:root{
    --paper:#F1ECE1; --paper-deep:#E9E1CF; --ink:#23201B; --kraft:#C9AD84; --kraft-dark:#A5875A;
    --stamp:#C1462F; --stamp-dark:#9B3722; --graphite:#6E6A61; --line:#D8D0BE; --ok:#2F7D5C; --radius:2px;
    }
    
    /* Dark Mode */
    @media (prefers-color-scheme: dark) {
      :root.dark-mode,
      body.dark-mode {
        --paper:#1a1815; --paper-deep:#2a2520; --ink:#f5f0e8; --kraft:#8b7355; --kraft-dark:#b8956a;
        --stamp:#ff6b5a; --stamp-dark:#ff8570; --graphite:#b8b0a0; --line:#3a3530; --ok:#4a9d6f;
      }
    }
    
    :root.dark-mode,
    body.dark-mode {
      --paper:#1a1815; --paper-deep:#2a2520; --ink:#f5f0e8; --kraft:#8b7355; --kraft-dark:#b8956a;
      --stamp:#ff6b5a; --stamp-dark:#ff8570; --graphite:#b8b0a0; --line:#3a3530; --ok:#4a9d6f;
    }
    *{box-sizing:border-box;}
    html,body{margin:0;padding:0;}
    body{
    background:var(--paper);
    background-image:radial-gradient(circle at 1px 1px, rgba(35,32,27,0.06) 1px, transparent 0);
    background-size:22px 22px;
    color:var(--ink); font-family:'Inter',system-ui,sans-serif; min-height:100vh; -webkit-font-smoothing:antialiased;
    }
    a{color:inherit;}
    .wrap{max-width:1040px;margin:0 auto;padding:40px 24px 80px;}
    header{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;padding-bottom:28px;border-bottom:2px solid var(--ink);margin-bottom:36px;flex-wrap:wrap;}
    .header-right{display:flex;align-items:center;gap:14px;flex-wrap:wrap;}
    .dark-toggle{background:none;border:1px solid var(--line);color:var(--graphite);width:36px;height:36px;border-radius:var(--radius);cursor:pointer;font-size:16px;display:flex;align-items:center;justify-content:center;transition:background .2s,border-color .2s;}
    .dark-toggle:hover{background:var(--paper-deep);border-color:var(--ink);}
    .brand{display:flex;align-items:baseline;gap:14px;}
    .brand h1{font-family:'Archivo Black',sans-serif;font-size:clamp(34px,6vw,52px);letter-spacing:-0.01em;margin:0;line-height:0.9;}
    .brand .dot{color:var(--stamp);}
    .brand-sub{font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--graphite);letter-spacing:0.06em;text-transform:uppercase;border-left:2px solid var(--line);padding-left:12px;line-height:1.5;}
    .privacy-tag{font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:0.04em;color:var(--ok);background:rgba(47,125,92,0.08);border:1px solid rgba(47,125,92,0.35);padding:6px 10px;border-radius:var(--radius);white-space:nowrap;}
    .privacy-tag::before{content:"● ";}
    .layout{display:grid;grid-template-columns:210px 1fr;gap:32px;align-items:start;}
    @media (max-width:760px){
      .layout{grid-template-columns:1fr;}
      nav.index{max-height:none;overflow:visible;padding-right:0;}
      .wrap{padding:24px 16px 60px;}
      header{gap:12px;padding-bottom:16px;margin-bottom:24px;}
      .brand h1{font-size:clamp(28px,5vw,40px);}
      .brand-sub{font-size:10px;padding-left:8px;}
      .privacy-tag{font-size:10px;}
      .card{padding:20px;}
      .tool-title h2{font-size:18px;}
      .tool-desc{font-size:13px;margin-bottom:16px;}
      .dropzone{padding:24px 16px;}
      .actions{gap:10px;}
      .stamp-btn{padding:11px 20px;font-size:12.5px;}
      .ghost-btn{padding:8px 12px;font-size:11px;}
    }
    
