/* Ultra-light styles: no frameworks, no build step. */
:root{
  --bg: #0b0f14;
  --card: #121824;
  --text: #e8eef7;
  --muted: #a8b3c7;
  --line: rgba(255,255,255,.08);
  --btn: #2b6cff;
  --btn2: rgba(255,255,255,.12);
  --radius: 14px;
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
  background: var(--bg);
  color: var(--text);
}

.wrap{
  max-width: 860px;
  margin: 0 auto;
  padding: 24px 16px 40px;
}

.hdr h1{
  margin: 0 0 8px;
  font-size: 28px;
  letter-spacing: .2px;
}
.sub{ margin:0; color: var(--muted); }

.card{
  margin-top: 18px;
  padding: 16px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.grid{ display:grid; gap: 12px; }
label{ display:grid; gap:6px; font-size: 14px; }
small{ color: var(--muted); font-size: 12px; }

input, textarea{
  width:100%;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(0,0,0,.25);
  color: var(--text);
  outline: none;
}
textarea{ resize: vertical; }

.row{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.btn{
  padding: 11px 14px;
  border-radius: 12px;
  border: 0;
  cursor:pointer;
  background: var(--btn);
  color: white;
  font-weight: 700;
}

.field{ margin-top: 12px; }
.field-h{ color: var(--muted); font-size: 12px; margin-bottom: 6px; }
.field-b{ display:flex; gap: 10px; align-items: stretch; }
.field-b input{ flex:1; }
.field-b textarea{ flex:1; }

.mini{
  border: 1px solid var(--line);
  background: var(--btn2);
  color: var(--text);
  border-radius: 12px;
  padding: 10px 12px;
  cursor:pointer;
}

.preview{
  margin-top: 10px;
  padding: 12px;
  border-radius: 12px;
  border: 1px dashed var(--line);
  background: rgba(0,0,0,.18);
  overflow:auto;
}

.note{
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.ftr{
  margin-top: 18px;
  color: var(--muted);
  font-size: 12px;
}

code{
  background: rgba(255,255,255,.08);
  padding: 2px 6px;
  border-radius: 8px;
}
@media (max-width: 640px){
  .row{ grid-template-columns: 1fr; }
  .field-b{ flex-direction: column; }
}


.units{
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
}
.units legend{
  padding: 0 6px;
  color: var(--muted);
  font-size: 12px;
}
.chk{
  display:flex;
  align-items:center;
  gap:10px;
  padding: 4px 0;
  font-size: 14px;
}
.chk input{ width:auto; }