:root{--bg: #000;--panel: rgba(14, 14, 16, .82);--line: rgba(255, 255, 255, .12);--ink: #f2f2f4;--muted: #9a9aa2;--accent: #ff3b30}*{box-sizing:border-box}html,body{margin:0;height:100%;background:var(--bg);color:var(--ink);font-family:ui-monospace,SF Mono,Menlo,Consolas,monospace;overflow:hidden}#stage{position:fixed;top:0;right:0;bottom:0;left:0;display:block}#ui{position:fixed;top:20px;left:20px;width:290px;max-height:calc(100vh - 40px);overflow-y:auto;padding:22px;background:var(--panel);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--line);border-radius:14px;transition:opacity .2s ease,transform .2s ease;z-index:10}#ui.hidden{opacity:0;transform:translate(-110%);pointer-events:none}header h1{margin:0;font-size:22px;letter-spacing:1px;font-weight:700}header h1 span{color:var(--accent)}.sub{margin:4px 0 14px;font-size:11px;color:var(--muted)}.yt-row{display:flex;gap:6px;margin-bottom:8px}.yt-row input{flex:1;min-width:0;font:inherit;font-size:11px;color:var(--ink);background:#ffffff0f;border:1px solid var(--line);border-radius:8px;padding:7px 10px}.yt-row input::placeholder{color:var(--muted)}.yt-row input:focus{outline:none;border-color:var(--accent)}.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff;white-space:nowrap}.btn.primary:hover{background:#ff5247}.btn.active{border-color:var(--accent);color:var(--accent)}.source-row{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:14px}.btn{-webkit-appearance:none;-moz-appearance:none;appearance:none;cursor:pointer;font:inherit;font-size:11px;color:var(--ink);background:#ffffff0f;border:1px solid var(--line);border-radius:8px;padding:7px 10px;transition:background .15s ease,border-color .15s ease}.btn:hover{background:#ffffff1f;border-color:#ffffff4d}.controls{display:flex;flex-direction:column;gap:12px;padding:14px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.ctrl{display:flex;flex-direction:column;gap:6px;font-size:11px;color:var(--muted)}.ctrl-top{display:flex;justify-content:space-between}.ctrl .val{color:var(--ink)}.ctrl input[type=range]{width:100%;accent-color:var(--accent)}.ctrl select{font:inherit;font-size:11px;color:var(--ink);background:#ffffff0f;border:1px solid var(--line);border-radius:8px;padding:6px 8px}.ctrl-toggle{flex-direction:row;align-items:center;gap:8px}.ctrl-toggle input{accent-color:var(--accent)}.actions{display:flex;gap:6px;margin:14px 0}footer{display:flex;flex-direction:column;gap:6px;font-size:10px;color:var(--muted)}footer a{color:var(--muted)}.credit{opacity:.7}#drop-hint{position:fixed;top:0;right:0;bottom:0;left:0;display:none;align-items:center;justify-content:center;font-size:28px;letter-spacing:2px;color:var(--ink);background:#000000b3;border:3px dashed var(--accent);z-index:20;pointer-events:none}#drop-hint.show{display:flex}.flash{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);font-size:15px;letter-spacing:1px;color:var(--ink);background:#0000009e;padding:12px 18px;border-radius:10px;border:1px solid var(--line);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);opacity:0;pointer-events:none;transition:opacity .25s ease;z-index:30}.flash.show{opacity:1}