:root{
    --ink:#16181D;
    --muted:#686B70;
    --bg:#F1F0EB;
    --paper:#FFFEFA;
    --paper-edge:#E7E1D2;
    --code-bg:#1C2129;
    --code-bg-soft:#232934;
    --code-text:#D7DBE2;
    --code-muted:#7C8493;
    --code-tag:#E58A74;
    --code-attr:#E3B341;
    --code-string:#82B98A;
    --accent:#C84B31;
    --accent-dark:#A23B25;
    --accent-soft:#F4DED7;
    --line:#DCD7C9;
    --line-soft:#E9E5D9;
    --radius:10px;
    --shadow:0 1px 2px rgba(22,24,29,.04), 0 12px 32px -16px rgba(22,24,29,.18);
    --serif:'Source Serif 4', Georgia, 'Times New Roman', serif;
    --sans:'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
    --mono:'JetBrains Mono', 'SFMono-Regular', Menlo, Consolas, monospace;
  }

  *{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  @media (prefers-reduced-motion: reduce){
    html{scroll-behavior:auto;}
    *{animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important;}
  }
  body{
    margin:0;
    background:var(--bg);
    color:var(--ink);
    font-family:var(--sans);
    -webkit-font-smoothing:antialiased;
    text-rendering:optimizeLegibility;
  }
  img{max-width:100%;}
  button{font-family:inherit;}
  :focus-visible{outline:2px solid var(--accent); outline-offset:2px;}

  .page{display:flex; flex-direction:column; min-height:100vh;}

  /* ---------- Topbar ---------- */
  .topbar{padding:18px 28px; border-bottom:1px solid var(--line-soft);}
  .topbar-inner{margin:0 auto; display:flex; align-items:center; justify-content:space-between; gap:16px; flex-wrap:wrap;}
  .brand{display:flex; align-items:center; gap:2px; font-family:var(--serif); font-weight:700; font-size:1.25rem; letter-spacing:-0.01em;}
  .brand-mark{
    display:inline-flex; align-items:center; justify-content:center;
    width:30px; height:30px; border-radius:7px;
    background:var(--accent); color:#fff;
    font-family:var(--mono); font-weight:700; font-size:0.85rem;
  }
  .brand-tld{color:var(--accent); font-weight:600;}
  .badge{
    font-family:var(--mono); font-size:.72rem; color:var(--muted);
    border:1px solid var(--line); border-radius:999px; padding:5px 12px;
    background:var(--paper);
  }
  .badge::before{content:'● '; color:#5E9468;}

  /* ---------- Hero ---------- */
  .hero{padding:64px 24px 40px;}
  .hero-inner{margin:0 auto 36px; text-align:center;}
  .eyebrow{
    font-family:var(--mono); font-size:.78rem; letter-spacing:.14em; text-transform:uppercase;
    color:var(--accent); margin:0 0 14px;
  }
  h1{
    font-family:var(--serif); font-weight:700; font-size:clamp(2rem, 4.4vw, 3.1rem);
    line-height:1.12; letter-spacing:-0.015em; margin:0 0 18px;
  }
  .redline-mark{
    text-decoration: underline wavy var(--accent);
    text-decoration-thickness: 2.5px;
    text-underline-offset: 7px;
  }
  .hero-sub{
    font-size:1.08rem; line-height:1.6; color:var(--muted); margin:0 auto;
  }

  /* ---------- Tool row (card + drop sidebar) ---------- */
  .tool-row{
  margin:0 auto; display:flex; align-items:stretch; gap:16px;
    position:relative;
  }
  .tool-card{
    flex:1; min-width:0; background:var(--paper);
    border:1px solid var(--line); border-radius:14px; box-shadow:var(--shadow);
    overflow:hidden; display:flex; flex-direction:column;
  }
  .tool-toolbar-global{
    display:flex; align-items:center; justify-content:space-between; gap:12px;
    padding:12px 16px; border-bottom:1px solid var(--line-soft); flex-wrap:wrap;
    background:linear-gradient(var(--paper), #FBF9F3);
  }
  .tool-toolbar-left, .tool-toolbar-right{display:flex; align-items:center; gap:8px;}

