*{margin:0;padding:0;box-sizing:border-box}body{font-family:'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;min-height:100vh;padding:20px}.container{border-radius:20px;box-shadow:0 20px 40px rgba(0,0,0,0.1);padding:40px;max-width:600px;width:100%;text-align:center;margin:0 auto}@media (min-width: 1200px){.container{max-width:1000px;padding:50px}}@media (min-width: 1400px){.container{max-width:1200px;padding:60px}}@media (min-width: 1600px){.container{max-width:1400px;padding:70px}}@media (min-width: 1920px){.container{max-width:1600px;padding:80px}}.btn{background:linear-gradient(45deg, #667eea, #764ba2);color:white;border:none;padding:15px 30px;border-radius:25px;cursor:pointer;text-decoration:none;font-size:1rem;font-weight:500;transition:all 0.3s ease;display:inline-block}.btn:hover{box-shadow:0 10px 20px rgba(102,126,234,0.3)}.btn-secondary{background:#6c757d}.btn-secondary:hover{background:#5a6268}.alert{background:#f8d7da;color:#721c24;padding:15px;border-radius:10px;margin-bottom:20px;border:1px solid #f5c6cb}@media (max-width: 768px){.container{padding:20px}}body{display:flex;align-items:center;justify-content:center}.logo{font-size:3rem;font-weight:bold;background:linear-gradient(45deg, #667eea, #764ba2);-webkit-background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:20px}.title{font-size:2.5rem;color:#333;margin-bottom:20px;font-weight:300}.subtitle{font-size:1.2rem;color:#666;margin-bottom:30px;line-height:1.6}.description{background:#f8f9fa;border-radius:15px;padding:30px;margin-bottom:40px;text-align:left}.description h3{color:#333;margin-bottom:15px;font-size:1.3rem}.description ul{list-style:none;padding:0}.description li{padding:8px 0;color:#555;position:relative;padding-left:25px}.description li::before{content:"✓";color:#667eea;font-weight:bold;position:absolute;left:0}.start-section{text-align:center;margin-bottom:20px}.info-section{text-align:center;margin-bottom:40px}.start-button{background:linear-gradient(135deg, #667eea 0%, #764ba2 100%);color:white;padding:20px 40px;border-radius:50px;text-decoration:none;font-size:1.3rem;font-weight:600;transition:all 0.3s ease;box-shadow:0 8px 25px rgba(102,126,234,0.3);border:none;cursor:pointer;display:inline-block;text-align:center;min-width:250px}.start-button:hover{transform:translateY(-5px);box-shadow:0 15px 35px rgba(102,126,234,0.4);color:white;text-decoration:none}.info-button{background:linear-gradient(135deg, #6c757d 0%, #495057 100%);color:white;padding:15px 30px;border-radius:50px;text-decoration:none;font-size:1.1rem;font-weight:600;transition:all 0.3s ease;box-shadow:0 5px 15px rgba(108,117,125,0.3);border:none;cursor:pointer;display:inline-block;text-align:center}.info-button:hover{transform:translateY(-3px);box-shadow:0 8px 25px rgba(108,117,125,0.4);color:white;text-decoration:none}.mode-description{background:#f8f9fa;border-radius:20px;padding:40px;margin-bottom:40px;text-align:center}.mode-description h3{color:#333;margin-bottom:20px;font-size:1.5rem}.mode-description p{color:#666;font-size:1.1rem;margin-bottom:30px;line-height:1.6}.mode-cards{display:grid;grid-template-columns:1fr 1fr;gap:2rem;margin-top:2rem}@media (max-width: 768px){.mode-cards{grid-template-columns:1fr;gap:1.5rem}}.mode-card{background:white;border-radius:15px;padding:2rem;box-shadow:0 5px 15px rgba(0,0,0,0.1);transition:all 0.3s ease;border:2px solid transparent}.mode-card:hover{transform:translateY(-5px);box-shadow:0 10px 25px rgba(0,0,0,0.15)}.mode-card.game-master-card{background:linear-gradient(135deg, #ff6b6b 0%, #ee5a24 100%);color:white;border-color:#ff6b6b}.mode-card.game-master-card .mode-icon{color:white}.mode-card.game-master-card h4{color:white}.mode-card.game-master-card p{color:rgba(255,255,255,0.9)}.mode-card.game-master-card ul li{color:rgba(255,255,255,0.9)}.mode-icon{font-size:3rem;margin-bottom:1rem;display:block}.mode-card h4{color:#333;margin-bottom:1rem;font-size:1.3rem}.mode-card p{color:#666;margin-bottom:1.5rem;line-height:1.5}.mode-card ul{list-style:none;padding:0;text-align:left}.mode-card li{margin-bottom:0.8rem;padding-left:1.5rem;position:relative;color:#666}.mode-card li::before{content:'';position:absolute;left:0;top:50%;transform:translateY(-50%);width:6px;height:6px;background:#667eea;border-radius:50%}.game-master-card li::before{background:rgba(255,255,255,0.8)}.game-master-description{background:linear-gradient(135deg, #667eea 0%, #764ba2 100%);color:white;border-radius:20px;padding:30px;margin-bottom:40px;text-align:left;position:relative;overflow:hidden}.game-master-description::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="75" cy="75" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="50" cy="10" r="0.5" fill="rgba(255,255,255,0.05)"/><circle cx="10" cy="60" r="0.5" fill="rgba(255,255,255,0.05)"/><circle cx="90" cy="40" r="0.5" fill="rgba(255,255,255,0.05)"/></pattern></defs><rect width="100" height="100" fill="url(/%23grain)"/></svg>');opacity:0.3;pointer-events:none}.game-master-description h3{color:white;margin-bottom:15px;font-size:1.5rem;text-shadow:0 2px 4px rgba(0,0,0,0.3)}.game-master-description p{color:rgba(255,255,255,0.9);margin-bottom:20px;line-height:1.6}.game-master-description ul{list-style:none;padding:0;margin:0}.game-master-description li{padding:8px 0;color:rgba(255,255,255,0.9);position:relative;padding-left:30px;font-size:1.1rem}.game-master-description li::before{content:"🎮";position:absolute;left:0;font-size:1.2rem}.features{display:grid;grid-template-columns:repeat(auto-fit, minmax(200px, 1fr));gap:20px;margin-top:30px}.feature{background:#f8f9fa;padding:20px;border-radius:10px;text-align:center}.feature-icon{font-size:2rem;margin-bottom:10px}.feature h4{color:#333;margin-bottom:10px}.feature p{color:#666;font-size:0.9rem}