body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;margin:0;background-color:#0b1a3d;background-image:radial-gradient(circle at top,#00aaff26,#0b1a3dd9 60%,#0d1b2a),url(https://images.unsplash.com/photo-1542751371-adc38448a05e?q=80&w=2560&auto=format&fit=crop);background-size:cover;background-position:center;background-attachment:fixed;color:#fff;min-height:100vh;display:flex;justify-content:center;align-items:center;padding:2rem}.auth-container{position:relative;width:100%;max-width:450px;padding:4rem 2.5rem 2.5rem;background-color:#0009;border:1px solid #00aaff;border-radius:10px;box-shadow:0 0 15px #00aaff80;text-align:center}.back-btn{position:absolute;top:15px;left:15px;padding:8px 15px;background-color:#c0392b;color:#fff;text-decoration:none;border-radius:5px;font-size:.9rem;font-weight:700;transition:background-color .3s,transform .2s;box-shadow:0 0 8px #dc3232b3}.back-btn:hover{background-color:#e74c3c;transform:scale(1.05)}.auth-container h1{font-size:2.2rem;margin-bottom:1.5rem;color:#0fa;text-shadow:0 0 8px #00ffaa}.auth-form .form-group{margin-bottom:1.5rem;text-align:left}.auth-form label{display:block;margin-bottom:.5rem;color:#ccc;font-weight:700}.auth-form input{width:100%;padding:.8rem;background-color:#ffffff1a;border:1px solid #555;border-radius:5px;color:#fff;font-size:1rem;box-sizing:border-box}.auth-form input:focus{outline:none;border-color:#0af;box-shadow:0 0 8px #00aaffb3}.auth-form .terms{font-size:.8rem;color:#aaa;text-align:left;margin-top:1rem}.auth-form .terms a{color:#0af;text-decoration:none}.auth-form .terms a:hover{text-decoration:underline}.submit-btn{width:100%;padding:.8rem 2rem;font-size:1.2rem;font-weight:700;color:gold;background:linear-gradient(145deg,#2a2a2a,#4b4b4b);text-decoration:none;border:1px solid gold;border-radius:8px;cursor:pointer;transition:transform .2s,box-shadow .3s,background .3s;box-shadow:0 0 8px #ffd700b3;margin-top:1rem}.submit-btn:hover{transform:translateY(-2px);background:linear-gradient(145deg,#3c3c3c,#5a5a5a);box-shadow:0 0 15px gold}.submit-btn:disabled{background:#555;cursor:not-allowed;color:#888;border-color:#888;box-shadow:none;transform:none}.auth-switch{margin-top:2rem;color:#ccc}.auth-switch a{color:#0af;font-weight:700;text-decoration:none}.google-signin-btn{width:100%;padding:.8rem 2rem;font-size:1.1rem;font-weight:700;color:#fff;background-color:#db4437;border:none;border-radius:8px;cursor:pointer;transition:background-color .3s,transform .2s;margin-top:1rem}.google-signin-btn:hover{background-color:#c23321;transform:translateY(-2px)}