  .btn{
    border:none; border-radius:7px; padding:8px 14px; font-size:.84rem; font-weight:500;
    cursor:pointer; transition:background .15s ease, color .15s ease, transform .05s ease;
  }
  .btn:active{transform:translateY(1px);}
  .btn-ghost{background:transparent; border:1px solid var(--line); color:var(--ink);}
  .btn-ghost:hover{background:var(--line-soft);}
  .btn-accent{background:var(--accent); color:#fff;}
  .btn-accent:hover{background:var(--accent-dark);}

  .dropdown{position:relative;}
  .dropdown-menu{
    display:none; position:absolute; right:0; top:calc(100% + 6px); z-index:30;
    background:#fff; border:1px solid var(--line); border-radius:9px; box-shadow:var(--shadow);
    min-width:200px; padding:6px;
  }
  .dropdown-menu.open{display:block;}
  .dropdown-menu button{
    display:block; width:100%; text-align:left; background:none; border:none; padding:9px 10px;
    font-size:.84rem; border-radius:6px; cursor:pointer; color:var(--ink);
  }
  .dropdown-menu button:hover{background:var(--line-soft);}

  /* ---------- Drop sidebar ---------- */
  .drop-sidebar{width:188px; flex:none;}
  .drop-sidebar-btn{
    width:100%; height:100%; min-height:120px; border:2px dashed var(--line); border-radius:14px;
    background:var(--paper); display:flex; flex-direction:column; align-items:center; justify-content:center;
    gap:9px; cursor:pointer; color:var(--muted); font-family:var(--sans); padding:18px; text-align:center;
  }
  .drop-sidebar-btn:hover, .drop-sidebar-btn.dragging{border-color:var(--accent); color:var(--ink); background:var(--accent-soft);}
  .drop-sidebar-btn strong{font-family:var(--serif); font-size:1rem; color:var(--ink); line-height:1.3;}
  .drop-sidebar-btn span{font-size:.76rem;}
  .drop-sidebar-btn svg{width:30px; height:30px; color:var(--accent);}

  /* ---------- Panes ---------- */
  .panes{display:grid; grid-template-columns:1fr 34px 1fr;}
  .pane{display:flex; flex-direction:column; min-width:0;}
  .pane-header{
    display:flex; align-items:center; justify-content:space-between; gap:10px;
    padding:8px 14px; flex-wrap:wrap; border-bottom:1px solid var(--line-soft);
    background:#FBF9F3;
  }
  .pane-header-dark{background:var(--code-bg-soft); border-bottom:1px solid #2C3340;}
  .pane-label{
    font-family:var(--mono); font-size:.72rem; letter-spacing:.1em; text-transform:uppercase; color:var(--muted);
  }
  .pane-header-dark .pane-label{color:var(--code-muted);}

  .mini-toolbar{display:flex; align-items:center; gap:4px; flex-wrap:wrap;}
  .mini-divider{width:1px; height:18px; background:var(--line); margin:0 4px;}
  .pane-header-dark .mini-divider{background:#39414F;}

  .mini-select{
    font-size:.78rem; font-family:var(--sans); border:1px solid var(--line); border-radius:6px;
    padding:5px 6px; background:#fff; color:var(--ink);
  }

  .icon-btn-text{
    background:none; border:1px solid var(--line); border-radius:6px; padding:6px 11px;
    font-size:.8rem; color:var(--ink); cursor:pointer;
  }
  .icon-btn-text:hover{background:var(--line-soft);}
  .pane-header-dark .icon-btn-text{border-color:#3A4150; color:var(--code-text);}
  .pane-header-dark .icon-btn-text:hover{background:#2C3340;}

  .pane-body{position:relative; flex:1; display:flex; flex-direction:column; min-height:0;}
  .pane-word .pane-body{padding:10px;}
  .tox-tinymce{border:none !important; border-radius:0 !important;}

