:root{--nav:#2c3e50;--teal:#1abc9c;--teal-d:#16a085;--gut:#eceff1;--ink:#1b2733;--red:#c0392b}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{background:var(--teal);color:var(--ink);font:16px/1.4 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;display:flex;flex-direction:column}
:focus-visible{outline:3px solid var(--nav);outline-offset:2px}
.nav{background:var(--nav);color:#fff;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:0 20px;min-height:64px;flex-wrap:wrap}
.brand{color:#fff;text-decoration:none;font-size:32px;font-weight:300;letter-spacing:-.5px}
.brand b{font-weight:300}
.nav nav{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.nav nav a,.navbtn{color:#fff;background:none;border:0;font:700 15px/1 system-ui,sans-serif;padding:12px 14px;text-decoration:none;cursor:pointer;border-radius:3px}
.nav nav a:hover,.navbtn:hover{background:rgba(255,255,255,.12)}
.nav nav a.on{box-shadow:inset 0 -3px 0 var(--teal)}
.tool{flex:1;min-height:0;display:grid;grid-template-columns:1fr 230px 1fr;gap:16px;padding:16px}
.tool.codes{grid-template-columns:minmax(280px,420px) 1fr}
.tool.shared{grid-template-columns:1fr}
.pane{display:flex;flex-direction:column;min-height:0;min-width:0;background:#fff}
.bar{background:var(--nav);color:#fff;display:flex;align-items:center;gap:6px;padding:0 8px;min-height:44px;flex-wrap:wrap}
.bar .title{font-weight:700;padding:0 6px;overflow-wrap:anywhere}
.sp{flex:1}
.bar button,.btnlink{background:none;color:#fff;border:1px solid rgba(255,255,255,.35);border-radius:3px;font:14px/1 system-ui,sans-serif;padding:8px 10px;cursor:pointer;text-decoration:none}
.bar button:hover,.btnlink:hover{background:rgba(255,255,255,.15)}
.ed{flex:1;min-height:0;display:flex;background:#fff;position:relative}
.gut,.ed textarea{margin:0;font:14px/20px SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace}
.gut{width:54px;flex:none;background:var(--gut);color:#78909c;text-align:right;padding:8px 8px 24px;overflow:hidden;user-select:none}
.ed textarea{flex:1;min-width:0;border:0;resize:none;outline:0;padding:8px 10px;color:var(--ink);background:#fff;white-space:pre;overflow:auto;tab-size:2}
.ed textarea:focus-visible{outline:3px solid var(--teal);outline-offset:-3px}
.status{background:#e4e8ea;color:#455a64;font-size:13px;padding:4px 10px}
.mid{display:flex;flex-direction:column;gap:12px;align-self:start}
.mid button,.mid select{width:100%;height:46px;background:var(--teal);color:#fff;border:2px solid rgba(255,255,255,.9);font:20px system-ui,sans-serif;cursor:pointer;padding:0 10px;border-radius:2px}
.mid select{background:#fff;color:#455a64;font-size:16px}
.mid button:hover{background:#fff;color:var(--teal-d)}
.mid button.alt{background:#fff;color:var(--teal-d)}
.mid button.alt:hover{background:#e8fbf7}
.mid button:disabled{opacity:.6;cursor:wait}
#msg{margin:0;padding:10px 12px;color:#fff;background:var(--nav);font-size:15px;overflow-wrap:anywhere}
#msg:empty{display:none}
#msg.err{background:var(--red)}
#msg.warn{background:#9a6700}
.listbody{flex:1;overflow:auto;min-height:0}
.listbody .empty{padding:16px;color:#455a64}
.item{display:flex;align-items:center;gap:6px;padding:8px 10px;border-bottom:1px solid #dde3e6;flex-wrap:wrap}
.item.on{background:#e8fbf7}
.item .name{flex:1;min-width:120px;text-align:left;background:none;border:0;font:600 15px system-ui,sans-serif;color:var(--ink);cursor:pointer;padding:6px 4px;overflow-wrap:anywhere}
.item .badge{font-size:12px;background:var(--nav);color:#fff;border-radius:3px;padding:2px 6px}
.item .badge.shared{background:var(--teal-d)}
.item button.act{background:#fff;border:1px solid #b0bec5;border-radius:3px;font:13px system-ui,sans-serif;padding:5px 8px;cursor:pointer;color:var(--ink)}
.item button.act:hover{background:#eceff1}
.item button.del{color:var(--red);border-color:#e6b0aa}
.notice{background:#fff;margin:32px auto;padding:24px 28px;max-width:520px}
.notice .btnlink{background:var(--nav)}
#toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);background:var(--nav);color:#fff;padding:10px 16px;border-radius:3px;z-index:20;max-width:90vw}
