:root{
  --bg:#e9edf0;
  --panel:#fff;
  --ink:#15191d;
  --muted:#6f7a82;
  --line:#d8dee3;
  --navy:#173849;
  --navy2:#0f2d3c;
  --shadow:0 18px 50px rgba(14,27,35,.16);
}
*{box-sizing:border-box}
html,body{margin:0;min-height:100%;background:var(--bg);color:var(--ink);font-family:Pretendard,"Noto Sans KR","Apple SD Gothic Neo",Arial,sans-serif}
button,input,select{font:inherit}
button{cursor:pointer}
a{color:inherit}
body.kbv-lock-scroll{overflow:hidden}
.kbv-app{height:100dvh;min-height:640px;display:flex;flex-direction:column;overflow:hidden;background:var(--bg);-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}
.kbv-topbar{height:66px;flex:0 0 66px;display:grid;grid-template-columns:minmax(260px,1fr) auto minmax(260px,1fr);align-items:center;gap:12px;padding:0 16px;background:#fff;border-bottom:1px solid var(--line);z-index:40}
.kbv-top-left,.kbv-top-right{display:flex;align-items:center;gap:8px;min-width:0}
.kbv-top-right{justify-content:flex-end}
.kbv-brand{display:flex;align-items:center;gap:10px;text-decoration:none;min-width:0}
.kbv-mark{width:36px;height:36px;border-radius:8px;display:grid;place-items:center;background:var(--navy);color:#fff;font-weight:950}
.kbv-brand span:last-child{display:flex;flex-direction:column;min-width:0}
.kbv-brand small{font-size:9px;letter-spacing:.13em;color:#87939a;font-weight:800}
.kbv-brand strong{font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.kbv-top-center{text-align:center;min-width:150px}
.kbv-top-center strong{display:block;font-size:13px;max-width:360px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.kbv-top-center span{display:block;margin-top:3px;font-size:11px;color:var(--muted);font-weight:700}
.kbv-icon,.kbv-text-btn,.kbv-view-controls button,.kbv-page-controls button,.kbv-jump-row button{
  min-height:38px;border:1px solid var(--line);background:#fff;color:#2a343b;border-radius:9px;font-weight:800
}
.kbv-icon{width:40px;padding:0;font-size:18px}
.kbv-text-btn{display:inline-flex;align-items:center;justify-content:center;padding:0 12px;text-decoration:none;font-size:12px}
.kbv-icon:hover,.kbv-text-btn:hover,.kbv-view-controls button:hover,.kbv-page-controls button:hover{border-color:#aeb9c0;background:#f7f9fa}
.kbv-book-select-wrap{display:flex;align-items:center;gap:5px;height:38px;padding:0 8px;border:1px solid var(--line);border-radius:9px;background:#fff}
.kbv-book-select-wrap span{font-size:9px;color:#8a949a;font-weight:900}
.kbv-book-select-wrap select{max-width:170px;border:0;outline:0;background:transparent;font-size:11px;font-weight:800;color:#334047}
.kbv-shell{position:relative;display:flex;min-height:0;flex:1}
.kbv-main{min-width:0;flex:1;display:flex;flex-direction:column;padding:10px 14px 12px}
.kbv-notice{height:32px;display:flex;align-items:center;justify-content:center;gap:8px;font-size:11px;color:#657079}
.kbv-notice span{padding:3px 7px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:9px;font-weight:900;color:var(--navy)}
.kbv-notice b{color:#34444d}
.kbv-notice em{font-style:normal;color:#8a959b}
.kbv-stage{position:relative;min-height:0;flex:1;display:flex;align-items:stretch;border-radius:14px;background:#dfe4e7;overflow:hidden}
.kbv-viewport{position:relative;min-width:0;min-height:0;flex:1;overflow:auto;overscroll-behavior:contain;padding:18px 52px 22px;display:flex;align-items:flex-start;justify-content:center}
.kbv-pages{display:flex;align-items:flex-start;justify-content:center;gap:16px;min-width:min-content;transform-origin:top center}
