@font-face {
    font-family:'Be Vietnam Pro';
    src:url('fonts/BeVietnamPro-Regular.woff2') format('woff2');
    font-style:normal;
    font-weight:400;
    font-display:swap;
  }
  @font-face {
    font-family:'Be Vietnam Pro';
    src:url('fonts/BeVietnamPro-Medium.woff2') format('woff2');
    font-style:normal;
    font-weight:500;
    font-display:swap;
  }
  @font-face {
    font-family:'Be Vietnam Pro';
    src:url('fonts/BeVietnamPro-SemiBold.woff2') format('woff2');
    font-style:normal;
    font-weight:600;
    font-display:swap;
  }
  @font-face {
    font-family:'Be Vietnam Pro';
    src:url('fonts/BeVietnamPro-Bold.woff2') format('woff2');
    font-style:normal;
    font-weight:700;
    font-display:swap;
  }
  @font-face {
    font-family:'Be Vietnam Pro';
    src:url('fonts/BeVietnamPro-ExtraBold.woff2') format('woff2');
    font-style:normal;
    font-weight:800;
    font-display:swap;
  }

  :root {
    --bg:#f4f6f8; --panel:#ffffff; --text:#171a1f; --muted:#526071; --line:#d0d5dd;
    --accent:#111827; --accent2:#344054; --danger:#b42318; --success:#067647;
    --shadow:0 12px 28px rgba(16,24,40,.10);
  }
  *{box-sizing:border-box}
  html,body{margin:0;background:var(--bg);color:var(--text);font-family:'Be Vietnam Pro',sans-serif;font-size:14px;line-height:1.55}
  button,input,select{font:inherit}
  button{cursor:pointer}
  .site-header{height:64px;display:flex;align-items:center;justify-content:space-between;gap:24px;padding:0 22px;background:#fff;border-bottom:1px solid #eaecf0;box-shadow:0 2px 10px rgba(16,24,40,.05);position:relative;z-index:100}
  .site-brand{color:#101828;text-decoration:none;font-size:17px;font-weight:800;white-space:nowrap}
  .site-menu{height:100%;display:flex;align-items:center;gap:4px}
  .site-menu a{height:42px;display:flex;align-items:center;padding:0 16px;border-radius:10px;color:#475467;text-decoration:none;font-weight:700}
  .site-menu a:hover{background:#f2f4f7;color:#101828}
  .site-menu a.active{background:#111827;color:#fff}
  .app{min-height:calc(100vh - 64px);display:grid;grid-template-columns:330px 1fr;gap:18px;padding:18px}
  .panel{background:var(--panel);border:1px solid #eaecf0;border-radius:16px;box-shadow:var(--shadow);overflow:hidden}
  .sidebar{padding:18px;display:flex;flex-direction:column;gap:16px;max-height:calc(100vh - 100px);overflow:auto}
  .brand{display:flex;align-items:center;gap:12px}
  .logo{width:42px;height:42px;border-radius:12px;background:#111827;color:#fff;display:grid;place-items:center;font-weight:800}
  h1{font-size:18px;margin:0}.sub{font-size:12px;color:var(--muted);margin-top:3px}
  .section{border-top:1px solid #eaecf0;padding-top:14px}
  .section:first-of-type{border-top:none;padding-top:0}
  .section h2{font-size:13px;margin:0 0 10px;color:#344054}
  .row{display:grid;grid-template-columns:1fr 1fr;gap:10px}
  .field{display:flex;flex-direction:column;gap:6px;margin-bottom:10px}
  .field label{font-size:12px;color:#475467;font-weight:600}
  input[type="number"],select,input[type="text"]{width:100%;height:40px;border:1px solid var(--line);border-radius:10px;background:#fff;padding:0 11px;color:#101828;outline:none}
  input:focus,select:focus{border-color:#526071;box-shadow:0 0 0 3px rgba(102,112,133,.12)}
  .btn{border:1px solid var(--line);border-radius:10px;background:#fff;color:#101828;min-height:40px;padding:9px 12px;font-weight:700;display:inline-flex;align-items:center;justify-content:center;gap:8px}
