:root{
  --bg:#0E1B33; --bg2:#0A1428; --panel:#101F3A; --border:#284a7d;
  --text:#EAF0FA; --muted:#8FA0BC; --teal:#35D6C0; --blue:#3B82F6;
  --accent:linear-gradient(90deg,#35D6C0,#3B82F6);
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);
  font-family:"Segoe UI",system-ui,Arial,sans-serif;line-height:1.45}
a{color:var(--teal)}
header{display:flex;align-items:center;gap:14px;padding:18px 24px;border-bottom:1px solid var(--border)}
header .badge{width:44px;height:44px;border-radius:50%;border:2px solid var(--border);
  display:flex;align-items:center;justify-content:center;font-weight:800;background:var(--bg2)}
header h1{font-size:19px;margin:0}
header p{margin:0;color:var(--muted);font-size:13px}
.overline{color:var(--teal);font-weight:700;letter-spacing:2px;font-size:11px;text-transform:uppercase}

main{display:grid;grid-template-columns:320px 1fr;gap:0;min-height:calc(100vh - 82px)}
.controls{padding:22px;border-right:1px solid var(--border);display:flex;flex-direction:column;gap:18px}
.field{display:flex;flex-direction:column;gap:6px}
.field label{font-size:12px;color:var(--muted);font-weight:600}
.field input[type=text],.field select{background:var(--bg2);border:1px solid var(--border);
  color:var(--text);border-radius:8px;padding:9px 10px;font-size:14px;font-family:inherit}
.colorrow{display:flex;gap:8px;align-items:center}
.colorrow input[type=color]{width:44px;height:40px;border:1px solid var(--border);border-radius:8px;background:none;padding:2px;cursor:pointer}
.colorrow input[type=text]{flex:1;text-transform:uppercase}
input[type=range]{width:100%;accent-color:var(--teal)}

.actions{display:flex;flex-wrap:wrap;gap:8px}
.ghost{background:var(--bg2);color:var(--text);border:1px solid var(--border);border-radius:8px;
  padding:8px 11px;font-size:12px;font-weight:700;cursor:pointer;display:inline-flex;align-items:center;gap:5px}
.ghost:hover{border-color:var(--teal)}
.filebtn{user-select:none}
.tip{color:var(--muted);font-weight:400;font-size:11px}
.note{font-size:11px;color:var(--muted);margin-top:4px}

.swatches{display:flex;flex-wrap:wrap;gap:8px}
.sw{position:relative;display:flex;align-items:center;gap:6px;font-size:11px;color:var(--muted);cursor:pointer}
.sw .chip{width:20px;height:20px;border-radius:5px;border:1px solid rgba(255,255,255,.15)}
.sw code{font-size:10px}
.sw input[type=color]{position:absolute;inset:0;width:100%;height:100%;opacity:0;cursor:pointer;border:none;padding:0}

.contrast{display:flex;flex-direction:column;gap:6px}
.crow{display:flex;justify-content:space-between;font-size:12px;padding:6px 9px;border-radius:7px;background:var(--bg2);border-left:3px solid var(--teal)}
.crow.fail{border-left-color:#F87171}
.crow b{font-weight:700}
.crow.ok b{color:var(--teal)} .crow.fail b{color:#F87171}

.stage{padding:22px;display:flex;flex-direction:column;gap:18px;min-width:0}
.preview{background:#0b1424;border:1px solid var(--border);border-radius:14px;padding:14px;overflow:hidden}
.output{background:var(--panel);border:1px solid var(--border);border-radius:14px;display:flex;flex-direction:column}
.output .bar{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid var(--border)}
.output .bar h3{margin:0;font-size:14px}
.btns{display:flex;gap:8px}
button{border:none;border-radius:8px;padding:9px 14px;font-weight:700;font-size:13px;cursor:pointer;font-family:inherit}
#copyBtn{background:var(--bg2);color:var(--text);border:1px solid var(--border)}
#downloadBtn{background:var(--accent);color:#06263f}
pre{margin:0;max-height:320px;overflow:auto;padding:14px 16px;font-size:12px;
  font-family:Consolas,"Courier New",monospace;color:#DCE6F5}
.hint{font-size:12px;color:var(--muted);padding:10px 16px;border-top:1px solid var(--border)}
footer{padding:16px 24px;color:var(--muted);font-size:12px;border-top:1px solid var(--border)}
@media(max-width:860px){main{grid-template-columns:1fr}.controls{border-right:none;border-bottom:1px solid var(--border)}}