.kbv-page{position:relative;flex:0 0 auto;margin:0;background:#fff;box-shadow:var(--shadow);overflow:hidden}
.kbv-page img{display:block;width:100%;height:auto;pointer-events:none;-webkit-user-drag:none;user-select:none}
.kbv-watermarks{position:absolute;inset:0;z-index:3;pointer-events:none;overflow:hidden;display:flex;flex-direction:column;align-items:center;justify-content:space-evenly;opacity:.085}
.kbv-watermarks span{display:block;width:150%;text-align:center;transform:rotate(-27deg);font-size:clamp(13px,1.4vw,22px);font-weight:900;letter-spacing:.12em;color:#173849;white-space:nowrap;text-shadow:0 0 1px rgba(255,255,255,.6)}
.kbv-page-badge{position:absolute;right:9px;bottom:8px;z-index:4;padding:4px 7px;background:rgba(255,255,255,.82);backdrop-filter:blur(3px);border:1px solid rgba(17,37,49,.11);border-radius:999px;color:#536169;font-size:9px;font-weight:800;pointer-events:none}
.kbv-arrow{position:absolute;z-index:10;top:50%;transform:translateY(-50%);width:40px;height:72px;border:0;border-radius:10px;background:rgba(255,255,255,.88);box-shadow:0 6px 20px rgba(0,0,0,.12);font-size:31px;color:#52626a}
.kbv-arrow.prev{left:8px}.kbv-arrow.next{right:8px}
.kbv-arrow:disabled{opacity:.25;cursor:default}
.kbv-controls{display:grid;grid-template-columns:auto minmax(120px,1fr) auto;align-items:center;gap:13px;padding:10px 2px 0}
.kbv-page-controls,.kbv-view-controls{display:flex;align-items:center;gap:5px}
.kbv-page-controls button,.kbv-view-controls button{height:36px;min-height:36px;padding:0 10px;font-size:11px}
.kbv-view-controls button.on{background:var(--navy);border-color:var(--navy);color:#fff}
.kbv-view-controls .sep{width:1px;height:20px;background:#ccd3d8;margin:0 3px}
.kbv-view-controls strong{min-width:45px;text-align:center;font-size:11px;color:#56636a}
.kbv-jump{height:36px;display:flex;align-items:center;gap:5px;padding:0 7px;border:1px solid var(--line);border-radius:9px;background:#fff}
.kbv-jump span{font-size:9px;color:#78858c;font-weight:900}
.kbv-jump input{width:54px;border:0;outline:0;text-align:center;font-weight:900}
.kbv-jump b{font-size:10px;color:#7f8990}
.kbv-range{width:100%;accent-color:var(--navy)}
.kbv-drawer{position:absolute;z-index:55;left:0;top:0;bottom:0;width:min(340px,88vw);background:#fff;border-right:1px solid var(--line);box-shadow:14px 0 40px rgba(10,25,34,.17);transform:translateX(-102%);transition:transform .22s ease;display:flex;flex-direction:column}
.kbv-drawer.open{transform:translateX(0)}
.kbv-scrim{position:absolute;z-index:50;inset:0;border:0;background:rgba(11,22,30,.34);opacity:0;pointer-events:none;transition:.2s}
.kbv-scrim.open{opacity:1;pointer-events:auto}
.kbv-drawer-head{display:flex;align-items:center;justify-content:space-between;padding:16px;border-bottom:1px solid var(--line)}
.kbv-drawer-head small{display:block;font-size:9px;letter-spacing:.12em;color:#8a959b;font-weight:900}
.kbv-drawer-head strong{display:block;margin-top:3px;font-size:15px}
.kbv-drawer-head button{width:36px;height:36px;border:0;background:#f1f3f4;border-radius:9px;font-size:24px}
.kbv-book-switch{display:grid;grid-template-columns:1fr;gap:5px;padding:12px 12px 4px}
.kbv-book-switch a{padding:9px 10px;border:1px solid var(--line);border-radius:8px;text-decoration:none;font-size:11px;font-weight:800;color:#68747b}
.kbv-book-switch a.on{background:var(--navy);border-color:var(--navy);color:#fff}
.kbv-jump-row{display:flex;gap:6px;padding:8px 12px 4px}
.kbv-jump-row label{flex:1;display:flex;align-items:center;gap:7px;height:38px;padding:0 9px;border:1px solid var(--line);border-radius:8px}