  .btn:hover{background:#f9fafb}.btn.primary{background:#111827;color:#fff;border-color:#111827}.btn.primary:hover{background:#1f2937}
  .btn.soft{background:#f2f4f7}.btn.danger{color:var(--danger)}
  .btn.full{width:100%}.btn.small{min-height:34px;padding:6px 10px;font-size:12px}
  .btn-icon{width:17px;height:17px;display:block;flex:0 0 auto;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
  .back-link{text-decoration:none;background:#f2f4f7}
  .upload{display:block;width:100%;border:1.5px dashed #98a2b3;border-radius:12px;padding:16px;text-align:center;background:#fcfcfd;position:relative;overflow:hidden}
  .upload.drag{border-color:#111827;background:#f2f4f7}
  .upload input{display:none}.upload strong{display:block;line-height:1.35}.upload p{margin:6px 0 0;font-size:12px;color:var(--muted);line-height:1.4}
  .thumbs{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:10px}
  .thumb{position:relative;aspect-ratio:1;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#f2f4f7;cursor:grab}
  .thumb img{width:100%;height:100%;object-fit:cover;display:block}.thumb.selected{outline:3px solid #111827;outline-offset:1px}
  .thumb .n{position:absolute;right:4px;bottom:4px;background:rgba(0,0,0,.72);color:#fff;border-radius:999px;font-size:10px;padding:2px 6px}
  .thumb-delete{position:absolute;right:4px;top:4px;width:26px;height:26px;padding:0;border:0;border-radius:7px;display:grid;place-items:center;background:rgba(180,35,24,.92);color:#fff;box-shadow:0 1px 4px rgba(0,0,0,.22);font-size:20px;line-height:1;cursor:pointer}
  .thumb-delete:hover{background:#912018}.thumb-delete:focus-visible{outline:2px solid #fff;outline-offset:1px}
  .help{font-size:11px;color:var(--muted);line-height:1.45;margin:7px 0 0}
  .hidden{display:none!important}
  .cell-settings{display:grid;gap:8px}
  .cell-setting{border:1px solid #eaecf0;border-radius:11px;padding:10px;background:#fcfcfd}
  .cell-title{display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:12px;font-weight:700;margin-bottom:8px}
  .cell-size{color:var(--muted);font-weight:400}
  .cell-setting .row{grid-template-columns:1.25fr .75fr .75fr}
  .cell-setting .field{margin-bottom:0}
  .status{font-size:12px;padding:9px 10px;border-radius:9px;background:#f2f4f7;color:#475467}
  .status.ok{background:#ecfdf3;color:var(--success)}.status.warn{background:#fffaeb;color:#b54708}
  .workspace{display:flex;flex-direction:column;min-width:0;min-height:calc(100vh - 100px)}
  .toolbar{padding:12px 14px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:12px;border-bottom:1px solid #eaecf0;background:#fff}
  .toolbar .group{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.toolbar .meta{font-size:12px;color:var(--muted)}
  .toolbar .group:first-child{justify-self:start}
  .toolbar .page-nav{justify-self:center;flex-wrap:nowrap}
  .toolbar .page-nav #applyLayout.hidden{display:inline-flex!important;visibility:hidden;pointer-events:none}
  #applyLayout:not(.hidden){background:#f79009;color:#fff;border-color:#f79009;box-shadow:0 0 0 3px rgba(247,144,9,.18);animation:layoutAttention 1.6s ease-in-out infinite}
  #applyLayout:not(.hidden):hover{background:#dc6803;border-color:#dc6803}
  @keyframes layoutAttention{0%,100%{box-shadow:0 0 0 3px rgba(247,144,9,.15)}50%{box-shadow:0 0 0 6px rgba(247,144,9,.28)}}
  @media(prefers-reduced-motion:reduce){#applyLayout:not(.hidden){animation:none}}
