/* ───────────── 기본 ───────────── */
*{box-sizing:border-box;margin:0;padding:0}
:root{
  --ink:#1f2330;--ink-2:#4a5062;--ink-3:#7a8194;--line:#e6e8ee;--line-2:#d5d8e2;
  --paper:#ffffff;--paper-2:#f6f7fa;--accent:#0f9d8a;--accent-2:#0b7f70;--danger:#d64545;
  --brand:#7c4dff;--radius:14px;--shadow:0 6px 24px rgba(20,25,40,.10);--shadow-2:0 2px 8px rgba(20,25,40,.08);
  --card-w:300px;
  font-family:-apple-system,BlinkMacSystemFont,"Apple SD Gothic Neo","Pretendard","Noto Sans KR","Malgun Gothic",Segoe UI,Roboto,sans-serif;
}
html,body{height:100%}
body{color:var(--ink);background:#f0f2f6;-webkit-font-smoothing:antialiased;line-height:1.45}
button,input,textarea,select{font:inherit;color:inherit}
button{cursor:pointer;background:none;border:0}
a{color:inherit}
img,video{max-width:100%;display:block}
.hidden{display:none!important}
.muted{color:var(--ink-3)}
.small{font-size:12.5px}
.row{display:flex;align-items:center;gap:8px}
.grow{flex:1}
.wrap{flex-wrap:wrap}
.center{text-align:center}
.mt8{margin-top:8px}.mt12{margin-top:12px}.mt16{margin-top:16px}.mt24{margin-top:24px}
.mb8{margin-bottom:8px}.mb12{margin-bottom:12px}

/* ───────────── 테마 배경 ───────────── */
.theme-bg{position:fixed;inset:0;z-index:-1;background:#f0f2f6;transition:background .4s}
.theme-sunset{background:linear-gradient(160deg,#fbe4ea 0%,#f9c9d3 35%,#f6b8c8 55%,#c9d3df 100%)}
.theme-ocean{background:linear-gradient(160deg,#dbeeff 0%,#a9d3f5 45%,#7fb6e6 100%)}
.theme-forest{background:linear-gradient(160deg,#e6f4e6 0%,#bfe3c3 45%,#8cc79a 100%)}
.theme-lavender{background:linear-gradient(160deg,#eee9fb 0%,#d6c9f5 45%,#b7a3ec 100%)}
.theme-peach{background:linear-gradient(160deg,#fff1e6 0%,#ffd7b8 45%,#f7b98d 100%)}
.theme-paper{background:linear-gradient(160deg,#faf7f0 0%,#f1ebdd 100%)}
.theme-night{background:linear-gradient(160deg,#2b2f45 0%,#1b1e2e 100%)}
.theme-night .topbar{background:rgba(30,32,48,.65);color:#fff;border-color:rgba(255,255,255,.08)}
.theme-night .topbar .icon-btn{color:#fff}
.theme-night .board-title h1,.theme-night .board-title .muted{color:#fff}
.theme-night .section-head{background:rgba(255,255,255,.14);color:#fff}
.theme-night .add-post-strip{background:rgba(255,255,255,.14);color:#fff}
.theme-night .section-chips .chip{background:rgba(255,255,255,.14);color:#fff}
.theme-night .empty-col{color:rgba(255,255,255,.55)}

/* ───────────── 상단바 ───────────── */
.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:10px;padding:10px 16px;
  background:rgba(255,255,255,.55);backdrop-filter:saturate(1.4) blur(14px);-webkit-backdrop-filter:saturate(1.4) blur(14px);
  border-bottom:1px solid rgba(255,255,255,.4)}
.topbar .logo{font-weight:800;letter-spacing:-.3px;display:flex;align-items:center;gap:8px;text-decoration:none}
.topbar .logo .mark{width:26px;height:26px;border-radius:8px;background:linear-gradient(135deg,#f5a4b6,#c58af0);display:inline-block}
.icon-btn{width:38px;height:38px;border-radius:12px;display:inline-flex;align-items:center;justify-content:center;font-size:18px;
  background:rgba(255,255,255,.55);color:var(--ink);transition:background .15s}
.icon-btn:hover{background:rgba(255,255,255,.95)}
.avatar{width:32px;height:32px;border-radius:50%;background:var(--brand);color:#fff;font-weight:700;display:inline-flex;align-items:center;justify-content:center;font-size:13px;flex:none}
.avatar.sm{width:26px;height:26px;font-size:11px}
.avatar.admin{background:#0f9d8a}

