
a:hover{border-bottom-color:var(--brand-dark)}
.topbar{position:sticky;top:0;z-index:50;background:rgba(251,246,241,.9);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);display:flex;align-items:center;gap:12px;padding:10px 18px;}
.topbar .logo{font-weight:800;color:var(--brand-dark);letter-spacing:-.3px}
.topbar a{font-size:14px;color:var(--muted);border:none}
.topbar .spacer{flex:1}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}

/* 표지 */
.cover{background:linear-gradient(160deg,#C56A40,#A4502B 70%);color:#fff;padding:84px 22px 72px;text-align:center;position:relative;overflow:hidden}
.cover::before{content:"";position:absolute;width:520px;height:520px;border-radius:50%;
  background:rgba(255,255,255,.07);top:-180px;right:-160px}
.cover::after{content:"";position:absolute;width:360px;height:360px;border-radius:50%;
  background:rgba(255,255,255,.06);bottom:-160px;left:-120px}
.cover .inner{position:relative;max-width:640px;margin:0 auto}
.cover .kicker{font-size:14px;letter-spacing:3px;opacity:.85;text-transform:uppercase;margin-bottom:18px}
.cover h1{font-size:38px;line-height:1.3;font-weight:800;margin:.2em 0;letter-spacing:-.5px}
.cover .sub{font-size:17px;opacity:.92;margin-top:14px;line-height:1.6}
.cover .author{margin-top:34px;font-size:14px;opacity:.85}
.cover .appicon{width:108px;height:108px;border-radius:24px;margin:0 auto 26px;display:block;
  box-shadow:0 14px 40px rgba(0,0,0,.25);background:#fff}
.cover .appicon-ph{width:108px;height:108px;border-radius:24px;margin:0 auto 26px;
  display:flex;align-items:center;justify-content:center;font-weight:800;font-size:26px;color:#A4502B;background:#FBEFE6;
  box-shadow:0 14px 40px rgba(0,0,0,.25)}

/* 목차 */
.toc{margin:54px auto;padding:30px 28px;background:#fff;border:1px solid var(--line);border-radius:18px;
  box-shadow:0 6px 24px rgba(150,90,50,.06)}
.toc h2{margin:.1em 0 .6em;font-size:22px;color:var(--brand-dark)}
.toc .part{margin-top:18px;font-weight:800;color:var(--ink);border-left:4px solid var(--brand2);padding-left:10px}
.toc ul{list-style:none;padding:0;margin:8px 0 0}
.toc li{padding:5px 0 5px 14px;border-bottom:1px dashed var(--line)}
.toc li.pending{color:var(--muted)}
.toc .tag{font-size:11px;padding:1px 8px;border-radius:20px;margin-left:8px;vertical-align:middle}
.toc .tag.done{background:#EAF3E6;color:#5C8A4E}
.toc .tag.soon{background:#F3ECE4;color:#A98C73}

/* 챕터 */
.chapter{padding:50px 0 10px;border-top:1px solid var(--line)}
.part-divider{margin:30px auto;text-align:center;padding:42px 20px;background:var(--cream);border-radius:18px}
.part-divider .pd-k{font-size:13px;letter-spacing:2px;color:var(--brand-dark);opacity:.8}
.part-divider .pd-t{font-size:26px;font-weight:800;margin-top:8px;color:var(--ink)}
h1.ch-title{font-size:29px;line-height:1.35;font-weight:800;letter-spacing:-.4px;margin:.2em 0 .9em}
.ch-badge{display:inline-block;background:var(--brand);color:#fff;font-size:15px;font-weight:800;
  padding:3px 12px;border-radius:30px;margin-right:12px;vertical-align:middle}
h2{font-size:23px;font-weight:800;margin:1.7em 0 .5em;padding-bottom:.25em;border-bottom:2px solid var(--cream);letter-spacing:-.3px}
h3{font-size:19px;font-weight:700;margin:1.4em 0 .4em;color:var(--brand-dark)}
p{margin:.7em 0}
p.caption{font-size:14px;color:var(--muted);text-align:center;margin-top:-6px}
strong{font-weight:800;color:#1f1813}
em{font-style:normal;background:linear-gradient(transparent 62%,#F4D9C6 62%);padding:0 1px}
hr{border:none;border-top:1px solid var(--line);margin:34px 0}
code{background:#F0E4D8;color:#9a4a22;padding:1px 7px;border-radius:6px;font-size:.9em;
  font-family:"D2Coding","Consolas","Menlo",monospace}

