* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #1e40af 0%, #3b82f6 50%, #22c55e 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }

        .login-container {
            background: white;
            border-radius: 20px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
            overflow: hidden;
            width: 100%;
            max-width: 400px;
            position: relative;
        }

        .login-header {
            background: linear-gradient(135deg, #1e40af, #3b82f6);
            padding: 40px 30px 30px;
            text-align: center;
            color: white;
            position: relative;
        }

        .logo {
            width: 120px;
            height: auto;
            margin-bottom: 20px;
            filter: brightness(0) invert(1);
        }

        .login-header h1 {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .login-header p {
            opacity: 0.9;
            font-size: 16px;
        }

        .bike-decoration {
            position: absolute;
            top: -10px;
            right: -10px;
            width: 60px;
            height: 60px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
        }

        .login-form {
            padding: 40px 30px;
        }

        .form-group {
            margin-bottom: 25px;
            position: relative;
        }

        .form-group label {
            display: block;
            margin-bottom: 8px;
            color: #374151;
            font-weight: 600;
            font-size: 14px;
        }

        .form-group input {
            width: 100%;
            padding: 15px 20px;
            border: 2px solid #e5e7eb;
            border-radius: 12px;
            font-size: 16px;
            transition: all 0.3s ease;
            background: #f9fafb;
        }

        .form-group input:focus {
            outline: none;
            border-color: #3b82f6;
            background: white;
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
        }

        .form-group input::placeholder {
            color: #9ca3af;
        }

        .login-btn {
            width: 100%;
            padding: 15px;
            background: linear-gradient(135deg, #1e40af, #3b82f6);
            color: white;
            border: none;
            border-radius: 12px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .login-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(59, 130, 246, 0.3);
        }

        .login-btn:active {
            transform: translateY(0);
        }

        .welcome-screen {
            display: none;
            text-align: center;
            padding: 60px 30px;
            background: linear-gradient(135deg, #22c55e, #16a34a);
            color: white;
            min-height: 400px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
        }

        .welcome-screen.show {
            display: flex;
        }

        .welcome-logo {
            width: 100px;
            height: auto;
            margin-bottom: 30px;
            filter: brightness(0) invert(1);
        }

        .welcome-screen h2 {
            font-size: 32px;
            margin-bottom: 15px;
            font-weight: 700;
        }

        .welcome-screen p {
            font-size: 18px;
            opacity: 0.9;
            margin-bottom: 30px;
        }

        .bike-icon {
            font-size: 48px;
            margin-bottom: 20px;
            animation: bounce 2s infinite;
        }

        @keyframes bounce {
            0%, 20%, 50%, 80%, 100% {
                transform: translateY(0);
            }
            40% {
                transform: translateY(-10px);
            }
            60% {
                transform: translateY(-5px);
            }
        }

        .logout-btn {
            background: rgba(255, 255, 255, 0.2);
            color: white;
            border: 2px solid rgba(255, 255, 255, 0.3);
            padding: 12px 24px;
            border-radius: 8px;
            cursor: pointer;
            font-size: 14px;
            transition: all 0.3s ease;
        }

        .logout-btn:hover {
            background: rgba(255, 255, 255, 0.3);
            border-color: rgba(255, 255, 255, 0.5);
        }

        .error-message {
            color: #ef4444;
            font-size: 14px;
            margin-top: 10px;
            display: none;
        }

        @media (max-width: 480px) {
            .login-container {
                margin: 10px;
            }
            
            .login-header {
                padding: 30px 20px 20px;
            }
            
            .login-form {
                padding: 30px 20px;
            }
            
            .logo {
                width: 100px;
            }
        }