/* ───────────── 버튼 ───────────── */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:9px 14px;border-radius:11px;font-weight:600;
  background:var(--paper);border:1px solid var(--line-2);color:var(--ink);transition:.15s;white-space:nowrap}
.btn:hover{background:var(--paper-2)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn.primary:hover{background:var(--accent-2)}
.btn.brand{background:var(--brand);border-color:var(--brand);color:#fff}
.btn.danger{color:var(--danger);border-color:#f0c4c4}
.btn.danger:hover{background:#fdf0f0}
.btn.ghost{background:transparent;border-color:transparent}
.btn.ghost:hover{background:rgba(0,0,0,.05)}
.btn.sm{padding:6px 10px;font-size:13px;border-radius:9px}
.btn.block{width:100%}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn.glass{background:rgba(255,255,255,.55);border-color:rgba(255,255,255,.5)}
.btn.glass:hover{background:rgba(255,255,255,.9)}

/* ───────────── 폼 ───────────── */
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}
.field label{font-size:13px;font-weight:600;color:var(--ink-2)}
.input,textarea.input,select.input{width:100%;padding:11px 12px;border:1px solid var(--line-2);border-radius:11px;background:#fff;outline:none;transition:.15s}
.input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(15,157,138,.15)}
textarea.input{resize:vertical;min-height:90px;line-height:1.5}
.help{font-size:12px;color:var(--ink-3)}
.error{color:var(--danger);font-size:13px;margin-top:6px}

/* ───────────── 인증 화면 ───────────── */
.auth-wrap{min-height:100%;display:flex;align-items:center;justify-content:center;padding:24px}
.auth-card{width:100%;max-width:420px;background:rgba(255,255,255,.88);backdrop-filter:blur(10px);border-radius:22px;padding:28px 26px;box-shadow:var(--shadow)}
.auth-card h1{font-size:22px;letter-spacing:-.4px}
.auth-card .sub{color:var(--ink-3);font-size:14px;margin-top:4px}
.tabs{display:flex;background:var(--paper-2);border-radius:12px;padding:4px;margin:18px 0}
.tabs button{flex:1;padding:9px;border-radius:9px;font-weight:600;color:var(--ink-3)}
.tabs button.active{background:#fff;color:var(--ink);box-shadow:var(--shadow-2)}
.join-banner{background:#eefaf7;border:1px solid #bfe9de;color:#0b6b5f;border-radius:12px;padding:10px 12px;font-size:13.5px;margin-bottom:12px}

