:root{--ink:#16181d;--soft:#5b616e;--line:#e3e5ea;--bg:#f6f7f9;--card:#fff;--accent:#2f5bea;--accent-soft:#e9eefe;--warn:#a15c00;--warn-bg:#fff4e0;--err:#c0262d;--err-bg:#fdecec;--ok:#14804a}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--ink)}
body{font:15px/1.6 Pretendard,-apple-system,BlinkMacSystemFont,'Noto Sans KR',sans-serif;word-break:keep-all;overflow-wrap:anywhere}
button,input,select{font:inherit;color:inherit}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
.top{display:flex;align-items:center;justify-content:space-between;padding:18px 0}
.top a{color:var(--ink);text-decoration:none;font-weight:800;letter-spacing:-.02em}
.top a span{color:var(--accent)}
.top .lang{font-weight:500;font-size:13px;color:var(--soft)}
h1{font-size:clamp(28px,4.4vw,40px);line-height:1.2;letter-spacing:-.035em;margin:18px 0 10px}
.lead{margin:0 0 26px;color:var(--soft);font-size:16px}
.lead b{color:var(--ink);font-weight:600}

.drop{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;min-height:220px;border:2px dashed #c4c9d4;border-radius:16px;background:var(--card);cursor:pointer;text-align:center;padding:28px 20px;transition:border-color .15s,background .15s}
.drop:hover,.drop.over{border-color:var(--accent);background:var(--accent-soft)}
.drop:focus-within{outline:3px solid var(--accent);outline-offset:3px}
.drop input{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}
.drop .icon{width:52px;height:52px;border-radius:14px;background:var(--accent);color:#fff;display:grid;place-items:center;font-weight:800;font-size:13px;letter-spacing:.04em}
.drop strong{font-size:18px}
.drop small{color:var(--soft)}
.app.loaded .drop{min-height:0;flex-direction:row;padding:14px 18px;justify-content:flex-start;text-align:left}
.app.loaded .drop .icon{width:40px;height:40px;font-size:11px}
.app.loaded .drop small{display:none}

.msg{margin:14px 0 0;padding:12px 14px;border-radius:10px;font-size:14px}
.msg:empty{display:none}
.msg.info{background:var(--accent-soft);color:#1d3a9c}
.msg.warn{background:var(--warn-bg);color:var(--warn)}
.msg.error{background:var(--err-bg);color:var(--err)}
.msg.ok{background:#e7f6ee;color:var(--ok)}

.pw{margin-top:14px;padding:16px;border-radius:12px;background:var(--card);border:1px solid var(--line)}
.pw form{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}
.pw input{flex:1 1 200px;padding:10px 12px;border:1px solid #c4c9d4;border-radius:8px}

.panel{margin-top:18px;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px}
.fileinfo{display:flex;flex-wrap:wrap;gap:4px 14px;align-items:baseline;margin-bottom:16px;padding-bottom:14px;border-bottom:1px solid var(--line)}
.fileinfo b{font-size:17px;word-break:break-all}
.fileinfo span{color:var(--soft);font-size:14px}
.opts{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:18px 22px}
.opt>label,.opt>.olabel{display:block;font-size:13px;font-weight:700;color:var(--soft);margin-bottom:8px}
.seg{display:inline-flex;border:1px solid #c4c9d4;border-radius:10px;overflow:hidden}
.seg button{border:0;background:#fff;padding:9px 16px;cursor:pointer;min-width:64px}
.seg button+button{border-left:1px solid #c4c9d4}
.seg button[aria-pressed=true]{background:var(--ink);color:#fff}
.opt .hint{display:block;margin-top:6px;font-size:12.5px;color:var(--soft)}
input[type=range]{width:100%;accent-color:var(--accent)}
.range-in{width:100%;padding:9px 12px;border:1px solid #c4c9d4;border-radius:10px}
.range-in[aria-invalid=true]{border-color:var(--err);background:var(--err-bg)}
.selbtns{display:flex;gap:12px;margin-top:6px}
.linkbtn{border:0;background:none;padding:0;color:var(--accent);cursor:pointer;font-size:13px;text-decoration:underline;text-underline-offset:2px}
.actions{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-top:20px;padding-top:18px;border-top:1px solid var(--line)}
.btn{border:0;border-radius:12px;padding:13px 22px;font-weight:700;cursor:pointer;background:var(--accent);color:#fff;font-size:16px}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn.ghost{background:#eef0f4;color:var(--ink);font-weight:600;font-size:14px;padding:10px 16px}
.actions .count{color:var(--soft);font-size:14px}
.prog{margin-top:14px}
.prog[hidden]{display:none}
.bar{height:8px;border-radius:99px;background:#e6e8ee;overflow:hidden}
.bar i{display:block;height:100%;width:0;background:var(--accent);transition:width .2s}
.prog p{margin:6px 0 0;font-size:13px;color:var(--soft)}