.kbv-jump-row span{font-size:9px;color:#859097;font-weight:900}
.kbv-jump-row input{width:100%;border:0;outline:0;font-weight:900}
.kbv-jump-row button{padding:0 12px}
.kbv-search{margin:8px 12px;display:flex;align-items:center;gap:6px;height:38px;padding:0 10px;border:1px solid var(--line);border-radius:8px}
.kbv-search input{min-width:0;flex:1;border:0;outline:0;font-size:12px}
.kbv-thumbs{min-height:0;flex:1;overflow:auto;padding:0 8px 12px}
.kbv-thumb{width:100%;display:grid;grid-template-columns:52px 1fr;gap:10px;align-items:center;padding:7px;border:0;border-radius:8px;background:transparent;text-align:left}
.kbv-thumb:hover{background:#f3f5f6}
.kbv-thumb.on{background:#eaf0f3}
.kbv-thumb-img{display:block;width:52px;aspect-ratio:182/257;background:#e6eaed;border:1px solid #dfe4e7;overflow:hidden}
.kbv-thumb-img img{width:100%;height:100%;object-fit:cover;display:block;pointer-events:none}
.kbv-thumb-copy small{display:block;color:#879198;font-size:9px}
.kbv-thumb-copy strong{display:block;margin-top:2px;font-size:12px;color:#303c43}
.kbv-toast{position:fixed;z-index:100;left:50%;bottom:70px;transform:translate(-50%,14px);padding:9px 13px;border-radius:9px;background:rgba(18,31,39,.92);color:#fff;font-size:11px;font-weight:700;opacity:0;pointer-events:none;transition:.18s}
.kbv-toast.show{opacity:1;transform:translate(-50%,0)}
.kbv-print-block{display:none}
.kbv-app.is-study .kbv-topbar{display:none}
.kbv-app.is-study .kbv-notice{display:none}
.kbv-app.is-study .kbv-main{padding-top:8px}
.kbv-app.is-study .kbv-controls{opacity:.18;transition:.2s}
.kbv-app.is-study .kbv-controls:hover{opacity:1}
@media(max-width:900px){
  .kbv-app{min-height:0}
  .kbv-topbar{height:58px;flex-basis:58px;grid-template-columns:1fr auto}
  .kbv-top-center{display:none}
  .kbv-brand small{display:none}
  .kbv-brand strong{font-size:12px}
  .kbv-top-right .kbv-text-btn,.kbv-book-select-wrap{display:none}
  .kbv-main{padding:6px 6px 8px}
  .kbv-notice{font-size:10px;height:28px}
  .kbv-notice em{display:none}
  .kbv-stage{border-radius:10px}
  .kbv-viewport{padding:10px 11px 16px}
  .kbv-pages{gap:0}
  .kbv-arrow{width:34px;height:60px;background:rgba(255,255,255,.72);font-size:26px}
  .kbv-arrow.prev{left:4px}.kbv-arrow.next{right:4px}
  .kbv-controls{grid-template-columns:1fr;gap:6px;padding-top:7px}
  .kbv-range{grid-row:1}
  .kbv-page-controls{grid-row:2;justify-content:center}
  .kbv-view-controls{grid-row:3;justify-content:center;flex-wrap:wrap}
  #kbvSpreadBtn{display:none}
  .kbv-view-controls .sep{display:none}
  .kbv-page-controls button,.kbv-view-controls button{height:32px;min-height:32px;padding:0 9px}
  .kbv-watermarks span{font-size:13px}
}
@media(max-width:520px){
  .kbv-mark{width:32px;height:32px}
  .kbv-topbar{padding:0 8px}
  .kbv-icon{width:36px;min-height:36px}
  .kbv-viewport{padding-left:6px;padding-right:6px}
  .kbv-arrow{opacity:.55}
  .kbv-jump{height:32px}
  .kbv-page-controls #kbvFirstBtn,.kbv-page-controls #kbvLastBtn{display:none}
  .kbv-notice b{max-width:48vw;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
}
@media print{
  body{background:#fff!important}
  .kbv-app{display:none!important}
  .kbv-print-block{display:block!important;padding:40px;font-family:sans-serif}
}

.kbv-study-exit{display:none;position:fixed;z-index:90;right:14px;top:14px;min-height:38px;padding:0 12px;border:1px solid rgba(255,255,255,.28);border-radius:9px;background:rgba(18,34,44,.86);color:#fff;font-size:11px;font-weight:850;box-shadow:0 7px 24px rgba(0,0,0,.18)}
.kbv-app.is-study .kbv-study-exit{display:block}