/* ───────────── 페이지 레이아웃 ───────────── */
.page{max-width:1100px;margin:0 auto;padding:22px 18px 80px}
.page-head{display:flex;align-items:flex-end;justify-content:space-between;gap:12px;margin-bottom:18px;flex-wrap:wrap}
.page-head h1{font-size:26px;letter-spacing:-.5px}
.page-head .crumb{font-size:13px;color:var(--ink-2)}
.crumb a{text-decoration:none;color:var(--ink-2)}
.crumb a:hover{text-decoration:underline}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px}
.card{background:rgba(255,255,255,.9);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow-2);position:relative;transition:transform .12s, box-shadow .12s;text-decoration:none;color:inherit;display:block}
.card.clickable{cursor:pointer}
.card.clickable:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.card h3{font-size:16.5px;letter-spacing:-.2px}
.card .meta{font-size:12.5px;color:var(--ink-3);margin-top:8px;display:flex;gap:10px;flex-wrap:wrap}
.card .swatch{position:absolute;left:0;top:14px;bottom:14px;width:5px;border-radius:0 4px 4px 0}
.badge{display:inline-flex;align-items:center;gap:4px;font-size:11.5px;font-weight:700;padding:3px 8px;border-radius:999px;background:var(--paper-2);color:var(--ink-2)}
.badge.warn{background:#fff3d6;color:#8a5a00}
.badge.off{background:#eee;color:#666}
.badge.ok{background:#e4f7f2;color:#0b6b5f}
.card .kebab{position:absolute;right:8px;top:8px}
.kebab{width:32px;height:32px;border-radius:9px;display:inline-flex;align-items:center;justify-content:center;color:var(--ink-3);font-size:18px}
.kebab:hover{background:rgba(0,0,0,.06);color:var(--ink)}
.empty{padding:40px;text-align:center;color:var(--ink-3);background:rgba(255,255,255,.55);border-radius:var(--radius);border:1px dashed var(--line-2)}
.code-box{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:26px;letter-spacing:6px;font-weight:800;background:var(--paper-2);border-radius:12px;padding:12px 16px;text-align:center}
.qr{width:180px;height:180px;background:#fff;border-radius:12px;padding:8px;margin:0 auto}
.stat-row{display:flex;gap:10px;flex-wrap:wrap}
.stat{background:rgba(255,255,255,.75);border-radius:12px;padding:10px 14px;min-width:110px}
.stat b{display:block;font-size:20px}
.stat span{font-size:12px;color:var(--ink-3)}

/* ───────────── 드롭다운 메뉴 ───────────── */
.menu{position:fixed;z-index:60;background:#fff;border-radius:12px;box-shadow:0 10px 36px rgba(0,0,0,.18);padding:6px;min-width:180px;animation:pop .12s ease-out}
.menu button{display:flex;align-items:center;gap:8px;width:100%;text-align:left;padding:9px 12px;border-radius:8px;font-size:14px}
.menu button:hover{background:var(--paper-2)}
.menu button.danger{color:var(--danger)}
.menu hr{border:0;border-top:1px solid var(--line);margin:4px 0}
@keyframes pop{from{opacity:0;transform:scale(.96)}to{opacity:1;transform:none}}

/* ───────────── 모달 ───────────── */
.modal-back{position:fixed;inset:0;background:rgba(20,22,35,.45);z-index:50;display:flex;align-items:center;justify-content:center;padding:16px;animation:fade .15s}
@keyframes fade{from{opacity:0}to{opacity:1}}
.modal{background:#fff;border-radius:20px;width:100%;max-width:520px;max-height:calc(100vh - 32px);overflow:auto;box-shadow:0 20px 60px rgba(0,0,0,.25);animation:pop .15s ease-out}
.modal.wide{max-width:760px}
.modal-head{display:flex;align-items:center;gap:8px;padding:16px 18px 6px}
.modal-head h2{font-size:18px;letter-spacing:-.3px;flex:1}
.modal-body{padding:10px 18px 18px}
.modal-foot{display:flex;justify-content:flex-end;gap:8px;padding:0 18px 18px}
.close-x{width:34px;height:34px;border-radius:10px;font-size:20px;color:var(--ink-3)}
.close-x:hover{background:var(--paper-2);color:var(--ink)}
@media (max-width:560px){.modal-back{align-items:flex-end;padding:0}.modal{border-radius:20px 20px 0 0;max-height:94vh}}

/* ───────────── 토스트 ───────────── */
#toast-root{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);z-index:100;display:flex;flex-direction:column;gap:8px;align-items:center;pointer-events:none}
.toast{background:#1f2330;color:#fff;padding:10px 16px;border-radius:999px;font-size:14px;box-shadow:var(--shadow);animation:pop .15s}
.toast.err{background:var(--danger)}

