:root{
  --bg:#e6e6e6;
  --panel:#f2f2f2;
  --border:#bdbdbd;
  --text:#222;
  --muted:#666;
  --placeholder:#777;
  --focus:#888;

  --radius:10px;
  --radius2:8px;
  --shadow:0 8px 20px rgba(0,0,0,.08);

  --font:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Courier New",monospace;
}

*{box-sizing:border-box}

html,body{
  margin:0;
  padding:0;
  height:100%;
}

body{
  background:var(--bg);
  font-family:var(--font);
  color:var(--text);

  display:flex;
  justify-content:center;
  align-items:center;
  padding:24px;
}

a{color:inherit;text-decoration:none}

/* home arrow */
.nav-home{
  position:fixed;
  top:12px;
  left:10px;
  color:#444;
  opacity:.3;
}
.nav-home:hover{opacity:1;color:#444}

.panel{
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:var(--radius);
  box-shadow:var(--shadow);

  padding:24px;
  width:min(1200px, 95vw);
}

/* ---------- header ---------- */

.title{
  display:flex;
  align-items:center;
  gap:10px;
  margin:0 0 12px 0;
  min-width:0;
}

.title-text{
  font-size:18px;
  font-weight:500;
  white-space:nowrap;
}

.meta{
  flex:1 1 auto;
  min-width:0;

  margin-left:10px;
  color:var(--muted);
  font-size:13px;
  font-weight:400;

  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

.title-btns{
  display:flex;
  gap:6px;
  align-items:center;
  flex:0 0 auto;
}

.icon-btn{
  border:1px solid transparent;
  background:transparent;
  cursor:pointer;
  font:inherit;
  font-weight:600;
  opacity:.7;
  padding:2px 8px;
  border-radius:8px;
  line-height:1.4;
}
.icon-btn:hover{opacity:1}
.icon-btn:focus{
  outline:none;
  border-color:var(--focus);
  background:#fafafa;
}

/* ---------- popovers ---------- */

.hidden{display:none}

.popover{
  position:absolute;
  top:54px;
  right:16px;
  z-index:20;

  background:var(--panel);
  border:1px solid var(--border);
  border-radius:10px;
  padding:10px 12px;
  max-width:520px;

  box-shadow:0 12px 30px rgba(0,0,0,.15);
}

.legend{
  margin:0;
  font-size:12px;
  color:var(--muted);
  display:flex;
  flex-direction:column;
  gap:6px;
}
.legend span{white-space:nowrap}

.refs{
  font-size:13px;
  line-height:1.25;
}
.refs .refs-title{
  font-weight:600;
  margin-bottom:6px;
  color:#555;
}
.refs a{
  display:block;
  color:#223;
  opacity:.9;
}
.refs a:hover{opacity:1;text-decoration:underline}

/* ---------- input ---------- */

.inp{
  width:100%;
  padding:14px 16px;
  font-size:20px;
  border-radius:var(--radius2);
  border:1px solid var(--border);
  background:#fafafa;
  color:var(--text);
  outline:none;
}
.inp::placeholder{color:var(--placeholder)}
.inp:focus{
  border-color:var(--focus);
  background:#fff;
}

/* ---------- controls ---------- */

.bar{
  margin-top:12px;
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  align-items:center;
}

.ctl{
  display:flex;
  align-items:center;
  gap:8px;
  font-size:13px;
  color:var(--muted);
}

select{
  min-width:220px;
  max-width:100%;
  padding:8px 10px;
  font-size:13px;
  border-radius:var(--radius2);
  border:1px solid var(--border);
  background:#fafafa;
  color:var(--text);
  outline:none;
}
select:focus{
  border-color:var(--focus);
  background:#fff;
}

/* ---------- result ---------- */

.result{
  margin-top:16px;
  padding:12px 16px;
  border-radius:var(--radius2);
  border:1px solid var(--border);
  background:#f7f7f7;
  font-size:14px;

  max-height:60vh;
  overflow-y:auto;
  overscroll-behavior:contain;

  display:none;
}

.result.invalid{
  display:block;
  background:#ededed;
  color:#444;
}

.hdr{
  margin:12px 0 6px;
  font-weight:600;
  opacity:.85;
}

.line{
  display:flex;
  gap:14px;
  padding:6px 0;
  border-top:1px solid rgba(0,0,0,.06);
}
.line:first-child{border-top:none}

.k{
  flex:0 0 190px;
  font-family:var(--mono);
  font-size:13px;
  color:#555;
}

.v{
  flex:1 1 auto;
  font-family:var(--mono);
  font-size:13px;
  color:#222;
  word-break:break-word;
}

/* ---------- responsive ---------- */

@media (max-width:900px){
  .panel{padding:18px}
  .k{flex:0 0 150px}
}

@media (max-width:600px){
  body{padding:14px}
  .panel{padding:18px}
  .k{flex:0 0 120px}
  select{min-width:180px}
}