.grid{list-style:none;margin:22px 0 0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:16px}
.page{position:relative;background:var(--card);border:2px solid transparent;border-radius:12px;padding:8px;box-shadow:0 1px 3px rgba(20,24,33,.08);transition:border-color .12s}
.page.on{border-color:var(--accent)}
.page .thumb{display:block;width:100%;aspect-ratio:var(--ar,0.707);background:#eceef2;border-radius:6px;overflow:hidden;cursor:pointer}
.page .thumb canvas{display:block;width:100%;height:100%}
.page .row{display:flex;align-items:center;justify-content:space-between;gap:6px;margin-top:8px;font-size:13px}
.page label{display:flex;align-items:center;gap:6px;cursor:pointer}
.page input[type=checkbox]{width:17px;height:17px;accent-color:var(--accent)}
.page .one{border:1px solid #c4c9d4;background:#fff;border-radius:7px;padding:3px 8px;font-size:12px;cursor:pointer}
.page .one:disabled{opacity:.4;cursor:not-allowed}

.note{margin:34px 0 10px;font-size:13px;color:var(--soft)}
@media(max-width:560px){
  .wrap{padding:0 16px}
  .grid{grid-template-columns:repeat(2,1fr);gap:12px}
  .panel{padding:16px}
  .btn{width:100%}
  .actions .count{width:100%;text-align:center}
}
/* ── PDF 합치기·나누기 ── */
[hidden]{display:none!important}
.app.loaded .drop{display:none}
.files{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.fchip{display:inline-flex;align-items:center;gap:8px;max-width:100%;padding:6px 6px 6px 12px;background:var(--card);border:1px solid var(--line);border-radius:99px;font-size:13px}
.fchip i{flex:none;width:10px;height:10px;border-radius:50%}
.fchip span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:260px}
.fchip small{color:var(--soft);white-space:nowrap}
.fchip em{font-style:normal;font-size:11px;color:var(--warn);background:var(--warn-bg);border-radius:99px;padding:1px 7px;white-space:nowrap}
.fchip button{border:0;background:#eef0f4;width:24px;height:24px;border-radius:50%;cursor:pointer;line-height:1;font-size:15px;color:var(--soft)}
.fchip button:hover{background:var(--err-bg);color:var(--err)}
.seg button[aria-pressed=true]{background:var(--ink);color:#fff}
.opt input[type=text],.opt input[type=number]{width:100%;padding:9px 12px;border:1px solid #c4c9d4;border-radius:10px;background:#fff}
.opt input[aria-invalid=true]{border-color:var(--err);background:var(--err-bg)}
.opt .row{display:flex;align-items:center;gap:8px;margin-top:8px}
.opt .row input[type=number]{width:90px}
.chk{display:flex;align-items:center;gap:8px;margin-top:10px;font-size:14px;cursor:pointer}
.chk input{width:17px;height:17px;accent-color:var(--accent)}
.toolbar{position:sticky;top:0;z-index:5;display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-top:18px;padding:10px 0;background:var(--bg)}
.toolbar .sum{font-size:14px;color:var(--soft);margin-right:auto}
.toolbar .sum b{color:var(--ink)}
.tbtn{display:inline-flex;align-items:center;gap:4px;border:1px solid #c4c9d4;background:#fff;border-radius:9px;padding:7px 12px;font-size:13.5px;cursor:pointer;white-space:nowrap}
.tbtn:hover{border-color:var(--ink)}
.tbtn:disabled{opacity:.4;cursor:not-allowed;border-color:#c4c9d4}
.tbtn.primary{background:var(--accent);border-color:var(--accent);color:#fff}
.selbar{display:flex;flex-wrap:wrap;align-items:center;gap:8px;width:100%;padding:8px 10px;background:var(--accent-soft);border-radius:10px;font-size:13.5px}
.selbar b{color:#1d3a9c;margin-right:4px}
.pages{list-style:none;margin:6px 0 0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:18px 16px;position:relative}