    @media (max-width:480px){
      .wrap{padding:16px 12px 50px;}
      .brand h1{font-size:clamp(24px,4vw,32px);}
      .brand-sub{display:none;}
      .header-right{width:100%;justify-content:flex-start;}
      .layout{gap:16px;}
      .card{padding:16px;}
      .tool-title h2{font-size:16px;}
      .dropzone{padding:20px 12px;margin-bottom:16px;}
      .file-item{padding:8px 10px;font-size:11px;}
      .actions{flex-direction:column;width:100%;}
      .stamp-btn,.ghost-btn{width:100%;justify-content:center;}
      .result{flex-direction:column;gap:10px;}
      .download-link{width:100%;justify-content:center;text-align:center;}
    }
    nav.index{display:flex;flex-direction:column;gap:0;max-height:82vh;overflow-y:auto;padding-right:4px;}
    .cat-label{font-family:'IBM Plex Mono',monospace;font-size:10.5px;letter-spacing:0.1em;text-transform:uppercase;color:var(--kraft-dark);margin:16px 0 6px;font-weight:600;}
    .cat-label:first-child{margin-top:0;}
    .tab{position:relative;display:flex;align-items:center;gap:8px;padding:10px 12px;font-family:'IBM Plex Mono',monospace;font-size:12.5px;border:1px solid var(--line);border-bottom:none;background:var(--paper-deep);color:var(--graphite);cursor:pointer;text-align:left;width:100%;}
    nav.index .group .tab:last-child{border-bottom:1px solid var(--line);} 
    .tab.group-head{background:var(--paper-deep);color:var(--ink);border-color:var(--line);font-weight:600;}
    .tab.group-head .num{color:var(--kraft-dark);}
    .subtabs{display:flex;flex-direction:column;gap:0;margin:0 0 8px 10px;}
    .subtabs .tab{padding-left:20px;font-size:11.8px;border-left:1px solid var(--line);border-right:1px solid var(--line);}
    .subtabs .tab:last-child{border-bottom:1px solid var(--line);} 
    .tab.active{background:var(--paper);color:var(--ink);font-weight:600;border-color:var(--ink);} 
    .tab:hover:not(.active){background:#EFE7D6;}
    .tab .num{color:var(--kraft-dark);font-size:10.5px;min-width:16px;}
    .card{border:1px solid var(--ink);background:var(--paper);position:relative;padding:32px;}
    .card::before{content:"";position:absolute;top:0;left:0;right:0;height:6px;background:repeating-linear-gradient(90deg, var(--kraft) 0 10px, transparent 10px 20px);}
    .panel{display:none;}
    .panel.active{display:block;}
    .tool-title{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px;flex-wrap:wrap;gap:8px;}
    .tool-title h2{font-family:'Archivo Black',sans-serif;font-size:23px;margin:0;letter-spacing:-0.01em;}
    .tool-desc{color:var(--graphite);font-size:14px;margin:0 0 24px;max-width:60ch;line-height:1.55;}
    .dropzone{border:2px dashed var(--kraft-dark);border-radius:var(--radius);padding:34px 20px;text-align:center;position:relative;transition:background .15s,border-color .15s;cursor:pointer;}
    .dropzone:hover,.dropzone.drag{background:rgba(201,173,132,0.14);border-color:var(--stamp);}
    .dropzone input[type=file]{position:absolute;inset:0;opacity:0;cursor:pointer;}
    .stamp-text{display:inline-block;font-family:'IBM Plex Mono',monospace;font-weight:600;font-size:12.5px;letter-spacing:0.1em;text-transform:uppercase;color:var(--stamp);border:2px solid var(--stamp);padding:7px 14px;border-radius:var(--radius);transform:rotate(-2deg);margin-bottom:8px;}
    .dropzone p{margin:6px 0 0;color:var(--graphite);font-size:12.5px;}
    .filelist{list-style:none;margin:22px 0 0;padding:0;display:flex;flex-direction:column;gap:8px;}
    .file-item{display:flex;align-items:center;gap:10px;background:var(--paper-deep);border:1px solid var(--line);border-left:4px solid var(--kraft-dark);padding:9px 12px;border-radius:var(--radius);flex-wrap:wrap;}
    .file-item.dragging{opacity:.4;}
    .file-item .grip{cursor:grab;color:var(--graphite);font-family:'IBM Plex Mono',monospace;font-size:14px;padding:0 2px;user-select:none;}
    .file-item .idx{font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--kraft-dark);min-width:18px;}
    .file-item .fname{flex:1;font-family:'IBM Plex Mono',monospace;font-size:12.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:80px;}
    .file-item .fsize{font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--graphite);white-space:nowrap;}
    .file-item button.move,.file-item button.remove,.file-item .dl{background:none;border:1px solid var(--line);color:var(--graphite);min-width:24px;height:24px;border-radius:var(--radius);font-size:12px;line-height:1;cursor:pointer;padding:0 6px;font-family:'IBM Plex Mono',monospace;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;}
    .file-item button.remove{color:var(--stamp);border-color:rgba(193,70,47,.4);}
    .file-item .dl{color:var(--ok);border-color:rgba(47,125,92,.4);font-weight:600;}
    .file-item button:hover,.file-item .dl:hover{background:var(--paper);}
    button:focus-visible,.dropzone:focus-within,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--stamp);outline-offset:2px;}
    .file-item button:disabled{opacity:.3;cursor:not-allowed;}
    .actions{display:flex;align-items:center;gap:14px;margin-top:24px;flex-wrap:wrap;}
    .stamp-btn{font-family:'Archivo Black',sans-serif;font-size:13.5px;letter-spacing:.03em;color:var(--paper);background:var(--stamp);border:none;padding:13px 24px;border-radius:var(--radius);cursor:pointer;transition:transform .08s,background .15s;}
    .stamp-btn:hover:not(:disabled){background:var(--stamp-dark);}
    .stamp-btn:active:not(:disabled){transform:scale(.97) rotate(-1deg);}
    .stamp-btn:disabled{background:#C9C2B0;color:#F1ECE1;cursor:not-allowed;}
    .ghost-btn{font-family:'IBM Plex Mono',monospace;font-size:12px;font-weight:600;color:var(--ink);background:transparent;border:1px solid var(--ink);padding:9px 14px;border-radius:var(--radius);cursor:pointer;}
    .ghost-btn:hover{background:var(--ink);color:var(--paper);}
    .ghost-btn:disabled{opacity:.35;cursor:not-allowed;border-color:var(--graphite);color:var(--graphite);}
    .ghost-btn.on{background:var(--ink);color:var(--paper);}
    .status{font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--graphite);}
    .status.ok{color:var(--ok);font-weight:600;}
    .status.err{color:var(--stamp);font-weight:600;}
    .result{margin-top:20px;padding:14px 16px;border:1px solid var(--ok);background:rgba(47,125,92,.07);border-radius:var(--radius);display:none;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;}
    .result.show{display:flex;}
    .result .rname{font-family:'IBM Plex Mono',monospace;font-size:12.5px;}
    .result .rsize{color:var(--graphite);font-size:11px;}
    .download-link{font-family:'IBM Plex Mono',monospace;font-size:12px;font-weight:600;color:var(--ok);text-decoration:none;border:1px solid var(--ok);padding:8px 14px;border-radius:var(--radius);white-space:nowrap;}
    .download-link:hover{background:var(--ok);color:var(--paper);}
    footer{margin-top:40px;padding-top:18px;border-top:1px solid var(--line);font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--graphite);display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;}
    