  .toolbar .group:last-child{justify-self:end;min-width:0}
  .toolbar .group:last-child .meta{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:330px}
  #pageLabel{width:74px;text-align:center;font-variant-numeric:tabular-nums;white-space:nowrap}
  .canvas-wrap{flex:1;overflow:auto;padding:26px;display:flex;align-items:flex-start;justify-content:center;background:#e4e7ec;position:relative}
  .sheet-scale{position:relative;flex:0 0 auto}
  .sheet{position:relative;background:#fff;box-shadow:0 18px 50px rgba(16,24,40,.18);overflow:hidden;user-select:none}
  .slot{position:absolute;border:1px dashed #98a2b3;background:#f8fafc;overflow:hidden;touch-action:none}
  .slot.empty::after{content:"Thả ảnh vào đây";position:absolute;inset:0;display:grid;place-items:center;color:#98a2b3;font-size:11px;text-align:center;padding:6px}
  .slot.active{outline:2px solid #111827;outline-offset:-2px}.slot.over{background:#e4e7ec}
  .slot img{position:absolute;left:50%;top:50%;max-width:none;max-height:none;pointer-events:none;transform-origin:center center;-webkit-user-drag:none}
  .slot .tag{position:absolute;left:3px;top:3px;background:rgba(255,255,255,.86);border:1px solid rgba(0,0,0,.08);font-size:9px;padding:2px 4px;border-radius:4px;z-index:3;pointer-events:none}
  .slot .clear{position:absolute;right:3px;top:3px;width:20px;height:20px;border:none;border-radius:6px;background:rgba(0,0,0,.60);color:#fff;z-index:4;display:none;padding:0;line-height:20px;font-size:13px}.slot:hover .clear{display:block}
  .slot.contain{background:#fff}
  .quadrant{position:absolute;border:1px dotted #d0d5dd;background:rgba(248,250,252,.45);pointer-events:none}
  .blank-page{position:absolute;inset:0;display:grid;place-items:center;text-align:center;color:#667085;padding:24px}
  .blank-page strong{display:block;color:#344054;font-size:15px;margin-bottom:5px}
  .free-item{position:absolute;user-select:none;touch-action:none;cursor:move;outline:1px solid transparent}
  .free-item.active{outline:2px solid #1570ef;outline-offset:1px}
  .free-item img{display:block;width:100%;height:100%;pointer-events:none;-webkit-user-drag:none}
  .free-item .free-delete{position:absolute;right:-11px;top:-11px;width:24px;height:24px;border:0;border-radius:50%;display:none;place-items:center;background:#b42318;color:#fff;z-index:4;padding:0;line-height:1}
  .free-item .free-duplicate{position:absolute;left:-11px;top:-11px;width:24px;height:24px;border:0;border-radius:50%;display:none;place-items:center;background:#1570ef;color:#fff;z-index:4;padding:0}
  .free-item .free-duplicate svg{width:13px;height:13px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
  .free-item .free-resize{position:absolute;width:16px;height:16px;border:2px solid #fff;border-radius:50%;display:none;background:#1570ef;z-index:4;padding:0;touch-action:none}
  .free-resize.nw{left:-7px;top:-7px;cursor:nwse-resize}.free-resize.ne{right:-7px;top:-7px;cursor:nesw-resize}
  .free-resize.sw{left:-7px;bottom:-7px;cursor:nesw-resize}.free-resize.se{right:-7px;bottom:-7px;cursor:nwse-resize}
  .free-item.active .free-delete,.free-item.active .free-duplicate,.free-item.active .free-resize{display:grid}
  .free-hint{position:absolute;inset:0;display:grid;place-items:center;text-align:center;color:#667085;padding:28px;pointer-events:none}
  .free-hint strong{display:block;color:#344054;margin-bottom:5px}
  .zoom-indicator{font-variant-numeric:tabular-nums}
  .print-area{display:none}