/* 목록 */
ul.bullet,ol{padding-left:4px;margin:.7em 0}
ul.bullet{list-style:none}
ul.bullet li{position:relative;padding-left:22px;margin:.42em 0}
ul.bullet li::before{content:"";position:absolute;left:4px;top:.72em;width:7px;height:7px;border-radius:50%;background:var(--brand2)}
ol{padding-left:24px}
ol li{margin:.42em 0}
ul.todo-list{list-style:none;padding:0;margin:.8em 0;background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden}
ul.todo-list li.todo{display:flex;gap:12px;align-items:flex-start;padding:12px 16px;border-bottom:1px dashed var(--line)}
ul.todo-list li.todo:last-child{border-bottom:none}
.cbox{flex:none;width:20px;height:20px;border-radius:6px;border:2px solid var(--brand2);margin-top:3px;position:relative}
.cbox.on{background:var(--brand);border-color:var(--brand)}
.cbox.on::after{content:"✓";position:absolute;color:#fff;font-size:13px;font-weight:800;left:3px;top:-2px}

/* 콜아웃 */
.callout{margin:1.2em 0;padding:14px 18px 14px 18px;border-radius:12px;border-left:5px solid var(--brand2);
  background:#FBF1E9}
.callout p{margin:.35em 0}
.callout.tip{border-left-color:#E08B5A;background:#FCF2EA}
.callout.warn{border-left-color:#E0A93A;background:#FCF5E2}
.callout.ok{border-left-color:#7BAE6E;background:#EFF6EC}
.callout.note{border-left-color:#9B86C9;background:#F3EFFA}
.callout ul.bullet li::before{background:currentColor;opacity:.5}

/* 표 */
.tbl-wrap{overflow-x:auto;margin:1.2em 0;border-radius:12px;border:1px solid var(--line)}
table{border-collapse:collapse;width:100%;font-size:15px;background:#fff}
thead th{background:var(--brand);color:#fff;font-weight:700;text-align:left;padding:11px 13px;white-space:nowrap}
tbody td{padding:10px 13px;border-top:1px solid var(--line);vertical-align:top}
tbody tr:nth-child(even){background:#FCF6F0}

/* 프롬프트/코드 박스 */
.prompt{margin:1.1em 0;border-radius:12px;overflow:hidden;border:1px solid #3a3128;box-shadow:0 6px 18px rgba(80,50,30,.12)}
.prompt-bar{display:flex;align-items:center;gap:10px;background:#2C2620;padding:8px 12px}
.prompt-tag{color:#E8B58F;font-size:12px;font-weight:700;letter-spacing:.3px}
.prompt-bar .copy-btn{margin-left:auto;background:#C56A40;color:#fff;border:none;border-radius:7px;
  padding:5px 13px;font-size:12px;font-weight:700;cursor:pointer}
.prompt-bar .copy-btn:hover{background:#E08B5A}
.prompt pre{margin:0;background:#221d18;color:#F4ECE3;padding:16px 18px;overflow-x:auto}
.prompt code{background:none;color:#F4ECE3;padding:0;font-size:14px;line-height:1.7;
  font-family:"D2Coding","Consolas","Menlo",monospace;white-space:pre-wrap;word-break:break-word}

/* 이미지 */
.fig{margin:1.3em 0;text-align:center}
.fig img.bookimg{max-width:100%;border-radius:14px;border:1px solid var(--line);box-shadow:0 8px 28px rgba(120,70,40,.12)}
img.bookimg.inline{max-width:100%;border-radius:8px}
.img-ph{display:none;flex-direction:column;align-items:center;justify-content:center;gap:6px;
  padding:38px 20px;border:2px dashed var(--brand2);border-radius:14px;background:#FBF1E9;color:var(--brand-dark);
  font-weight:600}
.img-ph-note{font-size:12px;color:var(--muted);font-weight:400}

/* 자리표시 */
.placeholder{margin:1.1em 0;padding:13px 16px;border-radius:12px;display:flex;flex-direction:column;gap:4px;
  border:1px dashed #C9B7A6;background:#F7F0E8}
.placeholder .ph-label{font-size:11px;font-weight:800;letter-spacing:.5px;text-transform:uppercase;color:var(--brand-dark)}
.placeholder .ph-text{font-size:14px;color:var(--muted)}
.placeholder.ph-check{border-color:#E0A93A;background:#FCF5E2}
.placeholder.ph-check .ph-label{color:#9A6B12}
.placeholder.ph-ref{border-color:#9B86C9;background:#F3EFFA}
.placeholder.ph-ref .ph-label{color:#6A4F9E}

footer{padding:50px 22px 70px;text-align:center;color:var(--muted);font-size:13px;border-top:1px solid var(--line);margin-top:40px}

@page{margin:14mm}
@media print{
  *{-webkit-print-color-adjust:exact !important;print-color-adjust:exact !important}
  .topbar,.copy-btn{display:none}
  .cover{min-height:auto;page-break-after:always}
  .toc{page-break-after:always}
  .chapter{page-break-before:always}
  h1.ch-title,h2,h3{page-break-after:avoid}
  .prompt,.callout,.tbl-wrap,.fig,table,ul.todo-list{page-break-inside:avoid}
  a{color:inherit}
  body{font-size:11pt}
}
@media (max-width:560px){
  body{font-size:16px}
  .cover h1{font-size:30px}
  h1.ch-title{font-size:24px}
}