  /* ---------- Cleanup option chips ---------- */
  .cleanup-bar{display:flex; flex-wrap:wrap; gap:6px; padding:9px 14px; background:var(--code-bg-soft); border-bottom:1px solid #2C3340;}
  .opt-chip{
    position:relative; width:32px; height:32px; border-radius:7px; display:flex; align-items:center; justify-content:center;
    cursor:pointer; border:1px solid transparent; background:rgba(255,255,255,.03);
  }
  .opt-chip svg{width:17px; height:17px; color:var(--code-muted);}
  .opt-chip[data-included="true"]{background:rgba(200,75,49,.24); border-color:var(--accent);}
  .opt-chip[data-included="true"] svg{color:#F1B7A6;}
  .opt-run{
    position:absolute; bottom:-5px; right:-5px; width:15px; height:15px; border-radius:50%;
    background:var(--accent); color:#fff; border:1.5px solid var(--code-bg-soft); font-size:9px; line-height:1;
    display:flex; align-items:center; justify-content:center; cursor:pointer; padding:0;
  }
  .opt-run:hover{background:var(--accent-dark);}

  /* ---------- Editor utility row ---------- */
  .util-row{display:flex; flex-wrap:wrap; gap:3px 14px; padding:6px 14px; background:var(--code-bg-soft); border-bottom:1px solid #2C3340;}
  .util-link{background:none; border:none; color:var(--code-muted); font-family:var(--mono); font-size:.7rem; cursor:pointer; padding:3px 0;}
  .util-link:hover{color:var(--code-text);}

  /* ---------- CodeMirror theming ---------- */
  #cmHost{flex:1; min-height:0; display:flex; flex-direction:column;}
  #cmHost .CodeMirror{flex:1; height:auto; min-height:300px; background:var(--code-bg); color:var(--code-text); font-family:var(--mono); font-size:.83rem; line-height:1.6;}
  #cmHost .CodeMirror-gutters{background:var(--code-bg); border-right:1px solid #2C3340;}
  #cmHost .CodeMirror-linenumber{color:#4B5566;}
  #cmHost .CodeMirror-cursor{border-left:1.5px solid var(--accent);}
  #cmHost .cm-tag{color:var(--code-tag);}
  #cmHost .cm-attribute{color:var(--code-attr);}
  #cmHost .cm-string{color:var(--code-string);}
  #cmHost .cm-comment{color:#6B7280;}
  #cmHost .cm-bracket{color:var(--code-muted);}
  #cmHost .CodeMirror-activeline-background{background:rgba(255,255,255,.045);}
  #cmHost .CodeMirror-matchingtag{background:rgba(200,75,49,.3);}
  #cmHost .CodeMirror-selected{background:rgba(200,75,49,.22);}

  .seam{display:flex; flex-direction:column; align-items:center; justify-content:center; position:relative; background:linear-gradient(to bottom, #FBF9F3, var(--code-bg-soft));}
  .seam-line{position:absolute; top:0; bottom:0; left:50%; width:0; border-left:1.5px dashed var(--line);}
  .seam-arrow{
    width:22px; height:22px; border-radius:50%; background:var(--accent); color:#fff;
    display:flex; align-items:center; justify-content:center; font-size:.7rem; z-index:2;
  }

  .tool-footer{
    display:flex; align-items:center; justify-content:space-between; gap:10px; flex-wrap:wrap;
    padding:10px 16px; border-top:1px solid var(--line-soft);
    font-family:var(--mono); font-size:.74rem; color:var(--muted);
  }

  .drop-overlay{
    display:none; position:absolute; inset:0; z-index:40; align-items:center; justify-content:center;
    background:rgba(200,75,49,.08); border:2px dashed var(--accent); border-radius:14px;
    font-family:var(--mono); font-size:1rem; color:var(--accent-dark); backdrop-filter:blur(1px);
  }
  .drop-overlay.active{display:flex;}

  @media (max-width:980px){
    .tool-row{flex-direction:column;}
    .drop-sidebar{width:100%;}
    .drop-sidebar-btn{min-height:64px; flex-direction:row;}
  }
  @media (max-width:880px){
    .panes{grid-template-columns:1fr;}
    .seam{flex-direction:row; padding:8px 0;}
    .seam-line{display:none;}
    .word-editor{height:280px;}
    #cmHost .CodeMirror{height:280px;}
  }