  .print-sheet{position:relative;overflow:hidden;background:#fff;break-after:page;page-break-after:always}
  .print-sheet:last-child{break-after:auto;page-break-after:auto}
  .mobile-settings-toggle,.mobile-drawer-head,.mobile-backdrop{display:none}
  @media(max-width:950px){
    body{background:#fff}
    .site-header{height:58px;padding:0 8px;gap:8px}
    .site-brand{font-size:14px;padding-left:4px}
    .site-menu{flex:1;justify-content:flex-end;min-width:0}
    .site-menu a{height:40px;padding:0 11px;font-size:12px;white-space:nowrap}
    .app{display:block;height:calc(100dvh - 58px);min-height:0;padding:0;overflow:hidden}
    .panel{border:0;border-radius:0;box-shadow:none}
    .mobile-settings-toggle{display:inline-flex}
    .mobile-backdrop{display:block;position:fixed;inset:0;z-index:70;border:0;padding:0;background:rgba(16,24,40,.48);opacity:0;visibility:hidden;transition:opacity .2s ease,visibility 0s linear .2s}
    .sidebar{display:flex;position:fixed;z-index:80;left:0;top:0;bottom:0;width:min(88vw,380px);max-height:100dvh;padding:0 14px 28px;overflow-y:auto;background:#fff;box-shadow:16px 0 40px rgba(16,24,40,.22);transform:translateX(-105%);transition:transform .22s ease;overscroll-behavior:contain}
    .mobile-drawer-head{display:flex;position:sticky;top:0;z-index:5;align-items:center;justify-content:space-between;margin:0 -14px 12px;padding:10px 14px;background:rgba(255,255,255,.97);border-bottom:1px solid #eaecf0;backdrop-filter:blur(10px)}
    .mobile-drawer-head strong{font-size:15px}
    .app.settings-open .sidebar{transform:translateX(0)}
    .app.settings-open .mobile-backdrop{opacity:1;visibility:visible;transition-delay:0s}
    .workspace{display:flex;height:calc(100dvh - 58px);min-height:0}
    .toolbar{grid-template-columns:1fr auto;padding:8px;gap:8px}
    .toolbar .group:first-child{justify-self:start;flex-wrap:nowrap}
    .toolbar .page-nav{grid-column:1/-1;grid-row:2;width:100%;justify-self:stretch;justify-content:flex-start;overflow-x:auto;overscroll-behavior-x:contain;padding:1px 0 4px;scrollbar-width:thin}
    .toolbar .page-nav{gap:6px}
    .toolbar .page-nav #applyLayout.hidden{display:none!important;visibility:hidden}
    .toolbar .group:last-child{justify-self:end}
    .toolbar .group:last-child .meta{max-width:150px}
    .canvas-wrap{padding:12px;align-items:flex-start}
    .btn{min-height:44px}
    .btn.small{min-height:40px;padding:7px 11px;white-space:nowrap}
    .toolbar .button-label{display:none}
    .toolbar .page-nav .btn,.mobile-settings-toggle,#zoomFit{width:40px;flex:0 0 40px;padding:0}
    input[type="number"],select,input[type="text"]{height:44px}
    .upload{padding:18px 14px}
    .thumbs{grid-template-columns:repeat(4,1fr)}
  }
  @media(max-width:520px){
    .site-brand{display:none}
    .site-menu{justify-content:stretch}
    .site-menu a{flex:1;justify-content:center}
    .brand{padding:2px 0}
    .row{gap:8px}
    .cell-setting .row{grid-template-columns:1fr 1fr}
    .cell-setting .row .field:first-child{grid-column:1/-1}
    .toolbar .group:last-child{display:none}
    .toolbar{grid-template-columns:1fr}
    .toolbar .group:first-child{justify-self:start}
    .toolbar .page-nav{grid-row:2}
  }
  @media print{
    body{background:#fff}
    .site-header{display:none!important}
    .app{display:none!important}
    .print-area{display:block!important;position:static;overflow:visible;background:#fff}
    @page{margin:0}
  }