:root{font-family:Inter,Segoe UI,Roboto,sans-serif;line-height:1.5;font-weight:400;color-scheme:dark;color:#e2e8f0;background:linear-gradient(135deg,#0f172a,#1e293b,#334155);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}#root{width:100%;min-height:100vh;display:flex;align-items:center;justify-content:center;margin:0;padding:0}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}body{margin:0;padding:0;display:flex;align-items:center;justify-content:center;min-width:320px;min-height:100vh;background:linear-gradient(135deg,#0f172a,#1e293b,#334155);position:relative;overflow-x:hidden;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;width:100%}body:before{content:"";position:fixed;top:0;left:0;width:100%;height:100%;background:radial-gradient(circle at 20% 80%,rgba(120,119,198,.1) 0%,transparent 50%),radial-gradient(circle at 80% 20%,rgba(255,119,198,.1) 0%,transparent 50%),radial-gradient(circle at 40% 40%,rgba(120,200,255,.05) 0%,transparent 50%);pointer-events:none;z-index:-1}h1{font-size:3.2em;line-height:1.1;background:linear-gradient(135deg,#64748b,#94a3b8,#cbd5e1);background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent;text-shadow:0 0 30px rgba(148,163,184,.3);font-weight:700;letter-spacing:-.02em}button{border-radius:12px;border:1px solid rgba(148,163,184,.2);padding:.8em 1.5em;font-size:1em;font-weight:500;font-family:inherit;background:linear-gradient(135deg,#334155,#475569);color:#e2e8f0;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 12px #0000004d}button:hover{border-color:#94a3b8;background:linear-gradient(135deg,#475569,#64748b);transform:translateY(-2px);box-shadow:0 6px 20px #0006}button:focus,button:focus-visible{outline:2px solid #94a3b8;outline-offset:2px}@media (prefers-color-scheme: light){:root{color:#213547;background-color:#fff}a:hover{color:#747bff}button{background-color:#f9f9f9}}.app{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:2rem;text-align:center;max-width:1400px;width:100%;box-sizing:border-box;position:relative}.title{font-size:clamp(2.5rem,8vw,5rem);font-weight:800;margin-bottom:clamp(2rem,5vw,4rem);background:linear-gradient(135deg,#64748b,#94a3b8,#cbd5e1,#f1f5f9);background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent;text-shadow:0 0 40px rgba(148,163,184,.4);letter-spacing:-.03em;position:relative;animation:titleGlow 3s ease-in-out infinite alternate;line-height:1.1}@keyframes titleGlow{0%{filter:brightness(.9)}to{filter:brightness(1.1)}}.video-container{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:clamp(1.5rem,4vw,3rem);width:100%;max-width:1200px;padding:0 1rem;margin:0 auto}.video-wrapper{position:relative;border-radius:clamp(15px,3vw,25px);overflow:hidden;box-shadow:0 20px 60px #0006,0 0 0 1px #94a3b81a;background:#1e293b80;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);transition:all .3s ease;width:100%;aspect-ratio:16/9;max-width:1000px;margin:0 auto}.video-wrapper:hover{transform:translateY(-5px);box-shadow:0 30px 80px #00000080,0 0 0 1px #94a3b833}.youtube-iframe{border-radius:clamp(15px,3vw,25px);width:100%;height:100%;border:none}.controls{display:flex;align-items:center;gap:clamp(1rem,3vw,2rem);padding:clamp(1rem,3vw,1.5rem) clamp(1.5rem,4vw,2rem);background:#1e293b4d;border-radius:clamp(12px,2vw,18px);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(148,163,184,.1);width:100%;max-width:600px;justify-content:space-between;flex-wrap:wrap;margin:0 auto}.nav-button{background:linear-gradient(135deg,#475569,#64748b);border:1px solid rgba(148,163,184,.2);color:#e2e8f0;padding:clamp(.6rem,2vw,.8rem) clamp(1rem,3vw,1.5rem);border-radius:clamp(8px,2vw,12px);font-weight:600;cursor:pointer;transition:all .3s ease;font-size:clamp(.9rem,2.5vw,1rem);box-shadow:0 4px 12px #0000004d;min-height:44px;display:flex;align-items:center;justify-content:center;flex:1;max-width:140px}.nav-button:hover{background:linear-gradient(135deg,#64748b,#94a3b8);border-color:#94a3b8;transform:translateY(-2px);box-shadow:0 6px 20px #0006}.nav-button:active{transform:translateY(0);box-shadow:0 2px 8px #0000004d}.video-counter{color:#cbd5e1;font-weight:600;font-size:clamp(1rem,2.5vw,1.1rem);padding:clamp(.4rem,2vw,.6rem) clamp(.8rem,3vw,1.2rem);background:#33415580;border-radius:clamp(6px,1.5vw,10px);border:1px solid rgba(148,163,184,.1);min-width:80px;text-align:center}.instructions{color:#94a3b8;font-size:clamp(.8rem,2vw,.9rem);font-weight:500;opacity:.8;margin-top:clamp(.5rem,2vw,1rem);padding:clamp(.6rem,2vw,.8rem) clamp(1rem,3vw,1.5rem);background:#1e293b33;border-radius:clamp(8px,2vw,12px);border:1px solid rgba(148,163,184,.1);text-align:center;max-width:500px;margin-left:auto;margin-right:auto}@media (max-width: 768px){.app{padding:1rem;min-height:100vh}.video-container{gap:1.5rem;padding:0 .5rem}.controls{flex-direction:column;gap:1rem;padding:1rem;max-width:100%}.nav-button{width:100%;max-width:none;min-height:48px}.video-counter{order:-1}}@media (min-width: 769px) and (max-width: 1024px){.app{padding:1.5rem}.video-container{max-width:900px}.controls{max-width:500px}}@media (min-width: 1400px){.app{padding:3rem}.title{font-size:5.5rem;margin-bottom:4rem}.video-container{max-width:1300px}.video-wrapper{max-width:1200px}}@media (hover: none) and (pointer: coarse){.nav-button:hover{transform:none;background:linear-gradient(135deg,#475569,#64748b)}.video-wrapper:hover{transform:none}.nav-button:active{background:linear-gradient(135deg,#64748b,#94a3b8);transform:scale(.98)}}@media (-webkit-min-device-pixel-ratio: 2),(min-resolution: 192dpi){.youtube-iframe{image-rendering:-webkit-optimize-contrast;image-rendering:crisp-edges}}*{box-sizing:border-box}