  /* ---------- Sections ---------- */
.section {
    margin: 0 auto;
    padding: 0px 20px;
}
  .section h2{
    font-family:var(--serif); font-weight:700; font-size:clamp(1.5rem,2.6vw,2rem);
    letter-spacing:-.01em; margin:0 0 18px;
  }
  .section p{font-size:1.02rem; line-height:1.7; color:var(--muted); margin:0 0 14px;}
  .section{opacity:0; transform:translateY(14px); transition:opacity .5s ease, transform .5s ease;}
  .section.in-view{opacity:1; transform:none;}
  .inline-code{font-family:var(--mono); font-size:.85em; background:var(--line-soft); padding:2px 6px; border-radius:4px;}

  .code-sample{
    background:var(--code-bg); color:var(--code-text); border-radius:10px;
    padding:18px 20px; overflow-x:auto; font-family:var(--mono); font-size:.8rem; line-height:1.6;
    margin-top:18px;
  }
  .code-sample .t{color:var(--code-tag);}
  .code-sample .a{color:var(--code-attr);}
  .code-sample .s{color:var(--code-string);}

  .steps{list-style:none; margin:28px 0 0; padding:0; display:flex; flex-direction:column; gap:26px;}
  .steps li{display:flex; gap:18px; align-items:flex-start;}
  .step-num{
    font-family:var(--mono); font-size:.78rem; color:var(--accent); border:1px solid var(--accent-soft);
    background:var(--accent-soft); border-radius:7px; padding:5px 8px; flex:none; margin-top:2px;
  }
  .steps h3{font-family:var(--serif); font-size:1.12rem; margin:0 0 6px;}
  .steps p{margin:0;}

  /* ---------- How-to list (8 cleanup options) ---------- */
  .howto-list{list-style:none; margin:24px 0 0; padding:0; display:flex; flex-direction:column; gap:0;}
  .howto-list li{
    display:flex; gap:14px; align-items:flex-start; padding:16px 0; border-bottom:1px solid var(--line-soft);
  }
  .howto-icon{
    flex:none; width:34px; height:34px; border-radius:8px; background:var(--code-bg);
    display:flex; align-items:center; justify-content:center;
  }
  .howto-icon svg{width:18px; height:18px; color:var(--code-tag);}
  .howto-text strong{display:block; font-family:var(--serif); font-size:1rem; margin-bottom:4px; color:var(--ink);}
  .howto-text p{margin:0; font-size:.92rem;}
  .howto-text code{font-family:var(--mono); font-size:.82rem; background:var(--line-soft); padding:1px 5px; border-radius:4px;}
  .howto-text .arrow{color:var(--accent); font-weight:600; margin:0 2px;}

  .faq{margin-top:20px; border-top:1px solid var(--line-soft);}
  .faq-item{border-bottom:1px solid var(--line-soft);}
  .faq-q{
    width:100%; text-align:left; background:none; border:none; cursor:pointer;
    padding:18px 2px; display:flex; justify-content:space-between; align-items:center; gap:14px;
    font-family:var(--serif); font-size:1.04rem; color:var(--ink);
  }
  .faq-icon{font-family:var(--mono); color:var(--accent); flex:none; transition:transform .2s ease;}
  .faq-item.open .faq-icon{transform:rotate(45deg);}
  .faq-a{max-height:0; overflow:hidden; transition:max-height .25s ease;}
  .faq-item.open .faq-a{max-height:260px;}
  .faq-a p{padding:0 2px 18px; margin:0;}

  .footer{
    margin-top:auto; border-top:1px solid var(--line-soft); padding:26px 24px;
    text-align:center; font-size:.84rem; color:var(--muted);
  }

  .toast{
    position:fixed; bottom:24px; left:50%; transform:translate(-50%, 12px);
    background:var(--ink); color:#fff; padding:10px 18px; border-radius:8px;
    font-size:.84rem; opacity:0; pointer-events:none; transition:opacity .2s ease, transform .2s ease;
    z-index:100; font-family:var(--sans); text-align:center;
  }
  .toast.show{opacity:1; transform:translate(-50%, 0);}