/* ───────────── 보드(담벼락) ───────────── */
.board-shell{min-height:100%;display:flex;flex-direction:column}
.board-title{padding:16px 24px 4px}
.board-title h1{font-size:24px;letter-spacing:-.5px}
.board-title .desc{font-size:14px;color:var(--ink-2);margin-top:2px;white-space:pre-wrap}
.section-chips{display:none;gap:6px;overflow-x:auto;padding:8px 16px;scrollbar-width:none}
.section-chips::-webkit-scrollbar{display:none}
.section-chips .chip{flex:none;padding:6px 12px;border-radius:999px;background:rgba(255,255,255,.7);font-size:13px;font-weight:600}
.wall{flex:1;display:flex;gap:16px;overflow-x:auto;padding:12px 24px 110px;align-items:flex-start;scroll-snap-type:x proximity}
.wall::-webkit-scrollbar{height:10px}
.wall::-webkit-scrollbar-thumb{background:rgba(0,0,0,.18);border-radius:10px}
.column{width:var(--card-w);flex:none;display:flex;flex-direction:column;gap:10px;scroll-snap-align:start}
.section-head{background:rgba(255,255,255,.72);backdrop-filter:blur(8px);border-radius:12px;padding:10px 12px;display:flex;align-items:center;gap:6px;position:sticky;top:0;z-index:5}
.section-head h2{font-size:15.5px;letter-spacing:-.2px;flex:1;line-height:1.3}
.section-head .count{font-size:12px;color:var(--ink-3);font-weight:600}
.add-post-strip{background:rgba(255,255,255,.55);border-radius:12px;padding:8px;text-align:center;font-size:20px;color:var(--ink-2);transition:.15s}
.add-post-strip:hover{background:rgba(255,255,255,.95)}
.add-col{width:auto;flex:none}
.add-col .btn{white-space:nowrap}
.empty-col{font-size:13px;color:var(--ink-3);text-align:center;padding:16px 8px}

/* 게시물 카드 */
.post{background:#fff;border-radius:14px;box-shadow:var(--shadow-2);overflow:hidden;position:relative;animation:pop .18s ease-out}
.post.c-yellow{background:#fff8dc}.post.c-pink{background:#ffe6ec}.post.c-blue{background:#e6f0ff}
.post.c-green{background:#e6f7ea}.post.c-purple{background:#efe7ff}.post.c-orange{background:#fff0e0}
.post.pinned{outline:2px solid #f5c542}
.post-head{display:flex;align-items:center;gap:8px;padding:10px 10px 0 12px}
.post-head .who{flex:1;min-width:0}
.post-head .name{font-size:13px;font-weight:700;display:flex;align-items:center;gap:5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.post-head .time{font-size:11.5px;color:var(--ink-3)}
.post-body{padding:8px 12px 6px}
.post-body h3{font-size:16px;letter-spacing:-.2px;line-height:1.35;word-break:break-word}
.post-body .text{font-size:14px;line-height:1.55;white-space:pre-wrap;word-break:break-word;margin-top:4px}
.post-body .text a{color:#0b6fd6;text-decoration:underline}
.post-body .text.clamp{display:-webkit-box;-webkit-line-clamp:9;-webkit-box-orient:vertical;overflow:hidden}
.more-btn{font-size:12.5px;color:var(--ink-2);font-weight:600;margin-top:2px}
.pin-tag{font-size:11px;background:#fff3c4;color:#7a5a00;padding:2px 7px;border-radius:999px;font-weight:700}
.role-tag{font-size:10.5px;background:#e4f7f2;color:#0b6b5f;padding:1px 6px;border-radius:999px;font-weight:700}