    /* Testimonials */
    .testimonials-section{margin:60px 0;padding:32px;border:1px solid var(--ink);background:var(--paper-deep);border-radius:var(--radius);}
    .testimonials-section h3{font-family:'Archivo Black',sans-serif;font-size:20px;margin:0 0 24px;letter-spacing:-0.01em;}
    .testimonials-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px;}
    .testimonial{background:var(--paper);border:1px solid var(--line);padding:18px;border-radius:var(--radius);display:flex;flex-direction:column;}
    .testimonial-text{font-size:13px;line-height:1.6;margin-bottom:12px;color:var(--ink);flex:1;}
    .testimonial-stars{color:#FDB022;font-size:12px;margin-bottom:8px;}
    .testimonial-author{font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--graphite);font-weight:600;}
    
    /* Before/After comparison */
    .comparison-wrap{display:flex;gap:16px;margin:20px 0;flex-wrap:wrap;}
    .comparison-item{flex:1;min-width:200px;}
    .comparison-label{font-family:'IBM Plex Mono',monospace;font-size:11px;text-transform:uppercase;color:var(--kraft-dark);margin-bottom:8px;font-weight:600;}
    .comparison-image{border:1px solid var(--line);border-radius:var(--radius);max-width:100%;height:auto;display:block;}
    
