/* NEBULA VJ engine — UI chrome */
:root{
  --a:#00e5ff;          /* deck A accent (cyan) */
  --b:#ff2ec4;          /* deck B accent (magenta) */
  --bg:rgba(8,10,18,.82);
  --line:rgba(255,255,255,.09);
  --txt:#cfd6e4;
  --dim:#7d8598;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{width:100%;height:100%;overflow:hidden;background:#000;
  font-family:"Segoe UI",system-ui,-apple-system,sans-serif;color:var(--txt);
  -webkit-user-select:none;user-select:none}
#glcanvas{position:fixed;inset:0;width:100%;height:100%;display:block;cursor:crosshair}
.hidden{display:none!important}
body.idle{cursor:none}
body.idle #hud,body.idle #panel{opacity:0;pointer-events:none}
#hud,#panel{transition:opacity .5s}

/* ---------- start overlay ---------- */
#overlay{position:fixed;inset:0;z-index:50;display:flex;align-items:center;justify-content:center;
  background:radial-gradient(ellipse at 50% 40%,#101529 0%,#04050a 70%);}
.overlay-inner{text-align:center;max-width:520px;padding:24px}
#overlay h1{font-size:64px;letter-spacing:.35em;font-weight:200;color:#fff;
  text-shadow:0 0 30px var(--a),0 0 80px rgba(0,229,255,.4);margin-bottom:10px}
#overlay .tag{color:var(--dim);margin-bottom:40px;letter-spacing:.05em}
.big-btn{display:block;width:100%;margin:12px 0;padding:16px;font-size:15px;letter-spacing:.15em;
  background:linear-gradient(90deg,rgba(0,229,255,.15),rgba(255,46,196,.15));
  color:#fff;border:1px solid rgba(0,229,255,.5);border-radius:8px;cursor:pointer;transition:all .2s}
.big-btn:hover{box-shadow:0 0 25px rgba(0,229,255,.35);transform:translateY(-1px)}
.big-btn.ghost{background:transparent;border-color:var(--line);color:var(--dim);font-size:12px;padding:11px}
.big-btn.ghost:hover{color:var(--txt);box-shadow:none}
#overlay .note{margin-top:28px;font-size:11px;color:var(--dim)}

/* ---------- HUD ---------- */
#hud{position:fixed;top:14px;left:18px;z-index:20;display:flex;gap:10px;align-items:center;
  font-size:13px;letter-spacing:.12em;text-shadow:0 1px 4px #000}
.deck-a{color:var(--a)} .deck-b{color:var(--b)}
.hud-x{color:var(--dim)}
#hud-mode{color:var(--dim);font-size:11px}
#beat-dot{width:10px;height:10px;border-radius:50%;background:#333;transition:background .05s;
  box-shadow:0 0 0 rgba(255,255,255,0)}
#beat-dot.on{background:#fff;box-shadow:0 0 14px #fff}

/* ---------- panel ---------- */
#panel{position:fixed;top:0;right:0;z-index:30;width:290px;height:100%;overflow-y:auto;
  background:var(--bg);backdrop-filter:blur(14px);border-left:1px solid var(--line);
  padding:14px 16px 20px;font-size:12px}
#panel::-webkit-scrollbar{width:5px}
#panel::-webkit-scrollbar-thumb{background:rgba(255,255,255,.15);border-radius:3px}
.panel-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}
.logo{font-size:15px;letter-spacing:.3em;color:#fff}
.logo .thin{color:var(--dim);font-weight:300;letter-spacing:.1em}
#btn-collapse{background:none;border:none;color:var(--dim);font-size:15px;cursor:pointer}
#btn-collapse:hover{color:#fff}
.section{margin-bottom:16px;padding-top:12px;border-top:1px solid var(--line)}
.sec-title{font-size:10px;letter-spacing:.25em;color:var(--dim);margin-bottom:8px}
.sec-title.deck-a{color:var(--a)} .sec-title.deck-b{color:var(--b)}