/* 첨부 */
.atts{display:flex;flex-direction:column;gap:6px;padding:4px 8px 0}
.att-img{border-radius:10px;overflow:hidden;cursor:zoom-in;background:#eee}
.att-img img{width:100%;max-height:420px;object-fit:cover}
.att-video video{width:100%;border-radius:10px;background:#000;max-height:360px}
.att-audio audio{width:100%}
.att-embed{position:relative;padding-top:56.25%;border-radius:10px;overflow:hidden;background:#000}
.att-embed iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.att-file{display:flex;align-items:center;gap:10px;padding:9px 10px;border-radius:10px;background:rgba(0,0,0,.05);text-decoration:none;font-size:13.5px}
.att-file .ico{width:34px;height:34px;border-radius:9px;background:#fff;display:flex;align-items:center;justify-content:center;font-size:17px;flex:none}
.att-file .fn{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:600}
.att-file .fs{font-size:11.5px;color:var(--ink-3)}
.att-link{display:block;border-radius:10px;overflow:hidden;background:rgba(0,0,0,.04);text-decoration:none;border:1px solid rgba(0,0,0,.06)}
.att-link img{width:100%;max-height:170px;object-fit:cover}
.att-link .lt{padding:8px 10px}
.att-link .lt b{font-size:13.5px;display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.att-link .lt span{font-size:12px;color:var(--ink-3);display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.att-link .lt p{font-size:12.5px;color:var(--ink-2);margin-top:2px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* 반응/댓글 */
.post-foot{display:flex;align-items:center;gap:4px;padding:6px 8px 8px 8px;border-top:1px solid rgba(0,0,0,.05);margin-top:6px}
.react-btn{display:inline-flex;align-items:center;gap:4px;padding:4px 9px;border-radius:999px;font-size:13px;background:rgba(0,0,0,.04);font-weight:600}
.react-btn:hover{background:rgba(0,0,0,.08)}
.react-btn.mine{background:#ffe1e7;color:#c8264c}
.comment-toggle{margin-left:auto;font-size:13px;color:var(--ink-2);display:inline-flex;align-items:center;gap:5px;padding:4px 8px;border-radius:8px}
.comment-toggle:hover{background:rgba(0,0,0,.05)}
.comments{padding:4px 10px 10px;border-top:1px dashed rgba(0,0,0,.08)}
.comment{display:flex;gap:8px;padding:6px 0;font-size:13.5px}
.comment .cb{flex:1;min-width:0}
.comment .cb b{font-size:12.5px;margin-right:6px}
.comment .cb span.t{font-size:11px;color:var(--ink-3)}
.comment .cb p{white-space:pre-wrap;word-break:break-word}
.comment .del{color:var(--ink-3);font-size:12px;padding:2px 6px;border-radius:6px}
.comment .del:hover{background:rgba(0,0,0,.06);color:var(--danger)}
.comment-form{display:flex;gap:6px;margin-top:6px}
.comment-form input{flex:1;padding:8px 10px;border-radius:9px;border:1px solid var(--line-2);background:#fff;font-size:13.5px}
.comment-form input:focus{outline:none;border-color:var(--accent)}

/* 작성 FAB */
.fab{position:fixed;right:22px;bottom:22px;z-index:30;padding:14px 22px;border-radius:999px;background:var(--accent);color:#fff;font-weight:800;font-size:16px;box-shadow:0 10px 30px rgba(15,157,138,.45);display:flex;align-items:center;gap:8px}
.fab:hover{background:var(--accent-2)}
.fab.disabled{background:#999;box-shadow:none}