    /* Compression slider */
    .compression-slider{display:flex;align-items:center;gap:12px;margin:16px 0;}
    .compression-slider input[type=range]{flex:1;height:6px;background:var(--line);border-radius:3px;outline:none;-webkit-appearance:none;appearance:none;}
    .compression-slider input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:18px;height:18px;background:var(--stamp);border-radius:50%;cursor:pointer;}
    .compression-slider input[type=range]::-moz-range-thumb{width:18px;height:18px;background:var(--stamp);border-radius:50%;cursor:pointer;border:none;}
    .compression-value{font-family:'IBM Plex Mono',monospace;font-size:12px;font-weight:600;min-width:50px;text-align:right;}
    .field{display:flex;flex-direction:column;gap:6px;}
    .field label{font-family:'IBM Plex Mono',monospace;font-size:10.5px;letter-spacing:.05em;text-transform:uppercase;color:var(--graphite);}
    select,input[type=text],input[type=number],input[type=password],input[type=range]{font-family:'IBM Plex Mono',monospace;font-size:13px;padding:8px 10px;border:1px solid var(--ink);background:var(--paper);color:var(--ink);border-radius:var(--radius);}
    input[type=text],input[type=number],input[type=password]{min-width:180px;}
    .row{display:flex;align-items:flex-end;gap:14px;flex-wrap:wrap;margin-top:18px;}
    textarea.ta{width:100%;min-height:160px;font-family:'IBM Plex Mono',monospace;font-size:12.5px;padding:12px;border:1px solid var(--ink);background:#fff;color:var(--ink);border-radius:var(--radius);resize:vertical;line-height:1.5;}
    .two-col{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
    @media (max-width:640px){.two-col{grid-template-columns:1fr;}}
    .mode-toggle{display:flex;gap:0;margin-bottom:20px;border:1px solid var(--ink);width:fit-content;}
    .mode-toggle button{font-family:'IBM Plex Mono',monospace;font-size:12px;font-weight:600;padding:9px 16px;border:none;background:var(--paper);color:var(--graphite);cursor:pointer;border-right:1px solid var(--ink);}
    .mode-toggle button:last-child{border-right:none;}
    .mode-toggle button.active{background:var(--ink);color:var(--paper);}
    .checkbox-row{display:flex;gap:16px;flex-wrap:wrap;margin-top:14px;}
    .chk{display:flex;align-items:center;gap:6px;font-family:'IBM Plex Mono',monospace;font-size:12.5px;}
    .stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(110px,1fr));gap:10px;margin-top:20px;}
    .stat-box{border:1px solid var(--line);background:var(--paper-deep);padding:12px;text-align:center;border-radius:var(--radius);}
    .stat-box .n{font-family:'Archivo Black',sans-serif;font-size:22px;}
    .stat-box .l{font-family:'IBM Plex Mono',monospace;font-size:10px;color:var(--graphite);text-transform:uppercase;letter-spacing:.05em;}
    .copy-btn{font-family:'IBM Plex Mono',monospace;font-size:11px;border:1px solid var(--ink);background:var(--paper);padding:6px 10px;cursor:pointer;border-radius:var(--radius);}
    .copy-btn:hover{background:var(--ink);color:var(--paper);}
    .diff-line{font-family:'IBM Plex Mono',monospace;font-size:12px;white-space:pre-wrap;padding:1px 6px;}
    .diff-add{background:rgba(47,125,92,.15);}
    .diff-del{background:rgba(193,70,47,.15);text-decoration:line-through;}
    .thumb-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:14px;margin-top:20px;}
    .thumb{border:1px solid var(--line);background:var(--paper-deep);padding:8px;text-align:center;position:relative;}
    .thumb.dragging{opacity:.4;}
    .thumb canvas{max-width:100%;box-shadow:0 2px 8px rgba(0,0,0,.15);transition:transform .15s;}
    .thumb .lbl{font-family:'IBM Plex Mono',monospace;font-size:10.5px;color:var(--graphite);margin-top:6px;}
    .thumb .ctrl{display:flex;justify-content:center;gap:6px;margin-top:6px;}
    .thumb .ctrl button{width:22px;height:22px;border:1px solid var(--line);background:var(--paper);cursor:pointer;font-size:11px;border-radius:var(--radius);}
    .thumb .ctrl button:hover{background:var(--ink);color:var(--paper);}
    .form-field-row{display:flex;align-items:center;gap:10px;padding:9px 0;border-bottom:1px solid var(--line);flex-wrap:wrap;}