.engine-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:4px}
.engine-grid button{padding:7px 2px;font-size:9.5px;line-height:1.15;letter-spacing:.02em;
  background:rgba(255,255,255,.04);border:1px solid var(--line);border-radius:4px;
  color:var(--dim);cursor:pointer;transition:all .15s;overflow:hidden}
.engine-grid button:hover{color:#fff;background:rgba(255,255,255,.09)}
#deck-a button.active{color:#001318;background:var(--a);border-color:var(--a);
  box-shadow:0 0 12px rgba(0,229,255,.5);font-weight:600}
#deck-b button.active{color:#1a0013;background:var(--b);border-color:var(--b);
  box-shadow:0 0 12px rgba(255,46,196,.5);font-weight:600}

.fader-row{display:flex;align-items:center;gap:8px;margin-bottom:8px;font-weight:700}
.row{display:flex;align-items:center;gap:8px;margin:7px 0}
.row label{width:56px;color:var(--dim);flex-shrink:0}
.row .val{width:38px;text-align:right;color:var(--txt);flex-shrink:0}
.btn-row{display:flex;gap:6px;margin-top:8px}
.btn-row button,#btn-fullscreen{flex:1;padding:8px;font-size:10px;letter-spacing:.12em;
  background:rgba(255,255,255,.05);border:1px solid var(--line);border-radius:4px;
  color:var(--txt);cursor:pointer;transition:all .15s}
.btn-row button:hover,#btn-fullscreen:hover{background:rgba(255,255,255,.12);color:#fff}
.status{flex:1;color:var(--dim);font-size:11px}
.status.ok{color:#3dffa0}.status.warn{color:#ffb03d}

input[type=range]{flex:1;-webkit-appearance:none;appearance:none;height:4px;border-radius:2px;
  background:linear-gradient(90deg,var(--a),var(--b));outline:none;cursor:pointer}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:14px;height:14px;border-radius:50%;
  background:#fff;box-shadow:0 0 8px rgba(255,255,255,.6);cursor:pointer}
input[type=range]::-moz-range-thumb{width:14px;height:14px;border-radius:50%;background:#fff;border:none;cursor:pointer}
#crossfader{height:8px}
select{background:#12162a;color:var(--txt);border:1px solid var(--line);border-radius:4px;
  padding:5px;font-size:11px;flex:1;outline:none;cursor:pointer}

.switch{position:relative;width:34px;height:18px;flex-shrink:0}
.switch input{opacity:0;width:0;height:0}
.slider-sw{position:absolute;inset:0;background:#2a2f42;border-radius:10px;transition:.2s;cursor:pointer}
.slider-sw:before{content:"";position:absolute;width:12px;height:12px;left:3px;top:3px;border-radius:50%;
  background:#8a90a5;transition:.2s}
.switch input:checked+.slider-sw{background:rgba(0,229,255,.35)}
.switch input:checked+.slider-sw:before{transform:translateX(16px);background:var(--a);box-shadow:0 0 8px var(--a)}

.hint{margin-top:6px;padding-top:10px;border-top:1px solid var(--line);color:var(--dim);
  font-size:10px;line-height:1.7}
.hint b{color:var(--txt)}

#err{position:fixed;bottom:12px;left:12px;z-index:60;max-width:60%;padding:10px 14px;
  background:rgba(120,10,20,.9);border:1px solid #ff5060;border-radius:6px;
  font:11px/1.5 monospace;color:#ffd0d5;white-space:pre-wrap}

/* re-open tab when panel is collapsed */
#panel-tab{position:fixed;top:14px;right:14px;z-index:29;padding:8px 12px;font-size:11px;
  letter-spacing:.15em;background:var(--bg);border:1px solid var(--line);border-radius:6px;
  color:var(--dim);cursor:pointer;backdrop-filter:blur(10px)}
#panel-tab:hover{color:#fff}