/* 작성기 */
.composer .tools{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:6px 0 10px}
.composer .tool{border:1px dashed var(--line-2);border-radius:12px;padding:12px 6px;text-align:center;font-size:12.5px;font-weight:600;color:var(--ink-2);background:var(--paper-2);transition:.15s}
.composer .tool:hover{border-color:var(--accent);color:var(--accent);background:#f0fbf8}
.composer .tool .ico{font-size:22px;display:block;margin-bottom:2px}
.att-list{display:flex;flex-direction:column;gap:6px;margin-bottom:10px}
.att-item{display:flex;align-items:center;gap:10px;padding:8px 10px;border:1px solid var(--line);border-radius:10px;background:#fff;font-size:13.5px}
.att-item .thumb{width:44px;height:44px;border-radius:8px;object-fit:cover;background:var(--paper-2);flex:none;display:flex;align-items:center;justify-content:center;font-size:20px}
.att-item .fn{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.att-item .fs{font-size:11.5px;color:var(--ink-3);display:block}
.att-item .rm{color:var(--ink-3);font-size:18px;padding:2px 6px;border-radius:6px}
.att-item .rm:hover{color:var(--danger);background:var(--paper-2)}
.progress{height:4px;background:var(--line);border-radius:4px;overflow:hidden;margin-top:4px}
.progress i{display:block;height:100%;background:var(--accent);transition:width .2s}
.color-row{display:flex;gap:8px;align-items:center}
.color-dot{width:24px;height:24px;border-radius:50%;border:2px solid transparent;cursor:pointer;box-shadow:inset 0 0 0 1px rgba(0,0,0,.08)}
.color-dot.sel{border-color:var(--ink)}
.c-white{background:#fff}.c-yellow{background:#fff8dc}.c-pink{background:#ffe6ec}.c-blue{background:#e6f0ff}.c-green{background:#e6f7ea}.c-purple{background:#efe7ff}.c-orange{background:#fff0e0}
.theme-row{display:flex;gap:8px;flex-wrap:wrap}
.theme-dot{width:34px;height:34px;border-radius:10px;border:2px solid transparent;cursor:pointer;box-shadow:var(--shadow-2)}
.theme-dot.sel{border-color:var(--ink)}
.link-form{display:flex;gap:6px;margin-bottom:10px}
.link-form input{flex:1}

/* 라이트박스 */
.lightbox{position:fixed;inset:0;background:rgba(0,0,0,.9);z-index:80;display:flex;align-items:center;justify-content:center;cursor:zoom-out;animation:fade .15s}
.lightbox img{max-width:96vw;max-height:94vh;object-fit:contain;border-radius:6px}

/* 학생 목록 */
.table{width:100%;border-collapse:collapse;font-size:13.5px}
.table th,.table td{text-align:left;padding:8px 8px;border-bottom:1px solid var(--line)}
.table th{font-size:12px;color:var(--ink-3);font-weight:600}
.table td .btn{padding:4px 8px}

/* 미니 마크다운 */
.md p{margin:0}
.md .md-gap{height:.6em}
.md h3,.md h4,.md h5{margin:.5em 0 .2em;line-height:1.3}
.md h3{font-size:1.08em}.md h4{font-size:1em}.md h5{font-size:.95em;color:var(--ink-2)}
.md ul,.md ol{margin:.15em 0 .15em 1.3em}
.md li{margin:.1em 0}
.text .md h3:first-child,.text .md h4:first-child{margin-top:0}

/* 교재 섹션 */
.textbook-col .section-head{background:linear-gradient(135deg,rgba(255,244,214,.95),rgba(255,255,255,.85));outline:2px solid rgba(240,180,60,.45)}
.textbook-hint{font-size:12px;color:#7a5a00;background:rgba(255,244,214,.85);border-radius:10px;padding:8px 10px;line-height:1.4}
.theme-night .textbook-hint{color:#ffe9a8;background:rgba(255,244,214,.18)}

