:root{--bg-color:#050505;--text-color:#d0d0d0;--accent-color:#800}body,html{margin:0;padding:0;width:100%;height:100%;background-color:var(--bg-color);color:var(--text-color);font-family:'serif';overflow:hidden;display:flex;align-items:center;justify-content:center}#container{text-align:center;max-width:600px;padding:20px;transition:opacity 2s}h1{font-size:2rem;letter-spacing:.5rem;margin-bottom:2rem;color:var(--accent-color);text-shadow:0 0 10px rgba(136,0,0,0.5)}.warning{font-size:1.2rem;margin-bottom:3rem;line-height:1.6}#start-btn{background:transparent;color:var(--text-color);border:1px solid var(--text-color);padding:15px 40px;font-size:1.1rem;cursor:pointer;transition:all .5s}#start-btn:hover{background:var(--text-color);color:var(--bg-color);box-shadow:0 0 20px rgba(255,255,255,0.2)}#darkness{position:fixed;top:0;left:0;width:100%;height:100%;background:black;display:none;opacity:0;transition:opacity 5s;z-index:100;cursor:none}#heartbeat-visual{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:2px;height:2px;background:rgba(136,0,0,0.5);border-radius:50%;pointer-events:none}.pulse{animation:pulse-anim 1s infinite}@keyframes pulse-anim{0%{transform:translate(-50%,-50%) scale(1);opacity:.5}50%{transform:translate(-50%,-50%) scale(50);opacity:0}100%{transform:translate(-50%,-50%) scale(1);opacity:0}}#subtitles{position:fixed;bottom:10%;width:100%;text-align:center;font-size:1.5rem;color:rgba(255,255,255,0.1);pointer-events:none;z-index:101}