:root{
  --bg:#0d1210;
  --panel:#141c18;
  --panel-2:#101713;
  --line:#2a3931;
  --text:#eef7f1;
  --muted:#8da097;
  --green:#28d768;
  --green-2:#1eb957;
  --green-soft:#133f27;
  --danger:#ff6b6b;
  --shadow:0 18px 50px rgba(0,0,0,.28);
  --radius:16px;
}
*{box-sizing:border-box}
html{color-scheme:dark}
body{
  margin:0;
  min-height:100vh;
  background:
    radial-gradient(circle at 20% 0%, rgba(40,215,104,.07), transparent 28%),
    radial-gradient(circle at 90% 10%, rgba(40,215,104,.045), transparent 24%),
    var(--bg);
  color:var(--text);
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
}
button,input,textarea,select{font:inherit}
button{cursor:pointer}
.app-shell{width:min(1180px,calc(100% - 32px));margin:0 auto;padding:34px 0 28px}
.topbar{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:24px}
.eyebrow{font-size:.72rem;letter-spacing:.16em;color:var(--muted);text-transform:uppercase;margin-bottom:8px}
h1{margin:0;font-size:clamp(2rem,4vw,3.7rem);line-height:.95;letter-spacing:-.06em}
h1 span{color:var(--green)}
.subtitle{max-width:720px;color:var(--muted);margin:14px 0 0;line-height:1.5}
.grid{display:grid;grid-template-columns:minmax(300px,420px) minmax(0,1fr);gap:18px}
.panel{background:linear-gradient(180deg,rgba(20,28,24,.96),rgba(15,22,18,.96));border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.controls-panel{padding:20px}
.output-panel{padding:22px;min-height:620px}
.section-title{font-size:.78rem;text-transform:uppercase;letter-spacing:.12em;color:#b8c6bf;font-weight:700}
.mode-tabs{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:12px 0}
.mode-tab,.ghost-btn,.secondary-btn{border:1px solid var(--line);background:#111914;color:var(--text);border-radius:10px;padding:10px 12px;transition:.18s ease}
.mode-tab:hover,.ghost-btn:hover,.secondary-btn:hover{border-color:#456052;transform:translateY(-1px)}
.mode-tab.active{border-color:var(--green);background:var(--green-soft);color:#dffff0;box-shadow:inset 0 0 0 1px rgba(40,215,104,.14)}
.mode-help,.microcopy{font-size:.85rem;color:var(--muted);line-height:1.45}
.mode-help{min-height:42px;margin-bottom:16px}
.field-label{display:block;font-size:.78rem;color:#b9c6c0;margin:14px 0 7px}
textarea,input,select{
  width:100%;border:1px solid var(--line);background:#0c130f;color:var(--text);border-radius:10px;padding:12px 13px;outline:none;transition:.15s ease;
}
textarea{resize:vertical;line-height:1.5}
textarea:focus,input:focus,select:focus{border-color:#3f7f59;box-shadow:0 0 0 3px rgba(40,215,104,.08)}
::placeholder{color:#607168}
.two-cols{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.switch-row{display:flex;align-items:center;gap:9px;margin:16px 0;color:var(--muted);font-size:.85rem}
.switch-label{color:#d7e1dc;font-weight:600}
.switch-row input{width:auto;accent-color:var(--green)}
.primary-btn{width:100%;border:0;border-radius:10px;padding:12px 14px;background:linear-gradient(180deg,var(--green),var(--green-2));color:#04170b;font-weight:800;box-shadow:0 8px 24px rgba(40,215,104,.15)}
.primary-btn:hover{filter:brightness(1.05);transform:translateY(-1px)}
.secondary-btn{width:100%;margin-top:9px;color:#b7c6bf}
.output-head{display:flex;align-items:flex-start;justify-content:space-between;gap:18px;margin-bottom:14px}
.counter{font-variant-numeric:tabular-nums;color:var(--muted);font-size:.82rem;white-space:nowrap;padding:7px 9px;border:1px solid var(--line);border-radius:8px;background:#0d1410}
.counter.warn{color:#ffd166;border-color:#5c4d28}
.counter.limit{color:var(--danger);border-color:#5f2f2f}
.output-box{min-height:390px;background:#0a100d;font-family:"SFMono-Regular",Consolas,"Liberation Mono",monospace;font-size:.92rem}
.action-row{display:flex;justify-content:flex-end;gap:9px;margin-top:12px;flex-wrap:wrap}
.ghost-btn{padding:10px 14px}
.ghost-btn.accent{border-color:#2e6c47;color:#bfffd5}
.lyrics-config{margin:16px 0 14px;padding:15px;border:1px solid var(--line);border-radius:12px;background:rgba(9,14,11,.45)}
.hidden{display:none!important}
footer{display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;color:#607168;font-size:.76rem;margin-top:15px;padding:0 4px}
@media (max-width:860px){
  .app-shell{width:min(100% - 20px,760px);padding-top:20px}
  .topbar{align-items:flex-start}
  .grid{grid-template-columns:1fr}
  .output-panel{min-height:0}
  .output-box{min-height:310px}
}
@media (max-width:520px){
  .topbar{flex-direction:column;align-items:stretch}
  .topbar>.ghost-btn{align-self:flex-start}
  .two-cols{grid-template-columns:1fr}
  .mode-tabs{gap:6px}
  .mode-tab{padding:10px 7px;font-size:.86rem}
  .output-head{flex-direction:column}
}


/* V0.2 — Lyrics Lab */
.lyrics-subtabs,.result-tabs{display:flex;gap:8px;margin:14px 0 18px;padding:4px;background:#0c1017;border:1px solid #242b38;border-radius:12px}
.lyrics-tab,.result-tab{flex:1;border:0;background:transparent;color:#8993a5;padding:10px 12px;border-radius:9px;font-weight:700;cursor:pointer}
.lyrics-tab.active,.result-tab.active{background:#202735;color:#fff}
.mini-title{margin:14px 0 8px;font-size:.76rem}.chips{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:16px}.chips label input{display:none}.chips span{display:block;padding:8px 10px;border:1px solid #30394a;border-radius:999px;color:#aab3c2;font-size:.8rem;cursor:pointer}.chips input:checked+span{border-color:#8c5cff;background:#251c3b;color:#fff}.check-row{display:flex;align-items:center;gap:9px;color:#aeb6c5;font-size:.84rem;margin:12px 0 16px}.check-row input{accent-color:#8c5cff}.range-scale{display:flex;justify-content:space-between;color:#687285;font-size:.72rem;margin-top:3px}.range-value{float:right;color:#b99cff;text-transform:none;letter-spacing:0}.changes-box{min-height:300px;border:1px solid #293142;background:#0d1118;border-radius:12px;padding:18px;color:#c4cad4;white-space:pre-wrap;line-height:1.6}.local-note{margin-top:14px;color:#697386;font-size:.74rem;line-height:1.5;border-top:1px solid #232a36;padding-top:12px}
@media(max-width:720px){.lyrics-subtabs,.result-tabs{flex-direction:column}.chips{gap:6px}}

/* V1.1 */
.utility-row{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:14px 0 4px}.text-btn{border:0;background:transparent;color:var(--green);padding:6px 0;font-weight:700}.text-btn:hover{text-decoration:underline}.preserve-chips{margin-top:10px}.preserve-chips span{border-color:var(--line);background:#0c130f}.preserve-chips input:checked+span{border-color:var(--green);background:var(--green-soft);color:#dffff0}