/* 📖 교재(책) 보기 */
.book{max-width:820px;margin:0 auto;padding:28px 22px 80px}
.book-cover{background:#fff;border-radius:22px;padding:56px 44px 44px;box-shadow:var(--shadow);text-align:center;border-top:10px solid #d9b98a}
.book-cover-label{font-size:13px;letter-spacing:3px;color:var(--ink-3);text-transform:uppercase}
.book-cover h1{font-size:34px;letter-spacing:-.8px;margin:14px 0 6px;line-height:1.25}
.book-term{color:var(--ink-2);font-size:15px}
.book-desc{margin:18px auto 0;max-width:560px;color:var(--ink-2);white-space:pre-wrap;line-height:1.6}
.book-meta{margin-top:26px;font-size:13px;color:var(--ink-3)}
.book-contrib{margin-top:10px;font-size:13.5px;color:var(--ink-2);line-height:1.6}
.book-toc{background:#fff;border-radius:18px;padding:26px 34px;margin-top:18px;box-shadow:var(--shadow-2)}
.book-toc h2{font-size:18px;margin-bottom:10px}
.book-toc ol{margin-left:22px;line-height:1.9}
.book-toc a{text-decoration:none;font-weight:600}
.book-toc a:hover{text-decoration:underline}
.book-chapter{background:#fff;border-radius:18px;padding:34px 40px;margin-top:22px;box-shadow:var(--shadow-2)}
.chapter-no{font-size:12px;letter-spacing:2.5px;color:#b48a4a;font-weight:700}
.book-chapter>h2{font-size:26px;letter-spacing:-.5px;margin:4px 0 8px;line-height:1.3}
.chapter-intro{color:var(--ink-2);font-size:14.5px;padding-bottom:14px;border-bottom:1px solid var(--line);margin-bottom:8px}
.book-entry{padding:22px 0;border-bottom:1px dashed var(--line-2)}
.book-entry:last-child{border-bottom:0}
.book-entry.excluded{opacity:.55}
.book-entry-head h3{font-size:19px;letter-spacing:-.3px;line-height:1.35}
.book-author{display:flex;align-items:center;gap:6px;font-size:13.5px;color:var(--ink-2);margin-top:6px;flex-wrap:wrap}
.book-admin{display:flex;gap:4px;margin-top:8px;flex-wrap:wrap}
.book-body{margin-top:14px;font-size:15.5px;line-height:1.75}
.book-body .md h3{font-size:16.5px;margin:1.1em 0 .35em;padding-left:10px;border-left:3px solid #d9b98a}
.book-body .md h4{font-size:15.5px}
.book-body .md ul,.book-body .md ol{margin:.3em 0 .3em 1.4em}
.book-body .md .md-gap{height:.8em}
.book-atts{display:flex;flex-direction:column;gap:12px;margin-top:14px}
.book-atts figure{margin:0}
.book-atts figure img{max-height:520px;width:auto;max-width:100%;border-radius:10px;box-shadow:var(--shadow-2)}
.book-atts figcaption{font-size:12px;color:var(--ink-3);margin-top:4px}
.book-foot{text-align:center;margin-top:30px}

@media print{
  @page{margin:18mm 16mm}
  body{background:#fff!important}
  .theme-bg,.topbar,.no-print,.fab,#toast-root,#modal-root{display:none!important}
  .book{max-width:none;padding:0}
  .book-cover{box-shadow:none;border:1px solid #ddd;page-break-after:always;min-height:60vh;display:flex;flex-direction:column;justify-content:center}
  .book-toc{box-shadow:none;border:0;padding:0 8px;page-break-after:always}
  .book-chapter{box-shadow:none;border:0;padding:0 8px;margin-top:0;page-break-before:always}
  .book-entry{page-break-inside:avoid}
  .book-entry.excluded{display:none}
  .book-atts figure img{max-height:120mm}
  a{color:inherit;text-decoration:none}
}

/* 반응형 */
@media (max-width:720px){
  .board-title{padding:12px 16px 2px}
  .board-title h1{font-size:20px}
  .section-chips{display:flex}
  .wall{padding:8px 12px 110px;gap:12px;scroll-snap-type:x mandatory}
  .column{width:min(86vw,var(--card-w))}
  .page{padding:16px 14px 80px}
  .page-head h1{font-size:22px}
  .fab{right:16px;bottom:16px;padding:13px 18px}
  .composer .tools{grid-template-columns:repeat(3,1fr)}
  .topbar{padding:8px 10px}
  .topbar .logo span.txt{display:none}
  .book{padding:14px 10px 80px}
  .book-cover{padding:34px 20px 28px}
  .book-cover h1{font-size:26px}
  .book-toc,.book-chapter{padding:20px 18px}
  .book-chapter>h2{font-size:22px}
}