    .form-field-row label{font-family:'IBM Plex Mono',monospace;font-size:12px;min-width:160px;color:var(--ink);}
    .sign-toolbar{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:16px;}
    .page-nav{display:flex;align-items:center;gap:8px;font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--graphite);}
    .page-nav button{background:none;border:1px solid var(--line);width:26px;height:26px;border-radius:var(--radius);cursor:pointer;color:var(--ink);}
    .page-nav button:disabled{opacity:.3;cursor:not-allowed;}
    .sign-stage-wrap{display:none;border:1px solid var(--line);background:var(--paper-deep);padding:16px;text-align:center;overflow:auto;}
    .sign-stage-wrap.show{display:block;}
    .sign-stage{position:relative;display:inline-block;line-height:0;}
    .sign-stage canvas{display:block;box-shadow:0 2px 10px rgba(0,0,0,.15);}
    .sign-hint{font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--graphite);margin:10px 0 0;}
    .sig-overlay{position:absolute;border:2px dashed var(--stamp);cursor:move;background:rgba(255,255,255,.35);touch-action:none;}
    .sig-overlay img{width:100%;height:100%;object-fit:contain;pointer-events:none;display:block;}
    .sig-overlay .handle{position:absolute;right:-7px;bottom:-7px;width:14px;height:14px;background:var(--stamp);border:2px solid var(--paper);border-radius:50%;cursor:nwse-resize;touch-action:none;}
    .sig-overlay .remove-btn{position:absolute;top:-11px;right:-11px;width:20px;height:20px;background:var(--ink);color:var(--paper);border:2px solid var(--paper);border-radius:50%;font-size:11px;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center;}
    .edit-ctrl{margin-top:14px;padding:12px;background:var(--paper-deep);border:1px solid var(--line);border-radius:var(--radius);}
    .edit-textbox textarea:focus{outline:none;}
    .edit-textbox{position:absolute;z-index:5;}
    .popup-menu{position:absolute;background:var(--ink);border-radius:var(--radius);padding:6px;display:flex;gap:6px;box-shadow:0 4px 14px rgba(0,0,0,.3);z-index:20;}
    .popup-menu button{font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--paper);background:transparent;border:1px solid rgba(241,236,225,.4);padding:7px 10px;border-radius:var(--radius);cursor:pointer;white-space:nowrap;}
    .popup-menu button:hover{background:var(--stamp);border-color:var(--stamp);}
    .modal-backdrop{position:fixed;inset:0;background:rgba(35,32,27,.55);display:none;align-items:center;justify-content:center;z-index:100;padding:20px;}
    .modal-backdrop.show{display:flex;}
    .modal-card{background:var(--paper);border:1px solid var(--ink);padding:24px;max-width:420px;width:100%;position:relative;}
    .modal-card::before{content:"";position:absolute;top:0;left:0;right:0;height:6px;background:repeating-linear-gradient(90deg, var(--kraft) 0 10px, transparent 10px 20px);}
    .modal-card h3{font-family:'Archivo Black',sans-serif;font-size:16px;margin:0 0 4px;}
    .modal-card p{font-size:12px;color:var(--graphite);margin:0 0 14px;}
    #sigPadCanvas{width:100%;height:150px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);touch-action:none;cursor:crosshair;}
    .modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:16px;}
    .qr-box{display:flex;align-items:center;gap:20px;flex-wrap:wrap;margin-top:20px;}
    #qrRender{background:#fff;padding:14px;border:1px solid var(--line);display:inline-block;}
    .fav-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(70px,1fr));gap:10px;margin-top:18px;}
    .fav-grid .fi{text-align:center;font-family:'IBM Plex Mono',monospace;font-size:10px;color:var(--graphite);}
    .fav-grid img{border:1px solid var(--line);background:#fff;max-width:100%;}
    progress.wide{width:100%;accent-color:var(--stamp);height:8px;margin-top:16px;}
    .note{font-family:'IBM Plex Mono',monospace;font-size:11.5px;color:var(--graphite);background:rgba(201,173,132,.14);border:1px solid var(--line);padding:10px 12px;border-radius:var(--radius);margin-top:16px;}
    video{max-width:100%;border:1px solid var(--line);}
    