.pg{position:relative;background:var(--card);border:2px solid transparent;border-radius:12px;padding:8px;box-shadow:0 1px 3px rgba(20,24,33,.08);cursor:grab;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none;touch-action:manipulation;transition:border-color .12s,opacity .15s}
.pg:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
.pg.sel{border-color:var(--accent);background:#f5f8ff}
.pg.moving{opacity:.3}
.pg .th{display:grid;place-items:center;aspect-ratio:1/1.3;background:#eceef2;border-radius:6px;overflow:hidden}
.pg canvas{display:block;max-width:100%;max-height:100%;box-shadow:0 0 0 1px rgba(0,0,0,.06)}
.pg .ck{position:absolute;left:12px;top:12px;width:24px;height:24px;display:grid;place-items:center;background:rgba(255,255,255,.92);border-radius:6px;box-shadow:0 1px 2px rgba(0,0,0,.15)}
.pg .ck input{width:16px;height:16px;margin:0;accent-color:var(--accent);cursor:pointer}
.pg .acts{position:absolute;right:12px;top:12px;display:flex;gap:4px;opacity:0;transition:opacity .12s}
.pg:hover .acts,.pg:focus-within .acts,.pg.sel .acts{opacity:1}
@media(hover:none){.pg .acts{opacity:1}}
.pg .acts button{width:28px;height:28px;border:0;border-radius:7px;background:rgba(22,24,29,.78);color:#fff;cursor:pointer;font-size:15px;line-height:1;display:grid;place-items:center}
.pg .acts button:hover{background:#000}
.pg .acts .del:hover{background:var(--err)}
.pg .cap{display:flex;align-items:center;gap:8px;margin-top:8px;font-size:12.5px;min-width:0}
.pg .no{flex:none;min-width:24px;font-size:13px;font-variant-numeric:tabular-nums}
.pg .src{display:flex;align-items:center;gap:5px;min-width:0;color:var(--soft)}
.pg .src i{flex:none;width:8px;height:8px;border-radius:50%}
.pg .src span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.pg .rotb{position:absolute;left:50%;bottom:44px;transform:translateX(-50%);font-size:11px;background:rgba(22,24,29,.78);color:#fff;border-radius:99px;padding:2px 8px}
.dropmark{position:absolute;width:4px;border-radius:2px;background:var(--accent);pointer-events:none;z-index:4;box-shadow:0 0 0 3px rgba(47,91,234,.2)}
.dragghost{position:fixed;z-index:60;pointer-events:none;width:110px;padding:6px;background:#fff;border-radius:10px;box-shadow:0 14px 34px rgba(20,24,33,.28);transform:translate(-50%,-60%) rotate(-3deg)}
.dragghost canvas{display:block;width:100%;height:auto;border-radius:4px}
.dragghost b{position:absolute;right:-8px;top:-8px;min-width:24px;height:24px;padding:0 6px;border-radius:12px;background:var(--accent);color:#fff;font-size:12px;display:grid;place-items:center}
.savebar{position:sticky;bottom:0;z-index:6;display:flex;flex-wrap:wrap;align-items:center;gap:10px 16px;margin-top:22px;padding:14px 16px;background:rgba(255,255,255,.96);border:1px solid var(--line);border-radius:14px;box-shadow:0 -6px 24px rgba(20,24,33,.08);backdrop-filter:blur(6px)}
.savebar .info{flex:1 1 220px;font-size:14px;color:var(--soft)}
.savebar .info b{color:var(--ink)}
.savebar .prog{flex:1 1 100%;margin:0}
.veil{position:fixed;inset:0;z-index:80;display:grid;place-items:center;background:rgba(47,91,234,.12);border:4px dashed var(--accent);font-size:20px;font-weight:700;color:#1d3a9c;pointer-events:none}
.notes{margin-top:26px}
.notes .note{margin:0 0 8px}
kbd{font:12px ui-monospace,Menlo,monospace;background:#fff;border:1px solid #c4c9d4;border-bottom-width:2px;border-radius:5px;padding:0 5px}
@media(max-width:560px){
  .pages{grid-template-columns:repeat(2,1fr);gap:12px}
  .savebar{padding:12px}
  .savebar .btn{width:100%}
  .toolbar .sum{width:100%}
  .fchip span{max-width:170px}
}