dialog{border:0;border-radius:4px;padding:0;width:min(420px,92vw)}
dialog::backdrop{background:rgba(44,62,80,.65)}
dialog form{padding:20px;display:flex;flex-direction:column;gap:12px}
dialog label{display:flex;flex-direction:column;gap:4px;font-weight:600;font-size:14px}
dialog input{height:42px;border:1px solid #90a4ae;border-radius:3px;padding:0 10px;font:16px system-ui,sans-serif}
.tabs{display:flex;gap:4px;border-bottom:2px solid #dde3e6}
.tabs button{flex:1;background:none;border:0;padding:10px 4px;font:600 14px system-ui,sans-serif;color:#546e7a;cursor:pointer;border-bottom:3px solid transparent;margin-bottom:-2px}
.tabs button.on{color:var(--nav);border-bottom-color:var(--teal)}
.note{margin:0;font-size:13px;color:#546e7a}
.err{margin:0;font-size:14px;color:var(--red)}
.err:empty{display:none}
.row{display:flex;justify-content:flex-end;gap:8px}
.row button{height:40px;padding:0 16px;border:1px solid #90a4ae;background:#fff;border-radius:3px;font:600 15px system-ui,sans-serif;cursor:pointer}
.row button.primary{background:var(--teal);border-color:var(--teal-d);color:#fff}
[hidden]{display:none!important}
@media (max-width:900px){
  body{height:auto}
  .tool,.tool.codes{grid-template-columns:1fr;gap:12px}
  .pane{height:62vh}
  .mid{display:grid;grid-template-columns:1fr 1fr;align-self:stretch}
  #msg{grid-column:1/-1}
}

/* ---- round 2 additions ---- */
.welcome{color:#fff;font-weight:700;font-size:15px;padding:0 10px}
.stats{background:#e8fbf7;color:#0b5d4f;font-size:14px;font-weight:600;padding:6px 10px;border-bottom:1px solid #bfeee5}
.vres{display:flex;flex-direction:column;gap:8px}
.mid .vbtn{height:46px;font-weight:700;border-color:#fff}
.mid .vbtn.err{background:#c0392b;color:#fff}
.mid .vbtn.ok{background:#1e8449;color:#fff}
.mid .vbtn.err:hover,.mid .vbtn.ok:hover{background:#fff}
.mid .vbtn.err:hover{color:#c0392b}
.mid .vbtn.ok:hover{color:#1e8449}
.vlabel{margin:0;padding:10px 12px;color:#fff;font-size:15px;font-weight:600;overflow-wrap:anywhere;border-left:6px solid #fff}
.vlabel.err{background:#c0392b}
.vlabel.ok{background:#1e8449}
.pane.full{position:fixed;inset:0;z-index:40;height:100%!important}
body.lock{overflow:hidden}
.hashrows{padding:16px;display:flex;flex-direction:column;gap:18px;overflow:auto}
.hashrows label{display:flex;flex-direction:column;gap:6px;font-weight:700;font-size:15px}
.hrow{display:flex;gap:8px}
.hrow input{flex:1;min-width:0;height:42px;border:1px solid #90a4ae;border-radius:3px;padding:0 10px;font:14px SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;color:var(--ink);background:#f7f9fa}
.hrow button{height:42px;padding:0 14px;border:1px solid #90a4ae;background:#fff;border-radius:3px;font:600 14px system-ui,sans-serif;cursor:pointer}
.hrow button:hover{background:#eceff1}
.secure{background:var(--nav);color:#dfe7ec;padding:10px 20px 12px;font-size:13px;border-top:3px solid var(--teal-d)}
.secure strong{color:#fff;font-size:14px}
.secure ul{margin:4px 0 0;padding-left:18px}
.secure li{margin:2px 0}

/* ---- round 3: SEO layout ---- */
html{height:auto;min-height:100%}
body{min-height:100vh;height:auto}
.pagehead{margin:0;padding:12px 20px 0;color:#fff;font-size:20px;font-weight:700;line-height:1.3}
.tool{flex:none;height:max(520px,calc(100vh - 112px))}
.seo{background:#fff;margin:8px 16px 16px;padding:8px 28px 24px;line-height:1.6;color:var(--ink)}
.seo h2{font-size:22px;margin:22px 0 8px;color:var(--nav)}
.seo h3{font-size:17px;margin:16px 0 4px}
.seo p,.seo li{max-width:900px}
.seo a,.card{color:var(--teal-d)}
.seo .related{margin-top:24px;font-weight:600}
.home{padding:16px}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:16px}
.card{background:#fff;padding:18px 20px;text-decoration:none;border-top:5px solid var(--nav)}
.card h2{margin:0 0 6px;font-size:21px;color:var(--nav)}
.card p{margin:0;color:#455a64}
.card:hover{border-top-color:var(--teal-d);background:#f5fffd}
@media (max-width:900px){.tool,.tool.codes{height:auto}.seo{margin:8px 0 12px;padding:8px 16px 20px}}