    /* ============ ANIMATIONS ============ */
    @keyframes fadeIn{from{opacity:0;}to{opacity:1;}}
    @keyframes slideDown{from{opacity:0;transform:translateY(-10px);}to{opacity:1;transform:translateY(0);}}
    @keyframes slideUp{from{opacity:0;transform:translateY(10px);}to{opacity:1;transform:translateY(0);}}
    @keyframes pulse{0%,100%{opacity:1;}50%{opacity:.7;}}
    
    .panel{animation:fadeIn .3s ease-out;}
    .result{animation:slideUp .4s ease-out;}
    button:active{transform:scale(.98);}
    
    /* ============ BEFORE/AFTER COMPARISON ============ */
    .comparison-wrap{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:20px 0;align-items:start;}
    .comparison-item{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;}
    .comparison-label{background:var(--kraft);color:var(--ink);padding:8px 12px;font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.5px;}
    .comparison-image{display:block;width:100%;height:auto;max-height:300px;background:var(--paper-deep);}
    
    /* ============ DARK MODE TOGGLE ============ */
    .dark-toggle{background:none;border:none;font-size:20px;cursor:pointer;padding:8px;transition:transform .2s;margin-right:12px;}
    .dark-toggle:hover{transform:rotate(20deg);}
    
    /* ============ MOBILE RESPONSIVE ============ */
    @media (max-width:768px){
      .wrap{padding:24px 16px 60px;}
      header{flex-direction:column;align-items:flex-start;gap:12px;}
      .layout{flex-direction:column;}
      .index{width:100%;order:2;border-right:none;border-bottom:2px solid var(--line);padding-bottom:12px;margin-bottom:20px;}
      .content{order:3;}
      .card{margin-bottom:24px;}
      .comparison-wrap{grid-template-columns:1fr;gap:12px;}
      button{padding:10px 14px;font-size:13px;}
      .field input[type="text"],.field input[type="email"],.field textarea{font-size:16px;}
      canvas{max-width:100%;}
    }
    
    @media (max-width:640px){
      .wrap{padding:16px 12px 50px;}
      h1{font-size:28px;}
      h2{font-size:18px;}
      .brand-sub{font-size:13px;}
      .tab span.num{display:none;}
      .tab{padding:8px 10px;font-size:12px;}
      .group{display:grid;grid-template-columns:1fr 1fr;gap:6px;}
      .sign-toolbar{flex-direction:column;gap:10px;}
      .row{flex-wrap:wrap;}
      .field{min-width:100% !important;}
      .stamp-btn,.ghost-btn{width:100%;padding:12px;}
      input[type="range"]{width:100%;}
      .page-nav{justify-content:space-around;}
    }
    
    @media (prefers-reduced-motion:reduce){*{transition:none !important;}}